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Abstract
Our research goal is to measure the 7Be(d, p) reaction to shed light on the 7Li problem in the Big-Bang Nucleosynthesis. We are developing an unstable 7Be target for a high-resolution measurement of the 7Be(d, p)8Be reaction. We plan to compare two methods to producethe 7Be target: (1) Activation method, and (2) Implantation method. We performed an activation methodexperiment at the Van de Graaff at Osaka University, and obtained the cross-section data. A second experiment to obtain more accurate data will take place at the Tandem Electrostatic Accelerator, Kobe University. We have also made a 7Be target with implantation method at CRIB, Center for Nuclear Study, Univer-sity of Tokyo. An experiment to measure the (d, p) reaction with the implanted target is scheduled for 2018 at Japan Atomic Energy Agency, tandem facility.
Highlights
The overestimation of primordial 7Li abundance in the standard Big-Bang Nucleosynthesis (BBN) model is one of the known and unresolved problem
The difference is quite large while the abundance of the other light nuclei are reproduced well. This is one of the biggest problems in the BBN models and it illustrates the incomplete knowledge of the processes of the primordial formation of our universe
Light nuclei were produced up to 7Be by nuclear reactions in several hundred seconds following the Big Bang (Figure ??). 7Li nuclei were predominantly produced by the β decay of 7Be in the standard BBN model
Summary
The overestimation of primordial 7Li abundance in the standard Big-Bang Nucleosynthesis (BBN) model is one of the known and unresolved problem. ]. The difference is quite large while the abundance of the other light nuclei are reproduced well. This is one of the biggest problems in the BBN models and it illustrates the incomplete knowledge of the processes of the primordial formation of our universe. Light nuclei were produced up to 7Be by nuclear reactions in several hundred seconds following the Big Bang (Figure ??). 9th European Summer School on Experimental Nuclear Astrophysics than the timescale of the production of light nuclei after the Big Bang. We focus on the 7Be(d, p)8Be reaction since the contribution from 7Be(d, p)8Be is suggested to be larger than 7Be(n, α)4He [? ? ]
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