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Ayyad Y, Mittig W, Tang T, Olaizola B, Potel G, Rijal N, Watwood N, Alvarez-Pol H, Bazin D, Caamaño M, Chen J, Cortesi M, Fernández-Domínguez B, Giraud S, Gueye P, Heinitz S, Jain R, Kay BP, Maugeri EA, Monteagudo B, Ndayisabye F, Paneru SN, Pereira J, Rubino E, Santamaria C, Schumann D, Surbrook J, Wagner L, Zamora JC, Zelevinsky V. Evidence of a Near-Threshold Resonance in ^{11}B Relevant to the β-Delayed Proton Emission of ^{11}Be. Phys Rev Lett 2022; 129:012501. [PMID: 35841541 DOI: 10.1103/physrevlett.129.012501] [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: 02/11/2022] [Revised: 04/29/2022] [Accepted: 06/01/2022] [Indexed: 06/15/2023]
Abstract
A narrow near-threshold proton-emitting resonance (E_{x}=11.4 MeV, J^{π}=1/2^{+}, and Γ_{p}=4.4 keV) was directly observed in ^{11}B via proton resonance scattering. This resonance was previously inferred in the β-delayed proton emission of the neutron halo nucleus ^{11}Be. The good agreement between both experimental results serves as a ground to confirm the existence of such exotic decay and the particular behavior of weakly bound nuclei coupled to the continuum. R-matrix analysis shows a sizable partial decay width for both, proton and α (Γ_{α}=11 keV) emission channels.
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Affiliation(s)
- Y Ayyad
- IGFAE, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - W Mittig
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - T Tang
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - B Olaizola
- ISOLDE-EP, CERN, CH-1211 Geneva 23, Switzerland
| | - G Potel
- Lawrence Livermore National Lab., P.O. Box 808, Livermore, California 94550, USA
| | - N Rijal
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - N Watwood
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - H Alvarez-Pol
- IGFAE, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - D Bazin
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Caamaño
- IGFAE, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - J Chen
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M Cortesi
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - B Fernández-Domínguez
- IGFAE, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - S Giraud
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - P Gueye
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Heinitz
- Laboratory of Radiochemistry, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
| | - R Jain
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - B P Kay
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - E A Maugeri
- Laboratory of Radiochemistry, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
| | - B Monteagudo
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - F Ndayisabye
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - S N Paneru
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Pereira
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - E Rubino
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - C Santamaria
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - D Schumann
- Laboratory of Radiochemistry, Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
| | - J Surbrook
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - L Wagner
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - J C Zamora
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - V Zelevinsky
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
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Rijal N, Wiedenhöver I, Blackmon JC, Anastasiou M, Baby LT, Caussyn DD, Höflich P, Kemper KW, Koshchiy E, Rogachev GV. Measurement of d+^{7}Be Cross Sections for Big-Bang Nucleosynthesis. Phys Rev Lett 2019; 122:182701. [PMID: 31144906 DOI: 10.1103/physrevlett.122.182701] [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: 08/23/2018] [Revised: 12/03/2018] [Indexed: 06/09/2023]
Abstract
The cross sections of nuclear reactions between the radioisotope ^{7}Be and deuterium, a possible mechanism of reducing the production of mass-7 nuclides in big-bang nucleosynthesis, were measured at center-of-mass energies between 0.2 and 1.5 MeV. The measured cross sections are dominated by the (d,α) reaction channel, towards which prior experiments were mostly insensitive. A new resonance at 0.36(5) MeV with a strength of ωγ=1.7(5) keV was observed inside the relevant Gamow window. Calculations of nucleosynthesis outcomes based on the experimental cross section show that the resonance reduces the predicted abundance of primordial ^{7}Li, but not sufficiently to solve the primordial lithium problem.
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Affiliation(s)
- N Rijal
- Physics Department, Florida State University, Tallahassee, Florida 32306, USA
| | - I Wiedenhöver
- Physics Department, Florida State University, Tallahassee, Florida 32306, USA
| | - J C Blackmon
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - M Anastasiou
- Physics Department, Florida State University, Tallahassee, Florida 32306, USA
| | - L T Baby
- Physics Department, Florida State University, Tallahassee, Florida 32306, USA
| | - D D Caussyn
- Physics Department, Florida State University, Tallahassee, Florida 32306, USA
| | - P Höflich
- Physics Department, Florida State University, Tallahassee, Florida 32306, USA
| | - K W Kemper
- Physics Department, Florida State University, Tallahassee, Florida 32306, USA
| | - E Koshchiy
- Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
| | - G V Rogachev
- Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
- Department of Physics & Astronomy, Texas A&M University, College Station, Texas 77843, USA
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Blackmon JC, Wiedenhöver I, Belarge J, Kuvin SA, Anastasiou M, Baby LT, Baker J, Colbert K, Deibel CM, de Lucio O, Gardiner HE, Gay DL, Good E, Höflich P, Hood AAD, Keely N, Lai J, Laminack A, Linhardt LE, Lighthall J, Macon KT, Need E, Quails N, Rasco BC, Rijal N, Volya A. Studies of X-ray burst reactions with radioactive ion beams from RESOLUT. EPJ Web Conf 2017. [DOI: 10.1051/epjconf/201716501005] [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: 11/15/2022] Open
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Upadhyaya BP, Shakya G, Adhikari S, Rijal N, Acharya J, Maharjan L, Marasini BR. Scrub Typhus: An Emerging Neglected Tropical Disease in Nepal. J Nepal Health Res Counc 2016; 14:122-127. [PMID: 27885295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
BACKGROUND Scrub typhus is a neglected tropical disease and is under reported from Nepal. The objective of this study was to investigate the sero-epidemiology of scrub typhus in patients suffering from acute febrile illness. METHODS A total of 434 specimens collected from July to November 2015 at National Public Health Laboratory (NPHL) were investigated for detection of immunoglobulin M (IgM) antibody to Orientiatsutsugamushi.The Scrub Typhus Detect TM kit (InBios, USA) was used to detect the antibodies to O.tsutsugamushi in human serum. Randomly selected 10% positive specimens were used for confirmation by dot- enzyme-linked immunosorbent assay and indirect immunofluorescence assay. RESULTS Of the total, 175 (40.3%) were positive for IgM antibodies to O. tsutsugamushi. Positive results of scrub typhus were highest among female in 11-20 year followed by males in 41-50 years age group. The IgM antibodies to O. tsutusugamushi were positive in specimens of various geographical regions including 30 districts of Nepal. Positive cases were found in various ecological regions of Nepal. CONCLUSIONS Scrub typhus is one of the neglected tropical diseases in Nepal. Patients with acute febrile illness should be investigated for scrub typhus with high priority. There is an urgent need of reliable and affordable diagnostic tests at all level of health facilities of Nepal. Surveillance and public health awareness about the disease transmission and preventive measures needs to be initiated.
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Affiliation(s)
| | - G Shakya
- National Public Health Laboratory, Kathmandu, Nepal
| | - S Adhikari
- National Public Health Laboratory, Kathmandu, Nepal
| | - N Rijal
- National Public Health Laboratory, Kathmandu, Nepal
| | - J Acharya
- National Public Health Laboratory, Kathmandu, Nepal
| | - L Maharjan
- National Public Health Laboratory, Kathmandu, Nepal
| | - B R Marasini
- Epidemiology and Disease Control Division, Department of Health Services, Nepal
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