Speaker
Description
The phenomenon of quarteting in even-even $N=Z$ nuclei has a
long history in nuclear structure [1].
In a recent work [2] we have highlighted on analytic grounds
the key role played by the isovector
pairing in such a phenomenon. We have indeed
shown that $\alpha$-like quartets, i.e., correlated four-body structures
made by two protons and two neutrons, do represent the distinctive
feature of the exact eigenstates of this Hamiltonian in $N=Z$
even-even systems.
But how do quartets develop in the presence of a general
Hamiltonian?
I will provide a description of deformed $N=Z$ nuclei in the
$sd$ and $pf$ shells in a formalism of $\alpha$-like quartets.
I will show how these quartets have been built by resorting to
the use of proper intrinsic states [3].
As a peculiarity of this approach, which improves a technique
employed in previous works [4,5], it will be shown
that the spectra of these nuclei can be organized in bands
associated to the various intrinsic states built in terms of
quartets. The quartet structure of both the
ground and excited states of these $N=Z$ nuclei is expected to influence
significantly the outcomes of alpha transfer and scattering processes.
[1] A. Arima, V. Gillet, and J. Ginocchio, Phys. Rev. Lett. 25 (1970) 1043.
[2] M. Sambataro and N. Sandulescu, J. Phys. G.: Nucl. Part. Phys. 47 (2020) 045112.
[3] M. Sambataro and N. Sandulescu, Phys. Lett. B 827 (2022) 136987.
[4] M. Sambataro and N. Sandulescu, Phys. Rev. Lett. 115 (2015) 112501.
[5] M. Sambataro and N. Sandulescu, Phys. Rev. C 91 (2015) 064318.
| Topic | Theory |
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