Thursday, March 24, 2011, 3:00 pm — Small Seminar Room, Bldg. 510
Neutrino reactions recorded by the MINOS Near Detector in exposures totaling 2.8 x10^20 protons-on-target are searched for single, highly-forward pi-0 mesons produced by coherent neutral current interactions. Events having topologies consistent with single electromagnetic showers are isolated. On the plane of visible energy versus beam-angle-cosine, contributions from all neutrino-induced backgrounds are determined using a data-driven fit of Monte Carlo distributions over the null-signal regions. An excess of events above the background is observed for shower topologies of 1.0 to 8.0 GeV visible energies and at very forward angles. The partial cross section for NC( 0) coherent scattering yielding Evis > 1.0 GeV averaged over incident neutrino energies 2.4 < E < 9.0 GeV is (31.6 +/-10.5)x 10^40 cm^2/nucleus. This is the first evidence for neutrino-nucleus coherent
NC( pi-0) scattering on a average nuclear target of A > 30. Total cross sections for coherent scattering from A = 12, 48, and 56 nuclei are estimated for <E > = 4.9 GeV which are in agreement with models based upon the PCAC hypothesis.
Hosted by: David Jaffe
7112 | INT/EXT | Events Calendar
Not all computers/devices will add this event to your calendar automatically.
A calendar event file named "calendar.ics" will be placed in your downloads location. Depending on how your device/computer is configured, you may have to locate this file and double click on it to add the event to your calendar.
Event dates, times, and locations are subject to change. Event details will not be updated automatically once you add this event to your own calendar. Check the Lab's Events Calendar to ensure that you have the latest event information.