Comment on “Pygmy dipole response of proton-rich argon nuclei in random-phase approximation and no-core shell model”

Paar, Nils (2008) Comment on “Pygmy dipole response of proton-rich argon nuclei in random-phase approximation and no-core shell model”. Physical Review C, 78 (3). pp. 39801-2. ISSN 0556-2813

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In a recent article by C. Barbieri, E. Caurier, K. Langanke, and G. Mart\'inez-Pinedo~\cite{;Bar.08};, low-energy dipole excitations were studied in proton-rich ${;32, 34}; Ar with random-phase approximation (RPA) and no-core shell model (NCSM) using correlated realistic nucleon-nucleon interactions obtained by the unitary correlation operator method (UCOM)~\cite{;Fel.98};. The main objective of this Comment is to argue that the article~\cite{;Bar.08}; contains an inconsistency with respect to previous study of excitations in the same UCOM-RPA framework using identical correlated Argonne V18 interaction~\cite{;Paa.06};, it does not provide any evidence that the low-lying state declared as pygmy dipole resonance in ${;32}; $Ar indeed has the resonance-like structure, and that prior to studying exotic modes of excitation away from the valley of stability one should ensure that the model provides reliable description of available experimental data on nuclear ground state properties and excitations in nuclei. Although the authors aimed at testing the UCOM based theory at the proton drip line, available experimental data that are used as standard initial tests of theory frameworks at the proton drip line have not been considered in the UCOM case (e.g., binding energies, one-proton separation energies, two-proton separation energies).

Item Type: Article
Keywords: proton drip line, excitations in nuclei, pygmy resonances, realistic nucleon-nucleon interactions
Date: September 2008
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2008) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: UKF 17/08, 119-1191005-1010
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 03 Jun 2014 11:44
Last Modified: 03 Jun 2014 11:44

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