Analysis of 1+ Excitations in 16O with Polarized Proton Inelastic Scattering Reaction

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Weinvestigate the 1+ excitations in 16O nucleus within shell model. There are at least three excitations 1+ observed in (p, γ), (e, e´) and (p, p´) reactions at energies 16.22, 17.14 and 18.79 MeV. It is needed to include in valence space at least 0p1/2 and 0d5/2 shells in spherical shell model to produce such excitations. Wemade shell model calculations for different valence spaces. Also different Hamiltonians were used. Excitations in nuclei are characterized by spin and current transition densities which are different for different levels. Inelastic electron scattering excites both but inelastic proton scattering at zero degree excites mainly spin degrees of freedom. Comparing these two types of level excitation it is possible to deduce the role of spin and current degrees of freedom in every excitation. Unfortunately, the accuracy of this method is not too high. In this workwe study the influence of the type of excitation (spin or orbital) on the characteristics of the polarization of the inelastically scattered protons, viz., on the probability of spin-flip SNN. Weinverstigate the angular dependence of the value of this probability on the type of the excitation.

作者简介

M. Onegin

NRC “Kurchatov Institute” – PNPI

编辑信件的主要联系方式.
Email: onegin_ms@pnpi.nrcki.ru
Gatchina, Russia

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