NIC-XIV School 2016

MEASUREMENT OF THE 7Be(d, p) REACTION FOR THE STUDTY OF THE PRIMORDIAL 7LI PRODUCTION IN THE BIG-BANG NUCLEOSYNTHESIS

15 Jun 2016, 16:30

1h 30m

Library Hall, Central Library (Niigata University (Ikarashi Campus))

Board: 12

Poster Presentation Posters

Speaker

Ms Azusa Inoue (RCNP)

Description

A. Inoue1, A. Tamii1, K. Abe3, S. Adachi1, N. Aoi1, M. Fukuda2, G. Gey1, T. Hashimoto4, S. Hayakawa3, K. Hirakawa1, E. Ideguchi1, K. Matsuta2, M. Mihara2, S. Noji1, T. Shima1, H. Shimizu3, R. Tang1, T. D. Trong1, H. Yamaguchi3, L. Yang3 1 Research Center for Nuclear Physics, Osaka University 2 Department of Physics, Osaka University 3 Center for Nuclear Study, University of Tokyo 4 Institute for Basic Science, Korea The overestimation of primordial 7Li abundance in the standard Big-Bang Nucleosynthesis (BBN) is one of the known and unresolved problems in nuclear astrophysics. The latest theoretical prediction of the primordial 7Li abundance is still a factor of 2 to 3 times higher than the recent precise observation [1]. A key to solve this discrepancy is the destruction of 7Be, for which the 7Be(d, p)8Be and 7Be(n, α)4He are the two promising processes, and it is suggested that a contribution from 7Be(d, p)8Be reaction is bigger than 7Be(n, α)4He reaction [2]. As for this experiment, we are focusing on 7Be(d, p) reaction. Although the reaction cross sections have been measured in normal and inverse kinematics conditions [3] [4], the former result was not reached critical energy region and the accuracy of the later one was not enough. In this study we plan to improve the accuracy of the cross section, by performing the measurement with normal kinematics using a novel method, which we call it as an “activated target”. We produced 7Be using 7Li solid target via 7Li(p, n) reaction and perform the 7Be(d, p) reaction experiment at Van de Graaff facility, Osaka University. As a result, we could measure the 7Be(d, p) reaction using the activated target. We are also developing a method of implantation target. We will implant 7Be ions to a gold plate target and perform a measurement experiment of 7Be(d, p) reaction. We are measuring the 7Be(d, p) reaction in various methods. We will report the results, future prospects and the progress of the development of the implantation method. [1] R. H. Cyburt et al., J. Cosmol. Astropart. Phys. 11, 012 (2008). [2] S. Q. Hou et al., Phys. Rev. C 91, 055802 (2015). [3] R. W. Kavanagh et al., Nuclear Physics 18 492-501 (1960) [4] C. Angulo et al., Astrophys. J. 630, L105 (2005).