First beta-decay studies of the neutron-rich isotopes 53-55Sc and 56-59V

Details First beta-decay studies of the neutron-rich isotopes 53-55Sc and 56-59V First beta-decay studies of the neutron-rich isotopes 53-55Sc and 56-59V

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998nupha.632..205s&link_type=abstract

Nuclear Physics A, Volume 632, Issue 2, p. 205-228.

Physics

Nuclear Physics

28

53, 54, 55Sc, 56, 57, 58, 59V(Β-) [From 9Be (65Cu, X), E=64.5 Mev/Nucleon], Measured Eγ, Iγ, Βγ-Coin, T1/2, Deduced R-Process Implications.

Scientific paper

The neutron-rich isotopes 53-55Sc and 56-59V have been produced at GANIL in interactions of a 64.5 MeV/u 65Cu beam with a 9Be target. They were separated by the doubly achromatic spectrometer LISE3. Beta-decay half-lives and subsequent low-energy γ-rays were observed for the first time. The present results are compared to QRPA model predictions. The quick drop of the half-life observed at N=33 for 5320Ca33 is weaker for 5623V33 and absent for 2154Sc33, indicating a vanishing of the N=32 subshell north to 52Ca32. In an astrophysical context, these neutron-rich isotopes represent r-process progenitors which, after β-decay, would produce the correlated isotopic over-abundances of 54Cr, 58Fe, 64Ni in certain refractory inclusions of meteorites.

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