Recent upgrades to the CRIS Decay Spectroscopy Station: Accessing $β$- and $γ$-ray spectroscopy on pure isomeric beams

Simone Casci; Bram van den Borne; Osama Ahmad; Anjali Ajayakumar; Michail Athanasakis-Kaklamanakis; Mia Au; Justus Berbalk; Yazeed Balasmeh; Thomas Elias Cocolios; Saikumar Chinthakayala; Christian Costache; Ruben Pieter de Groote; Carlos Mario Fajardo-Zambrano; Kieran Thomas Flanagan; Ronald Fernando Garcia Ruiz; Reinhard Heinke; Andres Illana; Zakariya Johri; Angelos Karadimas; Anders Kastberg; Ágota Koszorús; Louis Lalanne; Pierre Lassègues; Razvan Lică; Yongchao Liu; Kara Marie Lynch; Abigail McGlone; David Thomas McElroy; Philippe Mispelter; Gerda Neyens; Cătălin Neacşu; Lukas Nies; Andrea Raggio; Jordan Ray Reilly; Jack Shaw; Marek Stryjczyk; Andrei Turturica; Victoria Vedia; Jessica Warbinek; Hilde De Witte; Xiaofei Yang

arXiv · 2610.29627

Recent upgrades to the CRIS Decay Spectroscopy Station: Accessing $β$- and $γ$-ray spectroscopy on pure isomeric beams

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Abstract

The Decay Spectroscopy Station (DSS) of the Collinear Resonance Ionization Spectroscopy (CRIS) experiment at ISOLDE-CERN has been upgraded to perform isomer-selective $β$- and $γ$-ray spectroscopy, including a new tape system to perform spectroscopy, free from residual activity. The baseplate of the detection chamber was redesigned to incorporate the tape, a MicroTOF detector for beam diagnostics, and a custom-made, high-vacuum-compatible plastic scintillator. The vacuum operation reached a stable pressure of $10^{-7}$ mbar in the detection chamber, overcoming vacuum issues from the previous design. Around the detection chamber, up to three high-purity germanium (HPGe) detectors and four LaBr detectors can be installed, giving a total photopeak efficiency of the HPGe detectors of 7% at 200 keV. The implementation of a 24-channel digital DAQ system combines the detection array with the CRIS setup to perform laser-assisted $β$- and $γ$-ray spectroscopy. A commissioning experiment with isomeric beams of $^{106g,106m}$In, purified by narrow-band laser resonance ionization, showed complete removal of activity from the $β$ detector and full separation of the ground and isomeric state of $^{106}$In. An average $β$-detection efficiency of 19(2)% was determined from the experiment.

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Simone Casci, Bram van den Borne, Osama Ahmad, Anjali Ajayakumar, Michail Athanasakis-Kaklamanakis, Mia Au, Justus Berbalk, Yazeed Balasmeh, Thomas Elias Cocolios, Saikumar Chinthakayala, Christian Costache, Ruben Pieter de Groote, Carlos Mario Fajardo-Zambrano, Kieran Thomas Flanagan, Ronald Fernando Garcia Ruiz, Reinhard Heinke, Andres Illana, Zakariya Johri, Angelos Karadimas, Anders Kastberg, Ágota Koszorús, Louis Lalanne, Pierre Lassègues, Razvan Lică, Yongchao Liu, Kara Marie Lynch, Abigail McGlone, David Thomas McElroy, Philippe Mispelter, Gerda Neyens, Cătălin Neacşu, Lukas Nies, Andrea Raggio, Jordan Ray Reilly, Jack Shaw, Marek Stryjczyk, Andrei Turturica, Victoria Vedia, Jessica Warbinek, Hilde De Witte, Xiaofei Yang. 2026-10-21. Recent upgrades to the CRIS Decay Spectroscopy Station: Accessing $β$- and $γ$-ray spectroscopy on pure isomeric beams. https://arxiv.org/abs/2610.29627

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