T=0neutron-proton pairing correlations in the superdeformed rotational bands around60Zn

Abstract

The superdeformed bands in 58 Cu, 59 Cu, 60 Zn, and 61 Zn are analyzed within the frameworks of the Skyrme-Hartree-Fock as well as Strutinsky-Woods-Saxon total routhian surface methods with and without the T =1 pairing correlations. It is shown that a consistent description within these standard approaches cannot be achieved. A T =0 neutron-proton pairing configuration mixing of signature-separated bands in 60 Zn is suggested as a possible solution to the problem.

Time-odd mean fields in covariant density functional theory: Nonrotating systems

“…E Coul = 0 for odd-neutron systems in perturbative calculations (Tables I and II), but it can differ from zero in systems containing an odd number of protons (Tables III and IV). The results of self-consistent and perburbative calculations for the E SL ω and E SL ρ quantities are the same with the exception of configuration B in 34 Cl, where only a small difference exists (Tables I, II, and IV).…”

“…The microscopic mechanism of binding modifications is illustrated in Table IV on the example of configurations A and B of 34 Cl.…”

“…Let us check whether additional binding owing to NM (the E tot = E NM − E WNM quantity) is additive. The doubly magic SD configuration π 3 2 ν3 2 in the even-even 32 S nucleus is used as a core for this analysis: The effective contributions δE eff i of the particle state(s) to E tot are given by 34 Cl are in the same (opposite) directions. Figure 16 clearly shows that additivity conditions are not fulfilled and that additional binding owing to NM is not additive in self-consistent calculations.…”

“…The calculations suggest that signature separation owing to time-odd mean fields is also expected in the configurations of odd-odd nuclei located at zero or low excitation energies. The signature separation is especially pronounced in N = Z 26 Al (the π [202]5/2 ⊗ ν[202]5/2 configuration) and 34 Cl nuclei. This is because proton and neutron currents in these configurations are almost the same both in strength and in spatial distribution.…”

“…However, it is already known that these fields are important for proper description of rotating nuclei [17][18][19][20][21], band terminations [22,23], magnetic moments [24], isoscalar monopole vibrations [25], electric giant resonances [26], high-amplitude collective dynamics [27], fusion process [28], the strengths and energies of Gamow-Teller resonances [29], the binding energies of odd-mass nuclei [30][31][32], and the additivity of angular momentum alignments [33]. They also may play a role in N = Z nuclei [30,34] and affect the definition of the strength of pairing correlations [32,35].…”