Chinese Physics C > 2009, Vol. 33 > Issue(S1): 79-81 DOI: 10.1088/1674-1137/33/S1/026

Calculation of astrophysical reaction rate of⁸²Ge(n,γ)⁸³Ge

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The neutron capture reaction on a neutron-rich near closed-shell nucleus⁸²Ge may play an important role in the r-process following the fallout from nuclear statistical equilibrium in core-collapse supernovae. By carrying out a DWBA analysis for the experimental angular distribution of⁸²Ge(d, p)⁸³Ge reaction we obtain the single particle spectroscopic factors, S_2,5/2and S_0,1/2for the ground and first excited states of⁸³Ge=⁸²Ge⊙n, respectively. And then these spectroscopic factors are used to calculate the direct capture cross sections for the⁸²Ge(n, γ)⁸³Ge reaction at energies of astrophysical interest. The optical potential for neutron scattering on unstable nucleus⁸²Ge is not known experimentally. We employed a real folding potential which was calculated by using the proper⁸²Ge density distribution and an effective nucleon-nucleon force DDM3Y. The neutron capture reactions on neutron-rich closed-shell nuclei are expected to be dominated by the direct capture to bound states. We will show that the direct capture rates on these nuclei are sensitive to the structure of the low-lying states.

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[1]

. Thomas J S et al. Phys. Rev. C, 2005, 71: 0213022. Kobos A M et al. Nucl. Phys. A, 1984, 425: 2083. Perey C M et al. Phys. Rev., 1963, 132: 7554. Becchetti F D et al. Phys. Rev., 1969, 182: 11905. Krausmann E et al. Phys. Rev. C, 1996, 53: 4696. HU Ji-Min et al. The Nuclear Theory (Volume II). Beijing:Atomic Energy Press, 1987. 113 (in Chinese)7. Radcap. for. Edited by Bertulani C A, 20038. Blomgvisl J et al. Ark. Fys., 1960, 16: 543

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WANG Mian, CHEN Yong-Shou, LI Zhi-Hong, LIU Wei-Ping and SHU Neng-Chuan. Calculation of astrophysical reaction rate of ⁸²Ge(n,γ) ⁸³Ge[J]. Chinese Physics C, 2009, 33(S1): 79-81. doi: 10.1088/1674-1137/33/S1/026

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Received: 2008-10-22
Revised: 1900-01-01

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Calculation of astrophysical reaction rate of⁸²Ge(n,γ)⁸³Ge

Corresponding author:WANG Mian,

Received Date:2008-10-22
Accepted Date:1900-01-01
Available Online:2009-01-10

Abstract:The neutron capture reaction on a neutron-rich near closed-shell nucleus⁸²Ge may play an important role in the r-process following the fallout from nuclear statistical equilibrium in core-collapse supernovae. By carrying out a DWBA analysis for the experimental angular distribution of⁸²Ge(d, p)⁸³Ge reaction we obtain the single particle spectroscopic factors, S_2,5/2and S_0,1/2for the ground and first excited states of⁸³Ge=⁸²Ge⊙n, respectively. And then these spectroscopic factors are used to calculate the direct capture cross sections for the⁸²Ge(n, γ)⁸³Ge reaction at energies of astrophysical interest. The optical potential for neutron scattering on unstable nucleus⁸²Ge is not known experimentally. We employed a real folding potential which was calculated by using the proper⁸²Ge density distribution and an effective nucleon-nucleon force DDM3Y. The neutron capture reactions on neutron-rich closed-shell nuclei are expected to be dominated by the direct capture to bound states. We will show that the direct capture rates on these nuclei are sensitive to the structure of the low-lying states.