• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Study of Spin-Isospin Excitation in Nuclei by the (n, p) Reaction with Monochromatic Neutrons

Research Project

Project/Area Number 01540228
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 核・宇宙線・素粒子
Research InstitutionTohoku University

Principal Investigator

ORIHARA Hikonojo  Cyclotron and Radioisotope Center, Professor, サイクロトロン・ラジオアイソトープセンター, 教授 (00004432)

Co-Investigator(Kenkyū-buntansha) NAKAGAWA Takemi  Faculty of Science, Department of Physics, Assistant, 理学部, 助手 (70004348)
ISHII Keoizo  Cyclotron and Radioisotope Center, Assistant Professor, サイクロトロン・ラジオアイソトープセンター, 助教授 (00134065)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1990: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1989: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsCharge Exchange Reaction / (n, p) Reaction / Spin Isospin Excitation / Neutron Induced Reaction / Neutron Time-of-Flight / Neutron Scattering / (n,P)反応 / 中性子誘導核反応 / 中性子飛行時間測定法 / 単色中性子ビ-ム / 原子核のスピン・アイソスピン励起 / β^+-崩壊
Research Abstract

The purposes of this research are (1) development of monochromatic neutron beams, being capable for the studies in nuclear spectroscopy and reaction dynamics in the En - 40 MeV region, and (2) study of spin-isospin excitation by the (n, p) reaction in nuclei, instead of the so far investigated (p, n) reaction. In order to realize such a difficult research with seconderly beams, emitted charged particles have been analyzed by a magnetic spectrometers equipped with a detector array, constructed in the present work. Also developed are data-taking and analyzing soft-wares.
We purchased isotonically enriched ^<6, 7>Li metal for the neutron production targets. The properties of neutron beams were tested using the neutron time-of-flight facilities located in Cyclotron and Radioisotope Center. With the neutron-beam production system including target, neutron collimator and beam stopper, we have obtained a neutron beam with its intensity of 5 x 10^<-6> /muA/sr, and with resolution of less than 7 … More 00keV. (ref. 1) We have carried out the neutron scattering experiments in the course of this project. The 7Li target was bombarded by 37-MeV proton beams to produce 35-MeV neutron beams. Elastically and inelastically scattered neutrons by ^<28>Si were analyzed by the time-of-flight system. The angular distribution of scattering cross-section have been analyzed by the optical-model to investigate the core-polarization effects in the nuclear mean fields. (ref. 2) With the feasibility study of the (n, p) reaction, our final aim of this research is to study ^<12>C(n, p)^<12>B and ^<26>Mg(n, p)^<26>Na reactions. We have obtained preliminary results for the ^<12>C(n, p)^<12>B reaction. For the latter, however, we could not perform the experiment successfully, mainly due to its small cross-sections. A more intense proton beam of 100 muA is needed.
As a summary, we have constructed a monoenergetic fast-neutron facilities, which has sufficient specification for a neutron scattering experiment, though it needs more intense primary beams for the (n, p) reaction for heavier nuclei. Less

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] T.Niizeki et al.,新関 隆,他: "FACILITIES FOR NEUTRON INDUCED EXPERIMENTS AT THE TOHOKU UNIUERSITY CYCLOTRON" Nucleas Intrumeues cud Methodes ir Pluysics Reseaskh A. 4287. 455-459 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Niizeki, H. Orihara, et al.: "Facilities for neutron induced experiment at Tohoku University cyclotron" Nuclear Instruments and Methods in Physics Research. A287. 455-459 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 新関 隆(T.Niizeki): "FACILITIES FOR NEUTRON INDUCED EXPERIMENTS AT THE TOHOKU UNIVERSITY CYCLOTRON" Nuclear Iustruments and Methodes in Physics Research A. A287. 455-459 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 新関隆: "Facilities for Neutron Induced Experiments at the Tohoku University Cyclotron" Nuclear Instruments at Methods. A287. 455-459 (1990)

    • Related Report
      1989 Annual Research Report

URL: 

Published: 1989-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi