Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 25: Structure and Dynamics of Nuclei V
HK 25.1: Group Report
Tuesday, February 27, 2018, 16:30–17:00, HZO 80
Investigation of Z-Yield Distributions of Fission Fragments using Calorimetric Low Temperature Detectors — •Santwana Dubey1,2, Artur Echler1,2, Peter Egelhof1,2, Patrick Grabitz1,2, 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.