scholarly journals A study of the N=28 neutron shell via g-factor measurements in neutron-rich Cl isotopes

2020 ◽  
Vol 16 ◽  
pp. 163
Author(s):  
M. De Rydt ◽  
G. Neyens ◽  
T. J. Mertzimekis ◽  
For the E513 Collaboration at GANIL
Keyword(s):  
Shell Model ◽  
Ground State ◽  
Experimental Results ◽  
Radioactive Beams ◽  
Model Calculations ◽  
Island Of Inversion ◽  
G Factor ◽  
Intermediate Energies ◽  
Open Questions ◽  
Shed Light

A series of g-factor measurements in the Cl isotopes created as secondary radioactive beams at intermediate energies and employing the β-NMR technique have been recently carried out at GANIL. The results attempt to shed light on several open questions for the ground state properties of Cl isotopes, located just off the very interesting region of the island of inversion. Preliminary experimental results are presented and compared to shell-model calculations around N=28.

The 48Ca(α, p) 51Sc reaction; experimental results and shell model calculations

1967 ◽  
Vol 25 (3) ◽  
pp. 206-208 ◽  
Author(s):  
R.O. Ginaven ◽  
A.M. Bernstein ◽  
R.M. Drisko ◽  
J.B. McGrory
Keyword(s):  
Shell Model ◽  
Experimental Results ◽  
Model Calculations

scholarly journals Shell Model calculations of nuclear structure in ʺIsland of inversionʺ N=20 region: 32-36Mg isotopes

2021 ◽  
Vol 67 (5 Sep-Oct) ◽  
Author(s):  
Firas Abed Ahmed
Keyword(s):  
Shell Model ◽  
Nuclear Structure ◽  
Transition Probabilities ◽  
Model Calculations ◽  
Island Of Inversion

The intruder configurations (1p-1h), (2p-2h) and (3p-3h) were studied in this work for the island of inversion within the SDPF-U Hamiltonian. The effect of the proton locations on the structure (energies and transition probabilities) for even-even and even-odd magnesium (N=20-24) isotopes is studied.

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.

SHELL MODEL CALCULATIONS OF 3T, 5He AND 6Li NUCLEI

2002 ◽  
Vol 11 (01) ◽  
pp. 67-70
Author(s):  
NAZIH EL-NOHY
Keyword(s):  
Binding Energy ◽  
Shell Model ◽  
Root Mean Square ◽  
Long Range ◽  
Ground State ◽  
Radial Dependence ◽  
Spin Orbit ◽  
Mean Square ◽  
Model Calculations ◽  
Short Range Repulsion

The bases of the translation invariant shell model are used to construct the ground-state wave functions of 3 T , 5 He and 6 Li . For 3 T the bases used correspond to the number of quanta of excitation N up to ten. For 5 He and 6 Li the bases used correspond to the number of quanta of excitation N up to six. The model is applied to calculate the binding energy and the root mean square radius for 3 T , 5 He and 6 Li nuclei. The residual interactions used consist of central, tensor, spin-orbit and quadratic spin-orbit terms with Gaussian radial dependence. The parameters of these interactions are chosen in such away that they represent the long range attraction and the short range repulsion of nucleon interactions. It was found that this potential is more suitable for calculating the characteristics of these nuclei, and better than other potentials, such as our previous potentials which were represented by the parameters of long range attraction forces only. For 3T we obtained good agreement between calculated and experimental values of both the ground state binding energy and the root mean square radius. For 5 He and 6 Li nuclei we obtained an acceptable improvement with these calculations over other potentials.

scholarly journals Single particle energies and nuclear g factors

2017 ◽  
Vol 26 (09) ◽  
pp. 1750053 ◽  
Author(s):  
Shadow Robinson ◽  
Larry Zamick
Keyword(s):  
Shell Model ◽  
Single Particle ◽  
Ground State ◽  
Particle State ◽  
Complex Interplay ◽  
Model Calculations ◽  
Effective Interactions ◽  
State Splitting ◽  
State Affect ◽  
Nuclear Shell

Adding one neutron to doubly magic [Formula: see text]Sn, we can associate the low lying states in[Formula: see text]Sn with single particle states. Thus, the [Formula: see text] and [Formula: see text] states are identified as the [Formula: see text] and [Formula: see text] single particle states, respectively. In [Formula: see text]Sn, these two low lying states are separated by an energy of 0.172[Formula: see text]MeV. Currently, there is a dispute as to the ordering of these states. We examine how the two scenarios, selecting [Formula: see text] as the ground state or [Formula: see text] as the ground state, affect spectra and nuclear [Formula: see text] factors of higher mass Sn isotopes in a variety of shell model situations. Significantly, this includes examining the complex interplay of the choice of single particle state splitting, effective interactions, and effective [Formula: see text]-factors in nuclear shell model calculations. Of particular importance is how the trends in the calculated results for [Formula: see text] factors diverge from recent experimental measurements for the higher mass isotopes of Sn.

scholarly journals NUCLEAR STRUCTURE STUDY WITH CORE EXCITATIONS IN Ni REGION: FOR fpg9/2 SPACE

2012 ◽  
Vol 27 (13) ◽  
pp. 1250061 ◽  
Author(s):  
P. C. SRIVASTAVA
Keyword(s):  
Shell Model ◽  
Nuclear Structure ◽  
Structure Study ◽  
Experimental Results ◽  
Matrix Elements ◽  
Model Calculations ◽  
Nuclear Structure Study ◽  
Core Excitations ◽  
Cu And Zn ◽  
Zn Isotopes

Shell model calculations for Ni, Cu and Zn isotopes by modifying fpg interaction due to Sorlin et al. [Phys. Rev. Lett. 88, 092501 (2002)] have been reported. In the present work, 28 two-body matrix elements of the earlier interaction have been modified. Present interaction is able to explain new experimental results for this region.

