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knockout reaction as a new probe for formation in -decay nucleiYoshida, Kazuki; Tanaka, Junki*
Physical Review C, 106(1), p.014621_1 - 014621_6, 2022/07
Times Cited Count：5 Percentile：76.34(Physics, Nuclear)Alternative to the decay lifetime measurement, we propose the proton-induced knockout reaction, (
,
), as a new probe for the surface formation probability of decay nuclei. 
Po(,)
Pb reaction is described by the distorted-wave impulse approximation framework. It is shown that the 
Po/
Po ratio of the knockout cross sections agree with that of the surface formation probabilities determined by the lifetime measurements. The result implies that the (,) cross section is a direct probe for the surface formation probability, which is an essential quantity to lead us to a complete understanding of the decay phenomena.
Kataoka, Takahiro*; Shuto, Hina*; Naoe, Shota*; Yano, Junki*; Kanzaki, Norie; Sakoda, Akihiro; Tanaka, Hiroshi; Hanamoto, Katsumi*; Mitsunobu, Fumihiro*; Terato, Hiroaki*; et al.
Journal of Radiation Research (Internet), 62(5), p.861 - 867, 2021/09
Times Cited Count：5 Percentile：55.27(Biology)Kataoka, Takahiro*; Kanzaki, Norie; Sakoda, Akihiro; Shuto, Hina*; Yano, Junki*; Naoe, Shota*; Tanaka, Hiroshi; Hanamoto, Katsumi*; Terato, Hiroaki*; Mitsunobu, Fumihiro*; et al.
Journal of Radiation Research (Internet), 62(2), p.206 - 216, 2021/03
Times Cited Count：6 Percentile：61.83(Biology)Radon inhalation activates antioxidative functions in mouse organs, thereby contributing to inhibition of oxidative stress-induced damage. Therefore, in this study, we evaluated the redox state of various organs in mice following radon inhalation. Mice inhaled radon at concentrations of 2 or 20 kBq/m
for 1, 3, or 10 days. The relationship between antioxidative function and oxidative stress was evaluated by principal component analysis (PCA) and correlation coefficient compared with control mice subjected to sham inhalation. These findings suggested that radon inhalation altered the redox state in organs, but that the characteristics varied depending on the redox state in organs.
clusters in dilute neutron-rich matterTanaka, Junki*; Yang, Z.*; Typel, S.*; Adachi, Satoshi*; Bai, S.*; van Beek, P.*; Beaumel, D.*; Fujikawa, Yuki*; Han, J.*; Heil, S.*; et al.
Science, 371(6526), p.260 - 264, 2021/01
Times Cited Count：48 Percentile：99.12(Multidisciplinary Sciences)By employing quasi-free -cluster-knockout reactions, we obtained direct experimental evidence for the formation of clusters at the surface of neutron-rich tin isotopes. The observed monotonous decrease of the reaction cross sections with increasing mass number, in excellent agreement with the theoretical prediction, implies a tight interplay between -cluster formation and the neutron skin.
collisions at 
= 200 and 62.4 GeVAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Armendariz, R.*; et al.
Physical Review C, 83(6), p.064903_1 - 064903_29, 2011/06
Times Cited Count：184 Percentile：99.44(Physics, Nuclear)Transverse momentum distributions and yields for 
, and 
in collisions at = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the RHIC. We present the inverse slope parameter, mean transverse momentum, and yield per unit rapidity at each energy, and compare them to other measurements at different collisions. We also present the scaling properties such as 
and 
scaling and discuss the mechanism of the particle production in collisions. The measured spectra are compared to next-to-leading order perturbative QCD calculations.
and Au+Au collisions at 
= 200 GeVAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.
Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04
Times Cited Count：8 Percentile：49.7(Physics, Nuclear)Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to collisions.
-sexithiophene thin films grown on semiconductor surface studied by near-edge X-ray absorption fine structureHiraga, Kenta*; Toyoshima, Hiroaki*; Nakajima, Junki*; Tanaka, Hiroya*; Ono, Shinya*; Tanaka, Masatoshi*; Sekiguchi, Tetsuhiro; Hirao, Norie; Shimoyama, Iwao; Baba, Yuji
no journal, ,
It is important to investigate structure of organic thin films grown on semiconductor surfaces for fabrication of the organic semiconductors.
