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Gogami T, Achenbach P, Akiyama T, Androic D, Asaturyan A, Brash E, Bukhari MH, Camsonne A, Covrig Dusa S, Ebata K, Elaasar MA, Fujii Y, Fujiwara T, Furic M, Garibaldi F, Gueye P, Higinbotham DW, Ishige T, Itabashi K, Kaneta M, Kino R, Lashley N, Markowitz P, Meekins D, Mizuno M, Mkrtchyan HG, Mkrtchyan AH, Nagafusa S, Nagano S, Nagao S, Nakamura SN, Nakamura YR, Niculescu G, Niculescu I, Okuyama K, Pandey B, Pochodzalla J, Reinhold J, Rodriguez VM, Samanta C, Sawatzky B, Shabestari MH, Shahinyan A, Sirca S, Suzuki KN, Tachibana K, Tang L, Toyama Y, Tsutsumi K, Uehara K, Umezaki E, Urciuoli GM, Watanabe D, Wood SA. High accuracy spectroscopy of 3- and 4-body Λ hypernuclei at Jefferson Lab. EPJ Web Conf 2022. [DOI: 10.1051/epjconf/202227101001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
JLab E12-19-002 Experiment is planned to measure the Λ-binding energies of 3ΛH [Jπ = 1/2+ or 3/2+(T = 0)] and 4ΛH (1+) at JLab Hall C. The expected accuracy for the binding-energy measurement is |ΔBtotal Λ | ≃ 70 keV. The accurate spectroscopy for these light hypernuclei would shed light on the puzzle of the small binding energy and short lifetime of 3ΛH, and the chargesymmetry breaking in the ΛN interaction. We aim to perform the experiment in 2025.
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2
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Gogami T, Suzuki KN, Pandey B, Itabashi K, Nagao S, Okuyama K, Nakamura SN, Tang L, Abrams D, Akiyama T, Androic D, Aniol K, Ayerbe Gayoso C, Bane J, Barcus S, Barrow J, Bellini V, Bhatt H, Bhetuwal D, Biswas D, Camsonne A, Castellanos J, Chen JP, Chen J, Covrig S, Chrisman D, Cruz-Torres R, Das R, Fuchey E, Gnanvo K, Garibaldi F, Gautam T, Gomez J, Gueye P, Hague TJ, Hansen O, Henry W, Hauenstein F, Higinbotham DW, Hyde CE, Kaneta M, Keppel C, Kutz T, Lashley-Colthirst N, Li S, Liu H, Mammei J, Markowitz P, McClellan RE, Meddi F, Meekins D, Michaels R, Mihovilovic M, Moyer A, Nguyen D, Nycz M, Owen V, Palatchi C, Park S, Petkovic T, Premathilake S, Reimer PE, Reinhold J, Riordan S, Rodriguez V, Samanta C, Santiesteban SN, Sawatzky B, Širca S, Slifer K, Su T, Tian Y, Toyama Y, Uehara K, Urciuoli GM, Votaw D, Williamson J, Wojtsekhowski B, Wood SA, Yale B, Ye Z, Zhang J, Zheng X. Cross-section measurement of virtual photoproduction of iso-triplet three-body hypernucleus, Λ nn. EPJ Web Conf 2022. [DOI: 10.1051/epjconf/202227102002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Missing-mass spectroscopy with the 3H(e, e′K+) reaction was carried out at Jefferson Lab’s (JLab) Hall A in Oct–Nov, 2018. The differential cross section for the 3H(γ∗, K+)Λnn was deduced at ω = Ee − Ee′ = 2.102 GeV and at the forward K+-scattering angle (0° ≤ θγ∗K ≤ 5°) in the laboratory frame. Given typical predicted energies and decay widths, which are (BΛ, Γ) = (−0.25, 0.8) and (−0.55, 4.7) MeV, the cross sections were found to be 11.2 ± 4.8(stat.)+4.1−2.1(sys.) and 18.1 ± 6.8(stat.)+4.2−2.9(sys.) nb/sr, respectively. The obtained result would impose a constraint for interaction models particularly between Λ and neutron by comparing to theoretical calculations.
