Eur. Phys. J. A (2010) 44: 221-231
https://doi.org/10.1140/epja/i2010-10953-7

Regular Article - Experimental Physics

Isotopic effects in elastic and inelastic ¹²C + ^{16, 18}O scattering

¹ Institute for Nuclear Research, Prospekt Nauky 47, 03680, Kyiv, Ukraine
² Physics Department, Florida State University, 32306-4350, Tallahassee, FL, USA
³ A. Soltan Institute for Nuclear Studies, ul. Hoża 69, PL-00-681, Warsaw, Poland
⁴ Kharkiv National University, pl. Svobody 4, 61077, Kharkiv, Ukraine
⁵ H. Niewodniczański Institute of Nuclear Physics, ul. Radzikowskiego 152, PL-31-342, Cracow, Poland
⁶ Russian Research Center “Kurchatov Institute”, Kurchatov Sq. 1, 123182, Moscow, Russia
⁷ Heavy Ion Laboratory of Warsaw University, ul. L. Pasteura 5A, PL-02-093, Warsaw, Poland
⁸ Institute of Applied Physics, MUT, ul. Kaliskiego 2, PL-00-908, Warsaw, Poland

^* e-mail: rudchik@kinr.kiev.ua

Received: 9 December 2009
Revised: 7 February 2010
Accepted: 5 March 2010
Published online: 15 April 2010

Abstract

Complete angular distributions of the ¹²C + ¹⁸O elastic and inelastic scattering were measured at the energy E _lab(¹⁸O) = 105 MeV (E _c.m. = 42 MeV) . Comparison of these elastic-scattering data with those from previously measured ¹²C + ¹⁶O data show their large-angle cross-sections to differ by as much as a factor of 100 with the ¹⁶O data being the largest. These and the ¹²C + ¹⁸O scattering data taken from the literature at the energies E _c.m. = 12.9-56 MeV were analysed within the optical model and coupled-reaction-channels methods. Sets of Woods-Saxon ¹²C + ¹⁸O optical potential parameters were obtained and their energy dependence was deduced. A similar analysis was carried out for ¹²C + ¹⁶O where it was shown that over a wide energy range, the primary difference in the ¹⁶O and ¹⁸O scattering potentials is in their imaginary parts. The large-angle enhancement for the ¹²C + ¹⁸O elastic-scattering was shown to arise from the transfer of nucleons. The inelastic-scattering data were well described over the entire angular range as arising from collective excitations of the states in the target and projectile nuclei.