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Journal Articles

Nihonium; Physics in superheavy elements and superheavy nuclei

Koura, Hiroyuki

Nihoniumu, Chojugenso, Chojukaku No Butsuri; Kihon Hosoku De Yomitoku Butsurigaku Saizensen, 24, 236 Pages, 2021/06

no abstracts in English

Journal Articles

Result of questionnaire of "JAEA Chart of the Nuclides"

Minato, Futoshi; Koura, Hiroyuki

Kaku Deta Nyusu (Internet), (127), p.46 - 62, 2020/10

no abstracts in English

Journal Articles

JAEA nuclear chart 2018

Koura, Hiroyuki

Kaku Deta Nyusu (Internet), (127), p.38 - 45, 2020/10

no abstracts in English

Journal Articles

23rd Technical Meeting of the International Network of Nuclear Structure and Decay Data Evaluators

Koura, Hiroyuki

Kaku Deta Nyusu (Internet), (124), p.1 - 13, 2019/10

no abstracts in English

Journal Articles

Nuclear properties of superheavy elements

Koura, Hiroyuki

Chojugenso Kagaku No Saizensen; Furonteia Shirizu, 2, p.49 - 58, 2019/09

no abstracts in English

Journal Articles

Nuclear data sheets for A=218

Singh, B.*; Basunia, M. S.*; Martin, M.*; McCutchan, E. A.*; Bara, I.*; Caballero-Folch, R.*; Canavan, R.*; Chakrabarti, R.*; Chekhovska, A.*; Grinder, M. M.*; et al.

Nuclear Data Sheets, 160, p.405 - 471, 2019/09

 Times Cited Count:3 Percentile:52.47(Physics, Nuclear)

Journal Articles

Report on "Joint IAEA-ICTP Workshop on Nuclear Structure and Decay Data; Experiment, Theory and Evaluation"

Koura, Hiroyuki

Kaku Deta Nyusu (Internet), (123), p.1 - 11, 2019/06

no abstracts in English

Journal Articles

Analysis of nuclear structure in the nuclear chart and improvement to the gross theory of $$beta$$ decay

Endo, Fumitaka*; Koura, Hiroyuki

Physical Review C, 99(3), p.034303_1 - 034303_8, 2019/03

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

JAEA Reports

Proceedings of the 2017 Symposium on Nuclear Data; November 16-17, 2017, iVil, Tokai-mura, Ibaraki, Japan

Nishio, Katsuhisa; Utsuno, Yutaka; Chiba, Satoshi*; Koura, Hiroyuki; Iwamoto, Osamu; Nakamura, Shoji

JAEA-Conf 2018-001, 226 Pages, 2018/12

JAEA-Conf-2018-001.pdf:22.81MB

The 2017 Symposium on Nuclear Data was held at iVil in Tokai on November 16-17, 2017. The symposium was hosted by the Nuclear Data Division of the Atomic Energy Society of Japan (AESJ) and Advanced Science Research Center of Japan Atomic Energy Agency, and co-hosted by Japanese Nuclear Data Committee of AESJ and North Kanto Branch of AESJ. In the symposium, a tutorial was given by Prof. Rykaczewski (ORNL) "New nuclear data from total absorption spectroscopy and beta-delayed neutron measurements", as well as six oral sessions, "Nuclear Physics and Nuclear Data" (two sessions), "Nuclear Theory and Nuclear Data", "Reactors" and "Nuclear Data and Their Applications" (two sessions). In addition, recent advances in experiment, theory, evaluation, benchmark, and application were presented in the poster session. The symposium had 79 participants, who contributed to very active and fruitful discussions. This report consists of 37 papers, including those of 14 oral and 23 poster presentations.

Journal Articles

First direct mass measurements of nuclides around $$Z$$ = 100 with a multireflection time-of-flight mass spectrograph

Ito, Yuta*; Schury, P.*; Wada, Michiharu*; Arai, Fumiya*; Haba, Hiromitsu*; Hirayama, Yoshikazu*; Ishizawa, Satoshi*; Kaji, Daiya*; Kimura, Sota*; Koura, Hiroyuki; et al.

Physical Review Letters, 120(15), p.152501_1 - 152501_6, 2018/04

 Times Cited Count:47 Percentile:95.52(Physics, Multidisciplinary)

Masses of $$^{246}$$Es, $$^{251}$$Fm and the transfermium nuclei $$^{249-252}$$Md, and $$^{254}$$No, produced by hot- and cold-fusion reactions, in the vicinity of the deformed $$N=152$$ neutron shell closure, have been directly measured using a multi-reflection time-of-flight mass spectrograph. The masses of $$^{246}$$Es and $$^{249,250,252}$$Md were measured for the first time. Using the masses of $$^{249,250}$$Md as anchor points for $$alpha$$ decay chains, the masses of heavier nuclei, up to $$^{261}$$Bh and $$^{266}$$Mt, were determined. These new masses were compared with theoretical global mass models and demonstrated to be in good agreement with macroscopic-microscopic models in this region. The empirical shell gap parameter $$delta_{2n}$$ derived from three isotopic masses was updated with the new masses and corroborate the existence of the deformed $$N=152$$ neutron shell closure for Md and Lr.

Journal Articles

Nihonium, and the next elements...

