Bremsstrahlung emission accompanying the α -decay of 214Po

New approach to determine proton-nucleus interactions from experimental bremsstrahlung data

“…Note that in calculations of the bremsstrahlung emission in the α decay we obtained the shape of the logarithmic type without such a humped-shaped form (here we achieved the most accurate agreement between our calculations [43][44][45] and the existing experimental data [32,33,44,45], a similar situation is observed also for fission [31]). Now it becomes clear that the absence of such humped-shaped spectra for the α decay is explained by zero spin of the α particle, and the resulting zero matrix elements in Eqs.…”

“…After a comparison of the calculations with experimental data, we observe a difference between their shapes. In particular, in the calculated spectra we obtain the shape of logarithmic type, which is typical for the bremsstrahlung emission in the α decay and fission (and here we obtained the most accurate agreement between calculations and the existed experimental data, see [43][44][45] and [63] for details). At the same time, experimental data [1, 6,9] have some different behavior with a little visible hump-shaped form inside 60-100 MeV [this is more clearly visible in Fig.…”

“…On such a basis we can consider such an emission of the bremsstrahlung photons as some new type of emission, which can be named the bremsstrahlung emission on the basis of spin-internal nucleons momenta interactions. Introduction of such a type of emission allows us for the first time to explain the origin (presence) of the hump-shaped plateau in the bremsstrahlung spectra for the proton-nucleus scattering, and, at the same time, the absence of such a plateau in the spectra for the α decay (see data from [32,33] and [43][44][45]). Also we find that the optical model of the scattering of protons off nuclei does not include such a term of interactions.…”

“…In this paper we presented the new developments of our model of the bremsstrahlung emission (presented previously in [28,31,[42][43][44][45][46][47][48]63]) which accompanies the scattering of protons off nuclei at low and intermediate energies of the emitted photons. In the analysis we studied the scattering of p+ 208 Pb at the proton incident energies of E p = 140 and 145 MeV, the scattering of p + 12 C, p + 58 Ni, p + 107 Ag, and p + 197 Au at the proton incident energy of E p = 190 MeV.…”

“…We shall include many-nucleon structure into the wave function ψ nucl,s (β A ) of the nucleus while we assume that the wave function of relative motion ψ p−nucl,s (r) is calculated without it but with maximal orientation of the proton-nucleus potential well extracted from experimental data of proton-decay and proton-nucleus scattering (many-nucleon corrections in it can be taken into account in the next step, perturbatively). Such a line allows us to keep accurately the wave function of relative motion which provides the leading contribution to the bremsstrahlung spectrum, while many-nucleon structure should be estimated after (such a supposition we made from good agreement between theory and experiment for α decay which was obtained without nucleon structure in [42][43][44][45][46][47][48]). …”