Speaker
Description
Nuclear $\beta$-decay is a simple and selective approach to populate excited states and obtain precise spectroscopic information. If the imbalance between proton and neutron number is large, levels in the daughter nucleus can be populated above the proton (or $\alpha$) separation energy, leading to single or multi-particle emission. These decay channels provide an opportunity to study nuclear structure at high excitation energy [1], correlation of multi-particle emission, nuclear astrophysics processes [2] and fundamental symmetries.
Detecting the particles emitted after $\beta$-decay with a high efficiency becomes necessary to obtain the full decay path information. The Regina Cube for Multiple Particles (RCMP), a new ancillary detector for the GRIFFIN HPGe $\gamma$-ray spectrometer at TRIUMF [3], was developed in this context, to explore $\beta$-decay at the proton drip line. RCMP is a set of six double-sided silicon strip detectors (DSSD) arranged in a cubic geometry, allowing to measure the energy of charged particles emitted after $\beta$-decay. Added to GRIFFIN, this state-of-the-art setup is the most efficient to date in order to perform this type of study.
RCMP was commissioned at TRIUMF-ISAC, where beams of $^{20}$Mg and $^{21}$Mg were produced with the highest statistical yield measured to date. Corrections such as energy add-back, cross-talk and energy loss have to be taken into account to retrieve the correct physical quantities. This work presents a study of these correction factors and how they affect the obtained results for $^{21}$Mg $\beta$-delayed proton emission. My co-worker, Sydney Plante, will continue by presenting the analysis of the $^{20}$Mg $\beta$-delayed spectroscopy.
[1] M.V. Lund et al. "Systematic trends in beta-delayed particle emitting nuclei: The case of $\beta$p$\alpha$ emission from $^{21}$Mg" Phys. Lett. B 750 (2015)
[2] M.V. Lund et al. "Beta-delayed proton emission from $^{20}$Mg" Eur. Phys. J. A 52.10 (2016)
[3] A.B. Garnsworthy et al. "The GRIFFIN facility for Decay-Spectroscopy studies at TRIUMF-ISAC" Nucl. Instrum. Methods Phys. Res., Sect. A 918 (2019)