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Journal Articles

$$alpha$$-decay properties of $$^{200,202}$$Fr

Ghys, L.*; Andreyev, A. N.; Huyse, M.*; Van Duppen, P.*; Antalic, S.*; Barzakh, A.*; Capponi, L.*; Cocolios, T. E.*; Cubiss, J.*; Derkx, X.*; et al.

Physical Review C, 100(5), p.054310_1 - 054310_13, 2019/11

 Times Cited Count:9 Percentile:86.57(Physics, Nuclear)

Journal Articles

Inverse odd-even staggering in nuclear charge radii and possible octupole collectivity in $$^{217,218,219}$$At revealed by in-source laser spectroscopy

Barzakh, A. E.*; Cubiss, J. G.*; Andreyev, A. N.; Seliverstov, M. D.*; Andel, B.*; Antalic, S.*; Ascher, P.*; Atanasov, D.*; Beck, D.*; Biero$'n$, J.*; et al.

Physical Review C, 99(5), p.054317_1 - 054317_9, 2019/05

 Times Cited Count:5 Percentile:69.53(Physics, Nuclear)

Journal Articles

Charge radii and electromagnetic moments of $$^{195-211}$$At

Cubiss, J.*; Andreyev, A. N.; Mitsuoka, Shinichi*; Nagame, Yuichiro; Nishio, Katsuhisa; Ota, Shuya*; Wakabayashi, Yasuo*; 60 of others*

Physical Review C, 97(5), p.054327_1 - 054327_19, 2018/05

 Times Cited Count:22 Percentile:93.58(Physics, Nuclear)

Journal Articles

Simultaneous measurement of neutron-induced fission and capture cross sections for $$^{241}$$Am at neutron energies below fission threshold

Hirose, Kentaro; Nishio, Katsuhisa; Makii, Hiroyuki; Nishinaka, Ichiro*; Ota, Shuya*; Nagayama, Tatsuro*; Tamura, Nobuyuki*; Goto, Shinichi*; Andreyev, A.; Vermeulen, M. J.; et al.

Nuclear Instruments and Methods in Physics Research A, 856, p.133 - 138, 2017/06

 Times Cited Count:3 Percentile:40.62(Instruments & Instrumentation)

Journal Articles

$$beta$$-delayed fission and $$alpha$$ decay of $$^{196}$$At

Truesdale, V. L.*; Andreyev, A.; Ghys, L.*; Huyse, M.*; Van Duppen, P.*; Sels, S.*; Andel, B.*; Antalic, S.*; Barzakh, A.*; Capponi, L.*; et al.

Physical Review C, 94(3), p.034308_1 - 034308_11, 2016/09

 Times Cited Count:9 Percentile:65.08(Physics, Nuclear)

Journal Articles

Development of a measurement system for the determination of ($$n,gamma$$) cross-sections using multi-nucleon transfer reactions

Makii, Hiroyuki; Ota, Shuya*; Ishii, Tetsuro; Wakabayashi, Yasuo*; Furutaka, Kazuyoshi; Nishio, Katsuhisa; Nishinaka, Ichiro; Chiba, Satoshi; Igashira, Masayuki*; Czeszumska, A.*

Nuclear Instruments and Methods in Physics Research A, 797, p.83 - 93, 2015/10

 Times Cited Count:3 Percentile:32.14(Instruments & Instrumentation)

We have installed new experimental apparatus to measure $$gamma$$ rays from highly excited states populated by the multi-nucleon transfer reactions with heavy-ion projectiles to determine the ($$n, gamma$$) cross sections by means of the surrogate reaction method. Apparatus consists of two anti-Compton LaBr$$_{3}$$(Ce) spectrometers to measure the $$gamma$$ rays and a Si $${Delta}E$$-$$E$$ detector system to detect outgoing projectile-like particles. Reactions of 153-MeV $$^{18}$$O beams with $$^{155}$$Gd and $$^{157}$$Gd targets were used to study the performance of apparatus. By using the LaBr$$_{3}$$(Ce) scintillators with relatively large volume (101.6 mm in diameter and 127 mm in length), we have successfully measured $$gamma$$ rays from the compound nuclei, which have excitation energy above neutron separation energy, populated by $$^{155}$$Gd($$^{18}$$O, $$^{16}$$O)$$^{157}$$Gd and $$^{157}$$Gd($$^{18}$$O, $$^{16}$$O)$$^{159}$$Gd two-neutron transfer reactions. The present study has demonstrated high capability of apparatus to measure the de-excitation $$gamma$$ rays in the compound nuclei produced by the multi-nucleon transfer reactions for determination of the ($$n, gamma$$) cross sections by using the surrogate reaction method.

