Ponente
Descripción
Decay spectroscopy of the most exotic neutron-deficient nuclei can be effectively performed using a recoil separator coupled with a highly segmented silicon implantation detector positioned at its focal plane to study weakly produced products resulting from fusion-evaporation reactions. Sufficient pixelation enables the correlation of implantation events with their subsequent decay chains. Spatial and temporal correlation analysis is well-suited for decay chains involving alpha, proton or isomeric gamma-ray emissions due to their characteristic energies. Extending this method to include states that decay by beta emission is more challenging because of the resultant continuous energy distribution and the substantial range of the emitted beta particles within the silicon detector. Similarly, correlating with conversion electrons presents similar challenges due to their low energy. Results from recent studies at the Accelerator Laboratory of University of Jyväsklyä on experiments focusing on the measurement of low-energy beta and conversion electron signals in decay chains involving 156W [1], 155Lu [2] and 156Ta [3] will be presented. The MARA recoil separator [4] and its advanced array of detectors [5] was deployed and provided new nuclear structure insights, including beta decay half-lives, beta-decay feeding, branching ratios and state multipolarities.
The application of this method to other suitable advanced implantation detectors systems with the aid of simulations will be discussed for future prospective decay spectroscopy experiments.
[1] A. D. Briscoe et al., Phys. Lett. B 847 (2023)
[2] R. J. Carroll, et al., Phys. Rev. C 94, 064311 (2016).
[3] I. G. Darby et al., Phys. Rev. C 83, 064320 (2011)
[4] J. Uusitalo, et al., Acta Phys. Pol. B 50, 319 (2019).
[5] J. Sarén, J. Uusitalo, H. Joukainen, Nucl. Instrum. Methods Phys. Res. B 541, 33–36 (2023).
