在每核子能量为800兆电子伏特的氖核碰撞中核集体流与带电π介子发射

Nuclear collective flow and charged-pion emission in Ne-nucleus collisions at E/A = 800 MeV.

作者信息

Gosset J, Valette O, Alard J P, Augerat J, Babinet R, Bastid N, Brochard F, De Marco N, Dupieux P, Fodor Z, Fraysse L, Gorodetzky P, Lemaire M C, L'Hôte D, Lucas B, Marroncle J, Montarou G, Parizet M J, Poitou J, Racca C, Rahmani A, Schimmerling W, Terrien Y

机构信息

Département de Physique Nucléaire, Centre d'Etudes Nucléaires de Saclay, Gif-sur-Yvette, France.

出版信息

Phys Rev Lett. 1989 Mar 13;62(11):1251-4. doi: 10.1103/PhysRevLett.62.1251.

DOI:10.1103/PhysRevLett.62.1251

PMID:10039622

Abstract

Triple-differential cross sections of charged pions were measured for collisions of Ne projectiles at E/A = 800 MeV with NaF, Nb, and Pb targets. The reaction plane was estimated event by event from the light-baryon momentum distribution. For heavy targets, preferential emission of charged pions away from the interaction zone towards the projectile side was observed in the transverse direction. Such a preferential emission, which is not predicted by cascade calculations, may be attributed to a stronger pion absorption by the heavier spectator remnant.

摘要

测量了能量为E/A = 800 MeV的氖弹与氟化钠、铌和铅靶碰撞时带电π介子的三重微分截面。通过轻重子动量分布逐事件估计反应平面。对于重靶，在横向观察到带电π介子从相互作用区向弹丸侧的优先发射。这种优先发射是级联计算所无法预测的，可能归因于较重旁观残余对π介子更强的吸收。