Two-proton pickup reaction(He6,Be8)on

Matko Milin

¹

,

Đ. Miljanić

²

,

M. Aliotta³

et al.

Abstract

The first results are reported on ͑ 6 He, 8 Be͒ two-proton pick-up reactions on 12 C, 16 O, and 19 F nuclei. The measurements were done with an 18 MeV beam on 6 LiF, 7 LiF, 6 Li 2 CO 3 , and 12 C targets. The measured angular distributions for the 12 C͑ 6 He, 8 Be͒ 10 Be (g.s.) and 12 C͑ 6 He, 8 Be͒ 10 Be * ͑3.37 MeV͒ reactions show a clear signature of a direct process. Although the contributions from the 6 Li͑ 6 He, 8 Be͒ 4 H reaction were observed, no clear extraction of the 4 H data was possible.

Airy minima in the scattering of weakly bound light heavy ions

“…We thus conclude this study by returning to the new data obtained recently by Milin et al [1] for 12 C( 6 He, 6 He) scattering at 18 MeV incident energy. These data, extending to about 85 • in the center of mass, have been correctly fit by Milin et al [1] by using one of the Woods-Saxon potentials (OM1) used by Trcka et al [25] to describe 6 Li + 12 C scattering at 20 MeV (Fig. 11).…”

“…The 12 C( 6 He, 6 He) elastic angular distribution has recently been measured at 18 MeV for c.m. angles extending up to 85 • [1]; in this angular range, the experimental angular distribution is very similar to that obtained for the neighboring 12 C( 6 Li, 6 Li) system at comparable incident energies.…”

“…Finally, we analyze in Sec. V the newly available 6 He + 12 C elastic scattering data [1], and we suggest additional measurements that could provide decisive arguments in favor of a possible transparency for that system; a summary and our conclusions can be found in Sec. VI.…”

Spectroscopy ofHe7using theBe9(HeRenzi1, Raabe2, Randisi3 et al. 2016Phys. Rev. CSelf Cite5010View full textAdd to dashboardCite

“…For kinetic energies of 8 Be above some hundreds of keV, the two α particles remain kinematically focused and can be identified by coincident detection in a charged-particle detector. The effectiveness of this identification technique by 8 Be decay have been described in detail by Wozniak et al [27][28][29], and it has been successfully confirmed in experimental studies with both stable and radioactive ion beams [30,31]. In the present measurement, …”

“…In fact, Milin at al. [31] showed that the ( 6 He , 8 Be) reaction proceeds via direct process even at incident energies around 3 MeV/nucleon, resulting in a relatively high cross section, mainly because of the overlap between the 6 He and 8 Be wave functions [31]. However, only the 7 He ground state is expected to be directly populated via the pickup of two-protons from the 9 Be target, whereas excited states of 7 He involving excitations in the neutron configuration require higher-order processes.…”