An experiment to investigate the existence of charged particles of mass ~550 me

Prasad, N. Durga ; Menon, M. G. K. ; Sharma, O. P. (1959) An experiment to investigate the existence of charged particles of mass ~550 me IL Nuovo Cimento (1955-1965), 14 (6). pp. 1332-1341.

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Evidence suggesting the existence of charged particles of mass ~550 me has been reported by Alikhanian, Sostakovic, Dadaian, Fedorov and Deriagin. A search has been made for these particles in a photographic emulsion stack exposed for five months at an altitude of 11 000 ft, λ= 24° N at Khillanmarg (Kashmir). The central plate of the stack was scanned for all tracks, with dip angles <45°, due to particle’s brought to rest within it. A total of 5790 tracks was obtained in this scan. Of these tracks, 2613 were due to particles, with ranges <5 mm, emerging from nuclear disintegrations; these were not considered further. Mass measurements were carried out on the remaining 3177 tracks by the grain density vs. residual range method; the range interval involved is (3÷40) g/cm2. The 3177 tracks investigated were found to be due to 1018 μ-mesons, 168 π-mesons and 1991 particles of mass ≥850 me. No particle with a mass estimated to be between 390 me and 850 me has been observed. Five such particles are to be expected on the abundance of ~½ % compared to μ-mesons (in the same range interval) quoted by Alikhanian et al. The question of the existence of such particles is discussed in the light of this and other experiments.

Item Type:Article
Source:Copyright of this article belongs to Italian Physical Society.
ID Code:20366
Deposited On:20 Nov 2010 14:36
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