Angular and energy dependences of cross sections for deuteron electrodisintegration at subbarrier energies
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CLEI Theory
Angular and Energy Dependences of Cross Sections for Deuteron Electrodisintegration at Subbarrier Energies K. O. Terenetsky and V. P. Verbitsky Institute for Nuclear Research, National Academy of Sciences of Ukraine, pr. Nauki, Kiev, 03680 Ukraine Received May 16, 2005; in final form, August 29, 2005
Abstract—A method is proposed for analyzing a large set of spectra calculated for the Coulomb breakup of deuterons. The regularities in the behavior of the respective cross section as a function of the emission angles and energies of particles constituting the deuteron are studied on the basis of this method. The deuteron-breakup reaction on lead nuclei at an energy of Ed = 8 MeV is considered by way of example. It is shown that the approximate Landau–Lifshitz formulas for this process are unable to predict some of its features. An experiment is proposed for studying the physical nature of the Nemets effect. PACS numbers : 25.45.-z, 24.10.Eq DOI: 10.1134/S1063778806060044
Many processes in nuclear and atomic physics are studied against a dominant background of Coulomb interaction. These include bremsstrahlung [1], Coulomb excitation of nuclei [2], elastic electron scattering [3], subbarrier scattering, and reactions involving charged nuclear particles [4]. The fact that the potential of the interaction between a projectile alpha particle and a target nucleus was known exactly led to the discovery of the Rutherford law for the elastic scattering of pointlike charged particles, to deriving an analytic formula for the limiting cross section for the elastic scattering of such particles by nuclei, and ultimately to determining the dimensions of nuclei. Further investigations revealed that even the elastic scattering of complex nuclear particles on nuclei at energies below the Coulomb barrier is reproduced by the Rutherford formula only approximately. At rather low energies, the nuclear interaction of the projectile particle with a target nucleus can be disregarded, but significant deviations from purely Coulomb scattering may arise even in this case, this being due to manifestations of internal degrees of freedom of interacting projectile and target nuclei (that is, real or virtual excitations of nuclear states). These effects are especially pronounced in the scattering of loosely bound particles (d, 6 He, 9,11 Li, 11 Be, etc.). If the target nucleus does not have lowlying collective states (for example, 208 Pb), it can be treated as an inert heavy pointlike charge. In this case, the deviation of the cross section for elastic scattering of such particles from the Rutherford cross section at subbarrier energies is due to their
dynamical polarization and breakup in the electric field of the target nucleus [4, 5]. In view of this, it is quite clear that investigation of the interaction of light loosely bound particles with heavy target nuclei at subbarrier energies may provide a convenient and incisive probe into the dynamical properties of such particles and a means for obtaining information about their structural fe
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