Journal Articles

Development of anti-Compton LaBr$$_{3}$$(Ce) spectrometer for measurement of surrogate reactions

Makii, Hiroyuki; Ota, Shuya*; Ishii, Tetsuro; Nishio, Katsuhisa; Nishinaka, Ichiro; Furutaka, Kazuyoshi; Wakabayashi, Yasuo*; Chiba, Satoshi*; Igashira, Masayuki*

Nuclear Data Sheets, 119, p.361 - 364, 2014/05

 Times Cited Count:0 Percentile:0.02(Physics, Nuclear)

Anti-Compton LaBr$$_{3}$$(Ce) spectrometers have been installed at JAEA-Tokai tandem accelerator facility in order to measure the $$gamma$$ rays from the highly excited states produced by surrogate reactions. Each spectrometer consists of a central LaBr$$_{3}$$(Ce) detector with a diameter of 10.2 cm and a length of 12.7 cm, and an annular BGO detector with a thickness of 2.5 cm and a length of 25.4 cm. In this contribution, we will present the results of performance test using the standard $$gamma$$ ray source and high-energy $$gamma$$ rays from the $$^{27}$$Al(p,$$gamma$$)$$^{28}$$Si reaction, and a measurement plan for (n,$$gamma$$) cross sections using a surrogate reaction at JAEA-Tokai tandem accelerator facility.

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

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

Implementation of EGS5 physics into PHITS

Iwase, Hiroshi*; Namito, Yoshihito*; Hirayama, Hideo*; Niita, Koji*; Hashimoto, Shintaro; Matsuda, Norihiro; Noda, Shusaku; Ota, Shuya*; Iwamoto, Yosuke; Sato, Tatsuhiko; et al.

no journal, , 

The Electron Gamma Shower (EGS), which has been developed by Univ. of Michigan, SLAC, Canadian government, KEK etc., is one of the electrons and $$gamma$$-ray shower transport Monte Carlo code. The EGS5 code is used in various fields of radiation shielding of accelerator facilities, design of radiation detectors, dose estimation in medical application, and so on. The Particle and Heavy Ion Transport code System PHITS, the multi-purpose and multi-particle Monte Carlo code, has a lot of useful user-interfaces and output functions. It would be of great benefit to EGS users if EGS5 can be operated in the PHITS system, and to PHITS users too, if the EGS5 physics can be used in the PHITS code. The EGS5 models are divided into some parts and implemented in the PHITS code in a manner that the calculation procedure is identical to the original EGS5 so that users can obtain same results.

Oral presentation

Surrogate reaction study at JAEA, 2; Measurement of fission cross sections

Nishio, Katsuhisa; Nagayama, Tatsuro*; Nishinaka, Ichiro; Mitsuoka, Shinichi; Makii, Hiroyuki; Ota, Shuya*; Furutaka, Kazuyoshi; Tsukada, Kazuaki; Asai, Masato; Ishii, Tetsuro; et al.

no journal, , 

no abstracts in English

Oral presentation

Depth dependency of neutron density produced by galactic cosmic rays in the lunar subsurface

Ota, Shuya; Sihver, L.*; Kobayashi, Shingo*; Hasebe, Nobuyuki*

no journal, , 

Neutron production by galactic cosmic rays (GCR) in the lunar subsurface plays an important role in the radiation environment on the surface and subsurface of the Moon and to make its accurate estimation is therefore very important for lunar and planetary nuclear spectroscopy and space dosimetry. In this work, the depth dependency of neutron production from protons and alpha particles in galactic cosmic ray (GCR) was estimated using the three-dimensional particle and heavy ion transport simulation code PHITS incorporating the latest high energy nuclear data, JENDL-HE. Our estimation of equilibrium neutron density profiles in the lunar subsurface was compared with the experimental data obtained by Apollo 17 Lunar Neutron Probe Experiment (LNPE). As the results, our calculation successfully reproduced the LNPE data within experimental errors of 15% (measurement) + 30% (systematic).

