Elucidating shell evolution in terms of a unified description of medium-heavy unstable nuclei
Project/Area Number |
15K05094
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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Research Institution | Japan Atomic Energy Agency |
Principal Investigator |
UTSUNO Yutaka 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 先端基礎研究センター, 研究主幹 (10343930)
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Co-Investigator(Kenkyū-buntansha) |
清水 則孝 東京大学, 大学院理学系研究科(理学部), 特任准教授 (30419254)
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Research Collaborator |
Honma Michio
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Project Period (FY) |
2015-04-01 – 2019-03-31
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Project Status |
Completed (Fiscal Year 2018)
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Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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Keywords | 殻進化 / 大規模殻模型計算 / 不安定核 / 殻模型 / ベータ崩壊 / カイラルバンド / 集団運動 / 殻構造 / 核子間相関 / 核準位密度 |
Outline of Final Research Achievements |
Performing large-scale shell-model calculations in the mass number 40-60 and 100-130 regions, we have identified the effect of varying shell structure in neutron-rich nuclei (so-called shell evolution) on complex nuclear many-body systems, and clarified the universality of shell evolution. For the mass number 40-60 region, by using appropriate single-particle levels based on the shell-evolution picture, we have simultaneously reproduced the equilibration of positive- and negative-parity level density and the dominance of positive-parity states at low energy for the first time, and obtained excellent beta-decay half-lives and Gamow-Teller strength distribution. For the mass number 100-130 region, we have well described the change of the h11/2 orbital with changing mass number, thus successfully reproduced the chiral bands in which this orbital plays a crucial role.
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Academic Significance and Societal Importance of the Research Achievements |
中性子過剰核における殻進化を、正確な多体相関を取り入れた計算に基づいて解き明かす研究はこれまでかなり限られていたため、殻進化の定量的理解に大きな不確定性があり、その核構造への影響の範囲もはっきりとしなかった。本研究によって、閉殻近傍の一粒子的状態だけでなく、準位密度、ベータ崩壊、集団運動など広い範囲で殻進化が重要な役割を果たしていることがわかり、中性子過剰核の統一的理解に大きく貢献した。これは、実験が困難なr過程元素合成過程についての信頼できる理論核データを提供する上でも重要である。
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Report
(5 results)
Research Products
(72 results)
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[Journal Article] g-factor measurement of the 2738 keV isomer in La1352019
Author(s)
Laskar Md. S. R.、Saha S.、Palit R.、Mishra S. N.、Shimizu N.、Utsuno Y.、Ideguchi E.、Naik Z.、Babra F. S.、Biswas S.、Kumar S.、Mohanta S. K.、Palshetkar C. S.、Singh P.、Srivastava P. C.
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Journal Title
Physical Review C
Volume: 99
Issue: 1
Pages: 014308-014308
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Structure of Sc55 and development of the N=34 subshell closure2017
Author(s)
Steppenbeck D.、Takeuchi S.、Aoi N.、Doornenbal P.、Matsushita M.、Wang H.、Baba H.、Go S.、Holt J. D.、Lee J.、Matsui K.、Michimasa S.、Motobayashi T.、Nishimura D.、Otsuka T.、Sakurai H.、Shiga Y.、Soderstrom P.-A.、Stroberg S. R.、Sumikama T.、Taniuchi R.、Tostevin J. A.、Utsuno Y.、Valiente-Dobon J. J.、Yoneda K.
