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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.

氘核的自旋是1。因此，可以根据散射平面定义两个自旋翻转概率，DELTAs_y=1,2。这个项目的目的是通过测量这些单（S_1）和双（S_2）自旋翻转概率来寻找一个等标量自旋巨共振或获得关于等标量有效相互作用（Vsigma）的信息，这是鲜为人知的。通过对非弹性散射氘核的矢量偏振和张量偏振测量，可以推导出氘核散射的自旋翻转概率，即双散射法。然而，由于测量张量极化的困难，长期以来我们无法推断自旋翻转概率。我们首次设计并制造了能够同时测量矢量偏振和张量偏振的氘核偏振计（DPOL）。我们必须建立足以用于极化分析的反应或散射。在此基础上对DPOL进行了改进，并对powersofdpol进行了有效的分析。由于加速器的束流时间分配问题，我们无法得到预期的偏振氘核束流。因此，完成这个项目花了很长时间。克服这些困难，我们首次成功地测量了^<12>C(d, d')^<12>C反应在E^d=270 MeV、激发能范围3<E_x<25 MeV、散射角范围2.5‰<rheta_<lab><7.5‰下的双散射，并推导了单次和双次自旋翻转概率。结果表明，在目前的目标和激发能范围内，自旋激发的单自旋翻转概率确实很大，双自旋翻转概率几乎为零。因此，我们得出结论，我们的主要目标已经实现。