The structure of low-lying excitation states of even–even N = 40 isotones is studied using a five-dimensional collective Hamiltonian with the collective parameters determined from the relativistic mean-field plus BCS method with the PC-PK1 functional in the particle-hole channel and a separable paring force in the particle–particle channel. The theoretical calculations can provide a reasonable description not only for the systematics of the low-lying states along the isotonic chain but also for the detailed structure of the spectroscopy in a single nucleus. We find a picture of spherical-oblate-prolate shape transition along the isotonic chain of N = 40 by analyzing the potential energy surfaces. The coexistence of low-lying excited
states has also been shown to be a common feature in neutron-deficient N = 40 isotones.
The tensor-force effects on the evolution of spin-orbit splittings in neutron drops are investigated within the framework of the relativistic Hartree-Fock theory. For a fair comparison on the pure mean-field level, the results of the relativistic Brueckner-Hartree-Fock calculation with the Bonn A interaction are adopted as meta-data. Through a quantitative analysis, we certify that the
-pseudovector (
-PV) coupling affects the evolutionary trend through the embedded tensor force. The strength of the tensor force is explored by enlarging the strength
of the
-PV coupling. It is found that weakening the density dependence of
is slightly better than enlarging it with a factor. We thus provide a semiquantitative support for the renormalization persistency of the tensor force within the framework of density functional theory. This will serve as important guidance for further development of relativistic effective interactions with particular focus on the tensor force.
ABSTRACT.A 1794-bp cDNA fragment was amplified from mRNA isolated from pear (Pyrus pyrifolia NaKai. Cuiguan) leaves by using primers based on the sequences generated during the analysis of the pear transcriptome. The 597-amino acid sequence encoded by the cDNA was compared with the sequences in GenBank, and it was found to be similar to that of members of the sucrose-proton cotransporter family. The hydrophobic protein, which was predicted to have 11 transmembrane domains, was designated as PpSUT2. Realtime fluorescent quantitative polymerase chain reaction analysis indicated the accumulation of PpSUT2 mRNA throughout the plant, with the highest levels in the buds. Analysis of the expression of PpSUT2 during fruit development showed that the abundance of its transcripts increased at the end of April and then decreased to the lowest level at the end of July. Subcellular localization studies with the pCXDG vector as a probe demonstrated that PpSUT2 localized to cell membranes. An expression vector was constructed by inserting the PpSUT2 cDNA into pET32(a), and the vector was expressed in Escherichia coli (strain BL21) after induction with 1 mM isopropyl b-d-1-thiogalactopyranoside at 25°C. Analysis using sodium dodecyl
Abstract. The structure of low-lying excitation states of even-even N = 40 isotones is studied using a five-dimensional collective Hamiltonian with the collective parameters determined from the relativistic mean-field plus BCS method with the PC-PK1 functional in the particle-hole channel and a separable paring force in the particle-particle channel. The theoretical calculations can reproduce not only the systematics of the low-lying states along the isotonic chain but also the detailed structure of the spectroscopy in a single nucleus. We find a picture of spherical-oblate-prolate shape transition along the isotonic chain of N = 40 by analyzing the potential energy surfaces. The coexistence of low-lying excited 0 + states has also been shown to be a common feature in neutron-deficient N = 40 isotones.
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