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3
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Okuyama K, Itabashi K, Nagao S, Nakamura SN, Suzuki KN, Gogami T, Pandey B, Tang L, Abrams D, Akiyama T, Androic D, Aniol K, Ayerbe Gayoso C, Bane J, Barcus S, Barrow J, Bellini V, Bhatt H, Bhetuwal D, Biswas D, Camsonne A, Castellanos J, Chen JP, Chen J, Covrig S, Chrisman D, Cruz-Torres R, Das R, Fuchey E, Gnanvo K, Garibaldi F, Gautam T, Gomez J, Gueye P, Hague TJ, Hansen O, Henry W, Hauenstein F, Higinbotham DW, Hyde CE, Kaneta M, Keppel C, Kutz T, Lashley-Colthirst N, Li S, Liu H, Mammei J, Markowitz P, McClellan RE, Meddi F, Meekins D, Michaels R, Mihovilovic M, Moyer A, Nguyen D, Nycz M, Owen V, Palatchi C, Park S, Petkovic T, Premathilake S, Reimer PE, Reinhold J, Riordan S, Rodriguez V, Samanta C, Santiesteban SN, Sawatzky B, Širca S, Slifer K, Su T, Tian Y, Toyama Y, Uehara K, Urciuoli GM, Votaw D, Williamson J, Wojtsekhowski B, Wood SA, Yale B, Ye Z, Zhang J, Zheng X. Study of the Λ/Σ 0 electroproduction in the low- Q2 region at JLab. EPJ Web Conf 2022. [DOI: 10.1051/epjconf/202227102003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
We performed an experiment using tritium and hydrogen cryogenic gas targets at Thomas Jefferson National Accelerator Facility (JLab) in 2018 (E12-17-003)[1, 2]. In this article, we discuss the Λ/Σ0 hyperon electroproduction from hydrogen target. Elementary Λ/Σ0 hyperon production processes are important not only for an absolute mass scale calibration in our experiment, but also for the study of the electroproduction mechanisms themselves. In this article, we reported the results of the differential cross section for the p(e, e’K+)Λ/Σ0 reaction at Q2 ∼ 0.5 (GeV/c)2.
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Armstrong W, Kang H, Liyanage A, Maxwell J, Mulholland J, Ndukum L, Ahmidouch A, Albayrak I, Asaturyan A, Ates O, Baghdasaryan H, Boeglin W, Bosted P, Brash E, Butuceanu C, Bychkov M, Carter P, Chen C, Chen JP, Choi S, Christy ME, Covrig S, Crabb D, Danagoulian S, Daniel A, Davidenko AM, Davis B, Day D, Deconinck W, Deur A, Dunne J, Dutta D, El Fassi L, Ellis C, Ent R, Flay D, Frlez E, Gaskell D, Geagla O, German J, Gilman R, Gogami T, Gomez J, Goncharenko YM, Hashimoto O, Higinbotham D, Horn T, Huber GM, Jones M, Jones MK, Kalantarians N, Kang HK, Kawama D, Keith C, Keppel C, Khandaker M, Kim Y, King PM, Kohl M, Kovacs K, Kubarovsky V, Li Y, Liyanage N, Luo W, Mack D, Mamyan V, Markowitz P, Maruta T, Meekins D, Melnik YM, Meziani ZE, Mkrtchyan A, Mkrtchyan H, Mochalov VV, Monaghan P, Narayan A, Nakamura SN, Nuruzzaman A, Pentchev L, Pocanic D, Posik M, Puckett A, Qiu X, Reinhold J, Riordan S, Roche J, Rondón OA, Sawatzky B, Shabestari M, Slifer K, Smith G, Soloviev LF, Solvignon P, Tadevosyan V, Tang L, Vasiliev AN, Veilleux M, Walton T, Wesselmann F, Wood S, Yao H, Ye Z, Zhang J, Zhu L. Revealing Color Forces with Transverse Polarized Electron Scattering. Phys Rev Lett 2019; 122:022002. [PMID: 30720291 DOI: 10.1103/physrevlett.122.022002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Revised: 10/18/2018] [Indexed: 06/09/2023]
Abstract
The Spin Asymmetries of the Nucleon Experiment measured two double spin asymmetries using a polarized proton target and polarized electron beam at two beam energies, 4.7 and 5.9 GeV. A large-acceptance open-configuration detector package identified scattered electrons at 40° and covered a wide range in Bjorken x (0.3<x<0.8). Proportional to an average color Lorentz force, the twist-3 matrix element, d[over ˜]_{2}^{p}, was extracted from the measured asymmetries at Q^{2} values ranging from 2.0 to 6.0 GeV^{2}. The data display the opposite sign compared to most quark models, including the lattice QCD result, and an unexpected scale dependence. Furthermore, when combined with the neutron data in the same Q^{2} range the results suggest a flavor independent average color Lorentz force.
