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Journal Articles

Degassing behavior of noble gases from groundwater during groundwater sampling

Nakata, Kotaro*; Hasegawa, Takuma*; Solomon, D. K.*; Miyakawa, Kazuya; Tomioka, Yuichi*; Ota, Tomoko*; Matsumoto, Takuya*; Hama, Katsuhiro; Iwatsuki, Teruki; Ono, Masahiko*; et al.

Applied Geochemistry, 104, p.60 - 70, 2019/05

 Times Cited Count:0 Percentile:100(Geochemistry & Geophysics)

no abstracts in English

Journal Articles

Noble gas monitoring at the Takasaki radionuclide station of JAEA; Certification by the Comprehensive Nuclear-Test-Ban Treaty (CTBT) Organization

Yamamoto, Yoichi

Isotope News, (736), p.31 - 33, 2015/08

The Takasaki radionuclide (RN) station for the Comprehensive Nuclear-Test-Ban Treaty (CTBT) has been in operation for monitoring of radioactive noble gases (radioxenon) by the Japan Atomic Energy Agency (JAEA) since 2007, first as a test run prior to receiving the certification. The noble gas system in the station was certified by the CTBT Organization (CTBTO) on December 19, 2014. Monitoring of radioxenon is expected to have a particularly valuable role in detection of an underground nuclear test. The Takasaki RN station detected radioxenon isotopes simultaneously with radioactive concentration exceeding normal background range in April, 2013. This abnormal event was identified as being associated with the nuclear test declared by North Korea in February, 2013. Since the Takasaki RN station is located at the east end of Asia, it is receiving widespread international attention as the station for radionuclides dispersed by the westerlies.

Journal Articles

Vibrational dissipation and dephasing of I$$_{2}$$(v = 1-19) in solid Kr

Karavitis, M.*; Kumada, Takayuki; Goldschleger, I. U.*; Apkarian, V. A.*

Physical Chemistry Chemical Physics, 7(5), p.791 - 796, 2005/02

 Times Cited Count:28 Percentile:29.36(Chemistry, Physical)

Energy dissipation and phase relaxation of the vibrational quantum states of iodine molecules in solid krypton have been studied in the temperature range between 7 and 45 K using a technique of time-resolved coherent anti-stokes Raman scattering (CARS) spectroscopy by a femto-second laser. The rate of energy dissipation was independent of tempeature, but proportional to the vibrational quantum number v. The pure dephasing rate exponentially increased with an increase in temperature and was proportional to v$$^{2}$$. The energy relaxation was found to take place by transfering the vibrational energy of iodine to four phonons in the krypton solid. The pure dephasing was induced by elastic scattering with phonon. It was suggested by a computer simulation that the phonon which induced the pure dephasing accompanied libration mode of iodine molecules.

Journal Articles

Many-electron dynamics of a Xe atom in strong and superstrong laser fields

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:62 Percentile:11.69(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$$^{13}$$ to 10$$^{18}$$ W/cm$$^{2}$$. Ion yields of Xe$$^{+}$$ to Xe$$^{20+}$$ 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.

JAEA Reports

Ionization dynamics of a xenon atom in super-strong laser fields

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$$^{13}$$ to 10$$^{18}$$W/cm$$^{2}$$.Ion yields of Xe$$^{+}$$ to Xe$$^{20+}$$ 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.

Journal Articles

Ionization of many-electron atoms by ultrafast laser pulses with peak intensities greater than 10$$^{19}$$ W/cm$$^{2}$$

Yamakawa, 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:35 Percentile:20.46(Optics)

no abstracts in English

Journal Articles

Super strong field ionization of atoms by 10$$^{19}$$ Wcm$$^{-2}$$, 10 Hz laser pulses

Yamakawa, Koichi; Akahane, Yutaka; Fukuda, Yuji; Aoyama, Makoto; Ma, J.; Inoue, Norihiro*; Ueda, Hideki; Kiriyama, Hiromitsu

Journal of Modern Optics, 50(15-17), p.2515 - 2522, 2003/10

no abstracts in English

Journal Articles

In-terminal ECR ion source innstallation project, 2

Matsuda, Makoto; Fujii, Yoshio*; Takeuchi, Suehiro; Yoshida, Tadashi

Dai-15-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.62 - 64, 2003/03

no abstracts in English

Journal Articles

JAERI tandem accelerator and RNB project

Yoshida, Tadashi; Kanda, Susumu; Takeuchi, Suehiro; Horie, Katsuzo; Ouchi, Isao; Tsukihashi, Yoshihiro; Hanashima, Susumu; Abe, Shinichi; Ishizaki, Nobuhiro; Tayama, Hidekazu; et al.

