Summary
The authors examine once more the effect of cosmic rays on a resonating gravitational-wave antenna in view of the very high sensitivities that are required for detecting the supernovae of the Virgo Cluster. They show that, at sea-level, the secondaries generated in the bar by the electromagnetic interaction of high-energy muons produce signals with rates much larger than that expected from supernovae. This inconvenience is eliminated in an underground laboratory.
Riassunto
Gli autori esaminano nuovamente l'effetto dei raggi cosmici su di una antenna gravitazionale risonante, in considerazione della elevata sensibilità che è necessario raggiungere per rivelare le supernovae del Virgo Cluster. Essi mostrano che al livello del mare i secondari generati nella sbarra dalla interazione electtromagnetica dei muoni di alta energia producono segnali con frequenza statistica maggiore di quella prevista per le supernovae. Questo inconveniente è eliminato in un laboratorio sotterraneo.
Резюме
В работе исследуется влияние космических лучей на резонансную антенну гравитационнын волн, в виду высокой чувствиельности, необходимой для детектирования сверхновых в созвездии Девы. Доказывается, что на уровне моря вторичные частицы, образованные в результате электромагнитного взаимодействия высокоэнергетических мюонов произодят сигналы с интенсивностями, много большими, чем ожидаемые интенсивности сигналов от сверхновых. Это противоречие устраняется в подземной лабоатории.
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We recall that the depth within which 50% (98%) of the incident energy is deposited, is given (inX 0 units) byt med=ln(W/ε)+a,\(t_{med} = \ln \left( {{W \mathord{\left/ {\vphantom {W \varepsilon }} \right. \kern-\nulldelimiterspace} \varepsilon }} \right) + a, a = \left\{ \begin{gathered} 0.4 for electrons, \hfill \\ 1.2 for \gamma - rays, \hfill \\ \end{gathered} \right.\) t 98%≅3t med, ε=critical energy
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Amaldi, E., Pizzella, G. Estimate of the background of a gravitational-wave detector due to cosmic rays. Il Nuovo Cimento C 9, 612–620 (1986). https://doi.org/10.1007/BF02514879
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DOI: https://doi.org/10.1007/BF02514879