1. Application of Calorimetric Low-Temperature Detectors for the Investigation of Z-Yield Distributions of Fission Fragments
- Author
-
Shawn Bishop, Friedrich Gönnenwein, A. Echler, Werner Lauterfeld, P. Egelhof, Manfred Mutterer, P. Grabitz, P. Scholz, Ulli Köster, S. Kraft-Bermuth, Santwana Dubey, Jose Gomez, Stefan Stolte, Aurelien Blanc, Institut Laue-Langevin (ILL), and ILL
- Subjects
Fission ,QC1-999 ,01 natural sciences ,Effective nuclear charge ,Nuclear physics ,chemistry.chemical_compound ,0103 physical sciences ,General Materials Science ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,Nuclear Experiment ,010306 general physics ,Physics ,Range (particle radiation) ,Spectrometer ,Fissile material ,010308 nuclear & particles physics ,Detector ,Bolometer for heavy ions ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Thermal neutron-induced fission ,Silicon nitride ,chemistry ,Yield (chemistry) ,Z-yield distributions - Abstract
In recent experiments, the new concept of calorimetric low-temperature detectors (CLTDs) was applied for the first time for the investigation of isotopic yields of fission fragments. Fragments from neutron-induced fission sources were mass-separated by the LOHENGRIN spectrometer at the ILL Grenoble and, after passing silicon nitride membranes used as degraders, detected in a CLTD array. The new detector concept of a thermal detector provides a fundamental advantage over conventional ionization-mediated detectors, in particular for heavier particle masses at low energies. Using fissile targets of235U,239Pu and241Pu, nuclear-charge separation was studied in the mass region 82 ≤ A ≤ 139. For light fragments, the Z resolution matches historically best values with conventional techniques, while for heavier masses substantial improvement was attained. We have gained first LOHENGRIN data on the isotopic yields in the light-mass group of241Pu. Towards mass-symmetry, known Z-yield data were supplemented in the range A = 110 to 113 for241Pu and239Pu. Extended data sets were cumulated for A = 92 and 96 due to a recent request from studies on the reactor anti-neutrino spectrum. Furthermore, considerable progress was achieved to extend isotopic yield measurements up to the heavy-mass region, hardly accessible until now.
- Published
- 2017
- Full Text
- View/download PDF