Breakup reactions of the halo nucleiBe11andB

Abstract

We calculate the nuclear induced breakup of 11 Be and 8 B using a more realistic treatment of the diffraction and stripping processes than in previous work. The breakup is treated in the eikonal approximation with a profile function calculated from a realistic optical potential at low energies and from free nucleon-nucleon cross sections at high energies. This treatment gives a good description of measured breakup cross sections, as well as the longitudinal momentum distribution of the core-like fragments, which is narrower than predicted in the transparent limit. The real part of the potential is found to be significant and enhances the diffractive breakup at low energies.25.60. Gc,25.70.Mn

Structure ofN22and theN=14subshell

“…Such an approach is justified since the data discussed here were obtained at high energy, where the eikonal approximation [18] is the proper theoretical tool. This is thus a convenient approach for the description of the momentum distributions of the core fragments and the corresponding cross sections in one-nucleon stripping.…”

“…This is thus a convenient approach for the description of the momentum distributions of the core fragments and the corresponding cross sections in one-nucleon stripping. The method has been discussed earlier [18] and has been used successfully in calculations of, for example, the 9 Be ( 11 Be, 10 Be) reaction [19,20]. In this model, the determination of realistic profile functions S i (i = core, n), and the core-nucleon wave functions are the major points for the calculations.…”

“…For the 18,19 N cases, the valence neutron couples to low-lying excited states, while it couples to the ground state for 20,21 N. An explanation for this might be that the d state is more pure in the vicinity of N = 14, while the structures of the lighter isotopes are more complex. (ii) For 22 N, the fit needs similar amounts of s 1/2 and d 3/2(5/2) contributions, with the s contribution coupled to the ground state of the core.…”

“…The experimental data for 18 ©2011 American Physical Society separator (FRS) spectrometer [17] at GSI. The nitrogen isotopes were produced in projectile fragmentation of a fully ionized 40 Ar primary beam, accelerated in the heavy-ion synchrotron (SIS) to 700 MeV/nucleon and then impinging on a 4 g/cm 2 Be target placed at the entrance of the FRS.…”

Reaction Dynamics for Light Dripline Nuclei

“…The breakup models discussed at the early stages of physics with Radiaoctive Ion Beams (RIBs) [1][2][3][4][5][6][7] were introduced having in mind very high incident energies and small initial-state separation energies. Under such conditions energy and momentum conservation can be neglected.…”