Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1996-12-03
Physics
Nuclear Physics
Nuclear Theory
Revtex 36 pages & 6 Postscript figures, to appear in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.55.748
We present a new method by which wavefunctions with simple structure are renormalized so as to contain more complicated structure. This method, called $H^n$-cooling method, is applied to the study of the quadrupole collective motion of $^{56}$Fe, $^{54}$Cr, $^{58}$Fe and $^{56}$Cr. The shell-model wavefunctions of lowest-lying states of these nuclei are well treated by this method. By using the wavefunctions obtained via the $H^n$-cooling method, IBM-2 parameters are derived from a realistic shell-model hamiltonian and transition operators. The Majorana interaction becomes sizably repulsive, primarily as an effect of the renormalization. The bosonic E2 effective-charges are enhanced due to the renormalization, while a quenching occurs in the M1 and M3 parameters for proton bosons. It is shown that the $\chi$ parameters take similar values in the hamiltonian and in the E2 operator.
Nakada Hitoshi
Otsuka Tomohiro
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