| Full text | |
| Author(s): Show less - |
Zamora, J. C.
;
Ferreira, J. L.
;
Barioni, A.
;
Cardozo, E. N.
;
Abriola, D.
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Arazi, A.
;
Assuncao, M.
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de Barbara, E.
;
Cardona, M. A.
;
Guimaraes, V
;
Hojman, D.
;
Marti, G., V
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Mendes, D. R.
;
Pacheco, A. J.
;
Pires, K. C. C.
;
Ramos, D.
;
Santos, O. C. B.
;
Lubian, J.
Total Authors: 18
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW C; v. 106, n. 1, p. 14-pg., 2022-07-05. |
| Abstract | |
Background: Two-nucleon transfer reactions provide a unique tool to understand the correlation between nucleon pairs. Two-nucleon (pp, nn, and np) transfer reactions can occur via isoscalar (T = 0, S = 1) or isovector (T = 1, S = 0) processes. In particular, the isoscalar pair transfer can be induced by the (alpha, d) or (Li-6, alpha) probes. In the past, most of the isoscalar np-transfer studies were performed with the (alpha, d) reaction, but this probe is strongly momentum mismatched with respect to other two-nucleon transfer reactions. Purpose: We aim to investigate the interplay between direct and sequential reaction mechanisms from the analysis of experimental (Li-6, alpha) angular distributions in light targets. Method: Differential cross sections of (Li-6, alpha) reactions at a beam energy of 20 MeV were measured with C-12 and F-19 targets. The interplay between direct and sequential transfer mechanisms in the experimental angular distributions was investigated with coupled-reaction-channels calculations. Results: The experimental angular distributions of isoscalar np transfer were compared with theoretical calculations assuming a direct or a sequential reaction mechanism. Direct np-transfer calculations describe successfully most of the angular distributions. The sequential transfer mechanism is about two orders of magnitude smaller than the direct process. Conclusions: The present results suggest a significant np correlation in the C-12(Li-6, alpha)N-14(*) and F-19(Li-6, alpha)Ne-21(*) reactions. Despite the relatively low cross section for the reactions with the asymmetric F-19 target, the direct transfer mechanism remains dominant over the sequential process. Further studies including measurements with other asymmetric sd-shell nuclei will be required to fully understand the isoscalar and isovector np-transfer mechanism in this nuclear region. (AU) | |
| FAPESP's process: | 18/04965-4 - Study of structure and nuclear reactions induced by exotic nuclei using active targets |
| Grantee: | Juan Carlos Zamora Cardona |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 19/07767-1 - Nuclear reactions with weakly-bound or cluster-structured radioactive and stable nuclei |
| Grantee: | Leandro Romero Gasques |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 16/17612-7 - Dynamics of many-body systems IV |
| Grantee: | Arnaldo Gammal |
| Support Opportunities: | Research Projects - Thematic Grants |