New data on the giant dipole resonance in $^{40}$Са
New data on the giant dipole resonance in $^{40}$Са
A.S. Gabelko, M.Kh. Zhalilov, B.S. Ishkhanov, I.M. Kapitonov, I.M. Piskarev
New data are presented on the partial decay channels for the giant dipole resonance (GDR) of $^{40}$Са. In all, information has been obtained on 33 partial photoreaction channels, of which 16 have not been observed before. In particular, information has been obtained on the reactions $(\gamma, 2p_{i})$, $(\gamma, \tau_{i})$, and $(\gamma, \alpha_{i})$. A study is made of the isospin purity of the GDR states. It is found that the mixing of $T=0$ states with $T=1$ ones in the region of the GDR maximum does not exceed 2-3%. The proportions of the semidirect components in the partial photonucleon cross sections have been determined and in the cross section for photoabsorption by $^{40}$Са (the value is 0.55 for the latter).
Show AbstractThe fission time for excited $^{238}$Np
The fission time for excited $^{238}$Np
O.V. Grusha, Yu.V. Melikov, S.Yu. Platonov, A.F. Tulinov, O.A. Yuminov
The shadow method has been used to examine the fission time for $^{238}$Nр formed by deuteron absorption by $^{238}$U and subsequent emission of two neutrons. The analysis is based on the two-hump fission-barrier model. It is shown that the transition-state lifetimes made a substantial contribution to the fission time for $^{238}$Np.
Show AbstractThe proton optical potential for $^{53}$Cr at low and medium energies
The proton optical potential for $^{53}$Cr at low and medium energies
E.A. Rornanovskii
Parameters have been determined for the optical potential OP providing close reproduction of the observed differential cross sections for elastic scattering and polarization, as well as the energy dependence of the total reaction cross section. The energy dependence has been determined for the proton OP parameters for $^{53}$Cr, as well as the energy dependence of the elastic-scattering cross section involving the compound nucleus and the dependence of the exchange integral for the imaginary potential per nucleon on the incident-proton energy.
Show AbstractA three-body approach to charged-particle transfer reactions in nuclear and atomic physics
A three-body approach to charged-particle transfer reactions in nuclear and atomic physics
G.V. Avakov, A.R. Ashurov, L.D. Blokhintsev, A.M. Mukhamedzhanov, D. A. Savin
Faddeev's equations have been modified to incorporate the Coulomb interaction in order to calculate the cross sections for nucleon $N$ stripping reactions $d + A \rightarrow N + B$. It is found that the proton-transfer cross section is larger than the neutron one. Analogous equations are used to describe electron transfer in ion-atom collisions. Total cross sections have been calculated for these reactions produced by ions with charges $Z=1-6$ at hydrogen and helium atoms, which agree satisfactorily with experiment.
Show AbstractDirect and resonant nuclear shattering by intermediate-energy hadrons (Doppler effect)
Direct and resonant nuclear shattering by intermediate-energy hadrons (Doppler effect)
V.V. Balashov, V.K. Dolinov, V.L. Korotkikh, D.E. Lanskoi
A study is made of scope for using coincidences between scattered particle and the $\gamma$ ray from the daughter nuclide to measure the shape of the Doppler line in research on the shattering mechanism.
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