نتایج جستجو برای: deuteron interaction
تعداد نتایج: 568081 فیلتر نتایج به سال:
An enhancement of antiprotons produced in p+ d reaction in comparison with ones in p+p elementary reaction is investigated. In the neighborhood of subthreshold energy the enhancement is caused by the difference of available energies for antiproton production. The cross section in p+ d reaction, on the other hand, becomes just twice of the one in elementary p+ p reaction at the incident energy f...
An analysis of incoherent photoproduction of η mesons off the deuteron for photon energies from threshold to 800 MeV is presented. The dominant contribution , the γN-ηN amplitude, is described within an isobar model. Effects of the final state interactions in the N N as well as the ηN systems are included employing models derived within the meson-exchange approach. It is found that their consid...
In a series of experiments coherent and quasifree η-photoproduction from light nuclei (He, He, H) was investigated with the TAPS-detector at the Mainz MAMI-accelerator. The experiments were motivated by two different subjects: the determination of the isospin structure of the electromagnetic excitation of the S11(1535) resonance and the study of the η-nucleon and η-nucleus interaction at small ...
An effective field theory with hadrons and photons is constructed, where the hadronic parameters are determined by fitting elastic πN scattering data. The predicted pioninduced η-production on the nucleon agrees well with the data. The hadronic model is then used to describe the final-state interaction in photoinduced processes. We present a consistent description of pion photoproduction in the...
A new measurement of the p-d differential cross section at Ep = 1 MeV has been performed. These new data and older data sets at energies below the deuteron breakup are compared to calculations using the two–nucleon Argonne v18 and the three–nucleon Urbana IX potentials. A quantitative estimate of the capability of these interactions to describe the data is given in terms of a χ analysis. The χ ...
The solution for the nucleon-nucleon (NN) T matrix in the framework of the covariant Bethe-Salpeter approach for a two spin-one-half particle system with a separable kernel of interaction is analyzed. The explicit analytical connection between parameters of the separable kernel and low energy scattering parameters, deuteron binding energy and phase shifts is established. Covariant separable ker...
The root mean square (rms) radius is used in many fields of physics to characterize the size of quantum systems; this observable is thus of special interest. In the case of two-body systems, the rms radius and the energy of one eigenstate determine the depth and the range of the central potential which binds the particles provided that the number of bound states supported by the potential is al...
We study the effects that a non zero strong-CP-violating parameter θ would have on the deuteron and diproton binding energies and on the triple-alpha process. Both these systems exhibit fine tuning, so it is plausible that a small change in the nuclear force would produce catastrophic consequences. Such a nuclear force is here understood in the framework of an effective Lagrangian for pions and...
The first conclusive evidence of a dipole resonance in ^{11}Li having isoscalar character observed from inelastic scattering with a novel solid deuteron target is reported. The experiment was performed at the newly commissioned IRIS facility at TRIUMF. The results show a resonance peak at an excitation energy of 1.03±0.03 MeV with a width of 0.51±0.11 MeV (FWHM). The angular distribution is con...
Incoherent η-photoproduction on the deuteron is studied for photon energies from threshold up to 720 MeV. The elementary γN → ηN amplitude is constructed in the frame of a conventional isobar model. Effects of final state interaction are investigated and their role in the cross section as well as in polarization observables is found to be important. Inclusion of such effects leads to a satisfac...
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