Correlated p-N Pairs From 4He Photodisintegration With Tagged Photons From 80 to 131 MeV

High energy physics, Nuclear physics and radiation

Doran, Sean Michael

University:University of Glasgow

关键词: High energy physics, Nuclear physics and radiation;   

Others  :  http://theses.gla.ac.uk/74546/1/10992165.pdf

来源: University of Glasgow

【 摘 要 】

Results are presented for measurements of the photodisintegation of 4He using tagged photons in the energy range 80-131 MeV. In this energy region, the dominant photon absorption process is thought to be the quasideuteron mechanism of Levinger. The data are compared with the predictions of this model and with phase space calculations. Considerable agreement with the quasi-deuteron model is demonstrated. Two detector arrays were used in this measurement, one for the detection and identification of protons, and the other for the detection and identification of protons and neutrons. This allows separation of the 4He (gamma,pn) events from 4He (gamma,pp) events. Furthermore, the energy resolution is sufficiently good to enable separation of the 4He (gamma,pn)d and 4He (gamma,pn)pn decay channels, on the basis of their differing missing energies.