Abstract
The predicted improvement that one expects for the performance of an extended air shower array from placing thin sheets of lead over each of its detectors, has been studied by a Monte Carlo method. The determination of shower direction, shower size and shower age has been investigated under this aspect. For showers at the energy threshold of the array, the simulation predicts an improvement of about 60% in the angular resolution. The optimum thickness is found to be about 5 mm. This value is shown to yield a 10% enhancement in the overall array efficiency. The accuracy in the fetermination of shower size and shower age cannot be fully maintained at the same time. However, with this value for the lead thickness, the deterioration in shower size resolution is found to be less than 20%, whereas the resolution in shower age remains nearly unaffected, provided a lateral correction function is applied, which accounts for systematic effects due to the modified response of the shielded detectors.
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