n=8Li gs, 8Lin=9Li gs bound systems were obtained from a FR-DWBA analysis of neutron transfer reactions induced by 8Li radioactive beam on a 9Be target, while spetroscopic factor for the 8Lip=9Be gs 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.]]>
n=8Li gs, 8Lin=9Li gs fueron obtenidos del análisis con FR-DWBA de la transferencia de un neutrón del proyectil radiactivo 8Li a un núcleo de 9Be, mientras que para el sistema ligado 8Lip=9Be gs, 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.]]>
Transfer reactions in the investigation of light–nuclei 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. Martinez–Quirozd, and H. Garciad
ª Instituto de Física, Universidade de São Paulo, P.O. Box 66318, 05389–970 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 48109–1120, USA.
d Instituto Nacional de Investigaciones Nucleares, Apartado Postal 18–1027, 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 bound–state 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 FR–DWBA 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 FR–DWBA 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.
The authors wish to thank the Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP 2006/00629–2 and 2007/06705–5) for financial support. This work was also funded in part by the U.S. NSF under Grants No. PHY03–54828 and INT03–05347.
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n=9Li gs bound systems were obtained from a FR-DWBA analysis of neutron transfer reactions induced by 8Li radioactive beam on a 9Be target, while spetroscopic factor for the 8Li
n=8Ligs, 8Li