2018 Impact factor 2.481
Hadrons and Nuclei


Eur. Phys. J. A 14, 13-16 (2002)
DOI: 10.1140/epja/iepja1438

Short Note

Signature inversion in the yrare band of $\chem{^{119}Xe}$

C.-B. Moon1, T. Komatsubara2, Y. Sasaki2, T. Jumatsu2, K. Yamada2, K. Satou2 and K. Furuno2

1  Department of Physics, Hoseo University, Chung-Nam 336-795, Korea
2  Institute of Physics and Tandem Accelerator Center, University of Tsukuba, Ibaraki 305-8577, Japan

cbmoon@office.hoseo.ac.kr

(Received: 8 January 2002 / Revised version: 18 April 2002 Communicated by D. Schwalm)

Abstract
Excited states of the $\chem{^{119}Xe}$ nucleus have been studied by using in-beam $\gamma $-ray spectroscopy with the $\chem{^{107}Ag}$ ( $\chem{^{16}O}$, p3n) $\chem{^{119}Xe}$ fusion-evaporation reaction at a beam energy of 85 MeV. The level scheme of $\chem{^{119}Xe}$ has been derived from $\gamma $ - $\gamma $ coincidence and $\gamma $- $\gamma $ angular correlation analyses. We have, for the first time, established the second negative-parity favored and unfavored states built on the 11/2 - state, namely the yrare rotational bands in $\chem{^{119}Xe}$. In contrast to the behavior of the yrast bands where the favored states are lying lower in energy, the yrare favored states were observed to lie above the unfavored band. Such a signature inversion in $\chem{^{119}Xe}$ is changed to be normal at $I = 12 \hbar $.

PACS
21.10.Re - Collective levels.
23.20.Lv - Gamma transitions and level energies.
27.60.+j - $90 \leq A \leq 149$ .

© Società Italiana di Fisica, Springer-Verlag 2002