Masses new and old: Measurements of 39 isotopes from {sup 51}Ca to {sup 72}Ni
- and others
The most recent mass measurements using the Time-of-Flight Isochronous (TOFI) spectrometer are presented. The masses of 8 neutron-rich nuclei are reported for the first time. Good agreement between these results and a previous TOFI experiment is observed except for the most neutron-rich isotopes of vanadium through iron where the present results are more bound and in better agreement with theory. An unreasonably low two-neutron separation energy for {sup 68}Ni suggests the presence of a high-lying, long-lived isomeric state in this nucleus. These results are contrasted with the latest shell model calculations and a variety of mass model predictions. In general good agreement is found, however, an enhanced binding-energy region centered around {sup 51}Ca and {sup 52-54}Sc persists. The neutron-excess dependence of neutron and proton pairing energies in the f{sub 7/2} shell are found to be considerably weaker than those obtained in a global fit.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 137306
- Report Number(s):
- LA-UR-95-3613; CONF-950660-7; ON: DE96002591; TRN: 95:008793
- Resource Relation:
- Conference: ENAM `95: international conference on exotic nuclei and atomic masses, Arles (France), 19-23 Jun 1995; Other Information: PBD: 1995
- Country of Publication:
- United States
- Language:
- English
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