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The solid state particle detector and the Be⁹ (d,a) Li⁷ reaction

University of British Columbia

The important characteristics (the window thickness and energy linearity range) of an RCA type A solid state charged particle detector were measured for protons, tritons, and alpha particles. The window thickness varies from 150 Kev for protons to 1.00 Mev for alpha particles. The maximum energy of the linearity range varies from 5 Mev for protons to 20 Mev for alpha particles. The RCA detector was then used to study the reaction products from bombarding Be⁹ with .500 to 1.35 Mev deuterons. The following reactions were studied in detail: (i) the angular distribution of the alpha particle transition to the ground (a₁) and first (a₂) excited state of Li⁷ in the reaction Be⁹ (d,a)Li⁷ . The ground state transition fits an analytical curve of the type: a+ bcosθ + c cosθ², where θ is the angle of emission in the centre of mass coordinates of the reaction products. The ratio a:b:c is approximately: (1): (-.7): (.5). Neglecting the minimum near 150 degrees in the a₂ distribution, if fits a curve of the type a + bcosθ + c cos²θ where a:b:c is approximately (1):(.4): (.15). (ii) the angular distribution of the triton transition to the ground state of Be⁸ in the reaction Be⁹(d,t)Be⁸. An indication of an alpha transition to a 5.64 ± .11 Mev excited state in Li⁷ was found. No indication of a 6.5 Mev level in Li⁷ was found. Included as an appendix in this report, is a description of the recently installed Corona Stabilizer. The Corona Stabilizer supplies the feedback control that stabilizes the Van de Graaff accelerator energy at any set value.

Text

2011-11-28

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http://hdl.handle.net/2429/39300

Physics

University of British Columbia

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