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Inclusive double differential multiplicities of deuterons, ^3H, ^3He, and^4He measured by E877 for 11.5 A GeV/c Au+Au collisions at the AGS arepresented. Light fragments at beam-rapidity are measured for the first time atAGS energies. Beam rapidity deuteron and ^4He yields and transverse slopeparameters are found to be strongly dependent on impact parameter and the shapeof the deuteron spectra is not consistent with that expected for a simplethermal distribution. The deuteron yields relative to proton yields areanalyzed in terms of a simple coalescence model. While results indicate anincrease in source size compared to collisions of lighter systems at the sameenergy, they are inconsistent with a simple coalescence model reflected by arapidity dependence of the coalescence parameter B_d. A new approach utilizingan expanding thermalized source combined with a coalescence code is developedfor studying deuteronformation in heavy-ion collisions. The strong dependenceof deuteron yields on collective motion implies that deuteron yields relativeto those of protons can be used for constraining source parameters.Comment: 33 pages, 14 figures, accepted for publication in PR

physical review. c. nuclear physics/physical review. c, nuclear physics

Light fragment yields from central Au+Au collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mn>1</mml:mn><mml:mo>.</mml:mo><mml:mn>5</mml:mn><mml:mi>A</mml:mi><mml:mi> </mml:mi><mml:mi mathvariant="normal">GeV</mml:mi><mml:mo>/</mml:mo><mml:mi>c</mml:mi></mml:math>

Light fragment yields from central Au+Au collisions at11.5A GeV/c