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NUCLEAR ASTROPHYSICS STUDIES WITH LASER INVERSE-COMPTON γ RAYS

Research Project

Project/Area Number 13640303
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 InstitutionKONAN UNIVERSITY

Principal Investigator

UTSUNOMIYA Hiroaki  KONAN UNIVERSITY, DEPARTMENT OF PHYSICS, PROFESSOR, 理工学部, 教授 (00241167)

Co-Investigator(Kenkyū-buntansha) OHGAKI Hideaki  KYOTO UNIVERSITY, INSTITUTE OF ADVANCE ENERGY, ASSOCIATE PROFESSOR, エネルギー理工学研究所, 助教授 (10335226)
AKIMUNE Hidetoshi  KONAN UNIVERSITY, DEPARTMENT OF PHYSICS, ASSOCIATE PROFESSOR, 理工学部, 助教授 (60319829)
YAMAGATA Tamio  KONAN UNIVERSITY, DEPARTMENT OF PHYSICS, PROFESSOR, 理工学部, 教授 (50068144)
TOYOKAWA Hiroyuki  NATIONAL INSTUTUTE OF ADVANCED INDUSTRIAL SCIEINCE AND TECHNOLOGY, PHOTONICS RESEARCH INSTITUTE, RESEARCHER, 光技術部門, 研究員
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Keywordsphoto disintegration / nuclear astrophysics / origin of elements / nucleosynthesis / p-process / s-process / big bane / laser inverse Compton scattering / レーザー逆コンプトンガンマ線 / ビッグバン元素合成 / 宇宙時計 / ビッグバンD合成 / 超新星^<180>Ta合成 / 最稀少同位元素^<180>Ta / 光中性子反応断面積 / 超新星爆発
Research Abstract

Quasi-monochromatic y rays produced from laser inverse-Compton scattering at AIST(National Institute of Advanced Industrial Science and Technology) were used to photo-disintegrate 1)^9Be of interest for nucleosynthesis in type II supernovae, 2)^<181>Ta for the p-process nucleosynthesis, 3)D for big bang nucleosynthesis, and 4) ^<186>W for the s-process nucleosynthesis. The following results were obtained.
1)^9Be : Photoneutron cross sections were measured at energies from threshold to 6.1MeV. Electromagnetic reduced transition probabilities were determined for the 1/2^+,5/2^-,5/2^+ states in ^9Be and the astrophysical reaction rate for αα(n,γ)^9Be were evaluated.
2)^<181>Ta : Photoneutron cross sections were measured at energies from threshold to 12MeV. The p-process origin of ^<180>Ta in O/Ne rich layers during explosions of massive stars as type II supernovae was discussed based on the Hauser-Feshbach model calculation with the QRPAγ strength function.
3)D : Photoneutron cross sections were measured at energies from threshold to 4.6MeV. The reaction rate for p(n,γ)D was determined with 6% uncertainty in the energy region relevant to big bang nucleosynthesis, providing an experimental foundation for theoretical reaction rates.
4)^<186>W : Photoneutron cross sections were measured at energies from threshold to 10.8MeV. Neutron-capture cross sections for a radioactive ^<185>W nucleus(T_<1/2>=75 days) were evaluated at 30keV using the Hauser-Feshbach statistical model. Constraints on neutron density allowed in s-process models were provided.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report

Research Products

(43 results)

