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Structure and fragmentation of s-hole states in light nuclei

Research Project

Project/Area Number 08640394
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionKANTO GAKUIN UNIVERSITY

Principal Investigator

YAMADA Taichi  Faculty of Engineering, KANTO GAKUIN UNIVERSITY Vassistant Professor, 工学部, 助教授 (70200722)

Co-Investigator(Kenkyū-buntansha) IKEDA Kiyomi  RIKEN, Research Worker, リニアック研, 嘱託研究員 (40011548)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1996: ¥700,000 (Direct Cost: ¥700,000)
Keywordsnuclear structure / nuclear reaction / nuclear fragmentation / quasi elastic scattering / deep hole state / SU(3) model / shell model / cluster model / 原子核構造 / 原子核反応 / 励起スペクトラム / 選択則 / 部分分解幅 / 軽い核 / 核子崩壊寿命 / nuclear SU(3)群 / 原子殻理論 / s-hole state / フラグメンテーション / 戸口状態 / 分解幅
Research Abstract

We have studied the structure and fragmentation of s-hole states in light nuclei, which are related closely to the study of hypernuclei and the measurement of nucleon lifetime etc.
・ SU(3) model for s-hole states and a selection rule
We proposed the SU(3) model for s-hole states in light nuclei. This model is based on the fact that the s-hole state produced by the quasifree knockout reactions such as a ィイD1AィエD1Z(p, 2p) should have the same spatial symmetry as the ground state of the target nucleus, and the ground-state wave function of light nuclei is described well by the SU(3) nuclear wave function. The main results are given as follows : 1) The doorway-stage fragmentation process of the s-hole state in light nuclei is superior or competitive to the compound-stage one. 2) A selection rule is found for fragmentation of doorway s-hole states in light nuclei ; in the two-body fragmentation process of the doorway s-hole states, smaller fragments than the α particle are allowed, while the … More fragments such as the α particle and the larger particles are suppressed, in spite of the large Q value for the α fragment.
・ Experiments on the fragmentation of ィイD111ィエD1B(s-hole) and ィイD115ィエD1N(s-hole) produced by the EィイD2pィエD2 = 392 MeV ィイD112ィエD1C, ィイD116ィエD1O(p, 2p) reactions at RCNP, Osaka University
The two experiments were performed at RCNP (E81 and E110), and their analyses have been in progress now. The major results are given as follows. 1) The α fragmentation from the ィイD111ィエD1B(s-hole) and ィイD115ィエD1N(s-hole) states is found to be suppressed in comparison with the p, d and t ones, in spite of the large Q value of the α channel. This result is consistent with our prediction, and is not able to be explained with only the statistical model. 2) The s-hole state of ィイD111ィエD1B splits into three components to show the bump structure in the excitation spectrum of ィイD111ィエD1B. The three bumps have different branchingratios for p-, d-, t- and α-fragments.
・ ィイD112ィエD1C(p, 2p) excitation function with the 1hΩ shell model
In order to study the origin of the bump structure, we analyzed the ィイD112ィエD1C(p, 2p) excitation function with the 1hΩ shell-model wave function. Reflecting the spatial symmetry of the target nucleus ィイD112ィエD1C with the main (second main) SU(3)[f](λμ) component [444](04) (([4431](12)), three SU(3) basis states of ィイD111ィエD1B, [443](04), [4421](04), [4421](12), are found to play an important role to produce the bump structure. This result indicated that the formation of the structure of the s-hole state in the ィイD1AィエD1Z(p, 2p) excitation function is attributed to the spatial symmetry of the target nucleus. This is due to the characteristic of the quasifree knockout reaction. Less

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report

Research Products

(31 results)

