The Lorentz integral transform ( LIT) method has allowed to perform ab initio calculations of the response function of He-4,He-6, and Li-6,Li-7 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 He-4 case, where one has a 0(+) resonance close to the 3+1 thresholds. In fact, in inelastic electron scattering off He-4 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 non-energy 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.
Do light nuclei exhibit "collective" motions? / Leidemann, Winfried. - In: EPJ WEB OF CONFERENCES. - ISSN 2100-014X. - 66:(2014). (Intervento presentato al convegno International Nuclear Physics Conference (INPC) tenutosi a Firenze, ITALY nel JUN 02-07, 2013) [10.1051/epjconf/20146602062].
Do light nuclei exhibit "collective" motions?
Leidemann, Winfried
2014-01-01
Abstract
The Lorentz integral transform ( LIT) method has allowed to perform ab initio calculations of the response function of He-4,He-6, and Li-6,Li-7 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 He-4 case, where one has a 0(+) resonance close to the 3+1 thresholds. In fact, in inelastic electron scattering off He-4 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 non-energy 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.File | Dimensione | Formato | |
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