Yrast bands in N=91 isotones

T. Hayakawa; M. Oshima; Y. Hatsukawa; J. Katakura; H. Iimura; M. Matsuda; N. Shinohara; Y. Toh; S. Mitarai; T. Shizuma; M. Sugawara; H. Kusakari

doi:doi:10.1007/s100500070030

EPJ

Yrast bands in N=91 isotones

T. Hayakawa¹ - M. Oshima¹ - Y. Hatsukawa¹ - J. Katakura¹ - H. Iimura¹ - M. Matsuda¹ - N. Shinohara¹ - Y. Toh¹ -
S. Mitarai² - T. Shizuma³ - M. Sugawara⁴ - H. Kusakari⁵

¹ Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
² Kyushu University, Hakozaki, Fukuoka 812-8581, Japan
³ University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
⁴ Chiba Institute of Technology, Narashino, Chiba 275-0023, Japan
⁵ Chiba University, Inage-ku, Chiba 263-8522, Japan
hayakawa@jball4.tokai.jaeri.go.jp

Received: 28 June 2000 / Revised version: 13 October 2000
Communicated by D. Schwalm

Abstract
The in-beam spectroscopy on N=91 isotones has been carried out using the ¹²C + ¹⁵⁰Nd reaction. The ${\nu}i_{13/2}$ and ${\nu}h_{11/2}$ bands of ¹⁵³Sm have been extended up to 33/2⁺ and 31/2^-, respectively. Two new $\gamma$ -rays have been located on the top of the unfavored band with ${\nu}i_{13/2}$ configuration in ¹⁵⁷Dy. Two identical relationships have been established in the low-spin region of the yrast $\nu$ i_13/2 configuration between ¹⁵³Sm and ¹⁵⁵Gd, and between unfavored bands of ¹⁵⁵Gd and ¹⁵⁷Dy. Here all these nuclei have the same neutron number N=91.

PACS
23.20.Lv Gamma transition and level energy - 27.70.+q $150 \leq A \leq 189$

Winter Workshop on Complex Systems
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EPJ

Yrast bands in N=91 isotones

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