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Affiliation(s)
- W Armstrong
- Temple University, Philadelphia, Pennsylvania 19122, USA
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - H Kang
- Seoul National University, Seoul, South Korea
| | - A Liyanage
- Hampton University, Hampton, Virginia 23669, USA
| | - J Maxwell
- University of Virginia, Charlottesville, Virginia 22904, USA
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - J Mulholland
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - L Ndukum
- Mississippi State University, Starkville, Mississippi 39759, USA
| | - A Ahmidouch
- North Carolina A&M State University, Greensboro, North Carolina 27411, USA
| | - I Albayrak
- Hampton University, Hampton, Virginia 23669, USA
| | - A Asaturyan
- Yerevan Physics Institute, 0036, Yerevan, Armenia
| | - O Ates
- Hampton University, Hampton, Virginia 23669, USA
| | - H Baghdasaryan
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - W Boeglin
- Florida International University, Miami, Florida 33199, USA
| | - P Bosted
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - E Brash
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
- Christopher Newport University, Newport News, Virginia 23606, USA
| | - C Butuceanu
- University of Regina, Regina, Saskatchewan, S4S 0A2, Canada
| | - M Bychkov
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - P Carter
- Christopher Newport University, Newport News, Virginia 23606, USA
| | - C Chen
- Hampton University, Hampton, Virginia 23669, USA
| | - J-P Chen
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - S Choi
- Seoul National University, Seoul, South Korea
| | - M E Christy
- Hampton University, Hampton, Virginia 23669, USA
| | - S Covrig
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - D Crabb
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - S Danagoulian
- North Carolina A&M State University, Greensboro, North Carolina 27411, USA
| | - A Daniel
- Ohio University, Athens, Ohio 45701, USA
| | - A M Davidenko
- Kurchatov Institute-IHEP, Protvino, Moskva 123098, Russia
| | - B Davis
- North Carolina A&M State University, Greensboro, North Carolina 27411, USA
| | - D Day
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - W Deconinck
- William & Mary, Williamsburg, Virginia 23185, USA
| | - A Deur
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - J Dunne
- Mississippi State University, Starkville, Mississippi 39759, USA
| | - D Dutta
- Mississippi State University, Starkville, Mississippi 39759, USA
| | - L El Fassi
- Mississippi State University, Starkville, Mississippi 39759, USA
- Rutgers University, New Brunswick, New Jersey 08901, USA
| | - C Ellis
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - R Ent
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - D Flay
- Temple University, Philadelphia, Pennsylvania 19122, USA
| | - E Frlez
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - D Gaskell
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - O Geagla
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - J German
- North Carolina A&M State University, Greensboro, North Carolina 27411, USA
| | - R Gilman
- Rutgers University, New Brunswick, New Jersey 08901, USA
| | - T Gogami
- Tohoku University, Tohoku, Miyagi Prefecture 980-8577, Japan
| | - J Gomez
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | | | - O Hashimoto
- Tohoku University, Tohoku, Miyagi Prefecture 980-8577, Japan
| | - D Higinbotham
