Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session DE: Mini-symposium on Strangeness Nuclear Physics Today and Tomorrow II
9:00 AM–11:30 AM,
Thursday, October 25, 2018
Hilton Room: King's 1
Chair: Hirokazu Tamura, Tohoku University
Abstract ID: BAPS.2018.HAW.DE.6
Abstract: DE.00006 : Preparation status of the hypernuclear gamma-ray spectroscopy for Λ's g-factor in a nucleus (J-PARC E63)*
10:15 AM–10:30 AM
Properties of baryons in nuclear matter may be changed from those in free space because of its high density. However, nucleons deep inside a nucleus cannot be probed due to very short life time of the highly excited states. On the other hand, hyperons are free from Pauli effect from nucleons in a nucleus. Thus, hyperons can be a good probe to investigate possible modification of baryons in a nucleus.
We plan to study modification of a Λ particle in a nucleus by measuring that of the magnetic moment. Λ's magnetic moment can be derived from the lifetime of spin flip M1 transition. Therefore we proposed a γ ray spectroscopy of hypernuclei (J-PARC E63) at the K1.1 beam line in J-PARC. We will measure the γ ray of spin flip M1 transition by Ge detectors array (Hyperball-J) to obtain the lifetime using Doppler Shift Attenuation Method (DSAM). DSAM is a method to obtain the lifetime from γ ray peak shape which is determined by lifetime and stopping time of hypernuclei in a nucleus. For this purpose, a lithium oxide target, which has uniform density, is very important. Now we are challenging to produce the crystal of lithium oxide.
In this presentation, we will introduce about the J-PARC E63 experiment and report the preparation status.
*Grant No. JP15H02079, No. JP24105003
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.DE.6
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