Determination of the asymptotic D- to S-state ratio for Li-6 via ((6)(Li)over-right-arrow,d) transfer reactions - art. no. 064003

Citation
Kd. Veal et al., Determination of the asymptotic D- to S-state ratio for Li-6 via ((6)(Li)over-right-arrow,d) transfer reactions - art. no. 064003, PHYS REV C, 6006(6), 1999, pp. 4003
Citations number
57
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW C-NUCLEAR PHYSICS
ISSN journal
0556-2813 → ACNP
Volume
6006
Issue
6
Year of publication
1999
Database
ISI
SICI code
0556-2813(199912)6006:6<4003:DOTADT>2.0.ZU;2-H
Abstract
Measurements of cross section, vector analyzing power A(y), and tensor anal yzing powers A(zz) and A(xz) over the angular range 10 degrees less than or equal to theta(lab) less than or equal to 40 degrees have been performed a t E(Li-6) = 34 MeV for the Ni-58((6)<(Li)over right arrow>, d)Zn-62 and Ca- 40((6)<(Li)over right arrow>, d)Ti-44 reactions leading to the ground state and first excited state of both residual nuclei. The reactions an describe d by distorted-wave Born approximation calculations, assuming a direct alph a-particle transfer mechanism. The asymptotic D/S state ratio eta for the d + alpha relative wave function in Li-6 is determined. In this one-step ana lysis, the best fit to the tensor observables leads to a value of eta = +0. 0003 +/- 0.0009. This value is in disagreement with most of the previous th eoretical and empirical determinations of eta. An investigation of two-step reaction mechanisms is performed, allowing the J(pi) = 3(+), 2(+), and 1() states in Li-6 to contribute to the transfer reaction channel. Reasonable agreement is achieved with the cross section and vector analyzing power da ta for several possible two-step amplitudes. It is found that the fitted ma gnitude of eta increases with increasing two-step amplitude, giving eta = - 0.0030 +/- 0.0022 for unit amplitude, therefore not changing significantly from our one-step result. [S0556-2813(99)00812-2].