Total Routhian surface calculations to study the abrupt band termination phenomenon in 121,123I

2020 ◽  
Vol 29 (08) ◽  
pp. 2050055 ◽  
Author(s):  
S. Ganguly ◽  
S. Chakraborty ◽  
C. Majumder ◽  
S. S. Tiwary ◽  
H. P. Sharma
Keyword(s):  
Sudden Change ◽  
Negative Parity ◽  
Experimental Information ◽  
Angular Frequency ◽  
Quadrupole Moments ◽  
Deformation Parameters ◽  
Prolate Shape ◽  
Lower Spin ◽  
Total Routhian Surface ◽  
Band Termination

The phenomenon of abrupt band termination in [Formula: see text]I has been revisited in the light of total Routhian surface (TRS) calculations. Both axial ([Formula: see text]) and nonaxial ([Formula: see text]) quadrupole deformation parameters have been estimated for the negative parity states. The calculation has also been extended for [Formula: see text]I and the theoretical result has been compared with the available experimental information. The calculated transition quadrupole moments ([Formula: see text]) are matching nicely upto [Formula: see text] MeV. The noncollective oblate shapes become yrast at higher angular frequency in [Formula: see text]I. At lower spin, all of these nuclei exhibit a collective prolate shape. This sudden change in shape at [Formula: see text] is indicative of the loss of collectivity at [Formula: see text]–[Formula: see text] MeV.

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 .

scholarly journals Lifetime measurement and shell model description of negative parity states up to band-termination in 49V

2020 ◽  
Vol 1000 ◽  
pp. 121785
Author(s):  
S. Mukhopadhyay ◽  
D.C. Biswas ◽  
L.S. Danu ◽  
R. Chakrabarti ◽  
U. Garg ◽  
...  
Keyword(s):  
Shell Model ◽  
Negative Parity ◽  
Lifetime Measurement ◽  
Model Description ◽  
Band Termination

Spectroscopy and reduced transition probabilities of negative parity bands up to band termination in 45 Ti

2009 ◽  
Vol 33 (S1) ◽  
pp. 67-69 ◽  
Author(s):  
Ma Hai-Liang ◽  
Yan Yu-Liang ◽  
Zhang Xi-Zhen ◽  
Zhou Dong-Mei ◽  
Dong Bao-Guo
Keyword(s):  
Transition Probabilities ◽  
Negative Parity ◽  
Reduced Transition Probabilities ◽  
Band Termination

scholarly journals CALCULATIONS OF RADII FOR STRONTIUM ISOTOPES( 78-100SR) USING DEFORMATION COEFFICIENTS

2021 ◽  
Vol 03 (02) ◽  
pp. 92-99
Author(s):  
Israa Mudher HASSAN ◽  
Sameera Ahmed EBRAHIEM
Keyword(s):  
Transition Probability ◽  
Three Dimensional ◽  
Strontium Isotopes ◽  
Electric Quadrupole ◽  
Quadrupole Moments ◽  
Mean Square ◽  
Two Dimensional ◽  
Axially Symmetric ◽  
Deformation Parameters ◽  
The Difference

In this study, to calculate the isotope radii of strontium ( 78-100Sr), the deformation coefficients which depend on (b2,d) and the root mean square radius ( )are calculated. The main and secondary elliptical parts( a, b) , with the difference between them (ΔR)are taken. These parameters are calculated for the even-paired of78-100Sr isotopes (Z =38).The low transition probability B(E2) and the deformation parameters δ which in turn depend on the electric quadrupole moments arecalculated using the equations of the deformed coat model. The variety of shapes of the nuclei for the selected isotopes is observed by drawing three-dimensional (axially symmetric) shapes and two-dimensional shapes of strontium isotopes to distinguish between them using quasi-large (a) and quasi-small (b) Axes.

scholarly journals CHIRALITY IN NUCLEAR STRUCTURE: AN EXPERIMENTAL VIEW INTO UNDERLYING SYMMETRIES

2006 ◽  
Vol 15 (08) ◽  
pp. 1897-1898
Author(s):  
C. M. PETRACHE
Keyword(s):  
Nuclear Structure ◽  
Branching Ratios ◽  
Experimental Information ◽  
Nuclear Shape ◽  
Quadrupole Moments ◽  
A Value ◽  
Near Degeneracy

The experimental information on the observed nearly degenerate bands in the N = 75 isotones, in particular 134 Pr , which is considered as the best candidate for chiral bands, if critically analyzed, shows that most properties of the bands, in particular the recently measured branching ratios and lifetimes, are in clear disagreement with the interpretation of the two bands as chiral bands. For I = 14 - 18 in 134 Pr , where the observed energies are almost degenerate, a value of 2.0(4) for the ratio of the transition quadrupole moments of the two bands was obtained, which implies a considerable difference in the nuclear shape associated with the two bands. The insufficiency of the near-degeneracy criterion to trace nuclear chirality is clearly emphasized.

