ISSN:
1434-6052
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract. The Pauli exclusion principle (PEP) has been tested for nucleons (n,p) in ${}^{12}{\rm C}$ and ${}^{16}{\rm O}$ nuclei, using the results of background measurements with the prototype of the Borexino detector, the Counting Test Facility (CTF). The approach consisted of a search for $\gamma$ , n, p and/or $\alpha$ ’s emitted in a non-Paulian transition of 1P- shell nucleons to the filled 1S 1/2 shell in nuclei. Similarly, the Pauli-forbidden $\beta^{\pm}$ decay processes were searched for. Due to the extremely low background and the large mass (4.2 tons) of the CTF detector, the following most stringent up-to-date experimental bounds on PEP violating transitions of nucleons have been established: $\tau({}^{12}{\rm C} \rightarrow {}^{12}{\rm\widetilde C} + \gamma) 〉 2.1\cdot10^{27} \mathrm y$ , $\tau({}^{12}{\rm C} \rightarrow {}^{11}{\rm\widetilde B} + p) 〉 5.0\cdot10^{26} {\mathrm{y}}$ , $\tau({}^{12}{\rm C} ({}^{16}{\rm O}) \rightarrow {}^{11}{\rm\widetilde C} ({}^{15}{\rm\widetilde O} ) + n) 〉 3.7 \cdot 10^{26} {\mathrm{y}}$ , $\tau({}^{12}{\rm C} \rightarrow {}^{8}{\rm\widetilde{Be}} + \alpha) 〉 6.1 \cdot 10^{23} \mathrm y$ , $\tau({}^{12}{\rm C} \rightarrow {}^{12}{\rm\widetilde N} + e^- + \widetilde{\nu_e}) 〉 7.6 \cdot 10^{27} \mathrm y$ and $\tau({}^{12}{\rm C} \rightarrow {}^{12}{\rm\widetilde B} + e^ + + \nu_e) 〉 7.7 \cdot 10^{27} \mathrm y$ , all at $90 \%$ C.L.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1140/epjc/s2004-01991-1
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