Determination of Nuclear Level Densities at an Excitation Energy of 20 MeV

1965 ◽  
Vol 138 (6B) ◽  
pp. B1372-B1377 ◽  
Author(s):  
H. K. Vonach ◽  
J. R. Huizenga
Keyword(s):  
Excitation Energy ◽  
Nuclear Level ◽  
Level Densities

scholarly journals Determination of the nuclear level densities and radiative strength function for 43 nuclei in the mass interval 28≤A≤200

2018 ◽  
Vol 169 ◽  
pp. 00007
Author(s):  
David Knezevic ◽  
Nikola Jovancevic ◽  
Anatoly M. Sukhovoj ◽  
Ludmila V. Mitsyna ◽  
Miodrag Krmar ◽  
...  
Keyword(s):  
Nuclear Physics ◽  
Good Description ◽  
Strength Function ◽  
Mass Region ◽  
Nuclear Level ◽  
Characteristic Structure ◽  
Level Densities ◽  
Practical Model ◽  
Strength Functions

The determination of nuclear level densities and radiative strength functions is one of the most important tasks in low-energy nuclear physics. Accurate experimental values of these parameters are critical for the study of the fundamental properties of nuclear structure. The step-like structure in the dependence of the level densities p on the excitation energy of nuclei Eex is observed in the two-step gamma cascade measurements for nuclei in the 28 ≤ A ≤ 200 mass region. This characteristic structure can be explained only if a co-existence of quasi-particles and phonons, as well as their interaction in a nucleus, are taken into account in the process of gamma-decay. Here we present a new improvement to the Dubna practical model for the determination of nuclear level densities and radiative strength functions. The new practical model guarantees a good description of the available intensities of the two step gamma cascades, comparable to the experimental data accuracy.

Parity equilibration in nuclear level densities of 159–166Dy

2020 ◽  
Vol 35 (38) ◽  
pp. 2050315
Author(s):  
R. Razavi ◽  
O. Nouri ◽  
A. Rahmatinejad ◽  
S. Mohammadi
Keyword(s):  
Excitation Energy ◽  
Energy Dependence ◽  
Pair Breaking ◽  
Microscopic Approach ◽  
Nuclear Level ◽  
Pairing Effect ◽  
Level Densities ◽  
Energy Dependent

Excitation-energy dependent parity ratios in the level densities of [Formula: see text] isotopes are calculated within a microscopic approach. Introducing a parity equilibration parameter, energy dependence of the transition from where a single parity dominates to a parity equilibrated state is compared among [Formula: see text] isotopes and its relation to the pairing effect is investigated. A correlation between the pair-breaking and the equilibration of parity distributions is observed for the considered isotopes.

scholarly journals Determination of nuclear level densities from experimental information

1994 ◽  
Vol 50 (4) ◽  
pp. 1913-1916 ◽  
Author(s):  
B. J. Cole ◽  
N. J. Davidson ◽  
H. G. Miller
Keyword(s):  
Experimental Information ◽  
Nuclear Level ◽  
Level Densities

Persistence of Odd-Even Effect on Nuclear Level Densities at High Excitation Energy

1970 ◽  
Vol 1 (2) ◽  
pp. 594-601 ◽  
Author(s):  
A. A. Katsanos ◽  
R. W. Shaw ◽  
R. Vandenbosch ◽  
D. Chamberlin
Keyword(s):  
Excitation Energy ◽  
High Excitation Energy ◽  
High Excitation ◽  
Nuclear Level ◽  
Level Densities

The effect of shell closure on the thermodynamic properties of 207Pb and 89Y

2016 ◽  
Vol 25 (11) ◽  
pp. 1650098 ◽  
Author(s):  
V. Dehghani ◽  
Gh. Forozani ◽  
Kh. Benam
Keyword(s):  
Experimental Data ◽  
Thermodynamic Properties ◽  
Excitation Energy ◽  
Low Temperatures ◽  
Shell Closure ◽  
Nuclear Level ◽  
Bcs Model ◽  
Level Densities ◽  
Entropy Contribution

Nuclear level densities of [Formula: see text]Pb and [Formula: see text]Y are calculated using the Lipkin–Nogami (LN) method and Bradeen–Cooper–Schrieffer (BCS) model. It is revealed that the calculated nuclear level densities are highly matched with the experimental data of Oslo group. The excitation energy and entropy are calculated for mentioned nuclei. In the case of two studied nuclei the characteristic of being magic for the number of neutrons or protons causes the decrease of the excitation energy and entropy contribution of magic system at low temperatures.

Nuclear level densities below 40 MeV excitation energy in the mass regionA ≃ 50

1990 ◽  
Vol 335 (3) ◽  
pp. 299-313 ◽  
Author(s):  
M. Avrigeanu ◽  
M. IvaŞcu ◽  
V. Avrigeanu
Keyword(s):  
Excitation Energy ◽  
Nuclear Level ◽  
Level Densities

Determination of the nuclear level density at high excitation energy

1991 ◽  
Vol 43 (2) ◽  
pp. 666-677 ◽  
Author(s):  
A. Chbihi ◽  
L. G. Sobotka ◽  
N. G. Nicolis ◽  
D. G. Sarantites ◽  
D. W. Stracener ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Level Density ◽  
High Excitation Energy ◽  
Nuclear Level Density ◽  
High Excitation ◽  
Nuclear Level
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