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - T Horn
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - G M Huber
- University of Regina, Regina, Saskatchewan, S4S 0A2, Canada
| | - M Jones
- North Carolina A&M State University, Greensboro, North Carolina 27411, USA
| | - M K Jones
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - N Kalantarians
- University of Virginia, Charlottesville, Virginia 22904, USA
- Virginia Union University, Richmond, Virginia 23220, USA
| | - H-K Kang
- Seoul National University, Seoul, South Korea
| | - D Kawama
- Tohoku University, Tohoku, Miyagi Prefecture 980-8577, Japan
| | - C Keith
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - C Keppel
- Hampton University, Hampton, Virginia 23669, USA
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - M Khandaker
- Norfolk State University, Norfolk, Virginia 23504, USA
| | - Y Kim
- Seoul National University, Seoul, South Korea
| | - P M King
- Ohio University, Athens, Ohio 45701, USA
| | - M Kohl
- Hampton University, Hampton, Virginia 23669, USA
| | - K Kovacs
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - V Kubarovsky
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
- Rensselaer Polytechnic Institute, Troy, New York 12180, USA
| | - Y Li
- Hampton University, Hampton, Virginia 23669, USA
| | - N Liyanage
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - W Luo
- Lanzhou University, Lanzhou, Gansu Sheng, China
| | - D Mack
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - V Mamyan
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - P Markowitz
- Florida International University, Miami, Florida 33199, USA
| | - T Maruta
- Tohoku University, Tohoku, Miyagi Prefecture 980-8577, Japan
| | - D Meekins
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - Y M Melnik
- Kurchatov Institute-IHEP, Protvino, Moskva 123098, Russia
| | - Z-E Meziani
- Temple University, Philadelphia, Pennsylvania 19122, USA
| | - A Mkrtchyan
- Yerevan Physics Institute, 0036, Yerevan, Armenia
| | - H Mkrtchyan
- Yerevan Physics Institute, 0036, Yerevan, Armenia
| | - V V Mochalov
- Kurchatov Institute-IHEP, Protvino, Moskva 123098, Russia
| | - P Monaghan
- Hampton University, Hampton, Virginia 23669, USA
| | - A Narayan
- Mississippi State University, Starkville, Mississippi 39759, USA
| | - S N Nakamura
- Tohoku University, Tohoku, Miyagi Prefecture 980-8577, Japan
| | - A Nuruzzaman
- Mississippi State University, Starkville, Mississippi 39759, USA
| | - L Pentchev
- William & Mary, Williamsburg, Virginia 23185, USA
| | - D Pocanic
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - M Posik
- Temple University, Philadelphia, Pennsylvania 19122, USA
| | - A Puckett
- University of Connecticut, Storrs, Connecticut 06269, USA
| | - X Qiu
- Hampton University, Hampton, Virginia 23669, USA
| | - J Reinhold
- Florida International University, Miami, Florida 33199, USA
| | - S Riordan
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - J Roche
- Ohio University, Athens, Ohio 45701, USA
| | - O A Rondón
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - B Sawatzky
- Temple University, Philadelphia, Pennsylvania 19122, USA
| | - M Shabestari
- University of Virginia, Charlottesville, Virginia 22904, USA
- Mississippi State University, Starkville, Mississippi 39759, USA
| | - K Slifer
- University of New Hampshire, Durham, New Hampshire 03824, USA
| | - G Smith
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - L F Soloviev
