Neutron capture cross section of unstable 63Ni: implications for stellar nucleosynthesis.
Neutron capture cross section of unstable 63Ni: implications for stellar nucleosynthesis.
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DOI：
10.1103/physrevlett.110.022501
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发表时间：
2013-01
影响因子：
8.6
通讯作者：
C. Lederer;C. Massimi;S. Altstadt;J. Andrzejewski;L. Audouin;M. Barbagallo;V. Bécares;F. Bečvář
中科院分区：
文献类型：
--
作者：
C. Lederer;C. Massimi;S. Altstadt;J. Andrzejewski;L. Audouin;M. Barbagallo;V. Bécares;F. Bečvář
在欧洲核子研究中心的中子飞行时间装置n_TOF上首次测量了能量高达200 keV的热中子的~（63）Ni（n，γ）截面。总共确定了12个（新）共振的捕获核。麦克斯韦平均截面计算的热能从kT=5-100 keV的不确定性约20%。恒星模型计算的25兆星星表明，新的数据有显着的影响，在大质量恒星的s-过程生产的63铜，64镍，和64锌，允许更强的约束铜产量从爆炸核合成在随后的超新星。
The 63Ni(n,γ) cross section has been measured for the first time at the neutron time-of-flight facility n_TOF at CERN from thermal neutron energies up to 200 keV. In total, capture kernels of 12 (new) resonances were determined. Maxwellian averaged cross sections were calculated for thermal energies from kT=5-100 keV with uncertainties around 20%. Stellar model calculations for a 25M⊙ star show that the new data have a significant effect on the s-process production of 63Cu, 64Ni, and 64Zn in massive stars, allowing stronger constraints on the Cu yields from explosive nucleosynthesis in the subsequent supernova.