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Journal Articles

Photoneutron detection in lightning by gadolinium orthosilicate scintillators

Wada, Yuki*; Nakazawa, Kazuhiro*; Enoto, Teruaki*; Furuta, Yoshihiro; Yuasa, Takayuki*; Makishima, Kazuo*; Tsuchiya, Harufumi

Physical Review D, 101(10), p.102007_1 - 102007_6, 2020/05

 Times Cited Count:0 Percentile:100(Astronomy & Astrophysics)

Journal Articles

Neutron emission spectrum from gold excited with 16.6 MeV linearly polarized monoenergetic photons

Kirihara, Yoichi; Nakashima, Hiroshi; Sanami, Toshiya*; Namito, Yoshihito*; Itoga, Toshiro*; Miyamoto, Shuji*; Takemoto, Akinori*; Yamaguchi, Masashi*; Asano, Yoshihiro*

Journal of Nuclear Science and Technology, 57(4), p.444 - 456, 2020/04

 Times Cited Count:0 Percentile:100(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Downward terrestrial gamma-ray flash observed in a winter thunderstorm

Wada, Yuki*; Enoto, Teruaki*; Nakazawa, Kazuhiro*; Furuta, Yoshihiro; Yuasa, Takayuki*; Nakamura, Yoshitaka*; Morimoto, Takeshi*; Matsumoto, Takahiro*; Makishima, Kazuo*; Tsuchiya, Harufumi

Physical Review Letters, 123(6), p.061103_1 - 061103_6, 2019/08

 Times Cited Count:3 Percentile:25.77(Physics, Multidisciplinary)

Journal Articles

Photonuclear reactions triggered by lightning discharge

Enoto, Teruaki*; Wada, Yuki*; Furuta, Yoshihiro*; Nakazawa, Kazuhiro*; Yuasa, Takayuki*; Okuda, Kazufumi*; Makishima, Kazuo*; Sato, Mitsuteru*; Sato, Yosuke*; Nakano, Toshio*; et al.

Nature, 551(7681), p.481 - 484, 2017/11

 Times Cited Count:47 Percentile:2.82(Multidisciplinary Sciences)

Journal Articles

Journal Articles

Evidence for p-process nucleosynthesis recorded at the solar system abundances

Hayakawa, Takehito; Iwamoto, Nobuyuki; Shizuma, Toshiyuki; Kajino, Toshitaka*; Umeda, Hideyuki*; Nomoto, Kenichi*

European Physical Journal A, 27(S1), p.123 - 128, 2006/03

 Times Cited Count:0 Percentile:100(Physics, Nuclear)

no abstracts in English

Journal Articles

Photodisintegration cross section measurements on $$^{186}$$W, $$^{187}$$Re and $$^{188}$$Os; Implications for the Re-Os cosmochronology

Shizuma, Toshiyuki; Utsunomiya, Hiroaki*; Mohr, P.*; Hayakawa, Takehito; Goko, Shinji*; Makinaga, Ayano*; Akimune, Hidetoshi*; Yamagata, Tamio*; Ota, Masahisa*; Ogaki, Hideaki*; et al.

Physical Review C, 72(2), p.025808_1 - 025808_9, 2005/08

 Times Cited Count:36 Percentile:10.74(Physics, Nuclear)

Cross sections of the $$^{186}$$W, $$^{187}$$Re, $$^{188}$$Os($$gamma,n$$) reactions were measured using quasi-monochromatic photon beams from laser Compton scattering (LCS) with average energies from 7.3 to 10.9 MeV. The results are compared with the predictions of Hauser-Feshbach statistical calculations using four different sets of input parameters. In addition, the inverse neutron capture cross sections were evaluated by constraining the model parameters, especially the $$E1$$ strength function, on the basis of the experimental data. The present experiment helps to further constrain the correction factor $$F_{sigma}$$ for the neutron capture on the 9.75 keV state in $$^{187}$$Os. Implications of $$F_{sigma}$$ to the Re-Os cosmochronology are discussed with a focus on the uncertainty in the estimate of the age of the Galaxy.

Journal Articles

Photoneutron cross section measurements on $$^{186}$$W, $$^{187}$$Re and $$^{188}$$Os for cosmochronology

Shizuma, Toshiyuki; Utsunomiya, Hiroaki*; Goko, Shinji*; Mohr, P.*; Hayakawa, Takehito; Makinaga, Ayano*; Hara, Kaoru*; Ogaki, Hideaki*; Lui, Y.-W.*; Goriely, S.*

Nuclear Physics A, 758, p.561c - 564c, 2005/07

Photodisintegration experiments were carried out for $$^{186}$$W, $$^{187}$$Re, and $$^{188}$$Os using quasi-monochromatic $$gamma$$-ray beams from laser Compton scattering (LCS) at the National Institute of Advanced Industrial Science and Technology. The excitation function of ($$gamma$$,n) cross sections was measured for the three nuclei near neutron thresholds, taking advantage of the intense peaking of the energy-tunable LCS beam in the energy region of astrophysical importance. Neutron capture cross sections for $$^{185}$$W, $$^{186}$$Re, and $$^{187}$$Os are evaluated from the photodisintegration data with the Hauser-Feshbach statistical model. We quantitatively discuss the two corrections factors for the s-process branchings and the neutron capture on the 9.75 keV state.

