Rotational bands in $^{\bf 181}$Ta

T.R. Saitoh; N. Hashimoto; G. Sletten; R.A. Bark; S. Törmänen; M. Bergström; K. Furuno; K. Furutaka; G.B. Hagemann; T. Hayakawa; T. Komatsubara; A. Maj; S. Mitarai; M. Oshima; J. Sampson; T. Shizuma; P.G. Varmette

doi:doi:10.1007/s100500050166

EPJ

a
b
c
d
e
ap
st
h
plus
ds
pv
ti
qt
am
n

2024 Impact factor 2.8

Hadrons and Nuclei

Eur. Phys. J. A 3, 197-199

Short note

Rotational bands in $^{\bf 181}$ Ta

T.R. Saitoh¹ - N. Hashimoto^1,2 - G. Sletten¹ - R.A. Bark¹ - S. Törmänen¹ - M. Bergström¹ - K. Furuno² - K. Furutaka³ - G.B. Hagemann¹ - T. Hayakawa³ - T. Komatsubara² - A. Maj⁴ - S. Mitarai⁵ - M. Oshima³ - J. Sampson⁶ - T. Shizuma² - P.G. Varmette¹

¹ The Niels Bohr Institute, University of Copenhagen, Roskilde, Denmark
² Department of Physics and Tandem Accelerator Center, University of Tsukuba, Ibaraki, Japan
³ The Japan Atomic Energy Research Institute, Tokai, Ibaraki, Japan
⁴ Henryk Niewodniczanski Inst. of Nucl. Phys., Krakow, Poland
⁵ Department of Physics, Kyushu University, Fukuoka, Japan
⁶ Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK

Received: 26 August 1998 Communicated by B. Herskind

Abstract
High-spin states in ¹⁸¹Ta have been studied via the ¹⁷⁶Yb(¹¹B, $\alpha$ 2n) reaction at 52 MeV using the PEX array and at 57 MeV using the NORDBALL array, with $\alpha$ -particle detection. The previously known, $K^{\pi }=\frac{7}{2}^+$ ground state band and $K^{\pi }=\frac{9}{2}^-$ band have been extended to spins $\frac{29}{2}^+$ and $\frac{31}{2}^-$ , respectively. Two new one-quasiparticle bands, the $K^{\pi }=\frac{5}{2}^+$ band built on the known $\frac{5}{2}^+$ isomer and a $K^{\pi }=(\frac{1}{2}^-)$ band have been observed. Two other rotational bands with three-quasiparticle structure, $K^{\pi }=\frac{15}{2}^-$ and $(\frac{19}{2}^+)$ with $\pi \frac{7}{2}[404]\nu ^2 \frac{1}{2}[510]\frac{9}{2}[624]$ and $\pi \frac{9}{2}[514]\nu ^2 \frac{1}{2}[510]\frac{9}{2}[624]$ configurations, respectively, have been newly observed. The half-life of the $K^{\pi }=(\frac{19}{2}^+)$ bandhead which decays to the head of the $\frac{15}{2}^-$ band has been measured to be 140(36) ns. However, transitions from the $(\frac{19}{2}^+)$ state to the $\frac{15}{2}^-$ band have not been observed.

PACS
21.10.Re Collective levels - 21.10.Tg Lifetimes - 23.20.En Angular distribution and correlation measurements - 23.20.Lv Gamma transitions and level energies - 27.70.+q $150 \le A \le 189$