Nuclear bremsstrahlung from 140 MeV protons

Proton-deuteron bremsstrahlung at 145 and 195 MeV

“…The value for the total cross section at 145 MeV is 21+2 pb, which is 4.7 times greater than the value reported y Edgington and Rose at 140 MeV [9]. It is also higher than the estimated value of 12 pb, which is based on the cross section of 26 pb reported by Rothe, Koehler, and Table I. Recent calculations on free pny by Herrmann, Speth, and Nakayama [21] use a meson-exchange potential model, and they also give a careful treatment of one-body rescattering.…”

“…TABLE I. Comparison of the total cross section for gamma rays above 40 MeV from proton-induced reactions on deuterium at incident energies of 140 [9], 145, 148 [18], 195, 197 [16], and 200 MeV [11] [9] present data [18] present data [16] [11] [15]. This forward peaking in the emitting frame may be due to the asymmetry of the collision, since in heavy-ion collisions it is generally believed that the reaction mechanism is incoherent proton-neutron bremsstrahlung and in these reactions there is an average over protons from the target colliding with projectile neutrons and vice versa.…”

“…Previously, there have been three pdy measurements reported in the literature [9,16,17] Edgington and Rose [9] used a 140 MeV proton beam at Harwell to study inclusive photon production. In this measurement they employed a (DzO-HzO) subtraction and obtained a poor resolution gamma ray energy spectrum.…”

High energy gamma ray production in proton-induced reactions at 104, 145, and 195 MeV

“…The energy spectra for the Edgington-Rose data [13] as well as those of Kwato Njock et al [14] and Pinston et al [15] are plotted in Fig. 4 [14] at 72 MeV, Edgington and Rose [13]at 140 MeV, and Pinston et al [15]at 168 MeV vs a reduced variable E /E, which is the measured gamma ray energy divided by the incident proton energy. quantitative approach to explore the discrepancies between the Edgington-Rose cross sections and the other measurements is to compare the total cross section above a low energy threshold.…”

“…Experimental data in this area have been sorely lacking until recently. The first systematic study of target and angle dependence of high energy gamma ray production in proton-nucleus reactions was completed by Edgington and Rose [13]. In this work 140 MeV protons were incident on various targets ranging from deuterium to lead.…”