High-accuracy Nuclear Spin Dependent Parity Violating Amplitudes in $^{133}$Cs
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arXiv
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866917750769713152 |
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| author | Chakraborty, A. Sahoo, B. K. |
| author_facet | Chakraborty, A. Sahoo, B. K. |
| contents | Relativistic coupled-cluster (RCC) theory at the singles and doubles approximation has been implemented to estimate nuclear spin dependent (NSD) parity violating (PV) electric dipole (E1) transition amplitudes ($E1_{PV}^{NSD}$) among hyperfine levels of the $6s ~^2S_{1/2} \rightarrow 7s ~^2S_{1/2}$ transition in $^{133}$Cs. To validate our calculations, we reproduce the Dirac-Hartree-Fock values and results from the combined coupled-Dirac-Hartree-Fock and random phase approximation (CPDF-RPA) method reported earlier. Contributions from the double-core-polarization (DCP) effects at the CPDF-RPA method were found to be between 3-12\% among different hyperfine levels. We derived a generalized expression for $E1_{PV}^{NSD}$, which helped incorporate both the NSD PV Hamiltonian and E1 operator simultaneously in the perturbative approach to account for the DCP contributions. The RCC method subsumes the CPDF-RPA and DCP effects in addition to contributions from the Brückner pair-correlations and normalization of the wave functions, and correlations among them. To improve accuracy of the $E1_{PV}^{NSD}$ amplitudes further, we replace the {\it ab initio} values of the E1 matrix elements and energies by their experimental values via a sum-over-states approach. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_19937 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | High-accuracy Nuclear Spin Dependent Parity Violating Amplitudes in $^{133}$Cs Chakraborty, A. Sahoo, B. K. Atomic Physics Nuclear Theory Relativistic coupled-cluster (RCC) theory at the singles and doubles approximation has been implemented to estimate nuclear spin dependent (NSD) parity violating (PV) electric dipole (E1) transition amplitudes ($E1_{PV}^{NSD}$) among hyperfine levels of the $6s ~^2S_{1/2} \rightarrow 7s ~^2S_{1/2}$ transition in $^{133}$Cs. To validate our calculations, we reproduce the Dirac-Hartree-Fock values and results from the combined coupled-Dirac-Hartree-Fock and random phase approximation (CPDF-RPA) method reported earlier. Contributions from the double-core-polarization (DCP) effects at the CPDF-RPA method were found to be between 3-12\% among different hyperfine levels. We derived a generalized expression for $E1_{PV}^{NSD}$, which helped incorporate both the NSD PV Hamiltonian and E1 operator simultaneously in the perturbative approach to account for the DCP contributions. The RCC method subsumes the CPDF-RPA and DCP effects in addition to contributions from the Brückner pair-correlations and normalization of the wave functions, and correlations among them. To improve accuracy of the $E1_{PV}^{NSD}$ amplitudes further, we replace the {\it ab initio} values of the E1 matrix elements and energies by their experimental values via a sum-over-states approach. |
| title | High-accuracy Nuclear Spin Dependent Parity Violating Amplitudes in $^{133}$Cs |
| topic | Atomic Physics Nuclear Theory |
| url | https://arxiv.org/abs/2405.19937 |