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

D. Frekers, M. Alanssari, T. Adachi, B. T. Cleveland, M. Dozono, H. Ejiri, S. R. Elliott, H. Fujita, Y. Fujita, M. Fujiwara, K. Hatanaka, M. Holl, D. Ishikawa, H. Matsubara, H. Okamura, P. Puppe, K. Suda, A. Tamii, J. Thies, H. P. Yoshida

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26 Citations (Scopus)


A high-resolution (He3,t) charge-exchange experiment at an incident energy of 420 MeV has been performed on the double beta (ββ) decay nucleus Se82. A detailed Gamow-Teller (GT-) strength distribution in Br82 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 Br82, 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 Ge76, whereas the observed concentration of strength in the three low-lying states is reminiscent of the heavier neighbors Zr96 and Mo100. The strong GT transition to the 75 keV (1+) state makes Se82 interesting for solar neutrino detection. The Se82(νe,e-)Br82 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.

Original languageEnglish
Article number014614
JournalPhysical Review C
Issue number1
Publication statusPublished - 21-07-2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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