α-particle production in the scattering of 6He by 208Pb at energies around the Coulomb barrier

Abstract

New experimental data from the scattering of 6 He + 208 Pb at energies around and below the Coulomb barrier are presented. The yield of breakup products coming from projectile fragmentation is dominated by a strong group of α particles. The energy and angular distribution of this group have been analyzed and compared with theoretical calculations. This analysis indicates that the α particles emitted at backward angles in this reaction are mainly due to two-neutron transfer to weakly bound states of the final nucleus.

α-particle production inHe6+SnFaria1, Lichtenthäler2, Pires3 et al. 2010Phys. Rev. C449712View full textAdd to dashboardCite

“…These calculations have been performed using the transfer to the continuum (TC) method [16,17], using the FRESCO code [18]. The distorted waves of the incoming channel were generated with the optical potentials derived in Ref.…”

Reexamining closed-form formulae for inclusive breakup: Application to deuteron- andLi6-induced reactions

“…As long as the basis used to describe these final states is complete, one may argue that the sum over these representative states should provide results close to those obtained if the sum were done over the true physical states. This procedure, referred to in some works as transfer to the continuum method, has been used recently with success to describe some inclusive breakup reactions of weakly bound projectiles at Coulomb barrier energies, such as 208 Pb( 8 Li, 7 Li) [18], 208 Pb( 6 He, α) [19], and 120 Sn( 6 He, α) [20]. However, despite this relative success, this method is based on a heuristic approach rather than on a rigorous formal theory.…”

Elastic Scattering of ^{<span class="cmr-7">8</span>}He + ^{<span class="cmr-7">208</span>}Pb at 22 MeV

“…Compared with 6 He, previously studied by the collaboration [3][4][5], 8 He has more neutrons of valence but more tightly bound and its binding energies for 1n and 2n systems are similar whereas in the 6 He the two-neutron breakup is energetically favored. The differences between both helium isotopes are expected to be reflected in the elastic and reaction cross sections for collisions with heavy targets at Coulomb barrier energies.…”