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

Abstract
HTML
Reference
Related

PDF

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)

[1]	XING Yong-Zhong , LIU Jian-Ye , ZUO Wei , LI Xi-Guo . Special Role of Neutron-Halo Nucleus on the Momentum Dissipation in Heavy Ion Collisions. Chinese Physics C, 2005, 29(10): 978-982.
[2]	LIU Jian-Ye , GUO Wen-Jun , REN Zhong-Zhou , XING Yong-Zhong , ZUO Wei , LI Xi-Guo . Special Role of Neutron-Halo Structure in the Fragmentation Reactions. Chinese Physics C, 2005, 29(8): 761-765.
[3]	LU Hong-Feng , MENG Jie , ZHANG Shuang-Quan . Giant Neutron Halos in Λ-Hypernuclei ΛA a and ΛΛ ACa in the Relativistic Continuum Hartree-Bogoliubov Theory. Chinese Physics C, 2003, 27(5): 411-415.
[4]	ZUO Wei . Effects of Three-body Forces and Relativistic Effect on Equation of State of Nuclear Matter. Chinese Physics C, 2002, 26(11): 1134-1141.
[5]	LIU Jian-Feng , ZHAO Wei-Juan , SU Zong-Di . Study on γ-Ray Strength Function of Neutron Radiative Capture for Middle and Heavy Nuclei. Chinese Physics C, 2002, 26(12): 1254-1263.
[6]	OUYANG Hua-Fu . Effects of the Space Charge Forces and the Beam Halo in an AVF Cyclotron with Intense Beam Currents. Chinese Physics C, 2001, 25(6): 561-570.
[7]	GUO Wen-Jun , JIANG Huan-Qing , LIU Jian-Ye . Total Reaction Cross Section of Nucleus-Nucleus Collision and Density Distributions of Halo Nuclei. Chinese Physics C, 2001, 25(12): 1206-1212.
[8]	OUYANG Hua-Fu . Effects of the Space Charge Forces and the Beam Halo in a Cyclotron. Chinese Physics C, 2001, 25(7): 674-679.
[9]	Bai Xinhua , Hu Jimin . Pairing Interction between Neutrons and Netron Halo in Light Nuclei. Chinese Physics C, 1997, 21(10): 932-936.
[10]	Ren Jingru , Lu Suiling , Wang Chengrui , He Mao , Zhang Naijian , Cao Peiyuan , Li Jinyu . Halo Events in Superhigh Energy Nuclear Interactions. Chinese Physics C, 1996, 20(5): 400-404.
[11]	ZHOU Jin-Li , LI Qing-Run . Total Cross Sections and Forward Scattering Amplitudes for Intermediate Energy Proton on Light Nuclei. Chinese Physics C, 1992, 16(9): 822-825.
[12]	WANG Bao-Lin , RONG Zhong-Lin , WU Hua-Chuan . The Rotational Effects in E4 Transitions of Deformed Nuclei. Chinese Physics C, 1992, 16(2): 165-171.
[13]	MU Yun-Shan , XU Hai-Shan , XIANG Zheng-Yu , LI Ye-Xiang , WANG Shi-Ming , LIU Jian-Feng . Fast Neutron Capture Cross Section of Natural Molybdenum. Chinese Physics C, 1991, 15(1): 66-70.
[14]	YUAN Zhu-Shu , HUO Yu-Kun , LIU Jian-Feng , LU Zu-Hui . An Unified Formalism to Study Nonstatistical Effects in Radiative Vapture Reactions. Chinese Physics C, 1991, 15(12): 1086-1093.
[15]	LIU Jian-Feng , Huo Yu-Kun , YUAN Zhu-Shu . Mass Shell and Even-odd Effects in Radiative Capture Reaction. Chinese Physics C, 1991, 15(4): 349-357.
[16]	JIANG Huan-Qing . μ^－ CAPTURE IN NUCLEI. Chinese Physics C, 1990, 14(6): 532-536.
[17]	XIANG Zheng-Yu , XU Hai-Shan , LI Ye-Xiang , MU Yun-Shan , WANG Shi-Ming , LIU Jian-Feng . FAST NEUTRON CAPTURE CROSS SECTIONS OF FISSION PRODUCT NUCLIDE Eu. Chinese Physics C, 1989, 13(10): 938-941.
[18]	SONG Xiao-Tong , CHEN Zheng . THE FORMATION CROSS SECTION FOR (dμ) ATOM IN RADIATIVE CAPTURE PROCESS. Chinese Physics C, 1986, 10(6): 647-655.
[19]	LIU Jian-Feng , HUO Yu-Kun . RADIATIVE CAPTURE IN THE INELASTIC CHANNEL OF THE COMPOUND NUCLEUS. Chinese Physics C, 1983, 7(3): 355-360.
[20]	Wang Ying-cai , Li Guang-lie , Zhang Zong-ye . THE π CONDENSATION EFFECTS IN FINITE NUCLEI. Chinese Physics C, 1980, 4(1): 63-72.

Access

Get Citation

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

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

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

Article Metric

Article Views(3856)
PDF Downloads(572)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
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.