DeGrush A, Maschinot A, Akdogan T, Alarcon R, Bertozzi W, Booth E, Botto T, Calarco J R, Clasie B, Crawford C, Dow K, Farkhondeh M, Fatemi R, Filoti O, Franklin W, Gao H, Geis E, Gilad S, Hasell D K, Karpius P, Kohl M, Kolster H, Lee T, Matthews J, McIlhany K, Meitanis N, Milner R, Rapaport J, Redwine R, Seely J, Shinozaki A, Sindile A, Širca S, Six E, Smith T, Tonguc B, Tschalär C, Tsentalovich E, Turchinetz W, Xiao Y, Xu W, Zhou Z-L, Ziskin V, Zwart T
Laboratory for Nuclear Science and Bates Linear Accelerator Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Arizona State University, Tempe, Arizona 85287, USA.
Phys Rev Lett. 2017 Nov 3;119(18):182501. doi: 10.1103/PhysRevLett.119.182501. Epub 2017 Oct 30.
We report the measurement of the beam-vector and tensor asymmetries A_{ed}^{V} and A_{d}^{T} in quasielastic (e[over →],e^{'}p) electrodisintegration of the deuteron at the MIT-Bates Linear Accelerator Center up to missing momentum of 500 MeV/c. Data were collected simultaneously over a momentum transfer range 0.1<Q^{2}<0.5 (GeV/c)^{2} with the Bates Large Acceptance Spectrometer Toroid using an internal deuterium gas target polarized sequentially in both vector and tensor states. The data are compared with calculations. The beam-vector asymmetry A_{ed}^{V} is found to be directly sensitive to the D-wave component of the deuteron and has a zero crossing at a missing momentum of about 320 MeV/c, as predicted. The tensor asymmetry A_{d}^{T} at large missing momentum is found to be dominated by the influence of the tensor force in the neutron-proton final-state interaction. The new data provide a strong constraint on theoretical models.
我们报告了在麻省理工学院 - 贝茨线性加速器中心对氘核进行的准弹性（(\vec{e})，(e^{'}p)）电致蜕变过程中，束流矢量不对称性(A_{ed}^{V})和张量不对称性(A_{d}^{T})的测量结果，测量范围高达500 MeV/c的缺失动量。使用贝茨大接受度谱仪环形探测器，在动量转移范围(0.1<Q^{2}<0.5\ (GeV/c)^{2})内，通过内部氘气靶同时收集数据，该靶在矢量和张量态下依次极化。将数据与计算结果进行了比较。发现束流矢量不对称性(A_{ed}^{V})对氘核的D波分量直接敏感，并且如预测的那样，在约320 MeV/c的缺失动量处有一个零点交叉。发现在大缺失动量下的张量不对称性(A_{d}^{T})主要受中子 - 质子末态相互作用中张量力的影响。新数据对理论模型提供了强有力的约束。
