Abstract
The isoscalar monopole excitation of is studied within a few-body ab initio approach. We consider the transition density to the low-lying and narrow resonance, as well as various sum rules and the strength energy distribution itself at different momentum transfers . 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 and (iii) the complete dominance of the resonance peak in the excitation spectrum. For the incompressibility of the particle, two different definitions give two rather small values (22 and 36 MeV).
- Received 17 March 2014
- Revised 5 January 2015
DOI:https://doi.org/10.1103/PhysRevC.91.024303
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