Positive-parity rotational bands in odd-Apf-shell nuclei: A shell model description

1998 ◽  
Vol 58 (1) ◽  
pp. 179-183 ◽  
Author(s):  
Alfredo Poves ◽  
Jorge Sánchez Solano
Keyword(s):  
Shell Model ◽  
Positive Parity ◽  
Model Description ◽  
Rotational Bands

Projected Shell Model Description of Positive Parity Band of 130Pr Nucleus

2017 ◽  
Vol 48 (1) ◽  
pp. 85-91
Author(s):  
Suram Singh ◽  
Amit Kumar ◽  
Dhanvir Singh ◽  
Chetan Sharma ◽  
Arun Bharti ◽  
...  
Keyword(s):  
Shell Model ◽  
Positive Parity ◽  
Model Description ◽  
Projected Shell Model ◽  
Parity Band ◽  
Positive Parity Band

New positive-parity states and the shell-model description of 111Sn

1984 ◽  
Vol 425 (2) ◽  
pp. 317-344 ◽  
Author(s):  
H. Prade ◽  
W. Enghardt ◽  
W.D. Fromm ◽  
H.U. Jäger ◽  
L. Käubler ◽  
...  
Keyword(s):  
Shell Model ◽  
Positive Parity ◽  
Model Description

Properties of the levels in 22Na deduced from the 19F(α,nγ)22Na reaction

1976 ◽  
Vol 54 (11) ◽  
pp. 1134-1148 ◽  
Author(s):  
J. D. MacArthur ◽  
A. J. Brown ◽  
P. A. Butler ◽  
L. L. Green ◽  
C. J. Lister ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Spherical Shell ◽  
Shell Model ◽  
Gamma Rays ◽  
Linear Polarization ◽  
Experimental Information ◽  
Positive Parity ◽  
Model Program ◽  
Rotational Bands ◽  
Mean Lifetimes

For gamma rays following the 19F(α,nγ)22Na reaction, angular distribution, linear polarization, and DSA measurements have been analysed to extend the experimental information on the rotational bands in 22Na. In particular the spins, parities, and mean lifetimes of the following states belonging to the indicated bands have been determined; (Ex, Jπ, τm, K); 3.707 MeV, 6+, 110 ± 10 fs, K = 3+; 1.984 MeV, 3+, —, K = 0+; 4.710 MeV, 5+, 50 ± 20 fs, K = 0+; 4.071 MeV, 4+, —, K = 0+. In addition, the spins, parities and lifetimes of the 4.360, 5.063, and 5.100 MeV states were determined to be 2+, <10 fs; 2+, <20 fs; and 4+, 55 ± 15 fs respectively. Besides the known branches from the 4.710 MeV state, a 5 ± 1% branch to the 2.969 MeV state was observed; while for the 5.100 MeV state, branches of 18 ± 2, 15 ± 5, 12 ± 2, 18 ± 2, and 37 ± 3% were observed to the ground, 0.891, 1.528, 3.060, and 4.071 MeV states. All the positive parity states below 5.1 MeV have been interpreted in terms of spherical shell model configurations for six particles in the s–d shell predicted by the Manchester–Glasgow shell model program, using the Preedom and Wildenthal interaction.

Low-lying Negative-parity Levels of 17N and 18N

1984 ◽  
Vol 37 (1) ◽  
pp. 17 ◽  
Author(s):  
FC Barker
Keyword(s):  
Shell Model ◽  
Weak Coupling ◽  
Coupling Model ◽  
Negative Parity ◽  
Positive Parity ◽  
Model Calculations

On the basis of a weak-coupling model, adjustments are made to the interactions used in the full shell model calculations of Millener in order to fit the experimental energies of the low-lying negativeparity levels of 16N and of the low-lying positive-parity levels of 180 and 190 . The predicted energies of the low-lying negative-parity levels of 17N then agree better with experiment, while those for 18N lead to suggested spin assignments for the observed levels.

A Shell Model Description of Light Nuclei

Physics Today ◽  
1978 ◽  
Vol 31 (8) ◽  
pp. 55-56 ◽  
Author(s):  
I. S. Towner ◽  
John W. Negele
Keyword(s):  
Shell Model ◽  
Light Nuclei ◽  
Model Description

Shape mixing and the shell-model description of the isotopes of neon

1971 ◽  
Vol 35 (1) ◽  
pp. 11-15 ◽  
Author(s):  
M.H. Macfarlane ◽  
A.P. Shukla
Keyword(s):  
Shell Model ◽  
Model Description

scholarly journals Shell model description of heavy nuclei and abnormal collective motions

2018 ◽  
Vol 178 ◽  
pp. 02015
Author(s):  
Chong Qi
Keyword(s):  
Shell Model ◽  
Degrees Of Freedom ◽  
Large Scale ◽  
Model Description ◽  
Heavy Nuclei ◽  
Collective Models ◽  
Collective Behaviors ◽  
Electromagnetic Transition ◽  
Nuclear Shell ◽  
Model Approach

In this contribution I present systematic calculations on the spectroscopy and electromagnetic transition properties of intermediate-mass and heavy nuclei around 100Sn and 208Pb. We employed the large-scale configuration interaction shell model approach with realistic interactions. Those nuclei are the longest isotopic chains that can be studied by the nuclear shell model. I will show that the yrast spectra of Te isotopes show a vibrational-like equally spaced pattern but the few known E2 transitions show rotational-like behaviour. These kinds of abnormal collective behaviors cannot be reproduced by standard collective models and provide excellent background to study the competition of single-particle and various collective degrees of freedom. Moreover, the calculated B(E2) values for neutron-deficient and heavier Te isotopes show contrasting different behaviours along the yrast line, which may be related to the enhanced neutron-proton correlation when approaching N=50. The deviations between theory and experiment concerning the energies and E2 transition properties of low-lying 0+ and 2+ excited states and isomeric states in those nuclei may provide a constraint on our understanding of nuclear deformation and intruder configuration in that region.

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