Measurement of excited states in (40)Si and evidence for weakening of the N=28 shell gap.
نویسندگان
چکیده
Excited states in (40)Si have been established by detecting gamma rays coincident with inelastic scattering and nucleon removal reactions on a liquid hydrogen target. The low excitation energy, 986(5) keV, of the 2(1)(+) state provides evidence of a weakening in the N=28 shell closure in a neutron-rich nucleus devoid of deformation-driving proton collectivity.
منابع مشابه
Collapse of the N=28 shell closure in (42)Si.
The energies of the excited states in very neutron-rich (42)Si and (41,43)P have been measured using in-beam gamma-ray spectroscopy from the fragmentation of secondary beams of (42,44)S at 39A MeV. The low 2(+) energy of (42)Si, 770(19) keV, together with the level schemes of (41,43)P, provides evidence for the disappearance of the Z=14 and N=28 spherical shell closures, which is ascribed mainl...
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ورودعنوان ژورنال:
- Physical review letters
دوره 97 11 شماره
صفحات -
تاریخ انتشار 2006