Výsledky vyhledávání - "D. E. Alexandreas"

New limit on the rate-density of evaporating black holes

Publikováno v: Physical Review Letters. 71:2524-2527

Data taken with the CYGNUS detector between 1989 September and 1993 January have been used to search for 1 s bursts of ultrahigh-energy gamma rays from point sources at arbitrary locations in the northern sky. We find no evidence for such bursts. We

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3cece27a85122da4ea5a53503bb36d04
https://doi.org/10.1103/physrevlett.71.2524

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Point source search techniques in ultra high energy gamma ray astronomy

Autor: D. Berley, C. Sinnis, G. B. Yodh, G. M. Dion, J. A. Goodman, D. E. Alexandreas, T. J. Haines, S. D. Biller, X. Q. Lu, E. Horch, W. Zhang, C. M. Hoffman

Publikováno v: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 328:570-577

Searches for point astrophysical sources of ultra high energy (UHE) gamma rays are plagued by large numbers of background events from isotropic cosmic rays. Some of the methods that have been used to estimate the expected number of background events

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7611e0a1e9282768684825daf70bb04b
https://doi.org/10.1016/0168-9002(93)90677-a

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The CYGNUS extensive air-shower experiment

Publikováno v: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 311:350-367

The CYGNUS extensive air-shower experiment is described. The design criteria, construction and operation details, and performance characteristics are presented. A discussion of the data analysis techniques is given. Finally, several enhancements and

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8c95ba416b2c35de357bad798ae8ea07
https://doi.org/10.1016/0168-9002(92)90883-6

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Search for UHE emission from 4U0115+63

Publikováno v: AIP Conference Proceedings.

We report here the preliminary results of our observations of the sporadic X‐binary system 4U0115+63. The CYGNUS air shower array has been collecting data since April 1986. No significant excess is seen from the direction of this source, nor any co

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2730981fb2f036e69941f878b1182dda
https://doi.org/10.1063/1.40335

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Observation of shadowing of ultrahigh-energy cosmic rays by the Moon and the Sun

Publikováno v: Physical review. D, Particles and fields. 43(5)

Data from an extensive air shower detector of ultrahigh-energy cosmic rays shows shadowing of the cosmic-ray flux by the Moon and the Sun with significance of 4.9 standard deviations. This is the first observation of such shadowing. The effect has be

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e20f9040a6fa11576dad18c4f0e9a80a
https://pubmed.ncbi.nlm.nih.gov/10013548

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The showerfront time-structure of ‘‘anomalous muon’’ events associated with Hercules X-1

Publikováno v: AIP Conference Proceedings.

The 11 ‘‘in‐phase’’ source events from the 1986 muon‐rich bursts associated with Hercules X‐1 (previously reported by this group) have been studied for indications of further anomalous behavior. The most significant effect observed resu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::57e64c2f13e3cfb5b3ed2265450a6fab
https://doi.org/10.1063/1.40334

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UHE point source survey at Cygnus experiment

Publikováno v: AIP Conference Proceedings.

A new method of searching for UHE point source has been developed. With a data sample of 150 million events, we have surveyed the sky for point sources over 3314 locations (1.4°

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8ab4d4fb65a8e58b19a68946cea80db7
https://doi.org/10.1063/1.40332

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A search for UHE cosmic ray from the Crab pulsar/nebula

Publikováno v: AIP Conference Proceedings.

A preliminary search is made for continuously pulsed, and burst, emission from the Crab pulsar or its nebula at ultra‐high energies using the CYGNUS air shower experiment. No evidence is found for pulsed emission over the entire data set of 1,075 d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5164c3994b402e537f5761a4a41e02b6
https://doi.org/10.1063/1.40333

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Recent data from the CYGNUS experiment

Publikováno v: AIP Conference Proceedings.

Data from the CYGNUS extensive air shower experiment at Los Alamos, NM has been analyzed to study the angular resolution of the array, and to search for point sources in the galaxy. Results on searches for steady emission from Cyg X‐3, Her X‐1 an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a70edaf841a997df48e5fba008b60e1d
https://doi.org/10.1063/1.40328

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Study of Cygnus X-3 at ultrahigh energies during the 1989 radio outbursts

Publikováno v: Physical review letters. 64(25)

A unique feature of Cygnus X-3 is that occasionally it has large radio outbursts that begin very abruptly and last for several days. Several experiments in the past have claimed to observe signals above 1 TeV correlated with these radio bursts; the m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::25dcd8638590e16338201cc80e599b8a
https://pubmed.ncbi.nlm.nih.gov/10041862

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