Электронный каталог

Статья

Zhang, J.
Influence of Z=100 and N=152 Deformed Shells on K&sup(*p)=8*- Isomers and Rotational Bands in N=150 Isotones / J.Zhang, T.M.Shneidman, R.V.Jolos, [a.o.] // Physical Review C [Electronic resource]. – 2025. – Vol. 111, No. 1. – P. 014319. – URL: https://doi.org/10.1103/PhysRevC.111.014319.

The 𝐾𝜋=8− isomeric states and rotational bands in the even-even 𝑁=150 isotones with 94⩽𝑍⩽104 are investigated by the cranked shell model (CSM) with pairing correlations treated by the particle-number-conserving (PNC) method. The experimental band-head energies and kinematic moments of inertia (MOIs) are reproduced quite well by the PNC-CSM calculation. The two-neutron state with configuration 𝜈⁢9/2−⁢[734]⊗𝜈⁢7/2+⁢[624] is the lowest 8− state for these isomers. This is a demonstration of the deformed neutron shell at 𝑁=152. Low-lying two proton 𝜋2⁢8−⁢(𝜋⁢9/2+⁢[624]⊗𝜋⁢7/2−⁢[514]) configuration state is predicted only for 252 No and 254 Rf due to the deformed proton shell at 𝑍=100. A distinct upbending is observed for the 𝜈2⁢8− bands in the lighter isotones while it is absent for bands in the heavier ones. The upbending of the 𝜈2⁢8− band at frequency ℏ⁢𝜔≈0.20 MeV in 244 Pu attributes to the sudden proton alignment of the interference term 𝑗𝑥⁢(𝜋⁢5/2+⁢[642]⊗𝜋⁢7/2+⁢[633]). The irregularity of MOI observed in the 𝐾𝜋=8− band of 252 No can be explained by the crossing between the 𝜈2⁢8−⁢(𝜈⁢9/2−⁢[734]⊗𝜈⁢7/2+⁢[624]) and 𝜋2⁢8−⁢(𝜋⁢9/2+⁢[624]⊗𝜋⁢7/2−⁢[514]) configurations. The 20%–30% increase of the band head 𝐽(1) for the 8− bands comparing to the ground-state band is attributed to the ∼5% pairing gap reduction of the two-neutron 𝜈⁢7/2+⁢[624]⊗𝜈⁢9/2−⁢[734] configuration state comparing to the ground-state band.



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