Resonance degrees of freedom in the two-nucleon system

On the ΔΔ component of the deuteron in the Nambu-Jona-Lasinio model of light nuclei

“…Such a definition of the contribution of the ∆∆ component to the deuteron is in agreement with that given by Niephaus et al [12] in the potential model approach (PMA).…”

“…Indeed, for the ∆(1232) resonance on-mass shell [1,12] we predict P (∆∆) = 0.3 % whereas experimentally P (∆∆) is restricted by P (∆∆) < 0.4% at 90% of CL [14].…”

Non–Nucleonic Degrees of Freedom

“…The results for the saturation density and energy in the framework of the "gap choice" are very close to the ones reported in the work of Niephaus et al [65] The differences are due essentially to the use of different potentials. As expected, the calculations made in the "continuous choice", are quite different.…”

“…More complete calculations were performed by Manzke and Gari [64] and Niephaus, Gari and Sommer [65] with a modified Reid potential with extra n and p exchange operators [32], in order to express the transitions to NA and A A states. The full interaction is refitted to the scattering data and is phase equivalent to the Reid soft core potential.…”

Medium effects on binary collisions with the Δ resonance

“…[11][12][13]. It was found that the πNN data can be best reproduced by using: (1) the vertex interaction h πN ↔∆ determined from fitting the πN scattering phase shift in P 33 channel, (2) the one-pion-exchange model [18] of the transition potentials V N N ↔N ∆ and V N ∆,N ∆ with a monopole form factor of a cutoff parameter Λ= 650 MeV/c (3), the NN interaction V N N,N N of Eq. (16) is defined by using a subtraction of the Paris potential [19] …”