1
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Byron W, Harrington H, Taylor RJ, DeGraw W, Buzinsky N, Dodson B, Fertl M, García A, Garvey G, Graner B, Guigue M, Hayen L, Huyan X, Khaw KS, Knutsen K, McClain D, Melconian D, Müller P, Novitski E, Oblath NS, Robertson RGH, Rybka G, Savard G, Smith E, Stancil DD, Sternberg M, Storm DW, Swanson HE, Tedeschi JR, VanDevender BA, Wietfeldt FE, Young AR, Zhu X. First Observation of Cyclotron Radiation from MeV-Scale e^{±} following Nuclear β Decay. PHYSICAL REVIEW LETTERS 2023; 131:082502. [PMID: 37683153 DOI: 10.1103/physrevlett.131.082502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 05/03/2023] [Accepted: 07/12/2023] [Indexed: 09/10/2023]
Abstract
We present an apparatus for detection of cyclotron radiation yielding a frequency-based β^{±} kinetic energy determination in the 5 keV to 2.1 MeV range, characteristic of nuclear β decays. The cyclotron frequency of the radiating β particles in a magnetic field is used to determine the β energy precisely. Our work establishes the foundation to apply the cyclotron radiation emission spectroscopy (CRES) technique, developed by the Project 8 Collaboration, far beyond the 18-keV tritium endpoint region. We report initial measurements of β^{-}'s from ^{6}He and β^{+}'s from ^{19}Ne decays to demonstrate the broadband response of our detection system and assess potential systematic uncertainties for β spectroscopy over the full (MeV) energy range. To our knowledge, this is the first direct observation of cyclotron radiation from individual highly relativistic β's in a waveguide. This work establishes the application of CRES to a variety of nuclei, opening its reach to searches for new physics beyond the TeV scale via precision β-decay measurements.
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Affiliation(s)
- W Byron
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - H Harrington
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - R J Taylor
- Physics Department, North Carolina State University, Raleigh, North Carolina 27695, USA
- The Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA
| | - W DeGraw
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - N Buzinsky
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - B Dodson
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - M Fertl
- Institute for Physics, Johannes-Gutenberg University Mainz, 55128 Mainz, Germany
| | - A García
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - G Garvey
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - B Graner
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - M Guigue
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - L Hayen
- Physics Department, North Carolina State University, Raleigh, North Carolina 27695, USA
- The Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA
| | - X Huyan
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - K S Khaw
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - K Knutsen
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - D McClain
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
- Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
| | - D Melconian
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
- Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
| | - P Müller
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
| | - E Novitski
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - N S Oblath
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - R G H Robertson
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - G Rybka
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - G Savard
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
| | - E Smith
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - D D Stancil
- Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA
| | - M Sternberg
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - D W Storm
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - H E Swanson
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
| | - J R Tedeschi
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - B A VanDevender
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - F E Wietfeldt
- Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA
| | - A R Young
- Physics Department, North Carolina State University, Raleigh, North Carolina 27695, USA
- The Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA
| | - X Zhu
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
- Center for Nuclear Physics and Astrophysics, University of Washington, Seattle, Washington 98195, USA
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2
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Seng CY. Model-Independent Determination of Nuclear Weak Form Factors and Implications for Standard Model Precision Tests. PHYSICAL REVIEW LETTERS 2023; 130:152501. [PMID: 37115885 DOI: 10.1103/physrevlett.130.152501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Accepted: 03/22/2023] [Indexed: 06/19/2023]
Abstract
We analyze the recoil corrections in superallowed beta decays of T=1, J^{P}=0^{+} nuclei by fixing the mean square charged weak radius model independently using the data of multiple charge radii across the nuclear isotriplet. By comparing to model estimations, we argue that the existing theory uncertainty in the statistical rate function f might have been substantially underestimated. We discuss the implications of our proposed strategy for precision tests of the standard model, including a potential alleviation of the first-row CKM unitarity deficit, and motivate new experiments for charge radii measurements.
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Affiliation(s)
- Chien-Yeah Seng
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
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3
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Cirigliano V, de Vries J, Hayen L, Mereghetti E, Walker-Loud A. Pion-Induced Radiative Corrections to Neutron β Decay. PHYSICAL REVIEW LETTERS 2022; 129:121801. [PMID: 36179200 DOI: 10.1103/physrevlett.129.121801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 06/10/2022] [Accepted: 08/03/2022] [Indexed: 06/16/2023]
Abstract
We compute the electromagnetic corrections to neutron β decay using a low-energy hadronic effective field theory. We identify new radiative corrections arising from virtual pions that were missed in previous studies. The largest correction is a percent-level shift in the axial charge of the nucleon proportional to the electromagnetic part of the pion-mass splitting. Smaller corrections, comparable to anticipated experimental precision, impact the β-ν angular correlations and the β asymmetry. We comment on implications of our results for the comparison of the experimentally measured nucleon axial charge with first-principles computations using lattice QCD and on the potential of β decay experiments to constrain beyond-the-standard-model interactions.
