scholarly journals Nuclear Systematics in the Interacting Boson (IBA) Model

1980 ◽  
Vol 33 (5) ◽  
pp. 801 ◽  
Author(s):  
I Morrison
Keyword(s):  
Experimental Data ◽  
Phase Transitions ◽  
Nuclear Physics ◽  
Mass Region ◽  
Identical Boson ◽  
Mass Dependence ◽  
Electromagnetic Decay ◽  
Analytical Formulae ◽  
Boson Model ◽  
Boson Approximation

Within the framework of the interacting boson approximation, simple analytical formulae are presented for analysing the mass dependence of particle transfer, inelastic scattering and electromagnetic decay from experimental data in nuclear physics. It is shown that the identical boson model provides a useful tool to correlate the results of these experiments and that the extension to equivalent proton and neutron bosons leads to some new and interesting results in the Pt-Hg mass region, namely the possibility of phase transitions and symmetry breaking.

scholarly journals Study of the properties of Ru-isotopes using the proton-neutron interacting boson model (IBM-2)

2010 ◽  
Vol 7 (1) ◽  
pp. 76-89
Author(s):  
Baghdad Science Journal
Keyword(s):  
Experimental Data ◽  
Dipole Moments ◽  
Electric Quadrupole ◽  
Mass Region ◽  
Interacting Boson Model ◽  
State Transitions ◽  
Quadrupole Moments ◽  
Excitation Energies ◽  
Mixing Ratios ◽  
Boson Model

The proton-neutron interacting boson model (IBM-2) has been used to make a schematic study of the Ruthenium ( ) isotopes of mass region around with and . For each isotope of the values of the IBM-2 Hamiltonian parameters, which yield an acceptable results for excitation energies in comparison with those of experimental data, have been determined. Fixed values of the effective charges ( ) and of the proton and neutron g factors ( and ) have been chosen for all isotopes under study. The calculated electric quadrupole moments of state, transitions, the magnetic dipole moments transitions and mixing ratios are in reasonable agreement with the experimental data.

Energy Levels and Electromagnetic Transition of 90-94mo Nuclei Using Ibm-1

2020 ◽  
pp. 149-152
Keyword(s):  
Experimental Data ◽  
Transition Probability ◽  
Energy Levels ◽  
Dynamical Symmetry ◽  
Interacting Boson Model ◽  
Excitation Energies ◽  
Electromagnetic Transition ◽  
Boson Model ◽  
Energy States ◽  
Good Agreement

The energy states for the J , b , ɤ bands and electromagnetic transitions B (E2) values for even – even molybdenum 90 – 94 Mo nuclei are calculated in the present work of "the interacting boson model (IBM-1)" . The parameters of the equation of IBM-1 Hamiltonian are determined which yield the best excellent suit the experimental energy states . The positive parity of energy states are obtained by using IBS1. for program for even 90 – 94 Mo isotopes with bosons number 5 , 4 and 5 respectively. The" reduced transition probability B(E2)" of these neuclei are calculated and compared with the experimental data . The ratio of the excitation energies of the 41+ to 21+ states ( R4/2) are also calculated . The calculated and experimental (R4/2) values showed that the 90 – 94 Mo nuclei have the vibrational dynamical symmetry U(5). Good agreement was found from comparison between the calculated energy states and electric quadruple probabilities B(E2) transition of the 90–94Mo isotopes with the experimental data .

scholarly journals Interaction between Different Kinds of Quantum Phase Transitions

2021 ◽  
Vol 3 (2) ◽  
pp. 253-261
Author(s):  
Angel Ricardo Plastino ◽  
Gustavo Luis Ferri ◽  
Angelo Plastino
Keyword(s):  
Phase Transitions ◽  
Nuclear Physics ◽  
Body Problem ◽  
Quantum Phase Transitions ◽  
Quantum Phase ◽  
Exactly Solvable Models ◽  
Solvable Models ◽  
Many Body ◽  
Pairing Interaction ◽  
Exactly Solvable

We employ two different Lipkin-like, exactly solvable models so as to display features of the competition between different fermion–fermion quantum interactions (at finite temperatures). One of our two interactions mimics the pairing interaction responsible for superconductivity. The other interaction is a monopole one that resembles the so-called quadrupole one, much used in nuclear physics as a residual interaction. The pairing versus monopole effects here observed afford for some interesting insights into the intricacies of the quantum many body problem, in particular with regards to so-called quantum phase transitions (strictly, level crossings).

scholarly journals Two-neutron separation energies, binding energies and phase transitions in the interacting boson model

2001 ◽  
Vol 688 (3-4) ◽  
pp. 735-754 ◽  
Author(s):  
J.E. García-Ramos ◽  
C. De Coster ◽  
R. Fossion ◽  
K. Heyde
Keyword(s):  
Phase Transitions ◽  
Binding Energies ◽  
Interacting Boson Model ◽  
Boson Model

