Discrete Levels Density and Spin Cut off Parameters of the 36Cl, 40K, 60Co and 61Ni Nucleuses

. Razavinejad, R.; . Kakavand, T.; . Behkami, A.N.

Discrete Levels Density and Spin Cut off Parameters of the 36Cl, 40K, 60Co and 61Ni Nucleuses

Document Type : Research Paper

Authors

R. . Razavinejad

T. . Kakavand

A.N. . Behkami

Abstract

On the bases of Bethe and the constant temperature models, the level density parameters have been calculated for the ³⁶Cl, ⁴⁰K, ⁶⁰Co and ⁶¹Ni nuclei, nucleuses through fitting the complete level schemes in low excitation energy levels. Both calculations reproduce experimental level densities equally well. The spins cut off parameters of the same nuclei have been determined from the analysis of experimental data for spins of low-lying states.

Highlights

1. H.A. Bethe, “An attempt to calculate the number of energy levels of a heavy nucleus,” Phys. Rev. 50, 332-341 (1936).

2. A. Gilbert, A.G.W. Cameron, “A composite nuclear level density formula with shell corrections,” Can. J. Phys. Vol. 43, 1446-1496 (1965).

3. J.R. Huizenga, L.G. Moretto, “Nuclear level densities,” Annu. Rev. Nucl. Sci. 22, 427-464 (1972).

4. T. Ericson, “A statistical analysis of excited nuclear states,” Nucl. Phys. Vol. 11, 481-491 (1959).

5. T. Von Egidy, A.N. Behkami, H.H. Schmidt, “Nuclear level densities and level spacing distributions from ²⁰F to ²⁴⁴Am,” Nucl. Phys. A 454, 109-127 (1986).

6. H.A. Bethe, “Nuclear Physics B. Nuclear Dynamics, Theoretical,” Rev. Mod. Phys. 9, 69-244 (1937).

7. T. Von Egidy, H.H. Schmidt, A.N. Behkami, “Nuclear level densities and level spacing distributions: Part II,” Nucl. Phys. A 481, 189-206 (1988).

8. T. Kakavand, R. Razavi, A.N. Behkami, “Level studies of ⁷³As via (p, ngamma) reaction and density of discrete levels in ⁷³As,” Proc. DAE Symp. (Nucl. Phys.) 52, 272-273 (2007).

9. W. Dilg, W. Schantl, H. Vonach, M. Uhl, “Level density parameters for the back-shifted fermi gas model in the mass range 40<A<250,” Nucl. Phys. A 217, 269-298 (1973).

10. Privete communication, Wang Shu Neun, China’s Atomic Energy (2008).

Keywords

Nuclear Level Density

Excited Levels

Spin Cut off Parameter

Potassium 40

Chlorine 36

Cobalt 60

Nichel 61

1. 1. H.A. Bethe, “An attempt to calculate the number of energy levels of a heavy nucleus,” Phys. Rev. 50, 332-341 (1936).
1. 2. A. Gilbert, A.G.W. Cameron, “A composite nuclear level density formula with shell corrections,” Can. J. Phys. Vol. 43, 1446-1496 (1965).
1. 3. J.R. Huizenga, L.G. Moretto, “Nuclear level densities,” Annu. Rev. Nucl. Sci. 22, 427-464 (1972).
1. 4. T. Ericson, “A statistical analysis of excited nuclear states,” Nucl. Phys. Vol. 11, 481-491 (1959).
1. 5. T. Von Egidy, A.N. Behkami, H.H. Schmidt, “Nuclear level densities and level spacing distributions from ²⁰F to ²⁴⁴Am,” Nucl. Phys. A 454, 109-127 (1986).
1. 6. H.A. Bethe, “Nuclear Physics B. Nuclear Dynamics, Theoretical,” Rev. Mod. Phys. 9, 69-244 (1937).
1. 7. T. Von Egidy, H.H. Schmidt, A.N. Behkami, “Nuclear level densities and level spacing distributions: Part II,” Nucl. Phys. A 481, 189-206 (1988).
1. 8. T. Kakavand, R. Razavi, A.N. Behkami, “Level studies of ⁷³As via (p, ngamma) reaction and density of discrete levels in ⁷³As,” Proc. DAE Symp. (Nucl. Phys.) 52, 272-273 (2007).
1. 9. W. Dilg, W. Schantl, H. Vonach, M. Uhl, “Level density parameters for the back-shifted fermi gas model in the mass range 40<A<250,” Nucl. Phys. A 217, 269-298 (1973).
1. 10. Privete communication, Wang Shu Neun, China’s Atomic Energy (2008).