Knockout and fragmentation reactions using a broad range of tin isotopes

Abstract

Production cross sections of residual nuclei obtained by knockout and fragmentation reactions of different tin isotopes accelerated at 1A GeV have been measured with the fragment separator (FRS) at GSI, Darmstadt. The new measurements are used to investigate the neutron-excess dependence of the neutron-and proton-knockout cross sections. These cross sections are compared to Glauber model calculations coupled to a nuclear deexcitation code in order to investigate the role of the remnant excitations. This benchmarking shows an overestimation of the cross sections for the removal of deeply bound nucleons. A phenomenological increase in the excitation energy induced in the remnants produced in these cases allows us to reproduce the measured cross sections.

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

“…The (p,pn) cross sections do not manifest any obvious dependencies on S n of the daughter nucleus as observed for the proton removal cross sections, nor A, N, or Z. The typical measured cross sections of ∼ 50 mb are consistent with published values from light C, N, O [66,67], and from Sn isotopes [15]. Though the neutron removal probability is expected to increase with N along an isotopic chain, S n decreases with A reducing the number of available bound states in the daughter.…”

“…One-nucleon knockout reactions are a tool of choice for spectroscopic studies, and exclusive cross sections between individual excited states may characterize the overlap between the initial and final wavefunctions [8,9]. Despite the pervasiveness of these methods, the relevant quantities that drive single nucleon removal cross sections are still actively studied [10][11][12][13][14][15].…”

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

“…The results presented in this work, together with the possibility of using this model in GEANT4 simulations [94], will facilitate the design of new experiments in different facilities, such as GSI/FAIR [59,95,96] and RIKEN [97,98], where kinematically complete measurements of quasifree knockout reactions of a broad range of nuclei impinging on hydrogen targets are proposed to investigate nuclear structure. Future benchmarks of INCL could be performed using experimental data from those experiments in order to provide more knowledge on this reaction.…”

Systematic reduction of the proton-removal cross section in neutron-rich medium-mass nuclei

“…This difference has also been observed in nucleon-removal cross sections obtained with stable medium-mass and heavy nuclei (e.g. 112,124 Sn [19], 136 Xe [20], 197 Au [21], 208 Pb [22] and 238 U [23])), and with few unstable mediummass nuclei (e.g. 132 Sn [24], 90 Sr [25], 137 Cs [25]).…”