IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Microscopic model to nucleon spectra in hypernuclear non-mesonic weak decay
Autor/es:
BAUER, E
Revista:
NUCLEAR PHYSICS A
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2013 vol. 914 p. 204 - 208
ISSN:
0375-9474
Resumen:
A consistent microscopic model is applied to the calculation of thenucleon emission spectra in the non--mesonic weak decay of $Lambda$--hypernuclei.We adopt a nuclear matter formalism extended to finite nuclei via the localdensity approximation, a one--meson exchange weak transition potential and a Bonnnucleon--nucleon strong potential. Ground state correlations and final stateinteraction, at second order in the nucleon--nucleon interaction, are introduced onthe same footing for all the isospin channels of one-- and two--nucleon induceddecays. Double--coincidence nucleon spectra are predicted for $^{12}_Lambda$C andcompared with recent KEK data. Discrepancies with data remain for protonemission and for both neutron-proton and neutron-neutronemission in the non?back?to?back kinematics region.Motivated by a recent triple--coincidence measurement by FINUDA, we estimate the three--bodyinduced decay, where we have found, $Gamma_{3}/Gamma_{2} cong 0.23$.Our microscopic model alsopredicts values for the asymmetry parameter in $^{12}_{Lambda}$C, consistent withthe asymmetry measured at KEK.