Bright interior of nuclei viewed by α particles: High order eikonal expansion

Abstract

The possibility of observing a bright interior in the nucleus ''viewed'' by intermediate energy alpha particles (E ␣ ϭ172.5 MeV͒, as a probe for the 58 Ni nucleus, previously predicted by applying only a first-order noneikonal correction and one simple optical model potential was confirmed. The first-, second-, and third-order noneikonal corrections to the Glauber model were incorporated in three arbitrary different nominal optical potentials and the effects of switching ͑off/on͒ the Coulomb potential were studied. The role of corrections in the effective potentials and also the results of calculations of the imaginary part of the phase shift functions for the different optical potentials used were discussed. ͓S0556-2813͑97͒01107-2͔

New Properties of Nuclei: Signals from Kaons, Quarks And α ‐ Scattering

“…We have showed, using the higher-order NE corrections of Wallace, that the simple picture of the optical model (where it is assumed that the imaginary part of the potential is responsible for the absorption process and its shape should not be affected by the real part) is no longer valid since the effective imaginary part is rather a complicated function of both the real and imaginary parts of the nominal used optical potential. Moreover, it was confirmed the possibility of observing a bright interior in the nucleus due to the drastic decrease found in the imaginary part of the "effective" optical potential in the central region of the nucleus where the mean free path of α -particle becomes more larger than in the surface domain [4]. An independent unbiased calculations using three different "effective" phenomenological, in addition to another fourth microscopical (systematic single-folding potential using realistic density dependent Michigan version of the in-medium nucleon-nucleon interaction (BDM3Y1) [5]) optical potentials corrected by higher-order Wallace NE terms, were applied to study the interaction of IE α -particles (E α = 172.5, 340 MeV) with the medium-mass target 58Ni.…”

“…12q [4] The charge form factors for the four lightest nuclei were calculated adding in a simple manner the 6q-, 9q-, and 12q-components to the usual nuclear wave function. The relativistic harmonic oscillator wave functions were used in the multiquark admixtures to estimate the respective form factors and the interference terms between the nucleonic and multiquark channels.…”