274 research outputs found
Startup of the High-Intensity Ultracold Neutron Source at the Paul Scherrer Institute
Ultracold neutrons (UCN) can be stored in suitable bottles and observed for
several hundreds of seconds. Therefore UCN can be used to study in detail the
fundamental properties of the neutron. A new user facility providing ultracold
neutrons for fundamental physics research has been constructed at the Paul
Scherrer Institute, the PSI UCN source. Assembly of the facility finished in
December 2010 with the first production of ultracold neutrons. Operation
approval was received in June 2011. We give an overview of the source and the
status at startup.Comment: Proceedings of the International Conference on Exotic Atoms and
Related Topics - EXA2011 September 5-9, 2011 Austrian Academy of Sciences,
Theatersaal, Sonnenfelsgasse 19, 1010 Wien, Austria 6 pages, 3 figure
Experimental study of 199Hg spin anti-relaxation coatings
We report on a comparison of spin relaxation rates in a Hg
magnetometer using different wall coatings. A compact mercury magnetometer was
built for this purpose. Glass cells coated with fluorinated materials show
longer spin coherence times than if coated with their hydrogenated homologues.
The longest spin relaxation time of the mercury vapor was measured with a
fluorinated paraffin wall coating.Comment: 9 pages, 6 figures, submitted to JINS
First measurements at the DAΦNE φ-factory with the DEAR experimental setup
The relevant background for the DEAR experiment } low-energy X rays and ionizing particles } present in the DEAR interaction region of the DA'NE e'e~ collider was investigated using the "rst-stage DEAR setup and CCD detectors. An extensive Monte Carlo simulation was performed for the present setup and beam conditions. Good quantitative agreement between measurements and simulation was achieved. This is a con"rmation that, with respect to the expected background, which gives an important contribution to the statistical precision of the experiment, the con"guration chosen to measure the strong interaction shift and width in kaonic hydrogen and kaonic deuterium can indeed reach the planned level of accuracy. ( 2000 Elsevier Science B.V. All rights reserved
Comparison of ultracold neutron sources for fundamental physics measurements
Ultracold neutrons (UCNs) are key for precision studies of fundamental
parameters of the neutron and in searches for new CP violating processes or
exotic interactions beyond the Standard Model of particle physics. The most
prominent example is the search for a permanent electric dipole moment of the
neutron (nEDM). We have performed an experimental comparison of the leading UCN
sources currently operating. We have used a 'standard' UCN storage bottle with
a volume of 32 liters, comparable in size to nEDM experiments, which allows us
to compare the UCN density available at a given beam port.Comment: 20 pages, 30 Figure
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