Abstract
In an experiment at RIKEN, radioactive ions were implanted in the SIMBA silicon detector array and the β particles from the subsequent decay detected. However, as SIMBA is not capable of complete calorimetry, it is not possible to extract Qβ values directly from the data.Geant4 simulations have been used to determine the response of SIMBA to a given β -emission spectrum. By simulating with different β spectra and calculating the detector response to each spectrum, it is possible to compare with experiment and deduce the Qβ values.The technique is validated using two nuclei, for which the expected β spectrum is known from the literature.
Highlights
The experimentThe problem is that the β particles scatter and may even have enough energy to pass through the entire stack of detectors
In an experiment at RIKEN, radioactive ions were implanted in the Silicon IMplantation detector and Beta Absorber (SIMBA) silicon detector array and the β particles from the subsequent decay detected
The nuclei of interest were separated by BigRIPS [2] and implanted in the Silicon IMplantation detector and Beta Absorber (SIMBA) array [3]
Summary
The problem is that the β particles scatter and may even have enough energy to pass through the entire stack of detectors. In this case, not all the energy of the β particles is detected. It is necessary to determine the instrument response of SIMBA as a function of the β spectrum This means, that the β spectrum is calculated from the end-point energy and used as an input to the simulation. In order to take advantage of multithreading, Geant version 10 was used This code allows the user to provide an initial β spectrum and spatial distribution of the implantation area.
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