Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (10): 100510-100510.doi: 10.11889/j.0253-3219.2014.hjs.37.100510

• NUCLEAR PHYSICS, INTERDISCIPLINARY RESEARCH • Previous Articles     Next Articles

Proton radiative capture reaction on 11B

LI Ertao1 LI Zhihong2 LI Yunju2 GUO Bing2 WU Zhidan2 SU Jun2 YAN Shengquan2 WANG Youbao2 WANG Baoxiang2 BAI Xixiang2 GAN Lin1 JIN Sunjun2 LIU Xin2 ZENG Sheng2 LIAN Gang2 SUN Huibin1 LIU Weiping2   

  1. 1(College of Physics Science and Technology, Shenzhen University, Shenzhen 518060, China) 2(China Institute of Atomic Energy, Beijing 102413, China)
  • Received:2014-04-29 Revised:2014-05-23 Online:2014-10-10 Published:2014-10-16

Abstract: Background: In big bang nucleosynthesis (BBN) network, 11B(p,γ)12C reaction is believed to be one of the most important reactions for the production of 12C nucleus, and precise measurement of this reaction rates is helpful to understand the abundance of 12C. At energies of astrophysical interest, direct measurement of 11B(p,γ)12C reaction is very difficult because of the coulomb barrier, but it can be derived by the proton spectroscopic factor of 12C. Elastic transfer reaction is a good tool to extract single nucleon spectroscopic factor because the reaction has same entrance and exit channels and involves only one spectroscopic factor. So the angular distribution of the 12C(11B,12C)11B elastic transfer reaction was chosen to extract the proton spectroscopic factor of 12C. Purpose: This paper’s purpose is to calculate the proton spectroscopic factor of 12C and deduce the astrophysical S(E)-factors and reaction rates of 11B(p,γ)12C direct radiative capture reaction. Methods: The angular distribution of 12C(11B,12C)11B elastic transfer reaction was measured by using the Q3D magnetic spectrograph of HI-13 tandem accelerator and two-dimensional position sensitive silicon detector (2D-PSSD). The proton spectroscopic factor of 12C was then derived by using the distorted wave Born approximation (DWBA) analysis. Results: The proton spectroscopic factor of 12C was determined and then the astrophysical S(E)-factors and reaction rates of 11B(p,γ)12C direct radiative capture reaction were deduced successfully. Conclusion: 12C(11B,12C)11B elastic transfer reaction is a good tool to extract the proton spectroscopic factor of 12C, and then the astrophysical S-factors and reaction rates of 11B(p,γ)12C direct radiative capture reaction could be deduced by using the proton spectroscopic factor of 12C. The BBN network calculation which includes 11B(p,γ)12C is underway.

Key words: Q3D magnetic spectrograph, Angular distribution of elastic transfer reaction, Direct radiative capture reaction, Proton spectroscopic factor, Astrophysical reaction rates