[Formula Presented]-decay half-lives of new neutron-rich isotopes [Formula Presented] and levels in [Formula Presented]

M. Asai, S. Ichikawa, K. Tsukada, M. Sakama, M. Shibata, Y. Kojima, A. Osa, I. Nishinaka, Y. Nagame, K. Kawade, T. Tachibana

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Abstract

[Formula Presented]-decay half-lives of new neutron-rich isotopes [Formula Presented] and [Formula Presented] produced in the 20 MeV proton-induced fission of [Formula Presented] have been determined to be 19.4(27) s and 8.2(13) s, respectively, using a gas-jet coupled on-line isotope separator. The present half-lives and those of the recently identified nuclei [Formula Presented] [Formula Presented] were compared with theoretical predictions. The recent calculation by the gross theory with the new one-particle strength functions shows quite good agreement with the experimental half-lives. Excited states of the daughter nuclides [Formula Presented] and [Formula Presented] have been established for the first time. Level energies of the first [Formula Presented] states in even-even Dy isotopes were found to show an irregular behavior at [Formula Presented] and increasing deformation toward the neutron midshell around [Formula Presented].

Original languageEnglish
Pages (from-to)3060-3065
Number of pages6
JournalPhysical Review C - Nuclear Physics
Volume59
Issue number6
DOIs
Publication statusPublished - 1999 Jan 1

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Asai, M., Ichikawa, S., Tsukada, K., Sakama, M., Shibata, M., Kojima, Y., Osa, A., Nishinaka, I., Nagame, Y., Kawade, K., & Tachibana, T. (1999). [Formula Presented]-decay half-lives of new neutron-rich isotopes [Formula Presented] and levels in [Formula Presented]. Physical Review C - Nuclear Physics, 59(6), 3060-3065. https://doi.org/10.1103/PhysRevC.59.3060