All Other

All Publications

  • [Publications] T. Yamada et al.: "Selection rule for fragmentation of door-way s-hole states in light nuclei"Physical Review C. 53. 752-764 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] E. Hiyama et al.: "Three-body model study of A = 6 - 7 hypernuclei : Halo and skin structures"Physical Review C. 53. 2075-2085 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Yamada et al.: "Selection rule for fragmentation of door-way s-hole states in light nuclei"Proceedings of the XIV RCNP Osaka International Sympo-siumu on Nuclear Reaction Dy-namics of Nucleon-Hadron Many Body Systems, Osaka, Dec. 6-9 1995, eds., H. Ejiri et at.,(World Scientific, Singapore). 334-338 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H. Toyokawa et al.: "Cluster decays from the deep hole states in ィイD111ィエD1B"Proceedings of the XIV RCNP Osaka International Sympo-siumu on Nuclear Reaction Dy-namics of Nucleon-Hadron Many Body Systems, Osaka, Dec. 6-9 1995, eds., H. Ejiri et at.,(World Scientific, Singapore). 339-343 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Yamada et al.: "Double-Λ, twin-Λ and single-Λ hypernuclear productions for stopped Ξ- particles in ィイD112ィエD1C"Physical Review C. 56. 3216-3230 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Yamada et al: "Double-Λ hypernuclear productions via Ξ hypernuclear states in the ィイD19ィエD1Be(KィイD1-ィエD1,KィイD1+ィエD1)ィイD39(/)ΞィエD3 He reaction"Proceedings of the Internations Workshop on Hypernuclear Physics, Tokyo Dec. 7-8, 1997, eds. T. Motoba et al., Genshikaku Kenkyuu. 41. 81-97 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Ueda et al.: "ΛN and ΛΛ interactions in an OBE model and hypernuclei"Proceedings of the Internation Workshop on H pernuclear Physics, Tokyo, DE 7-8, eds. T. Motoba et al., Geshikaku Kenkyuu. 41. 119-125 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H. Toyokawa et al.: "Cluster decays from the deep hole state in ィイD111ィエD1B via the ィイD112ィエD1C(p,2p)ィイD111ィエD1B reaction at EィイD2pィエD2=392 MeV"Proceedings of the 8th International Conference on Nuch Reaction Mechanism, Varen Jun. 9-14, 1997, eds. E. G8 oh, et al., Suppl. 111. 606-609 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Ueda et al.: "ΛN and ΛΛ interactions in an OBE model and hypernuclei"Progress of Theoretical Physics. 99. 891-896 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K. Tominaga et al.: "An one-boson-exchange potential for ΛN and ΛΛ systems and hypernuclei"Nuclear Physics,. A652. 483-505 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Yamada: "Double-Λ hypernuclear production from systems"Proceedings of the third Japan China Joint Nuclear Physics Symposium, Sendai-Ogatsu-Niigata, Jul. 29, 1997, eds. H. Orihara et al. 243-247 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Yamada: "Productions of double-Λ, twin-Λ and single-Λ hypernuclei from ィイD112ィエD1C+ΞィイD1-ィエD1 systems in the diect reaction picture"Nuclear Physics. A639. 385c-388c (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K. Tominaga et al.: "YN and YY interactions in an OBE model and hypernuclei"Proceedings of the Sendai International Workshop on the Spectroscopy of Hypernuclei, Sendai,Jan. 8-10, 1998, eds. 0.Hashimoto et al., GenshikakuKenkyuu. 43. 37-46 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Yamada: "Production of double-Λ and twin-Λ hypernuclei by Ξ atomic capture in light nuclei"Proceedings of the Sendai International Workshop on the Spectroscopy of Hypernuclei, Sendai,Hashimoto et al., GenshikakuKenkyuu. 43. 249-254 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Yamada: "Double-Λ hypernuclear and ΛΛ-ΞN coupling"Proceedings of the 5-th International Symposium on Mesons and Light Nuclei, Praha, Aug.31 - Sep. 4, 1998, eds. J. Mares et al., (World Scientific, Singa-pore). 166-179 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K. Kato et al.: "Complex scaling method and unstable nuclear physics"Proceedings of the XVII RCNP International Symposiumu on the Innovative Computational Methods in Nuclear Many-Body Problems, Osaka, Nov. 10-15, 1997, eds. H. Horiuchi et al.,(World Scientfic, Singapore). 97-101 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Yamada: "Double-Λ and twin-Λ hypernuclear productions via stopped Ξ particles in light nuclei"Proceedings of the Symposiumu on Hadrons and Nuclei with Strangeness, Beijing, Sep. 22 29, 1997, eds. K. Imal et al., (World Scientfic, Singapore). (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Yamada: "Huyperon mixing in light S = -2 nuclei"Proceedings of the APCTP Workshop on Strangeness Nu-clear Physics, Soul, Feb. 19-23,1999, eds. T. Motoba et al.,. (in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K. Kato: "Dynamical effects on the ィイD19ィエD1Li-n interction induced by Pauli blocking of the JィイD1πィエD1 = 0ィイD1+ィエD1 pairing correlation"Progress of Theoretical Physics. 101. 119-138 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T. Yamada: "Structure of light S = -2 nuclei and hyperon mixing"Proceedings of the 1st Asian Pacific Conference on Few-Body Problems in Physics, Noda/Kashiwa, Aug. 23-28, 1999, eds. S. Oryu et al., (World Scientfic, SingaPore). in press). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Ueda et al.: "ΛN ΛΛand Interactions in an OBE Model and Hypenuclei" Progress of Theoretical Physics. 99・5. 891-896 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Tominaga et al.: "An One-Boson-Exchange Potential for ΛN and ΛΛ Stetems and Hypernuclei" Nuclear Physics. A639・1-2. 483-505 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Yamada: "Production of double-Λ,single-Λ and twin-Λ hypernuclei from ^<12>C+Ξ^- atomic states in the direct reaction picture" Nuclear Physics. A642・1-2. 385c-388c (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Kato et al.: "Dynamical Effects on the ^9Li-n Interaction Induced by Pauli Blocking of the J^π=0^+ Pairing Correlation" Progress of Theoretical Physics. 101・1. 119-138 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] E.Hiyama et al.: "Three-and Four Body Cluster Models of Hypernuclei Using G-Matrix Interactions" Progress of Theretical Physics. 97. 881-889 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Yamada et al.: "Double-Λ Hypernuclear Productions via Ξ^- Hypernuclear States in the ^9Be (K^-,K^+) ^9_8He Reaction" Genshikaku Kenkyuu. 41. 81-97 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Ueda et al.: "ΛN and ΛΛ interactions in an OBE model and hypernuclei" Genshikaku Kenkyuu. 41. 119-125 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Yamada et al.: "Double-Λ,twin Λ and single-Λ hypernuclear productions for stopped Ξ^- particles in ^<12>C" Pysical Review. C56. 3216-3230 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Yamada: "Selection Rule for Fragmentation of Doorway S-Hole States in Light Nuclei" Physical Review C. 53. 752-764 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] E.Hiyama: "Three-body model study of a=6-7 hypernuclei : Halo and sikn structures" Physical Review C. 53. 2075-2085 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] H.Ejiri: "Nuclear Reaction Dynamics of Nucleon-Hadron Many Body System" World Scientific, 492 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-03-31   Modified: 2016-04-21  

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