Valencia-Nantes-Surrey-Warsaw-Jyväskylä Collaboration
Nuclear structure and practical applications require nuclear data free from the Pandemonium
effect [1,2]. For both applications we need information on the Q value of the decay, the half-life
and the beta decay probabilities to the different levels in the daughter nucleus. Pandemonium,
in this context, means that the beta decay...
In this contribution we will present the study of beta decays of interest for reactor antineutrino
spectrum calculations using the Total absorption gamma-ray spectroscopy (TAGS). Measurements
of the beta decays of several fission fragments including 103,108Tc, 103,108Mo and 95,96Sr were done at
the Ion Guide Isotope Separator On-Line facility in Jyväskylä [1] using the Decay Total...
SUBATECH, CNRS/IN2P3, Nantes Université, IMT Atlantique, F-44307 Nantes, France
Contact: estienne@subatech.in2p3.fr
Key words: reactor antineutrinos, summation calculations, nuclear data, TAGS
Abstract: The accurate determination of reactor antineutrino spectra remains a very actual research topic for which interrogations have emerged in the past decade. Indeed, after the “reactor anomaly”...
Understanding the magnitude and detailed features of the highly precise IBD antineutrino spectra reported by the Daya Bay, NEOS, and RENO collaborations has been both a challenging and rewarding endeavor. Relative to the Huber–Mueller model, these spectra exhibit an overall ~5% excess in the predicted total yield—commonly referred to as the Reactor Antineutrino Anomaly (RAA)—as well as a...
Sensitive searches for new physics have motivated the exploration of new techniques for the
measurement of the beta-particle energy spectra. We describe here several experiments
which use a calorimetry technique with inorganic scintillating crystals along with implanted
radioactive beams to produce a 4pi geometry. We will discuss technical details
including major advantages but also current...
The international collaboration constituted based on the Total Absorption Gamma-ray
Spectroscopy technique (TAGS) in Europe is aiming to build a Total Absorption Spectrometer
(TAS) of the next generation. TAGS is a calorimetric technique using large monolithic or
segmented scintillators that cover more than 80% of 4p, but with limited energy resolution. It
complements high-resolution...
This work investigates the impact of the JEFF-4.0 fission yield evaluation, including associated uncertainties and covariance data on Fission Pulse Decay Heat (FPDH). Using thermal fission of ²³⁵U and ²³⁹Pu as case studies, uncertainty quantification is performed through a Monte Carlo approach based on random sampling of correlated fission yield datasets.
Calculations of Fission Pulse Decay...
A TUNL-LLNL-LANL collaboration has employed a rapid target transfer system to measure cumulative fission product yields (FPYs) following neutron-induced fission of $^{235}$U, $^{238}$U, and $^{239}$Pu at a neutron energy of 2.0 MeV. This work expands our previously published measurements of end-chain FPYs to include fission products up to four nuclides away from stability. The cyclic...