- Kurchatov Institute-IHEP, Protvino, Moskva 123098, Russia
| | - P Solvignon
- Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - V Tadevosyan
- Yerevan Physics Institute, 0036, Yerevan, Armenia
| | - L Tang
- Hampton University, Hampton, Virginia 23669, USA
| | - A N Vasiliev
- Kurchatov Institute-IHEP, Protvino, Moskva 123098, Russia
| | - M Veilleux
- Christopher Newport University, Newport News, Virginia 23606, USA
| | - T Walton
- Hampton University, Hampton, Virginia 23669, USA
| | - F Wesselmann
- Xavier University, New Orleans, Louisiana 70125, USA
| | - S Wood
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - H Yao
- Temple University, Philadelphia, Pennsylvania 19122, USA
| | - Z Ye
- Hampton University, Hampton, Virginia 23669, USA
| | - J Zhang
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - L Zhu
- Hampton University, Hampton, Virginia 23669, USA
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Achenbach P, Schulz F, Aulenbacher S, Beričič J, Bleser S, Böhm R, Bosnar D, Correa L, Distler MO, Esser A, Fonvieille H, Friščić I, Fujii Y, Fujita M, Gogami T, Kanda H, Kaneta M, Kegel S, Kohl Y, Kusaka W, Margaryan A, Merkel H, Mihovilovič M, Müller U, Nagao S, Nakamura SN, Pochodzalla J, Lorente AS, Schlimme BS, Schoth M, Sfienti C, Širca S, Steinen M, Takahashi Y, Tang L, Thiel M, Tsukada K, Tyukin A, Weber A. Experimental investigations of the hypernucleus Λ4H. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201611307001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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6
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Nakamura SN, Matsumura A, Okayasu Y, Seva T, Rodriguez VM, Baturin P, Yuan L, Acha A, Ahmidouch A, Androic D, Asaturyan A, Asaturyan R, Baker OK, Benmokhtar F, Bosted P, Carlini R, Chen C, Christy M, Cole L, Danagoulian S, Daniel A, Dharmawardane V, Egiyan K, Elaasar M, Ent R, Fenker H, Fujii Y, Furic M, Gan L, Gaskell D, Gasparian A, Gibson EF, Gogami T, Gueye P, Han Y, Hashimoto O, Hiyama E, Honda D, Horn T, Hu B, Hungerford EV, Jayalath C, Jones M, Johnston K, Kalantarians N, Kanda H, Kaneta M, Kato F, Kato S, Kawama D, Keppel C, Lan KJ, Luo W, Mack D, Maeda K, Malace S, Margaryan A, Marikyan G, Markowitz P, Maruta T, Maruyama N, Miyoshi T, Mkrtchyan A, Mkrtchyan H, Nagao S, Navasardyan T, Niculescu G, Niculescu MI, Nomura H, Nonaka K, Ohtani A, Oyamada M, Perez N, Petkovic T, Randeniya S, Reinhold J, Roche J, Sato Y, Segbefia EK, Simicevic N, Smith G, Song Y, Sumihama M, Tadevosyan V, Takahashi T, Tang L, Tsukada K, Tvaskis V, Vulcan W, Wells S, Wood SA, Yan C, Zhamkochyan S. Observation of the (Λ)(7)He hypernucleus by the (e, e'K+) reaction. Phys Rev Lett 2013; 110:012502. [PMID: 23383783 DOI: 10.1103/physrevlett.110.012502] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Indexed: 06/01/2023]
Abstract
An experiment with a newly developed high-resolution kaon spectrometer and a scattered electron spectrometer with a novel configuration was performed in Hall C at Jefferson Lab. The ground state of a neutron-rich hypernucleus, (Λ)(7)He, was observed for the first time with the (e, e'K+) reaction with an energy resolution of ~0.6 MeV. This resolution is the best reported to date for hypernuclear reaction spectroscopy. The (Λ)(7)He binding energy supplies the last missing information of the A = 7, T = 1 hypernuclear isotriplet, providing a new input for the charge symmetry breaking effect of the ΛN potential.
