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Journal Articles

Quasifree neutron knockout reaction reveals a small $$s$$-Orbital component in the Borromean nucleus $$^{17}$$B

Yang, Z. H.*; Kubota, Yuki*; Corsi, A.*; Yoshida, Kazuki; Sun, X.-X.*; Li, J. G.*; Kimura, Masaaki*; Michel, N.*; Ogata, Kazuyuki*; Yuan, C. X.*; et al.

Physical Review Letters, 126(8), p.082501_1 - 082501_8, 2021/02

 Times Cited Count:10 Percentile:98.7(Physics, Multidisciplinary)

A quasifree ($$p$$,$$pn$$) experiment was performed to study the structure of the Borromean nucleus $$^{17}$$B, which had long been considered to have a neutron halo. By analyzing the momentum distributions and exclusive cross sections, we obtained the spectroscopic factors for $$1s_{1/2}$$ and $$0d_{5/2}$$ orbitals, and a surprisingly small percentage of 9(2)% was determined for $$1s_{1/2}$$. Our finding of such a small $$1s_{1/2}$$ component and the halo features reported in prior experiments can be explained by the deformed relativistic Hartree-Bogoliubov theory in continuum, revealing a definite but not dominant neutron halo in $$^{17}$$B. The present work gives the smallest $$s$$- or $$p$$-orbital component among known nuclei exhibiting halo features and implies that the dominant occupation of $$s$$ or $$p$$ orbitals is not a prerequisite for the occurrence of a neutron halo.

Journal Articles

Influence of discontinuous columnar defects on flux pinning properties in GdBCO coated conductors

Sueyoshi, Tetsuro*; Kotaki, Tetsuya*; Furuki, Yuichi*; Uraguchi, Yusei*; Kai, Takashi*; Fujiyoshi, Takanori*; Shimada, Yusuke*; Yasuda, Kazuhiro*; Ishikawa, Norito

IEEE Transactions on Applied Superconductivity, 25(3), p.6603004_1 - 6603004_4, 2015/06

 Times Cited Count:7 Percentile:44.18(Engineering, Electrical & Electronic)

To investigate the effect of discontinuity of 1-D pinning centers on the flux pinning in a wide range of magnetic field directions, discontinuous columnar defects (CDs) and continuous CDs were formed in GdBCO coated conductors using Xe-ion irradiations with 80 and 270 MeV, respectively. An overall shift upward in Jc, for the 80-MeV-irradiated sample compared to the 270-MeV-irradiated one, can be observed in every direction of magnetic field, which is more remarkable as temperature decreases. This implies a synergetic effect of the pinning interaction between the linearity and the discontinuity for the discontinuous CDs.

Journal Articles

Isoscalar giant resonances in the Sn nuclei and implications for the asymmetry term in the nuclear-matter incompressibility

Li, T.*; Garg, U.*; Liu, Y.*; Marks, R.*; Nayak, B. K.*; Madhusudhana Rao, P. V.*; Fujiwara, Mamoru*; Hashimoto, Hisanobu*; Nakanishi, Kosuke*; Okumura, Shun*; et al.

Physical Review C, 81(3), p.034309_1 - 034309_11, 2010/03

 Times Cited Count:92 Percentile:97.51(Physics, Nuclear)

Journal Articles

Polarization transfer in the $$^{16}$$O($$p,p'$$) reaction at forward angles and structure of the spin-dipole resonances

Kawabata, Takahiro*; Ishikawa, Takatsugu*; Ito, M.*; Nakamura, M.*; Sakaguchi, Harutaka*; Takeda, H.*; Taki, T.*; Uchida, Makoto*; Yasuda, Yusuke*; Yosoi, Masaru*; et al.

Physical Review C, 65(6), p.064316_1 - 064316_12, 2002/06

 Times Cited Count:18 Percentile:68.54(Physics, Nuclear)

no abstracts in English

Journal Articles

Giant monopole resonances in deformed nuclei

Ito, M.*; Sakaguchi, Harutaka*; Ishikawa, Takatsugu*; Kawabata, Takahiro*; Murakami, Tetsuya*; Takeda, H.*; Taki, T.*; Tsukahara, N.*; Uchida, Makoto*; Yasuda, Yusuke*; et al.

Nuclear Physics A, 687(1-2), p.52c - 57c, 2001/04

no abstracts in English

Journal Articles

Thin ice target for $$^{16}$$O (p,p') experiment

Kawabata, Takahiro*; Akimune, Hidetoshi*; Fujimura, Hisako*; Fujita, Hirohiko*; Fujita, Yoshitaka*; Fujiwara, Mamoru; Hara, Keigo*; Hatanaka, Kichiji*; Hosono, K.*; Ishikawa, Takatsugu*; et al.

Nuclear Instruments and Methods in Physics Research A, 459(1-2), p.171 - 176, 2001/02

 Times Cited Count:17 Percentile:76.5(Instruments & Instrumentation)

no abstracts in English

Oral presentation

Precise measurements of projectile charge changing cross sections for intermediate energy heavy ions

Chiba, Satoshi; Ota, Shuya*; Yasuda, Nakahiro*; Sihver, L.*; Kodaira, Satoshi*; Ideguchi, Yusuke*; Hasebe, Nobuyuki*

no journal, , 

no abstracts in English

Oral presentation

Radioactive nuclides in soil at northern Ibaraki prefecture from Fukushima Daiichi Nuclear Power Plant

Kaneya, Yusuke*; Sato, Tetsuya; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Sato, Nozomi; Oe, Kazuhiro; Miyamoto, Yutaka; Yasuda, Kenichiro; Ninomiya, Kazuhiko; et al.

no journal, , 

We have measured radioactivities in soils contaminated by the severe accident of Fukushima Daiichi Nuclear Power Plant. The soil samples were taken at the 83 points distributed around the north area of Ibaraki prefecture. Radioactivities in the soils were measured by $$gamma$$-ray spectrometry, and distributions of $$^{134,137}$$Cs in this area were clarified. The highest radioactivity of 130 kBq/m$$^{2}$$ of $$^{137}$$Cs was observed at the boundary among Tochigi, Fukushima, and Ibaraki prefecture, while it was about 3 kBq/m$$^{2}$$ at the center of Ibaraki.

