Stuty on the Process of the Fast Neutron Radiative Capture for <SUP>40</SUP>Ca and <SUP>208</SUP>Pb

LIU Jian-Feng; ZHAO Wei-Juan

Chinese Physics C> 2002, Vol. 26> Issue(11) : 1158-1165

Stuty on the Process of the Fast Neutron Radiative Capture for ⁴⁰Ca and ²⁰⁸Pb

LIU Jian-Feng ^, ,
ZHAO Wei-Juan

Department of Physics, Zhengzhou University, Zhengzhou 450052, China

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Abstract：
The pre-equilibrium correction for the nuclear reactions induced by fast neutron is considered as follows: the nuclear reaction processes with the exciton number equal to or larger than five can still be described by the statistical theory of the nuclear reaction. The particle emission processes, in which less than five excitons are involved, are calculated by means of the exciton model and the γ emission of one exciton state is calculated by the direct capture mechanism. For the three-exciton state, only the semidirect capture mechanism, which plays the main role in the researched energy region, is taken into account. The interference effect between the direct and semidirect capture is also considered. The radiative capture cross sections for ⁴⁰Ca and ²⁰⁸Pb in the neutron incident energy region from 3 MeV to 20 MeV are calculated and a better coincidence with the experimental values is obtained. At the same time, the contribution to the (n, γ) reaction cross sections of the γ emissions before and after statistical equilibriums as well as the characteristics of the direct capture, semidirect capture and their interferece terms are discussed.

References

[1]

. Allen B J et al.Advancesin Nucl.Phys.,1978,10:129 2. Raman S et al.Phys.Rev.,1985,C32:183. HUOYu Kun et al.Nucl.Phys.,1983,A406:1 4. Lane A M ,Lynn J E .Nucl.Phys.,1959,5:732 5. Brown G E .Nucl.Phys.,1964,57:339 6. Clement C F .Nucl.Phys.,1965,66:273 7. MA Zhong-Yu et al.Chinese Journal of Nucl.Phys.,1981,3:217(in Chinese) (马中玉等.原子核物理,1981,3:217)8. Oblozinsky P .Phys.Rev.,1987,C2:4079. Oblozinsky P .Phys.Rev.,1990,C4:165210. SHI Xiang-Jun et al.Nucl.Phys.,1987,A466:333 11. LIU JianFeng et al.High Energy Phys.and Nucl.Phys.,1990,5:469(in Chinese) (刘建峰等.高能物理与核物理,1990,5:469) 12. LIUJianFengetal.HighEnergyPhys.andNucl.Phys.,1991,4:349(inChinese) (刘建峰等.高能物理与核物理,1991,4:349)13. Becchetti F D et al.Phys.Rev.,1969,182:119014. Gilbert A ,cameron A G W .Can.j.Phys.,1965,43:1446 15. Dietrich S S et al.Atomic Dataand Nuclear Data Tables,1988,38:199 16. Potokar Metal.Nucl.Phys.,1977,A277:29 17. EXFOR (EXchange FOR mat).Computerized System for the Storage,Retrievaland International Exchange of Experimental Nuclear Reaction Data,Coordinated by the IAEA Nuclear Data Section

