Activation cross section data of proton induced nuclear reactions on lanthanum in the 34–65 MeV energy range and application for production of medical radionuclides

Abstract

Activation cross sections of the nat La(p,x) 139,137m,137g,135,134,133m Ce, nat La(p,x) 135,134,133 La and 133m,133g,131 Ba nuclear reactions have been measured experimentally, for the first time (except 139 Ce). Cross-sections in the 34-64 MeV energy range were obtained through an activation method combining the stacked foil irradiation technique and gamma-ray spectrometry. The experimental cross sections were compared with the theoretical prediction in the TENDL-2014 and TENDL-2015, TALYS based libraries. Applications in the field of medical radionuclides production is discussed.

Measurement of 139La(p,x) cross sections from 35–60 MeV by stacked-target activation

“…These measurements were also compared to the work of Tárkányi et al, who performed a similar stacked target measurement on nat La in 2017 [30]. There were some discrepancies between the results of this work and the Tárkányi measurements, however there wasn't a clear systematic bias between one set of measurements and the other.…”

“…Therefore, the cross sections for the 139 La(p,x) 133m,g Ba reactions are reported in this work as independent. 30 The final cross section measured in the Lanthanum stack was in the 139 La(p,x) 135 La reaction, which has relatively weak γ emissions but was able to be identified using the 1.52%, 480.51 keV γ line. The uncertainties in this measurement were ≈30% because the EoB 135 La activities were small compared to the in-feeding from 135 Ce decay.…”

Investigating High-Energy Proton-Induced Reactions on Spherical Nuclei: Implications for the Pre-Equilibrium Exciton Model

“…The cross section data for 139 La(p,x) is more limited than what was available in the niobium case. These available eight channels only contain the three datasets of Tárkányi et al [69], Becker et al [3], and Morrell et al [6],…”

“…The total derived parameter changes for 139 La(p,x) are listed in Appendix D. The adjusted TALYS fits from this procedure are given in Figures 29-36 compared to the default calculation and EXFOR data for the eight used reaction channels [3,6,69]. Given that the experimental data does not extend beyond 100 MeV, the fits are shown only up to this point.…”

Activation cross-section measurement of proton induced reactions on cerium

“…In the framework of our systematic study of the production possibilities of standard and emerging therapeutic radioisotopes of lanthanides via charged particle induced reactions, we already investigated earlier the deuteron induced production routes of these radioisotopes on neodymium [8], on praseodymium [9], on cerium [10] and proton and deuteron induced reactions on lanthanum [11,12].…”