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Title:Direct-sequential order-of-emission interference effect
Author(s):Stotland, Victor G.
Doctoral Committee Chair(s):Allen, J.S.
Department / Program:Physics
Subject(s):direct-sequential order-of-emission interference effect
solid-state detectors
Breit-Wigner line shapes
Abstract:The reaction 9Be(3He,a)8Be* -+ a + a has been studied at incident beam energies of 27.4 and 27.8 MeV. Two solid-state detectors were mounted in the reaction plane and set at such angles that the peak corresponding to the 9Be(3He,a)8Be(E . = excLt. 11.4 MeV) and the peak due to 8 Be(E .t = 11.4 MeV) -+ 2a, as eXCL. seen in a given detecto~ were superimposed over a wide angular range. The results show that for Ep = 27.8 MeV, 91 = 77°, 92 = 60° and for Ep = 27.4 MeV,91 = 80°, 92 = 59°, there is order-of-emission destructive interference, where a peak due to the superimposition of the two closely spaced peaks is expected. Assuming no interference is present the width of the 11. 4 MeV level of 8 Be"* as deduced from the separation of the two peaks, is less than 2.5 MeV, a value which is considerably smaller than the known width of 4.0 MeV. On the other han4 using coherent addition of two Breit-Wigner line shapes characterized by widths of 4.0 MeV, one can predict a dip between the two peaks that is in qualitative agreement with the experimental data.
Issue Date:1968
Genre:Dissertation / Thesis
Rights Information:1968 Victor G. Stotland
Date Available in IDEALS:2011-07-11
Identifier in Online Catalog:6083056

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