scholarly journals Determination of the Zn60 level density from neutron evaporation spectra

2021 ◽  
Vol 103 (1) ◽  
Author(s):  
D. Soltesz ◽  
M. A. A. Mamun ◽  
A. V. Voinov ◽  
Z. Meisel ◽  
B. A. Brown ◽  
...  
Keyword(s):  
Level Density ◽  
Neutron Evaporation

Determination of the29Si level density from 3 to 22 MeV

1997 ◽  
Vol 55 (1) ◽  
pp. 133-143 ◽  
Author(s):  
F. B. Bateman ◽  
S. M. Grimes ◽  
N. Boukharouba ◽  
V. Mishra ◽  
C. E. Brient ◽  
...  
Keyword(s):  
Level Density

The (n,γ) reaction productions of 35S, 42Ar, 45Ca, 63Ni, 85Kr, 89Sr, 113mCd, 121m,123Sn, 147Pm, 151Sm, 152,154,155Eu, 170,171Tm, 185,188W, 194Os, 204Tl, 210Po, 227Ac, 242,244Cm radioisotopes for using in nuclear battery via phenomenological and microscopic level density models

2019 ◽  
Vol 28 (08) ◽  
pp. 1950057 ◽  
Author(s):  
Ozan Artun
Keyword(s):  
Cross Section ◽  
Level Density ◽  
Nuclear Data ◽  
Microscopic Level ◽  
Level Density Models ◽  
Battery Technology ◽  
Reaction Processes ◽  
Nuclear Battery ◽  
Induced Reaction

Aims of this work are: (i) Investigation of the production of some radioisotopes that could be used in nuclear battery technology with neutron-induced reaction processes, (ii) Estimation of the cross-section curves of [Formula: see text] reactions for astrophysical processes in the energy region between 1[Formula: see text]eV and 1[Formula: see text]MeV, (iii) Determination of suitable level density models for the [Formula: see text] reaction processes. Additionally, the obtained results were compared with the experimental data and recommended data. Based on the calculated results, to eliminate lack of nuclear data in the literature, we recommend new experiments for some reaction processes to be performed by the experimenters. Moreover, for the [Formula: see text] reaction processes, suitable level density models were proposed.

Erratum: Determination of the level density ofSi29from Ericson fluctuations

1993 ◽  
Vol 47 (5) ◽  
pp. 2426-2426 ◽  
Author(s):  
V. Mishra ◽  
N. Boukharouba ◽  
S. M. Grimes ◽  
K. Doctor ◽  
R. S. Pedroni ◽  
...  
Keyword(s):  
Level Density

scholarly journals Energy sharing based on microscopic level densities

2021 ◽  
Vol 256 ◽  
pp. 00013
Author(s):  
Jørgen Randrup ◽  
Martin Albertsson ◽  
Gillis Carlsson ◽  
Thomas Døssing ◽  
Peter Möller ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Level Density ◽  
Coulomb Repulsion ◽  
Microscopic Level ◽  
Level Densities ◽  
Initial Excitation ◽  
Specific Fragment ◽  
Quadratic Surfaces ◽  
Neutron Evaporation ◽  
Energy Sharing

The transformation of a moderately excited heavy nucleus into two excited fission fragments is modeled as a strongly damped evolution of the nuclear shape. The resulting Brownian motion in the multi-dimensional deformation space is guided by the shape-dependent level density which has been calculated microscopically for each of nearly ten million shapes (given in the three-quadratic-surfaces parametrization) by using a previously developed combinatorial method that employs the same single-particle levels as those used for the calculation of the pairing and shell contributions to the five-dimensional macroscopic-microscopic potential-energy surface. The stochastic shape evolution is followed until a small critical neck radius is reached, at which point the mass, charge, and shape of the two proto-fragments are extracted. The available excitation energy is divided statistically on the basis of the microscopic level densities associated with the two distorted fragments. Specific fragment structure features may cause the distribution of the energy disvision to deviate significantly from expectations based on a Fermi-gas level density. After their formation at scission, the initially distorted fragments are being accelerated by their mutual Coulomb repulsion as their shapes relax to their equilibrium forms. The associated distortion energy is converted to additional excitation energy in the fully accelerated fragments. These subsequently undergo sequential neutron evaporation which is calculated using again the appropriate microscopic level densities. The resulting dependence of the mean neutron multiplicity on the fragment mass, as well as the dependence of on the initial excitation energy of the fissioning compound nucleus, exhibit features that are similar to the experimentally observed behavior, suggesting that the microscopic energy sharing mechanism plays an important role in low-energy fission.

Systematics and Determination of Level Density Parameters of Fission Product Nuclei

1984 ◽  
Vol 21 (1) ◽  
pp. 10-20 ◽  
Author(s):  
Shungo IIJIMA ◽  
Tadashi YOSHIDA ◽  
Tamotsu AOKI ◽  
Takashi WATANABE ◽  
Makoto SASAKI
Keyword(s):  
Fission Product ◽  
Level Density

Comparison of Spherical Cell, OPW, and APW Methods for Hyperfine Contact Densities

1975 ◽  
Vol 53 (6) ◽  
pp. 648-649 ◽  
Author(s):  
J. P. Perdew ◽  
S. B. Nickerson ◽  
S. H. Vosko ◽  
R. A. Moore
Keyword(s):  
Fermi Level ◽  
Density Of States ◽  
Knight Shift ◽  
Level Density ◽  
Spherical Cell ◽  
Atomic Volume ◽  
Lithium Metal ◽  
Contact Density ◽  
Absolute Value

The spherical cell, OPW, and APW methods for the determination of the direct hyperfine contact density PFd are compared by means of explicit calculations for lithium metal. Serious deficiencies of the first two methods are discussed. In particular the OPW method is found to converge very slowly for the absolute value of PFd, although it predicts relative changes in PFd due to changes in atomic volume reasonably well. The Fermi level density of states, another quantity which affects the Knight shift, is also considered.

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