Oral presentation

Study on low-energy resonances of $$^{22}$$Ne ($$alpha$$,$$gamma$$) $$^{26}$$Mg using $$^{22}$$Ne + $$^6$$Li reaction

Ota, Shuya; Makii, Hiroyuki; Ishii, Tetsuro; Nishio, Katsuhisa; Mitsuoka, Shinichi; Nishinaka, Ichiro; Chiba, Satoshi

no journal, , 

While the reaction $$^{22}$$Ne ($$alpha$$,n) $$^{25}$$Mg in stellar helium burning is considered to be the dominant neutron source for s-process in massive stars with M $$>$$ 8 solar mass, the competing $$^{22}$$Ne ($$alpha$$,$$gamma$$) $$^{26}$$Mg reaction may be considerable strength and significantly reduce the neutron production. A branching ratio of the two reactions and resonance parameters such as levels and strengths in $$^{26}$$Mg produced by $$alpha$$ + $$^{22}$$Ne should be experimentally determined with good accuracy. Presently, uncertainty in the observed resonance levels at E$$_{alpha}$$ (830 keV) have not been cleared up despite their important roles in the neutron production. In this work, we set our goal to investigate this low energy resonance. Experiments were performed using $$^{22}$$Ne beam at Tokai Tandem accelerator in Japan Atomic Energy Agency. In this symposium, we will present our experimental scheme and future prospective.

Oral presentation

Research in surrogate reactions at JAEA,3; Determination of neutron capture cross section

Makii, Hiroyuki; Ishii, Tetsuro; Ota, Shuya*; Nishio, Katsuhisa; Nagayama, Tatsuro*; Nishinaka, Ichiro; Furutaka, Kazuyoshi; Mitsuoka, Shinichi

no journal, , 

no abstracts in English

Oral presentation

Study of delayed-neutron yields for acculate evaluation of kinetics of high-burnup reactors, 2; Measurement of fission fragnment mass distributions for actinide nuclei by surrogate method

Nishio, Katsuhisa; Hirose, Kentaro; Nishinaka, Ichiro; Makii, Hiroyuki; Ota, Shuya; Nagayama, Tatsuro*; Chiba, Satoshi; Tsukada, Kazuaki; Asai, Masato; Ishii, Tetsuro; et al.

no journal, , 

no abstracts in English

Oral presentation

Measurement of neutron capture cross section of Li-7 at J-PARC/MLF/ANNRI

Makii, Hiroyuki; Segawa, Mariko; Ota, Shuya*; Kimura, Atsushi; Nishinaka, Ichiro; Nishio, Katsuhisa; Harada, Hideo

no journal, , 

The neutron capture cross section of light elements, such as Li, Be, and B, plays an important role in inhomogeneous Big-Bang nucleosynthesis scenarios or in explosive nucleosynthesis, like r-process. However, data for neutron capture reaction of light elements sparse and / or disagree in the astrophysical relevant energy region, since the cross section of light elements is quite small even at the thermal energy. Intense pulsed neutron beam provided by the Material and Life science experimental Facility (MLF) in J-PARC and high performance Ge spectrometer, which is the main detector of the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) installed at Beam Line No. 04 of MLF in the J-PARC, will allow us to study neutron capture reaction of light elements. At first we have measured the neutron capture cross section of Li-7 at the MLF in the J-PARC. In this contribution, we will present the results of the measurement.

Oral presentation

Measurement of neutron capture cross sections of Li-6 and Li-7

Makii, Hiroyuki; Segawa, Mariko; Ota, Shuya*; Kimura, Atsushi; Nishinaka, Ichiro; Nishio, Katsuhisa; Harada, Hideo

no journal, , 

no abstracts in English

Oral presentation

Simultaneous measurement of fission and capture cross sections for minor actinide nuclei

Tamura, Nobuyuki; Nishio, Katsuhisa; Hirose, Kentaro; Nishinaka, Ichiro; Makii, Hiroyuki; Kimura, Atsushi; Ota, Shuya*; Andreyev, A.; Vermeulen, M.*; Gillespire, S.*; et al.

no journal, , 

no abstracts in English

Oral presentation

Fission study by multi-nucleon transfer reaction at JAEA

Hirose, Kentaro; Nishio, Katsuhisa; L$'e$guillon, R.; Makii, Hiroyuki; Nishinaka, Ichiro; Orlandi, R.; Smallcombe, J.; Ishii, Tetsuro; Tsukada, Kazuaki; Asai, Masato; et al.

no journal, , 

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