The Research Program at RIBRAS (Radioactive Ion Beams in Brasil)-III

Abstract

A part of the research program developed in the RIBRAS facility over the last four years is presented. Experiments using radioactive secondary beams of light exotic nuclei such as 6 He, 7 Be, 8 Li on several targets have been performed. Elastic angular distributions have been analysed by the Optical Model and four body Continuous Discretized Coupled Channels Calculations (4b-CDCC) and the total reaction cross sections have been obtained. A comparison between the reaction cross sections of 6 He and other stable projectiles with medium-heavy targets was performed. Measurements of the proton transfer reaction 12 C( 8 Li, 9 Be) 11 B are also presented.

THE ROLE OF RESONANCES IN THE CAPTURE OF 8Li(p,)9Be ON THE REACTION RATE OF THE RELEVANT ASTROPHYSICAL SYNTHESIS OF 9Be

“…f S = 0.66 (22), 0.43-0.88 f S = 0.81 (14) 9 Be( 8 Li, 9 Be) 8 (28) Furthermore, the ANC 4 P3/2 GS in the p 8 Li channel was given in [23], where ANC = 10.75(12) fm -1/2 was obtained. The constant for the 6 P3/2 state is much less -0.25(10) fm -1/2 [23].…”

“…On the basis of expression (4) and average value on interval f S = 0.66 (22) from Table 2 according works [11,21] for the AC GS, the value C = 13.71(2.52) fm -1/2 was obtained, and because = 0 2k 1.307, so dimensionless AC ( 5) is equal to Cw = 10.49(1.93). However, if to use the average value f S on all works from Table 3, equals 1.05 (28), then for constant C, we obtain a wider data interval 11.06(3.06) fm -1/2 and Cw = 8.46(2.34). Consequently, the possible interval of Cw values on two data groups from Table 3 is approximately from 6 (from the latest data) to 12.5 (from the previous results).…”