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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1781
DTSTART:20100311T220000Z
DURATION:PT1H0M0S
DTSTAMP:20260506T161708Z
LAST-MODIFIED:20100308T181319Z
LOCATION:4274 Chamberlin
SUMMARY:Physics with ultra-cold and very cold neutrons at the Institut
  Laue-Langevin in Grenoble\, France\, NPAC (Nuclear/Particle/Astro/Cos
 mo) Forum\, Peter Geltenbort\, Institute Laue-Langevin\, Grenoble
DESCRIPTION:Due to their outstanding property to be storable and hence
  observable for long periods of time (several hundreds of seconds) in 
 suitable material or magnetic traps\, ultra-cold neutrons (UCN)with en
 ergies around 100 neV are an unique tool to study fundamental properti
 es of the free neutron. Their properties and production are described 
 in detail. Selected experiments with ultra-cold neutrons (UCN) - the m
 easurement of its lifetime and the search for an electric dipole momen
 t - performed at the instrument &amp\;quot\;Physique Fondamentale 2 (P
 F2)&amp\;quot\; of the Institut Laue-Langevinn (ILL) are highlighted. 
 For particles to have electric dipole moments\, the forces concerned i
 n their structure must be asymmetric with regard to space-parity (P) a
 nd time reversal (T). P violation is a well-known intrinsic feature of
  the weak interaction which is responsible for the beta-decay of the f
 ree neutron. T violation turns out to be necessary to explain the surv
 ival of matter at the expense of antimatter after the Big Bang. By sea
 rching for an EDM of the free neutron hypothetical new channels of T-v
 iolation can be investigated. The experiments at the ILL will be compa
 red to competing EDM projects worldwide. The measurement of the lifeti
 me of the free neutron together with the determination of one of the c
 orrelation parameters characterizing neutron decay allows tests of the
  Standard Model. Furthermore\, the neutron lifetime plays an important
  role in Big-Bang Nucleosynthesis cosmology. Up to 180 s after the big
 -bang nuclei with more than one nucleon are unstable. The neutron life
 time determines how many neutrons have decayed up to this moment and h
 ence the relative helium abundance in the universe. The different meth
 ods to measure the lifetime of the free neutron are reviewed and the l
 atest experiments using storage of UCN at the ILL are described in det
 ail. A brief outlook on future projects worldwide will be given.
URL:https://www.physics.wisc.edu/events/?id=1781
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