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Journal Title
Physical Review C
Volume: 96
Issue: 6
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Intruder configurations in the ground state of 30Ne2017
Author(s)
H.N. Liu, J. Lee, P. Doornenbal, H. Scheit, S. Takeuchi, N. Aoi, K.A. Li, M. Matsushita, D. Steppenbeck, H. Wang, H. Baba, E. Ideguchi, N. Kobayashi, Y. Kondo, G. Lee, S. Michimasa, T. Motobayashi, A. Poves, H. Sakurai, M. Takechi, Y. Togano, J.A. Tostevin, Y. Utsuno
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Journal Title
Physics Letters B
Volume: 767
Pages: 58-62
DOI
NAID
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Beta decay of 38, 40Si (Tz =+5, +6) to low-lying core excited states in odd-odd 38-40P isotopes2017
Author(s)
V. Tripathi, R.S. Lubna, B. Abromeit, H.L. Crawford, S.N. Liddick, Y. Utsuno, P.C. Bender, B.P. Crider, R. Dungan, P. Fallon, K. Kravvaris, N. Larson, A.O. Macchiavelli, T. Otsuka, C.J. Prokop, A.L. Richard, N. Shimizu, S.L. Tabor, A. Volya, S. Yoshida
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Journal Title
Physical Review C
Volume: 95
Issue: 2
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] High-precision quadrupole moment reveals significant intruder component in 33Al ground state2016
Author(s)
H. Heylen, M.De Rydt, G. Neyens, M.L. Bissell, L. Caceres, R. Chevrier, J.M. Daugas, Y. Ichikawa, Y. Ishibashi, O. Kamalou, T.J. Mertzimekis, P. Morel, J. Papuga, A. Poves, M.M. Rajabali, C. Stodel, J.C. Thomas, H. Ueno, Y. Utsuno, N. Yoshida, A. Yoshimi
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Journal Title
Physical Review C
Volume: 94
Issue: 3
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] One-neutron pickup into 49Ca: Bound neutron g9/2 spectroscopic strength at N=292016
Author(s)
A. Gade, J. A. Tostevin, V. Bader, T. Baugher, D. Bazin, J. S. Berryman, B. A. Brown, D. J. Hartley, E. Lunderberg, F. Recchia, S. R. Stroberg, Y. Utsuno, D. Weisshaar, K. Wimmer
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Journal Title
Physical Review C
Volume: 93
Issue: 3
DOI
NAID
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Low-Lying Structure of 50Ar and the N=32 Subshell Closure2015
Author(s)
D. Steppenbeck, S. Takeuchi, N. Aoi, P. Doornenbal, M. Matsushita, H. Wang, Y. Utsuno, H. Baba, S. Go, J. Lee, K. Matsui, S. Michimasa, T. Motobayashi, D. Nishimura, T. Otsuka, H. Sakurai, Y. Shiga, N. Shimizu, P.-A. Soderstrom, T. Sumikama, R. Taniuchi, J.J. Valiente-Dobon, K. Yoneda
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Journal Title
Physical Review Letters
Volume: 114
Issue: 25
Pages: 252501-252501
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Nuclear structure of 37, 38Si investigated by decay spectroscopy of 37, 38Al2015
Author(s)
K. Steiger, S. Nishimura, Z. Li, R. Gernhauser, Y. Utsuno, R. Chen, T. Faestermann, C. Hinke, R. Krucken, M. Kurata-Nishimura, G. Lorusso,Y. Miyashita, N. Shimizu, K. Sugimoto, T. Sumikama, H. Watanabe, K. Yoshinaga
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Journal Title
The European Physical Journal A
Volume: 51
Issue: 9
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Presentation] ベイズ統計による殻模型計算解析2017
Author(s)
清水則孝, 富樫智章, 大塚孝治, 宇都野穣, 吉田聡太
Organizer
日本物理学会第72回年次大会
Place of Presentation
大阪大学(大阪府・豊中市)
Year and Date
2017-03-17
Related Report
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[Presentation] Shell model study of nuclei around N=802015
Author(s)
N. Shimizu, M. Honma, T. Mizusaki, T. Otsuka, T. Togashi, N. Tsunoda, Y. Tsunoda, Y. Utsuno
Organizer
YIPQS Long-term and Nishinomiya-Yukawa Memorial International workshop Computational Advances in Nuclear and Hadron Physics (CANHP 2015)
Place of Presentation
京都大学(京都府・京都市)
Year and Date
2015-09-28
Related Report
Int'l Joint Research
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