A SEMI-CLASSICAL APPROACH TO SIGNATURE SPLITTING AND SIGNATURE INVERSION IN ODD–ODD NUCLEI

2011 ◽  
Vol 20 (06) ◽  
pp. 1455-1463 ◽  
Author(s):  
VINOD KUMAR ◽  
SURESH KUMAR ◽  
SUSHIL KUMAR ◽  
ZAFRUL HASAN ◽  
BIPIN SINGH KORANGA ◽  
...  
Keyword(s):  
Particle Model ◽  
Spin States ◽  
Classical Approach ◽  
Axially Symmetric ◽  
Triaxial Deformation ◽  
Deformed Nuclei ◽  
Signature Splitting ◽  
Rotational Bands ◽  
Signature Inversion ◽  
Symmetric Rotor

The signature inversion observed in rotational bands belonging to high-j configurations of odd–odd deformed nuclei has been analyzed within the framework of an axially symmetric rotor plus two-particle model. The Coriolis and n–p interaction are considered the main cause of energy staggering. However, γ-triaxial deformation and the numbers of valence protons, Np, and neutrons, Nn also contribute to the energy staggering between odd- and even-spin states.

High Spin States in the Odd–Odd 150Eu Nucleus

1997 ◽  
Vol 12 (16) ◽  
pp. 2791-2808 ◽  
Author(s):  
J. M. Chatterjee ◽  
Somapriya Basu ◽  
U. Datta Pramanik ◽  
S. Bhattacharya ◽  
R. K. Chattopadhyay ◽  
...  
Keyword(s):  
High Spin ◽  
Positive Parity ◽  
Spin States ◽  
Phonon Coupling ◽  
Axially Symmetric ◽  
Rotational Bands ◽  
Isomeric Level ◽  
High Spin States ◽  
Symmetric Rotor ◽  
Rotor Core

High spin rotational bands in the odd–odd 150Eu nucleus, produced in the 148Nd(7Li,5n) reaction, were investigated by in-beam γ spectroscopy. Seven bands above the 588.8 keV (45 ns) isomeric level were observed. Probable single- and double-octupole-phonon coupling states were identified. Two positive parity bands are interpreted in terms of two quasiparticles (a proton and a neutron) coupled to an axially symmetric rotor core. Otherwise, the rest of the high spin levels are described by multiparticle–hole excitations.

OBSERVATION OF FOUR-QUASIPARTICLE BAND AND SIGNATURE SPLITTING FEATURES IN 160Tm

2008 ◽  
Vol 17 (supp01) ◽  
pp. 21-28 ◽  
Author(s):  
J. B. LU ◽  
D. YANG ◽  
L. SUN ◽  
L. L. WANG ◽  
H. D. WANG ◽  
...  
Keyword(s):  
High Spin ◽  
Gamma Ray ◽  
Spin States ◽  
Signature Splitting ◽  
Rotational Bands ◽  
High Spin States ◽  
Gamma Ray Spectroscopy ◽  
Quasiparticle Band

High-spin states of 160 Tm are studied via in-beam gamma-ray spectroscopy. Previously known rotational bands are confirmed. These bands feed into low-lying states which are enriched in this work. A four-quasiparticle band with configuration of πg7/2 ⊗ νh9/2 ⊗ ν(i13/2)2 is established. Signature splitting features of πh11/2⊗νi13/2 and πh11/2⊗νh9/2 bands are presented.

Signature splitting in magnetic rotational bands

Pramana ◽  
1999 ◽  
Vol 53 (3) ◽  
pp. 463-468 ◽  
Author(s):  
A Mita ◽  
Ashok K Jain ◽  
Alpana Goel ◽  
Balraj Singh
Keyword(s):  
Signature Splitting ◽  
Rotational Bands

scholarly journals SIGNATURE SPLITTING IN 173W WITH TRIAXIAL PARTICLE ROTOR MODEL

2009 ◽  
Vol 18 (01) ◽  
pp. 109-122 ◽  
Author(s):  
B. QI ◽  
S. Q. ZHANG ◽  
S. Y. WANG ◽  
J. MENG
Keyword(s):  
Excellent Agreement ◽  
Degree Of Freedom ◽  
The Self ◽  
Energy Spectra ◽  
Signature Splitting ◽  
Signature Inversion ◽  
Self Consistent ◽  
Strong Competition ◽  
Intruder Orbital ◽  
Rotor Model

A particle rotor model with a quasi-neutron coupled with a triaxially deformed rotor is applied to study signature splitting for bands with intruder orbital ν7/2+[633] and nonintruder orbital ν5/2-[512] in 173 W . Excellent agreement with the observed energy spectra has been achieved for both bands. Signature splitting for band ν7/2+[633], and band ν5/2-[512] before the onset of signature inversion, is satisfactorily reproduced by introducing the γ degree of freedom. The phase and amplitude of signature splitting in band ν5/2-[512] are attributed to strong competition between 2f7/2 and 1h9/2 components. However, the self-consistent explanation of signature inversion in band ν5/2-[512] is beyond the present one quasi-neutron coupled with a triaxially deformed rotor.

Irrotational core in deformed nuclei

1982 ◽  
Vol 60 (3) ◽  
pp. 337-339
Author(s):  
B. A. Bishara
Keyword(s):  
Rare Earth ◽  
Shell Model ◽  
Rare Earths ◽  
Axially Symmetric ◽  
Deformed Nuclei ◽  
The Core ◽  
Rotator Model ◽  
Rare Earth Nuclei ◽  
Rotationally Invariant

The construction of the "rotationally invariant core" (RIC) of the governor model for the deformed even–even nuclei has been studied for the rare earths. The comparison of the RIC nucleons with the shell model configurations shows that the model's assumption of "spherical" RIC is almost true only for the axially symmetric deformed nuclei. For asymmetric triaxial deformed nuclei, the study supports the assumption of the governor asymmetric rotator model, namely that the RIC is an axially symmetric prolate. The core shrinkage at higher rotational energies has been also calculated for several rare-earth nuclei.

High-spin states in doubly odd176Reand signature inversion inπh9/2⊗νi13/2structures

1999 ◽  
Vol 59 (3) ◽  
pp. 1298-1315 ◽  
Author(s):  
M. A. Cardona ◽  
A. J. Kreiner ◽  
D. Hojman ◽  
G. Levinton ◽  
M. E. Debray ◽  
...  
Keyword(s):  
High Spin ◽  
Spin States ◽  
Signature Inversion ◽  
High Spin States
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