English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate the magicity of the isotopes $^{52}$Ca and $^{54}$Ca, that wasrecently confirmed by two experimental measurements, and relate it tolike--particle and neutron--proton tensor effects within a mean--fielddescription. By analyzing Ca isotopes, we show that the like--particle tensorcontribution induces shell effects that render these nuclei more magic thanthey would be predicted by neglecting it. In particular, such induced shelleffects are stronger in the nucleus $^{52}$Ca and the single--particle gaps areincreased in both isotopes due to the tensor force. By studying $N=32$ and$N=34$ isotones, neutron--proton tensor effects may be isolated and their roleanalyzed. It is shown that neutron--proton tensor effects lead to increasing$N=32$ and $N=34$ gaps, when going along isotonic chains, from $^{58}$Fe to$^{52}$Ca, and from $^{60}$Fe to $^{54}$Ca, respectively.  The mean--field calculations are perfomed by employing one Skyrme parameterset, that was introduced in a previous work by fitting the tensor parameterstogether with the spin--orbit strength. The signs and the values of the tensorstrengths are thus checked within this specific application. The obtainedresults indicate that the employed parameter set, even if generated with apartial adjustment of the parameters of the force, leads to the correct shellbehavior and provides, in particular, a description of the magicity of$^{52}$Ca and $^{54}$Ca within a pure mean--field picture with the effectivetwo--body Skyrme interaction.

Magicity of the $^{52}$Ca and $^{54}$Ca isotopes and tensor contribution within a mean--field approach