Eur. Phys. J. A (2016) 52: 345
https://doi.org/10.1140/epja/i2016-16345-1

Regular Article - Experimental Physics

Measurement of fission cross-section for the ²³²Th(n,f )¹⁴¹Ba reaction induced by neutrons around 14 MeV

¹ School of Nuclear Science and Technology, Lanzhou University, 730000, Lanzhou, Gansu Province, China
² Institute of Nuclear Physics and Chemistry, Chinese Academy of Engineering Physics, 621900, Mianyang, Sichuan Province, China
³ Engineering Research Center for Neutron Application, Ministry of Education, Lanzhou University, 730000, Lanzhou, Gansu Province, China

^* e-mail: lanchl@lzu.edu.cn

Received: 24 July 2016
Accepted: 31 October 2016
Published online: 24 November 2016

Abstract

The fission cross-section of the ²³²Th(n,f)¹⁴¹Ba reaction induced by neutrons around 14MeV was measured precisely with the neutron activation and off-line gamma-ray spectrometric technique. Neutron fluence was monitored on-line using the accompanying -particles from the ³H(²H,n)⁴He reaction, whereas the neutron energies were measured by the method of cross-section ratios of ⁹⁰Zr(n,2n)⁸⁹Zr to ⁹³Nb(n,2n)^92mNb reactions. The experimentally determined ²³²Th(n,f)¹⁴¹Ba reaction cross-sections were mb at MeV, 13.0±0.5 mb at MeV and 13.3±0.5 mb at MeV, respectively.