TY - JOUR
T1 - Proton-neutron configurations in 236g,mAm and its EC-decay daughter 236Pu
AU - Asai, M.
AU - Sakama, M.
AU - Tsukada, K.
AU - Ichikawa, S.
AU - Haba, H.
AU - Nishinaka, I.
AU - Nagame, Y.
AU - Goto, S.
AU - Kojima, Y.
AU - Oura, Y.
AU - Nakahara, H.
AU - Shibata, M.
AU - Kawade, K.
PY - 2005/3/1
Y1 - 2005/3/1
N2 - 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.
AB - 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.
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U2 - 10.1140/epja/i2004-10096-6
DO - 10.1140/epja/i2004-10096-6
M3 - Article
AN - SCOPUS:13244287894
VL - 23
SP - 395
EP - 400
JO - European Physical Journal A
JF - European Physical Journal A
SN - 1434-6001
IS - 3
ER -