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Affiliation(s)
- S N Nakamura
- Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
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7
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Sfienti C, Achenbach P, Ayerbe Gayoso C, Böhm R, Bosnar D, Debenjak L, Denig A, Distler MO, Esser A, Fonvieille H, Friščic I, Fujii Y, Gogami T, Mar Gòmez R, Hashimoto H, Hirose S, Merkel H, Middleton DG, Molitor M, Müller U, Nungesser L, Nagao S, Nakamura SN, Pochodzalla J, Saito T, Sànchez Majos S, Sanchez Lorente A, Schlimme BS, Schoth M, Schulz F, Širca S, Tang L, Thiel M, Tsukada K, Walcher T. The frontiers of the virtual photons program at MAMI. EPJ Web of Conferences 2012. [DOI: 10.1051/epjconf/20123701015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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8
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Achenbach P, Ayerbe Gayoso C, Böhm R, Borodina O, Bosnar D, Bydžovský P, Debenjak L, Distler M, Esser A, Friščić I, Fujii Y, Gogami T, Gómez Rodríguez M, Hashimoto O, Hirose S, Kim E, Margaryan A, Merkel H, Müller U, Nagao S, Nakamura SN, Pochodzalla J, Rappold C, Reinhold J, Saito TR, Sanchez Lorente A, Schlimme BS, Schoth M, Schulz F, Sfienti C, Širca S, Tang L, Thiel M, Tsukada K. Unpolarized and polarized elementary kaon electroproduction cross sections measured at MAMI. EPJ Web of Conferences 2012. [DOI: 10.1051/epjconf/20123706004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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9
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Kim M, Ajimura S, Aoki K, Banu A, Bhang H, Fukuda T, Hashimoto O, Hwang JI, Kameoka S, Kang BH, Kim E, Kim JH, Maruta T, Miura Y, Miyake Y, Nagae T, Nakamura M, Nakamura SN, Noumi H, Okada S, Okayasu Y, Outa H, Park H, Saha PK, Sato Y, Sekimoto M, Takahashi T, Tamura H, Tanida K, Toyoda A, Tshoo K, Tsukada K, Watanabe T, Yim HJ. Three-body nonmesonic weak decay of the (Lambda)12C hypernucleus. Phys Rev Lett 2009; 103:182502. [PMID: 19905801 DOI: 10.1103/physrevlett.103.182502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2009] [Indexed: 05/28/2023]
Abstract
We have measured the branching ratio of the three-body process in the nonmesonic weak decay of Lambda12C to be 0.29+/-0.13. This result was obtained by reproducing the nucleon and the nucleon pair yields introducing a measured final state interaction. At the same time, we have determined the absolute decay widths, Gamma(n) and Gamma(p), along with Gamma2N, whose relative ratio has been a long-standing puzzle. Including the three-body process, we have successfully reproduced the nucleon energy distribution, the coincidence two-nucleon angular correlation, and the momentum sum distribution simultaneously.
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Affiliation(s)
- M Kim
- Department of Physics and Astronomy, Seoul National University, Seoul, 151-747, Korea
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10
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Kang BH, Bhang H, Kim EH, Kim JH, Kim MJ, Yim HJ, Ajimura S, Miyake Y, Aoki K, Nagae T, Noumi H, Outa H, Saha PK, Sato Y, Sekimoto M, Toyoda A, Banu A, Fukuda T, Hashimoto O, Kameoka S, Miura Y, Nakamura SN, Okayasu Y, Takahashi T, Tamura H, Tsukada K, Watanabe T, Hwang JI, Maruta T, Nakamura M, Okada S, Park H, Tanida K. Exclusive measurement of the nonmesonic weak decay of the lambda(5)He hypernucleus. Phys Rev Lett 2006; 96:062301. [PMID: 16605985 DOI: 10.1103/physrevlett.96.062301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2005] [Indexed: 05/08/2023]
Abstract
We performed a coincidence measurement of two nucleons emitted from the nonmesonic weak decay of lambda(5)He formed via the 6Li(pi+, K+) reaction. The energies of the two nucleons and the pair number distributions in the opening angle between them were measured. In both np and nn pairs, we observed a clean back-to-back correlation coming from the two-body weak reactions of lambda p --> np and lambda n --> nn, respectively. The ratio of the nucleon pair numbers was N(nn)/N(np) = 0.45 +/- 0.11(stat) +/- 0.03(syst) in the kinematic region of cos theta(NN) < -0.8. Since each decay mode was exclusively detected, the measured ratio should be close to the ratio of gamma(lambda p --> np)/gamma(lambda n --> nn). The ratio is consistent with recent theoretical calculations based on the heavy meson and/or direct-quark exchange picture.
