High-precision calculation of the parity-nonconserving amplitude in francium
نویسنده
چکیده
A high-precision calculation of the 7s-8s parity-nonconserving ~PNC! transition amplitude in francium, based on a relativistic all-order method, is presented. Our values for the PNC amplitudes in Fr and Fr are EPNC515.41(17) and 14.02(15), respectively, in units 10 iueua0(2QW /N), where QW is the weak charge and N is the neutron number. Spin-dependent contributions to the PNC amplitude are calculated for Fr isotopes with nucleon numbers A5207, 209, 211, and 213. To assess the accuracy of our calculations, we apply the present all-order method to the 6s-7s PNC amplitude in cesium and obtain a result in close agreement with previous high-precision calculations.
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تاریخ انتشار 2000