New experimental limits on the Pauli-forbidden transitions in C12 nuclei obtained with 485 days Borexino data

G. Bellini et al. (Borexino Collaboration)
Phys. Rev. C 81, 034317 – Published 29 March 2010

Abstract

The Pauli exclusion principle (PEP) has been tested for nucleons (n,p) in C12 with the Borexino detector. The approach consists of a search for γ, n, p, and β± emitted in a non-Paulian transition of 1P3/2-shell nucleons to the filled 1S1/2 shell in nuclei. Due to the extremely low background and the large mass (278 tons) of the Borexino detector, the following most stringent up-to-date experimental bounds on PEP violating transitions of nucleons have been established: τ(12C12C~+γ)5.0×1031 yr, τ(12C11B~+p)8.9×1029 yr, τ(12C11C~+n)3.4×1030 yr, τ(12C12N~+e+νe~)3.1×1030 yr, and τ(12C12B~+e++νe)2.1×1030 yr, all at 90% C.L. The corresponding upper limits on the relative strengths for the searched non-Paulian electromagnetic, strong and weak transitions have been estimated as δγ22.2×1057, δN24.1×1060, and δβ22.1×1035.

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  • Received 6 November 2009

DOI:https://doi.org/10.1103/PhysRevC.81.034317

©2010 American Physical Society

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Vol. 81, Iss. 3 — March 2010

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