CLARION2-TRINITY: A Compton-suppressed HPGe and GAGG:Ce-Si-Si array for absolute cross-section measurements with heavy ions

T. J. Gray*, J. M. Allmond, D. T. Dowling, M. Febbraro, T. T. King, S. D. Pain, D. W. Stracener, S. Ajayi, J. Aragon, L. Baby, P. Barber, C. Benetti, S. Bhattacharya, R. Boisseau, J. Gibbons, S. L. Tabor, V. Tripathi, C. Wibisono, I. Wiedenhöver, L. BignellM. S.M. Gerathy, G. Lane, L. J. McKie, A. J. Mitchell, J. Pope, R. du Rietz, A. E. Stuchbery, K. Vaigneur, T. J. Ruland

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    The design and performance of a new Compton-suppressed HPGe and charged-particle array, CLARION2-TRINITY, are described. The TRINITY charged-particle array is comprised of 64 Cerium-doped Gadolinium Aluminum Gallium Garnet (GAGG:Ce) crystals configured into five rings spanning 7–54 degrees, and two annular silicon detectors that can shadow or extend the angular coverage to backward angles with minimal γ-ray attenuation. GAGG:Ce is a non-hygroscopic, bright, and relatively fast scintillator with a light distribution well matched to SiPMs. Count rates up to 40 kHz per crystal are sustainable. Fundamental characteristics of GAGG:Ce are measured and presented, including light- and heavy-ion particle identification (PID) capability, pulse-height defects, radiation hardness, and emission spectra. The CLARION2 array consists of up to 16 Compton-suppressed HPGe Clover detectors (≈4% efficiency at 1 MeV) configured into four rings (eight HPGe crystal rings) using a non-Archimedean geometry that suppresses back-to-back coincident 511-keV gamma rays. The entire array is instrumented with 100- and 500-MHz (14 bit) waveform digitizers which enable triggerless operation, pulse-shape discrimination, fast timing, and pileup correction. Finally, two examples of experimental data taken during the commissioning of the CLARION2-TRINITY system are given: a PID spectrum from 16O + 18O fusion-evaporation, and PID and Doppler-corrected γ-ray spectra from 48Ti + 12C Coulomb excitation.

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