Lifetimes of rotation-aligned states in190?193Pt

Abstract

rotation-aligned configurations. The systematics of the B(E2) values within the semidecoupled negative paraity bands is discussed. An attempt has been made to measure the half-life of the 7-level in ~sspt. The still existing inconsistences are briefly discussed.

Structure of odd- A Pt isotopes along the line of stability

“…These are in addition to the long-lived, 13/2 + spin isomers in odd-A Pt isotopes, arising from the occupation of the i 13/2 orbital by the unpaired neutron. In even-A isotopes, I π =7 − states are known to have isomeric character, with T 1/2 = 1.85(17), 3.45(12), 5.2(2) and 3.4(2) ns in 192,194,196,198 Pt, respectively [2,3,[13][14][15][16][17]. This situation is mirrored in the odd-A Pt isotopes, where the I π = 25/2 − levels are isomers with T 1/2 = 1.07(6), 3.3(4), 5.0(5) and 9.4(5) ns in 191,193,195,197 Pt, respectively [7,11,16].…”

“…In even-A isotopes, I π =7 − states are known to have isomeric character, with T 1/2 = 1.85(17), 3.45(12), 5.2(2) and 3.4(2) ns in 192,194,196,198 Pt, respectively [2,3,[13][14][15][16][17]. This situation is mirrored in the odd-A Pt isotopes, where the I π = 25/2 − levels are isomers with T 1/2 = 1.07(6), 3.3(4), 5.0(5) and 9.4(5) ns in 191,193,195,197 Pt, respectively [7,11,16]. The half-life of the 25/2 − level in 195 Pt measured in the present work fits quite well into the overall systematic trend.…”