Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
https://doi.org/10.1016/j.nima.2022.167858Get rights and content
Abstract In this work we describe the ongoing construction of a Time Projection Chamber-based (TPC) spectrometer for light charged particles utilising magnetic field as a means for energy measurement, combining Multi Wire Proportional Chambers (MWPC) with Timepix3 pixel detectors for improved spatial and angular resolution. The spectrometer will be operated at the Institute of Experimental and Applied Physics (IEAP) Van-de-Graaff facility with the goal of verifying the so-called ATOMKI anomaly (deviation in the distribution of the opening angle between electrons and positrons originating in internal pair creations – IPC – in the decay of 8Be and 4He excited nuclei). Description of the detectors is provided along with a few results.
Introduction Recent studies reported a 6.8-
anomaly in the distribution of the opening angle of ee pairs produced in a Be transition [1], and identified a similar behaviour in the decay of He [2]. These results have prompted the interest of the scientific community. The reported effect can be related with unidentified nuclear reactions, experimental effects, or even the production of a new boson, which has been put forward by several theoreticians [3] but that no other experiment has observed so far.
In order to provide an independent assessment of the anomaly, the Institute of Experimental and Applied Physics (IEAP) at the Czech Technical University in Prague is developing a dedicated experiment. To check the anomaly we plan to use our Van de Graaff accelerator, where a proton beam will induce the needed
Be and He excited states (using Li or H, respectively, as fixed targets).
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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
https://doi.org/10.1016/j.nima.2022.167858Get rights and content
Abstract
In this work we describe the ongoing construction of a Time Projection Chamber-based (TPC) spectrometer for light charged particles utilising magnetic field as a means for energy measurement, combining Multi Wire Proportional Chambers (MWPC) with Timepix3 pixel detectors for improved spatial and angular resolution. The spectrometer will be operated at the Institute of Experimental and Applied Physics (IEAP) Van-de-Graaff facility with the goal of verifying the so-called ATOMKI anomaly (deviation in the distribution of the opening angle between electrons and positrons originating in internal pair creations – IPC – in the decay of 8Be and 4He excited nuclei). Description of the detectors is provided along with a few results.
Introduction
Recent studies reported a 6.8-
anomaly in the distribution of the opening angle of ee pairs produced in a Be transition [1], and identified a similar behaviour in the decay of
He [2]. These results have prompted the interest of the scientific community. The reported effect can be related with unidentified nuclear reactions, experimental effects, or even the production of a new boson, which has been put forward by several theoreticians [3] but that no other experiment has observed so far.
In order to provide an independent assessment of the anomaly, the Institute of Experimental and Applied Physics (IEAP) at the Czech Technical University in Prague is developing a dedicated experiment. To check the anomaly we plan to use our Van de Graaff accelerator, where a proton beam will induce the needed
Be and He excited states (using Li or
H, respectively, as fixed targets).
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