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• W2051463932 endingPage "567" @default.
• W2051463932 startingPage "556" @default.
• W2051463932 abstract "The differential cross sections for the reactions $^{63,65}mathrm{Cu}(t,p)^{65,67}mathrm{Cu}$ were measured at ${E}_{t}=3.2, 3.0, mathrm{and} 2.8$ MeV. For $L=0$ ground-state transitions, the energy dependence of the values of the differential cross sections is strong and exponential, while the angular distribution shape, which is of a clear diffraction pattern in sharp contrast to the case of the sub-Coulomb ($d,p$) reaction, does not change with small energy variation. The reactions proceed well below the Coulomb barrier of the entrance channel, yet through a direct process. A definite difference is observed between the angular distributions for the two ground-state transitions. The zero-range distorted-wave Born approximation can reproduce the energy dependence of the differential cross sections and the trend of isotope dependence of the angular distribution. In distorted-wave Born approximation calculations, a definite nuclear optical potential is needed for the triton-nucleus channel which is below the Coulomb barrier, in sharp contrast to the sub-Coulomb ($d,p$) reaction. The triton-nucleus optical potential below the Coulomb barrier is nearly equal to the optical potential that works at energies of a few tens of MeV. The angular distribution for an $L=2$ transition is forward-rising, though not diffractionlike, and can be reproduced on the whole by the zero-range distorted-wave Born approximation. It is confirmed for the first time that the ($t,p$) reaction below the Coulomb barrier of the entrance channel takes place in an extended region outside the nucleus. It is argued and concluded on various grounds that the ($t,p$) angular distribution shape below the Coulomb barrier of the entrance channel is sensitive to the radial two-neutron from factor outside the nucleus. Physical implications of the revealed features are discussed, especially on the coherence of the two-particle form factor and the proton and neutron distributions in the nuclear surface region.NUCLEAR REACTIONS $^{63,65}mathrm{Cu}(t,p)$, $E=2.8, 3.0, 3.2$ MeV; measured $ensuremath{sigma}(E;ensuremath{theta})$; DWBA analysis. Enriched $^{63}mathrm{Cu}$, natural Cu targets, resolution 200 keV; $ensuremath{theta}=10ensuremath{-}165ifmmode^circelsetextdegreefi{}$. Revealed features below the Coulomb barrier, sensitivity to the form factor." @default.
• W2051463932 created "2016-06-24" @default.
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• W2051463932 date "1976-02-01" @default.
• W2051463932 modified "2023-10-03" @default.
• W2051463932 title "Features of the (t,p) reaction below the Coulomb barrier of the entrance channel" @default.
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• W2051463932 doi "https://doi.org/10.1103/physrevc.13.556" @default.
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