Level density of 2+ states in 40Ca from high energy-resolution (p,p') experiments

TL;DR

This study measures the level density of 2+ states in 40Ca using high-resolution (p,p') scattering data, applying fluctuation analysis and wavelet transforms, and compares results with theoretical models.

Contribution

It introduces a novel fluctuation analysis method combined with wavelet transforms to extract level densities from high-energy resolution scattering data.

Findings

Level density of 2+ states in 40Ca determined in the ISGQR region.

Quasi-free scattering background found to be minimal.

Experimental results compared with phenomenological and microscopic models.

Abstract

The level density of 2+ states in 40Ca has been extracted in the energy region of the isoscalar giant quadrupole resonance (ISGQR) from a fluctuation analysis of high energy-resolution p,p') data taken at incident energies of 200 MeV at the K600 magnetic spectrometer of iThemba LABS, South Africa. Quasi-free scattering cross sections were calculated to estimate their role as a background contribution to the spectra and found to be small. The shape of the background was determined from the discrete wavelet transform of the spectra using a biorthogonal wavelet function normalized at the lowest particle separation threshold. The experimental results are compared to widely used phenomenological and microscopic models.