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Il Nuovo Cimento B (1965-1970)

, Volume 55, Issue 2, pp 451–475 | Cite as

On the detection and measurement of cosmic-ray electrons

  • C. J. Bland
  • G. Boella
  • G. Degli Antoni
  • C. Dilworth
  • L. Scarsi
  • G. Sironi
  • B. Agrinier
  • Y. Koechlin
  • B. Parlier
  • J. Vasseur
Article

Summary

The flux and the east-west asymmetry of the primary cosmic-ray electrons have been investigated at a geomagnetic cut-off rigidity of 5.36 GV, during the period November 1963–September 1965. Four successful balloon flights of a small multiplate spark chamber containing 5 radiation lengths of lead have been carried out. A value for the integral flux of primary electronsF(≥5.4 GeV)=(5.3±0.5) m−2 s−1 sr−1, and an east-west asymmetry coefficient for observations at 38° to the verticalA=2(FWFE)/(FW+FE)=−(0.41±0.21) have been obtained. It is shown that this asymmetry coefficient indicates that the major fraction of the primary electrons, in the energy region 4.6 GeV≤E≤6.5 GeV, is negative in charge. In this energy interval the differential flux of the negative excess is (1.2±0.6) · 10−3 m−2 s−1 sr−1 MeV−1, assuming the calculated values for the geomagnetic cut-off.

Keywords

Electron Shower Asymmetry Coefficient Integral Flux Atmospheric Depth Differential Flux 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

О детектировании и иэмерении злектронов в космических лучах

Реэюме

Были исследованы поток и восточно-эападная асимметрия первичных злектронов в космических лучах при геомагнитной обреэанной жесткости 5.36 GV, в течении периода ноябрь 1963 — сентябрь 1965. Были проведены четыре последовательных полета баллонов с маленькой многопластинной искровой камерой, содержашей 5 радиационных длин свинца. Были получены: величина для интегрального потока злектроновF(⩾5.4 ГзВ)=(5.3±0.5)м−2сек−1 стерад−1, и козффициент восточно-эападной асимметрии для наблюдений при 38 к вертикалиA= 2(F W F E )/(F W +F E )=− (0.41±0.21). Покаэывается, что зтот козффициент асимметрии укаэывает, что основная часть первичных злектронов, в области знергий 4.6 ГЗВ⩽E⩽6.5 ГзВ, имеет отрицательный эаряд. В зтом интервале знергий дифференциальный поток отрицательного иэбытка составляет (1.2±0.6)·10−3м−2 сек−1··стерад−1 МзВ−1, предполагая вычисленные величины для геомагнитного обреэания.

Riassunto

Si sono studiati il flusso e l’asimmetria est-ovest degli elettroni presenti nella relazione cosmica primaria, per una rigidità geomagnetica di taglio di 5.36 GV, nel periodo Novembre 1963-Settembre 1965. Quattro voli in pallone di una piccola camera a scintilla a più setti, per un totale di 5 lunghezze di radiazione in piombo, sono stati compiuti ottenendoF(≥5.4 GeV)=(5.3±0.5) m−2 s−1 sr−1 per il valore dal flusso integrale di elettroni primari, eA=2(FwFE)/(Fw+FE)=−(0.41±0.21) per il coefficiente di asimmetria est-ovest per osservazioni a 38o della verticale. Si mostra che questo coefficiente di asimmetria indica che la frazione dominante degli elettroni primari presenta carica negativa, nella regione di energia 4.6 GeV≤E≤6.5 GeV. In questo intervallo di energia il flusso differenziale dell’eccesso negativo risulta (1.2±0.6) · 10−3 m−2 s−1 sr−1 MeV−1, adottando per il taglio geomagnetico i valori calcolati.

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Copyright information

© Socictà Italiana di Fisica 1968

Authors and Affiliations

  • C. J. Bland
    • 1
    • 2
  • G. Boella
    • 1
    • 2
  • G. Degli Antoni
    • 1
    • 2
  • C. Dilworth
    • 1
    • 2
  • L. Scarsi
    • 1
    • 2
  • G. Sironi
    • 1
    • 2
  • B. Agrinier
    • 3
  • Y. Koechlin
    • 3
  • B. Parlier
    • 3
  • J. Vasseur
    • 3
  1. 1.Istituto di Scienze Fisiche dell’UniversitàMilano
  2. 2.Gruppo GIFCO del Consiglio Nazionale delle RicercheMilano
  3. 3.Service d’Eléctronique PhysiqueCentre d’Etudes Nucléaires de SaclayGif-sur-Yvette, Essonne

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