The Pauli exclusion principle (PEP) has been tested for nucleons (n,p) in 12C and 16O 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 γ, n, p and/or α's emitted in a non-Paulian transition of 1P- shell nucleons to the filled 1S1/2 shell in nuclei. Similarly, the Pauli-forbidden β± 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: τ(12C→12C˜+γ)>2.1⋅1027 y, τ(12C→11B˜+p)>5.0⋅1026 y, τ(12C(16O)→11C˜(15O˜)+n)>3.7⋅1026 y, τ(12C→8Be˜+α)>6.1⋅1023 y, τ(12C→12N˜+e−+νe˜)>7.6⋅1027 y and τ(12C→12B˜+e++νe)>7.7⋅1027 y, all at 90% C.L.
New experimental limits on violations of the Pauli exclusion principle obtained with the Borexino Counting Test Facility / Back, H. O.; Suvorov, Y.; Et, Al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 37:4(2004), pp. 421-431. [10.1140/epjc/s2004-01991-1]
New experimental limits on violations of the Pauli exclusion principle obtained with the Borexino Counting Test Facility
Suvorov, Y.;
2004
Abstract
The Pauli exclusion principle (PEP) has been tested for nucleons (n,p) in 12C and 16O 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 γ, n, p and/or α's emitted in a non-Paulian transition of 1P- shell nucleons to the filled 1S1/2 shell in nuclei. Similarly, the Pauli-forbidden β± 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: τ(12C→12C˜+γ)>2.1⋅1027 y, τ(12C→11B˜+p)>5.0⋅1026 y, τ(12C(16O)→11C˜(15O˜)+n)>3.7⋅1026 y, τ(12C→8Be˜+α)>6.1⋅1023 y, τ(12C→12N˜+e−+νe˜)>7.6⋅1027 y and τ(12C→12B˜+e++νe)>7.7⋅1027 y, all at 90% C.L.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
