Improvement of one-nucleon removal and total reaction cross sections in the Liège intranuclear-cascade model using Hartree-Fock-Bogoliubov calculations

Abstract

The prediction of one-nucleon-removal cross sections by the Liège intranuclear-cascade model has been improved using a refined description of the matter and energy densities in the nuclear surface. Hartree-FockBogoliubov calculations with the Skyrme interaction are used to obtain a more realistic description of the radial-density distributions of protons and neutrons, as well as the excitation-energy uncorrelation at the nuclear surface due to quantum effects and short-range correlations. The results are compared with experimental data covering a large range of nuclei, from carbon to uranium, and projectile kinetic energies. We find that the new approach is in good agreement with experimental data of one-nucleon-removal cross sections covering a broad range in nuclei and energies. The new ingredients also improve the description of total reaction cross sections induced by protons at low energies, the production cross sections of heaviest residues close to the projectile, and the triple-differential cross sections for one-proton removal. However, other observables such as quadruple-differential cross sections of coincident protons do not present any sizable sensitivity to the new approach. Finally, the model is also tested for light-ion-induced reactions. It is shown that the new parameters can give a reasonable description of the nucleus-nucleus total reaction cross sections at high energies.

Prominence of Pairing in Inclusive (p,2p) and (p,pnPaul1, Obertelli2, Bertulani3 et al. 2019Phys. Rev. Lett.7030View full textAdd to dashboardCite

“…A slight overestimation is found for proton removal though qualitatively the slope is reproduced. Good average agreement is found for neutron removal, consistent with the latest results from [68]. The INCL OES is shown for (p,2p) and (p,pn) in Fig.…”

“…To test our interpretation, the results were compared with semi-microscopic models recently used in the literature to describe inclusive nucleon removal cross sections. The latest version of the Liège Intranuclear Cascade Model (INCL) [13,68] describes hadron-nucleus reactions as a series of quasi-classical binary collisions in a static potential well, with proton and neutron radial distributions constrained by Hartree-Fock Bogoliubov calculations [69] using the Sly5 interaction [70]. After a certain timescale, the collisions are stopped and the excitation energy of the fragment is calculated based on the kinetic energy of remaining nucleons relative to the ground state of the remnant [71].…”

Strangeness production in the new version of the Liège intranuclear cascade model

“…[3], two main aspects were improved: the few nucleons removal channels, which are discussed in details in ref. [4,5] and the high energy part [6,7,9].…”

“…The Intra-Nuclear Cascade model of Liège (INCL), which was recognised by the IAEA benchmark in 2010 [1] as one of the best spallation models when combined to the ABLA07 [2] de-excitation code, has been considerably improved during the last decade. One can mention the light ion induced reactions [3], the improvements for few nucleons removal [4,5], and the extension to high energy [6,7]. The last point was motivated by various reasons.…”

Constraining the Λ -nucleus potential within the Liège intranuclear cascade model

“…[33]. For the Woods-Saxon density distribution the radius (R 0 ) and the diffuseness parameter (a) are taken from Hartree-Fock-Bogoliubov calculations since they provide a good description of single-nucleon knockout reactions [34]. The initial nucleon momenta are uniformly distributed in hard Fermi spheres of radii (2Z/A) 1/3 p F for protons and (2N/A) 1/3 p F for neutrons (see Ref.…”