First, a derivation of the expected number density of the cosmic neutrino background (CNB) will be reviewed, and its role in the Hot Big-Bang Cosmology stressed. Next I will discuss the amount of possible density enhancement in galactic clusters of massive, and by now nonrelativistic, CNB neutrinos. The application of coherent scattering to the detection of CNB will be also reviewed, and its difficulties explained. The main part of the talk will be concerned with the detection of the CNB using radioactive targets. While such an approach is extremely difficult, one can envisage that it might eventually work provided the neutrino mass is sufficiently large, perhaps at least 0.1 eV.
Refreshments will be available before the colloquium, at 3:45 pm, in the lobby of Dane Smith Hall.
Individuals with disabilities who need an auxiliary aid or service to attend or participate in P&A events should contact Daniel Sandoval (phone: 505-277-2616, email: daswerto@unm.edu) well in advance to ensure your needs are accommodated. Event handouts can be provided in alternative accessible formats upon request. Please contact Mr. Sandoval if you need written information in an alternative format.
University of New Mexico Department of Physics and Astronomy -
MSC07 4220 -
800 Yale Blvd NE
Albuquerque, New Mexico 87131-0001
Phone: (505) 277-2616
Fax: (505) 277-1520
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Spring 2009
Individuals with disabilities who need an auxiliary aid or service to attend or participate in P&A events should contact Daniel Sandoval (phone: 505-277-2616, email: 
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