First results from the CARIBU facility: mass measurements on the r-process path.
First results from the CARIBU facility: mass measurements on the r-process path.
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DOI：
10.1103/physrevlett.111.061102
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发表时间：
2013-07
影响因子：
8.6
通讯作者：
J. V. Schelt;D. Lascar;G. Savard;J. Clark;P. Bertone;S. Caldwell;A. Chaudhuri;A. Levand;Gang Li;G. Morgan;R. Orford;R. Segel;K. Sharma;M. Sternberg
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文献类型：
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作者：
J. V. Schelt;D. Lascar;G. Savard;J. Clark;P. Bertone;S. Caldwell;A. Chaudhuri;A. Levand;Gang Li;G. Morgan;R. Orford;R. Segel;K. Sharma;M. Sternberg
加拿大彭宁阱质谱仪对阿贡国家实验室新加利福尼亚稀有同位素增殖器升级设施提供的33种富中子核素进行了质量测量。研究区包括132Sn双壳封闭区，Z范围从in到Cs， Sn同位素测量到A=135，典型测量精度在100 ppb以上。该区域包含了天体物理r过程的一个可能的主要等待点，并且通过一系列模拟显示了质量对r过程的影响。与常用的质量模型相比，这些首次在该等待点上具有直接质量信息的模拟显示，Sn和Sb的等待时间显着增加，这表明现有模型对于精确r过程计算的不足。
The Canadian Penning Trap mass spectrometer has made mass measurements of 33 neutron-rich nuclides provided by the new Californium Rare Isotope Breeder Upgrade facility at Argonne National Laboratory. The studied region includes the 132Sn double shell closure and ranges in Z from In to Cs, with Sn isotopes measured out to A=135, and the typical measurement precision is at the 100 ppb level or better. The region encompasses a possible major waiting point of the astrophysical r process, and the impact of the masses on the r process is shown through a series of simulations. These first-ever simulations with direct mass information on this waiting point show significant increases in waiting time at Sn and Sb in comparison with commonly used mass models, demonstrating the inadequacy of existing models for accurate r-process calculations.