Do light nuclei exhibit “collective” motions?
1 Dipartimento di Fisica, Università di Trento, I-38123 Trento, Italy
2 Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Trento, I-38123 Trento, Italy
a e-mail: email@example.com
Published online: 20 March 2014
The Lorentz integral transform (LIT) method has allowed to perform ab initio calculations of the response function of 4,6He, and 6,7Li to the isoscalar monopole and isovector dipole operators in a wide range of energies. In this work we discuss some of these results and focus in particular on the 4He case, where one has a 0+ resonance close to the 3+1 thresholds. In fact, in inelastic electron scattering off 4He one finds a pronounced resonant structure in the isoscalar monopole strength. The knowledge of this strength as a function of energy makes possible calculations of the corresponding nonenergy weighted and energy-weighted sum rules. Comparing the sum rules with their contribution from the resonance region hints to the degree of collectivity of the resonant structure.
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