Reconciliation of Theoretical Lifetimes of the 5s5p^(3)P_(2)^(o) Metastable State for ^(88)Sr with Measurement: The Role of the Blackbody-Radiation-Induced Decay  

作　　者：Benquan Lu Xiaotong Lu Jiguang Li Hong Chang 卢本全;卢晓同;李冀光;常宏(National Time Service Center,Chinese Academy of Sciences,Xi'an 710600,China;Institute of Applied Physics and Computational Mathematics,Beijing 100088,China;The University of Chinese Academy of Sciences,Beijing 100088,China)

机构地区：[1]National Time Service Center,Chinese Academy of Sciences,Xi'an 710600,China [2]Institute of Applied Physics and Computational Mathematics,Beijing 100088,China [3]The University of Chinese Academy of Sciences,Beijing 100088,China

出　　处：《Chinese Physics Letters》2022年第7期41-46,共6页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11874090, 91536106, 61127901, 11404025, and U1530142);the Strategic Priority Research Program of CAS (Grant No. XDB21030100);the Key Research Project of Frontier Science of CAS (Grant No. QYZDB-SSW-JSC004);the West Light Foundation of CAS (Grant No. XAB2018B17)。

摘　　要：We conducted measurement and calculation to resolve the long-standing large discrepancy in the metastable state lifetime for the ^(88)Sr atom between theoretical and experimental results. The present lifetime τ = 830_(-240)^(+600)s,measured using the magneto-optical trap as a photon amplifier to detect the weak decay events, is approximately60% larger than the previous experimental value τ = 520_(-140)^(+310)s. By considering the electron correlation effects in the framework of the multiconfiguration Dirac–Hartree–Fock theory, we obtained a theoretical lifetime of 1079(54) s, which lies in the range of measurements with error bars. Furthermore, we considered the higher-order electron correlation and Breit interaction to control the uncertainty of the theoretical calculation. The significant improvement in the agreement between calculations and measurements is attributed to the updated blackbody radiation-induced decay rate.

关 键 词：Dirac The Role of the Blackbody-Radiation-Induced Decay Sr with Measurement Reconciliation of Theoretical Lifetimes of the 5s5p^(3)P_(2)^(o)Metastable State for 

分 类 号：O571.3[理学—粒子物理与原子核物理]