Research in medium enrgy nuclear structure with electron scattering.

Research Project

Project/Area Number	63044058
Research Category	Grant-in-Aid for Overseas Scientific Survey.
Allocation Type	Single-year Grants
Section	Joint Research
Research Institution	Shizuoka University
Principal Investigator	HOTTA Akio Shizuoka University, 教養部, 教授 (00022111)
Co-Investigator(Kenkyū-buntansha)	J. Dubach マサチューセッツ大学, 大学院核物理, 助教授 G.A Peterson マサチューセッツ大学, 大学院核物理, 正教授 MATSUYAMA Akihiko Shizuoka University, 教養部, 助教授 (90190545) SUZUKI Toshio Nihon University, 文理学部, 助手 (70139070) TAMAE Tadaaki Tohoku University, 理学部, 助手 (10124174) PETERSON G.A. University of Massachusetts, U.S.A. DUBACH J. University of Massachusetts, U.S.A.
Project Period (FY)	1988 – 1989
Project Status	Completed (Fiscal Year 1989)
Budget Amount *help	¥6,000,000 (Direct Cost: ¥6,000,000) Fiscal Year 1989: ¥3,000,000 (Direct Cost: ¥3,000,000) Fiscal Year 1988: ¥3,000,000 (Direct Cost: ¥3,000,000)
Keywords	Core-polarization effect / Meson-exchange currents / Relativistic effects in nuclei / Electron scattering / Transverse form factors / Freedom of quark and nucleon in nuclei / High momentum transfer / Medium energy nuclear physics
Research Abstract	1. At MIT-Bates Lab.; Transverse elastic and inelastic form factors for low-lying levels in ^<117>Sn in the momentum transfer range q= 1.2-2.4 fm^<-1>, and the ^<41>Ca elastic magnetic form factors in the q range from 0.9 to 2.0 fm^<-1>, have been measured by 180ﾟ electron scattering. The quenching from the predictions of the extreme single -particle model has been observed for both ^<117>Sn and ^<41>Ca. The first order core-polarization effects and meson exchange current(MEC) corrections have been investigated comparing the new data. 2. At SLAC Stanford University; The cross sections for 180ﾟ deuteron electrodisintegration have been measured near threshold for Q^2-range 1.21 to 2.77 (GeV/C)^2. Nonrelativistic calculations based on both meson-nucleon and hybrid quark-hadron models are not in quantitative agreement with the new data. The necessity of relativistic model is pointed out.