Photoabsorption on 4He with a realistic nuclear force.
The 4He total photoabsorption cross section is calculated with the realistic nucleon-nucleon potential Argonne V18 and the three-nucleon force (3NF) Urbana IX. Final state interaction is included rigorously via the Lorentz integral transform method. A rather pronounced giant resonance with peak cross sections of 3.0 (3.2) mb is obtained with (without) the 3NF. Above 50 MeV strong 3NF effects, up to 35%, are present. Good agreement with experiment is found close to threshold. A comparison in the giant resonance region is inconclusive, since data do not show a unique picture.
Gazit
Doron
D
The Racah Institute of Physics, The Hebrew University, 91904 Jerusalem, Israel.
Bacca
Sonia
S
Barnea
Nir
N
Leidemann
Winfried
W
Orlandini
Giuseppina
G