[Jlabsa_gs] **Today** Pizza Seminar - Wednesday, April 16, 2014 - A Message From Hari Areti

[Jodi Patient]

Thank you to all of those who RSVP'd.  See you at noon today.

Jefferson Lab's Graduate Student and Post-Doc Association Wiki:
  https://gspda.jlab.org/wiki/index.php/Main_Page

         Please RSVP to:  patient at jlab.org by COB on April 14, 2014

                         Wednesday, April 16, 2014

                                 ***F113***

                               12:00-1:00 pm

 "Measurement of 16O(γ,α)12C with bubble chamber and bremsstrahlung 
                       beam at Jefferson Lab Injector"

        

                               Riad Suleiman


                               Jefferson Lab

                              

Abstract:  The carbon-helium fusion reaction is considered to be the 
key reaction in the helium burning of stars because it determines not 
only the carbon and oxygen abundances in stars and, ultimately, in the 
universe, but also the nucleosynthesis of all heavier elements.

At Jefferson Lab, we plan to obtain the rate for this reaction by 
measuring the inverse process, i.e., the photo-disintegration of oxygen 
into helium and carbon. This measurement would be based on a novel 
bubble-chamber technique, which makes use of the fact that a super-heated 
liquid (Nitrous Oxide) is sensitive to recoiling helium and carbon nuclei 
produced by photo-disintegration of the oxygen nuclei in the liquid.

In this talk, I will present a description of the Bubble Chamber and the 
experimental setup at Jefferson Lab Injector, and show how we can use a 
Bremsstrahlung beam to measure photo-nuclear cross sections.