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Affiliation(s)
- B H Kang
- Department of Physics, Seoul National University, Seoul 151-742, Korea
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11
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Ukai M, Ajimura S, Akikawa H, Alburger DE, Banu A, Chrien RE, Franklin GB, Franz J, Hashimoto O, Hayakawa T, Hotchi H, Imai K, Kishimoto T, May M, Millener DJ, Minami S, Miura Y, Miyoshi T, Mizunuma K, Nagae T, Nakamura SN, Nakazawa K, Okayasu Y, Pile P, Quinn BP, Rusek A, Sato Y, Sutter R, Takahashi H, Tang L, Tamura H, Tanida K, Yuan L, Zhou SH. Hypernuclear fine structure in (16)(Lambda)O and the LambdaN tensor interaction. Phys Rev Lett 2004; 93:232501. [PMID: 15601150 DOI: 10.1103/physrevlett.93.232501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2004] [Indexed: 05/24/2023]
Abstract
We have observed two gamma-ray transitions in (16)(Lambda)O from the 6.6 MeV excited 1(-)(2) state to both ground-state spin-doublet members (1(-)(1),0(-)) by the (K-,pi(-)gamma) reaction. We have obtained the ground-state doublet spacing to be 26.4+/-1.6(stat)+/-0.5(syst) keV and the excitation energy of the 1(-)(2) state to be 6561.7+/-1.1(stat)+/-1.7(syst) keV. The ground-state doublet spacing provides a small but nonzero strength of the tensor interaction between a Lambda and a nucleon. This is the first experimental result on the LambdaN tensor interaction.
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Affiliation(s)
- M Ukai
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
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12
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Miyoshi T, Sarsour M, Yuan L, Zhu X, Ahmidouch A, Ambrozewicz P, Androic D, Angelescu T, Asaturyan R, Avery S, Baker OK, Bertovic I, Breuer H, Carlini R, Cha J, Chrien R, Christy M, Cole L, Danagoulian S, Dehnhard D, Elaasar M, Empl A, Ent R, Fenker H, Fujii Y, Furic M, Gan L, Garrow K, Gasparian A, Gueye P, Harvey M, Hashimoto O, Hinton W, Hu B, Hungerford E, Jackson C, Johnston K, Juengst H, Keppel C, Lan K, Liang Y, Likhachev VP, Liu JH, Mack D, Margaryan A, Markowitz P, Martoff J, Mkrtchyan H, Nakamura SN, Petkovic T, Reinhold J, Roche J, Sato Y, Sawafta R, Simicevic N, Smith G, Stepanyan S, Tadevosyan V, Takahashi T, Tanida K, Tang L, Ukai M, Uzzle A, Vulcan W, Wells S, Wood S, Xu G, Yamaguchi H, Yan C. High resolution spectroscopy of the 12Lambda B hypernucleus produced by the (e,e'K+) reaction. Phys Rev Lett 2003; 90:232502. [PMID: 12857252 DOI: 10.1103/physrevlett.90.232502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2002] [Indexed: 05/24/2023]
Abstract
High-energy, cw electron beams at new accelerator facilities allow electromagnetic production and precision study of hypernuclear structure, and we report here on the first experiment demonstrating the potential of the (e,e'K+) reaction for hypernuclear spectroscopy. This experiment is also the first to take advantage of the enhanced virtual photon flux available when electrons are scattered at approximately zero degrees. The observed energy resolution was found to be approximately 900 keV for the (12)(Lambda)B spectrum, and is substantially better than any previous hypernuclear experiment using magnetic spectrometers. The positions of the major excitations are found to be in agreement with a theoretical prediction and with a previous binding energy measurement, but additional structure is also observed in the core excited region, underlining the future promise of this technique.