Sakurai, Hiroshi*; Shinohara, Atsushi*; Koura, Hiroyuki; Kamigaito, Osamu*; Morimoto, Koji*; Haba, Hiromitsu*; Enyo, Hideto*

Isotope News, (特別号2), p.2 - 14, 2018/01

no abstracts in English

Journal Articles

Improvement of gross theory of beta-decay on single particle treatment

Koura, Hiroyuki; Yoshida, Tadashi*; Tachibana, Takahiro*; Chiba, Satoshi*

JAEA-Conf 2017-001, p.205 - 210, 2018/01

no abstracts in English

Journal Articles

Cutting-edge studies on nuclear data for continuous and emerging need, 4; Nuclear chart; Magnificent landscape of nuclei

Koura, Hiroyuki; Minato, Futoshi; Iimura, Hideki

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 60(1), p.35 - 40, 2018/01

no abstracts in English

Journal Articles

Improvement of gross theory of beta-decay for application to nuclear data

Koura, Hiroyuki; Yoshida, Tadashi*; Tachibana, Takahiro*; Chiba, Satoshi*

EPJ Web of Conferences, 146, p.12003_1 - 12003_4, 2017/09

BB2016-0950.pdf:0.33MB

 Times Cited Count:1 Percentile:69.68

Journal Articles

Observation of doubly-charged ions of francium isotopes extracted from a gas cell

Schury, P.*; Wada, Michiharu*; Ito, Yuta*; Kaji, Daiya*; Haba, Hiromitsu*; Hirayama, Yoshikazu*; Kimura, Sota*; Koura, Hiroyuki; MacCormick, M.*; Miyatake, Hiroari*; et al.

Nuclear Instruments and Methods in Physics Research B, 407, p.160 - 165, 2017/06

 Times Cited Count:9 Percentile:79.25(Instruments & Instrumentation)

Various isotopes of Ac, Ra, Fr, and Rn were produced by fusion-evaporation reactions using a $$^{48}$$Ca beam. The energetic ions were stopped in and extracted from a helium gas cell. The extracted ions were identified using a multi-reflection time-of-fight mass spectrograph. In all cases, it was observed that the predominant charge state for the extracted ions, including the alkali Fr, was 2+.

Journal Articles

Improvement of the gross theory of $$beta$$ decay by inclusion of change in parity

Koura, Hiroyuki; Chiba, Satoshi*

Physical Review C, 95(6), p.064304_1 - 064304_6, 2017/06

AA2016-0436.pdf:0.78MB

 Times Cited Count:8 Percentile:66.67(Physics, Nuclear)

An improvement on the single-particle structure is carried out to a global $$beta$$-decay model, the gross theory. The gross theory is based on a consideration of the sum rule of the intensity of the $$beta$$-decay transition by using the strength function. This model gives reasonable results of $$beta$$-decay rates and delayed neutron in the entire nuclear mass region. An attempt is made to improve the gross theory of nuclear $$beta$$-decay on consideration of the change of parity on the single-particle level of ground-state nuclei. In this treatment, the nuclear matrix elements are suppressed when the parity between single neutron and proton levels is different for the allowed transition. The assignment of parity is done by using the Woods-Saxon type single-particle potential. The discrepancies from experimental half-lives, which appeared in the vicinity on the magic number of neutrons and protons, are systematically improved in the nuclear mass region.

Journal Articles

Nuclear chemistry; With nuclear chart

Koura, Hiroyuki

Kagaku To Kyoiku, 65(3), p.108 - 111, 2017/03

no abstracts in English

Journal Articles

Journal Articles

First online multireflection time-of-flight mass measurements of isobar chains produced by fusion-evaporation reactions; Toward identification of superheavy elements via mass spectroscopy

Schury, P.*; Wada, Michiharu*; Ito, Yuta*; Kaji, Daiya*; Arai, Fumiya*; MacCormick, M.*; Murray, I.*; Haba, Hiromitsu*; Jeong, S.*; Kimura, Sota*; et al.

Physical Review C, 95(1), p.011305_1 - 011305_6, 2017/01

AA2016-0638.pdf:0.71MB

 Times Cited Count:33 Percentile:96.3(Physics, Nuclear)

Using a multireflection time-of-flight mass spectrograph located after a gas cell coupled with the gas-filled recoil ion separator GARIS-II, the masses of several $$alpha$$-decaying heavy nuclei were directly and precisely measured. The nuclei were produced via fusion-evaporation reactions and separated from projectilelike and targetlike particles using GARIS-II before being stopped in a helium-filled gas cell. Time-of-flight spectra for three isobar chains, $$^{204}$$Fr-$$^{204}$$Rn-$$^{204}$$At-$$^{204}$$Po, $$^{205}$$Fr- $$^{205}$$Rn-$$^{205}$$At-$$^{205}$$Po-$$^{205}$$Bi, and $$^{206}$$Fr-$$^{206}$$Rn-$$^{206}$$At, were observed. Precision atomic mass values were determined for $$^{204-206}$$Fr, $$^{204,205}$$Rn, and $$^{204,205}$$At. Identifications of $$^{205}$$Bi, $$^{204,205}$$Po, $$^{206}$$Rn, and $$^{206}$$At were made with N$$leq$$10 detected ions, representing the next step toward use of mass spectrometry to identify exceedingly low-yield species such as superheavy element ions.

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