Studying astrophysical reactions with low-energy RI beams at CRIB

¹ Center for Nuclear Study (CNS), University of Tokyo, Tokio, Japan
² INFN - Laboratori Nazionali del Sud, Catania, Italy
³ RIKEN Nishina Center, Wako, Saitama, Japan
⁴ Institute for Basic Science, Daejeon, Korea
⁵ Dipartimento di Fisica e Astronomia, Università di Catania, Catania, Italy
⁶ Università “Kore”, Enna, Italy
⁷ Department of Physics, Tohoku University, Tohoku, Japan
⁸ Department of Physics, Kyushu University, Kyushu, Japan
⁹ Department of Physics, Kyoto University, Kyoto, Japan
¹⁰ 30 MeV Cyclotron Center, Tran Hung Dao Hospital, Hanoi, Vietnam
¹¹ Institute of Physics, Vietnam Academy of Science and Technology, Hanoi, Vietnam
¹² Dong Nai University, Dang Nai, Viatnam
¹³ Department of Physics, Yamagata University, Yamagata, Japan
¹⁴ Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, Orsay, France
¹⁵ Institut de Physique Nucleaire, Orsay, France
¹⁶ Institute for Nuclear Research (MTA-Atomiki), Debrecen, Hungary
¹⁷ Technische Universität München, München, Germany

Published online: 11 May 2016

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 ⁷Li and ⁷Be beams. This study is related to the astrophysical ⁷Li/⁷Be(α,γ) reactions, important at hot p-p chain and νp-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 ¹⁸F(p, α)¹⁵O reaction at astrophysical energies via the three body reaction ²H(¹⁸F, α¹⁵O)n. The ¹⁸F(p, α) ¹⁵O 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.