Proton capture to excited states ofO16:M1,E1, and Gamow-Teller transitions and shell model calculations

1983 ◽  
Vol 27 (5) ◽  
pp. 1837-1865 ◽  
Author(s):  
K. A. Snover ◽  
E. G. Adelberger ◽  
P. G. Ikossi ◽  
B. A. Brown
Keyword(s):  
Shell Model ◽  
Excited States ◽  
Proton Capture ◽  
Model Calculations ◽  
Gamow Teller

FIRST γ-RAY SPECTROSCOPY AND ISOSPIN SYMMETRY STUDY OF THE N = Z - 2 NUCLEUS 44V

2010 ◽  
Vol 25 (21n23) ◽  
pp. 2028-2029 ◽  
Author(s):  
M. J. TAYLOR ◽  
M. A. BENTLEY ◽  
J. BROWN ◽  
R. WADSWORTH ◽  
P.E. KENT ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Shell Model ◽  
Excited States ◽  
State Of The Art ◽  
Isospin Symmetry ◽  
Charge Symmetry Breaking ◽  
Charge Symmetry ◽  
Model Calculations ◽  
Γ Ray ◽  
First Time

Excited states in the Tz = -1 nucleus 44 V have been observed for the first time. The states have been identified through recoil-γ-γ coincidences and comparison with analogue states in the mirror nucleus 44 Sc . Mirror energy differences have been extracted and compared to state-of-the-art fp shell-model calculations which include charge symmetry breaking forces.

scholarly journals Gamow-Teller strengths of some sd-shell nuclei in the shell model framework

2020 ◽  
Vol 66 (3 May-Jun) ◽  
pp. 330 ◽  
Author(s):  
S. M. Obaid ◽  
H. M. Tawfeek
Keyword(s):  
Shell Model ◽  
Model Space ◽  
Transition Strength ◽  
Model Framework ◽  
Model Calculations ◽  
Effective Interactions ◽  
Calculated Distribution ◽  
Gamow Teller ◽  
Sd Model ◽  
Strength Distributions

The nuclear Gamow-Teller (GT) transition strength distributions B(GT)have been studied for some sd-shell nuclei in the (3He, t) charge-exchangereactions. The shell model calculations were performed by employing theUSDA and USDB effective interactions in the sd-model space. The results of B(GT) calculations reproduce the the experimental Gamow-Tellerstrength distributions well, while the calculated distribution of summedGT transition strengths were closely reproduce the observed ones.

Shell model description of the 0+ and 0− excited states in sd shell nuclei

2018 ◽  
Vol 96 (7) ◽  
pp. 774-778 ◽  
Author(s):  
M. Bouhelal ◽  
N. Saidane ◽  
S. Belaid ◽  
F. Haas
Keyword(s):  
Shell Model ◽  
Excited States ◽  
Ground State ◽  
Model Description ◽  
Excitation Energies ◽  
Model Calculations ◽  
The Future

The purpose of this work is to describe, in light of shell model calculations using the PSDPF interaction, the particular states with J = 0 in sd shell nuclei. These states are difficult to observe. It is well known that the ground state in even–even nuclei has Jπ = 0+ and therefore we are interested in describing their first excited [Formula: see text] states. We have also studied the first and second excited 0− states in all sd nuclei. The experimental and theoretical excitation energies of these states were confronted. This study allowed us to make predictions of the existence of [Formula: see text] and (or) [Formula: see text] states in nuclei, which do not possess these states, or to have an idea of their excitation energies for possible experiments in the future.

scholarly journals Gamow-Teller transitions of neutron-rich N = 82, 81 nuclei by shell-model calculations

2021 ◽  
Author(s):  
Noritaka Shimizu ◽  
Tomoaki Togashi ◽  
Yutaka Utsuno
Keyword(s):  
Shell Model ◽  
Large Scale ◽  
Β Decay ◽  
Excitation Energies ◽  
Pauli Blocking ◽  
Model Calculations ◽  
Model Hamiltonian ◽  
R Process ◽  
Gamow Teller ◽  
Valence Proton

Abstract β-decay half-lives of neutron-rich nuclei around N = 82 are key data to understand the r-process nucleosynthesis. We performed large-scale shell-model calculations in this region using a newly constructed shell-model Hamiltonian, and successfully described the low-lying spectra and half-lives of neutron-rich N = 82 and N = 81 isotones with Z = 42 − 49 in a unified way. We found that their Gamow-Teller strength distributions have a peak in the low-excitation energies, which significantly contributes to the half-lives. This peak, dominated by ν0g7/2 → π0g9/2 transitions, is enhanced on the proton deficient side because the Pauli-blocking effect caused by occupying the valence proton 0g9/2 orbit is weakened.

Centre-of-mass effects in the nuclear shell-model

1955 ◽  
Vol 232 (1191) ◽  
pp. 561-566 ◽  
Keyword(s):  
Shell Model ◽  
Excited States ◽  
Nuclear Shell Model ◽  
Centre Of Mass ◽  
Simple Analysis ◽  
Model Calculations ◽  
System A ◽  
Internal Motions ◽  
Central Oscillator ◽  
Nuclear Shell

An examination is made of the possible errors that may arise in nuclear shell-model calculations by failing to separate out centre-of-mass motions from the internal motions of the system; a central oscillator potential is used to make possible a simple analysis. The most important effect is the appearance of spurious states that do not refer to the internal motion at all; these must be considered whenever the state is described by two or more unclosed shells (in the sense of L-S coupling), as, for example, in the excited states of 16 O.

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