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Coupled-cluster calculations for valence systems around O-16 | | J.R. Gour
; P. Piecuch
; M. Hjorth-Jensen
; M. Wloch
; D.J. Dean
; | | Date: |
21 Jul 2005 | | Subject: | nucl-th | | Affiliation: | MSU), P. Piecuch (MSU), M. Hjorth-Jensen (Oslo), M. Wloch (MSU), and D.J. Dean (ORNL | | Abstract: | We study the ground and low-lying excited states of O-15, O-17, N-15, and F-17 using modern two-body nucleon-nucleon interactions and the suitably designed variants of the ab initio equation-of-motion coupled-cluster theory aimed at an accurate description of systems with valence particles and holes. A number of properties of O-15, O-17, N-15, and F-17, including ways the energies of ground and excited states of valence systems around O-16 change as functions of the number of nucleons, are correctly reproduced by the equation-of-motion coupled-cluster calculations. Within a harmonic oscillator basis and large effective model spaces, our results are converged for the chosen two-body Hamiltonians. Thus, all disagreements with experiment are, most likely, due to the degrees of freedom such as three-body interactions not accounted for in our effective two-body Hamiltonians. In particular, the calculated binding energies of O-15/N-15 and O-17/F-17 enable us to rationalize the discrepancy between the experimental and recently published [Phys. Rev. Lett. 94, 212501 (2005)] equation-of-motion coupled-cluster excitation energies for the Jpi=3- state of O-16. The results demonstrate the feasibility of the equation-of-motion coupled-cluster methods to deal with valence systems around closed-shell nuclei and to provide precise results for systems beyond A=16. | | Source: | arXiv, nucl-th/0507049 | | Services: | Forum | Review | PDF | Favorites | |
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