Production of isomers around 52Fe 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.

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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