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Manuscript Title: DWBA program for heavy ion transfer reactions.
Authors: P.J.A. Buttle
Program title: DAISY
Catalogue identifier: ABMY_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 14(1978)133
Programming language: Fortran.
Computer: CDC 7600.
Operating system: UMRCC SCOPE V2.1.
RAM: 40K words
Word size: 60
Keywords: Nuclear physics, Finite range, Direct reaction, Transfer reaction, Scattering, Dwba, Cross section.
Classification: 17.11.

Nature of problem:
The program calculates the differential and integrated cross section for the transfer of nucleons or alpha-particles in heavy ion reactions. The Finite range Distorted Wave Born approximation is used, and all nuclear and Coulomb terms in the interaction are retained.

Solution method:
The six-dimensional DWBA integral is reduced by standard angular momentum theory to a sum of three-dimensional integrals. These are done numerically using Gaussian quadrature. An attempt has been made to reduce the input data as far as is reasonable, so that users who are not familiar with the programme can run it reliably. Both post and prior formalisms are possible and agreement between the two can be obtained to within 1%.

Restrictions:
The program deals only with one step transfer of spin 1/2 or spin zero particles. It does not allow for spin orbit forces in the distorted waves. It is restricted to 124 partial waves, although this limit could easily be increased. The maximum bound state orbital angular momentum is l=8.

Running time:
For light projectiles and targets, such as 12C or 16O, with low angular momentum transfer, runs of about 12 s are with high angular momentum transfer, run of about 12 s are needed on the CDC 7600. For heavy targets such as lead, with high angular momentum transfer, run times increase to about 3 min. All possible angular momentum transfers are included in a single run. The test run 26Mg (16O,15N)**27A1 at 45 MeV took 23 s on the CDC 7600 and 3 min on the IBM 370/165.