The gallium solar neutrino capture cross section revisited
Solar neutrino flux constraints from the legacy GALLEX/GNO and SAGE experiments continue to influence contemporary global analyses of neutrino properties. The constraints depend on the neutrino absorption cross sections for various solar sources. Following recent work updating the 51Cr and 37Ar neut...
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Elsevier
2025-02-01
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| Series: | Physics Letters B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S037026932500019X |
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| author | W.C. Haxton Evan Rule |
| author_facet | W.C. Haxton Evan Rule |
| author_sort | W.C. Haxton |
| collection | DOAJ |
| description | Solar neutrino flux constraints from the legacy GALLEX/GNO and SAGE experiments continue to influence contemporary global analyses of neutrino properties. The constraints depend on the neutrino absorption cross sections for various solar sources. Following recent work updating the 51Cr and 37Ar neutrino source cross sections, we reevaluate the 71Ga solar neutrino cross sections, focusing on contributions from transitions to 71Ge excited states, but also revising the ground-state transition to take into account new 71Ge electron-capture lifetime measurements and various theory corrections. The excited-state contributions have been traditionally taken from forward-angle (p,n) cross sections. Here we correct this procedure for the ≈10%–20% tensor operator contribution that alters the relationship between Gamow-Teller and (p,n) transition strengths. Using state-of-the-art nuclear shell-model calculations to evaluate this correction, we find that it lowers the 8B and hep neutrino cross sections. However, the addition of other corrections, including contributions from near-threshold continuum states that radiatively decay, leads to an overall increase in the 8B and hep cross sections of ≈10% relative to the values recommended by Bahcall. Uncertainties are propagated using Monte Carlo simulations. |
| format | Article |
| id | doaj-art-b13585ad8c684772a37ddb6f554223da |
| institution | Kabale University |
| issn | 0370-2693 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj-art-b13585ad8c684772a37ddb6f554223da2025-02-10T04:33:55ZengElsevierPhysics Letters B0370-26932025-02-01861139259The gallium solar neutrino capture cross section revisitedW.C. Haxton0Evan Rule1Department of Physics, University of California, Berkeley, CA, 94720, USA; Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USADepartment of Physics, University of California, Berkeley, CA, 94720, USA; Los Alamos National Laboratory, Los Alamos, NM, 87545, USA; Corresponding author at: Department of Physics, University of California, Berkeley, CA, 94720, USA.Solar neutrino flux constraints from the legacy GALLEX/GNO and SAGE experiments continue to influence contemporary global analyses of neutrino properties. The constraints depend on the neutrino absorption cross sections for various solar sources. Following recent work updating the 51Cr and 37Ar neutrino source cross sections, we reevaluate the 71Ga solar neutrino cross sections, focusing on contributions from transitions to 71Ge excited states, but also revising the ground-state transition to take into account new 71Ge electron-capture lifetime measurements and various theory corrections. The excited-state contributions have been traditionally taken from forward-angle (p,n) cross sections. Here we correct this procedure for the ≈10%–20% tensor operator contribution that alters the relationship between Gamow-Teller and (p,n) transition strengths. Using state-of-the-art nuclear shell-model calculations to evaluate this correction, we find that it lowers the 8B and hep neutrino cross sections. However, the addition of other corrections, including contributions from near-threshold continuum states that radiatively decay, leads to an overall increase in the 8B and hep cross sections of ≈10% relative to the values recommended by Bahcall. Uncertainties are propagated using Monte Carlo simulations.http://www.sciencedirect.com/science/article/pii/S037026932500019XSolar neutrinosNeutrino captureGalliumCharge-exchange reactions |
| spellingShingle | W.C. Haxton Evan Rule The gallium solar neutrino capture cross section revisited Physics Letters B Solar neutrinos Neutrino capture Gallium Charge-exchange reactions |
| title | The gallium solar neutrino capture cross section revisited |
| title_full | The gallium solar neutrino capture cross section revisited |
| title_fullStr | The gallium solar neutrino capture cross section revisited |
| title_full_unstemmed | The gallium solar neutrino capture cross section revisited |
| title_short | The gallium solar neutrino capture cross section revisited |
| title_sort | gallium solar neutrino capture cross section revisited |
| topic | Solar neutrinos Neutrino capture Gallium Charge-exchange reactions |
| url | http://www.sciencedirect.com/science/article/pii/S037026932500019X |
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