New experimental limits on neutron - mirror neutron oscillations in the presence of mirror magnetic field

被引：35

作者：

Berezhiani, Z. ^{[1
,2
]}

Biondi, R. ^{[1
,2
]}

Geltenbort, P. ^{[3
]}

Krasnoshchekova, I. A. ^{[4
]}

Varlamov, V. E. ^{[4
]}

Vassiljev, A. V. ^{[4
]}

Zherebtsov, O. M. ^{[4
]}

机构：

[1] Univ Aquila, Dipartimento Fis & Chim, I-67100 Laquila, Italy

[2] INFN, Lab Nazl Gran Sasso, I-67010 Laquila, Italy

[3] Inst Laue Langevin, 71 Ave Martyrs, F-38000 Grenoble, France

[4] Natl Res Ctr, Kurchatov Inst, BP Konstantinov Petersburg Nucl Phys Inst, Gatchina 188300, Leningrad Regio, Russia

来源：

EUROPEAN PHYSICAL JOURNAL C | 2018年 / 78卷 / 09期

关键词：

DARK-MATTER; ANTINEUTRON OSCILLATION; PARITY CONSERVATION; EXPERIMENTAL SEARCH; ULTRACOLD NEUTRONS; UNIFIED PICTURE; UNIVERSE; PHYSICS; PARTICLES; WORLD;

D O I：

10.1140/epjc/s10052-018-6189-y

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Present experimental and astrophysical limits do not exclude that the neutron (n) oscillation into mirror neutron (n'), a sterile state exactly degenerate in mass with the neutron, can be a very fast process, in fact faster than the neutron decay itself, in which case it would have very interesting implications in cosmology and astrophysics. This process is sensitive to the magnetic field. Namely, if the mirror magnetic field B' exists at the Earth, n-n' oscillation probability can be suppressed or resonantly amplified by the applied magnetic field B, depending on its strength and on the angle beta between B and B'. We present the results of ultra-cold neutron storage measurements aiming to check the anomalies observed in previous experiments which could be a signal for n-n' oscillation in the presence of mirror magnetic field B' similar to 0.1 G. From the analysis of the experimental data new lower limits on n-n' oscillation time as a function of B' were obtained, assuming that the mirror magnetic field is constant in time: tau(nn') > 17 s (95% C. L.) for any B' between 0.08 and 0.17 G, and tau(nn') /root cos beta > 27 s (95 % C. L.) for any B' in the interval (0.06 divided by 0.25) G.

引用

页数：12

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