Analytic response relativistic coupled-cluster theory: the first application to indium isotope shifts

Analytic response relativistic coupled-cluster theory: the first application to indium isotope shifts

With increasing demand for accurate calculation of isotope shifts of atomic systems for fundamental and nuclear structure research, an analytic energy derivative approach is presented in the relativistic coupled-cluster (CC) theory framework to determine the atomic field shift and mass shift (MS) fa...

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Bibliographic Details
Published in:New journal of physics 2020-01, Vol.22 (1), p.12001
Main Authors: Sahoo, B K, Vernon, A R, Garcia Ruiz, R F, Binnersley, C L, Billowes, J, Bissell, M L, Cocolios, T E, Farooq-Smith, G J, Flanagan, K T, Gins, W, de Groote, R P, Koszorús, Á, Neyens, G, Lynch, K M, Parnefjord-Gustafsson, F, Ricketts, C M, Wendt, K D A, Wilkins, S G, Yang, X F
Format: Article
Language:eng
Subjects:
analytic response
Atomic physics
Atomic properties
Atomic states
Clusters
coupled cluster
Indium
isotope shift
laser spectroscopy
Mathematical analysis
Nuclear structure
Relativism
Relativistic effects
Relativistic theory
specific mass shift
Theory
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Summary:With increasing demand for accurate calculation of isotope shifts of atomic systems for fundamental and nuclear structure research, an analytic energy derivative approach is presented in the relativistic coupled-cluster (CC) theory framework to determine the atomic field shift and mass shift (MS) factors. This approach allows the determination of expectation values of atomic operators, overcoming fundamental problems that are present in existing atomic physics methods, i.e. it satisfies the Hellmann-Feynman theorem, does not involve any non-terminating series, and is free from choice of any perturbative parameter. As a proof of concept, the developed analytic response relativistic CC theory has been applied to determine MS and field shift factors for different atomic states of indium. High-precision isotope-shift measurements of 104 − 127 In were performed in the 246.8 nm (5p 2P3/2 → 9s 2S1/2) and 246.0 nm (5p 2P1/2 → 8s 2S1/2) transitions to test our theoretical results. An excellent agreement between the theoretical and measured values is found, which is known to be challenging in multi-electron atoms. The calculated atomic factors allowed an accurate determination of the nuclear charge radii of the ground and isomeric states of the 104 − 127 In isotopes, providing an isotone-independent comparison of the absolute charge radii.
ISSN:1367-2630
1367-2630