Masses and ß-Decay Spectroscopy of Neutron-Rich Odd-Odd
Phys Rev Lett
; 120(18): 182502, 2018 May 04.
Article
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| MEDLINE
| ID: mdl-29775351
ABSTRACT
The structure of deformed neutron-rich nuclei in the rare-earth region is of significant interest for both the astrophysics and nuclear structure fields. At present, a complete explanation for the observed peak in the elemental abundances at Aâ¼160 eludes astrophysicists, and models depend on accurate quantities, such as masses, lifetimes, and branching ratios of deformed neutron-rich nuclei in this region. Unusual nuclear structure effects are also observed, such as the unexpectedly low energies of the first 2^{+} levels in some even-even nuclei at N=98. In order to address these issues, mass and ß-decay spectroscopy measurements of the ^{160}Eu_{97} and ^{162}Eu_{99} nuclei were performed at the Californium Rare Isotope Breeder Upgrade radioactive beam facility at Argonne National Laboratory. Evidence for a gap in the single-particle neutron energies at N=98 and for large deformation (ß_{2}â¼0.3) is discussed in relation to the unusual phenomena observed at this neutron number.
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Colección:
01-internacional
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MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Año:
2018
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Article
País de afiliación:
Estados Unidos