轻核-核碰撞中低质量电子对过剩的起源
核实验
2014-11-20 v1
摘要
我们报告了使用HADES谱仪在1.25 GeV/u能量下基本p+p和d+p反应中电子对产生的测量结果。首次通过探测氘核破裂产生的质子旁观者，重建了n+p反应中的电子对。我们发现，在n+p反应中，不变质量Me+e- > 0.15 GeV/c2的电子对产额比p+p反应大约高一个数量级。与模型计算的比较表明，其产生机制尚未得到充分描述。在C+C反应中测量的电子对谱与基本n+p和p+p碰撞的叠加兼容，在这种轻碰撞系统中几乎没有为额外的电子对源留下空间。
引用
@article{arxiv.0910.5875,
title = {Origin of the low-mass electron pair excess in light nucleus-nucleus collisions},
author = {The HADES Collaboration and G. Agakishiev and A. Balanda and D. Belver and A. V. Belyaev and A. Blanco and M. Böhmer and J. L. Boyard and P. Braun-Munzinger and P. Cabanelas and E. Castro and S. Chernenko and T. Christ and M. Destefanis and J. Díaz and F. Dohrmann and A. Dybczak and L. Fabbietti and O. V. Fateev and P. Finocchiaro and P. Fonte and J. Friese and I. Fröhlich and T. Galatyuk and J. A. Garzón and R. Gernhäuser and A. Gil and C. Gilardi and M. Golubeva and D. González-Díaz and F. Guber and T. Hennino and R. Holzmann and I. Iori and A. Ivashkin and M. Jurkovic and B. Kämpfer and T. Karavicheva and D. Kirschner and I. Koenig and W. Koenig and B. W. Kolb and R. Kotte and F. Krizek and R. Krücken and W. Kühn and A. Kugler and A. Kurepin and S. Lang and J. S. Lange and K. Lapidus and T. Liu and L. Lopes and M. Lorenz and L. Maier and A. Mangiarotti and J. Markert and V. Metag and B. Michalska and J. Michel and E. Morinière and J. Mousa and C. Müntz and L. Naumann and J. Otwinowski and Y. C. Pachmayer and M. Palka and Y. Parpottas and V. Pechenov and O. Pechenova and J. Pietraszko and W. Przygoda and B. Ramstein and A. Reshetin and A. Rustamov and A. Sadovsky and P. Salabura and A. Schmah and E. Schwab and Yu. G. Sobolev and S. Spataro and B. Spruck and H. Ströbele and J. Stroth and C. Sturm and M. Sudol and A. Tarantola and K. Teilab and P. Tlusty and M. Traxler and R. Trebacz and H. Tsertos and V. Wagner and M. Weber and M. Wisniowski and T. Wojcik and J. Wüstenfeld and S. Yurevich and Y. V. Zanevsky and P. Zhou},
journal= {arXiv preprint arXiv:0910.5875},
year = {2014}
}
备注
11 pages, 2 figures, \usepackage{epsfig}