Nuclear structure relevant to neutrinoless double β decay: The valence protons in Ge76 and Se76

B. P. Kay, J. P. Schiffer, S. J. Freeman, T. Adachi, J. A. Clark, C. M. Deibel, H. Fujita, Y. Fujita, P. Grabmayr, K. Hatanaka, D. Ishikawa, H. Matsubara, Y. Meada, H. Okamura, K. E. Rehm, Y. Sakemi, Y. Shimizu, H. Shimoda, K. Suda, Y. TameshigeA. Tamii, C. Wrede

Research output: Contribution to journalArticlepeer-review

110 Citations (Scopus)

Abstract

The possibility of observing neutrinoless double β decay offers the opportunity of determining the effective neutrino mass if the nuclear matrix element were known. Theoretical calculations are uncertain, and the occupation of valence orbits by nucleons active in the decay is likely to be important. The occupation of valence proton orbits in the ground states of Ge76, a candidate for such decay, and Se76, the corresponding daughter nucleus, is determined by precisely measuring cross sections for proton-removing transfer reactions. As in previous work on neutron occupation, we find that the Fermi surface for protons is much more diffuse than previously thought, and the occupancies of at least three orbits change significantly between the two 0+ ground states.

Original languageEnglish
Article number021301
JournalPhysical Review C - Nuclear Physics
Volume79
Issue number2
DOIs
Publication statusPublished - 2009 Feb 2

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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