Nuclear Halo Effect on Direct Nucleon Capture Cross Sections

LIU Zu-Hua; ZHOU Hong-Yu

Chinese Physics C> 2005, Vol. 29> Issue(10) : 974-977

Nuclear Halo Effect on Direct Nucleon Capture Cross Sections

LIU Zu-Hua ^, ,
ZHOU Hong-Yu

China Institute of Atomic Energy,Beijing 102413,China2 Key Laboratory of Beam Technology and Material Modification of Ministry of Education,Beijing Normal University,Beijing 100875,China

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Abstract：
The capture cross sections at stellar energies are very difficult to be measured directly. Hence,data are usually evaluated by means of indirect methods and extrapolations from the experimental data obtained at the possible lowest energies. In this work we have shown that the results obtained with the asymptotic normalization coefficient (ANC) method are nearly model independent. Therefore, the ANC approach of the transfer reactions provides a reliable way for the determination of the capture cross sections at stellar energies. By virtue of its reliability, we have calculated the capture cross sections of the ¹⁰Be (n,γ)¹¹Be reaction by means of nuclear ANC method.¹¹Be is a well-known neutron halo nucleus with two weak bound states. As a typical example, we have shown that the radiative cross sections for a nucleon captured into a halo state are obviously enhanced. The enormous enhancement of the capture cross section is just due to the large overlap of the incident neutron wave with the extended tail of the halo.

References

[1]

. XU H M, Gagliardi C A, Tribble R E et al. Phys. Rev. Lett., 1994, 73: 20272. Mukhamedzhanov A M, Gagliardi C A, Tribble R E. Phys.Rev., 2001, C63: 0246123. Zwieglinski B, Benenson W, Robertson R G H et al. Nucl. Phys., 1979, A315: 1244. LIU Z H, ZHANG X Z, ZHANG H Q. Phys. Rev., 2003,C68: 0243055. LIU Z H, ZHOU H Y. Chin. Phys. Lett., 2004, 21: 406. Angulo C, Arnould M, Rayet M et al. Nucl. Phys., 1999,A656: 37. WU K S. Investigation of Radiactive Capture Reaction,s-Process Network Equation and Neutron Source of Astrophysical Interest. In: Doctoral Dissertation. China Institute of Atomic Energy, Beijing, 2003(in Chinese)(吴开谡.天体物理感兴趣的辐射俘获反应,过程网络方程和中子源研究.博士学位论文.中国原子能科学研究院,北京,2003)

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LIU Zu-Hua and ZHOU Hong-Yu. Nuclear Halo Effect on Direct Nucleon Capture Cross Sections[J]. Chinese Physics C, 2005, 29(10): 974-977.

LIU Zu-Hua and ZHOU Hong-Yu. Nuclear Halo Effect on Direct Nucleon Capture Cross Sections[J]. Chinese Physics C, 2005, 29(10): 974-977. shu

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Received: 2005-01-10
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Nuclear Halo Effect on Direct Nucleon Capture Cross Sections

LIU Zu-Hua ^,
ZHOU Hong-Yu

Corresponding author: LIU Zu-Hua,

China Institute of Atomic Energy,Beijing 102413,China2 Key Laboratory of Beam Technology and Material Modification of Ministry of Education,Beijing Normal University,Beijing 100875,China

Received Date: 2005-01-10
Accepted Date: 1900-01-01
Available Online: 2005-10-05

Abstract: The capture cross sections at stellar energies are very difficult to be measured directly. Hence,data are usually evaluated by means of indirect methods and extrapolations from the experimental data obtained at the possible lowest energies. In this work we have shown that the results obtained with the asymptotic normalization coefficient (ANC) method are nearly model independent. Therefore, the ANC approach of the transfer reactions provides a reliable way for the determination of the capture cross sections at stellar energies. By virtue of its reliability, we have calculated the capture cross sections of the ¹⁰Be (n,γ)¹¹Be reaction by means of nuclear ANC method.¹¹Be is a well-known neutron halo nucleus with two weak bound states. As a typical example, we have shown that the radiative cross sections for a nucleon captured into a halo state are obviously enhanced. The enormous enhancement of the capture cross section is just due to the large overlap of the incident neutron wave with the extended tail of the halo.