Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
-decay and delayed neutron of odd nuclei including core polarization effectMinato, Futoshi
no journal, ,
There are various theoretical works based on mean-field theory + quasiparticle random phase approximation (QRPA) calculating -decay half-lives of nuclei. For the moment, they are the only approaches that are based on a microscopic theory applicable for the systematical calculation in the nuclear chart. A special attention is needed when calculating odd nuclei because of the presence of core polarization effect (CPE). However, the systematical calculation of aforementioned microscopic theories has approximated the calculation of odd nuclei in a simple way. This may cause a problem when predicting unmeasured half-lives, delayed neutron (DN) emission probabilities, etc. For this background, the CPE on -decay and DN are investigated. We assume that odd nucleus consists of active even-even nucleus and valence particle(s), and use a perturbation theory to estimate the CPE. Core phonon states to be excited are calculated by HFB + QRPA. We found the CPE mitigates an odd-even straggling of half-lives found in no CPE calculations, which is consistent with experiments.
Orlandi, R.; Makii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; Asai, Masato; Tsukada, Kazuaki
no journal, ,
Makii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; Orlandi, R.; Yan, S. Q.*; L
guillon, R.; Smallcombe, J.*; Vermeulen, M. J.; Nishinaka, Ichiro*; Tsukada, Kazuaki; et al.
no journal, ,
A project of the fission data measurement as well as the measurement of the neutron capture cross sections, using a surrogate method based on multi-nucleon transfer reactions, is running at JAEA. We have constructed appatus consists of a fission setup including four position-sensitive multi-wire proportional counters (MWPCs) to detect fission fragments and a capture setup containing two anti-Compton LaBr
(Ce) spectrometers to measure the 
rays from the populated compound nuclei. Both setups contain a Si 
E-E detector to detect outgoing projectile-like particles by which we can identify the populated compound nuclei. We also placed 33 scintillators around the fission setup to detect fission neutrons in coincidence with the fission fragments. The measurements was carried out at the JAEA-Tokai tandem accelerator facility. In this contribution, we will present our results on neutron-induced fission and neutron capture cross sections by using the surrogate method.
Yoshida, Kazuki
no journal, ,
In this talk I will overview recent achievements and remaining questions to resolve the quenching problem, from knockout reaction theory point of view in particular. For extracting spectroscopic factors from knockout experiment, quantitative accuracy of the reaction theory adopted to reaction analysis is, of course, essential. I will introduce our recent study on validity of three reaction theories for knockout analysis, i.e., Distorted Wave Impulse Approximation (DWIA), Transfer-to-the-Continuum model (TC), and Faddeev/Alt-Grassberger-Sandhas method (FAGS). In this study it has been shown that DWIA, which is the model most commonly adopted to knockout reaction analyses, gives consistent knockout cross section with those of TC and FAGS, once the same ingredients are given to the reaction calculation. I also introduce a possible reason for the systematic quenching found in nucleon removal reaction analysis. The key will be the adiabatic approximation.
Tanaka, Shoya; Hirose, Kentaro; Nishio, Katsuhisa; Aritomo, Yoshihiro*
no journal, ,
Recently, fission-fragment mass distributions (FFMDs) were measured for 
U, 
Np, and 
Pu populated in the excitation-energy range from 10 to 60 MeV by multinucleon transfer channels in the reaction 
O + 
U at the Japan Atomic Energy Agency tandem facility. A persistence of predominantly asymmetric FFMDs was observed up to the highest measured excitation energy for all the studied nuclides. To understand this behavior, we use the fluctuation-dissipation model and employ Langevin equations to obtain FFMDs and clarify multichance fission (MCF) effects. FFMDs are calculated for twenty-nine compound nuclides 
Th, 
Pa, 
U, 
Np and 
Pu with the excitation energy range from 15 to 55 MeV. The calculation results show generally good agreement with experimental data. It was shown that a reliable understanding of the observed FFMDs can be obtained only by invoking MCF.
