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.

Resonances in the 15N(α,γ)19F Reaction Between Eα = 1.68 and 2.72 MeV

1972 ◽  
Vol 50 (20) ◽  
pp. 2428-2443 ◽  
Author(s):  
D. W. O. Rogers ◽  
R. P. Beukens ◽  
W. T. Diamond
Keyword(s):  
Shell Model ◽  
Weak Coupling ◽  
Coupling Model ◽  
Branching Ratios ◽  
Negative Parity ◽  
Angular Distributions ◽  
Model Calculations ◽  
Spin Parity ◽  
The Third

Using the 15N(α,γ)19F reaction, the properties of 6 levels between 5.3 and 6.2 MeV in 19F have been studied. In conjunction with previously reported restrictions on spins for these levels, measurements of branching ratios, radiative widths, and angular distributions have been used to make the following spin–parity assignments; 5618 keV, 3/2−; 5938 keV, 1/2+; 6070 keV, 7/2+; 6088 keV, 3/2−; 6160 keV, 7/2−. The properties of these levels and that at 5336 keV have been compared in detail to the various shell model calculations done for 19F. The properties of the third Jπ = 7/2+ level at 6.07 MeV can be used to clear up some of the confusion caused by the first two Jπ = 7/2+ levels in 19F and the properties of the Jπ = 3/2− levels confirm the fact that the weak coupling model does not explain the negative parity states outside the K = 1/2− band.

Shell model calculations for odd-mass A = 51–55 nuclei using a weak-coupling basis

1976 ◽  
Vol 54 (16) ◽  
pp. 1683-1691 ◽  
Author(s):  
H. G. Benson ◽  
I. P. Johnstone
Keyword(s):  
Shell Model ◽  
Weak Coupling ◽  
Coupling Model ◽  
Excitation Energies ◽  
Model Calculations ◽  
Neutron Hole

The excitation energies of states belonging to various n1-particle. n2-hole configurations relative to a 56,Ni core are calculated, using, when necessary, truncation based on a weak-coupling model. The calculations account for the occurrence of low-lying five-hole states in 53Mn, reproduce the bands of neutron–hole states observed in 53Cr and 53Fe, and predict the existence of low-lying four-hole states in 55Co.

scholarly journals Large Scale Shell Model Calculations of the Negative-Parity States Structure in 24Mg Nucleus

2021 ◽  
Vol 66 (4) ◽  
pp. 293
Author(s):  
A.A. Al-Sammarraie ◽  
F.A. Ahmed ◽  
A.A. Okhunov
Keyword(s):  
Shell Model ◽  
Large Scale ◽  
Transition Probabilities ◽  
Transition Probability ◽  
Energy Levels ◽  
Form Factors ◽  
Model Space ◽  
Negative Parity ◽  
Matrix Elements ◽  
Model Calculations

The negative-parity states of 24Mg nucleus are investigated within the shell model. We are based on the calculations of energy levels, total squared form factors, and transition probability using the p-sd-pf (PSDPF) Hamiltonian in a large model space (0 + 1) hW. The comparison between the experimental and theoretical states showed a good agreement within a truncated model space. The PSDPF-based calculations successfully reproduced the data on the total squared form factors and transition probabilities of the negative-parity states in 24Mg nucleus. These quantities depend on the one-body density matrix elements that are obtained from the PSDPF Hamiltonian. The wave functions of radial one-particle matrix elements calculated with the harmonic-oscillator potential are suitable to predict experimental data by changing the center-of-mass corrections.

