Collapse of N = 28 magicity in exotic 40 Mg—probe of deformed halo and 2n-radioactivity at Mg neutron drip-line

2021/09/06 by G. Saxena, M. Kumawat, R. Sharma +1
Physics and Astronomy · #Astronomical and nuclear sciences #Astrophysics #Atomic orbital #Atomic physics #Galaxy #Halo #Halo nucleus #Isotope #Neutron #Nuclear Physics and Applications #Nuclear drip line #Nuclear physics #Nuclear physics research studies #Nuclear reaction #Nucleosynthesis #Physics #Valence (chemistry) #nucl-ex #nucl-th #r-process

paper · pdf · doi:10.1088/1361-6471/ac288b

14 Pages, 7 Figures, Accepted in J Phys G: Nucl Part Phys

arxiv created 2021/09/06 · openalex publication_date 2021/09/20 · openalex created_date 2021/09/27 · arxiv updated 2021/12/08 · openalex updated_date 2026/08/05

Abstract

Abstract The exotic phenomenon of two-neutron halos and 2n-radioactivity are explored in the neutron-rich 40,42,44 Mg by employing various variants of the relativistic mean-field approach. The extended tail of spatial density distributions including the enhanced neutron radii and skin thickness, pairing correlations, single-particle spectrum and wave functions predict 40,42,44 Mg to be strong candidates for deformed neutron halos. Weakening of magicity at N = 28 plays a significant role in the existence of a weakly bound halo in 40 Mg which is currently the heaviest isotope of Mg accessible experimentally. Large deformation, mixing of f–p shell Nilsson orbitals and the valence neutron occupancy of p-states leads to a reduced centrifugal barrier and broader spatial density distributions that favour 2n-radioactivity in 42,44 Mg.

Citations

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