-hypernucleiNanamura, Takuya; Ichikawa, Yudai; Nagae, Tomofumi*; Ekawa, Hiroyuki; Tanida, Kiyoshi
no journal, ,
Spectroscopic study of -hypernuclei provides insights into the -
interaction and the 
coupling strength. A missing mass spectroscopy of the -hypernuclei was performed via the 
C
reaction at J-PARC K1.8 beam line in 2015. In this measurement, we have achieved the missing mass resolution 5.4 MeV (FWHM). It is important to achieve a better missing mass resolution. As the next step, we are constructing a new spectrometer S-2S (Strangeness -2 Spectrometer) for the 
. In this condition, the total missing-mass resolution would be affected mainly due to the target energy loss straggling. To reduce energy loss straggling in the target, we are developing an active target composed of scintillating fibers. We will present status of developments of these detectors.
in the Skyrme modelEzoe, Takashi; Hosaka, Atsushi; Maruyama, Toshiki
no journal, ,
The is well-known as a candidate of the exotic hadron whose properties can not be easily explained by a simple three-quark state. To determine the properties of the is one of the most important tasks in hadron physics. Recently, the is considered to be a resonance of the 
and 
channels, which is well-known as the double-pole structure. To investigate the , as a first step, we have considered the channel by the Skyrme model, which is able to describe the hadron properties well and describes baryon as a soliton with structure of finite size. As a result, we have found one bound state with the binding energy of order 10 MeV, which means that the bound state is a weakly binding object of the 
and . We shall include the coupling of and 
channels as a next step.
rays in 
U(n
,f)Ogawa, Tatsuhiko; Makii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; Orlandi, R.; Lguillon, R.*; Soldner, T.*; Hambsch, F.-J.*; A
che, M.*; Astier, A.*; et al.
no journal, ,
Measurement of -rays emitted from fission of actinide has been conducted for radiation transport analysis in reactors, safety of spent fuel, and fundamental nuclear physics. In earlier studies, -rays up to 8 MeV were measured because they are those emitted by fission fragments at excited states. According to some theoretical studies, however, some fission fragments have excitation energy up to 20 MeV and they emit -rays above 8 MeV. In this study, the -rays produced by fission of U induced by thermal neutrons were measured with LaBr scintillators at the high-flux reactor in the Institut Laue Langevin. The obtained -ray spectrum agreed with the earlier measurement below 8 MeV, forms a bump above 10 MeV, and smoothly continued up to 20 MeV. The measurement in this study clarified the -ray energy spectrum attributed to fission reactions up to 20 MeV in case of U(n,f).
Es region by Coulomb excitation -ray spectroscopyYanagihara, Rikuto; Ideguchi, Eiji*; Nishio, Katsuhisa; Orlandi, R.; Makii, Hiroyuki; Asai, Masato; Hirose, Kentaro; Tsukada, Kazuaki; Toyoshima, Atsushi; Sato, Tetsuya; et al.
no journal, ,
Okudaira, Takuya
no journal, ,
The technology development section carries out the development of the neutron polarization device. Polazied neutrons are used frequently in the experiment of the particle physics. Therefore. it is necessary to cooperate with the scientists in particle physics for further developments. The matter-dominated universe cannot be explained by the standard model, and searches for new physics are carried out in the world. One of the ways is a measurement of symmetry violation using polarized neutrons and nuclei. For example, experiments to measure parity violation using the polarized neutrons and light nuclei are conducted to search for the unknown physics in quark-quark interaction. The unknown time reversal violation can be enhanced in La(n, ) with polarized neutrons, and the fundamental study to search for T-violation is ongoing using MLF. We will present the overview of the experiments for symmetry violation using polarized neutrons and the neutron polarization device.
Gubler, P.
no journal, ,
In this talk, I will introduce and review several exact sum rules of the vector channel spectral function at finite temperature, which we have derived in a recent paper. I will also discuss an explicit check of these sum rules in perturbation theory and possible application to the analysis of lattice QCD data.
interaction; Meson exchanges, inelastic channels, and quasibound stateSekihara, Takayasu; Kamiya, Yuki*; Hyodo, Tetsuo*
no journal, ,
C(K
, p) analysis of the J-PARC E05 pilot runSako, Hiroyuki; Tanida, Kiyoshi; Hasegawa, Shoichi; Sato, Susumu; Ichikawa, Yudai
no journal, ,
CaUtsuno, Yutaka; Ichikawa, Takatoshi*; Shimizu, Noritaka*; Otsuka, Takaharu*
no journal, ,
no abstracts in English
Hirose, Kentaro; Nishio, Katsuhisa; Tanaka, Shoya*; Leguillon, R.*; Makii, Hiroyuki; Nishinaka, Ichiro*; Orlandi, R.; Tsukada, Kazuaki; Smallcombe, J.*; Vermeulen, M. J.*; et al.
no journal, ,
dibaryon resonances in the phenomenological potential modelOka, Makoto
no journal, ,
and 
daibaryon resonances are analyzed by the complex scaling method for the phenomenological potential model. We find possible Feshbach resonances.
resonance near the 
threshold at J-PARC