Nucleon Capture Cross Sections
Calculated from ab initio Wave Functions
Speaker:
Christian Forssen
Lawrence Livermore National Laboratory
Abstract:
I will discuss present attempts to employ high-precision nuclear
structure information, from a microscopic many-body model, in nuclear
reaction calculations. The ultimate goal is to develop a fundamental
theory for light-ion fusion reactions based on realistic inter-nucleon
forces. The foundation of our approach is the ab initio no-core shell
model (NCSM), which is a well-established theoretical framework aimed
at an exact description of nuclear structure starting from
high-precision interactions between the nucleons. After a short
introduction to the nuclear many-body problem, and the NCSM in
particular, I will describe how we can extract translationally
invariant cluster form factors (overlap functions) from A-body wave
functions in the harmonic-oscillator basis space, and subsequently use
them in cross section calculations. Examples will be given for a few
capture reactions that are of interest for nuclear astrophysics.