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Yasuda, Satoshi; Di
o, W. A.*; Fukutani, Katsuyuki
Vacuum and Surface Science, 66(9), p.514 - 519, 2023/09
Monolayer graphene, representative of atomically thin crystals, has recently shown unexpectedly high proton and deuteron permeability under ambient conditions. It also permeates (filters) hydrogen (deuterium) isotope ion with high selectivity. These results suggest possible ways of developing novel and efficient hydrogen isotope gas enrichment techniques for manufacturing silicon semiconductors, optical fibers, drug development, nuclear fusion, and other related applications. And yet, despite its importance, experimental studies remain scarce and the separation mechanism contentious. Here, we introduce our recent findings on how quantum tunneling of hydrons through graphene could account for the high hydron selectivity of graphene.
Takamura, Hiroaki*; Hamada, Hajime*; Sato, Toshinori
Dai-48-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koenshu (Internet), p.13 - 18, 2022/01
In the stage blasting of a mountain tunnel, the condition of single hole initiation in which the effect of other stage does not enter was made by increasing the interval of initiation time between front and rear stages using an electron detonator, and the waveform of vibration and sound pressure at that time was measured. The knowledge obtained from the analysis of sound pressure waveform of single hole blasting is considered to be effective to be utilized for the examination of sound pressure reduction effect of controlled blasting and the analysis of error of noise prediction formula.
Hasegawa, Noboru
Kagaku, 71(3), p.72 - 73, 2016/02
In Japan, the deterioration of the infrastructure built in the high economic growth period (1954-1979) becomes big social problem. We have developed the inspection method of the defect in the concrete by using the laser technologies. We have succeeded to demonstrate the high-speed inspection of a mock-defect in concrete by using the high repetition rate impact laser and laser vibrograph. The repetition rate of inspection was improved to be 25 Hz. We commented about this measurement technique.
; Toward superconducting tunnel junctions and superconducting radiation detectors using thermal relaxation processIshida, Takekazu*; Wang, Z.*; Yotsuya, Tsutomu*; Machida, Masahiko
Kotai Butsuri, 40(1), p.51 - 67, 2005/01
no abstracts in English
Yamakawa, Koichi; Akahane, Yutaka; Fukuda, Yuji; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki; Utsumi, Takayuki*
Physical Review Letters, 92(12), p.123001_1 - 123001_4, 2004/03
Times Cited Count：68 Percentile：87.93(Physics, Multidisciplinary)We report on detailed investigations of ionization dynamics of a Xe atom exposed to intense 800-nm pulses of 20-fs duration in the extensive intensity range from 10
to 10
W/cm
. Ion yields of Xe
to Xe
were observed as a function of laser intensity and compared with the results from a single active electron based Ammosov-Delone-Krainov model. Unexpected ionization probabilities for lower charge states and also no interplay between the inner- and outer-shells by screening are inferred. Suppression of nonsequential ionization towards higher intensity and few optical cycle regimes is also proved.
Yamakawa, Koichi
Oyo Butsuri, 73(2), p.186 - 193, 2004/02
no abstracts in English
Yamakawa, Koichi; Akahane, Yutaka; Fukuda, Yuji; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki; Utsumi, Takayuki*
JAERI-Research 2003-030, 14 Pages, 2003/12
JAERI-Research-2003-030.pdf:0.75MB
We report on detailed investigations of ionization dynamics of a xenon atom exposed to intense 800-nm pulses of 20-fs duration in the extensiveintensity range from 10 to 10W/cm.Ion yields of Xe to Xe were observed as a function of laser intensity and compared with the results from a single active electron(SAE) based Ammosov-Delone-Krainov(ADK) model.Unexpected ionization probabilities for lower charge states and also no interplay between the inner-and outer-shells by screening are inferred.Suppression of nonsequential ionization towards higher intensity and few optical cycle regimesis also proved.
