Servicios Personalizados
Revista
Articulo
Indicadores
- Citado por SciELO
- Accesos
Links relacionados
- Similares en SciELO
Compartir
Revista mexicana de física
versión impresa ISSN 0035-001X
Rev. mex. fis. vol.54 supl.3 México dic. 2008
Transfer reactions in the investigation of lightnuclei nucleosynthesis
V. Guimarãesª, O. Camargoª, R. Lichtenthälerª, V. Scarduelliª, J.J. Kolatab, H. Amroc, F.D. Becchettic, Hao Jiangc, E.F. Aguilerad, D. Lizcanod, E. MartinezQuirozd, and H. Garciad
ª Instituto de Física, Universidade de São Paulo, P.O. Box 66318, 05389970 São Paulo, SP, Brazil.
b Department of Physics, University of Notre Dame, Notre Dame, Indiana, 46556, USA.
c Department of Physics, University of Michigan, Ann Arbor, Michigan 481091120, USA.
d Instituto Nacional de Investigaciones Nucleares, Apartado Postal 181027, México, D.F. 11801 México.
Recibido el 27 de febrero de 2008
Aceptado el 25 de abril de 2008
Abstract
Cross sections for the 6Li(p,γ)7 Be, 7Li(n,γ)8 Li 8Li(n,γ)9 Li and 8Li(p,γ)9 Be capture reactions have been investigated in the framework of the potential model. The main ingredients of the potential model are the potentials used to generate the continuum and boundstate wave functions and spectroscopic factors of the corresponding bound systems. The spectroscopic factors for the 7Lin=8Ligs, 8Lin=9Ligs bound systems were obtained from a FRDWBA analysis of neutron transfer reactions induced by 8Li radioactive beam on a 9Be target, while spetroscopic factor for the 8Lip=9Begs bound system were obained from a proton transfer reaction. From the obtained capture reaction cross section, reaction rate for the 8Li(n, γ)9Li and 8Li(p, γ)9Be direct neutron and proton capture were determined and compared with other experimental and calculated values.
Keywords: Capture reactions; transfer reactions; spectroscopic factors.
Resumen
Se hace un estudio de las secciones eficaces de las reacciones de captura para 6Li(p,γ)7 Be, 7Li(n,γ)8 Li, 8Li(n,γ)9 Li y 8Li(p,γ)9 y 8Li(p,γ)9Be en el marco de un modelo de potencial. Los principales ingredientes de este modelo son los potenciales usados para generar las funciones de onda del continuo y para los estados ligados así como los factores espectroscópicos de los sistemas ligados correspondientes. Los factores espectroscópicos de los sistemas ligados para 7Lin=8Ligs, 8Lin=9Ligs fueron obtenidos del análisis con FRDWBA de la transferencia de un neutrón del proyectil radiactivo 8Li a un núcleo de 9Be, mientras que para el sistema ligado 8Lip=9Begs, los factores espectroscópicos se obtuvieron de análisis de la transferencia de un protón. De las secciones eficaces de reacciones de captura obtenidas, se determinaron las razones de reacción de captura directa y se compararon con otros valores calculados y experimentales.
Descriptores: Reacciones de captura; reacciones de transferencia; factores espectroscópicos.
PACS: 25.60.Je; 25.40.Lw; 25.70.Hi
DESCARGAR ARTÍCULO EN FORMATO PDF
Acknowledgments
The authors wish to thank the Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP 2006/006292 and 2007/067055) for financial support. This work was also funded in part by the U.S. NSF under Grants No. PHY0354828 and INT0305347.
