312 Relativ. Massenzuwachs: Unterschied zwischen den Versionen
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Fast, relativistic electrons from beta decays of 90Sr (strontium) and the subsequent 90Y (yttrium, Emax = 2.27MeV) are analyzed using a simple beta spectrometer. The electrons are injected into a nearly homogeneous magnetic field, which exists between a pair of permanent-magnetic plates, and deflected in a semicircular manner. From the point where the electrons leave the magnetic field, the momentum of the electrons can be determined. The corresponding energies of the electrons are determined with a CsI scintillation detector, which must be calibrated beforehand with standard samples, a subsequent amplifier and an ADC. After taking into account the energy loss of the electrons in air and in the window of the CsI scintillator, the experimentally determined energy-momentum value pairs are plotted graphically with error bars and compared in the same diagram with the calculated energy-momentum curves of the classical and the relativistic theory. | Fast, relativistic electrons from beta decays of 90Sr (strontium) and the subsequent 90Y (yttrium, Emax = 2.27MeV) are analyzed using a simple beta spectrometer. The electrons are injected into a nearly homogeneous magnetic field, which exists between a pair of permanent-magnetic plates, and deflected in a semicircular manner. From the point where the electrons leave the magnetic field, the momentum of the electrons can be determined. The corresponding energies of the electrons are determined with a CsI scintillation detector, which must be calibrated beforehand with standard samples, a subsequent amplifier and an ADC. After taking into account the energy loss of the electrons in air and in the window of the CsI scintillator, the experimentally determined energy-momentum value pairs are plotted graphically with error bars and compared in the same diagram with the calculated energy-momentum curves of the classical and the relativistic theory. | ||
Version vom 27. November 2023, 10:07 Uhr
312 Relativistischer Massenzuwachs
Schnelle relativistische Elektronen aus den Beta Zerfällen des 90Sr (Strontium) und des nachfolgenden 90Y (Yttrium Eβ,max = 2,27 MeV) werden mit Hilfe eines einfachen Betaspektrometers analysiert. Dabei werden die Elektronen in ein nahezu homogenes Magnetfeld (B = 1,0 kG = 0,10 T), das zwischen einem permanent-magnetischen Plattenpaar (230 x 200 x 28) mm³ besteht, hineingeschossen und halbkreisförmig abgelenkt. Aus dem Austrittsort der Elektronen aus dem Magnetfeld lässt sich der Impuls der Elektronen ermitteln. Die zugehörige Energie der Elektronen wird mit einem CsI-Szintillationsdetektor, der vorher mit Standardpräparaten geeicht werden muss, mit Hilfe eines Vielkanalanalysators, bestehend aus ADC und PC, gemessen. Nach Korrektur der Energieverluste der Elektronen in Luft und im Al-Fenster des Szintillationsdetektors, werden die experimentell bestimmten Wertepaare Energie und Impuls graphisch mit Fehlerbalken dargestellt und im gleichen Diagramm mit den berechneten Energie-Impuls-Kurven für den nicht-relativistischen und den relativistischen Fall verglichen.
Der Versuch findet im F-Praktikums-Raum NB 04/286 statt. Anleitung
312 Relativistic mass increase
Fast, relativistic electrons from beta decays of 90Sr (strontium) and the subsequent 90Y (yttrium, Emax = 2.27MeV) are analyzed using a simple beta spectrometer. The electrons are injected into a nearly homogeneous magnetic field, which exists between a pair of permanent-magnetic plates, and deflected in a semicircular manner. From the point where the electrons leave the magnetic field, the momentum of the electrons can be determined. The corresponding energies of the electrons are determined with a CsI scintillation detector, which must be calibrated beforehand with standard samples, a subsequent amplifier and an ADC. After taking into account the energy loss of the electrons in air and in the window of the CsI scintillator, the experimentally determined energy-momentum value pairs are plotted graphically with error bars and compared in the same diagram with the calculated energy-momentum curves of the classical and the relativistic theory.
The experiment takes place in the advanced lab room NB 04/286. Manual
