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Collapse of the N = 28 Shell Closure in ~(42)Si

机译:〜(42)Si中N = 28的壳闭合崩溃

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The energies of the excited states in very neutron-rich ~(42)Si and ~(41,43)P have been measured using in-beam γ-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 mainly to the action of proton-neutron tensor forces. New shell model calculations indicate that ~(42)Si is best described as a well-deformed oblate rotor.
机译:利用束内γ射线光谱从〜(42,44)S的次级光束在25°C的光束中测量了非常富中子的〜(42)Si和〜(41,43)P中激发态的能量。 39A MeV。 〜(42)Si,770(19)keV的低2〜+能量以及〜(41,43)P的能级方案提供了Z = 14和N = 28球形壳闭合消失的证据,这主要归因于质子中子张量力的作用。新的壳模型计算表明,〜(42)Si最好描述为变形良好的扁圆转子。

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