Masses new and old: Measurements of 39 isotopes from {sup 51}Ca to {sup 72}Ni

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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 ... continued below

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7 p.

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Vieira, D. J.; Seifert, H. L. & Wouters, J. M. December 1995.

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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.

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7 p.

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OSTI as DE96002591

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  • ENAM `95: international conference on exotic nuclei and atomic masses, Arles (France), 19-23 Jun 1995

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  • Other: DE96002591
  • Report No.: LA-UR--95-3613
  • Report No.: CONF-950660--7
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 137306
  • Archival Resource Key: ark:/67531/metadc623219

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  • December 1995

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  • June 16, 2015, 7:43 a.m.

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  • Nov. 3, 2016, 1:42 p.m.

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Vieira, D. J.; Seifert, H. L. & Wouters, J. M. Masses new and old: Measurements of 39 isotopes from {sup 51}Ca to {sup 72}Ni, article, December 1995; [New Mexico]. (digital.library.unt.edu/ark:/67531/metadc623219/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.