Isomeric yield ratios obtained via mass measurement techniques for studies of angular momentum generation in fission
Stephan Pomp1, S. Cannarozzo1, Z. Gao1, A. Al-Adili1, M. Lantz1, A. Solders1, the IGISOL/JYFLTRAP team2, and the FRS Ion Catcher collaboration3
1Uppsala University, Uppsala, Sweden
2University of Jyväskylä, Jyväskylä, Finland
3GSI, Darmstadt, Germany
One of the open problems...
We recently demonstrated a new experimental approach to precisely determine the gamma-ray intensities following the beta decay of long-lived fission products. For national-security applications, such as stockpile stewardship and nuclear forensics, one of the most straightforward and reliable ways to determine the number of fissions that occurred in a chain reaction is done via detection of the...
New experimental results on the dependence of mean γ-ray multiplicity on the total excitation energy of fission fragments are presented. The measurement setup consists of a twin-Frisch gridded ionization chamber (TFGIC) containing a $^{252}$Cf(sf) source, surrounded by a spherical array of 40 trans-stilbene scintillator detectors. Fragment properties are measured with the TFGIC using the...
A joint TUNL-LLNL-LANL collaboration was formed to measure absolute fission product yields from $^{235}$U, $^{238}$U, and $^{239}$Pu. Our goal is to study the energy evolution of fission products by using mono-energetic neutrons from 0.5 to 14.8 MeV [1] and mono-energetic photons from 8 to 15.5 MeV [2]. Measurements are conducted using the activation technique, where fission products are...
Independent Fission Product Yields (IFPY), i.e., yields of fission products right after the prompt neutron emission but before beta decay, are imperative for fundamental physics and nuclear applications. Currently, there is a significant deficiency in IFPY data for incident neutron energies in the MeV range, therefore, developing reliable tools and methods for the measurement of such critical...
