Phys. Rev. Lett. 102, 092501 (2009) [4 pages]Shell Erosion and Shape Coexistence in 1643S27
See accompanying Physics Viewpoint We report on the g-factor measurement of the first isomeric state in 1643S27 [Ex=320.5(5) keV, T1/2=415(5) ns, and g=0.317(4)]. The 7/2- spin-parity of the isomer and the intruder nature of the ground state of the nucleus are experimentally established for the first time, providing direct and unambiguous evidence of the collapse of the N=28 shell closure in neutron-rich nuclei. The shell model, beyond the mean-field and semiempirical calculations, provides a very consistent description of this nucleus showing that a well deformed prolate and quasispherical states coexist at low energy. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.092501
DOI:
10.1103/PhysRevLett.102.092501
PACS:
21.10.Ky, 21.60.Cs, 23.35.+g, 27.40.+z
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