Single-and double-spinflip prob.meas, and new isoscalar spin excitations

单自旋翻转和双自旋翻转概率测量以及新的等标量自旋激发

基本信息

批准号：
04402004
负责人：
SAKAI Hideyuki
金额：
$ 13.63万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04402004/
关键词：
Spinflip Probability Tensor Polarimeter Isoscalar Giant Resonance Double excited Giant Resonances Spin Collective Oscillations Polarization Transfer Experiments Spin Nuclear Physics 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

项目摘要

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 beam-time 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 single-and double-spinflip probabilities.It is shown that the single-spinflip probability is indeed large for the spin excitations and the double-spinflip probability is almost zero as expected for the present target and excitation energy range.Thus we conclude that our primary goal has been achieved.

Deuteron的内在旋转为1。因此，可以针对散射平面定义两个旋转的可能性，即deltas_y = 1,2。该项目的目的是搜索等式自旋巨型共振或获得有关等效相互作用（VSIGMA）的信息，该信息是通过测量这些单个（S_1）和double（s_2）-spinflip的可能性来鲜为人知的。可以通过矢量和张量极化的测量值来推断杜特龙散射的旋转概率，这就是一种被称为双散射方法。然而，测量张量极化的困难使我们长期以来推断出Spinflip概率。 We have, for the first time, designed and constructed the Deuteron POLarimeter(DPOL) which is capable to measure the vector and tensor polarizations simply.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 analysis POWersof DPOL.Owing to the accelerator beam-time allocation, we, unfortunately, could not get the polarized Deuteron横梁正如我们预期的那样。因此，完成该项目花了很长时间。在这些困难之后，我们首次成功测量了^<12> c（d，d，d，d'）^<12> c在e^d = 270 meV处的反应，以刺激能量范围，3 <e_x <25 meV和散射角度，2.5 <rheta <rheTa <rheTa <rheTa <rhreTa <rhreTa <7.5 <7.5 <7.5 <7.5> <7.5> <7.5> <7.5> <> <7.5> <7.5> <> <> <7.5> <可能的可能性表明，对于自旋兴奋而言，单旋转的概率确实很大，并且对于当前目标和兴奋能量范围的预期，双旋转概率几乎为零。