Direct-sequential order-of-emission interference effect

"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."

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year dc:date

2011

Author dc:creator

• Stotland, Victor G.

Contributors dc:contributor

• Allen, J.S.

• direct-sequential order-of-emission interference effect
• solid-state detectors
• Breit-Wigner line shapes

Statement dc:rights

• 1968 Victor G. Stotland

Language dc:language

en

Identifier

6083056

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/25745