Study of signature inversion in 123,125I using Particle Rotor Model calculations

2021 ◽  
pp. 2150062
Author(s):  
Umakant Lamani ◽  
Pragya Das ◽  
S. G. Wahid
Keyword(s):  
Transition Probabilities ◽  
Nuclear Shape ◽  
Positive Parity ◽  
Model Calculations ◽  
Signature Inversion ◽  
Reduced Transition Probabilities ◽  
Rotor Model

The phenomenon of signature inversion in positive parity yrast states of [Formula: see text]I nuclei has been studied using the Particle Rotor Model (PRM) calculations. The experimentally observed signature inversion is well reproduced from the PRM calculations. The change in the value of a triaxial parameter [Formula: see text] was observed after the inversion. The PRM calculations were also used to describe the reduced transition probabilities. The derived change in the value of “[Formula: see text]” (in Lund convention) after inversion is interpreted as the change in nuclear shape from near triaxial to tending towards noncollective oblate.

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.

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.

THEORETICAL INVESTIGATION OF POSITIVE PARITY BAND STRUCTURE OF Y AND Nb ISOTOPES

2012 ◽  
Vol 21 (10) ◽  
pp. 1250081 ◽  
Author(s):  
CHETAN SHARMA ◽  
PREETI VERMA ◽  
SURAM SINGH ◽  
ARUN BHARTI ◽  
S. K. KHOSA
Keyword(s):  
Band Structure ◽  
Transition Probabilities ◽  
Positive Parity ◽  
Energy Splitting ◽  
Shape Evolution ◽  
Projected Shell Model ◽  
Parity Band ◽  
Reduced Transition Probabilities ◽  
Positive Parity Band ◽  
Structure Properties

The positive parity band structure of odd mass neutron-rich 97 – 103 Y and 99 – 105 Nb nuclei has been studied using microscopic technique known as the projected shell model (PSM) with the deformed single-particle states generated by the standard Nilsson potential. The nuclear structure properties like yrast spectra, energy splitting, moment of inertia, rotational frequencies and reduced transition probabilities B(M1) and B(E2) have been calculated and their comparison with the available experimental data has been made. A shape evolution has also been predicted in these isotopes as one moves from 97 Y to 99 Y and 99 Nb to 101 Nb . The PSM calculations also demonstrate the multi-quasiparticle structure in these nuclei.

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.

scholarly journals A Uqp(u2) ROTOR MODEL FOR ROTATIONAL BANDS OF SUPERDEFORMED NUCLEI

1995 ◽  
Vol 04 (02) ◽  
pp. 385-410 ◽  
Author(s):  
R. BARBIER ◽  
J. MEYER ◽  
M. KIBLER
Keyword(s):  
Transition Probabilities ◽  
Rotational Energy ◽  
Energy Spectra ◽  
Rotational Bands ◽  
Deformation Parameters ◽  
Fitting Procedures ◽  
Energy Formula ◽  
Reduced Transition Probabilities ◽  
Two Parameter ◽  
Rotor Model

A nonrigid rotor model is developed from the two-parameter quantum algebra Uqp(u2). (This model presents the Uqp(u2) symmetry and shall be refered to as the qp-rotor model.) A rotational energy formula as well as a qp-deformation of E2 reduced transition probabilities are derived. The qp-rotor model is applied (through fitting procedures) to twenty rotational bands of superdeformed nuclei in the A~130, 150, and 190 mass regions. Systematic comparisons between the qp-rotor model and the q-rotor model of Raychev, Roussev, and Smirnov, on one hand, and a basic three-parameter model, on the other, are performed on energy spectra, on dynamical moments of inertia and on B(E2) values. The physical significance of the deformation parameters q and p is discussed.

CHARACTERISTICS OF TWO-QUASIPARTICLE CHIRAL BANDS

2011 ◽  
Vol 20 (02) ◽  
pp. 358-363
Author(s):  
OBED SHIRINDA ◽  
ELENA LAWRIE
Keyword(s):  
Transition Probabilities ◽  
Broken Symmetry ◽  
Angular Momenta ◽  
Collective Rotation ◽  
Reduced Transition Probabilities ◽  
Rotor Model

The two-quasiparticle-plus-triaxial-rotor model was applied to study chiral configurations in the 100, 130 and 190 mass regions. It was shown that in order for a degeneracy in the two-quasiparticle partner bands to occur, one needs mutually orthogonal angular momenta of the odd proton, odd neutron and the collective rotation. The staggering in the B(M1) reduced transition probabilities as an indication of strongly broken symmetry was studied too.

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.

Reduced transition probabilities of vibrational states inGd154−160andHf176−180

1977 ◽  
Vol 15 (5) ◽  
pp. 1671-1678 ◽  
Author(s):  
R. M. Ronningen ◽  
J. H. Hamilton ◽  
A. V. Ramayya ◽  
L. Varnell ◽  
G. Garcia-Bermudez ◽  
...  
Keyword(s):  
Transition Probabilities ◽  
Vibrational States ◽  
Reduced Transition Probabilities

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.

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