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Status Of The Ucnτ Experiment, Robert W. Pattie Jr.
Status Of The Ucnτ Experiment, Robert W. Pattie Jr.
Robert W. Pattie Jr.
The neutron is the simplest nuclear system that can be used to probe the structure of the weak interaction and search for physics Beyond the Standard Model. Measurements of neutron lifetime and β-decay correlation coefficients with precisions of 0.02% and 0.1%, respectively, would allow for stringent constraints on new physics. The UCNτ experiment uses an asymmetric magneto-gravitational UCN trap with in situ counting of surviving neutrons to measure the neutron lifetime, \tau_n=877.7(0.7)_{stat}(+0.3 /-0.1 )_{sys}s. I will discuss the recent result from UCNτ, the status of ongoing data collection and analysis, and the path toward a 0.2 …
Preliminary Results From The Ucnτ Experiment, Robert W. Pattie Jr.
Preliminary Results From The Ucnτ Experiment, Robert W. Pattie Jr.
Robert W. Pattie Jr.
There is currently a 4σ discrepancy between measurements of the neutron lifetime performed using cold neutron beams and those performed with ultracold neutron (UCN) storage vessels. The UCNτ experiment uses an asymmetric magneto-gravitational UCN trap with {\it in situ} counting of surviving neutrons to measure the neutron lifetime. This design eliminates a major systematic of previous bottle experiments related to the loss of UCN on material trap walls and with unloading neutrons from the storage vessel. A new {\it in situ} detection system was used in the 2015-2016 run that was able to measure the population of surviving …