宇宙核时钟不确定度的研究

张蔚泓; 牛中明; 王枫; 龚孝波; 孙保华

doi:10.7498/aps.61.112601

摘要

基于经典快过程理论模型, 研究了原子核物理输入量的不确定性对Th/U, Th/Hf, Th/Eu, Th/Os, Th/Ir等核时钟估算宇宙年龄的影响. 其中利用蒙特卡罗模拟方法, 计算了不同质量模型下由单中子分离能引起的不确定性.结果表明, Th/U核时钟由原子核质量不确定性引起的误差大约为1.66 Ga, 比其他核时钟小2 Ga以上.对 Th/Eu, Th/Os和Th/Ir核时钟, 该误差分别为5.15, 3.93和3.95 Ga.由于Th/Hf核时钟受质量模型影响太大, 而Th/Os和Th/Ir的计算结果又明显偏大, 因此在年龄计算中都需谨慎使用.综合考虑原子核物理输入量和天文观测带来的误差, 利用Th/U核时钟估算的宇宙年龄为14.1 3.8 Ga.

关键词:

Abstract

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.

Keywords:

作者及机构信息

1.
北京航空航天大学物理科学与核能工程学院, 软件开发环境国家重点实验室, 北京 100191;

2.
安徽大学物理与材料科学学院, 安徽 230039

基金项目: 北航大学生科研训练计划(SRTP)、软件开发环境国家重点实验室 (批准号: SKLSDE-2011ZX-18)、教育部新世纪优秀人才支持计划 (批准号: NCET-09-0031)、安徽大学211工程(批准号: 02303319) 和国家自然科学基金(批准号: 10975008, 11105010, 11035007, 11128510) 资助的课题.

Authors and contacts

1.
State Key Laboratory of Software Development Environment, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China;

2.
Department of Physics, Anhui University, Hefei 230039, China

Funds: Project supported by the Student Research Training Program of Beihang University, China, the Research Fund of State Key Laboratory of Software Development Environment, China (Grant No. SKLSDE-2011ZX-18), the Program for New Century Excellent Talents in University of Ministry of Education of China (Grant No. NCET-09-0031), the 211 Project of Anhui University, China (Grant No. 02303319), and the National Natural Science Foundation of China (Grant Nos. 10975008, 11105010, 11035007, 11128510).

参考文献

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施引文献

[1]	Komatsu E, Dunkley J, Nolta M R, Bennett C L, Gold B, Hinshaw G, Jarosik N, Larson D, Limon M, Page L, Spergel D N, Halpern M, Hill R S, Kogut A, Meyer S S, Tucker G S, Weiland J L, Wollack E, Wrightet E L 2009 Astrophys. J. Suppl. Ser. 180 330
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[3]	Burbidge E M, Burbidge G R, Fowler W A, Hoyle F 1957 Rev. Mod. Phys. 29 547
[4]	Cowan J J, Pfeiffer B, Kratz K L, Thielemann F K, Sneden C, Burles S, Tytler D, Beers T C 1999 Astrophys. J. 521 194
[5]
[6]	Niu Z M, Sun B H, Meng J 2009 Phys. Rev. C 80 065806
[7]
[8]	Meng J, Niu Z M, Liang H Z, Sun B H 2011 Sci. Chin. G 54 s119
[9]
[10]	Carretta E, Gratton R G, Clementini G, Pecci F F 2000 Astrophys. J. 533 215
[11]
[12]	Hansen B M S, Richer H B, Fahlman G G, Stetson P B, Brewer J, Currie T, Gibson B K, Ibata R, Rich R M, Shara M M 2004 Astrophys. J. Suppl. Ser. 155 551
[13]
[14]
[15]	Rutherford E 1929 Nature 123 313
[16]
[17]	Noddack I, Noddack W 1930 Naturwiss. 35 59
[18]	Fowler W A, Hoyle F 1960 Ann. Phys. 10 280
[19]
[20]
[21]	Butcher H R 1987 Nature 328 127
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[23]	Franois P, Spite M, Spite F 1993 Astron. Astrophys. 274 821
[24]
[25]	Cowan J J, Sneden C 2006 Nature 440 1151
[26]
[27]	Sneden C, McWilliam A, Preston G W, Cowan J J, Burris D L, Armosky B J 1996 Astrophys. J. 467 819
[28]	Westin J, Sneden C, Gustafsson B, Cowan J J 2000 Astrophys. J. 530 783
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[47]
[48]	Koura H, Tachibana T, Uno M, Yamada M 2005 Prog. Theor. Phys. 113 305
[49]
[50]	Goriely S, Chamel N, Pearson J M 2009 Phys. Rev. Lett. 102 152503
[51]
[52]	Geng L S, Toki H, Meng J 2005 Prog. Theor. Phys. 113 785
[53]
[54]	Kratz K L, Farouqi K, Pfeiffer B, Truran J W, Sneden C, Cowan J J 2007 Astrophys. J. 662 39
[55]
[56]	Sun B, Montes F, Geng L S, Geissel H, Litvinov Y A, Meng J 2008 Phys. Rev. C 78 025806
[57]
[58]
[59]	Sun B H, Meng J 2008 Chin. Phys. Lett. 25 2429
[60]
[61]	Mller P, Nix J R, Myers W D, Swiatecki W J 1995 At. Data Nucl. Data Tables 59 185
[62]
[63]	Pearson J M, Nayak R C, Goriely S 1996 Phys. Lett. B 387 455
[64]
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[66]
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[69]
[70]
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[72]	Otsuki K, Mathews G J, Kajino T 2003 New Astron. 8 767
[73]

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