Several Theta(+) exotic baryon candidates have recently been identified using data from the JINR propane bubble chamber. The pK(0)short invariant mass spectrum shows seven resonant structures ranging from 1487 to 1980 MeV/c^2, including the already established Theta(1540)(+). In the present work the masses of the seven resonances are found to be equally spaced by about 70 MeV/c^2. This regularity is statistically relevant, and is compatible with an overall particle mass quantization scheme.
12.40.Yx Hadron mass models and calculations