Band-like structures and quartets in deformed N = Z nuclei

Proton-neutron pairing, quartet condensation and α− transfer in N=Z nuclei

“…Very recently it was shown that the QCM framework, based on dynamical quartets, can be extended in order to describe the low-lying excited states of N=Z nuclei [13,14]. In particular, in Ref.…”

“…2-3, the low-lying states obtained within the projected approach are compared with the experimental spectra, the QM calculations of Ref. [13] and the shell model (SM) calculations. For the experimental spectra we have shown only the states with certain angular momenta and parities.…”

“…[8][9][10]. Recently it was also shown that the ground states and the low-lying excited states of N=Z nuclei, described by realistic two-body forces of shell-model type, can be also approximated rather well in the framework of the QCM approach [11][12][13][14]. The QCM approach will be summarized below.…”

“…The accuracy of correlation energies predicted by the QCM (6) and the PBCS(12)(13)(14) states. The errors are relative to the exact results obtained by diagonalisation.…”

Quarteting in deformed N = Z nuclei

“…The approach that we illustrate in this paper is based on the use of "dynamical" quartets, namely quartets which are fixed in correspondence with each nucleus [23]. Quartets result from the minimization of special intrinsic states.…”