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dc.contributor.authorSur, C-
dc.contributor.authorChaudhuri, R. K-
dc.contributor.authorDas, B. P-
dc.contributor.authorMukherjee, D-
dc.identifier.citationJournal of Physics B: Atomic, Molecular, and Optical Physics, Vol. 38, No. 23, pp. 4185 - 4194en
dc.descriptionRestricted Access-
dc.description.abstractThe magnetic dipole and electric quadrupole hyperfine constants of Aluminium (27/supAl) atom are computed using the relativistic coupled cluster (CC) and unitary coupled cluster (UCC) methods. Effects of electron correlations are investigated using different levels of CC approximations and truncation schemes. The ionization potentials, excitation energies, transition probabilities, oscillator strengths and nuclear quadrupole moment are computed to assess the accuracy of these schemes. The nuclear quadrupole moment obtained from the present CC and UCC calculations in the singles and doubles approximations are 142.5 mbarn and 141.5 mbarn, respectively. The discrepancies between our calculated IPs and EEs and their measured values are better than 0.3%. The other one-electron properties reported here are also in excellent agreement with the measurements.en
dc.publisherInstitute of Physicsen
dc.subjectMagnetic Dipoleen
dc.subjectElectric Quadrupole Hyperfineen
dc.subjectRelativistic Coupled Clusteren
dc.subjectUnitary Coupled Cluster (UCC) Methodsen
dc.subjectIonization Potentialsen
dc.subjectOscillator Strengthsen
dc.subjectNuclear Quadrupole Momenten
dc.titleComparative studies using coupled-cluster and unitary coupled-cluster methods: nuclear quadrupole moment, hyperfine constants and transition properties of 27Alen
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