Shell-model calculations of isovector electromagnetic transitions and Gamow-Teller beta decays in theN≃28 region

1988 ◽  
Vol 38 (2) ◽  
pp. 1058-1068 ◽  
Author(s):  
Atsushi Yokoyama ◽  
Hisashi Horie
Keyword(s):  
Shell Model ◽  
Electromagnetic Transitions ◽  
Model Calculations ◽  
Beta Decays ◽  
Gamow Teller

EXOTIC ELECTROMAGNETIC TRANSITIONS IN NEUTRON-RICH CARBON ISOTOPES

2009 ◽  
Vol 18 (10) ◽  
pp. 1992-1996 ◽  
Author(s):  
TOSHIO SUZUKI ◽  
TAKAHARU OTSUKA
Keyword(s):  
Shell Model ◽  
Carbon Isotopes ◽  
Magnetic Dipole ◽  
Tensor Force ◽  
Electromagnetic Properties ◽  
Matrix Elements ◽  
Electromagnetic Transitions ◽  
Model Calculations ◽  
Shell Matrix ◽  
Model Hamiltonian

Structure and electromagnetic properties of exotic neutron-rich carbon isotopes are studied by shell model calculations. A p-sd shell model Hamiltonian is modified by enhancing the effects of the tensor force in the p-sd cross shell matrix elements as well as with corrections in the T=1 monopole terms. A considerable suppression of the magnetic dipole (M1) transition in 17 C from the [Formula: see text] state recently observed is found to be well explained by the modified Hamiltonian. The anomalous hindrance of the quadrupole (E2) transitions in 16 C and 18 C is also shown to be reproduced by our new Hamiltonian.

IsovectorE2matrix elements from electromagnetic transitions in thes−dshell: Experiment and shell-model calculations

1982 ◽  
Vol 26 (5) ◽  
pp. 2247-2272 ◽  
Author(s):  
B. A. Brown ◽  
B. H. Wildenthal ◽  
W. Chung ◽  
S. E. Massen ◽  
M. Bernas ◽  
...  
Keyword(s):  
Shell Model ◽  
Electromagnetic Transitions ◽  
Model Calculations

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.

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.

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

Calculations of Gamow–Teller Transition Strengths in fp-Shell Nuclei Using Shell Model

2020 ◽  
pp. 1-5
Author(s):  
Fouad A. Majeed ◽  
Sarah M. Obaid
Keyword(s):  
Shell Model ◽  
Theoretical Calculations ◽  
Model Space ◽  
Exchange Reactions ◽  
Model Calculations ◽  
Effective Interactions ◽  
Mechanisms Of Formation ◽  
Nuclear Structures ◽  
The Individual ◽  
Gamow Teller

The Gamow–Teller (GT) strength transitions in nuclear structures and astrophysical processes proved to be very important to understand the mechanisms of formation of neutron stars and black holes, therefore the GT transitions in the 46Ti→46V, 47Ti→47V, 48Ti→48V, and 50Cr→50Mn charge-exchange reactions have been studied. The shell model calculations have been carried out in the fp-model space without any restrictions using the GXFP1A, KB3G, and FPD6 effective interactions. The calculation of the GT distribution is compared with recent available experimental data. The theoretical calculations are in reasonably good agreement with the experimental GT distributions and with the summed transition strengths B(GT). For the individual transformations we have reached a qualitative agreement, while the measured cumulative transformation strengths are closely matched by the observed ones.

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