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The Pauli exclusion principle (PEP) has been tested for nucleons ($n,p$) in$^{12}C$ and $^{16}O$ nuclei, using the results of background measurements withthe prototype of the Borexino detector, the Counting Test Facility (CTF). Theapproach consisted of a search for $\gamma$, $n$, $p$ and/or $\alpha$'s emittedin a non-Paulian transition of 1$P$- shell nucleons to the filled 1$S_{1/2}$shell in nuclei. Similarly, the Pauli-forbidden $\beta^{\pm}$ decay processeswere searched for. Due to the extremely low background and the large mass (4.2tons) of the CTF detector, the following most stringent up-to-date experimentalbounds on PEP violating transitions of nucleons have been established:$\tau(^{12}C\to^{12}\widetilde{C}+\gamma) > 2.1\cdot10^{27}$ y,$\tau(^{12}C\to^{11}\widetilde{B}+ p) > 5.0\cdot10^{26}$ y,$\tau(^{12}C(^{16}O)\to^{11}\widetilde{C}(^{15}\widetilde{O})+ n) > 3.7 \cdot10^{26}$ y, $\tau(^{12}C\to^{8}\widetilde{Be}+\alpha) > 6.1 \cdot 10^{23}$ y,$\tau(^{12}C\to^{12}\widetilde{N}+ e^- + \widetilde{\nu_e})> 7.6 \cdot 10^{27}$y and $\tau(^{12}C\to^{12}\widetilde{B}+ e^+ + \nu_e)> 7.7 \cdot 10^{27}$ y,all at 90% C.L.Comment: 10 pages, 5 figures. Submitted to European Physical Journal C  Spokesperson of the Borexino Collaboration: G.Bellini. Corresponding authors:  A.Derbin, O.Smirno

New experimental limits on violations of the Pauli exclusion principle obtained with the Borexino Counting Test Facility