Origin of the signals registered on february 23, 1987 in gravity antennas

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During the SN1987A outburst on February 23, 1987, four underground neutrino detectors and two gravitational antennas in Rome and Maryland detected signals associated with the gravitational collapse of the star’s core. Since it is impossible to detect direct gravitational radiation from the collapse of SN1987A with antennas, it is still not clear what events were recorded by gravitational antennas. In this work, an amplitude analysis of the signals from gravitational antennas in Rome and Maryland in the vicinity of the signals from neutrino detectors during Supernova SN1987A was carried out. It is shown that the amplitude distributions in all antenna signals are consistent with the distribution of fluctuating energy losses of atmospheric muons crossing the antennas. A conclusion has been made about the muon origin of signals detected by “Weber” type antennas — aluminized cylinders with a mass of 2–3 tons.

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作者简介

N. Agafonova

Institute for Nuclear Research of the Russian Academy of Sciences

编辑信件的主要联系方式.
Email: Agafonova@inr.ru
俄罗斯联邦, Moscow

A. Malgin

Institute for Nuclear Research of the Russian Academy of Sciences

Email: Agafonova@inr.ru
俄罗斯联邦, Moscow

参考

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2. Fig. 1. Events in the Rome (RGA) (a) and Maryland (MGA) (b) gravity detectors in the time vicinity τ of the LSD signal at 2 h 52 min UT on 23.02.1987. The vertical lines in Fig. a highlight the region of the LSD signal. The dotted curves correspond to the average temperature of the events: a — T = 29 K; b — T = 31 K.

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3. Fig. 2. Differential energy distributions of 55 RGA events in the vicinity of the LSD signal at 2:52 UT on 23.02.1987 (histogram in Fig. a) and its integral form (b). The straight line in Fig. b — exp(–T/) — corresponds to = 29 K.

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4. Fig. 3. Differential spectrum of muon ionization losses Nµ(ζ), measured at sea level (histogram in Fig. a), and its integral form Nµ(≥ ζ) (b) in relative units. Parameter ζ = ε/εpr, where εpr is the probable energy loss. Straight lines in Fig. a show the half-width of the distribution ∆ζ = ∆ε = 0.52. The straight line in Fig. b corresponds to <ζ> = 0.41.

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5. Fig. 4. The same as in Fig. 2, but for 55 MGA events. In Fig. 4, b — exp(–T/) corresponds to = 31 K.

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