Proton-induced fission of181Ta at high excitation energies

Abstract

Total fission cross sections of 181 Ta induced by protons at different relativistic energies have been measured at GSI Darmstadt using the inverse kinematic technique. These data contribute to solve inconsistencies in previously reported measurements, but also help to benchmark state-of-the-art reaction codes. The energy range covered with these measurements allowed us to investigate the onset and temperature dependence of dissipative and transient effects at small deformation.

Dissipative effects in spallation-induced fission ofPb208at high excitation energies

“…We inferred from our model calculations an excitation energy threshold for the manifestation of transient effects of around 120 MeV for prefragments with Z 1 + Z 2 = 81, in good agreement with the result obtained in Ref. [21]. On the other hand, for Z 1 + Z 2 values lower than 81, where larger excitation energies are expected, time-dependent dynamical calculations better describe the measurements.…”

“…A detailed description of these codes applied to proton-induced fission of 181 Ta at high excitation energies and to fragmentation reactions with spherical radioactive nuclei can be found in Refs. [21] and [7], respectively. Here, we will only remind their main features.…”

“…Spallation [18][19][20][21] and fragmentation [6,7] reactions have also been used to study the dynamics of the fission process. Spallation reactions are usually described as a two-step process involving an intranuclear cascade and a subsequent evaporation stage [22].…”

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

“…The coupling of these model calculations has been benchmarked in several works about nucleon-induced reactions on different nuclei between carbon and uranium at incident energies from a few MeVs to 3 GeV, providing a satisfactory description of many observables such as isotopic distributions of evaporation and fission residues [20,21,41,[54][55][56][57][58][59], doubledifferential cross sections [2,21,41,42,60], total reaction and fission cross sections [2,41,42,[61][62][63], and pion production [2,44,64,65].…”

Isotopic production cross sections of residual nuclei in the spallation reactionXe136(200AMeV)+pParadela1, Tassan‐Got2, Benlliure3 et al. 2017Phys. Rev. CSelf Cite160160View full textAdd to dashboardCite

“…In particular, the isotopic production cross sections of final residual nuclei produced in spallation reactions were accurately determined at GSI, investigating these reactions in inverse kinematics by using a high-resolving power magnetic spectrometer. This technique made it possible to measure reactions induced by 238 U [5][6][7][8][9][10], 208 Pb [11][12][13][14], 197 Au [15][16][17], 136 Xe [18][19][20], and 56 Fe [21,22] projectiles on liquidhydrogen and liquid-deuterium targets at relativistic energies. These new data have contributed to improvement of the predictive power of model calculations describing spallation reactions.…”