Proton-neutron configurations in 236g,mAm and its EC-decay daughter 236Pu

M. Asai, M. Sakama, K. Tsukada, S. Ichikawa, H. Haba, I. Nishinaka, Y. Nagame, S. Goto, Y. Kojima, Y. Oura, H. Nakahara, M. Shibata, K. Kawade

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12 Citations (Scopus)

Abstract

The EC decay of 236Am has been studied using a gas-jet coupled on-line isotope separator. A half-life analysis revealed that there are two EC-decaying states in 236Am: the 5- state with T 1/2 = 3.6(2) min and the (1-) state with T1/2 = 2.9(2) min. The 1185.5 keV level in 236Pu was found to be the K isomer with Kπ = 5- and t1/2 = 1.2(3) μs. EC transitions from 236g,mAm to the 1185.5, 1311.5, and 1340.8 keV levels in 236Pu show small log ft values of 4.9, 5.3, and 4.8, respectively, indicating that the π5/2+[642] → ν5/2 +[633] transition largely contributes to these transitions, and thus, the populated levels should be the π5/2-[523]π5/2 +[642] two-quasiparticle states. The Kπ = 0- octupole band established in 236Pu is located at higher energy than those in 238,240Pu, which implies that the octupole correlations become weak at 236Pu.

Original languageEnglish
Pages (from-to)395-400
Number of pages6
JournalEuropean Physical Journal A
Volume23
Issue number3
DOIs
Publication statusPublished - Mar 1 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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