SHAPE EVOLUTION OF HIGHLY DEFORMED 75Kr AND PROJECTED SHELL MODEL DESCRIPTION

2010 ◽  
Vol 19 (08n09) ◽  
pp. 1754-1762 ◽  
Author(s):  
YING-CHUN YANG ◽  
YANG SUN ◽  
T. TRIVEDI ◽  
R. PALIT ◽  
J. A. SHEIKH
Keyword(s):  
Shell Model ◽  
Negative Parity ◽  
Model Description ◽  
Shape Evolution ◽  
Quadrupole Moments ◽  
Projected Shell Model ◽  
Model Calculations ◽  
High Spin States ◽  
Parity Band ◽  
Insight Into

A study of recently-measured high spin states of 75 Kr is carried out by using the Projected Shell Model. Calculations are performed up to spin I = 33/2 for the positive parity band and I = 27/2 for the negative parity band. Irregularities found in moment of inertia and in the deduced transition quadrupole moments Q t of the two bands are discussed in terms of the alignment of g 9/2 protons. Our study provides an insight into the shape evolution of the well-deformed nucleus 75 kr .

A weak-coupling model for the even Zn isotopes

1977 ◽  
Vol 55 (10) ◽  
pp. 909-915 ◽  
Author(s):  
T. Vo-Van ◽  
S. S. M. Wong
Keyword(s):  
Proton Transfer ◽  
Weak Coupling ◽  
Level Structure ◽  
Coupling Model ◽  
Transition Rates ◽  
Vibrational States ◽  
Model Calculations ◽  
Zinc Isotopes ◽  
Protons And Neutrons ◽  
Zn Isotopes

The low-lying structures of even zinc isotopes are studied as the weak coupling of vibrational states of protons and neutrons obtained from shell-model calculations. In spite of its simplicity, the model is capable of describing the known level structure and E2 transition rates as well as producing reliable two-proton transfer amplitudes. Extensions to include other even–even nuclei such as Ge, Se, and Kr are also discussed.

scholarly journals Energy Spectrum of 51V by the Intermediate Coupling Approach

1974 ◽  
Vol 27 (2) ◽  
pp. 289 ◽  
Author(s):  
Woon-Hyuk Chung
Keyword(s):  
Energy Spectrum ◽  
Shell Model ◽  
Strong Coupling ◽  
Energy Levels ◽  
Coupling Model ◽  
Intermediate Coupling ◽  
Rotational Model ◽  
Model Calculations ◽  
Coupling Approach ◽  
Intermediate Coupling Model

In recent years the nucleus 51 Y has been extensively studied, both experimentally by Horoshko et al. (1970), using the 48Ti(oc, py)51y reaction, and theoretically in terms of shell model calculations by many authors (McCullen et al. 1964; Horoshko et al. 1970; Lips and McEllistrem 1970). Mixed configuration shell model calculations by Lips and McEllistrem, in particular, have successfully reproduced the low-lying energy levels of5ly. However, strong coupling rotational model calculations by Malik and Scholz (1966) did not give satisfactory results. In the present work, the intermediate coupling unified model (Bohr and Mottelson 1953; Choudhury 1954) is applied to Sly. The purpose of this work is to show that the intermediate coupling model can successfully predict the low-lying energy levels of Sly.

Study of odd mass 115−125Sb isotopes with the projected shell model calculations

2017 ◽  
Vol 26 (06) ◽  
pp. 1750041 ◽  
Author(s):  
Dhanvir Singh ◽  
Arun Bharti ◽  
Amit Kumar ◽  
Suram Singh ◽  
G. H. Bhat ◽  
...  
Keyword(s):  
Shell Model ◽  
Transition Probabilities ◽  
Negative Parity ◽  
Yrast Band ◽  
Spin States ◽  
Projected Shell Model ◽  
Model Calculations ◽  
High Spin States ◽  
Reduced Transition Probabilities ◽  
First Time

The projected shell model (PSM) with the deformed single-particle states, generated by the standard Nilsson potential, is applied to study the negative-parity high spin states of [Formula: see text] nuclei. The nuclear structure quantities like band structure and back-bending in moment of inertia have been calculated with PSM method and are compared with the available experimental data. In addition, the reduced transition probabilities, i.e., B[Formula: see text] and B[Formula: see text], are also obtained for the yrast band of these isotopes for the first time by using PSM wave function. A multi-quasiparticle structure has been predicted for [Formula: see text] isotopes by the present PSM calculations.

Sign in / Sign up

Export Citation Format

Share Document