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Evidence for Gamow-Teller Decay of 78Ni Core from Beta-Delayed Neutron Emission Studies.
- Source :
-
Physical Review Letters . 8/26/2016, Vol. 117 Issue 9, p1-1. 1p. - Publication Year :
- 2016
-
Abstract
- The β-delayed neutron emission of Ga83,84 isotopes was studied using the neutron time-of-flight technique. The measured neutron energy spectra showed emission from states at excitation energies high above the neutron separation energy and previously not observed in the β decay of midmass nuclei. The large decay strength deduced from the observed intense neutron emission is a signature of Gamow-Teller transformation. This observation was interpreted as evidence for allowed β decay to Ni78 core-excited states in Ge83,84 favored by shell effects. We developed shell model calculations in the proton fpg9/2 and neutron extended fpg9/2+d5/2 valence space using realistic interactions that were used to understand measured β-decay lifetimes. We conclude that enhanced, concentrated β-decay strength for neutron-unbound states may be common for very neutron-rich nuclei. This leads to intense β-delayed high-energy neutron and strong multineutron emission probabilities that in turn affect astrophysical nucleosynthesis models. [ABSTRACT FROM AUTHOR]
- Subjects :
- *NEUTRON emission
*NICKEL compounds
*POTENTIAL barrier
Subjects
Details
- Language :
- English
- ISSN :
- 00319007
- Volume :
- 117
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Physical Review Letters
- Publication Type :
- Academic Journal
- Accession number :
- 118978489
- Full Text :
- https://doi.org/10.1103/PhysRevLett.117.092502