Periodic Reporting for period 1 - ProHyPro (Production and decay of Hypernuclei by using an intense heavy-ion beam incidenting on a Proton target)
Reporting period: 2016-06-01 to 2018-05-31
In the past decades, (K-, pi-), (pi+, K+) and (e, e’K+) reactions has been widely used to produce hypernuclei in the laboratories. In these reactions, stable targets are used, and therefore most of the studied hypernuclei are limited to on/near the beta-stability line. New techniques aiming to produce exotic hypernuclei (neutron-rich or proton-rich) are ongoing which is important to obtain knowledge of the YNN three-body interaction and the density dependence of the YN interaction. This project (ProHyPro) aims at investigating the production and decay of hypernuclei by using an intense heavy-ion beam interacting with a proton target.
2. In the ion-beam induced reactions, the produced kaon mesons signal the strangeness production. However, coincidence measurement of hypernuclei with kaon mesons has never been successfully performed due to the difficulty in the kaon identification. During the project, a series of simulations have been performed for the kaon detection. A time projection chamber inside of the R3B-GLAD magnet was finally determined to be the best choice. The kaon meson can be identified using the Bρ-dEdx method. The development of the TPC is in line with the common interests among the R3B collaboration. The feasibility is still under investigation due to the highly non-uniform magnetic field of the GLAD magnet. Dr. Sun was involved in the R3B collaboration and the R3B-TPC working group. He is also performing the TPC simulation in collaboration with A. Corsi from CEA and A. P. Hector from USC.
3. Unfortunately, the HypHI experiment as well as the first R3B campaign both were not scheduled during the project due to the delay of the beam time at GSI. The experimental program at GSI can start only around February in 2019. Instead Dr. Sun grasped good opportunities to join two experiments performed at RIBF at RIKEN, Japan: SEASTAR campaign in 2017 (as a key member) and SAMURAI 18O campaign in 2018 (as the spokesperson), which were with similar setup as R3B. In particular, a TPC was used as a reaction vertex tracker in SEASTAR campaign in 2017, and Dr. Sun built valuable experience by taking care of the data analysis for one of the main reaction channels from this campaign (the data from the RIKEN experiments). The data analysis has been finalized and the manuscript is distributed among the collaborators.