References
1. V. Guimarães et al, Phys. Rev. C 75 (2007) 054602. [ Links ]
2. R.A. Malaney and W.A. Fowler, Astrophys. J. 333 (1989) 14. [ Links ]
3. M. Terasawa et al., Astrophys. J. 562 (2001) 470. [ Links ]
4. J. Gorres, H. Herndl, I.J. Thompson, and M. Wiescher, Phys. Rev. C 52 (1995) 2231. [ Links ]
5. C.A. Gagliardi et al., Eur. Phys. J. A 13 (2002) 227. [ Links ]
6. A. Mengoni, T. Otsuka, and M. Ishihara, Phys. Rev. C 52 (1995) R2334. [ Links ]
7. Y. Nagai et al., Phys. Rev. C 71 (2005) 055803. [ Links ]
8. M. Assunção, R. Lichtenthaler, V. Guimarães, A. LepineSzily, and A.M. Moro. Pos(NICIX2006), Proceedings of Science (2006) 071; and Phys. Rev. C 70 (2004) 054601. [ Links ]
9. C.A. Bertulani, Comput. Phys. Commun. 156 (2003) 123. [ Links ]
10. Z.E. Switkowski et al. Nucl. Phys. A 331 (1979) 50. [ Links ]
11. R. Lichtenthaler, A. LepineSzily, V. Guimaraes, G.F. Lima, and M.S. Hussein, Eur. Phys. J. 25 (2005) 733. [ Links ]
12. F.D. Becchetti et al., Nucl. Instr. and Methods in Res. A 505 (2003) 377. [ Links ]
13. V. Guimarães et al. (to be published). [ Links ]
14. I.J. Thompson, Comp. Phys. Rep. 7 (1988) 167; and www.fresco.org.uk. [ Links ]
15. P. Navratil, Phys. Rev. C 70 (2004) 054324. [ Links ]
16. H. B. Jeppesen et al., Phys. Letters B 635 (2006) 17. [ Links ]
17. S. Cohen and D. Kurath, Nucl. Phys. A 101 (1967) 1. [ Links ]
18. Z.H. Li et al., Phys. Rev. C 71 (2005) 052801R. [ Links ]
19. A.H. Wuosmaa et al., Phys. Rev. Lett. 94 (2005) 082502. [ Links ]
20. R. Kanungo, et al., Phys. Lett. B 600 (2008) 26. [ Links ]
21. L. Trache, et al. Phys. Rev. C 67 (2003) 062801. [ Links ]
22. S.E. Darden, G. Murillo, and S. Sen, Nucl. Phys. A 266 (1976) 29. [ Links ]
23. D.L. Powell, G.M. Grawley, B.V.N. Rao, and B.A. Robson, Nucl. Phys. A 147 (1970) 65. [ Links ]
24. W. Fitz, R. Jahr and R. Santo, Nucl. Phys. A 101 (1967) 449. [ Links ]
25. I.S. Towner, Nucl. Phys. A 126 (1969) 97. [ Links ]
26. B. Fagerstrom, J. Kallne, O. Sundberg, and G. Tibell, Phys. Scr. 13 (1976) 101. [ Links ]
27. J. Su et al., Chin. Phys. Lett. 23 (2006) 55. [ Links ]
28. J.P. Schifer et al., Phys. Rev. 164 (1967) 164. [ Links ]
29. M. Heil, F. Kaeppeler, M. Wiescher, and A. Mengoni, Astrophys. J. 507 (1998) 997. [ Links ]
30. Y. Nagai, et al. Astrophys. J. 381 (1991) 444. [ Links ]
31. M. Wiescher, R. Steininger, and F. Kappeler, Astrophys. J. 344 (1989) 464. [ Links ]
32. W.L. Imhof, et al., Phys. Rev. 114 (1959) 1037. [ Links ]
33. C. Angulo et al., Nucl. Phys. A 656 (1999) 3. [ Links ]
34. F.K. Thielemann, J.H. Cowan, and M. Wiescher, in Nuclei in the Cosmos, edited by H. Oberhummer, et al. (Springer, Berlin, 1991). [ Links ]
35. P. Descouvemont, Astrophys. J. Lett. 405 518 (1993). [ Links ]
36. T. Rauscher, J.H. Applegate, J.J. Cowan, F.K. Thielemann, and M. Wiescher, Astrophys. J. 429 (1994) 499. [ Links ]
37. C.A. Bertulani, J. Phys. G 25 (1999) 1959. [ Links ]
38. E.A. Benjamim et al., Phys. Lett. B647 (2007) 30. [ Links ]