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Abstract
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.