Heavy-ion charge exchange reactionSi28(O

Abstract

The angular distribution has been measured for the 3+ and 2+ ground state doublet in "Al with the heavyion charge exchange reaction Si{' 0, ' F) Al at the incident beam energy of 56 MeV. It has been analyzed in terms of the microscopic one-step direct charge exchange model and the second-order DWBA approach with recoil effect taking into account the two-step successive transfer: one nucleon stripping and pickup, and pickup and stripping process. The general shape of angular distribution has been reproduced by both approaches. The strength of the spin-isospin dependent two-body interaction potential extracted from one-step calculations is close to the upper limit of uncertainties reported in the light-ion charge exchange experiment.The two-step mechanism turns out to be also important and could be a competing process. P' NUCLEAR REACTION Si( 0, 8F), E=56 MeV; measured 0. (8); microscopic D%'BA analysis; second-order DWBA analysis with recoil effect; deduced strength of the (0 o)(v' v) term in the nucleon-nucleon two-body force.

Elastic scattering and breakup of17Fat 10 MeV/nucleon

“…The charge exchange cross section is calculated to be 2 orders of magnitude smaller than that of one-proton transfer calculated by DWBA. Measurements of 28 Si( 18 O, 18 F) 28 Al show that the charge exchange cross section is at least an order of magnitude smaller than that of one-nucleon transfer [22], consistent with the results of our calculations. Since DWBA calculations predict that the one-proton transfer cross sections are much smaller than the measured cross sections, it is safe to assume that charge exchange can be ignored.…”

A Constrained Analysis of the 40Ca(18O,18F)40K Direct Charge Exchange Reaction Mechanism at 275 MeV

“…It is worthwhile to emphasize that the above-mentioned calculations are based on a quite involved approach, starting from microscopic nuclear response functions, combined with freespace nucleon-nucleon interactions to derive the transition form factors and fixing ion-ion ISI and FSI by elastic scattering and inelastic scattering. The advantage of such a demanding program is evident from the fact that the data are quite well-described without the need to introduce additional scaling factors, as it was found necessary in the former heavy-ion-induced SCE reactions on the same target such as the 40 Ca( 7 Li, 7 Be) 40 K reaction at 35 MeV (Williams-Norton et al, 1979) or the pioneering studies on ( 18 O, 18 F) on different targets (Kim et al, 1979;Horen et al, 1986;Fifield et al, 1993).…”

“…Not much is known about the ( 18 O, 18 F) SCE reaction, which is discussed in the present paper. Such a probe has been studied on the 28 Si and 36 S targets from 3 to 19.6 A MeV (Kim et al, 1979;Horen et al, 1986;Fifield et al, 1993). In all cases, a significant role of the direct mechanism has been deduced, especially at the highest beam energies, but uncertainties in the adopted models for the nuclear structure and reaction inputs did not allow to draw any firm conclusion.…”

Heavy ion charge exchange reactions as probes for nuclearβ-decay

“…In fact, quite early the large research potential especially of heavy ion charge exchange reactions was recognized and experiments started soon after beams of suitable composition and quality and the necessary detector systems became available, see e.g. [1][2][3][4][5][6][7]. A clear advantage of heavy ion charge exchange reactions is the possibility to study in principle the whole set of isospin excitation branches simultaneously with the same incident ion-ion system.…”