Proton activation data file PADF-2. Targets with atomic numbers from 6 to 15

A new version of the Proton Activation Data File, PADF-2, has been prepared for targets from carbon to phosphorus. The file contains cross-sections of all protoninduced reactions occurring at primary energies up to 200 MeV. The new data were obtained using all available experimental data and results of calculations using modern nuclear models and up-to-date versions of computer codes. A preliminary version of the file can be downloaded at: https://t1p.de/3vzu

Arc-dpa and NRT displacement cross-sections for neutron irradiation of materials from Be to Bi calculated using JEFF-4T1, ENDF/B-VIII, JENDL-5, and TENDL-2021 data

Atomic displacement cross-sections for an advanced assessment of radiation damage rates were calculated for materials from Be to Bi using the arc-dpa model and NRT model, and data from JEFF-4T1 test library, the ENDF/B-VIII, JENDL-5, and TENDL-2021 libraries at neutron incident energies from 10-5 eV to the maximum available energy. Obtained cross-sections were extended to 200 MeV using TENDL-2021 data and earlier TENDL versions. Data prepared in ENDF/B and ACE format are available on the site https://bit.ly/3L8ZlH

Improved modelling of alpha-particle emission in nucleon induced reactions

This report discusses the phenomenological approach proposed to estimate the contribution of direct processes to the emission of α-particles in nucleon induced reactions. Using available measured energy distributions, the values of the parameters required for the calculations are obtained. The analysis was performed using the TALYS code

Impact of secondary particles on microdistribution of deposited dose in biological tissue in the presence of gold and gadolinium nanoparticles under photon beam irradiation

It is experimentally proven that nanoparticles of high-Z materials can be used as radiosensitizers for photon beam therapy. In the authors' opinion, data available as of today on the impact of secondary particles (electrons, photons and positrons generated in biological tissue by penetrating beam of primary photons) on the distribution of deposited dose during photon beam therapy in the presence of nanoparticles, are insufficient. Investigation of this impact constituted the main goal of this work. Two-stage simulation was performed using Geant4 platform. During the first stage a layer of biological tissue (water) was irradiated by monoenergetic photon sources with energies ranging from 10 keV to 6 MeV. As the result of this modeling spectra of electrons, photons and positrons were obtained at the depth of 5 cm. During the second stage the obtained photon spectra were used to irradiate gold, gadolinium and water nanoparticles. Radial distributions of energy deposited around nanoparticles were obtained as the result of this modeling. Radial DEF (Dose Enhancement Factor) values around nanoparticles of gold and gadolinium positioned in water at the depth of 5 cm were obtained after processing the collected data. Contributions from primary photons and secondary particles (electrons, photons and positrons generated in the layer of water with 5-cm thickness by the penetrating beam of primary photons) in the additional dose deposited around the nanoparticles were calculated as well. It was demonstrated that layer of biological tissue placed between the source of photons and nanoparticles considerably changes the initial spectrum of photons and this change is significant in the analysis of mechanism of radiosensitization of biological tissues by nanoparticles for all energies of photon sources (up to 6 MeV). It was established that interaction of electrons and positrons with nanoparticles does not lead to significant increase of additional dose in the vicinity of their surfaces and can be most likely excluded from consideration in the analysis of radiosensitization mechanism of nanoparticles

Tunable disorder in a crystal of cold polar molecules

In the present work, we demonstrate the possibility of controlling by an external field the dynamics of collective excitations (excitons) of molecules on an optical lattice. We show that a suitably chosen two-species mixture of ultracold polar molecules loaded on an optical lattice forms a phononless crystal, where exciton-impurity interactions can be controlled by applying an external electric field. This can be used for the controlled creation of many-body entangled states of ultracold molecules and the time-domain quantum simulation of disorder-induced localization and delocalization of quantum particles