Measurement of anomalies in angular correlation of electron and positron internally produced in excited 8Be and 4He

Hugo Natal da Luz

Institute of Experimental and Applied Physics, CTU in Prague


Theoretical prediction for the distribution of the angle between electrons and positrons originating in internal pair creations is a monotonic featureless decrease with the opening angle. Recent studies on excited states of 8Be and 4He nuclei, made in ATOMKI, Hungary, however, revealed deviations from this expectation. If true, such a result may have a fundamental impact: the anomaly can be explained by introducing a new short-lived neutral boson that can still fit into known experimental and theoretical constraints. Although serious work has been done on the theoretical side, an independent laboratory has not yet verified these results, despite related experiments are being prepared worldwide. In this seminar we will present the GA ČR proposal submitted by the IEAP (CTU in Prague) and the FEE (University of West Bohemia in Pilsen) and recently accepted for funding.
We will describe the ongoing construction of a suitable Time Projection Chamber-based (TPC) spectrometer for light charged particles, utilizing magnetic field as a means for energy measurement and also Multiwire Proportional Chambers (MWPC) together with Timepix3 pixel detectors, for unprecedented spatial and angular resolution. The experimental effort will be operated at the Institute of Experimental and Applied Physics (IEAP) Van-de-Graaff accelerator facility in order to confirm or either refute the above-mentioned anomaly. Details of the detectors will be described, together with relevant technical theoretical and experimental aspects of the whole project.

Seminar takes place on Tuesday, February 23rd 2021 at 2:00 PM

Ing. Bartoloměj Biskup, Ph.D.
seminar organizer
doc. Ing. Ivan Štekl, CSc.
director of IEAP
doc. Dr. André Sopczak
IEEE CS - NPSS chair

IEEE Czechoslovakia section

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