scholarly journals Possible Nuclear Structure Effects in Even-Even Osmium Nuclei

1974 ◽  
Vol 29 (8) ◽  
pp. 1125-1130 ◽  
Author(s):  
E. Bashandy ◽  
M. S. El-Nesr
Keyword(s):  
Nuclear Structure ◽  
Internal Conversion ◽  
Transition Probabilities ◽  
Branching Ratio ◽  
Conversion Process ◽  
Mixing Ratio ◽  
Model Calculations ◽  
Conversion Coefficients ◽  
Series Of Experiments ◽  
Reduced Transition Probabilities

A compilation of the multipole mixing of 2′ + → 2 + transitions in 186Os, 188Os, 190Os and 192Os is given. In view of recent results obtained at our laboratory, indicating large anomalies in the conversion process of inhibited M1 transitions, the study has been extended for even-even Osmium nuclei. A series of experiments has been performed in which the conversion coefficients and transition probabilities were measured. The data of 2′ + → 2 + transitions were analysed by taking into account nuclear structure effects on the Ml internal conversion process. The M1 admixtures obtained are compared with Greiner′s calculations. Values of reduced transition probabilities B (E2, 0 → 2 +) , B (E2, 2′+ → 2+) , the mixing ratio δ = 〈2 || E2 || 2′〉 / 〈2 || M1 || 2′〉 and the transition branching ratio T (2′ → 2)/T(2′ → 0) are reported for second and higher 2+ states. The results are compared to the pairing-plus-quadrupole model calculations of Kumar and Baranger.

Band structure of odd-mass lanthanum nuclei

2014 ◽  
Vol 23 (04) ◽  
pp. 1450020
Author(s):  
Deepti Sharma ◽  
Preeti Verma ◽  
Suram Singh ◽  
Arun Bharti ◽  
S. K. Khosa
Keyword(s):  
Band Structure ◽  
Shell Model ◽  
Nuclear Structure ◽  
Transition Probabilities ◽  
Theoretical Data ◽  
Negative Parity ◽  
Projected Shell Model ◽  
Experimental Feature ◽  
Reduced Transition Probabilities ◽  
Structure Properties

Negative parity energy states in 121–131 La have been studied using Projected Shell Model (PSM). Some nuclear structure properties like yrast spectra, back-bending in moment of inertia, reduced transition probabilities and band diagrams have been described. The experimental feature of the co-existence of prolate–oblate shapes in 125–131 La isotopes has been satisfactorily explained by PSM results. Comparison of the theoretical data with their experimental counterparts has also been made. From the calculations, it is found that the yrast states arise because of multi-quasiparticle states.

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.

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.

Level structure studies of 182W from the decay of 182Ta

1992 ◽  
Vol 70 (4) ◽  
pp. 242-251 ◽  
Author(s):  
Bakhshish Chand ◽  
J. Goswamy ◽  
Devinder Mehta ◽  
Nirmal Singh ◽  
P. N. Trehan
Keyword(s):  
Transition Probabilities ◽  
Level Structure ◽  
Correlation Coefficients ◽  
Negative Parity ◽  
X Rays ◽  
Internal Conversion Coefficients ◽  
Symmetric Rotor ◽  
Conversion Coefficients ◽  
Reduced Transition Probabilities ◽  
First Time

The relative intensities of X rays and γ rays from the decay of 182Ta were measured precisely using Si(Li) and HPGe detectors. The intensities of the different components of K and L X rays were measured for the first time. The conversion electron intensities for the transitions with energy above 800 keV from the 182Ta decay were measured using a mini-orange electron spectrometer and the internal conversion coefficients for various transitions in 182W deduced. The (M + N)-conversion coefficients for the 1001.7, 1189.1, 1231.0, 1257.2, 1289.2, and 1342.7 keV transitions in 182W were measured for the first time. Also, γ–γ coincidence and correlation measurements were carried out using a HPGe–HPGe coincidence setup (2τ = 7 ns). The directional correlation coefficients for the 928–229, 960–229, 1002–229, 1044–229, 1158–229, 1223–229, and 1002–222 keV cascades in 182W are determined for the first time. The multipole mixing ratio for the 152, 156, 179, 222, 928, 1002, 1113, 1158, 1223, and 1231 keV transitions are deduced from the present directional correlation and conversion coefficient measurements. Experimental ratios of reduced transition probabilities for the transitions in 182W from positive and negative parity states are deduced and compared with the values predicted by the symmetric rotor model. From this comparison a unique K assignment of Kπ = 1+ and Kπ = 1− is made to the bands built on the 1257 and 1553 keV levels, respectively.

Study of negative parity levels in 63Cu

1980 ◽  
Vol 58 (4) ◽  
pp. 472-480 ◽  
Author(s):  
R.G. Kulkarni ◽  
D. P. Navalkele
Keyword(s):  
Gamma Ray ◽  
Transition Probabilities ◽  
Negative Parity ◽  
Angular Distributions ◽  
Core Excitation ◽  
Model Calculations ◽  
Mixing Ratios ◽  
Reduced Transition Probabilities ◽  
Excitation Model ◽  
First Time

Low-lying negative parity levels in 63Cu were Coulomb excited with 3.25 to 4.25 MeV protons to test the weak coupling core-excitation model. A Ge(Li) detector was used to measure the gamma-ray yields. The 1412, 1547, and 1861 keV levels in 63Cu were Coulomb excited for the first time. Gamma-ray angular distributions were measured at 4.25 MeV proton energy in deducing multipole mixing ratios and spin values. The E2 and M1 reduced transition probabilities were determined for the six states. The 669.6, 962, 1327, and 1547 keV levels have properties consistent with the interpretation of coupling a 2p3/2 proton to the first 2+core state. The present results were compared with the available particle–core and particle–phonon model calculations.

Nuclear structure of low-lying states in 60,62,64,66Zn — A shell model description

2016 ◽  
Vol 25 (11) ◽  
pp. 1650099 ◽  
Author(s):  
S. Rai ◽  
A. Biswas ◽  
B. Mukherjee
Keyword(s):  
Shell Model ◽  
Model Calculation ◽  
Nuclear Structure ◽  
Transition Probabilities ◽  
Model Space ◽  
Shell Model Calculation ◽  
Model Description ◽  
Quadrupole Moments ◽  
Occupation Numbers ◽  
Reduced Transition Probabilities

Shell model calculation has been performed for even–even [Formula: see text]Zn using NuShellX code in [Formula: see text] model space with two different effective Hamiltonians, viz. JUN45 and jj44b. The low-lying structure is studied up to angular momentum, [Formula: see text] = 10[Formula: see text] by calculating level energies, reduced transition probabilities, occupation numbers, lifetimes, and quadrupole moments. The results of the calculations are compared with the available experimental data. It is observed that the inclusion of 1[Formula: see text] orbital in the model space is essential to understand nuclear structure in these isotopes. Shell model calculation with an improved set of effective Hamiltonian parameters and inclusion of [Formula: see text] orbital in the model space are necessary in order to produce finer agreement with the experimental observations.

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