基于螺旋度依赖截面的中子 $\eta$ 光生窄结构研究
核实验
2017-02-15 v1
摘要
测量了准自由质子和中子上 光生的双极化可观测量 以及螺旋度依赖截面 和 。美因茨 MAMI 加速器的 A2 实验所用的圆极化标记光子束与纵向极化的氘代丁醇靶相结合。Crystal Ball 和 TAPS 近乎 的探测器装置非常适合探测反冲核子以及 和 的衰变光子。结果表明，先前在中子 光生中观测到的窄结构仅出现在 中，因此很可能对应于自旋-1/2 振幅。在 产生中对该分波有贡献的核子共振只有 （）和 （）。此外，从 角分布提取的勒让德系数与近期反应模型预测吻合良好，该模型假设此结构的起源是 波中的窄共振。
引用
@article{arxiv.1702.01408,
title = {Insight into the narrow structure in {\boldmath{$\eta$}}-photoproduction on the neutron from helicity dependent cross sections},
author = {L. Witthauer and M. Dieterle and S. Abt and P. Achenbach and F. Afzal and Z. Ahmed and J. R. M. Annand and H. J. Arends and M. Bashkanov and R. Beck and M. Biroth and N. S. Borisov and A. Braghieri and W. J. Briscoe and F. Cividini and S. Costanza and C. Collicott and A. Denig and E. J. Downie and P. Drexler and M. I. Ferretti-Bondy and S. Gardner and S. Garni and D. I. Glazier and D. Glowa and W. Gradl and M. Günther and G. M. Gurevich and D. Hamilton and D. Hornidge and G. M. Huber and A. Käser and V. L. Kashevarov and S. Kay and I. Keshelashvili and R. Kondratiev and M. Korolija and B. Krusche and A. B. Lazarev and J. M. Linturi and V. Lisin and . Livingston and S. Lutterer and I. J. D. MacGregor and J. Mancell and D. M. Manley and P. P. Martel and V. Metag and W. Meyer and R. Miskimen and E. Mornacchi and A. Mushkarenkov and A. B. Neganov and A. Neiser and M. Oberle and M. Ostrick and P. B. Otte and D. Paudyal and P. Pedroni and A. Polonski and S. N. Prakhov and A. Rajabi and G. Reicherz and G. Ron and T. Rostomyan and A. Sarty and C. Sfienti and M. H. Sikora and V. Sokhoyan and K. Spieker and O. Steffen and I. I. Strakovsky and Th. Strub and I. Supek and A. Thiel and M. Thiel and A. Thomas and M. Unverzagt and Yu. A. Usov and S. Wagner and N. K. Walford and D. P. Watts and D. Werthmüller and J. Wettig and M. Wolfes and L. Zana},
journal= {arXiv preprint arXiv:1702.01408},
year = {2017}
}