1304.5491 (Micah D. Schuster et al.)

Ab initio many-body calculations of the 4He photo-absorption cross
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Micah D. Schuster, Sofia Quaglioni, Calvin W. Johnson, Eric D. Jurgenson, Petr Navratil

A major goal of nuclear theory is to make quantitative calculations of low-energy nuclear observables starting from microscopic internucleon forces. Computationally, this is complicated by the large model spaces needed to reach convergence in many-body approaches, such as the no-core shell model (NCSM). In recent years, the similarity renormalization group (SRG) has provided a powerful and versatile means to soften interactions for ab initio structure calculations, thus leading to convergence within smaller model spaces. Here we compute the 4He total photo absorption cross section and study, for the first time, the consistency of the SRG approach in a continuum observable.

View original: http://arxiv.org/abs/1304.5491