Eur. Phys. J. A (2018) 54: 33
https://doi.org/10.1140/epja/i2018-12462-1

Letter

Production of Sn and Sb isotopes in high-energy neutron-induced fission of ^natU

¹ Uppsala University, BOX 516, 75120, Uppsala, Sweden
² University of Jyväskylä, P.O. Box 35 (YFL), 40014, Jyväskylä, Finland

^* e-mail: andrea.mattera@gmail.com

Received: 15 August 2017
Accepted: 15 January 2018
Published online: 5 March 2018

Abstract

The first systematic measurement of neutron-induced fission yields has been performed at the upgraded IGISOL-4 facility at the University of Jyväskylä, Finland. The fission products from high-energy neutron-induced fission of ^nat U were stopped in a gas cell filled with helium buffer gas, and were online separated with a dipole magnet. The isobars, with masses in the range A = 128-133 , were transported to a tape-implantation station and identified using -spectroscopy. We report here the relative cumulative isotopic yields of tin (Z = 50) and the relative independent isotopic yields of antimony (Z = 51) . Isomeric yield ratios were also obtained for five nuclides. The yields of tin show a staggered behaviour around A = 131 , not observed in the ENDF/B-VII.1 evaluation. The yields of antimony also contradict the trend from the evaluation, but are in agreement with a calculation performed using the GEF model that shows the yield increasing with mass in the range A = 128-133 .