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-decay of neutron-rich nuclei by QRPA method using a finite-range 
pairing forceMinato, Futoshi
no journal, ,
no abstracts in English
Koura, Hiroyuki; Endo, Fumitaka*
no journal, ,
no abstracts in English
scattering events in the J-PARC E40 experimentNanamura, Takuya; Ichikawa, Yudai; Hayakawa, Shuhei; Yoshida, Junya; Miwa, Koji*; Honda, Ryotaro*; Akazawa, Yuya*; Yamamoto, Takeshi
no journal, ,
Hyperon-nucleon scattering experiment is one of the powerful methods for studying YN interaction. However, it is difficult due to short lifetime of hyperon. 
scattering experiments were performed as KEK E251 and KEK E289 in order to measure the differential cross sections. In these experiments, statistics were limited to less than 100 events and differential cross section had too large statistical errors to restrict baryon-baryon interaction models. J-PARC E40 experiment aims for measuring cross sections of 
scatterings with high statistics (
10000 events) by overcoming difficulties of hyperon-nucleon scattering experiment. By using high rate (
19M /spill) 
beam and large acceptance spectrometer, we can produce and tag large amount of 
beam. LH
target and surrounding detector system CATCH enable us to reconstruct reactions from two body kinematics. Our experimental group completed 
data taking and about half of 
data taking by 2019 Apr. Left data taking will be performed in the end of this fiscal year.
Tanida, Kiyoshi; Belle Collaboration*
no journal, ,
no abstracts in English
Yoshida, Junya; Hayakawa, Shuhei; Ekawa, Hiroyuki*; Yoshimoto, Masahiro*; Kasagi, Ayumi*; Lin, P. M.*; Nyaw, A. N. L.*; Nakazawa, Kazuma*
no journal, ,
J-PARC E07 is an experiment with the photographic emulsion technique to detect 10 times higher statistics of double hypernuclei compared to the past experiments. This experiment aims to obtain quantitative data on 
- and 
-nucleon interaction, by the mass measurement of various double hypernuclei. As of July 2019, we have scanned about 53% of 1300 emulsion sheets at least once and detected about 30 candidate events of double hypernuclei. We start a study of the branching ratio of the decay mode with the accumulating data. However, the detection efficiency is about half of the designed value. It is due to the rugged surface position of emulsion module. We are developing the correction method to reconstruct its original geometry by using proton tracks which punch through SSD and emulsion sheets.
Yoshida, Kazuki; Qi, C.*
no journal, ,
In 
-decaying nuclei, the formation amplitude and the penetrability are important factors to determine its decay halflife. In this research, by utilizing the knockout reaction, which is known to be a good probe for the clustering in light nuclei, we aim to investigate the formation amplitude of decaying nuclei, independent from the decaying process and the penetrability. We also discuss a relationship between an formation amplitude and the knockout cross section and its momentum distribution.
Yotsuzuka, Mai*; Iijima, Toru*; Inami, Kenji*; Sue, Yuki*; Iinuma, Hiromi*; Nakazawa, Yuga*; Saito, Naohito; Hasegawa, Kazuo; Kondo, Yasuhiro; Kitamura, Ryo; et al.
no journal, ,
The J-PARC E34 experiment aims to measure the muon anomalous magnetic moment and the electric dipole moment with a high precision. In this experiment, thermal muonium is produced and ionized by laser resonance to generate ultra-slow muons, which are then accelerated in a multistage muon linac. In order to satisfy the experimental requirements, suppression of the emittance growth during the acceleration is necessary. Because the main cause of the emittance growth is beam mismatching between the accelerating stages, the transverse and longitudinal beam monitoring is important. The longitudinal beam monitor has to measure the bunch length with the resolution equivalent to tens of picoseconds, which is 1% of the acceleration phase of 324 MHz. In addition, it should be sensitive to single muon because the beam intensity is limited during the commissioning phase. To realize above requirements, we are developing a longitudinal beam monitor with a micro channel plate, and the test bench to evaluate the monitor performance. So far, the time resolution of the beam monitor was obtained to be 65 ps in RMS including the jitter on the test bench. We also succeeded in measuring the longitudinal bunch size of the muon beam accelerated by RFQ using the beam monitor. In addition, a beam transport system using this monitor is designed. In this paper, the results of the performance evaluation for this beam monitor and a preriminaly result of the beam transport design are reported.
Tanaka, Shoya; Nishio, Katsuhisa; Hirose, Kentaro; Aritomo, Yoshihiro*
no journal, ,
no abstracts in English
Hayakawa, Shuhei; Sako, Hiroyuki; Ichikawa, Yudai
no journal, ,
no abstracts in English
CaUtsuno, Yutaka; Ichikawa, Takatoshi*; Shimizu, Noritaka*; Otsuka, Takaharu*
no journal, ,
no abstracts in English
Sato, Susumu
no journal, ,
In J-PARC E16 experiment, for the first beam time in the coming February 2020, the sophisticated detector system for measuring hadron spectra via 
pair decay, for example 
, is being installed and commissioned. In addition to these detectors, hadron identification detector using time-of-flight technique with MRPC devices, is under development. These devices would expand capabilities to study changes of the hadron properties in the various status of matter, with the scope to measure the chiral symmetry restoration in the matter. In this presentation, the latest status of development and the performance are presented and discussed.
Suzuki, Kei; Ishikawa, Tsutomu*; Nakayama, Katsumasa*; Suenaga, Daiki*
no journal, ,
D mesons are expected to be clear probes of the chiral condensate. For the Casimir effect in the QCD vacuum, non-perturbative properties of the QCD vacuum are modified by the volume size and boundary conditions. In this talk, we focus on the modification of the chiral symmetry breaking by the Casimir effect and the response of D mesons. By using an effective Lagrangian based on chiral partner structures for D mesons, we discuss the dependences on volume, boundary, and temperature, and the applications to lattice QCD simulations.
meson mass region for pA reactions at 12 GeVGubler, P.
no journal, ,
Based on my recent research, I will present results on numerical simulations of pA reactions (p: proton, A: nucleus). I will specially explain in detail the experimentally measurable di-lepton spectrum that results from this sort of reaction. Furthermore, I will discuss what kind of meson spectral function best reproduces the experimental results obtained so far.