SABRE: A new NaI(Tl) dark matter direct detection experiment
SABRE (Sodium-iodide with Active Background REjection) is a new NaI(Tl) experiment designed to test the DAMA/LIBRA claim for a positive WIMP-dark matter annual modulation signal. SABRE will consist of highly pure NaI(Tl) crystals in an active liquid scintillator veto that will be placed deep underground. The scintillator vessel will provide a veto against external backgrounds and those arising from detector components, especially the 3 keV signature from the decay of 40K in the crystal. It will therefore allow for a sensitive measurement of the 40K levels in the crystals as they are developed. Through the use of the veto and crystal purification techniques, we aim for a 40K background 10 times lower than that of the DAMA/LIBRA experiment. We present our work developing low-background NaI(Tl) crystals with a highly pure NaI powder and the development of the veto technology.