All Other

All Publications

  • [Publications] H.Utsunomiya, Y.Yonezawa 他: "Photodisintegration of ^9Be with laser-induced Compton backscattered γ rays"Physical Review C. 63. 018801 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, Y.Yonezawa 他: "Photodisintegration of ^9Be and the reaction rate for α(αn,γ)^9Be"Nuclear Physics A. 688. 340c-343c (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Sumiyoshi, H.Utsunomiya 他: "Astrophysical reaction rate for α(αn,γ)^9Be by photodisintegration"Nuclear Physics A. 709. 467-486 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Ohgaki, H.Toyokawa: "Parity measurements with completely polarized photon beam"Nuclear Science and Technology Supplement. 2. 500-503 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, H.Akimune 他: "Photoneutron cross sections for astrophysics"Nuclear Science and Technology Supplement. 2. 542-545 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, H.Akimune 他: "Cross section measurements of the ^<181>Ta(γ,n)^<180>Ta reaction near neutron threshold and the p-process nucleosynthesis"Physical Review C. 67. 015807 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, H.Akimune 他: "A new astrophysical γ probe and its applications"Nuclear Physics A. 718. 199c-206c (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Y.Hara, H.Utsunomiya 他: "Photodisintegration of deuterium and big bang nucleosynthesis"Physical Review D. 68. 072001 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] P.Mohr, T.Shizuma, ・・・, H.Utsunomiya: "s-process branching at ^<185>W revised"Physical Review C. 69. 032801(R) (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, M.S.Smith, T.Kajino: "Nuclear reactions in hot and explosive burning : A summary"Tours Symposium on Nuclear Physics IV (eds. M.Arnould et al., AIP Conf. Proc.)(New York, AIP). 561. 159-164 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, S.Goko 他: "Nuclear astrophysics experiments with laser-electron MeV photons"Int, Symp. Electromagnetic Interactions in Nuclear and Hadron Physics (eds. M.Fujiwara, T.Shima)(Singapore, World Scientific). 83-92 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, S.Goko 他: "Nuclear astrophysics experiments with a laser-electron photon beam"4^<th> Italy-Japam Symp. Perspectives in Heavy Ion Physics (eds. K.Yoshida, S.Kubono, I.Tanihata, C.Signorini)(Singapore, World Scientific). 286-297 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, H.Akimune 他: "The mass 9 system, ^9Be and ^9B : nuclear astrophysics and cluster physics"Int. Symp. Clustering Aspects of Quantum Many-Body Systems(eds. A.Ohnishi, N.Itagaki, Y.Kanada-Enyo, K.Kato)(Singapore, World Scientific). 151-158 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, Y.Yonezawa, H.Akimune, T.Yamagata, M.Ohta, M.Fujishiro, H.Toyokawa, H.Ohgaki: "Photodisintegration of ^9Be with laser-induced Compton backscattered γ rays"Phys.Rev.. C63. 018801 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya,.Y.Yonezawa, H.Akimune, T.Yamagata, M.Ohta, H.Toyokawa, H.Ohgaki, K.Sumiyoshi: "Photodisintegration of ^9Be and the reaction rate for α(αn,γ)^9Be"Nucl.Phys.. A688. 340c-343c (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Sumiyoshi, H.Utsunomiya, S.Goko, T.Kajino: "Astrophysical reaction rate for α(αn,γ)^9Be by Photodisintegration"Nucl.Phys.. A709. 467-486 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Ohgaki, H.Toyokawa: "Parity measurements with completely polarized photon beam"Nucl.Sci.Tech.. Su2. 500-503 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, H.Akimune, S.Goko, T.Yamagata, M.Ohta, H.Ohgaki, H.Toyokawa, K.Sumiyoshi, Y.-W.Lui: "Photoneutron cross sections for astrophysics"Nucl.Sci.Tech.. Su2. 542-545 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, H.Akimune, S.Goko, M.Ohta, H.Ueda, T.Yamagata, K.Yamasaki, H.Ohgaki, H.Toyokawa, Y.-W.Lui, T.Hayakawa, T.Shizuma, E.Khan, S.Goriely: "Cross section measurements of the ^<181>Ta(γ,n) ^<180>Ta reaction near neutron threshold and the p-process nucleosynthesis"Phys.Rev.. C67. 015807 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, H.Akimune, S.Goko, T.Hayakawa, Y.-W.Lui, H.Ohgaki, M.Ohta, T.Shizuma, H.Toyokawa, T.Yamasaki: "A new astrophysical y probe and its applications"Nucl.Phys.. A718. 199c-206c (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Y.Hara, H.Utsunomiya, S.Goko, H.Akimune, T.Yamagata, M.Ohta, H.Toyokawa, K.Kudo, A.Uritani, Y.Shibata, Y.-W.Lui, H.Ohgaki: "Photodisintegration of deuterium and big bang nucleosynthesis"Phys.Rev.. D68. 072001 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Mohr, T.Shizuma, H.Ueda, S.Goko, A.Makinaga, K.Y.Hara, T.Hayakawa, Y.-W.Lui, H.Ohgaki, H.Utsunomiya: "s-process branching at ^<185>W revised"Phys.Rev.. C69. 