Dai-15-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.51 - 53, 2003/03

no abstracts in English

Journal Articles

Radionuclide monitoring stations in CTBT verification regime

Kumata, Masahiro; Oda, Tetsuzo; Miyamoto, Yutaka; Uchikoshi, Takako*; Nakahara, Yoshinori; Yamamoto, Yoichi; Hokida, Takanori; Hirota, Naoki*; Inoue, Yoji; Shinohara, Nobuo

Dai-23-Kai Kaku Busshitsu Kanri Gakkai Nippon Shibu Nenji Taikai Rombunshu, p.39 - 44, 2002/12

The International Monitoring System (IMS) will be established across the world to verify compliance with the Comprehensive Test Ban Treaty (CTBT). The IMS will be capable of detecting and identifying nuclear explosions of detonated within the atmosphere, underwater and underground. 321 monitoring stations will be set around the world as a monitoring network of the IMS. The four technologies of seismology, hydroacoustic, infrasound, and radionuclide will be used for monitoring purposes. In order to build the radionuclide monitoring network, 80 radionuclide stations were chosen. Particles in the atmosphere are collected on a filter at each station to measure radioactivity by a HP-Ge detector. Further, 40 out of these 80 stations will be equipped with an automatic radioactive noble gas sampler/analyzer. The JAERI is establishing infrastructure to host radionuclide air monitoring equipment for two raionuclide stations in Japan. This paper presents the current status of the establishment and promising performance of the stations in Japan.

Journal Articles

Optical field ionization of rare gas atoms by $$>$$10$$^{19}$$ W/cm$$^{2}$$, 10-Hz laser pulses

Yamakawa, Koichi; Akahane, Yutaka; Fukuda, Yuji; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki

Reza Kenkyu, 30(12), p.749 - 750, 2002/12

no abstracts in English

Journal Articles

Outline of simulation code fact for analysis of ventilation system on criticality accident

Tsubata, Yasuhiro; Tashiro, Shinsuke; Koike, Tadao; Abe, Hitoshi*; Watanabe, Koji; Uchiyama, Gunzo

Transactions of the American Nuclear Society, 87, p.60 - 61, 2002/11

no abstracts in English

Journal Articles

Status report of in-terminal ECR ion source

Matsuda, Makoto; Fujii, Yoshio*; Tayama, Hidekazu; Ishizaki, Nobuhiro; Abe, Shinichi; Hanashima, Susumu; Tsukihashi, Yoshihiro; Horie, Katsuzo; Ouchi, Isao; Kanda, Susumu; et al.

JNC TN7200 2001-001, p.166 - 168, 2002/01

no abstracts in English

Journal Articles

Source term on release behavior of radioactive materials from fuel solution under simulated nuclear criticality accident

Abe, Hitoshi; Tashiro, Shinsuke; Koike, Tadao; Okagawa, Seigo; Uchiyama, Gunzo

Proceedings of the 2001 Topical Meeting on Practical Implementation of Nuclear Criticality Safety (CD-ROM), 8 Pages, 2001/11

no abstracts in English

JAEA Reports

Studies on release behavior of radioactive noble gases from fuel solution to gas phase under simulated nuclear criticality accident (Contract research)

Abe, Hitoshi; Tashiro, Shinsuke; Koike, Tadao; Okagawa, Seigo; Uchiyama, Gunzo

JAERI-Research 2001-027, 20 Pages, 2001/03

JAERI-Research-2001-027.pdf:1.0MB

no abstracts in English

JAEA Reports

A Study on rare gas-oxygen reactions excited by low temperature plasma

Ogawa, Hiroaki; Kiuchi, Kiyoshi; Saburi, Tei; Fukaya, Kiyoshi

JAERI-Research 2001-023, 21 Pages, 2001/03

JAERI-Research-2001-023.pdf:1.98MB

no abstracts in English

Journal Articles

Application of an ECRIS for the JAERI tandem accelerator

Matsuda, Makoto; Takeuchi, Suehiro; Kobayashi, Chiaki*

KEK Proceedings 99-22, p.17 - 27, 2000/01

no abstracts in English

JAEA Reports

Study on the release behavior of radioactive iodine spices and noble gases from the fuel solution under simulated nuclear criticality accident (Contract research)

Abe, Hitoshi; Tashiro, Shinsuke; Nagai, Hitoshi; Koike, Tadao; Okagawa, Seigo; Murata, Mikio

JAERI-Tech 99-067, p.23 - 0, 1999/09

JAERI-Tech-99-067.pdf:1.37MB

no abstracts in English

Journal Articles

Beam acceleration experiments from the in-terminal ECR ion source

Matsuda, Makoto; Takeuchi, Suehiro; Kobayashi, Chiaki*

Dai-12-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.113 - 116, 1999/00

no abstracts in English

Journal Articles

In-terminal ECR ion source of the tandem accelerator at JAERI

Matsuda, Makoto; Kobayashi, Chiaki*; Takeuchi, Suehiro

Proc. of 14th Int. Workshop on ECR Sources (ECRIS99), p.176 - 179, 1999/00

no abstracts in English

52 (Records 1-20 displayed on this page)