2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 15, 285-289 (2002)
DOI: 10.1140/epja/i2002-10076-x

Short Note

Rotational bands in $\chem{^{169}Re}$

X.H. Zhou1, M. Oshima2, Y. Toh2, Y.H. Zhang1, Y. Zheng1, M. Koizumi2, A. Osa2, T. Hayakawa2, Y. Hatsukawa2, T. Shizuma2 and M. Sugawara3

1  Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, PRC
2  Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
3  Chiba Institute of Technology, Narashino, Chiba 275-0023, Japan

zxh@impcas.ac.cn

(Received: 10 May 2002 / Revised version: 8 July 2002 / Published online: 19 November 2002)

Abstract
High-spin states in 169Re have been investigated by means of in-beam $
\gamma $ -ray spectroscopy techniques with the 144Sm( 28Si, 1p2n $
\gamma $ ) 169Re reaction. X- $
\gamma $ and $
\gamma $- $
\gamma $- t coincidences, $
\gamma $-ray anisotropies, and DCO ratios were measured. A strongly coupled band based on the 9/2 -[514] Nilsson state and a decoupled band built on the h9/2 intruder proton orbital (nominally 1/2 -[541]) have been established. The AB neutron crossings are observed at $
\hbar \omega =0.23$ and 0.27 MeV for the 9/2 -[514] and 1/2 -[541] bands, respectively. The 9/2 -[514] band in 169Re shows the largest signature splitting at low spin among the odd-mass Re isotopes. Band properties of the AB neutron crossing frequencies, alignment gains, and signature splittings are discussed, and compared with those in the heavier odd- A Re isotopes. Additionally, a three-quasipariticle band is observed, and the $\pi $9/2 $^{-}[514]\otimes \nu AE$ configuration is proposed tentatively.

PACS
21.10.Re - Collective levels.
23.20.-g - Electromagnetic transitions.
23.20.Lv - Gamma transitions and level energies.
27.70.+q - $150 \leq A \leq 189$ .

© Società Italiana di Fisica, Springer-Verlag 2002