Speaker
Description
The LLNL-LANL-TUNL collaboration has been providing high-quality fission product yields (FPYs) from neutron-induced fission of $^{235}$U, $^{238}$U, and $^{239}$Pu [1]. Fission products have been measured using activation technique with monoenergetic and pulsed neutron beam produced at the tandem accelerator at the Triangle Universities Nuclear Laboratory (TUNL). The previous campaign concentrated on measuring long-lived cumulative FPYs with half-lives of hours to days in order to study their dependence with incident neutron energy. In an effort to broaden our experimental FPY landscape, we extended these measurements to shorter-lived fission products using a recently installed RApid Belt-driven Irradiated Target Transfer System (RABITTS) at TUNL. This automated system allows cyclic neutron activation technique permitting the measurement of fission products with half-lives from minutes to seconds. Absolute yields have been determined for more than 40 fission products representing about 35 fission-product masses during the RABITTS activation. An overview of the RABITTS and preliminary data for neutron- induced fission of $^{235}$U and $^{238}$U at E$_n$=4.6 and 14.8 MeV will be presented.
[1] M. Gooden et al., Nucl. Data Sheets 131, 319 (2016).
This work was performed under the auspices of the U.S. Department of Energy Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344.