[Triumf-seminars] TRIUMF Colloquium Seminar today at 14:00

[postmaster@admin.triumf.ca]

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Date/Time: Thu 2006-02-02 at 14:00

Location:  Auditorium          

Speaker:   Richard H. Cyburt (TRIUMF)

Title:     Nuclear Astrophysics:  From the Big Bang to Experiment

Abstract: In the field of nuclear astrophysics, there is a large exchange between experimentalists and astrophysical theorists. This exchange is governed by the need for good data which can be used input to study astrophysical processes. Big Bang Nucleosynthesis (BBN) remains one of the many successes of the hot big bang cosmology. BBN accurately predicts the lightest of the elements and the general concordance between predicted and observed light element abundances provides evidence of this successful theory and probes the baryon content in the universe. I will review the current status of BBN and also discuss how BBN leads to studying some nuclear reactions in more detail.  I will present two interesting cases: the np and 7Be-p radiative capture reactions.

   (1) Adopting a pion-less effective field theory with di-baryon
   fields to obtain an accurate, few parameter representation of np
   scattering, capture and deuteron dissociation data.

   (2) Using universal "exterior" properties of the 7Be-p system to
   determine the astrophysical S-factor for radiative capture (S17),
   and subsequently constraining the 3He-4He radiative capture cross
   section.

Maintaining apt communication between theory and experiment is key to continuing progress in nuclear physics.  Thus, with a clear understanding of theory and observations, one can probe, with high confidence, nuclear astrophysics and cosmology.



Stimulants available 15 minutes before the talk.

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Subscription information available at http://admin.triumf.ca/netdata/seminars/list


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