Direct reaction measurements with a132Sn radioactive ion beam

Abstract

The (d,p) neutron transfer and (d,d) elastic scattering reactions were measured in inverse kinematics using a radioactive ion beam of 132 Sn at 630 MeV. The elastic scattering data were taken in a region where Rutherford scattering dominated the reaction, and nuclear effects account for less than 8% of the elastic scattering cross section. The magnitude of the nuclear effects, in the angular range studied, was found to be independent of the optical potential used, allowing the transfer data to be normalized in a reliable manner. The neutron-transfer reaction populated a previously unmeasured state at 1363 keV, which is most likely the single-particle 3p 1/2 state expected above the N = 82 shell closure. The data were analyzed using finite-range adiabatic-wave calculations and the results compared with the previous analysis using the distorted-wave Born approximation. Angular distributions for the ground-and first-excited states are consistent with the previous tentative spin and parity assignments. Spectroscopic factors extracted from the differential cross sections are similar to those found for the one-neutron states beyond the benchmark doubly-magic nucleus 208 Pb.

Effects of nonlocal potentials on(p,d)transfer reactions

“…The second is relevant when using transfer reactions to extract spectroscopic factors since only forward angles are used (as done in e.g. [1,2]). In Table III we show the total cross sections .) cross sections at the listed beam energies using the DOM and PB potential relative to the calculations with their phase-equivalent potentials.…”

“…A number of experimental programs have focused on measuring (d, p) or (p, d) reactions with the motivation of learning about shell evolution and the configuration of the valence nucleons in exotic nuclei (e.g. [1,2]). These types of reactions are also used to extract astrophysical information and quantites relevant to stockpile stewardship (e.g.…”

Li6 in a three-body model with realistic Forces: Separable versus nonseparable approach

“…Beyond these astrophysical motivations, single-nucleon transfer reactions involving the deuteron have been the preferred tool to study shell evolution in nuclear structure, both for nuclei close and far from stability (see Refs. [6,7] for two recent examples). In all these cases, a reliable reaction theory for (d,p) is a critical ingredient.…”

Rapid convergence of the Weinberg expansion of the deuteron stripping amplitude

“…We have shown here that there is a need to develop a simple procedure for correcting the ADWA, focusing specifically on calculating accurately only the first Weinberg component of the three-body scattering wave function (r, R). This would be especially important for incident energies of 3-10 MeV per nucleon, typical of TRIUMF [27], HRIBF at ORNL [28] (where the 132 Sn(d, p) 133 Sn reaction has been measured [29,30]), and ISOLDE [31], for which the influence of closed channels does not allow us to generate reliably this component using the scheme described above.…”