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

Sonia Bacca, Nir Barnea, Winfried Leidemann, Giuseppina Orlandini

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The isoscalar monopole excitation of He4 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 different 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 α particle, two different definitions give two rather small values (22 and 36 MeV).

Original languageAmerican English
Article number024303
JournalPhysical Review C - Nuclear Physics
Issue number2
StatePublished - 5 Feb 2015

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© 2015 American Physical Society.


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