1. Nuclear Astrophysics Working Group Discussion

2. Schedule 6:00 – 6:15Philippe Collon (p-process: AMS) 6:15 – 6:30 Alan Chen (Classical novae/X-ray bursts) 6:30 – 6:45Sergio Almaraz-Calderon (fusion: MUSIC detector) 6:45 – 7:00 Nick Scielzo (r-process:  -delayed neutron emission) 7:00 – 7:15Matt Mumpower (r-process: mass sensitivity studies) 7:15 – 7:30Hye Young Lee (r-process: APOLLO at HELIOS) 7:30 – 7:40Guy Savard (r-process: N = 126 factory, masses) 7:40 – 8:00Discussion

3. ATLAS Questionnaire What are the most important physics questions you plan to study at ATLAS over the next 5 – 10 years? – reduce reaction rate uncertainties for those reactions important in explosive nucleosynthesis (e.g. classical novae, type I XRBs) – understanding the r-process: “surrogate” reactions masses beta-delayed neutron emission – p process nuclei – Fusion with nuclei far from stability – Other processes/site: e.g. early stars, s-process, etc.

4. How do these questions relate to the present priorities of the field? – They relate well, addressing multiple questions put forth in The Frontiers of Nuclear Science: A long range plan (2007): What is the nature of neutron stars and dense nuclear matter? What is the origin of the elements in the cosmos? What are the nuclear reactions that drive stars and stellar explosions? – Fit in nicely with planned nuclear astrophysics research at ReA3 and FRIB – Complimentary to research priorities of JINA

5. What developments in accelerator capabilities and instrumentation do you envision as being needed to optimize the Nuclear Astrophysics research program at the facility? – Current developments: gas target, ionization chamber, APOLLO for HELIOS new BPT trap for beta-delayed neutron studies N = 126 factory at CARIBU – Planned developments: increased radioactive ion beam intensities and purities target development to take advantage of high intensities – Future developments? multi-user capabilities neutron detection capabilities?

6. Are you interested in actively participating in the development of new instrumentation and capabilities for ATLAS? – yes: several of the users in the session are actively involved in commissioning of new equipment and are interested in future projects e.g. APOLLO (LANL), HELIOS ionization chamber (LSU) – Interest in future planned projects (e.g. AIRIS, AGFA)??

7. Did you identify other important issues that the Executive Committee of the ATLAS User Group and the ATLAS management should make a priority for the facility?