Absence of Cosmic Rays from Nova Lacertæ

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THE appearance of Nova Lacertæ gave us a second opportunity of investigating whether the conclusion at which we arrived when investigating the relation of Nova Herculis to cosmic rays1, namely, that no cosmic rays emitted from novæ are observable, was correct or not. For this purpose we have turned the centre line of the field of our apparatus (field of the apparatus: 40° in east-west, 10° in north-south direction; 36 cm. lead between the counters) as soon as the outburst of the nova was signalled, into such a position that the centre line showed only an angle of 2° 09 north of the nova at culmination. In such a position a set of measurements was performed from June 19 until July 17, 1936.

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  1. 1

    J. Barnóthy and M. Forró, NATURE, 135, 618 (1935). Z. Phys., 94, 773 (1935). NATURE, 136, 680 (1935).

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