0000000000765488
AUTHOR
K. Mengel
In-medium modifications of the pi pi interaction in photon-induced reactions
Differential cross sections of the reactions $(\gamma,\pi^\circ\pi^\circ)$ and $(\gamma,\pi^\circ\pi^++\pi^\circ\pi^-)$ have been measured for several nuclei ($^1$H,$^{12}$C, and $^{\rm nat}$Pb) at an incident-photon energy of $E_{\gamma}$=400-460 MeV at the tagged-photon facility at MAMI-B using the TAPS spectrometer. A significant nuclear-mass dependence of the $\pi\pi$ invariant-mass distribution is found in the $\pi^\circ\pi^\circ$ channel. This dependence is not observed in the $\pi^\circ\pi^{+/-}$ channel and is consistent with an in-medium modification of the $\pi\pi$ interaction in the $I$=$J$=0 channel. The data are compared to $\pi$-induced measurements and to calculations within …
Crustal xenoliths from Cenozoic volcanic fields of West Germany: Implications for structure and composition of the continental crust
Crustal xenoliths in three Cenozoic volcanic fields of West Germany, the Northern Hessian Depression (NHD), the Eifel and the Urach/Hegau, include medium to high-grade meta sedimentary and felsic to mafic meta-igneous rocks. Also present in all three suites are pyroxenites and hornblendites. For each volcanic field, a model crustal profile is proposed based on calculated or measured P-wave velocities of xenoliths and depth-Vp relationships (EGT Central Segment and Rhenish Massif traverses). The xenolith lithologies from the NHD and the Eifel show some similarities. The middle crust between the depths of about 10 and 25 km consists mainly of meta-sediments, felsic gneisses and granulites. Me…
The Reactionγp→π0γ′pand the Magnetic Dipole Moment of theΔ+(1232)Resonance
The reaction $\ensuremath{\gamma}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\gamma}}^{\ensuremath{'}}p$ has been measured with the TAPS calorimeter at the Mainz Microtron accelerator facility MAMI for energies between $\sqrt{s}=1221--1331\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}$. The cross section's differential in angle and energy have been determined for the photon ${\ensuremath{\gamma}}^{\ensuremath{'}}$ in three bins of the excitation energy. This reaction channel provides access to the magnetic dipole moment of the ${\ensuremath{\Delta}}^{+}(1232)$ resonance and, for the first time, a value of ${\ensuremath{\mu}}_{{\ensuremath{\Delta}}^{+}}=\mathbf{[}{2.7}_{\ensu…
"Table 6" of "In-medium modifications of the pi pi interaction in photon-induced reactions."
Differential cross section for PI0PI+/- production with a Lead target. Errors are statistical only.
"Table 2" of "In-medium modifications of the pi pi interaction in photon-induced reactions."
Differential cross section for PI0PI0 production with a Carbon target. Errors are statistical only.
"Table 1" of "In-medium modifications of the pi pi interaction in photon-induced reactions."
Differential cross section for PI0PI0 production with a proton target. Errors are statistical only. Note that the data given in this table are sightly different (newer) than the data points presented in the paper.
"Table 4" of "In-medium modifications of the pi pi interaction in photon-induced reactions."
Differential cross section for PI0PI+ production with a proton target. Errors are statistical only. Note that the data given in this table are sightly different (newer) than the data points presented in the paper.
"Table 3" of "In-medium modifications of the pi pi interaction in photon-induced reactions."
Differential cross section for PI0PI0 production with a Lead target. Errors are statistical only.
"Table 5" of "In-medium modifications of the pi pi interaction in photon-induced reactions."
Differential cross section for PI0PI+/- production with a Carbon target. Errors are statistical only.