Production of isomers around <sup>52</sup>Fe nucleus via projectile fragmentation

ORAL

Abstract

 Nucleosynthesis heavier than iron in the supernova explosion is one of the attractive topics. Electron capture rates of nuclei near iron are inputs for network calculation. The electron capture rate above beta-decay threshold can be estimated from the strength distribution of the charge exchange reactions.Nuclei in high temperature circumstances may be in excited state, and then the information of charge exchange reaction from excited state is desired.
One possible way to perform the reaction study on excited state is to measure the reactions of isomer beams in inverse kinematics. 52Fe(12+) at Ex=7 MeV is a good candidate around iron nuclei. We measured the isomer ratio ,aiming to clarify the production mechanism of isomer via projectile fragmentation .

 Experiments  were performed at HIMAC. The isomer ratio around 52Fe are measured by using projectile fragmentation from 58Ni(0+),59Co(7/2-) and 82Kr(0+) at 350MeV/u with changing longitudinal momentum transfer, transverse momentum transfer and incident nucleus. To obtain the transverse momentum dependence the incident beam angle to the target was changed. The typical isomer ratio of 52Fe is larger than 5 %.

The results on the isomer ratio around Fe will be presented.

*This work was supported by JSPS KAKENHI Grant Number JP15H03672

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Presenters

  • Keita Kawata

    • Center for Nuclear Study, University of Tokyo

Authors

  • Keita Kawata

    • Center for Nuclear Study, University of Tokyo

  • Shinsuke Ota

    • Center for Nuclear Study, the University of Tokyo

  • Masanori Dozono

    • Center for Nuclear Study, the University of Tokyo
    • Center for Nuclear Study, The University of Tokyo

  • Shin'ichiro Michimasa

    • Center for Nuclear Study, the University of Tokyo
    • Center for Nuclear Study, University of Tokyo
    • CNS, Univ. of Tokyo
    • CNS, University of Tokyo

  • Hiroki Nishibata

    • RIKEN Nishina Center
    • RIKEN

  • Chihiro Iwamoto

    • CNS, University of Tokyo
    • Center for Nuclear Science, University of Tokyo
    • Center for Nuclear Study, the University of Tokyo

  • Noritaka Kitamura

    • Center for Nuclear Study, University of Tokyo
    • Center for Nuclear Study, the University of Tokyo
    • CNS, the University of Tokyo

  • Shoichiro Masuoka

    • Center for Nuclear Study, University of Tokyo
    • RIKEN, Toho, Osaka, TITech, Miyazaki, LPC Caen, Tokyo
    • Center for Nuclear Study, the University of Tokyo

  • Rieko Tsunoda

    • Center for Nuclear Study, the University of Tokyo, Tokyo Univ.
    • Center for Nuclear Study, the University of Tokyo

  • Tomoya Harada

    • Department of Physics, Toho University
    • Toho Univ. / RIKEN

  • Hideyuki Sakai

    • RIKEN
    • RIKEN Nishina Center, RIKEN
    • RIKEN Nishina Center

  • Nobu Imai

    • Center for Nuclear Study, the University of Tokyo
    • CNS, Univ. of Tokyo
    • Center for Nuclear Study, University of Tokyo
    • CNS, the University of Tokyo

  • Kentaro Yako

    • Center for Nuclear Study, The University of Tokyo
    • Center for Nuclear Study, the University of Tokyo

  • Tomoya Sato

    • RIKEN Nishina Center