CHICO2, a two-dimensional pixelated parallel-plate avalanche counter

Wu, C. Y.; Cline, D.; Hayes, A.; Flight, R. S.; Melchionna, A. M.; Zhou, C.; Lee, I. Y.; Swan, D.; Fox, R.; Anderson, J. T.

doi:10.1016/j.nima.2016.01.034

Title: CHICO2, a two-dimensional pixelated parallel-plate avalanche counter

Journal Article · Wed Jan 27 00:00:00 EST 2016 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2016.01.034· OSTI ID:1237583

Wu, C. Y. ^[1]; Cline, D. ^[2]; Hayes, A. ^[2]; Flight, R. S. ^[2]; Melchionna, A. M. ^[2]; Zhou, C. ^[2]; Lee, I. Y. ^[3]; Swan, D. ^[4]; Fox, R. ^[5]; Anderson, J. T. ^[6]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Rochester, NY (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Swan Research LLC., Owosso, MI (United States)
CAEN Technologies, Staten Island, NY (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

CHICO₂ (Compact Heavy Ion COunter), is a large solid-angle, charged-particle detector array developed to provide both θ and Φ angle resolutions matching those of GRETINA (Gamma-Ray Energy Tracking In-beam Nuclear Array). CHICO₂ was successfully tested at the Argonne National Laboratory where it was fielded as an auxiliary detector with GRETINA for γ-ray spectroscopic studies of nuclei using a ²⁵²Cf spontaneous fission source, stable beams, and radioactive beams from CARIBU. In field tests of the 72,76Ge beams on a 0.5 mg/cm²208Pb target at the sub-barrier energy, CHICO₂ provided charged-particle angle resolutions (FWHM) of 1.55° in θ and 2.47° in Φ. This achieves the design goal for both coordinates assuming a beam-spot size (>3 mm) and the target thickness (>0.5 mg/cm ²). The combined angular resolution of GRETINA/CHICO₂ resulted in a Doppler-shift corrected energy resolution of 0.60% for 1 MeV coincident de-excitation γ-rays. This is nearly a factor of two improvements in resolution and sensitivity compared to Gammasphere/CHICO. Kinematically-coincident detection of scattered ions by CHICO₂ still maintains the mass resolution (ΔM/M) of ~5% that enhanced isolation of scattered weak beams of interest from scattered contaminant beams.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1237583

Alternate ID(s):: OSTI ID: 1341763

Report Number(s):: LLNL-JRNL-678687

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 814; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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References (16)

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Multifaceted yrast structure and the onset of deformation in ${}^{96, 97}{Sr}$ and ${}^{98, 99}{Zr}$ Wu, C. Y.; Hua, H.; Cline, D. Physical Review C, Vol. 70, Issue 6 https://doi.org/10.1103/PhysRevC.70.064312	journal	December 2004
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