Applications of the Nuclear Field Theory Treatment of the Pair Aligned Model

Abstract

It has been shown [1], [2] that the aligned wavefunction, and the wavefunction obtained by restricting pairs of particles to be coupled to angular momentum zero and two as assumed by the Quadrupole Phonon Model (QPM) and by the Interacting Boson Model (IBM) (cf. refs. [3]–[5] and references therein) are,for strongly deformed systems, rather different. They become identical in the vibrational limit and display a different degree of similarity for intermediate (anharmonic) situations [6], [9]. To which extent this difference reveals itself in the predicted properties of the low-energy nuclear spectrum is an open question. In an attempt to clarify this point we have calculated the spectrum and the electromagnetic and two-nucleon transfer probabilities for some of the Kr- and Sm-isotopes^*) in the framework of the NFT [10]–[12] and in a basis of monopole and quadrupole pairing modes.