Eur. Phys. J. A (2007) 31: 171-176
https://doi.org/10.1140/epja/i2006-10213-7

Regular Article - Nuclear Structure and Reactions

Observation of M3 isomeric transition from ^156mPm through the βdecay of ¹⁵⁶Nd

¹ Radioisotope Research Center, Nagoya University, 464-8602, Nagoya, Japan
² Graduate School of Engineering, Nagoya University, 464-8603, Nagoya, Japan
³ Graduate School of Engineering, Hiroshima University, 739-8527, Higashi-Hiroshima, Japan
⁴ Research Reactor Institute, Kyoto University, 590-0494, Kumatori, Japan

^* e-mail: i45329a@nucc.cc.nagoya-u.ac.jp

Received: 6 November 2006
Accepted: 25 January 2007
Published online: 12 February 2007

Abstract

An M3 transition in a doubly odd nucleus of ¹⁵⁶Pm was identified by internal conversion electron measurement through the β-decay of ¹⁵⁶Nd which was separated from the fission products of ²³⁵U using the on-line mass separator KUR-ISOL. The isomeric state at 150.3keV de-excites to the ground state with the M3 transition, and the spin-parity is considered to be 1^-. Nilsson configurations are also discussed on the basis of the systematics.