Identification of the new isotope 241Bk

M. Asai, K. Tsukada, S. Ichikawa, M. Sakama, H. Haba, Y. Nagame, I. Nishinaka, K. Akiyama, A. Toyoshima, T. Kaneko, Y. Oura, Y. Kojima, M. Shibata

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Abstract

A new neutron-deficient berkelium isotope 241Bk produced in the 239Pu(6Li, 4n) reaction has been identified using a gas-jet coupled on-line isotope separator. Cm K and L X-rays associated with the EC decay of 241Bk were observed in the mass-241 fraction, and three γ transitions were attributed to the EC decay of 241Bk through X-γ coincidences. The half-life of 241Bk was determined to be 4.6±0.4 min which is 1/2-1/4 of that of theoretical predictions. The half-life value and the observed γ transitions can be consistently explained as a consequence of the allowed EC transition of π7/2 +[633] → ν7/2+[624].

Original languageEnglish
Pages (from-to)17-19
Number of pages3
JournalEuropean Physical Journal A
Volume16
Issue number1
DOIs
Publication statusPublished - Dec 1 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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