Kataoka, Takahiro*; Kanzaki, Norie; Sakoda, Akihiro; Ishida, Tsuyoshi; Shuto, Hina*; Yano, Junki*; Tanaka, Hiroshi; Hanamoto, Katsumi*; Terato, Hiroaki*; Mitsunobu, Fumihiro*; et al.
no journal, ,
We have reported that radon inhalation activates antioxidative functions in mouse organs. These activation inhibits reactive oxygen species (ROS) induced oxidative stresses. Activation of antioxidative functions induced by radon inhalation probably due to the production of a small quantity of ROS. However, there were no reports on this mechanism. In this study, we evaluated hydrogen peroxide induced oxidative stress by radon inhalation in mouse organs. That is, mice inhaled radon at a concentration of 1 kBq/m or 10 kBq/m for 24 hours. Results showed that radon inhalation increased hydrogen peroxide in liver and lung by 20%. On the other hand, hydrogen peroxide in heart decreased by 20%. This is probably due to total glutathione reacts with hydrogen peroxide. These findings suggest that radon inhalation produces a small quantity of hydrogen peroxide, which is ROS, in mouse organs. However, antioxidative related substances, which are catalase and total glutathione, play an important role to reduce oxidative stress.
Kataoka, Takahiro*; Kanzaki, Norie; Sakoda, Akihiro; Ishida, Tsuyoshi; Shuto, Hina*; Yano, Junki*; Tanaka, Hiroshi; Hanamoto, Katsumi*; Terato, Hiroaki*; Mitsunobu, Fumihiro*; et al.
no journal, ,
no abstracts in English
Kataoka, Takahiro*; Kanzaki, Norie; Sakoda, Akihiro; Shuto, Hina*; Yano, Junki*; Ishida, Tsuyoshi*; Tanaka, Hiroshi; Hanamoto, Katsumi*; Terato, Hiroaki*; Mitsunobu, Fumihiro*; et al.
no journal, ,
no abstracts in English
Kataoka, Takahiro*; Kanzaki, Norie; Sakoda, Akihiro; Shuto, Hina*; Yano, Junki*; Naoe, Shota*; Tanaka, Hiroshi; Hanamoto, Katsumi*; Terato, Hiroaki*; Mitsunobu, Fumihiro*; et al.
no journal, ,
no abstracts in English
Masukawa, Yuki*; Kataoka, Takahiro*; Shuto, Hina*; Naoe, Shota*; Yano, Junki*; Kanzaki, Norie; Sakoda, Akihiro; Tanaka, Hiroshi; Hanamoto, Katsumi*; Mitsunobu, Fumihiro*; et al.
no journal, ,
no abstracts in English
Nishi, Soyoka*; Kataoka, Takahiro*; Ishida, Tsuyoshi*; Naoe, Shota*; Shuto, Hina*; Yano, Junki*; Kanzaki, Norie; Sakoda, Akihiro; Tanaka, Hiroshi; Mitsunobu, Fumihiro*; et al.
no journal, ,
no abstracts in English
Yoshida, Kazuki; Tanaka, Junki*
no journal, ,
Considering the doubly magic nature of 
Pb nucleus, a large difference of the formation probability on the surface of Po and Po nuclei is expected. It is already confirmed that there exists a large gap in the decay lifetime of these nuclei. In this presentation, we theoretically describe the knockout reaction from these nuclei and consider the possibility of extracting the formation probability from the knockout cross section. A unique asymmetry of the momentum distribution which appears in the knockout reaction from heavy nuclei is also reported.
Po/Po ratio of the alpha reduced determined by alpha knockout reactionYoshida, Kazuki; Tanaka, Junki*
no journal, ,
We analyzed various types of cross sections of the Po(,)Pb reaction, such as the triple differential cross section, longitudinal momentum distribution, and the total knockout cross section. It is confirmed that by the proton-induced knockout reaction, it is possible to extract the reduced width of the decay nuclei. This is because of the surface sensitivity of the reaction, not the amplitude in the whole region but only the surface amplitude contributes to the knockout cross sections. This feature allows us to probe the reduced width, namely, the formation probability on the surface of the decay nuclei.
