Seminars & Lectures
| * TITLE | Precision Measurement of the Neutron Lifetime Using Magnetically Trapped Ultracold Neutrons | ||||||
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| * DATE / TIME | 2006-05-03, 4:00~5:30p.m. | ||||||
| * PLACE | APCTP Seoul Branch Office | ||||||
| * ABSTRACT | |||||||
| Accurate measurement of the neutron lifetime is important for understanding the standard model of electroweak interaction and the creation of matter during the Big Bang. Previous measurements of the neutron lifetime have mainly been limited by certain systematic uncertainties. In principle, these could be avoided by performing measurements on neutrons stored in a magnetic trap. The experiment that seeks a precision measurement of the free neutron lifetime using magnetically trapped ultracold neutrons has been developed. The experiment works by loading the trap with UCN through inelastic scattering of 0.89 nm neutrons with phonons in superfluid 4He. Trapped neutrons are detected when they decay; charged decay electrons ionize helium atoms in the superfluid resulting in scintillation light that is recorded in real time using photomultiplier tubes. I will talk about the experiment and current status, including the design of the new Ioffe-type trap and the statistical sensitivity we expect to reach with the improved apparatus at neutron facility, SNS, currently being constructed. |
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