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

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.

submitted to Phys. Rev. C, revised manuscript

References in corpus (8)

• The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
• Complete electric dipole response and the neutron skin in 208Pb
• Random Matrices and Chaos in Nuclear Physics
• Analysis of possible systematic errors in the Oslo method
• Spin projection in the shell model Monte Carlo method and the spin distribution of nuclear level densities
• R-process nucleosynthesis calculations with complete nuclear physics input
• Fine structure of the isoscalar giant quadrupole resonance in 40Ca due to Landau damping?
• Complete inclusion of parity-dependent level densities in the statistical description of astrophysical reaction rates

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