Escape width and spreading width of IAR (Isobaric Analogue Resonance)

Calculations are made for the escape width and spreading width of an isobaric analogue resonance excited in the compound system Cr52 in the reaction V51(p,n)Cr51. Reproduction of the spectrum of the parent system V52 provides the parent state wave function and the interaction parameters. The calculated value of the escape width in the case when analogue state formed by operating with isospin lowering operator T - on the parent state, is found to be too small. This may be due to the difference in the single particle wave functions of the proton particle and neutron hole, which is taken to be same in the isospin basis. Utilisation of analogue state wave function formed by diagonalising the Hamiltonian matrix in neutron hole-proton particle (pair couple to J=o) on the so-called complicated state matrix, restricted by energy considerations, comes out to be 95 x 95. The calculations for this part are in progress. (author)