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Phys. Rev. C 71, 052801(R) (2005) [4 pages]

The 8Li(d,p)9Li reaction and the astrophysical 8Li(n,γ)9Li reaction rate

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Z. H. Li, W. P. Liu, X. X. Bai, B. Guo, G. Lian, S. Q. Yan, B. X. Wang, S. Zeng, Y. Lu, J. Su, Y. S. Chen, K. S. Wu, and N. C. Shu
China Institute of Atomic Energy, P. O. Box 275(46), Beijing 102 413, P. R. China

T. Kajino
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan;
Department of Astronomy, University of Tokyo, Bunkyo-ku, Tokyo 113-0033 Japan

Received 12 July 2004; revised 28 October 2004; published 19 May 2005

The 8Li(n,γ)9Li reaction plays an important role in both the r-process nucleosynthesis and the inhomogeneous big bang models. Its direct capture rates can be extracted from the 8Li(d,p)9Li reaction, indirectly. We have measured the angular distribution of the 8Li(d,p)9Lig.s. reaction at Ec.m. = 7.8 in inverse kinematics using coincidence detection of 9Li and the recoil proton, for the first time. Based on distorted wave Born approximation (DWBA) analysis, the 8Li(d,p)9Lig.s. cross section was determined to be 7.9 ± 2.0 mb. The single particle spectroscopic factor S1,3/2 for the ground state of 9Li=8Li⊗n was derived to be 0.68±0.14, and then used to calculate the direct capture cross sections for the 8Li(n,γ)9Lig.s. reaction at energies of astrophysical interest. The astrophysical 8Li(n,γ)9Lig.s. reaction rate for the direct capture was found to be 3970±950 cm3 mole-1 s-1 at T9=1. This presents the first experimental constraint for the 8Li(n,γ)9Li reaction rates of astrophysical relevance.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.71.052801
DOI:
10.1103/PhysRevC.71.052801
PACS:
25.60.Je, 21.10.Jx, 25.40.Lw, 26.35.+c
 
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