Physics – Nuclear Physics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phrvc..47.2941s&link_type=abstract
Physical Review C (Nuclear Physics), Volume 47, Issue 6, June 1993, pp.2941-2953
Physics
Nuclear Physics
58
Relation With Nuclear Matrix Elements And Nuclear Structure, 39<=A<=58, Lifetimes
Scientific paper
Beta-decay half-lives and β-delayed neutron-emission probabilities of the very neutron-rich nuclei 44S and 45-47Cl have been measured. These isotopes, which lie at or close to the N=28 magic shell, were produced in interactions of a 60 MeV/u 48Ca beam from GANIL (Grand Accélérateur National d'Ions Lourds) with a 64Ni target, and were separated by the doubly achromatic spectrometer LISE (Ligne d'Ions Super Epluchés). Their decay was studied by a β-n time correlation measurement. The results are compared to recent model predictions and indicate a rapid weakening of the N=28 shell effect below 4820Ca28. The nuclear structure effects reflected in the decay properties of the exotic S and Cl isotopes may be the clue for the astrophysical understanding of the unusual 48Ca/46Ca abundance ratio measured in the solar system as well as the Ca-Ti-Cr anomalies observed in E. King inclusions of the Allende meteorite.
Anne R.
Bazin Daniel
Borcea Ciprian
Borrel Vincent
Détraz C.
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