Nuclear Astrophysics Working Group Discussion

Schedule6:00 – 6:15 Philippe Collon (p-process: AMS)

6:15 – 6:30 Alan Chen (Classical novae/X-ray bursts)

6:30 – 6:45 Sergio Almaraz-Calderon (fusion: MUSIC detector)

6:45 – 7:00 Nick Scielzo (r-process: b-delayed neutron emission)

7:00 – 7:15 Matt Mumpower (r-process: mass sensitivity studies)

7:15 – 7:30 Hye Young Lee (r-process: APOLLO at HELIOS)

7:30 – 7:40 Guy Savard (r-process: N = 126 factory, masses)

7:40 – 8:00 Discussion

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.

• 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

• 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?

• 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)??

• 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?