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Affiliation(s)
- T Miyoshi
- Tohoku University, Sendai 980-8578, Japan
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13
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Kawamura N, Nagamine K, Matsuzaki T, Ishida K, Nakamura SN, Matsuda Y, Tanase M, Kato M, Sugai H, Kudo K, Takeda N, Eaton GH. Discovery of temperature-dependent phenomena of muon-catalyzed fusion in solid deuterium and tritium mixtures. Phys Rev Lett 2003; 90:043401. [PMID: 12570420 DOI: 10.1103/physrevlett.90.043401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2002] [Indexed: 05/24/2023]
Abstract
A systematic experimental study on muon-catalyzed fusion was conducted using a series of solid deuterium and tritium mixtures. A variety of conditions were investigated, i.e., tritium concentrations from 20% to 70%, and temperatures from 5 to 16 K. With decreasing temperature, we observed an unexpected decrease in the muon cycling rate (lambda(c)) and an increase in the muon loss probability (W). The origins of these observed changes were interpreted by the temperature-dependence in the dt mu formation process for lambda(c) and that in the muon reactivation process after muon-to-alpha sticking for W.
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Affiliation(s)
- N Kawamura
- Muon Science Laboratory, RIKEN, The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan
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14
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Widmann E, Sugai I, Yamazaki T, Hayano RS, Iwasaki M, Nakamura SN, Tamura H, Ito TM, Kawachi A, Nishida N, Higemoto W, Ito Y, Morita N, Hartmann FJ, Daniel H, Schmid W, Hoffmann J, Eades J. Effects of impurity atoms and molecules on the lifetime of antiprotonic helium atoms. Phys Rev A 1996; 53:3129-3139. [PMID: 9913253 DOI: 10.1103/physreva.53.3129] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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15
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Widmann E, Sugai I, Yamazaki T, Hayano RS, Iwasaki M, Nakamura SN, Tamura H, Ito TM, Kawachi A, Nishida N, Higemoto W, Ito Y, Morita N, Hartmann FJ, Daniel H, Schmid W, Hoffmann J, Eades J. Phase and density dependence of the delayed annihilation of metastable antiprotonic helium atoms in gas, liquid, and solid helium. Phys Rev A 1995; 51:2870-2880. [PMID: 9911919 DOI: 10.1103/physreva.51.2870] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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16
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Nakamura SN, Hayano RS, Iwasaki M, Shigaki K, Widmann E, Yamazaki T, Daniel H, Hartmann FJ, Hofmann P, Kim Y, Eades J. Delayed annihilation of antiprotons in helium gas. Phys Rev A 1994; 49:4457-4465. [PMID: 9910761 DOI: 10.1103/physreva.49.4457] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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17
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Nakamura SN, Iwasaki M, Outa H, Hayano RS, Watanabe Y, Nagae T, Yamazaki T, Tada H, Numao T, Kuno Y, Kadono R. Negative-pion trapping by a metastable state in liquid helium. Phys Rev A 1992; 45:6202-6208. [PMID: 9907739 DOI: 10.1103/physreva.45.6202] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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18
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Iwasaki M, Nakamura SN, Shigaki K, Shimizu Y, Tamura H, Ishikawa T, Hayano RS, Takada E, Widmann E, Outa H, Aoki M, Kitching P, Yamazaki T. Discovery of antiproton trapping by long-lived metastable states in liquid helium. Phys Rev Lett 1991; 67:1246-1249. [PMID: 10044097 DOI: 10.1103/physrevlett.67.1246] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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