Theoretical Study of Signature-splitting and Signature-inversion in Doubly-odd Nuclei in A∼80 Mass Region

A particle rotor model with a quasi-neutron coupled with a triaxially deformed rotor is applied to study signature splitting for bands with intruder orbital ν7/2+[633] and nonintruder orbital ν5/2-[512] in 173 W . Excellent agreement with the observed energy spectra has been achieved for both bands. Signature splitting for band ν7/2+[633], and band ν5/2-[512] before the onset of signature inversion, is satisfactorily reproduced by introducing the γ degree of freedom. The phase and amplitude of signature splitting in band ν5/2-[512] are attributed to strong competition between 2f7/2 and 1h9/2 components. However, the self-consistent explanation of signature inversion in band ν5/2-[512] is beyond the present one quasi-neutron coupled with a triaxially deformed rotor.

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SIGNATURE INVERSION IN ODD-ODD NUCLEI IN THE MASS REGION A 100

International Journal of Modern Physics E ◽

10.1142/s0218301303001144 ◽

2003 ◽

Vol 12 (01) ◽

pp. 59-64 ◽

Cited By ~ 3

Author(s):

RENRONG ZHENG ◽

SHUNQUAN ZHU ◽

XIANGDONG LUO

Keyword(s):

Coriolis Force ◽

Mass Region ◽

Signature Inversion ◽

Calculation Results ◽

Low K ◽

Universal Mechanism

With the model of a rotor plus two quasi-particles, the signature inversion (SI) in two odd-odd nuclei 102Rh and 98Rh in the mass region A 100 is studied. The calculation results show that the possible SI mechanism, which has been confirmed by the calculation of odd-odd nuclei in the A 160 and A 80 regions (i.e., the competition between the n–p interaction and the coriolis force in low K space) is also appropriate for odd-odd nuclei in the A 100 region. This seems to indicate that there might be a universal mechanism of SI in odd-odd nuclei for different mass regions.

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Theoretical study of the isomeric cross section of the 197Au(n,2n) reaction

HNPS Proceedings ◽

10.12681/hnps.2532 ◽

2019 ◽

Vol 18 ◽

pp. 13

Author(s):

A. Tsinganis ◽

M. Diakaki ◽

M. Kokkoris ◽

A. Lagoyannis ◽

C. T. Papadopoulos ◽

...

Keyword(s):

Cross Section ◽

Cross Sections ◽

Isomeric State ◽

Level Scheme ◽

Reaction Cross Section ◽

Theoretical Study ◽

Strong Dependence ◽

Mass Region ◽

Reaction Cross ◽

Theoretical Results

In the present work, the 197Au(n,2n) reaction cross section is studied within the framework of the Gen- eralized Superfluid Model (GSM). The cross sections for the population of the second isomeric state (12−) of 196Au and the sum of the ground (2−) and first isomeric state (5−) population cross sections were independently studied in the 8 to 25 MeV region with the use of the STAPRE-F, EMPIRE and TALYS codes, which were also compared in their implementation of the GSM. The theoretical results are compared with previous work in the same mass region and the strong dependence on the level scheme of the nuclei involved was revealed.

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Theoretical study of neutron-rich 107,109,111,113Rh isotopes

International Journal of Modern Physics E ◽

10.1142/s0218301315500767 ◽

2015 ◽

Vol 24 (10) ◽

pp. 1550076 ◽

Cited By ~ 2

Author(s):

Amit Kumar ◽

Suram Singh ◽

S. K. Khosa ◽

Arun Bharti ◽

G. H. Bhat ◽

...

Keyword(s):

Theoretical Study ◽

Transition Probabilities ◽

Mass Region ◽

Yrast Band ◽

Projection Technique ◽

Projected Shell Model ◽

Quasi Particle ◽

Angular Momentum Projection ◽

Reduced Transition Probabilities ◽

First Time

A theoretical study of the structure of some odd mass Rh nuclei in the A ~ 100 mass region is carried out by using the angular momentum projection technique implemented in the projected shell model (PSM). The influence of the high-j orbitals (h11/2 for neutrons and g9/2 for protons) on the structure of 107–113Rh isotopes is investigated in the present case by assuming an axial symmetry in the deformed basis. For these isotopes, the structure of multi-quasi-particle qp bands is studied along the yrast line in detail. Further, the phenomenon of back-bending is also studied theoretically and is found to be in agreement with the experimental data. The reduced transition probabilities, i.e., B(E2) and B(M1) for the yrast band are also obtained from the PSM wave functions for the first time, thereby providing an opportunity for the experimentalists to work for this data.

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A SEMI-CLASSICAL APPROACH TO SIGNATURE SPLITTING AND SIGNATURE INVERSION IN ODD–ODD NUCLEI

International Journal of Modern Physics E ◽

10.1142/s0218301311018447 ◽

2011 ◽

Vol 20 (06) ◽

pp. 1455-1463 ◽

Cited By ~ 2

Author(s):

VINOD KUMAR ◽

SURESH KUMAR ◽

SUSHIL KUMAR ◽

ZAFRUL HASAN ◽

BIPIN SINGH KORANGA ◽

...

Keyword(s):

Particle Model ◽

Spin States ◽

Classical Approach ◽

Axially Symmetric ◽

Triaxial Deformation ◽

Deformed Nuclei ◽

Signature Splitting ◽

Rotational Bands ◽

Signature Inversion ◽

Symmetric Rotor

The signature inversion observed in rotational bands belonging to high-j configurations of odd–odd deformed nuclei has been analyzed within the framework of an axially symmetric rotor plus two-particle model. The Coriolis and n–p interaction are considered the main cause of energy staggering. However, γ-triaxial deformation and the numbers of valence protons, Np, and neutrons, Nn also contribute to the energy staggering between odd- and even-spin states.

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Identification of the $\nu_{\frac 32}-[521]$ Band in 153Nd and the γ-Transitions in 149Nd

International Journal of Modern Physics E ◽

10.1142/s0218301397000226 ◽

1997 ◽

Vol 06 (02) ◽

pp. 331-339 ◽

Cited By ~ 10

Author(s):

J. K. Hwang ◽

A. V. Ramayya ◽

J. H. Hamilton ◽

J. Kormicki ◽

L. K. Peker ◽

...

Keyword(s):

Spontaneous Fission ◽

Mass Region ◽

Signature Splitting ◽

Ground Band ◽

N 93 ◽

The One ◽

First Time

From an experiment with Gammasphere and a 252 C spontaneous fission source, two bands with signatures -i and +i are identified in 153 Nd Also several new transitions in 149 Nd are observed for the first time. The band with signature -i in 153 Nd shows no back bending, similar to the one observed in 161 Er . The signature splitting observed in the ground band of 153 Nd is similar to the ones observed in N=93 isotones in this mass region. In 149 Nd the new transitions are placed into a band with a proposed configuration of [Formula: see text].

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