scholarly journals Phases and phase transitions in the algebraic microscopic shell model

2016 ◽  
Vol 107 ◽  
pp. 03010
Author(s):  
A. I. Georgieva ◽  
K. P. Drumev
Keyword(s):  
Phase Transitions ◽  
Shell Model

scholarly journals Nuclear shell model and phase transitions

2017 ◽  
Author(s):  
Sofia Karampagia ◽  
Vladimir Zelevinsky
Keyword(s):  
Phase Transitions ◽  
Shell Model ◽  
Nuclear Shell Model ◽  
Nuclear Shell

scholarly journals Nuclear Shell Model And Quantum Phase Transitions

2019 ◽  
Vol 26 ◽  
pp. 88
Author(s):  
S. Karampagia ◽  
V. Zelevinsky
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Shell Model ◽  
Quantum Phase Transitions ◽  
Mean Field ◽  
Nuclear Shell Model ◽  
Matrix Elements ◽  
Model Hamiltonian ◽  
Orbital Space ◽  
Nuclear Shell

The usual nuclear shell model defines nuclear properties through an effective mean-field plus a two-body interaction Hamiltonian in a finite orbital space. In this study we try to understand the correlation between the various parts of the shell model Hamiltonian and the nuclear observables and collectivity in nuclei. By varying specific groups of matrix elements we find signs of a phase transition in nuclei between a non-collective and a collective phase. In all cases studied the collective phase is attained when the single-particle transfer matrix elements are dominant in the shell model Hamiltonian, giving collective characteristics to nuclei.

SD-PAIR SHELL MODEL FOR EVEN-EVEN SYSTEMS

2008 ◽  
Vol 17 (supp01) ◽  
pp. 245-255
Author(s):  
YAN-AN LUO ◽  
FENG PAN ◽  
JERRY P. DRAAYER ◽  
PING-ZHI NING
Keyword(s):  
Phase Transitions ◽  
Shell Model ◽  
Model Space ◽  
Interacting Boson Model ◽  
Nucleon Pair ◽  
Heavy Nuclei ◽  
Boson Model ◽  
Model Phase ◽  
Medium Weight

A nucleon-pair shell model was proposed in 1993 by J. Q. Chen. Due to the success of the interacting boson model, the full shell model space in the nucleon-pair shell model was truncated to SD-pair subspace, called SD -pair shell model. Within this model, the experimental spectra in medium-weight and heavy nuclei, limiting cases in the interacting boson model, phase transitions, etc. can be reproduced approximately.

Understanding nuclear shape phase transitions within SD-pair shell model

2014 ◽  
Author(s):  
Lei Li ◽  
Yu Zhang ◽  
Xiaoqing Yuan ◽  
Jiangdan Li ◽  
Yanan Luo ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Shell Model ◽  
Nuclear Shape

NUCLEAR SHAPE PHASE TRANSITIONS AT THE NUCLEON LEVEL WITHIN SD-PAIR SHELL MODEL

2016 ◽  
Author(s):  
Lei Li ◽  
Yanan Luo ◽  
Yu Zhang ◽  
Feng Pan ◽  
Jerry P. Draayer
Keyword(s):  
Phase Transitions ◽  
Shell Model ◽  
Nuclear Shape

Electron Microscopy of Graphite Intercalation Compounds

1982 ◽  
Vol 40 ◽  
pp. 544-545
Author(s):  
G. Timp ◽  
L. Salamanca-Riba ◽  
L.W. Hobbs ◽  
G. Dresselhaus ◽  
M.S. Dresselhaus
Keyword(s):  
Electron Microscopy ◽  
Phase Transitions ◽  
Domain Wall ◽  
Intercalation Compounds ◽  
Lattice Plane ◽  
Wall Model ◽  
Graphite Intercalation Compounds ◽  
Fundamental Symmetry ◽  
Graphite Intercalation

Electron microscopy can be used to study structures and phase transitions occurring in graphite intercalations compounds. The fundamental symmetry in graphite intercalation compounds is the staging periodicity whereby each intercalate layer is separated by n graphite layers, n denoting the stage index. The currently accepted model for intercalation proposed by Herold and Daumas assumes that the sample contains equal amounts of intercalant between any two graphite layers and staged regions are confined to domains. Specifically, in a stage 2 compound, the Herold-Daumas domain wall model predicts a pleated lattice plane structure.

Multiple phase transitions investigated by high-speed TEM

1990 ◽  
Vol 48 (4) ◽  
pp. 550-551
Author(s):  
Oleg Bostanjoglo ◽  
Peter Thomsen-Schmidt
Keyword(s):  
Phase Transitions ◽  
High Speed ◽  
Short Exposure ◽  
Semiconductor Film ◽  
Time Resolved ◽  
Short Exposure Time ◽  
Multiple Phase ◽  
Model Substance ◽  
History Of ◽  
Electron Image

Thin GexTe1-x (x = 0.15-0.8) were studied as a model substance of a composite semiconductor film, in addition being of interest for optical storage material. Two complementary modes of time-resolved TEM were used to trace the phase transitions, induced by an attached Q-switched (50 ns FWHM) and frequency doubled (532 nm) Nd:YAG laser. The laser radiation was focused onto the specimen within the TEM to a 20 μm spot (FWHM). Discrete intermediate states were visualized by short-exposure time doubleframe imaging /1,2/. The full history of a transformation was gained by tracking the electron image intensity with photomultiplier and storage oscilloscopes (space/time resolution 100 nm/3 ns) /3/. In order to avoid radiation damage by the probing electron beam to detector and specimen, the beam is pulsed in this continuous mode of time-resolved TEM,too.Short events ( <2 μs) are followed by illuminating with an extended single electron pulse (fig. 1c)

Sign in / Sign up

Export Citation Format

Share Document