Lawrence Livermore National Laboratory

Rob Hoffman

Research Staff
Nuclear and Chemical Sciences Division

 +1 925-424-6411

Postdoctoral Appointment Steward Observatory, Univ. of Tucson, AZ
Ph.D. Astrophysics
University of California at Santa Cruz

Research Interests

My primary focus is the development of accurate nuclear reaction cross sections used in radiochemical analysis techniques to determine device performance assessments of historical underground tests (UGT's) for the Stockpile Stewardship Program. I have also applied this knowledge to develop a radiochemical diagnostic capability on the National Ignition Facility (NIF). Recent work has explored the impact of atomic processes affecting the populations of nuclear excited states and their influence on radiochemistry on the NIF. Most recently I have worked on Quantification of Uncertainties in the production of fission fragments and their use in determining fission yields from UGT's.

I am also interested in the nuclear physics affecting the creation of atomic nuclei in massive stars and supernova physics. This involves theory and experiment. My PhD thesis and subsequent work focused on nucleosynthesis in the Neutrino-Driven Wind in core collapse supernovae and the astrophysical site of the r-process.

Selected Publications

Hoffman, R.D., Zimmerman, G.A., Chen, M., & Cerjan, C., "Nuclear Plasma Interactions on the National Ignition Facility", Stockpile Stewardship Quarterly, Vol. 2, #4, 5 (2013).

Roberts, L., Woosley, S.E. & Hoffman, R.D. "Integrated Nucleosynthesis in the Neutrino-Driven Wind", The Astrophysical Journal, 722, 954 (2010).

Hoffman, R.D., Sheets, S.A., Burke, J.T., Scielzo, N.D., & Norman, E.B. et al. "Reaction Rate Sensitivity of Ti-44 Production in Massive Stars and Implications of a Thick Target Yield Measurement of Ca-40(a,g)Ti-44, The Astrophysical Journal, 715, 1383 (2010).

Fisker, J.L., Hoffman, R.D., & Pruet, J., "On the Origin of the Lightest Molybdenum Isotopes", The Astrophysical Journal, 690, L135 (2009).

Colvin, J., Cerjan, C., Hoffman, R.D., et al., "Radiochemical Tracers as a Mix Diagnostic for the Ignition Double-Shell Capsule", Physics of Plasmas, 15, 102704 (2008).

Hoffman, R.D., Mueller, B., & Janka, H.T., "Nucleosynthesis in O-Ne-Mg Supernovae", The Astrophysical Journal, 676, L127 (2008).

Pruet, J., Hoffman, R.D., Woosley, S.E., Janka, H.T., & Buras, R., "Nucleosynthesis in Early Supernova Winds II. The Role of Neutrinos", The Astrophysical Journal, 644, 1028 (2006).

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