2009 - A new search for processes normally forbidden by the
Pauli exclusion principle has been carried out in 23Na
and 127I:
a new upper limit on the unit time probability
of non-paulian emission of protons with energy Ep>10 MeV has been obtained to be:
1.63 x 10-33 s-1 (90% C.L.).
The corresponding limit on the relative strength (δ2) is:
δ2 < (3 - 4) x 10-55 (90% C.L.).
PEP violating electron transitions in Iodine atoms have also been investigated.
Lifetimes shorter than 4.7 x 1030 s
are excluded at 90%C.L.; the derived limit on the relative strength is:
δ2e < 1.28 x 10-47 (90% C.L.).
This latter limit can also be related to a possible
finite size of the electron in composite models of quarks and leptons providing
superficial violation of the PEP; the obtained upper limit on the electron size is:
r0 > 5.7 x 10-18 cm
(energy scale of E > 3.5 TeV).
Further future devoted data taking is foreseen.