MULTICHANNEL ANALYSIS OF THE 16B NUCLEUS

2011 ◽  
Vol 20 (04) ◽  
pp. 1022-1025
Author(s):  
MARIANNE DUFOUR ◽  
PIERRE DESCOUVEMONT
Keyword(s):  
Shell Model ◽  
Ground State ◽  
Cluster Model ◽  
Model Calculations ◽  
Generator Coordinate Method ◽  
Coordinate Method ◽  
Narrow Peak ◽  
Generator Coordinate ◽  
Multichannel Analysis

This work is devoted to a Generator-Coordinate-Method investigation of the 16 B spectrum with an Extended Two-Cluster Model which includes many 15 B + n channels. We find that the narrow peak above the 15 B + n threshold seen in the experiments of Kalpachieva et al. and of Lecouey et al. can be assigned to a [Formula: see text] resonance. Several resonances are obtained near the 15 B + n threshold, in particular a [Formula: see text] state which could be a possible candidate for the 16 B ground state. Comparison with Shell Model calculations is performed.

Schalenmodellrechnungen beim Kern O18 mit geschwindigkeitsabhängigen Zwei-Teilchen-Potentialen

1967 ◽  
Vol 22 (4) ◽  
pp. 415-421
Author(s):  
Hans Grote
Keyword(s):  
Experimental Data ◽  
Harmonic Oscillator ◽  
Shell Model ◽  
Interaction Potential ◽  
Ground State ◽  
Wave Functions ◽  
Absolute Position ◽  
Model Calculations ◽  
The Core ◽  
Free Parameters

The energies of the low lying levels and the absolute position of the ground state of the nucleus O18 are calculated using five velocity-dependent potentials. The calculation is based on the shell model with two outer neutrons in the potential of the Ο16 core. The interaction potential as well as the core potential are fitted to experimental data, leaving no free parameters in the final result.The wave functions of the harmonic oscillator are used in each case of the five velocity-dependent potentials. An additional computation is carried out using one of these potentials and taking into account the perturbation of the wave functions. It turns out that, for satisfactory application of the velocity-dependent potentials in shell model calculations, this perturbation should be considered.

scholarly journals New levels in spherical 96Y

2018 ◽  
Vol 27 (06) ◽  
pp. 1850051
Author(s):  
E. H. Wang ◽  
J. H. Hamilton ◽  
A. V. Ramayya ◽  
R. Han ◽  
C. J. Zachary ◽  
...  
Keyword(s):  
Experimental Data ◽  
Shell Model ◽  
Large Deformation ◽  
Ground State ◽  
Spontaneous Fission ◽  
Detector Array ◽  
Model Calculations ◽  
Coincidence Data ◽  
Excited Band ◽  
Good Agreement

New transitions in neutron rich [Formula: see text]Y have been identified by analyzing the high statistics [Formula: see text]-[Formula: see text]-[Formula: see text] and [Formula: see text]-[Formula: see text]-[Formula: see text]-[Formula: see text] coincidence data from the spontaneous fission of [Formula: see text]Cf at the Gammasphere detector array. Shell model calculations were performed and are found in good agreement with experimental data. The ground state is nearly spherical but a new excited band has large deformation.

scholarly journals Single-Particle and Collective Structures in Neutron-Rich Sr Isotopes

Universe ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 23
Author(s):  
Kamila Sieja
Keyword(s):  
Shell Model ◽  
Ground State ◽  
Experimental Studies ◽  
Low Energy ◽  
Model Description ◽  
Sr Isotopes ◽  
Model Calculations ◽  
Spectroscopic Factors ◽  
Monte Carlo Shell Model ◽  
Insight Into

Neutron-rich Sr nuclei around N=60 exhibit a sudden shape transition from a spherical ground state to strongly prolate-deformed. Recently, much new insight into the structure of Sr isotopes in this region has been gained through experimental studies of the excited levels, transition strengths, and spectroscopic factors. In this work, a “classic” shell model description of strontium isotopes from N=50 to N=58 is provided, using a natural valence space outside the 78Ni core. Both even–even and even–odd isotopes are addressed. In particular, spectroscopic factors are computed to shed more light on the structure of low-energy excitations and their evolution along the Sr chain. The origin of deformation at N=60 is mentioned in the context of the present and previous shell model and Monte Carlo shell model calculations.

Sign in / Sign up

Export Citation Format

Share Document