Phase transitions and the geometric properties of the interacting boson model

1981 ◽  
Vol 23 (3) ◽  
pp. 1254-1258 ◽  
Author(s):  
Da Hsuan Feng ◽  
Robert Gilmore ◽  
S. R. Deans
Keyword(s):  
Phase Transitions ◽  
Interacting Boson Model ◽  
Geometric Properties ◽  
Boson Model

ON AN ORIENTATION TRANSITION IN NEMATIC LIQUID CRYSTALS INDUCED BY THE THICKNESS OF THE SAMPLE

1993 ◽  
Vol 07 (18) ◽  
pp. 1215-1222
Author(s):  
A. L. ALEXE-IONESCU
Keyword(s):  
Experimental Data ◽  
Phase Transitions ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Tilt Angle ◽  
Critical Thickness ◽  
Large Range ◽  
Square Root ◽  
Chiral Molecules ◽  
Homeotropic Orientation

An orientation transition observed in nematic liquid crystal samples, induced by the thickness, is interpreted in a new way. By supposing that the nematic liquid crystal contains chiral impurities, it is shown that the homeotropic orientation is stable only for thicknesses smaller than a critical one, and is dependent on the concentration of the chiral molecules. At the critical thickness, the transition from the homeotropic orientation to the distorted one is characterized by a tilt angle proportional to the square root of the actual thickness minus the critical one. This trend is typical of second order phase transitions. The agreement between the theory and the experimental data is fairly good over a large range of thickness of the sample.

scholarly journals Quantum phase transitions in the two-dimensional hardcore boson model

2001 ◽  
Vol 65 (1) ◽  
Author(s):  
F. Hébert ◽  
G. G. Batrouni ◽  
R. T. Scalettar ◽  
G. Schmid ◽  
M. Troyer ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Quantum Phase Transitions ◽  
Quantum Phase ◽  
Two Dimensional ◽  
Boson Model

scholarly journals Mixed Symmetry States in 92Zr and 94Mo Nuclei

2021 ◽  
Vol 66 (12) ◽  
pp. 1013
Author(s):  
S.N. Abood ◽  
A.A. Al-Rawi ◽  
L.A. Najam ◽  
F.M. Al-Jomaily
Keyword(s):  
Experimental Data ◽  
Energy Spectra ◽  
Interacting Boson Model ◽  
Transition Rates ◽  
Collective Models ◽  
Electromagnetic Transition ◽  
Mixed Symmetry ◽  
Mixed Symmetry States ◽  
Boson Model ◽  
Phonon Model

Mixed-symmetry states of 92Zr and 94Mo isotopes are investigated with the use of the collective models, Interacting Boson Model-2 (IBM-2) and Quasiparticle Phonon Model (QPM). The energy spectra and electromagnetic transition rates for these isotopes are calculated. The results of IBM-2 and QPM are compared with available experimental data. We have obtained a satisfactory agreement, and IBM-2 gives a better description. In these isotopes, we observe a few states having a mixed symmetry such as 2+2, 2+3, 3+1, and 1+s. It is found that these isotopes have a vibrational shape corresponding to the U(5) symmetry.

УДАЛЕННЫЙ ПРАКТИКУМ ПО АТОМНОЙ И ЯДЕРНОЙ ФИЗИКЕ ДЛЯ ШКОЛЬНИКОВ: УСПЕХИ И СЛОЖНОСТИ

2021 ◽  
Author(s):  
В.В. Радченко ◽  
Е.В. Борисова ◽  
А.А. Брусницын ◽  
И.М. Зверева ◽  
Э.И. Кэбин ◽  
...  
Keyword(s):  
Experimental Data ◽  
High School ◽  
High School Students ◽  
Nuclear Physics ◽  
Practical Work ◽  
School Students

Описывается опыт проведения виртуальных и удаленных практических работ по атомной и ядерной физике со старшеклассниками. Обсуждаются разные методы обработки экспериментальных результатов. The experience of virtual and remote practical work on atomic and nuclear physics with high school students is described. Different methods for analysis of experimental data are discussed.

Shape coexistence in $^{76}$Se within the neutron-proton interacting boson model

2021 ◽  
Author(s):  
Chengfu Mu ◽  
Dali Zhang
Keyword(s):  
Experimental Data ◽  
Energy Spectrum ◽  
Excitation Energy ◽  
Energy Levels ◽  
Spherical Shape ◽  
Interacting Boson Model ◽  
Shape Coexistence ◽  
Electromagnetic Transition ◽  
Boson Model ◽  
Good Agreement

Abstract We have investigated the low-lying energy spectrum and electromagnetic transition strengths in even-even $^{76}$Se using the proton-neutron interacting boson model (IBM-2). The theoretical calculation for the energy levels and $E2$ and $M1$ transition strengths is in good agreement with the experimental data. Especially, the excitation energy and $E2$ transition of $0^+_2$ state, which is intimately associated with shape coexistence, can be well reproduced. The analysis on low-lying states and some key structure indicators indicates that there is a coexistence between spherical shape and $\gamma$-soft shape in $^{76}$Se.

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