Abstract
A Monte Carlo method is given to solve nuclear many body problems in the frame of the Ritz' variational principle. The antisymmetrization and all integrations are performed by a random process. The method is formulated for a two cluster system, using oscillator wave functions and hard core forces, but it can be generalized to rather arbitrary forces and wave functions. As a test example, the ground state energy and rms-radius of the α-particle has been calculated. For the final parameter values, an accuracy in the energy of 10 % (2 %) was obtained after a calculation time of 40 sec (16 min) wit ann IBM 7090 computer. The accuracy in the radius is by a factor 8 better. The minimum energy depends rather strongly on the form of the trial wave function near the hard core.
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