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Subatomic Physics – Infrastructure


K600 Magnetic Spectrometer

The K=600 magnetic spectrometer at iThemba LABS is a high resolution kinematically corrected magnetic spectrometer for light ions. It has the capability to measure inelastically scattered particles and reactions at extreme forward angles that includes zero degrees, making it one of only two facilities worldwide (the other being at RCNP, Japan) where high energy resolution is combined with zero degree measurements at medium beam energies.

ALBA (African LaBr Array)

Array of large-volume LaBr3:Ce detectors of 89mm diameter and 203mm length. Currently 6 detectors available and will be increased to 23 detectors in 2020.

Fast Timing Array

Eight 2”x”2 LaBr3(Ce) detectors, which are  scintillation detectors bearing good efficiency for photon detection (~3%) and excellent timing resolution (~<400ps).

AFRODITE (Clover+BGO array)

14 Clover and BGO detectors are currently available. This will increase to 18 Clover and 17 BGO in 2020. Each Clover consists of four 50 x 70 mm HPGe crystals.

LEPS (Low-energy photon detectors)

Eight Low Energy Photon detector are available and can be coupled to ALBA or AFRODITE detectors. The LEPS consist of four segmented planar Ge detectors of 2800 mm2 x 10 mm.

CAKE (array of silicon detectors)

CAKE consists of up to six wedge-shaped double sided silicon strip detectors (DSSSDs) of the MMM design, placed in a lampshade configuration upstream from the target ladder.

Electron Spectrometer

The electron spectrometer consists of two Siegbahn-Kleinheiz lenses which can be operated together or independently. Electrons are focussed by the lens from the target onto a Si(Li) detectors of up to 6mm thickness.

Quasi mono-energetic neutron beams

Quasi-monoenergetic neutrons are typically produced in the D-line (neutron) facility by the 7Li(p,n)7Be or 9Be(p,n)9B reactions. Even at 200 MeV virtually single-turn extracted, nanosecond-pulsed beam can be delivered making a background free interval between pulses possible.

Tape Station

A tape station is available for decay measurements on the A-Line, when the 1.5m scattering chamber is removed. The single-spool design has 50m of 12 mm wide mylar tape, capable of moving at a maximum speed of 1 ms-1, and transporting activity 2.5 m from the implantation point to a measuring station.

Environmental Radiation Laboratory

The laboratory-based hyper-pure germanium (HPGe) detector is a p-type, 45% relative efficiency, 2 keV FWHM resolution at 1.33 MeV Canberra detector system. The HPGe detector is customized for measuring low-activity samples. The system is placed in a low-background environment by surrounding the detector crystal with 10 cm thick lead castle. The castle has thin copper lining inside to attenuate the low-energy X-rays introduced by gamma-rays mainly in lead.