Competing phenomena: high-seniority excitations and γ-softness in 184Os

doi:10.1016/S0375-9474(01)01274-X

Nuclear Physics A

Volume 699, Issues 3–4, 11 March 2002, Pages 415-449

https://doi.org/10.1016/S0375-9474(01)01274-X Get rights and content

Abstract

The nuclear structure of the stable nucleus ¹⁸⁴₇₆Os has been studied including five newly identified rotational bands built on 2-quasiparticle K^π=0⁺, 6⁻, 8⁻ couplings. The excitation energies of the proposed multi-quasiparticle excitations are in good agreement with predictions of blocked BCS calculations. The interaction responsible for the first band crossing, caused by a high-K tilted 2-neutron configuration, is calculated and a new interpretation presented for the yrast states after the interaction. A second crossing with an aligned s–β band is also reported. The yrast behaviour at high spins is dominated by a wealth of short-lived (nanoseconds and shorter) high-K levels. The low reduced hindrances for intrinsic state decays are discussed, and attributed to the triaxial shapes and fluctuations predicted by configuration-constrained potential-energy-surface calculations. Comparisons with neighbouring nuclei are made.

References (42)

R.G. Helmer et al.
Nucl. Phys. A
(1968)
P. Chowdhury et al.
Nucl. Phys. A
(1988)
C.J. Pearson et al.
Nucl. Phys. A
(2000)
C.S. Purry et al.
Nucl. Phys. A
(2000)
T. Shizuma et al.
Phys. Lett. B
(1998)
F.R. Xu et al.
Phys. Lett. B
(1998)
K.S. Krane et al.
Nucl. Data Tables
(1973)
F. Rösel et al.
Nucl. Data Tables
(1978)
T. Yamazaki et al.
Nucl. Phys. A
(1973)
R. Hochel et al.
Nucl. Phys. A
(1973)

P.M. Walker et al.

Phys. Lett. B

(1993)

S. Frauendorf

Nucl. Phys. A

(1993)

T. Kutsarova et al.

Nucl. Phys. A

(1995)

Aswini Kumar Rath, P.M. Walker and C.R. Praharaj, Phys. Rev. C, submitted and private...

G.D. Dracoulis et al.

Phys. Lett. B

(1998)

P. Alexander et al.

Phys. Rev. B

(1964)

S.T. Belyaev

Mat. Fys. Medd. Dan. Vid. Selsk.

(1959)

P.M. Walker et al.

Nucl. Phys. A

(1994)

R. Bengtsson et al.

Nucl. Data Tables

(1986)

C.J. Gallagher et al.

Phys. Rev.

(1958)

Cited by (0)

¹: Present address: National Accelerator Centre, Faure, ZA-7131, South Africa.

View full text