来自 CERN n_TOF 设施的$^{58}$Ni 实验中子俘获数据
核实验
2014-02-06 v1
摘要
在 CERN 的中子飞行时间设施 n_TOF 上，测量了Ni 的截面，能量范围从 27 meV 到 400 keV。总共分析了高达 122 keV 的 51 个共振。计算了恒星温度 kT5-100 keV 下的麦克斯韦平均截面 (MACS)，不确定度小于 6%，显示出与高达 kT = 50 keV 的近期实验和评估数据有良好的一致性。本工作在 30 keV 提取的 MACS 为 34.20.61.8 mb，与最新结果和评估一致，但比近期的天体物理截面 KADoNIS 汇编低 12%。当将其纳入大质量恒星的 s-过程核合成模型时，这一变化导致Ni 的丰度增加 60%，而对更重同位素的传播影响可忽略不计。原因是，无论使用旧的还是新的 MACS，58Ni 都会通过中子俘获被有效耗尽。
引用
@article{arxiv.1402.1032,
title = {Experimental neutron capture data of $^{58}$Ni from the CERN n_TOF facility},
author = {TOF collaboration and P. Žugec and M. Barbagallo and N. Colonna and D. Bosnar and S. Altstadt and J. Andrzejewski and L. Audouin and V. Bécares and F. Bečvář and F. Belloni and E. Berthoumieux and J. Billowes and V. Boccone and M. Brugger and M. Calviani and F. Calviño and D. Cano-Ott and C. Carrapiço and F. Cerutti and E. Chiaveri and M. Chin and G. Cortés and M. A. Cortés-Giraldo and M. Diakaki and C. Domingo-Pardo and I. Duran and N. Dzysiuk and C. Eleftheriadis and A. Ferrari and K. Fraval and S. Ganesan and A. R. García and G. Giubrone and M. B. Gómez-Hornillos and I. F. Gonçalves and E. González-Romero and E. Griesmayer and C. Guerrero and F. Gunsing and P. Gurusamy and D. G. Jenkins and E. Jericha and Y. Kadi and F. Käppeler and D. Karadimos and P. Koehler and M. Kokkoris and M. Krtička and J. Kroll and C. Langer and C. Lederer and H. Leeb and L. S. Leong and R. Losito and A. Manousos and J. Marganiec and T. Martìnez and C. Massimi and P. F. Mastinu and M. Mastromarco and M. Meaze and E. Mendoza and A. Mengoni and P. M. Milazzo and F. Mingrone and M. Mirea and W. Mondalaers and C. Paradela and A. Pavlik and J. Perkowski and M. Pignatari and A. Plompen and J. Praena and J. M. Quesada and T. Rauscher and R. Reifarth and A. Riego and F. Roman and C. Rubbia and R. Sarmento and P. Schillebeeckx and S. Schmidt and G. Tagliente and J. L. Tain and D. Tarrío and L. Tassan-Got and A. Tsinganis and S. Valenta and G. Vannini and V. Variale and P. Vaz and A. Ventura and R. Versaci and M. J. Vermeulen and V. Vlachoudis and R. Vlastou and A. Wallner and T. Ware and M. Weigand and C. Weiß and T. Wright},
journal= {arXiv preprint arXiv:1402.1032},
year = {2014}
}
备注
10 pages, 8 figures, 5 tables