Speaker
Prof.
Peter Egelhof
(GSI Darmstadt)
Description
Precise data on fission-fragment yield distributions in terms of mass, nuclear charge, and kinetic energy are of great interest for a better understanding of the fission process. Precise isotopic yields for 92Rb and 96Y, in particular, are important for the investigation of reactor antineutrino oscillations and the study of the reactor antineutrino anomaly [1]
In a recent experiment, performed at the research reactor at ILL Grenoble, the new concept of calorimetric low-temperature detectors, which is based on the collection of phonons and is thus comprising basic advantage over conventional ionization-mediated detectors with respect to detector performance [2], was applied for the first time for the investigation of Z-yield distributions of fission fragments. Fragments from thermal neutron induced fission were mass-separated with the LOHENGRIN separator, and then, after passing through silicon-nitride degrader foils, detected in an array of calorimetric low-temperature detectors. Considerable improvement in Z-resolving power was achieved as compared to previous measurements conventionally with ionization chambers, what has allowed to reach the region of mass symmetry and to approach the heavy fragment mass region, both being not fully explored before.
The new experimental technique will be briefly discussed, and an overview on data obtained for thermal neutron induced fission of 235U, 239Pu and 241Pu targets in the mass range 82 < A < 139 will be presented which may contribute to a better understanding of the fission process. In particular, for A = 92 and A = 96 new precise values for the isotopic yields for 92Rb and 96Y for all three measured fission reactions were obtained, which may lead to a better interpretation of the reactor antineutrino anomaly [1].
[1] A. A. Sonzogni et al., Phys. Rev. C91 (2015) 011301
[2] P. Egelhof and S. Kraft-Bermuth in Cryogenic Particle Detection, Topics Appl. Phys. 99, 469-500 (2005), Springer-Verlag Berlin Heidelberg
Primary author
Ms
Santwana Dubey
(University Mainz)
Co-authors
Dr
Artur Echler
(GSI Darmstadt)
Dr
Aurelian Blanc
(ILL Grenoble, France)
Prof.
Friedrich Goennenwein
(University Tübingen, Germany)
Dr
Jose Gomez
(Technical University München, Germany)
Dr
Manfred Mutterer
(GSI Darmstadt)
Mr
Pascal Scholz
(University Giessen, Germany)
Mr
Patrick Grabitz
(University Mainz)
Prof.
Peter Egelhof
(GSI Darmstadt)
Dr
Saskia Kraft-Bermuth
(University Giessen)
Prof.
Shawn Bishop
(Technical University München, Germany)
Mr
Stefan Stolte
(University Mainz)
Prof.
Ulli Koester
(ILL Grenoble; France)
Mr
Werner Lauterfeld
(University Mainz)