032801(R) (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, M.S.Smith, T.Kajino: "Nuclear reactions in hot and explosive burning : A summary"Tours Symposium on Nuclear Physics IV(eds. M.Arnould et al.) AIP Conf.Proc.(New York : AIP). 561. 159-164 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, S.Goko, H.Akimune, K.Yamasaki, T.Yamagata, M.Ohta, H.Ohgaki, H.Toyokawa, Y.-W.Lui, T.Hayakawa, T.Shizuma, K.Sumiyoshi, T.Kajino: "Nuclear astrophysics experiments with laser-electron MeV photons"Int.SymElectromagnetic Interactions in Nuclear and Hadron Physics(eds. M.Fujiwara and T.Shima)(Singapore, World Scientific). 83-92 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, S.Goko, H.Akimune, K.Yamasaki, T.Yamagata, M.Ohta, H.Ohgaki, H.Toyokawa, Y.-W.Lui, T.Hayakawa, T.Shizuma, H.Ohkuma, S.Okajima, K.Sumiyoshi, T.Kajino: "Nuclear astrophysics experiments with a laser-electron photon beam"4^<th> Italy-Japam SymPerspectives in Heavy Ion Physics(eds. K.Yoshida, S.Kubono, I.Tanihata, and C.Signerini)(Singapore, World Scientific). 286-297 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Utsunomiya, H.Akimune, K.Yamasaki, S.Goko, T.Yamagata, M.Ohta, M.Fujiwara, H.Fujimura, T Kawabata, K.Hara, M.Yosoi, T.Ishikawa, H.Ohgaki, H.Toyokawa: "The mass 9 system, ^9Be and ^9B : nuclear astrophysics and cluster physics"Int.Sym Clustering Aspects of Quantum Many-Body Systems(eds. A.Ohnishi, N.Itagaki, Y.Kanada-Enyo, and K. Kato)(Singapore, World Scientific). 151-158 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Y.Hara et al.: "Photodisintegration of deuterium and big bang nucleosynthesis"Physical Review D. 68. 072001 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Utsunomiya et al.: "A new astrophysical γprobe and its applications"Nuclear Physics A. 718. 199c-206c (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Shima et al.: "Photodisintegration cross section of ^3He and ^4He at low energies"Nuclear Physics A. 718. 23c-26c (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Ohgaki et al.: "Design studies of IR-FEL system at IAE, Kyoto University"Nucl.Instrum.Methods in Phys.Res.A. 507. 150-153 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Toyokawa et al.: "GAMMA-RAY COMPUTERIZED TOMOGRAPHY USING 10 MEV LASER-COMPTON PHOTON BEAM"Proceedings of the 2003 Particle Accelerator Conference. 713-715 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Utsunomiya: "Cross section measurements of the ^<181>Ta(γ,n) ^<180>Ta reaction near neutron threshold and the p-process nucleosynthesis"Phys. Rev. C. 67. 015807-1-015807-9 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] K.Sumiyoshi: "Astrophysical reaction rate for α(αn,γ) ^9Be by Photodisintegration"Nucl. Phys. A. 709. 467-486 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Utsunomiya: "Photoneutron Cross Section for Nuclear Astrophysics"J. Nucl. Science and Technology, Suppl.. 2. 542-545 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Ohgaki: "Parity Measurements with Completely Polarized Photon Beam"J. Nucl. Science and Technology, Suppl.. 2. 500-502 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Toyokawa: "Gamma-ray imaging with the Compton-backscattered laser photons"IEEE Trans. on Nucl. Science. 49. 182-187 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Toyokawa: "High-energy photon radiography system using laser-Compton scattering for inspection of bulk materials"Review do Scientific Instruments. 73. 3358-3362 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Y.Tokimoto: "Coulomb breakup of ^7Li for nuclear astrophysics"Physical Review C. 63. 035801-1-20 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Utsunomiya: "Photodisintegration of ^9Be with laser-induced Compton backscattered γ rays"Physical Review C. 63. 018801-1-4 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Akimune: "Evidence for a 3.8 MeV state in ^9B"Physical Review C. 64. 041305(R)-1-4 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Akimoto: "Non-uniform ^3He polarization formed by multiple collisions of fast ^3He^+ ion with polarized Rb vapor in strong magnetic field"Nuclear Instruments and Methods. B173. 370-382 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Nakayama: "Dipole excitation of α-cluster in ^6Li and ^7Li"Physical Review Letters. 87. 122502-1-4 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Yonehara: "Relaxation mechanism of optically pumped Rb vapor of high density in strong magnetic fields"Nuclear Instruments and Methods. B184. 391-405 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2002-03-31   Modified: 2016-04-21  

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