Ban G, Bodek K, Daum M, Henneck R, Heule S, Kasprzak M, Khomutov N, Kirch K, Kistryn S, Knecht A, Knowles P, Kuźniak M, Lefort T, Mtchedlishvili A, Naviliat-Cuncic O, Plonka C, Quéméner G, Rebetez M, Rebreyend D, Roccia S, Rogel G, Tur M, Weis A, Zejma J, Zsigmond G
LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, Caen, France.
Phys Rev Lett. 2007 Oct 19;99(16):161603. doi: 10.1103/PhysRevLett.99.161603.
In case a mirror world with a copy of our ordinary particle spectrum would exist, the neutron n and its degenerate partner, the mirror neutron n', could potentially mix and undergo nn' oscillations. The interaction of an ordinary magnetic field with the ordinary neutron would lift the degeneracy between the mirror partners, diminish the n' amplitude in the n wave function and, thus, suppress its observability. We report an experimental comparison of ultracold neutron storage in a trap with and without superimposed magnetic field. No influence of the magnetic field is found and, assuming negligible mirror magnetic fields, a limit on the oscillation time taunn' > 103 s (95% C.L.) is derived.
如果存在一个具有与我们普通粒子谱副本的镜像世界，中子n及其简并伙伴镜像中子n'可能会混合并经历nn'振荡。普通磁场与普通中子的相互作用会消除镜像伙伴之间的简并性，减小n'在n波函数中的振幅，从而抑制其可观测性。我们报告了在有和没有叠加磁场的陷阱中对超冷中子存储进行的实验比较。未发现磁场的影响，并且假设镜像磁场可忽略不计，得出振荡时间taunn' > 103秒（95%置信水平）的限制。