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Affiliation(s)
- Vincenzo Cirigliano
- Los Alamos National Laboratory, Theoretical Division T-2, Los Alamos, New Mexico 87545, USA
- Institute for Nuclear Theory, University of Washington, Seattle, Washington 98195-1550, USA
| | - Jordy de Vries
- Institute for Theoretical Physics Amsterdam and Delta Institute for Theoretical Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands
- Nikhef, Theory Group, Science Park 105, 1098 XG Amsterdam, Netherlands
| | - Leendert Hayen
- Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, USA
- Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA
| | - Emanuele Mereghetti
- Los Alamos National Laboratory, Theoretical Division T-2, Los Alamos, New Mexico 87545, USA
| | - André Walker-Loud
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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4
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Fenker B, Gorelov A, Melconian D, Behr JA, Anholm M, Ashery D, Behling RS, Cohen I, Craiciu I, Gwinner G, McNeil J, Mehlman M, Olchanski K, Shidling PD, Smale S, Warner CL. Precision Measurement of the β Asymmetry in Spin-Polarized ^{37}K Decay. PHYSICAL REVIEW LETTERS 2018; 120:062502. [PMID: 29481259 DOI: 10.1103/physrevlett.120.062502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 12/23/2017] [Indexed: 06/08/2023]
Abstract
Using Triumf's neutral atom trap, Trinat, for nuclear β decay, we have measured the β asymmetry with respect to the initial nuclear spin in ^{37}K to be A_{β}=-0.5707(13)_{syst}(13)_{stat}(5)_{pol}, a 0.3% measurement. This is the best relative accuracy of any β-asymmetry measurement in a nucleus or the neutron, and is in agreement with the standard model prediction -0.5706(7). We compare constraints on physics beyond the standard model with other β-decay measurements, and improve the value of V_{ud} measured in this mirror nucleus by a factor of 4.
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Affiliation(s)
- B Fenker
- Cyclotron Institute, Texas A&M University, 3366 TAMU, College Station, Texas 77843-3366, USA
- Department of Physics and Astronomy, Texas A&M University, 4242 TAMU, College Station, Texas 77843-4242, USA
| | - A Gorelov
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - D Melconian
- Cyclotron Institute, Texas A&M University, 3366 TAMU, College Station, Texas 77843-3366, USA
- Department of Physics and Astronomy, Texas A&M University, 4242 TAMU, College Station, Texas 77843-4242, USA
| | - J A Behr
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - M Anholm
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - D Ashery
- School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
| | - R S Behling
- Cyclotron Institute, Texas A&M University, 3366 TAMU, College Station, Texas 77843-3366, USA
- Department of Chemistry, Texas A&M University, 3012 TAMU, College Station, Texas 77843-3012, USA
| | - I Cohen
- School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
| | - I Craiciu
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - G Gwinner
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - J McNeil
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - M Mehlman
- Cyclotron Institute, Texas A&M University, 3366 TAMU, College Station, Texas 77843-3366, USA
- Department of Physics and Astronomy, Texas A&M University, 4242 TAMU, College Station, Texas 77843-4242, USA
| | - K Olchanski
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - P D Shidling
- Cyclotron Institute, Texas A&M University, 3366 TAMU, College Station, Texas 77843-3366, USA
| | - S Smale
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - C L Warner
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
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5
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Broussard LJ, Alarcon R, Baeßler S, Barrón Palos L, Birge N, Bode T, Bowman JD, Brunst T, Calarco JR, Caylor J, Chupp T, Cianciolo V, Crawford C, Dodson GW, DuBois J, Fan W, Farrar W, Fomin N, Frlež E, Fry J, Gericke MT, Glück F, Greene GL, Grzywacz RK, Gudkov V, Hendrus C, Hersman FW, Ito T, Li H, Macsai N, Makela MF, Mammei J, Mammei R, Martin J, Martinez M, McGaughey PL, Mertens S, Mirabal-Martinez J, Mueller P, Page SA, Penttilä SI, Picker R, Plaster B, Počanić D, Radford DC, Ramsey J, Rykaczewski KP, Salas-Bacci A, Scott EM, Sjue SKL, Smith A, Smith E, Sprow A, Stevens E, Wexler J, Whitehead R, Wilburn WS, Young AR, Zeck BA. Neutron decay correlations in the Nab experiment. ACTA ACUST UNITED AC 2017. [DOI: 10.1088/1742-6596/876/1/012005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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6
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Gulyuz K, Bollen G, Brodeur M, Bryce RA, Cooper K, Eibach M, Izzo C, Kwan E, Manukyan K, Morrissey DJ, Naviliat-Cuncic O, Redshaw M, Ringle R, Sandler R, Schwarz S, Sumithrarachchi CS, Valverde AA, Villari ACC. High Precision Determination of the β Decay Q(EC) Value of (11)C and Implications on the Tests of the Standard Model. PHYSICAL REVIEW LETTERS 2016; 116:012501. [PMID: 26799013 DOI: 10.1103/physrevlett.116.012501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Indexed: 06/05/2023]
Abstract
We report the determination of the Q(EC) value of the mirror transition of (11)C by measuring the atomic masses of (11)C and (11)B using Penning trap mass spectrometry. More than an order of magnitude improvement in precision is achieved as compared to the 2012 Atomic Mass Evaluation (Ame2012) [Chin. Phys. C 36, 1603 (2012)]. This leads to a factor of 3 improvement in the calculated Ft value. Using the new value, Q(EC)=1981.690(61) keV, the uncertainty on Ft is no longer dominated by the uncertainty on the Q(EC) value. Based on this measurement, we provide an updated estimate of the Gamow-Teller to Fermi mixing ratio and standard model values of the correlation coefficients.
