The 3He long-counter TETRA at the ALTO ISOL facility

Abstract : A new ββ-decay station (BEDO) has been installed behind the PARRNe mass separator operated on-line at the electron-driven ALTO ISOL facility. The station is equipped with a movable tape collector allowing the creation of the radioactive sources of interest at the very center of a modular detection system. The mechanical structure was designed to host various assemblies of detectors in compact geometry. We report here the first on-line use of this system equipped with the 4π 3He neutron counter TETRA built at JINR Dubna associated with HPGe and plastic 4π β detectors. The single neutron detection efficiency achieved is 53(2)% measured using the 252Cf source. For β-delayed neutron measurements the neutron detection efficiency was derived from the comparison of gated γ-spectra. The on-line commissioning of the TETRA setup was performed with laser-ionized gallium beams. β and neutron events were recorded as a function of time. From these data we report P1n(82Ga)=22(2)% and T1/2T1/2(82Ga)=0.604(11) s in good agreement with values available in the literature. The new detection system will be used in other experiments aimed at investigations of β-decay properties of neutron-rich isotopes produced at ALTO.
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Submitted on : Wednesday, April 6, 2016 - 11:37:26 AM
Last modification on : Thursday, March 15, 2018 - 1:32:56 AM

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D. Testov, D. Verney, B. Roussière, J. Bettane, F. Didierjean, et al.. The 3He long-counter TETRA at the ALTO ISOL facility. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2016, 815, pp.96-103. ⟨10.1016/j.nima.2015.11.150⟩. ⟨in2p3-01298585⟩

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