A new Brute force low-temperature nuclear orientation set-up to search for physics beyond the standard electroweak model

Abstract A new Brute Force Low-Temperature Nuclear Orientation set-up has been installed. The aim of this new apparatus is to search for a tensor component in the weak interaction. The set-up consists mainly of a 3 He– 4 He dilution refrigerator equipped with a 17 T superconducting magnet to orient nuclei and a Si PIN photodiode operating at a temperature of about 10 K for the detection of β -particles. The lowest temperature that has been achieved with this system until now is 4.9 mK in a magnetic field of 0.1 T and 8.6 mK in 14 T. The set-up is now fully operational and the first test measurements of the 60 Co β -asymmetry have been performed.