Speaker
Description
The Collinear Resonance Ionization Spectroscopy (CRIS) experiment at CERN ISOLDE is used to perform hyperfine structure and isotope shift measurements [1]. The resonance ionization in collinear geometry provides selectivity over different nuclear isomeric states, which decay can be measured at the Decay Spectroscopy Station (DSS). The DSS setup has been under development over the years [2,3] and found its main applications in isomer-selective alpha-decay measurements of francium isotopes [4,5]. Furthermore, it was used in decay tagging, a technique previously used at CRIS to suppress background in hyperfine spectra generated by a 104 excess of stable isobaric contamination in the beam [6].
The DSS has been recently upgraded with a tape system for removal of long-lived activity, a newly designed in-vacuum plastic scintillator and an array of High Purity Germanium detectors, LaBr$_3$ and CeBr$_3$ scintillation detectors. A measurement campaign was performed in the context of the IS772 experiment at ISOLDE [7], where beta-gamma spectroscopy of resonantly ionized isomeric states in $^{106}$In and $^{104}$In was performed. In this contribution, the recent developments of the DSS and the performance of the setup will be discussed, along with preliminary results on the decay of $^{104m}$In.
References:
[1] X. F. Yang, S. J. Wang, S. G. Wilkins, & R. G. Ruiz, Progress in Particle and Nuclear Physics 129, 104005. (2023)
[2] M. M. Rajabali, K. M. Lynch, T. E. Cocolios et al., Nuclear Instruments and Methods in Physics, Vol. 707 (2013).
[3] K.M. Lynch, T.E. Cocolios et al., Nuclear Instruments and Methods in Physics, Vol. 844 (2017)
[4] K. M. Lynch et al., Phys. Rev. X 4, 011055 (2014)
[5] G. J. Farooq-Smith et al., Phys. Rev. C 94, 054305 (2016)
[6] Á. Koszorús et al., Nature Physics 17, 439-443 (2021).
[7] J. Warbinek et al., CERN-INTC-2024-072 (2024).
