New experimental measurement of natSe(n, g) cross section between 1 eV to 1 keV at the CSNS Back-n facility

Abstract

The data related to the article "New experimental measurement of natSe(n, γ) cross sections between 1 eV to 1 keV at the CSNS Back-n facility" published in the journal Chinese Physics B. 74Se is one of 35 p-nuclei, and 82Se is a r-only nucleus, and their (n,γ) cross section are vital input parameters for nuclear astrophysics reaction network calculations. The neutron capture cross section in the resonance range of isotopes and even natural selenium samples has not been measured. Prompt γ-rays originating from neutron-induced capture events were detected by four C6D6 liquid scintillator detectors at the Back-n facility of China spallation neutron source (CSNS). The pulse height weighting technique (PHWT) was used to analyze the data in the 1 eV to 100 keV region. The deduced neutron capture cross section was compared with ENDF/B-VIII.0, JEFF-3.2, and JENDL-4.0, and some differences were found. Resonance parameters were extracted by the R-Matrix code SAMMY in the 1 eV - 1 keV region. It contains 2 text files, which are described below：1) natSe_CS_data.txt: The experimental data of natSe(n, γ) cross sections between 1eV and 100 keV.2) R_matrix_par.txt: resonance parameters of natSe extracted by R-matrix from experimental data.