Enhancement of incoherent bremsstrahlung in proton-nucleus scattering in the $\Delta$-resonance energy region

Abstract

We investigate emission of the bremsstrahlung photons in the scattering of protons off nuclei at the $\Delta$-resonance energy region. Including properties of $\Delta$-resonance in the nucleus-target to the bremsstrahlung model, we find the following. (1) Ratio between incoherent emission and coherent emission is about $10^6$--$10^7$ for $p + \isotope[197]{Au}$ (without $\Delta$-resonance) at energy of proton beam $E_{\mathrm{p}}$ of 190~MeV, where the calculated full bremsstrahlung spectrum is in good agreement with experimental data. This confirms importance of incoherent processes in study of $\Delta$-resonances in this reaction, which have never been studied yet. We estimate coherent and incoherent contributions, electric and magnetic contributions, full bremsstrahlung spectra for the scattering of protons on the \isotope[12]{C}, \isotope[40]{Ca}, \isotope[208]{Pb} nuclei at $E_{\mathrm{p}}=800$~MeV, we find conditions for the most intensive bremsstrahlung emission. (2) Transition $pN\to {\Delta }^{+}N$ in the nucleus-target reinforces emission of bremsstrahlung photons in that reaction at $E_{\mathrm{p}}=800$~MeV. Difference between the spectra for normal nuclei and nuclei with included $\Delta$-resonance is larger for more light nuclei, but the spectra are larger for heavier nuclei. (3) Taking into account shortly lived state of $\Delta$-resonance, we find that the spectrum with $\Delta$-resonance in the nucleus-target is essentially larger in the high energy photon region than the spectrum without this $\Delta$-resonance (corresponding calculations for \isotope[12][Δ]{C}, \isotope[40][Δ]{Ca}, \isotope[208][Δ]{Pb} in comparison with \isotope[12]{C}, \isotope[40]{Ca}, \isotope[208]{Pb} are provided). Such an aspect is recommended for registration of $\Delta$-resonances in nuclei in possible future experiments.

24 pages, 9 captured figures, 2 appendixes

References in corpus (6)

• Electromagnetic two-body currents of one- and two-pion range
• Bremsstrahlung emission during $\alpha$-decay of ${}^{226}\mathrm{Ra}$
• Quantum design using a multiple internal reflections method in a study of fusion processes in the capture of alpha-particles by nuclei
• Model of the bremsstrahlung emission accompanying interactions between protons and nuclei from low up to intermediate energies: role of magnetic emission
• New quasibound states of the compound nucleus in $\alpha$-particle capture by the nucleus
• Nucleon microscopy in proton-nucleus scattering via analysis of bremsstrahlung emission

Cited by in corpus (3)

• Microscopic study of nuclei synthesis in pycnonuclear reaction ${}^{12}$C + ${}^{12}$C in neutron stars
• Bremsstrahlung emission accompanying ternary fission of \isotope[252]{Cf}
• Manifestation of quark effects in nuclei via bremsstrahlung analysis in the proton-nucleus scattering