Polarized d+3He capture into the 3/2spl fusion resonance of Li5 and the role of the tensor force
The absolute differential cross section and analyzing powers Ay(), Ayy(), and T20() of the He3(d,)5Li reaction have been measured with an 800 keV deuteron beam which was stopped in a gaseous He3 target. A transition matrix element analysis of the data leads to two solutions, both of which indicate the reaction proceeds predominantly through s-wave (E1) capture, with small admixtures of M1 radiation. One solution has predominantly 4s3/2(E1) capture strength, the other has nearly equal capture strengths from the 2s1/2(E1) and 4s3/2(E1) transition matrix elements. Resonating group model (RGM) calculations have been performed which favor the solution with dominant 4s3/2(E1) capture strength. In the RGM picture, the fusion resonance in the capture cross section is a consequence of the tensor force, which couples the [d+3He]J=3/2S=3/2 scattering channel to the [p+4He]J=3/2S=1/2 scattering channel, enabling the reaction to proceed via theS=0 (E1) transition to the ground state. The finite tensor analyzing powers of the present experiment serve to support this interpretation of the role of the tensor force. © 1992 The American Physical Society.
Balbes, MJ; Feldman, G; Weller, HR; Tilley, DR
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