Studying astrophysical reactions with low-energy RI beams at CRIB

H Yamaguchi,M Gulino,S Romano,M La Cognata,S Hayakawa,F Hammache,D Kahl,Y K Kwon ,C Spitaleri,A Coc,S Cherubini,Takashi Hashimoto ,N De Séréville ,G G Rapisarda ,Nguyễn Ngọc Duy ,S Bishop,Yukihiro Sakaguchi ,T Komatsubara,L Lamia,G G Kiss ,Y Wakabayashi,N Iwasa,D N Binh ,Takashi Teranishi ,S Kubono,L H Khiem ,S Kato,T Kawabata

doi:10.1051/epjconf/201611709005

Abstract

Studies on nuclear astrophysics, nuclear structure, and other interests have been performed using the radioactive-isotope (RI) beams at the low-energy RI beam separator CRIB, operated by Center for Nuclear Study (CNS), the University of Tokyo. A typical measurement performed at CRIB is the elastic resonant scattering with the inverse kinematics. One recent experiment was on the α resonant scattering with 7 Li and 7 Be beams. This study is related to the astrophysical 7 Li/ 7 Be( α , γ ) reactions, important at hot p-p chain and ν p-process in supernovae. There have also been measurements based on other experimental methods. The first THM measurement using an RI beam has been performed at CRIB, to study the 18 F( p , α ) 15 O reaction at astrophysical energies via the three body reaction 2 H( 18 F, α 15 O) n . The 18 F( p , α ) 15 O reaction rate is crucial to understand the 511-keV γ -ray production in nova explosion phenomena, and we successfully evaluated the reaction cross section at novae temperature and below experimentally for the first time.

Highlights

CRIB [1,2] is a radioactive-isotope (RI) beam separator operated by Center for Nuclear Study (CNS), the University of Tokyo, installed at the RIBF facility of RIKEN Nishina Center
The measurement of the 7Be+α scattering allows us to evaluate the rate of the 7Be(α, γ) reaction, which is considered to play an important role in the hot p-p chain and related reaction sequences [23]
We calculated the resonant reaction rate and compare it with the total reaction rate evaluated in NACRE [28, 29]

Summary

Introduction

CRIB [1,2] is a radioactive-isotope (RI) beam separator operated by Center for Nuclear Study (CNS), the University of Tokyo, installed at the RIBF facility of RIKEN Nishina Center. The measurement of the 7Be+α scattering allows us to evaluate the rate of the 7Be(α, γ) reaction, which is considered to play an important role in the hot p-p chain and related reaction sequences [23]. The resonant reaction rate should be evaluated more precisely by determining α widths for the resonances at high temperatures.

Results

Conclusion