Oral presentation

Precise measurements of projectile charge changing cross sections for intermediate energy heavy ions

Ota, Shuya*; Yasuda, Nakahiro*; Sihver, L.*; Kodaira, Satoshi*; Ideguchi, Yusuke*; Hasebe, Nobuyuki*

no journal, , 

Projectile charge-changing cross sections for nuclei in galactic cosmic rays (GCRs) on hydrogen play essentially important roles for the study of origin and source composition of GCRs. Previous experimental and theoretical works done so far made much progress on those cross sections. However, there are still uncertainties in much of the cross section data, and therefore the present knowledge of cross sections has not led to successful determination of the GCR source composition. To improve the uncertainties, a novel measurement system of projectile charge-changing cross section using CR-39 plastic nuclear track detectors with excellent position and nuclear charge resolutions has been developed. We carried out measurements of total and partial charge-changing cross sections for Fe and Mg on $$C$$ and $$CH_2$$ targets at 0.1 to 1 GeV/n using the method.

Oral presentation

Distribution of radioisotopes on soil in North Ibaraki prefecture discharged from the Fukushima Daiichi Nuclear Power Plant

Kaneya, Yusuke*; Sato, Tetsuya; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Sato, Nozomi; Oe, Kazuhiro; Miyamoto, Yutaka; Yasuda, Kenichiro; Ninomiya, Kazuhiko; et al.

no journal, , 

The massive earthquakes and the following tsunami that struck the Tohoku and north Kanto regions of Japan on 11 March 2011 caused severe damage of the Fukushima Dai-ichi Nuclear Power Plant. In consequence, a large amount of radio isotopes accumulated in the nuclear reactor was discharged to environment of Tohoku and Kanto region. Assessment of individual radionuclide distributions on soil in the area is required because of estimation of radiation dose rate for people in the area from the contaminated surface, planning for cultivation, and establishment of regional land utilization. We performed to collect soil samples around north part of Ibaraki prefecture, and measured $$gamma$$-ray of soil samples by using high pure Ge detectors, and assessed the individual distribution of radio isotopes.

Oral presentation

Neurocytotoxic effects of microbeam irradiation of heavy carbon-ions on the developing brain measured in vivo using medaka (${it Oryzias latipes}$), a vertebrate model

Yasuda, Takako*; Oda, Shoji*; Hibi, Yusuke*; Urushihara, Yusuke*; Mitani, Hiroshi*; Funayama, Tomoo; Yokota, Yuichiro; Muto, Yasuko; Ikeda, Hiroko; Kobayashi, Yasuhiko

no journal, , 

Using heavy-ion microbeam system of JAEA-Takasaki, we irradiated brain of the embryos of the Medaka with carbon ion microbeam. After irradiation, inductions of apoptosis were observed using whole-mount staining of acridine orange. In targeted position of the brain, we observed the induction of radiation induced apoptosis, indicating that the system can irradiate specific region of the brain of the Medaka embryo.

Oral presentation

The Systemic effects of irradiation revealed by the local irradiation to the medaka testis using carbon-ion microbeam system in TIARA

Oda, Shoji*; Yasuda, Takako*; Hibi, Yusuke*; Asaka, Tomomi*; Ikeda, Hiroko; Muto, Yasuko*; Yokota, Yuichiro; Sakashita, Tetsuya; Suzuki, Michiyo; Funayama, Tomoo; et al.

no journal, , 

We have developed a new irradiation protocol for tissue specific irradiation to living embryo and adult medaka, ${it Oryzias latipes}$. In the study, a testis of p53 knockout fish were irradiated with multi-shots of microbeam. Less numbers of testis-ova were induced in the in p53- lacking testis 1 week after the irradiation compared to whole body irradiated testis. Specific irradiation of microbeam onto the right (or left) lobe of the optic tectum in medaka embryos of 2 days post fertilization ectopically induced apoptotic cells in the body trunk and the tail in addition to the irradiated position. The systemic effects as endocrine system, autonomic nervous system and immunity reactions occur in adult medaka and these results suggested that the systemic effects might be functional even in developing embryos.

Oral presentation

Preliminary analysis of long-term evolution for geological environment around drift in the Horonobe Underground Research Laboratory

Goke, Mitsuo*; Okihara, Mitsunobu*; Maemura, Tsuneyuki*; Yasuda, Ryo*; Matsui, Hiroya; Ozaki, Yusuke; Mochizuki, Akihito

no journal, , 

We performed the numerical simulation to simulate the long term change in geological environment under open drift condition. We developed the conceptual model for the purpose and performed the geomechanical and hydrological simulation with the models considering the existence of excavation damaged zone and tunnel support. The geomechanical simulation results suggested that the deformation for long term is so slight that the excavation damaged zone does not enlarge. The hydrological simulation considering the degassing predicted the expansion of the unsaturated zone in the high pore pressure domain.

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