New experimental limits on the Pauli-forbidden transitions in 12C nuclei obtained with 485 days Borexino data
New experimental limits on the Pauli-forbidden transitions in 12C nuclei obtained with 485 days Borexino data
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DOI：
10.1103/physrevc.81.034317
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发表时间：
2010-03-01
影响因子：
3.1
通讯作者：
Romani, A.
中科院分区：
文献类型：
--
作者：
Bellini, G.;Bonetti, S.;Romani, A.
用Borexino探测器对C-12中的核子（n，p）检验了泡利不相容原理（PEP）。该方法包括搜索1 P（3/2）壳层核子到核中填充的1 S（1/2）壳层的非Paulian跃迁中发射的γ、n、p和β（+/-）。由于极低的背景和巨大的质量（278吨）的Borexino探测器，以下最严格的最新的实验边界的PEP违反跃迁的核子已经建立：tau（C-12 ->（12）（C）代字号+伽马）>= 5.0 x 10（31）年，τ（C-12 ->（11）（B）代字号+ p）>= 8.9 x 10（29）年，τ（C-12 ->（11）（C）代字号+ n）>= 3.4 x 10（30）年，τ（C-12 ->（12）（N）over tilde + e（-）（nu）over tilde（e））>= 3.1 x 10（30）yr，tau（C-12 ->（12）（B）over tilde + e（+）+ nu（e））>= 2.1 x 10（30）yr，均为90% C. L。已将搜索的非Paulian电磁、强和弱跃迁的相对强度的相应上限估计为delta（2）（gamma）
The Pauli exclusion principle (PEP) has been tested for nucleons (n, p) in C-12 with the Borexino detector. The approach consists of a search for gamma, n, p, and beta(+/-) emitted in a non-Paulian transition of 1P(3/2)-shell nucleons to the filled 1S(1/2) 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: tau(C-12 -> (12)(C) over tilde + gamma) >= 5.0 x 10(31) yr, tau(C-12 -> (11)(B) over tilde + p) >= 8.9 x 10(29) yr, tau(C-12 -> (11)(C) over tilde + n) >= 3.4 x 10(30) yr, tau(C-12 -> (12)(N) over tilde + e(-) (nu) over tilde (e)) >= 3.1 x 10(30) yr, and tau(C-12 -> (12) (B) over tilde + e(+) + nu(e)) >= 2.1 x 10(30) 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 delta(2)(gamma)