Workshop on a new ONOKORO proposal




In the workshop, physics cases and technical aspects of  a new proposal of cluster knockout reaction studies to the next NP-PAC will be dicussed. It is under the ONOKORO project and will be a big proposal combining a series of experiments with several primary beams (proposal of scientific program, like SEASTAR).


The plan is:

     1. (p,pX) cluster knockout experiments at E/A~250 MeV for

             neutron-deficient and -rich Sn isotopes (A=106--110, 126--134)

             alpha-decay 214--220Th nuclei

                        (basically same as Junki Tanaka's previous proposal)

             N=Z nuclei around 56Ni

      2. TOGAXSI array will be used for detection of scattered proton and

          knocked-out clusters

      3. Knocked-out cluster (X) include d, t, 3He, alpha, pp (, and p as a byproduct)

      4. (at least some of) Decay charged particles will be detected together with neutrons

The each campaign will be carried out a cocktail beam including ~10 (or more) isotopes and the obtained data (10 isotopes X 5--6 reaction channels) will be quite wealthy.


We tentatively assigned campaign organizers and channel organizers as

      Campaign organizers:

             Sn isotopes: Juzo Zenihiro (Kyoto)

             Th isotopes: Junki Tanaka (RCNP)

             N=Z nuclei:  Yuki Kubota (RIKEN)

       Channel organizers:

             (p,pd):  Yuki Kubota (RIKEN) , Stefanos Paschalis (York)

             (p,pt)/(p,p3He): Ryotaro Tsuji (Kyoto/RIKEN) , Valerian Alcindor (IJCLab)

             (p,palpha): Junki Tanaka (RCNP), Zaihong Yang (Peking)

  (p,3p): Kenjiro Miki (Tohoku)

             Decay: Shumpei Koyama (GANIL)

In future, some more members will be invited to channel organizers.


We welcome proposals from everybody in the ONOKORO and SAMURAI collaborations to take part in the experiment and the data analysis of nuclides/channels of your interest.


We organize a small online workshop to discuss physics cases and collaboration as follows:

      12th (Tue) September 16:00--20:00JST (9:00--13:00 CEST)

       Zoom link:     


This workshop is a good opportunity for us to share your interests and possibility to initiate new collaborations.

    • 4:00 PM 4:20 PM
      Overview of the ONOKORO project 20m
      Speaker: Tomohiro Uesaka (RIKEN Nishina Center)
    • 4:20 PM 4:40 PM
      Current status of TOGAXSI 20m
      Speaker: Ryotaro Tsuji (Kyoto univ.)
    • 4:40 PM 5:00 PM
      Sn isotope campaign 20m
      Speaker: Juzo ZENIHIRO (Department of Physics, Kyoto University)
    • 5:00 PM 5:20 PM
      Th isotope campaign 20m
      Speaker: Junki Tanaka (Riken, Nishina Center)
    • 5:20 PM 5:40 PM
      N=Z campaign 20m
      Speaker: Yuki Kubota (RIKEN Nishina Center)
    • 5:40 PM 5:55 PM
      Break 15m
    • 5:55 PM 6:10 PM
      From SAMURAI 15m
      Speaker: Hideaki Otsu (RIKEN Nishina Center)
    • 6:10 PM 6:25 PM
      Interests from Peking 15m
      Speaker: Dr Zaihong Yang (Peking University)
    • 6:25 PM 6:40 PM
      Interests from York 15m
    • 6:40 PM 6:55 PM
      Interests from IBS 15m
      Speaker: Dr Sunji Kim
    • 6:55 PM 7:10 PM
      (p,pt)/(p,p3He) channel 15m
      Speaker: Ryotaro Tsuji (Kyoto univ.)
    • 7:10 PM 7:25 PM
      Interests from IJCLab 15m
      Speaker: Didier Beaumel (IPN Orsay / RIKEN Nishina center)
    • 7:25 PM 7:40 PM
      Cluster emission 15m
      Speaker: Shunpei KOYAMA (Department of Physics, University of Tokyo)
    • 7:40 PM 7:55 PM
      Interests from Beihang 15m
      Speaker: Baohua Sun (Beihang University)
    • 7:55 PM 8:10 PM
      Two-nucleon knockout 15m
      Speaker: Hongna Liu (TU Darmstadt)