Measurement of the bound-state beta decay of 205Tl(81+): intermediate and result data

The data presented here is the intermediate and result data from the measurement of the bound-state beta decay of 205Tl(81+), experiment G-20-0E121, which was performed at the Experimental Storage Ring (ESR) at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt (Germany) in the frame of FAIR Phase-0. The experimental measurement was done from the 26th March 2020 to 6th April 2020. Intermediate Data: During the experiment, the ESR monitored the beam via three main detectors: the non-destructive 245 MHz Schottky resonator, the DC Current Transformer (DCCT), and a Multi-Wire Proportional Chamber (MWPC). In particular: Schottky data: the integrated Schottky noise power density for the 205Tl(81+) peak and the 205Pb(82+) peak is provided for each storage measurement. The full Schottky spectrum can be made available on request. As described in the related works below, the Schottky data became saturated above a certain threshold due to a mismatched amplifier in the NTCAP DAQ. This results in non-exponential decay of Schottky peaks for high intensities. DCCT data: the entire beam current in the ring was monitored using the DCCT. The DCCT was recorded using a scalar counter and thus has a non-zero offset value, which we determined to be 28.199 µA from a period with no beam. The DCCT is intended to be used as a diagnostic tool, and is not as precise as other, purpose-built detectors. MWPC data: for most storage measurements, a MWPC detector was placed downstream of the gas target on the outside of the ring to detect electron recombination products. The provided data is the detection rate on the anode. The gas target density, as recorder by a scaler counter, is also included. The intermediate data on all three of these detectors plus the gas target density is provided in the tar.gz repository, with individual ROOT files for each storage time. The ROOT files have the naming format "Storage time_MMDD_HH.root". Each file contains 5 TGraph objects. Result Data: The result data provides all the necessary individual measurement and correction values to extract a bound-state beta-decay rate from the corrected ratios. It is provided in two forms: BSBD_205Tl-result_data.ods is an ODS table for easy visualisation. BSBD_205Tl-final_vals.txt is a text file used by the Monte Carlo analysis script provided in [DOI 10.5281/zenodo.11560338](https://doi.org/10.5281/zenodo.11560338). The "Ratio" column is the corrected 205Pb/205Tl decay ratio for each storage, following Equation (1) of Leckenby et al. (2024) Nature, ..... 1 sigma error bars, both including and not-including the estimated contamination variation, are provided. Please refer to the related works below or contact the authors for more details.

Leckenby, G., Sidhu, R. S., Chen, R. J., Bai, M., Blaum, K., Brandau, C., Dickel, T., Dillmann, I., Dmytriiev, D., Faestermann, T., Forstner, O., Franczak, B., Giessel, H., Gernhäuser, R., Glorius, J., Griffin, C., Gumberidze, A., Haettner, E., Hillenbrand, P.-M., … Zhao, J. (2024). Measurement of the bound-state beta decay of 205Tl(81+): intermediate and result data (1.0) [Data set]. GSI Helmholtzzentrum für Schwerionenforschung GmbH. https://doi.org/10.5281/zenodo.11556665