Project/Area Number  04402004 
Research Category 
GrantinAid for Scientific Research (A).

Research Field 
核・宇宙線・素粒子

Research Institution  The University of Tokyo 
Principal Investigator 
SAKAI Hideyuki Graduate School of Science, The University of Tokyo Professor, 大学院・理学系研究科, 教授 (90030030)

CoInvestigator(Kenkyūbuntansha) 
SUZUKI Toru Tokyo Metropolitan Univ., Facul.of Science, Asso.Prof., 理学部, 助教授 (20175409)
OKAMURA Hiroyuki ICEPP,The University of Tokyo Research Associate, 素粒子物理国際研究センター, 助手 (10221144)

Project Fiscal Year 
1992 – 1995

Project Status 
Completed(Fiscal Year 1995)

Budget Amount *help 
¥21,300,000 (Direct Cost : ¥21,300,000)
Fiscal Year 1995 : ¥1,500,000 (Direct Cost : ¥1,500,000)
Fiscal Year 1994 : ¥1,500,000 (Direct Cost : ¥1,500,000)
Fiscal Year 1993 : ¥7,800,000 (Direct Cost : ¥7,800,000)
Fiscal Year 1992 : ¥10,500,000 (Direct Cost : ¥10,500,000)

Keywords  Spinflip Probability / Tensor Polarimeter / Isoscalar Giant Resonance / Double excited Giant Resonances / Spin Collective Oscillations / Polarization Transfer Experiments / Spin Nuclear Physics / スピン反転確率 / テンソル偏極度計 / 荷電スカラー巨大共鳴 / 二重巨大共鳴 / スピン集団運動 / 偏極移行 / 電荷スカラー巨大共鳴 / 荷電スカー巨大共鳴 / マルチワイヤードリフトチェンバー 
Research Abstract 
The deuteron has an intrinsic spin of 1. Therefore two spinflip probabilities, DELTAs_y=1,2, can be defined with respect to the scattering plane. The aims of this project are to search for an isoscalar spin giant resonance or to obtain information on the isoscalar effective interaction(Vsigma)which is poorly known, by measuring these single(S_1) and double(S_2)spinflip probabilities. The spinflip probability for the deuteron scattering can be deduced by the vector and tensor polarization measurements for the inelastically scattered deuterons, so called a double scattering method. However the difficulty to measure the tensor polarization prevented us to deduce the spinflip probability for long time. We have, for the first time, designed and constructed the Deuteron POLarimeter(DPOL)which is capable to measure the vector and tensor polarizations simultaneously. We had to establish the reaction or scattering which is adequate for the purpose of polarization analysis.Based on such results we improved the DPOL and subsequently measured the effective analyzing POWersof DPOL.Owing to the accelerator beamtime allocation, we, unfortunately, could not get the polarized deuteron beams as we had expected. And thus it took so long time to complete this project. Overcoming these difficulties we succeeded, for the first time, to measure the double scattering for the ^<12>C(d, d')^<12>C reaction at E^d=270 MeV for a wide excitation energy range, 3<E_x<25 MeV,and a scattering angle range, 2.5ﾟ <rheta_<lab><7.5ﾟ and to deduce the singleand doublespinflip probabilities.It is shown that the singlespinflip probability is indeed large for the spin excitations and the doublespinflip probability is almost zero as expected for the present target and excitation energy range. Thus we conclude that our primary goal has been achieved.