Journal Articles

Scaling relations for the supernova $$gamma$$-process and the $$^{176}$$Lu nuclear cosmochronometer

Hayakawa, Takehito; Iwamoto, Nobuyuki; Shizuma, Toshiyuki; Kajino, Toshitaka*; Umeda, Hideyuki*; Nomoto, Kenichi*

Nuclear Physics A, 758, p.525c - 528c, 2005/07

no abstracts in English

Journal Articles

A Conceptual design study for active nondestructive assay technique by photon interrogation for uranium-bearing waste

Sakurai, Takeshi; Kosako, Kazuaki*; Mori, Takamasa

Monte Karuro Keisanho Kodoka No Genjo; Dai-3-Kai Monte Karuro Shimyureshon Kenkyukai Hobunshu, p.168 - 176, 2004/12

no abstracts in English

Journal Articles

Evidence for nucleosynthesis in the supernova $$gamma$$ process; Universal scaling for $$p$$-nuclei

Hayakawa, Takehito; Iwamoto, Nobuyuki; Shizuma, Toshiyuki; Kajino, Toshitaka*; Umeda, Hideyuki*; Nomoto, Kenichi*

Physical Review Letters, 93(16), p.161102_1 - 161102_4, 2004/10

 Times Cited Count:50 Percentile:14.41(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

$$s$$-process branching at $$^{185}$$W revised

Mohr, P.*; Shizuma, Toshiyuki; Ueda, Hiroyasu*; Goko, Shinji*; Makinaga, Ayano*; Hara, Kaoru*; Hayakawa, Takehito; Lui, Y.-W.*; Ogaki, Hideaki*; Utsunomiya, Hiroaki*

Physical Review C, 69(3), p.032801_1 - 032801_4, 2004/03

 Times Cited Count:30 Percentile:16.27(Physics, Nuclear)

The neutron capture cross section of the unstable s-process branching nucleus $$^{185}$$W has been derived from experimental data of the inverse $$^{186}$$W($$gamma$$,n)$$^{185}$$W photodisintegration taken with monochromatic photon beams from laser Compton scattering. The result of $$sigma = 553 pm 60$$mb at $$kT = 30$$keV leads to a relatively high effective neutron density in the classical s process of $$N_{rm{n}} = 4.7 times 10^8,{rm{cm}}^{-3}$$. A realistic model for the s process in thermally pulsing AGB stars overestimates the abundance of $$^{186}$$Os significantly because of the relatively small neutron capture cross section of $$^{185}$$W.

Journal Articles

Fundamental physics with an X-ray free electron laser

Tajima, Toshiki

Plasma Physics Reports, 29(3), p.231 - 235, 2003/03

 Times Cited Count:5 Percentile:81.55(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Coherent $$phi$$ and $$omega$$ photoproduction from deuteron and non-diffractive channels

Titov, A. I.; Fujiwara, Mamoru; Lee, T.-S. H.*

Physical Review C, 66(2), p.022202_1 - 022202_5, 2002/08

 Times Cited Count:12 Percentile:41.2(Physics, Nuclear)

no abstracts in English

JAEA Reports

None

*

JNC-TN1400 2001-011, 129 Pages, 2001/07

JNC-TN1400-2001-011.pdf:7.51MB

no abstracts in English

JAEA Reports

A Study on radiation shielding and safety analysis for synchrotron radiation beamline

Asano, Yoshihiro

JAERI-Research 2001-006, 162 Pages, 2001/03

JAERI-Research-2001-006.pdf:6.05MB

no abstracts in English

Journal Articles

Fluence to effective dose conversion coefficients for electrons from 1MeV to 100GeV

Tsuda, Shuichi; Endo, Akira; Yamaguchi, Yasuhiro; Sato, Osamu*

KEK Proceedings 2000-20, p.40 - 47, 2000/12

no abstracts in English

JAEA Reports

A study on improvements in accuracy of nuclear data measurements using $$gamma$$-ray spectroscopic methods

Furutaka, Kazuyoshi

JNC-TN8400 2000-028, 70 Pages, 2000/10

JNC-TN8400-2000-028.pdf:1.71MB

This report describes the study done by the author as a postdoctoral research associate at Japan Nuclear Cycle Development Institute. This report is divided into two parts: improvements in accuracy in determination of thermal neutron capture cross sections, and improvements in accuracy of photo-nuclear absorption cross section measurements using the HHS. (1)In the measurements of thermal neutron capture cross sections using an activation method, accuracies of the final results attained are limited by (1) accuracy of $$gamma$$-ray peak detection efficiencies, and (2) accuracies of $$gamma$$-ray emission probabilities. In this study; to determine thermal neutron capture cross sections more accurately, the following researches have been done using a newly developed three-dimensional coincidence measurement system: (1)accurate determination of $$gamma$$-ray standard sources using a $$gamma$$-$$gamma$$ coincidence method, for precise calibration of $$gamma$$-ray peak detection efficiency, and (2) development of a $$beta$$-$$gamma$$ coincidence measurement system using a plastic scintillation detector as a $$beta$$-ray detector, for the determination of $$gamma$$-ray emission probabilities of short-lived nuclides, and measurement of $$gamma$$-ray emission probabilities of $$^{100}$$Tc nuclide using the coincidence system. (2)To transform radioactive nuclides with small thermal neutron capture cross sections, use of photonuclear absorption reaction has been suggested. In order to transform these nuclides efficiently using the reaction, one has to know detailed behavior of the photo-absorption cross sections. In this study, a Monte-Carlo simulation code has been used to create a standard set of $$gamma$$-ray response functions of the high-resolution high-energy spectrometer (HHS), to enable reliable analyses of the data obtained by the spectrometer.

JAEA Reports

None

*

JNC-TN1400 2000-006, 68 Pages, 2000/07

JNC-TN1400-2000-006.pdf:2.18MB

no abstracts in English

JAEA Reports

None

*

JNC-TN1400 2000-004, 0 Pages, 2000/07

JNC-TN1400-2000-004.pdf:4.27MB

None

30 (Records 1-20 displayed on this page)