Lifetime of a new high-spin isomer in 150 Dy
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
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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.
© Società Italiana di Fisica and Springer-Verlag, 2004