Proceedings of the 2021 Symposium on Nuclear Data; November 18-19, 2021, On-line Connection Conference

Yamaguchi, Yuji; Meigo, Shinichiro

JAEA-Conf 2022-001, 226 Pages, 2022/11

JAEA-Conf-2022-001.pdf:17.97MB

The 2021 Symposium on Nuclear Data was held as an online connection conference on November 18-19, 2021. The symposium was organized by the Nuclear Data Division of the Atomic Energy Society of Japan (AESJ) in cooperation with the Sigma Investigative Advisory Committee of AESJ, J-PARC Center, Nuclear Science and Engineering Center of Japan Atomic Energy Agency (JAEA), and High Energy Accelerator Research Organization (KEK). In the symposium, tutorials "New Developments in TALYS and TENDL-2021" and "Role of ADS and its Development Issues" were proposed and held. Three sessions of lectures and discussions were held: "J-PARC and JAEA Facilities", "Current Status and Future Prospects of Nuclear Data Research", and "Medical, Isotope Production, and Analysis". In addition, recent research progress on experiments, nuclear theory, evaluation, benchmark, and applications were presented in the poster session. The total number of participants was 132 participants. Each oral and poster presentation was followed by an active question and answer session. This report consists of a total of 36 papers including 14 oral and 22 poster presentations.

-particle breakup at incident energy of several hundreds of MeV/u

Yamaguchi, Yuji*; Araki, Yusuke*; Fujii, Motoharu*; Watanabe, Gaku*; Sanami, Toshiya*; Matsufuji, Naruhiro*; Koba, Yusuke*; Iwamoto, Yosuke; Uozumi, Yusuke*

no journal, , 

For heavy-ion cancer therapy with carbon, there is a problem about radiation exposure due to secondary particles produced by heavy ion incident reaction. We have a plan to extend our improved intra nuclear cascade (INC) model for proton incidences to INC model for alpha and carbon incidences. However, there is no experimental data about multi-particle (proton, deuteron, triton, He and alpha) production double differential cross sections (DDXs) for alpha incident reactions to validate the extended INC model. In this work, we measured multi-particle production DDXs for 100 and 230 MeV/nucleon alpha incident reactions on samples (C, Al, Co, Nb) at the HIMAC building in National Institute of Radiological Sciences (NIRS), QST. As a result, we found that results calculated by the extended INC model agreed with experimental data at 30 degrees and those underestimated the experimental data with increasing angles.

Measurement of radioisotope production by muon capture

Yamaguchi, Yuji; Harada, Masahide; Kawamura, Naritoshi*; Haga, Katsuhiro

no journal, , 

A negative muon () is captured by a nucleus in many cases when the enters the material. After the nuclear capture, a highly excited (Z-1) nucleus is produced and de-excites via the emission of neutrons and -rays. Because this process can make radioisotpes, the material can be activated. To handle the activated sample safely and properly in the MLF, it is important to estimate its radioactivity accurately. The estimation can be performed using Monte-Carlo simulation code, PHITS. Because the reliability of PHITS results has an impact on radiation safety, benchmark of calculation is required. However, the calculation results cannot be verified due to limited data in terms of Z. It is confirmed that there exist discrepancies between calculation and experimental data. Therefore, comprehensive data of radioisotope production are desired. In this presentation, we report on the preliminary experiment to establish methodology for taking comprehensive data.

Measurement of of 230 MeV/u incident charged particles production double differential cross section

Furuta, Toshimasa*; Uozumi, Yusuke*; Yamaguchi, Yuji; Iwamoto, Yosuke; Sanami, Toshiya*; Koba, Yusuke*

no journal, , 

no abstracts in English

Preliminary experiment for measurement of radioisotope production from negative muon capture

Yamaguchi, Yuji; Harada, Masahide; Kawamura, Naritoshi*; Haga, Katsuhiro

no journal, , 

no abstracts in English

Measurement of delayed neutrons from J-PARC spallation neutron source

Harada, Masahide; Teshigawara, Makoto; Oi, Motoki; Yamaguchi, Yuji; Oikawa, Kenichi; Tsuchikawa, Yusuke; Haga, Katsuhiro

no journal, , 

At J-PARC 1MW spallation neutron source, pulsed neutrons included by 25Hz pulsed proton beam are provided to neutron instruments. Recently, 800 kW proton beam operation is successful, and the proton beam power gradually increases. A neutron instrument observed neutron beams with weak time correction to proton pulse. Therefore, at the neutron instrument to measure neutron pulse characteristics, NOBORU, we tried to measure delayed neutrons. In the measurement, a neutron detector was located on the beam axis in the NOBORU experimental room and pulsed neutrons were measured with flight time after the beam operation stop. Pulse height was also measured to distinguish whether neutron or others. From the results, neutrons could be measured after the beam operation stop. We will present in details in the conference.

Measurements of double-differential cross sections of the Al(p,xp) reaction for 400 MeV - 3 GeV protons, 2; Test experiment using 400 MeV protons

Meigo, Shinichiro; Yamaguchi, Yuji; Iwamoto, Hiroki

no journal, , 

no abstracts in English

Measurements of double-differential cross sections of the Al(p,xp) reaction for 400 MeV - 3 GeV protons, 3; Derivation of double differential cross section for 400 MeV protons

Meigo, Shinichiro; Yamaguchi, Yuji; Iwamoto, Hiroki

no journal, , 

no abstracts in English

Development of boron-containing Al-based thermal neutron absorber for MW class neutron source

Okutomi, Toshifumi*; Teshigawara, Makoto; Harada, Masahide; Oi, Motoki; Yamaguchi, Yuji; Kuramoto, Shigeru*

no journal, , 

Silver/gold-indium-cadmium (Ag/Au-In-Cd) alloys as thermal neutron absorbers, which can realize high neutron cut-off energy by combining materials with neutron resonance absorption, have been used at the high-intense spallation neutron source in J-PARC. Recently, it has become difficult to treat materials including Cd. We again focused on boron (B) having the 1/v absorption and expecting a high neutron cut-off energy as a new thermal neutron absorber. As helium (He) produced by the B(n,) Li reaction causes embrittlement of material including B, it was considered that the use of B was difficult at the high-intense spallation neutron source. Therefore, we have proposed the concept called pre-decoupling, in which other thermal neutron absorber without the He production such as gadolinium (Gd) is combined with B in order to suppress the neutron absorption of B resulting reducing embrittlement. Based on the pre-decoupling concept, we have developed a material dispersing boron carbide (BC) and gadolinium oxide (GdO) in aluminum (Al) as a base material. In this presentation, we will report tensile test results of the dispersing materials powder-sintered and the vision of the development.

Life cycle of the proton beam window in J-PARC MLF

Oi, Motoki; Yamaguchi, Yuji; Kinoshita, Hidetaka; Meigo, Shinichiro; Haga, Katsuhiro

no journal, , 

Material and Life science experimental facility (MLF) in J-PARC is a spallation neutron source which uses 3 GeV proton beam with 1 MW power. The neutron production target is made with mercury and the target vessel is installed in the helium vessel. On the other hands, proton beam transport line is kept in high vacuum, less than 10 Pa to reduce the beam loss. As a boundary of the helium atmosphere and the vacuum region, proton beam window (PBW) is installed. The proton beam window is made with aluminum alloy. Due to the radiation damage of the window, lifetime of the PBW is estimated 10000 MWh. In this summer maintenance period, we replace from the PBW No. 4 to PBW No. 5. In this presentation, we report about life cycle, the structure and replacement work of the PBW.