Examination of the first excited state of He 4 as a potential breathing mode

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.



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: 
Leidemann, Winfried
Orlandini, Giuseppina
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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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