Conveners
not neutrons! And non-exploding stars
- Stuart Sim (Queen's University Belfast)
The $\gamma$-process is a nucleosynthesis scenario that occurs during an explosion of a supernova and produces the proton-rich isotopes of elements between Se and Hg. The $\gamma$-process involves series of ($\gamma$,n), ($\gamma$,p) and ($\gamma$,$\alpha$) reactions on pre-existing s-process seed nuclei. The reactions relevant for the $\gamma$-process can be studied in the laboratory via the...
The CRYRING array for reaction measurements (CARME) is a charged particle detector array installed at the CRYRING storage ring designed to perform nuclear reaction measurements directly
at stellar energies, and indirect studies of key nuclear properties. Heavy-ion beams are circulated
around the ring and interact with an ultra-thin gas-jet target. The reaction products are detected by
four,...
The 16O(p,γ)17F reaction is the slowest proton-induced reaction in the CNO cycle [1]. This is due to the fact that at energies of astrophysical interest it has no resonances, making it an example of a pure direct capture reaction [2]. The ratio of 16O/17O in stars depends strongly on the rate of this reaction. This ratio is an important probe of nucleosynthesis and mixing processes in the...
One of the key sources of new elements in the Universe is the explosion of massive stars (core collapse supernovae) and their remnants (kilonovae). Understanding the stars that led to these explosions, and the evolutionary steps they must have followed, is essential to constructing a detailed picture of how our Universe was enriched over cosmic time. In this talk I will present two approaches...
In recent years, it has become apparent that realistic, 3D progenitors can play an important role in the explosions of neutrino-driven core-collapse supernovae. While 3D shell convection simulations have been performed for a number of progenitors, thus far, tests haven't been done for magnetorotational supernova progenitors. These progenitors are expected to be very rapidly rotating and...
Through the survey of Planetary Nebulae (PNe) in M31 with Megacam@CFHT, we identify ~5000 PNe in M31 with ~1200 having spectroscopic observations from Hecospec@MMT (~300 of which also have chemical abundance measurements). We find the kinematically and chemically distinct thin and thick discs of M31, as well as the kinematics of its inner-halo substructures. Of particular note, we find that...
