Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Structure and Dynamics of Nuclei V

HK 25.1: Gruppenbericht

Dienstag, 27. Februar 2018, 16:30–17:00, HZO 80

Investigation of Z-Yield Distributions of Fission Fragments using Calorimetric Low Temperature Detectors — •Santwana Dubey^1,2, Artur Echler^1,2, Peter Egelhof^1,2, Patrick Grabitz^1,2, Manfred Mutterer¹, Werner Lauterfeld², Aurelien Blanc³, Ulli Köster³, Saskia Kraft-Bermuth⁴, Pascal Scholz⁴, Shawn Bishop⁵, Jose Gomez⁵, and Friedrich Gönnenwein⁶ — ¹GSI Darmstadt, Germany — ²Univ. Mainz, Germany — ³ILL, Grenoble, France — ⁴Univ. Giessen, Germany — ⁵TU München, Germany — ⁶Univ. Tübingen, Germany

The investigation of isotopic yields of fission fragments is important for our understanding of fission process and for applications in reactor physics. The new concept of calorimetric low-temperature detectors (CLTDs) which provides fundamental advantages over ionization-mediated detectors was applied for the first time for the investigation of isotopic yields at the LOHENGRIN recoil separator, at the ILL Grenoble, using the degrader method. For ²³⁹Pu and ²⁴¹Pu targets, the present method allowed for the first time direct nuclear charge yield measurements in the mass region approaching symmetry (up to A=112 for ²⁴¹Pu and up to A=113 for ²³⁹Pu), and in the heavy mass region (A=128-137 for ²³⁹Pu ), where new data for masses inaccessible with gamma-spectroscopy could be obtained. Of particular interest was the behaviour of proton even-odd staggering in the transition region to symmetry which provides, insight in the fission mode. Furthermore, precise yields of ⁹²Rb and ⁹⁶Y for ²³⁵U, ²³⁹Pu and ²⁴¹Pu targets were determined, which are relevant for the reactor neutrino anomaly.