DOUBLE CLOUD-CHAMBER INVESTIGATION OF 500 Me PARTICLES IN COSMIC RAYS
Journal Article
·
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
BS>The Princeton double cloud chamber was used to investigate the mass spectrum of long-lived cosmic particles between the mu -meson and the proton masses. It was operated at Echo Lake, Colorado (3250 nm altitude and 42 deg geomagnetic latitude) and at Princeton, New Jersey (sea level). The upper cloud chamber operated in a magnetic field of 5500 gauss. The lower chamber contained 7 copper plates of 1.27 cm thickness each. The range of a stopping particle was between 120 anmd 200 g/cm/sup 2/Cu equivalent. No production layer was used. At Echo Lake a water Cerenkov counter was included in the counter arrangement to bias against mu mesons. The mass of every stopping particle was determined from momentum and range. A measurement of tbe ionization by droplet counting was possible in the upper chamber. No particle of about 500 electron masses was found in either run as compared to an equivalent flux of about 1000 stopped mu mesons at Echo Lake and 1500 stopped mu mesons at Princeton. These results are in disagreement with the Alikhanian experiment. (auth)
- Research Organization:
- Univ. of Michigan, Ann Arbor
- NSA Number:
- NSA-16-003606
- OSTI ID:
- 4832087
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 124; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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