C
C     ..................................................................
C
C        SUBROUTINE QA9
C
C        PURPOSE
C           TO COMPUTE INTEGRAL(EXP(-X)*FCT(X)/SQRT(X), SUMMED OVER X
C                               FROM 0 TO INFINITY).
C
C        USAGE
C           CALL QA9 (FCT,Y)
C           PARAMETER FCT REQUIRES AN EXTERNAL STATEMENT
C
C        DESCRIPTION OF PARAMETERS
C           FCT    - THE NAME OF AN EXTERNAL FUNCTION SUBPROGRAM USED.
C           Y      - THE RESULTING INTEGRAL VALUE.
C
C        REMARKS
C           NONE
C
C        SUBROUTINES AND FUNCTION SUBPROGRAMS REQUIRED
C           THE EXTERNAL FUNCTION SUBPROGRAM FCT(X) MUST BE FURNISHED
C           BY THE USER.
C
C        METHOD
C           EVALUATION IS DONE BY MEANS OF 9-POINT GENERALIZED GAUSSIAN-
C           LAGUERRE QUADRATURE FORMULA, WHICH INTEGRATES EXACTLY,
C           WHENEVER FCT(X) IS A POLYNOMIAL UP TO DEGREE 17.
C           FOR REFERENCE, SEE
C           CONCUS/CASSATT/JAEHNIG/MELBY, TABLES FOR THE EVALUATION OF
C           INTEGRAL(X**BETA*EXP(-X)*F(X), SUMMED OVER X FROM 0 TO
C           INFINITY) BY GAUSS-LAGUERRE QUADRATURE, MTAC, VOL.17,
C           ISS.83 (1963), PP.245-256.
C
C     ..................................................................
C
      SUBROUTINE QA9(FCT,Y)
C
C
      X=25.48598
      Y=.1565640E-10*FCT(X)
      X=18.04651
      Y=Y+.2093441E-7*FCT(X)
      X=12.77183
      Y=Y+.3621309E-5*FCT(X)
      X=8.769757
      Y=Y+.0001836225*FCT(X)
      X=5.694423
      Y=Y+.003777045*FCT(X)
      X=3.369176
      Y=Y+.03728008*FCT(X)
      X=1.692395
      Y=Y+.1946035*FCT(X)
      X=.6032364
      Y=Y+.5696146*FCT(X)
      X=.06670223
      Y=Y+.9669914*FCT(X)
      RETURN
      END