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[12]	Dou Zhiguo , Jing Xiaogong , Zhao Guoquan . Single-Particle and Single Hole Energies in the ⁴⁰Ca Region. Chinese Physics C, 1991, 15(S1): 85-92.
[13]	JING Xiao-Gong , LI Cheng-Zu , YANG Shan-De , WU Shi-Shu . SINGLE-PARTICLE AND SINGLE-HOLE SPECTRA IN ⁴⁰Ca. Chinese Physics C, 1986, 10(6): 744-751.
[14]	LI Zhu-Xia , ZHANG Xi-Zhen . A STUDY OF THE ISOSCALAR GIANT RESONANCE IN ⁴⁰Ca. Chinese Physics C, 1986, 10(3): 330-334.
[15]	SHEN Wen-Qing , QIAO Wei-Min , ZHU Yong-Tai , ZHAN Wen-Long . DIFFUSION MODEL ANALYSES OF THE EXPERIMENTAL DATA OF ¹²C+²⁷Al,⁴⁰Ca DISSIPATIVE COLLISIONS. Chinese Physics C, 1984, 8(6): 732-739.
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[17]	SHEN Qing-Biao , TIAN Ye , LIU Rui-Zhe . CALCULATIONS OF NUCLEON DENSITIES, KINETIC ENERGY DENSITIES, SPIN DENSITIES AND CHARGE DENSITY WITH SHELL MODEL FOR ⁴⁰Ca. Chinese Physics C, 1983, 7(4): 473-480.
[18]	LI ZHU-XIA , ZHANG XI-ZHEN . THE l-FORBIDDEN M₁ TRANSITIONS AND EFFECTIVE g-FACTORS IN ⁴⁰Ca±1 NUCLEI. Chinese Physics C, 1982, 6(3): 381-384.
[19]	Zhao Shu-ping . CALCULATION OF THE ELASTIC-SCATTERING CROSS-SECTION OF ENERGETIC ELECTRON BY ⁴⁰Ca NUCLEUS IN CONSIDERATION OF THE INFLUENCE OF“PION CONDENSATION”. Chinese Physics C, 1980, 4(5): 569-575.
[20]	FU TE-CHI , FANG PAO . THE FINE STRUCTURE OF ²⁰⁸Pb 1⁺ STATES. Chinese Physics C, 1978, 2(3): 263-266.

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LIU Jian-Feng and ZHAO Wei-Juan. Stuty on the Process of the Fast Neutron Radiative Capture for ⁴⁰Ca and ²⁰⁸Pb[J]. Chinese Physics C, 2002, 26(11): 1158-1165.

LIU Jian-Feng and ZHAO Wei-Juan. Stuty on the Process of the Fast Neutron Radiative Capture for ⁴⁰Ca and ²⁰⁸Pb[J]. Chinese Physics C, 2002, 26(11): 1158-1165. shu

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Received: 2001-12-17
Revised: 1900-01-01

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通讯作者: 陈斌, [email protected]

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沈阳化工大学材料科学与工程学院沈阳 110142

Stuty on the Process of the Fast Neutron Radiative Capture for ⁴⁰Ca and ²⁰⁸Pb

Corresponding author: LIU Jian-Feng,

Department of Physics, Zhengzhou University, Zhengzhou 450052, China

Received Date: 2001-12-17

Accepted Date: 1900-01-01

Available Online: 2002-11-05

Abstract: The pre-equilibrium correction for the nuclear reactions induced by fast neutron is considered as follows: the nuclear reaction processes with the exciton number equal to or larger than five can still be described by the statistical theory of the nuclear reaction. The particle emission processes, in which less than five excitons are involved, are calculated by means of the exciton model and the γ emission of one exciton state is calculated by the direct capture mechanism. For the three-exciton state, only the semidirect capture mechanism, which plays the main role in the researched energy region, is taken into account. The interference effect between the direct and semidirect capture is also considered. The radiative capture cross sections for ⁴⁰Ca and ²⁰⁸Pb in the neutron incident energy region from 3 MeV to 20 MeV are calculated and a better coincidence with the experimental values is obtained. At the same time, the contribution to the (n, γ) reaction cross sections of the γ emissions before and after statistical equilibriums as well as the characteristics of the direct capture, semidirect capture and their interferece terms are discussed.

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Stuty on the Process of the Fast Neutron Radiative Capture for ⁴⁰Ca and ²⁰⁸Pb

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Stuty on the Process of the Fast Neutron Radiative Capture for ⁴⁰Ca and ²⁰⁸Pb

Stuty on the Process of the Fast Neutron Radiative Capture for ⁴⁰Ca and ²⁰⁸Pb