On the Delta-Delta component of the deuteron in the Nambu-Jona-Lasinio   model of light nuclei
  The probability P(Delta-Delta) to find the Delta-Delta component inside the deuteron, where Delta stands for the Delta(1232) resonance, is calculated in the Nambu-Jona-Lasinio model of light nuclei. We obtain P(Delta-Delta) = 0.3%. This prediction agrees good with the experimental estimate P(Delta-Delta) < 0.4% at 90% of CL (D. Allasia et al., Phys. Lett. B174 (1986) 450). 
A.N. Ivanov, H. Oberhummer, N.I. Troitskaya, M. Faber