Direct measurement of Li+d reactions of astrophysical interest

Hashimoto, Takashi; Ishiyama, Hironobu*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Miyatake, Hiroari; Jeong, S. C.*; Tanaka, Masahiko*; Yoshikawa, Nobuharu*; Nomura, Toru*; Mitsuoka, Shinichi; Nishio, Katsuhisa   ; Sato, Tetsuya   ; Ichikawa, Shinichi; Ikezoe, Hiroshi; Osa, Akihiko  ; Matsuda, Makoto  ; Das, S. K.*; Mizoi, Yutaka*; Fukuda, Tomokazu*; Sato, Akihiko*; Shimoda, Tadashi*

Nuclear reactions involving Li are thought to be key reactions to synthesize heavier elements in the early universe and supernovae because of filling a gap of mass number=8. Direct cross-section measurement of Li(d,x), (x = t,p,) reactions was performed in the energy region of astrophysical interest, covering the Gamow peaks of T=1-3. The Li beam at 7 different energies from E=0.3 to 1.2 MeV was provided by Tokai Radioactive Ion Accelerator Complex (TRIAC). The experiment was carried out using a CD target and large-area position sensitive silicon detectors. This measurement provides the first data of cross sections in the low-energy region below E=1.5 MeV. The analysis of the Li(d,t)Li reaction measurement has been completed. An enhancement on the excitation function was observed at around E = 0.8 MeV and its energy corresponds to the excitation energy of E=22.4 MeV in Be, where an excited state was previously reported. The new astrophysical nuclear reaction rate will be presented and the contribution to the r-process nucleosynthesis will be discussed. Also, the preliminary result of the Li(d,p)Li reaction will be presented.