Precise lifetime measurement of H hypernucleus using in-flight HeH reaction

Akaishi, Takaya; Hashimoto, Tadashi; Tanida, Kiyoshi; 35 of others*

Physics Letters B, 845, p.138128_1 - 138128_4, 2023/10

https://doi.org/10.1016/j.physletb.2023.138128

The Japan Health Physics Society Guideline on Dose Monitoring for the Lens of the Eye

Yokoyama, Sumi*; Tsujimura, Norio; Hashimoto, Makoto; Yoshitomi, Hiroshi; Kato, Masahiro*; Kurosawa, Tadahiro*; Tatsuzaki, Hideo*; Sekiguchi, Hiroshi*; Koguchi, Yasuhiro*; Ono, Koji*; et al.

Journal of Radiation Protection and Research, 47(1), p.1 - 7, 2022/03

https://doi.org/10.14407/jrpr.2021.00276

Background: In Japan, new regulations that revise the dose limit for the lens of the eye (the lens), operational quantities, and measurement positions for the lens dose were enforced in April 2021. Based on the international safety standards, national guidelines, the results of the Radiation Safety Research Promotion Fund of the Nuclear Regulatory Authority, and other studies, the Working Group of Radiation Protection Standardization Committee, the Japan Health Physics Society (JHPS) developed a guideline for radiation dose monitoring for the lens. Materials and Methods: The Working Group of the JHPS discussed the criteria of non-uniform exposure and the management criteria set to not exceed the dose limit for the lens. Results and Discussion: In July 2020, the JHPS guideline was published. The guideline consists of three parts: main text, explanations, and 26 questions. In the questions, the corresponding answers were prepared, and specific examples were provided to enable similar cases to be addressed. Conclusion: With the development of guideline on radiation dose monitoring of the lens, radiation managers and workers will be able to smoothly comply with revised regulations and optimise radiation protection.

Development of guidelines on radiation protection for the lens of the eye in Japan

Yokoyama, Sumi*; Iwai, Satoshi*; Tsujimura, Norio; Hashimoto, Makoto; Yoshitomi, Hiroshi; Kato, Masahiro*; Kurosawa, Tadahiro*; Tatsuzaki, Hideo*; Sekiguchi, Hiroshi*; Koguchi, Yasuhiro*; et al.

Proceedings of 15th International Congress of the International Radiation Protection Association (IRPA-15) (Internet), 8 Pages, 2022/00

https://irpa.net/irpa15/T3.1-O0124.pdf

J-PARC E07; Systematic study of double strangeness system with hybrid emulsion method

Yoshida, Junya; Akaishi, Takaya; Fujita, Manami; Hasegawa, Shoichi; Hashimoto, Tadashi; Hosomi, Kenji; Ichikawa, Masaya; Ichikawa, Yudai; Imai, Kenichi*; Kim, S.; et al.

JPS Conference Proceedings (Internet), 33, p.011112_1 - 011112_8, 2021/03

https://doi.org/10.7566/JPSCP.33.011112

Observation of a bound state in the He reaction

Yamaga, Takumi*; Hashimoto, Tadashi; Tanida, Kiyoshi; 66 of others*

Physical Review C, 102(4), p.044002_1 - 044002_14, 2020/10

https://doi.org/10.1103/PhysRevC.102.044002

-nuclear bound state at J-PARC

Sakuma, Fuminori*; Hashimoto, Tadashi; Tanida, Kiyoshi; 66 of others*

JPS Conference Proceedings (Internet), 32, p.010088_1 - 010088_8, 2020/07

https://doi.org/10.7566/JPSCP.32.010088

spectroscopy via the in-flight reaction at the J-PARC K1.8BR

Kawasaki, Shingo*; Hashimoto, Tadashi; Tanida, Kiyoshi; 72 of others*

JPS Conference Proceedings (Internet), 26, p.022009_1 - 022009_5, 2019/11

https://doi.org/10.7566/JPSCP.26.022009

"", a -meson nuclear bound state, observed in He( reactions

Hashimoto, Tadashi; Tanida, Kiyoshi; 67 of others*

Physics Letters B, 789, p.620 - 625, 2019/02

https://doi.org/10.1016/j.physletb.2018.12.058

We observed a distinct peak in the invariant mass spectrum of , well below , , the mass threshold of the to be bound to two protons. By selecting a relatively large momentum-transfer region MeV/, one can clearly separate the peak from the quasi-free process, followed by the non-resonant absorption by the non-resonant absorption by the two spectator-nucleons . We found that the simplest fit to the observed peak gives us a Breit-Wignerpole position at MeV having a width MeV, and the -wave Gaussian reaction form-factor parameter MeV/, as a new form of the nuclear bound system with strangeness -"".

Kaonic-atom X-ray spectroscopy with superconducting microcalorimeters

Hashimoto, Tadashi; Tanida, Kiyoshi; 45 of others*

JPS Conference Proceedings (Internet), 17, p.072001_1 - 072001_4, 2017/07

https://doi.org/10.7566/JPSCP.17.072001

Beamline test of a transition-edge-sensor spectrometer in preparation for kaonic-atom measurements

Hashimoto, Tadashi*; Tanida, Kiyoshi; 49 of others*

IEEE Transactions on Applied Superconductivity, 27(4), p.2100905_1 - 2100905_5, 2017/06

https://doi.org/10.1109/TASC.2016.2646374