نوع مقاله : مقاله پژوهشی
نویسندگان
1 Department of Physics, Imam Hussein University, P.O. Box: 16575-347, Tehran - Iran
2 Physics Group, Science Department, Zanjan University, P.O. Box: 45195-313, Zanjan - Iran
3 3- Fars Science and Research Center, Islamic Azad University, P.O. Box: 71454, Shiraz - Iran
چکیده
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.
کلیدواژهها
عنوان مقاله [English]
Discrete Levels Density and Spin Cut off Parameters of the 36Cl, 40K, 60Co and 61Ni Nucleuses
نویسندگان [English]
- R. . Razavinejad 1
- T. . Kakavand 2
- A.N. . Behkami 3
چکیده [English]
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.
کلیدواژهها [English]
- Nuclear Level Density
- Excited Levels
- Spin Cut off Parameter
- Potassium 40
- Chlorine 36
- Cobalt 60
- Nichel 61
- 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).
)