The $^4$He total photo-absorption cross section with two- plus three-nucleon interactions from chiral effective field theory

Understand

The total photo-absorption cross section of $^4$He is evaluated microscopically using two- (NN) and three-nucleon (NNN) interactions based upon chiral effective field theory ($\chi$EFT).

• The calculation is performed using the Lorentz integral transform method along with the {\em ab initio} no-core shell model approach.
• An important feature of the present study is the consistency of the NN and NNN interactions and also, through the Siegert theorem, of the two- and three-body current operators.
• This is due to the application of the $\chi$EFT framework.