8,774 research outputs found
{\it Ab initio} studies of electron correlation effects in the atomic parity violating amplitudes in Cs and Fr
We have studied the correlation effects in Cs and Fr arising from the
interplay of the residual Coulomb interaction to all orders and the neutral
weak interaction which gives rise to the parity violating electric dipole
transition to first order, within the framework of the relativistic
coupled-cluster theory which circumvents the constrain of explicitly summing
over the intermediate states. We observe that, the contributions arising from
the perturbed doubly excited states are quite significant and hence, any
calculation should not be considered accurate unless it includes the perturbed
double excitations comprehensively. In this article, we have reported a
comparative study of various results related to the parity violation in Cs and
Fr.Comment: 8 pages, 3 tables, 3 figure
Nuclear quadrupole moment of 43Ca and hyperfine structure studies of its singly charged ion
By combining our theoretical calculation and recently measured electric
quadrupole hyperfine structure constant of the state in the
singly ionized Ca, we determine its nuclear quadrupole moment to one
percent accuracy. The obtained result, , is about ten percent
improvement over the considered standard value. We have employed the
relativistic coupled-cluster theory at single and double excitations level to
calculate the electronic wave functions. The accuracy of these wave functions
are estimated by comparing our calculated magnetic dipole hyperfine constants
with their corresponding available experimental results of many low-lying
states. We also present hyperfine structure constants for other higher excited
states where experimental results are not reported. Role of the Breit
interaction has been investigated in these properties.Comment: 7 pages, 7 table
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