High Spin Physics 2001 - Abstract 011

High Spin Physics 2001, Warsaw, February 6-10, 2001

Abstract No: 011

Submitted on: 21 Dec 2000, 17:36 GMT

Title: Wobbling motion in multi-bands crossing region

Author(s): M. Oi,^1,2 A. Ansari,³ T.Horibata,⁴ N. Onishi⁵, and P.M.Walker¹

Affiliation(s): ¹Department of Physics, University of Surrey, Guildford, U.K., ²Department of Applied Physics, Fukui University, Fukui, Japan, ³Institute of Physics, Bhubaneswar, India, ⁴Department of Engineering, Aomori University, Aomori, Japan, ⁵Department of Engineering, Yamanashi University, Kohu, Japan.

The backbending in the $A\simeq 180$ mass region is expected to be caused by multi-bands crossing between low-K (g- and s-bands) and high-K bands (t-bands) [1].

We analyze a mechanism of coupling of these bands in terms of a dynamical treatment for nuclear rotations, i.e.,wobbling motion [2]. The wobbling states are produced through the generator coordinate method after angular momentum projection (GCM-after-AMP), in which the intrinsic states are constructed through fully self-consistent calculations by the 2d-cranked (or tilted-axis-cranked) HFB method [3]. In particular, the phenomena of ``signature inversion'' and ``signature splitting'' in the t-band (tilted rotational band) are explained in terms of the wobbling model. We also discuss the wobbling motion in terms of a dynamical symmetry breaking and restoration, of the signature symmetry. Our calculations will be compared with new data for in-band E2 transition rates in ¹⁸²Os [4], which may shed light on the mechanism of the anomalous K=25 isomer decay, directly to the yrast band.

$\begin{figure} \begin{center} \epsfysize=6cm \epsfbox{nn.eps} \end{center}\end{figure}$

Figure: (from left to right) rotational alingment in s-band; in high-K band; and wobbling motion.

Bibliography

1

P.M.Walker Int. Conf. on the future of nuclear spectroscopy, Crete, 1993.

2

M.Oi et al, Phys. Lett. B480, 53 (2000).

3

T. Horibata and N. Onishi, Nucl. Phys. A596, 251 (1996).

4

Zs. Podolyák (University of Surrey), et al., Private Communication .

$\fbox{ Preferred presentation of the contribution: in the oral session. }$

High Spin Conference
2000-12-23

Abstract No:	011
Submitted on:	21 Dec 2000, 17:36 GMT
Title:	Wobbling motion in multi-bands crossing region
Author(s):	M. Oi,^1,2 A. Ansari,³ T.Horibata,⁴ N. Onishi⁵, and P.M.Walker¹
Affiliation(s):	¹Department of Physics, University of Surrey, Guildford, U.K., ²Department of Applied Physics, Fukui University, Fukui, Japan, ³Institute of Physics, Bhubaneswar, India, ⁴Department of Engineering, Aomori University, Aomori, Japan, ⁵Department of Engineering, Yamanashi University, Kohu, Japan.