The isoscalar monopole excitation of 4He is studied within a few-body ab initio approach. We consider the transition density to the low-lying and narrow 0+ resonance, as well as various sum rules and the strength energy distribution itself at dfferent momentum transfers q. Realistic nuclear forces of chiral and phenomenological nature are employed. Various indications for a collective breathing mode are found: i) the specific shape of the transition density, ii) the high degree of exhaustion of the non-energy-weighted sum rule at low q and iii) the complete dominance of the resonance peak in the excitation spectrum. For the incompressibility K of the alpha-particle values between 20 and 30 MeV are found.
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Titolo: | Examination of the first excited state of He 4 as a potential breathing mode |
Autori: | Bacca, S.; Barnea, N.; Leidemann, Winfried; Orlandini, Giuseppina |
Autori Unitn: | |
Titolo del periodico: | PHYSICAL REVIEW. C, NUCLEAR PHYSICS |
Anno di pubblicazione: | 2015 |
Numero e parte del fascicolo: | 2 |
Codice identificativo Scopus: | 2-s2.0-84922324496 |
Codice identificativo ISI: | WOS:000352020400002 |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevC.91.024303 |
Handle: | http://hdl.handle.net/11572/111745 |
Appare nelle tipologie: | 03.1 Articolo su rivista (Journal article) |
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File | Descrizione | Tipologia | Licenza | |
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2015_monopole_breathing.pdf | Versione editoriale (Publisher’s layout) | Tutti i diritti riservati (All rights reserved) | Open Access Visualizza/Apri |