NUCLEAR INTRINSIC QUADRUPOLE MOMENTS AND DEFORMATION PARAMETERS

1970 ◽  
Vol 7 (5) ◽  
pp. 495-564 ◽  
Author(s):  
K.E.G. LÖBNER ◽  
M. VETTER ◽  
V. HÖNIG
Keyword(s):  
Quadrupole Moments ◽  
Deformation Parameters

GLOBAL TRENDS IN THE LOWEST POSITIVE- AND NEGATIVE-PARITY LEVELS OF p- AND sd-SHELL NUCLEI

2005 ◽  
Vol 14 (06) ◽  
pp. 845-881 ◽  
Author(s):  
P. O. HESS ◽  
G. LÉVAI
Keyword(s):  
Systematic Study ◽  
Ground State ◽  
Pauli Principle ◽  
Energy Difference ◽  
Negative Parity ◽  
Quadrupole Moments ◽  
Opposite Parity ◽  
Global Trends ◽  
Global Properties ◽  
Experimental Values

A schematic but systematic study is presented for p- and sd-shell nuclei to investigate the position of the first opposite-parity state relative to the ground state. This approach rests on the assumption that a probe using a dominant quadrupole-quadrupole interaction and observing the Pauli principle is sufficient to trace qualitatively the position of these states. It is argued that even if the SU (3) symmetry is broken, the lowest states in each shell have contributions from the dominant SU (3) states only, and therefore their relative energies are not influenced significantly by the mixing. It is shown that the global properties and trends of the above-mentioned energy difference are governed by the allowed SU (3) configurations including a pronounced odd-even staggering effect. In some regions, strongly prolate 2ℏω states are found to appear at energies comparable to that of 0ℏω states, indicating that in realistic calculations mixing to excited configurations might become important, and this can explain the anomalous properties of some neutron-rich nuclei. An analysis of the available quadrupole moments is also presented, and a qualitative agreement between calculated and experimental values is found.

scholarly journals Calculation of quadrupole deformation parameter β2 from reduced transition probability B(E2) for 0+1 → 2+1 transitions at even-even 62-68Zn isotopes

2021 ◽  
Vol 22 (1) ◽  
pp. 30-41
Author(s):  
Fatema Hameed Obeed ◽  
Ali Khalaf Hasan
Keyword(s):  
Transition Probabilities ◽  
Transition Probability ◽  
Energy Levels ◽  
Complete Agreement ◽  
Quadrupole Moments ◽  
Core Nucleus ◽  
Model Calculations ◽  
Deformation Parameters ◽  
Electric Transition ◽  
Experimental Values

In this work the excited energy levels, reduced transition probabilities B(E2)↑, intrinsic quadrupole moments, and deformation parameters have been calculated for 62-68Zn isotopes with neutrons number N = 32, 34, 36 and 38. NuSheIIX code has been applied for all energy states of fp-shell nuclei. Shell-model calculations for the zinc isotopes have been carried out with active particles distributed in the lp3/2, 0f5/2, and lp1/2 orbits outside doubly magic closed 56Ni core nucleus. By using f5p model space and f5pvh interaction, the theoretical results have been obtained and compared with the available experimental results. The excited energies values, electric transition probability B(E2), intrinsic quadrupole moment Q0, and deformation parameters β2 have appeared in complete agreement with the experimental values. As well as, the energy levels have been confirmed and determined for the angular momentum and parity of experimental values that have not been well established and determined experimentally. On the other hand, it has been predicted some of the new energy levels and electric transition probabilities for the 62-68Zn isotopes under this study which were previously unknown in experimental information.

scholarly journals Quadrupole Moments and Deformation Parameters of the166-180Hf,180-186W and152-168Sm Isotopes

2015 ◽  
Vol 128 (2B) ◽  
pp. B-254-B-257 ◽  
Author(s):  
F. Ertuğral ◽  
E. Guliyev ◽  
A.A. Kuliev
Keyword(s):  
Quadrupole Moments ◽  
Deformation Parameters

The value of Electron Microscope studies of imperfect natural diamonds

1990 ◽  
Vol 48 (4) ◽  
pp. 194-195
Author(s):  
J C Walmsley ◽  
A R Lang
Keyword(s):  
Electron Microscope ◽  
Classification Scheme ◽  
Natural Diamond ◽  
Sudden Change ◽  
Growth Conditions ◽  
Diamond Growth ◽  
Major Constituent ◽  
Natural Diamonds ◽  
Type Ia ◽  
Platelet Defects

Interest in the defects and impurities in natural diamond, which are found in even the most perfect stone, is driven by the fact that diamond growth occurs at a depth of over 120Km. They display characteristics associated with their origin and their journey through the mantle to the surface of the Earth. An optical classification scheme for diamond exists based largely on the presence and segregation of nitrogen. For example type Ia, which includes 98% of all natural diamonds, contain nitrogen aggregated into small non-paramagnetic clusters and usually contain sub-micrometre platelet defects on {100} planes. Numerous transmission electron microscope (TEM) studies of these platelets and associated features have been made e.g. . Some diamonds, however, contain imperfections and impurities that place them outside this main classification scheme. Two such types are described.First, coated-diamonds which possess gem quality cores enclosed by a rind that is rich in submicrometre sized mineral inclusions. The transition from core to coat is quite sharp indicating a sudden change in growth conditions, Figure 1. As part of a TEM study of the inclusions apatite has been identified as a major constituent of the impurity present in many inclusion cavities, Figure 2.

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