2012/02/02 by W. Horiuchi, Y. Suzuki, K. Arai · 1 citation
Physics and Astronomy · #Ab initio #Atomic and Molecular Physics #Atomic physics #Cross section (physics) #Energy (signal processing) #Nuclear physics #Nuclear physics research studies #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Section (typography) #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevc.85.054002
15 pages, 12 figures
arxiv created 2012/02/02 · openalex publication_date 2012/05/03 · arxiv updated 2015/06/04 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
There are some discrepancies in the low-energy data on the photoabsorption cross section of 4He. We calculate the cross section with realistic nuclear forces and explicitly correlated Gaussian functions. Final-state interactions and two- and three-body decay channels are taken into account. The cross section is evaluated using two methods: With the complex scaling method the total absorption cross section is obtained up to the rest energy of a pion, and with the microscopic R-matrix method cross sections for both 4He(\ensuremathγ,p)3H and 4He(\ensuremathγ,n)3He are calculated below 40 MeV. Both methods give virtually the same result. The cross section rises sharply from the 3H+p threshold, reaching a giant resonance peak at 26--27 MeV. Our calculation reproduces almost all the data above 30 MeV. We stress the importance of 3H+p and 3He+n cluster configurations on the cross section as well as the effect of the one-pion exchange potential on the photonuclear sum rule.