Engineering topics
Publications and source records attributed to Young, A R.
The Majorana Collaboration is assembling an array of HPGe detectors to search for neutrinoless double-beta decay in {sup 76}Ge. Initially, Majorana aims to construct a prototype module to demonstrate the potential of a future 1-tonne experiment. The design and potential reach of this prototype Demonstrator module are presented.
The phenomenon of passive compression of frequency-modulated (FM) pulses in a dispersive media (DM) was used to increase the peak microwave power up to the multigigawatt level. A helically corrugated waveguide was used as the DM, while a relativistic X-band backward-wave oscillator (RBWO) with a descending-during-the-pulse accelerating voltage served as a source of FM pulses. Compression of pulses down to a halfwidth of 2.2 ns accompanied by a 4.5-fold power increase up to a value of about 3.2 GW has been demonstrated.
A precise measurement of the neutron decay {beta} asymmetry A{sub 0} has been carried out using polarized ultracold neutrons from the pulsed spallation ultracold neutron source at the Los Alamos Neutron Science Center. Combining data obtained in 2008 and 2009, we report A{sub 0}=-0.119 66{+-}0.000 89{sub -0.00140}{sup +0.00123}, from which we determine the ratio of the axial-vector to vector weak coupling of the nucleon g{sub A}/g{sub V}=-1.275 90{sub -0.00445}{sup +0.00409}.