相对论轰击能量下旁观者碎裂的普适性
核实验
2009-10-30 v1
摘要
利用 SIS 上的 ALADIN 前向谱仪研究了能量介于 E/A = 400 MeV 与 1000 MeV 之间的 129Xe、197Au 和 238U 弹核与 Be、C、Al、Cu、In、Au 和 U 靶碰撞中的多重碎裂衰变。通过增加一组 84 个 Si-CsI(Tl) 望远镜,装置的立体角覆盖扩展至 \theta_lab = 16 degree。这使得弹核-旁观者源碎片的完整探测成为可能。该系统性数据集的主要特征是碎片段多重数与关联所遵循的 Z_bound 普适性。若以 Z_bound(即所有 Z_i \geq 2 的弹核碎片原子序数 Z_i 之和)为函数作图,这些观测量相对于入射道不变。未观察到对轰击能量或靶质量的显著依赖。碎片段多重数对弹核质量的依赖遵循线性标度律。在现有数据范围内并通过模型研究探讨了所观测到的旁观者碎裂普适性的原因与限度。研究发现,该普适性质应持续至远高于本工作所探能量的轰击能量,且与核内级联和统计多重碎裂模型所展现的普适特征一致。PACS 编号:25.70.Mn、25.70.Pq、25.75.-q
引用
@article{arxiv.nucl-ex/9606001,
title = {Universality of Spectator Fragmentation at Relativistic Bombarding Energies},
author = {A. Schuettauf and W. D. Kunze and A. Woerner and M. Begemann-Blaich and Th. Blaich and D. R. Bowman and R. J. Charity and A. Cosmo and A. Ferrero and C. K. Gelbke and C. Gross and W. C. Hsi and J. Hubele and G. Imme and I. Iori and P. Kreutz and G. J. Kunde and V. Lindenstruth and M. A. Lisa and W. G. Lynch and U. Lynen and M. Mang and T. Moehlenkamp and A. Moroni and W. F. J. Mueller and M. Neumann and B. Ocker and C. A. Ogilvie and G. F. Peaslee and J. Pochodzalla and G. Raciti and Th. Rubehn and H. Sann and C. Schwarz and W. Seidel and V. Serfling and L. G. Sobotka and J. Stroth and L. Stuttge and S. Tomasevic and W. Trautmann and A. Trzcinski and M. B. Tsang and A. Tucholski and G. Verde and C. W. Williams and E. Zude and B. Zwieglinski},
journal= {arXiv preprint arXiv:nucl-ex/9606001},
year = {2009}
}
备注
Plain Tex, 49 pages including 20 eps figures. Also available from http://www-kp3.gsi.de/www/kp3/aladin_publications.html