%0 Journal Article
%T Uncertainties of nucleo-chronometers from nuclear physics inputs<br>宇宙核时钟不确定度的研究
%A Zhang Wei-Hong
%A Niu Zhong-Ming
%A Wang Feng
%A Gong Xiao-Bo
%A Sun Bao-Hua
%A <br>张蔚泓
%A 牛中明
%A 王枫
%A 龚孝波
%A 孙保华
%J 物理学报
%D 2012
%I 
%X The influences of uncertainties in nuclear physics inputs on the Th/U, Th/Hf, Th/Eu, Th/Os, Th/Ir nucleo-chronometers are investigated in the framework of the classical r-process approach. A Monte-Carlo method is used to evaluate the age uncertainty originating from neutron separation energies for each nuclear mass model. It is found that the deduced age uncertainty for Th /U can be up to 1.66 Ga, and for the three chronometers, Th/Eu, Th/Os, Th/Ir, the uncertainties are 5.15 Ga, 3.93 Ga and 3.95 Ga, respectively. The recently proposed chronometer, Th/Hf, shows a clear model dependence, while Th/Os and Th/Ir chronometers tend to overestimate the age of Universe. Taking into account the uncertainties in nuclear physics inputs and observations, an up-to-date age estimation for the universe with the Th/U chronometer is 14.1? 3.8 Ga.
%K age of universe
%K nucleochronometer
%K rapid neutron-capture process
%K nuclear mass<br>宇宙年龄
%K 核时钟
%K 快中子俘获过程
%K 原子核质量
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=78F360FC29C479112AA3319F9CDCEA1F&yid=99E9153A83D4CB11&vid=1D0FA33DA02ABACD&iid=708DD6B15D2464E8&sid=321EE74DA2EB5AD9&eid=321EE74DA2EB5AD9&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=37