A shell model of the cobalt isotopes

1978 ◽  
Vol 56 (6) ◽  
pp. 793-800 ◽  
Author(s):  
T. Taylor ◽  
R. G. Summers-Gill
Keyword(s):  
Model Space ◽  
Binding Energies ◽  
Spin States ◽  
Matrix Elements ◽  
Excitation Energies ◽  
Rotational Bands ◽  
High Spin States ◽  
Spectroscopic Factors ◽  
Modified Surface ◽  
Surface Delta Interaction

Binding energies, excitation energies, and single nucleon transfer spectroscopic factors of the 55 ≤ A ≤ 60 cobalt isotopes have been calculated in a 1f–2p shell configuration space assuming a 56Ni core. Single-particle energies were determined empirically and two-body matrix elements were computed with the modified surface delta interaction (MSDI). The observed properties of the low-lying states are reasonably well reproduced but some low-spin states observed above 1.3 MeV are outside the model space. The theory predicts quasi-rotational bands of high-spin states in both odd- and even-A cobalt isotopes.

Energy Levels of 50Ca Nucleus as a Function of the Classical Coupling Angle within MSDI

2021 ◽  
Vol 19 (5) ◽  
pp. 61-67
Author(s):  
Ali Khalaf Hasan ◽  
Dalal Naji Hameed
Keyword(s):  
Experimental Data ◽  
Angular Momentum ◽  
Shell Model ◽  
Energy Levels ◽  
Model Space ◽  
Closed Shell ◽  
Excitation Energies ◽  
Modified Surface ◽  
Coupling Angle ◽  
Surface Delta Interaction

In the construction of this kind of shell model, we take the residual interaction to be modified surface delta interaction MSDI. We have studied the excitation energies of the 50Ca a nucleus, which contain two neutrons outside closed shell of the 48Ca. Neutrons are in the model space pfpg. The energy levels and angular momentum of all possible cases were investigated. Thereby, we have effectively utilized a theoretical process to find link among the traditional coupling angle and energy levels at different orbital within neutron - neutron interaction. We observe the energy stages appear to follow two overall functions which depend on the classical coupling angles but are unconstrained of angular momentum I. We find out that our results agree with the experimental data.

Study of High-spin States for 90,91,92Y Isotopes by Using Oxbash Code

2021 ◽  
Vol 14 (1) ◽  
pp. 25-33
Keyword(s):  
Experimental Data ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Model Space ◽  
Low Energy ◽  
Energy Spectra ◽  
Spin States ◽  
Nuclear Shell Model ◽  
High Spin States ◽  
Nuclear Shell

Abstract: In this paper, calculations of 90,91,92Y isotopes have been performed by application of nuclear shell model in the Gloeckner (Gl) model space for two different interactions (Gloeckner (Gl) and Gloeckner pulse bare G-Matrix (Glb) using Oxbash code. The energy levels are compared and discussed with experimental data and based on our results, many predictions about spins and parity were observed between experimental states, in addition to the predictions of low-energy spectra and B (E2; ↓) and B (M1; ↓)) transitional strengths in the isotopes 90,91,92Y. These predictions were not known in the experimental data. Keywords: Energy levels, Transition probabilities, Oxbash code.

High-spin states of rotational bands built upon νi13/2 in 166Lu

2000 ◽  
Vol 8 (1) ◽  
pp. 1-3 ◽  
Author(s):  
C. S. Lee ◽  
J. H. Ha ◽  
J. H. Lee ◽  
J. Y. Huh ◽  
J. C. Kim ◽  
...  
Keyword(s):  
High Spin ◽  
Spin States ◽  
Rotational Bands ◽  
High Spin States

High-Spin States inNe20and Their Possible Classification into Rotational Bands

1972 ◽  
Vol 5 (6) ◽  
pp. 1995-2006 ◽  
Author(s):  
A. D. Panagiotou ◽  
H. E. Gove ◽  
S. Harar
Keyword(s):  
High Spin ◽  
Spin States ◽  
Rotational Bands ◽  
High Spin States

scholarly journals High spin structure of 155Dy

2019 ◽  
Vol 3 ◽  
pp. 114
Author(s):  
C. T. Papadopoulos ◽  
R. Vlastou ◽  
M. Serris ◽  
C. A. Kalfas ◽  
N. Fotiades ◽  
...  
Keyword(s):  
High Spin ◽  
Beam Energy ◽  
Spin Structure ◽  
Negative Parity ◽  
Spin States ◽  
Detailed Structure ◽  
Strongly Coupled ◽  
Rotational Bands ◽  
High Spin States ◽  
Coincidence Measurements

High spin states in 155Dy have been studied by γ-γ coincidence measurements via the 124Sn(36S, 5n)155Dy reaction at a beam energy of 155 MeV. Eight rotational bands have been populated and observed up to high spin (I<91/2).The band features have been analysed within the framework of the cranked shell model. The Ì13/2 neutron alignments and the h11/2 proton alignments are discussed. B(M1)/B(E2) ratios have also been extracted for the strongly coupled bands to deduce further information on the detailed structure of these bands. For the highest states (above spin 30) of the negative parity bands an irregularity in y-ray energies appears which is discussed in terms of band termination.

ROTATIONALLY SINGLE-PARTICLE AND VIBRATIONAL EXCITED STATES OF DEFORMABLE ODD NUCLEI WITH SMALL NONAXIALITY

2003 ◽  
Vol 12 (01) ◽  
pp. 41-58 ◽  
Author(s):  
SH. SHARIPOV ◽  
M. J. ERMAMATOV
Keyword(s):  
Excited States ◽  
High Spin ◽  
Single Particle ◽  
Spin States ◽  
Quadrupole Moments ◽  
Excitation Energies ◽  
High Spin States ◽  
Vibrational Excitations

Rotationally single-particle and vibrational excitations of deformable odd nuclei with small nonaxiality are investigated with allowance for the interaction of collective and single-particle states. The ratios of excitation energies, of reduced probabilities of E2 transitions, and of quadrupole moments for deformable odd nuclei with small nonaxiality are calculated up to high-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.

ROTATIONAL STATES IN DEFORMED EVEN–EVEN NUCLEI

1967 ◽  
Vol 45 (11) ◽  
pp. 3521-3532 ◽  
Author(s):  
Raj K. Gupta
Keyword(s):  
Energy Levels ◽  
Spin States ◽  
Coupling Constant ◽  
Rotational States ◽  
Rotational Bands ◽  
High Spin States ◽  
Oscillator Type ◽  
The Moment ◽  
Vibration Coupling ◽  
Good Agreement

The deviations from the simple I(I + 1) dependence of the energy levels in the ground-state rotational bands on the hydrodynamical model of Bohr and Mottelson have been investigated for both regions of stable deformation. An interpretation of high spin states is looked for in terms of a nonrigid rotator with vibrations (harmonic oscillator type) taken as perturbation. In the framework of this model, the energy expression is obtained as a power series in the product of the ratio B/A and the weight factor I(I + 1), where A is related to the moment of inertia and B is the rotation–vibration coupling constant. The calculations are shown to be in good agreement with the experimental data.

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