W/cmYamakawa, Koichi; Akahane, Yutaka; Fukuda, Yuji; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki
Physical Review A, 68(6), p.065403_1 - 065403_4, 2003/12
Times Cited Count：46 Percentile：84.49(Optics)no abstracts in English
Kumada, Takayuki
Physical Review B, 68(5), p.052301_1 - 052301_4, 2003/08
Times Cited Count：39 Percentile：81.49(Materials Science, Multidisciplinary)Effect of pressure on the recombination of H atoms produced by UV-photolysis of O
-doped solid H was studied using ESR spectroscopy. The recombination rate constant was independent of pressure up to 13 MPa below 4.2 K, whereas it remarkably decreases with the increase in pressure above. The absence of pressure effect indicates that the H atoms do not diffuse by the physical exchange of positions with neighboring H molecules, but by the tunneling reaction H + H 
H + H.
Aratono, Yasuyuki
Hamon, 13(3), p.168 - 172, 2003/07
Recent works on hydrogen abstractions by tritium atom and on recombination reactions of tritium and hydrogen atoms at low temperature(1-2K), which were carried out at JRR-3M by the authors, were introduced.
Pu(
) reaction via the superdeformed 
-vibrational resonanceNishio, Katsuhisa; Ikezoe, Hiroshi; Nagame, Yuichiro; Mitsuoka, Shinichi; Nishinaka, Ichiro; Duan, L.*; Sato, Kenichiro; Goto, Shinichi*; Asai, Masato; Haba, Hiromitsu; et al.
Physical Review C, 67(1), p.014604_1 - 014604_5, 2003/01
Times Cited Count：9 Percentile：52.79(Physics, Nuclear)no abstracts in English
isomeric decaysShizuma, Toshiyuki; Shimizu, Yoshifumi*; Hayakawa, Takehito
Journal of Nuclear Science and Technology, 39(11), p.1137 - 1141, 2002/11
Times Cited Count：4 Percentile：29.25(Nuclear Science & Technology)We have systematically investigated the highly -forbidden transitions observed in the Hf, W and Os region, using the 
-tunneling model in which low- and high- states interact through a process of the quantum tunneling. In the present study, we have analyzed -forbidden transitions recently observed. The measured hindrance factors are compared with the values calculated using the -tunneling model. We have also investigated isotope dependences of tunneling probabilities particularly for neutron-rich nuclei.
Katagiri, Masaki; Nakamura, Tatsuya; Okubo, Masataka*; Pressler, H.*; Takahashi, Hiroyuki*; Nakazawa, Masaharu*
AIP Conference Proceedings 605, p.177 - 180, 2002/00
no abstracts in English
Yamakawa, Koichi; Akahane, Yutaka; Aoyama, Makoto; Fukuda, Yuji; Inoue, Norihiro*; Ma, J.; Ueda, Hideki
AIP Conference Proceedings 611, p.385 - 396, 2002/00
no abstracts in English
Sakamoto, Shinichi; Meigo, Shinichiro; Konno, Chikara; Harada, Masahide; Miyake, Yasuhiro*; Kasugai, Yoshimi; Muto, Suguru*; Fujimori, Satoru*; Ono, Takehiro; Ikeda, Yujiro
JAERI-Tech 2001-075, 168 Pages, 2001/12
JAERI-Tech-2001-075.pdf:12.78MB
no abstracts in English
Cu
O
single crystalMurakami, Hironaru*; Asaoka, Hidehito; Sakai, Kazuo*; Ito, Toshimichi*; Tonouchi, Masayoshi*
Applied Surface Science, 175-176, p.306 - 311, 2001/05
Times Cited Count：7 Percentile：41.38(Chemistry, Physical)no abstracts in English
Hojo, Kiichi; Okayasu, Satoru; Sasase, Masato; Ishida, Takekazu*
JAERI-Review 2001-008, 150 Pages, 2001/03
JAERI-Review-2001-008.pdf:20.63MB
no abstracts in English
Shoyama, Hiroaki; Sakamoto, Keishi; Hayashi, Kenichi*; Kasugai, Atsushi; Takahashi, Koji; Tsuneoka, Masaki; Ikeda, Yukiharu; Kariya, Tsuyoshi*; Mitsunaka, Yoshika*; Imai, Tsuyoshi
Shingaku Giho, 100(506), p.39 - 44, 2000/12
no abstracts in English
+CHH+CH reaction and its isotopic variantsKurosaki, Yuzuru; Takayanagi, Toshiyuki
Journal of Chemical Physics, 113(10), p.4060 - 4072, 2000/09
Times Cited Count：22 Percentile：55.85(Chemistry, Physical)no abstracts in English
