Measurement of neutron total cross-sections of 209Bi at the Pohang Neutron Facility

TL;DR

This study measured neutron total cross-sections of natural bismuth from 0.1 eV to 100 eV using time-of-flight at the Pohang Neutron Facility, providing data for nuclear data libraries.

Contribution

First comprehensive measurement of neutron total cross-sections of 209Bi in the specified energy range at Pohang, with comparison to evaluated and previous data.

Findings

Results agree with ENDF/B VII.1 data

New experimental data extend existing cross-section measurements

Enhanced understanding of neutron interactions with bismuth

Abstract

Measurements of neutron total cross-sections of natural bismuth in the neutron energy region from 0.1 eV to 100 eV have been performed by using the time-of-flight method at the Pohang Neutron Facility, which consists of an electron linear accelerator, a water-cooled tantalum target with a water moderator, and a 12-m-long time-of-flight path. A 6Li-ZnS(Ag) scintillator with a diameter of 12.5 cm and a thickness of 1.6 cm is employed as a neutron detector, and a piece of high purity natural bismuth metallic plates with a thickness of 3 mm is used for the neutron transmission measurement. The present results were compared with the evaluated data from ENDF/B VII.1 and other previous reported experimental data.