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Affiliation(s)
- K Gulyuz
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - G Bollen
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
- Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
| | - M Brodeur
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - R A Bryce
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - K Cooper
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Eibach
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - C Izzo
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - E Kwan
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - K Manukyan
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - D J Morrissey
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - O Naviliat-Cuncic
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Redshaw
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - R Ringle
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - R Sandler
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Schwarz
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - C S Sumithrarachchi
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
| | - A A Valverde
- National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - A C C Villari
- Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
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7
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Cornejo JM, Colombano M, Doménech J, Block M, Delahaye P, Rodríguez D. Extending the applicability of an open-ring trap to perform experiments with a single laser-cooled ion. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2015; 86:103104. [PMID: 26520937 DOI: 10.1063/1.4932310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A special ion trap was initially built up to perform β-ν correlation experiments with radioactive ions. The trap geometry is also well suited to perform experiments with laser-cooled ions, serving for the development of a new type of Penning trap, in the framework of the project TRAPSENSOR at the University of Granada. The goal of this project is to use a single (40)Ca(+) ion as detector for single-ion mass spectrometry. Within this project and without any modification to the initial electrode configuration, it was possible to perform Doppler cooling on (40)Ca(+) ions, starting from large clouds and reaching single ion sensitivity. This new feature of the trap might be important also for other experiments with ions produced at radioactive ion beam facilities. In this publication, the trap and the laser system will be described, together with their performance with respect to laser cooling applied to large ion clouds down to a single ion.
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Affiliation(s)
- J M Cornejo
- Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada, 18071 Granada, Spain
| | - M Colombano
- Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada, 18071 Granada, Spain
| | - J Doménech
- Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada, 18071 Granada, Spain
| | - M Block
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - P Delahaye
- Grand Accélérateur National d'Ions Lourds, 14000 Caen, France
| | - D Rodríguez
- Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada, 18071 Granada, Spain
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8
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Garcia Ruiz RF, Bissell M, Gottberg A, Stachura M, Hemmingsen L, Neyens G, Severijns N. Perspectives for the VITO beam line at ISOLDE, CERN. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20159307004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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9
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Fabian X, Ban G, Boussaïd R, Breitenfeldt M, Couratin C, Delahaye P, Durand D, Finlay P, Fléchard X, Guillon B, Lemière Y, Leredde A, Liénard E, Méry A, Naviliat-Cuncic O, Pierre E, Porobic T, Quéméner G, Rodríguez D, Severijns N, Thomas J, Van Gorp S. Precise measurement of the angular correlation parameter aβνin the βdecay of 35Ar with LPCTrap. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20146608002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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10
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11
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Triambak S, Finlay P, Sumithrarachchi CS, Hackman G, Ball GC, Garrett PE, Svensson CE, Cross DS, Garnsworthy AB, Kshetri R, Orce JN, Pearson MR, Tardiff ER, Al-Falou H, Austin RAE, Churchman R, Djongolov MK, D'Entremont R, Kierans C, Milovanovic L, O'Hagan S, Reeve S, Sjue SKL, Williams SJ. High-precision measurement of the 19Ne half-life and implications for right-handed weak currents. PHYSICAL REVIEW LETTERS 2012; 109:042301. [PMID: 23006079 DOI: 10.1103/physrevlett.109.042301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2012] [Indexed: 06/01/2023]
Abstract
We report a precise determination of the (19)Ne half-life to be T(1/2)=17.262±0.007 s. This result disagrees with the most recent precision measurements and is important for placing bounds on predicted right-handed interactions that are absent in the current standard model. We are able to identify and disentangle two competing systematic effects that influence the accuracy of such measurements. Our findings prompt a reassessment of results from previous high-precision lifetime measurements that used similar equipment and methods.
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Affiliation(s)
- S Triambak
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
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