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Studies on muon showers underground

Journal Article:

Abstract

The 4 m/sup 2/ spark chamber telescope array of the Mt. Cappuccini Laboratory, Torino, At 40 m w.e. underground was operated for about 830 h recording muon showers. The data were analysed with respect to the multiplicity distribution of the shower particles, and to local interactions initiated in the chamber absorbers. Regarding the multiplicity analysis a semi-empirical expression for the likely shower size dependence of a structure function of the analytical form proposed by Vernov et al., was derived and applied with systematically varied parameters. The comparison of the observed rates of multiples with those calculated with a variety of parameters showed that a satisfactory agreement can be attained only if one admits a variation with the shower size of the parameters, and an enhanced muon/electron ratio at the lower primary energies, possibly indicative of an increased abundance of primary heavy nuclei. This would conform with the idea of a two-component primary composition in which a pulsar-produced fraction, enriched in heavy nuclei, dominated only at medium energies. The records on multiplicative interactions, and on large-angle scattering, were analysed by comparing their rates observed for shower particles with those found in single-muon check runs. The results are consistent with the assumption  More>>
Authors:
Bergamasco, L; Castagnoli, C; Dardo, M; D'Ettorre Piazzoli, B; Mannocchi, G; [1]  Picchi, P; Visentin, R; [2]  Sitte, K [3] 
  1. Consiglio Nazionale delle Ricerche, Turin (Italy). Lab. di Cosmo-Geofisica
  2. Comitato Nazionale per l'Energia Nucleare, Frascati (Italy). Laboratori Nazionali di Frascati
  3. Freiburg Univ. (Germany, F.R.). Fakultaet fuer Physik
Publication Date:
Aug 21, 1976
Product Type:
Journal Article
Reference Number:
AIX-08-326601; EDB-77-148699
Resource Relation:
Journal Name: Nuovo Cim., A; (Italy); Journal Volume: 34:4; Other Information: 26 refs
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COSMIC SHOWERS; CHEMICAL COMPOSITION; FLUX DENSITY; MUONS; FLUCTUATIONS; MULTIPLICITY; SPARK CHAMBERS; SPATIAL DISTRIBUTION; STRUCTURE FUNCTIONS; UNDERGROUND; COSMIC RADIATION; DISTRIBUTION; ELEMENTARY PARTICLES; FERMIONS; FUNCTIONS; GAS TRACK DETECTORS; IONIZING RADIATIONS; LEPTONS; LEVELS; MEASURING INSTRUMENTS; RADIATION DETECTORS; RADIATIONS; SECONDARY COSMIC RADIATION; SHOWERS; VARIATIONS; 645102* - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties; 640101 - Astrophysics & Cosmology- Cosmic Radiation
OSTI ID:
7297789
Country of Origin:
Italy
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: NCIAA
Submitting Site:
INIS
Size:
Pages: 613-638
Announcement Date:
Oct 01, 1977

Journal Article:

Citation Formats

Bergamasco, L, Castagnoli, C, Dardo, M, D'Ettorre Piazzoli, B, Mannocchi, G, Picchi, P, Visentin, R, and Sitte, K. Studies on muon showers underground. Italy: N. p., 1976. Web.
Bergamasco, L, Castagnoli, C, Dardo, M, D'Ettorre Piazzoli, B, Mannocchi, G, Picchi, P, Visentin, R, & Sitte, K. Studies on muon showers underground. Italy.
Bergamasco, L, Castagnoli, C, Dardo, M, D'Ettorre Piazzoli, B, Mannocchi, G, Picchi, P, Visentin, R, and Sitte, K. 1976. "Studies on muon showers underground." Italy.
@misc{etde_7297789,
title = {Studies on muon showers underground}
author = {Bergamasco, L, Castagnoli, C, Dardo, M, D'Ettorre Piazzoli, B, Mannocchi, G, Picchi, P, Visentin, R, and Sitte, K}
abstractNote = {The 4 m/sup 2/ spark chamber telescope array of the Mt. Cappuccini Laboratory, Torino, At 40 m w.e. underground was operated for about 830 h recording muon showers. The data were analysed with respect to the multiplicity distribution of the shower particles, and to local interactions initiated in the chamber absorbers. Regarding the multiplicity analysis a semi-empirical expression for the likely shower size dependence of a structure function of the analytical form proposed by Vernov et al., was derived and applied with systematically varied parameters. The comparison of the observed rates of multiples with those calculated with a variety of parameters showed that a satisfactory agreement can be attained only if one admits a variation with the shower size of the parameters, and an enhanced muon/electron ratio at the lower primary energies, possibly indicative of an increased abundance of primary heavy nuclei. This would conform with the idea of a two-component primary composition in which a pulsar-produced fraction, enriched in heavy nuclei, dominated only at medium energies. The records on multiplicative interactions, and on large-angle scattering, were analysed by comparing their rates observed for shower particles with those found in single-muon check runs. The results are consistent with the assumption that all shower particle interactions are electromagnetic in nature, and that nonconventional components like mandelas are absent. Only making extreme allowances for statistical fluctuations the data can be made compatible with a mandela flux as large as that suggested by Baruch et al., provided that the mandela attenuation length is less than 1 500g/cm/sup 2/ of rock.}
journal = {Nuovo Cim., A; (Italy)}
volume = {34:4}
journal type = {AC}
place = {Italy}
year = {1976}
month = {Aug}
}