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Title: High energy-resolution measurement of the Se 82 ( He 3 , t ) Br 82 reaction for double- β decay and for solar neutrinos

Journal Article · · Physical Review C
 [1];  [2];  [3];  [4];  [5];  [6]; ORCiD logo [7];  [8];  [9];  [10];  [10];  [1];  [10];  [11];  [10];  [1];  [5];  [10];  [1];  [12]
  1. Univ. of Munster (Germany). Inst. of Nuclear Physics
  2. Univ. of Munster (Germany). Inst. of Nuclear Physics; Nahrain Univ., Baghdad (Iraq)
  3. Tohoku Univ., Sendai (Japan). Research Center for Electron and Photon Science
  4. Univ. of Washington, Seattle, WA (United States). Dept. of Physics; SNOLAB, Sudbury, ON (Canada)
  5. RIKEN, Saitama (Japan)
  6. Osaka Univ. (Japan). Research Center for Nuclear Physics (RCNP); Czech Technical Univ., Prague (Czech Republic). Nuclear Physics
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  8. Osaka Univ. (Japan). Research Center for Nuclear Physics (RCNP) and Dept. of Physics
  9. Osaka Univ. (Japan). Dept. of Physics
  10. Osaka Univ. (Japan). Research Center for Nuclear Physics (RCNP)
  11. Univ. of Tokyo (Japan). Center for Nuclear Study
  12. Tohoku Univ., Sendai (Japan). Cyclotron and Radioisotope Center (CYRIC)

For this study, a high-resolution (3He,t) charge-exchange experiment at an incident energy of 420 MeV has been performed on the double beta (ββ) decay nucleus 82Se. A detailed Gamow-Teller (GT-) strength distribution in 82Br has been extracted, which provides information to the ββ-decay nuclear matrix elements. Three strong and isolated transitions, which are to the 75, 1484 and the 2087 keV states in 82Br, are found to dominate the low-excitation region below ≈ 2.1 MeV. Above 2.1 MeV a sudden onset of a strong GT fragmentation is observed. The degree of fragmentation resembles a situation found in the neighboring A = 76 system 76Ge, whereas the observed concentration of strength in the three low-lying states is reminiscent of the heavier neighbors 96Zr and 100Mo. The strong GT transition to the 75 keV (1+) state makes 82Se interesting for solar neutrino detection. The 82Se(νe,e-) 82Br solar neutrino capture rate in a nonoscillation scenario is therefore evaluated to 668 ± 12(stat) ± 60(sys) SNU, and some of the advantages of using selenium for solar neutrino studies are discussed.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC). Nuclear Physics (NP) (SC-26); Osaka Univ. (Japan); German Research Foundation (DFG); Nahrain Univ., Baghdad (Iraq); Ministry of Higher Education and Scientific Research (Iraq); Ministry of Education, Culture, Sports, Science and Technology (MEXT) (Japan)
Grant/Contract Number:
AC52-06NA25396; FR 601/3-1; 22540310
OSTI ID:
1440433
Report Number(s):
LA-UR-16-24668; PRVCAN; TRN: US1900731
Journal Information:
Physical Review C, Vol. 94, Issue 1; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Figures / Tables (12)