Reduction of SO in ³⁴Si: weak binding or density-depletion effect ?

2020/05/04 by O. Sorlin, Sorlin, O., F. De Oliveira +3
Chemistry · Physics and Astronomy · #Advanced Chemical Physics Studies #FOS: Physical sciences #Inorganic Fluorides and Related Compounds #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Nuclear physics research studies

paper · pdf · doi:10.48550/arxiv.2005.03087

openalex publication_date 2020/05/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The reduction of the neutron spin-orbit splitting 2p_3/2 - 2p_1/2 between the ⁴¹Ca and ³⁵Si isotones is a unique feature throughout the chart of nuclides, as the spin-orbit splitting usually increases with A. Moreover, its way of decrease, gradual between ⁴¹Ca and ³⁵Si or abrupt between ³⁷S and ³⁵Si, as well as its origin, caused by the weak binding energy of the p states or by the sudden central proton density depletion in ³⁵Si, are subject of debate. The results reported here using the self-consistent Covariant Energy Density Functional calculations with the DD-ME2 parametrization rather point to an abrupt, local decrease in ³⁵Si, and to the large dominance of the central density depletion effect. It is concluded that weak binding, central density depletion as well as correlations must be taken into account to fully evaluate the amplitude and causes of this spin-orbit reduction.

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