Eur. Phys. J. A (2004) 19: 163-167
https://doi.org/10.1140/epja/i2003-10150-y

Letter

Lifetime of a new high-spin isomer in ¹⁵⁰ Dy

¹ The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, 351-0198, Wako, Saitama, Japan
² Department of Physics, Kyushu University, 812-8581, Fukuoka, Japan
³ Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, 152-8551, Meguro, Tokyo, Japan
⁴ Nishinippon Institute of Technology, 800-03, Kanda, Fukuoka, Japan

^* e-mail: hiroshi@rarfaxp.riken.go.jp

Abstract

A new high-spin isomer in ¹⁵⁰Dy has been observed at an excitation energy of 10.3 MeV by combining the inverse-kinematic reaction induced by a pulsed beam of ¹³²Xe and the -ray recoil-shadow technique. The half-life of this isomeric state has been determined to be ns using the conventional centroid-shift method with the ¹⁴¹Pr(¹⁶O, p6n)¹⁵⁰Dy reaction at 165 MeV. The mechanism producing high-spin isomers in N = 83,84 isotones is qualitatively discussed in terms of the difference of the neutron particle-hole configuration between the high-spin isomer and the lower-lying state.