Jun-Qing Li

α decay half-lives of new superheavy nuclei within a generalized liquid drop model

The ensuremath{alpha} decay half-lives of the recently produced isotopes of the 112, 114, 116 and 118 nuclei and decay products have been calculated in the quasi-molecular shape path using the experimental

Production of heavy and superheavy nuclei in massive fusion reactions

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Measurements of bremsstrahlung spectra of Lanzhou ECR Ion Source No. 3 (LECR3)

value and a Generalized Liquid Drop Model including the proximity effects between nucleons in the neck or the gap between the nascent fragments. Reasonable estimates are obtained for the observed ensuremath{alpha} decay half-lives. The results are compared with calculations using the Density-Dependent M3Y effective interaction and the Viola-Seaborg-Sobiczewski formulae. Generalized Liquid Drop Model predictions are provided for the ensuremath{alpha} decay half-lives of other superheavy nuclei using the Finite Range Droplet Model

Spontaneous fission half-lives of heavy and superheavy nuclei within a generalized liquid drop model

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Production of new superheavy Z=108-114 nuclei with U-238, Pu-244, and Cm-248,Cm-250 targets

and compared with the values derived from the VSS formulae.

Plasma expression level of miRNA let-7 is positively correlated with carotid intima-media thickness in patients with essential hypertension.

Within the framework of a dinuclear system (DNS) model, the evaporation-residue excitation functions and the quasi-fission mass yields in the 48Ca induced fusion reactions are investigated systematically and compared with available experimental data. Maximal production cross sections of superheavy nuclei based on stable actinide targets are obtained. Isotopic trends in the production of the superheavy elements Z = 110, 112–118 based on the actinide isotopic targets are analyzed systematically. Optimal evaporation channels and combinations as well as the corresponding excitation energies are proposed. The possible factors that influencing the isotopic dependence of the production cross sections are analyzed. The formation of the superheavy nuclei based on the isotopes U with different projectiles are also investigated and calculated.

A statistical approach to describe highly excited heavy and superheavy nuclei

In order to diagnose the electron cyclotron resonance (ECR) plasma, electron bremsstrahlung spectra were measured by a HPGe detector on Lanzhou ECR Ion Source No. 3 at IMP. The ion source was operated with argon under various working conditions, including different microwave power, mixing gas, extraction high voltage (HV), and so on. Some of the measured spectra are presented in this article. The dependence of energetic electron population on mixing gas and extraction HV is also described. Additionally, we are looking forward to further measurements on SECRAL (Superconducting ECR Ion Source with Advanced design at Lanzhou).

Influence of entrance channels on the formation of superheavy nuclei in massive fusion reactions

We systematically calculate the spontaneous fission half-lives for heavy and superheavy nuclei between U and Fl isotopes. The spontaneous fission process is studied within the semi-empirical WKB approximation. The potential barrier is obtained using a generalized liquid drop model, taking into account the nuclear proximity, the mass asymmetry, the phenomenological pairing correction, and the microscopic shell correction. Macroscopic inertial-mass function has been employed for the calculation of the fission half-life. The results reproduce rather well the experimental data. Relatively long half-lives are predicted for many unknown nuclei, sufficient to detect them if synthesized in a laboratory.

Experimental study on the electric-sweep scanner and ion beam emittance of electron cyclotron resonance ion source

Within the framework of the dinuclear system (DNS) model, production cross sections of new superheavy nuclei with charged numbers Z = 108-114 are analyzed systematically. Possible combinations based on the actinide nuclides 238 U, 244 Pu, and 248,250 Cm with the optimal excitation energies and evaporation channels are pointed out to synthesize new isotopes that lie between the nuclides produced in the cold fusion reactions and the 48 Ca-induced fusion reactions experimentally, which are feasible to be constructed experimentally. It is found that the production cross sections of superheavy nuclei decrease drastically with the charged numbers of compound nuclei. Larger mass asymmetries of the entrance channels enhance the cross sections in 2n-5n channels.

Production of proton-rich nuclei around Z = 84-90 in fusion-evaporation reactions

MicroRNAs (miRNA, miR) play vital part in the pathophysiology of arterial remodeling in hypertension patients, and are increasingly becoming novel biomarkers in cardiovascular disease. The study was designed to evaluate the correlation between let-7 expression level and subclinical atherosclerosis in untreated patients with newly diagnosed essential hypertension. We assessed 240 participants including 60 healthy volunteers with normal carotid intima-media thickness (nCIMT), 60 healthy volunteers with increased CIMT (iCIMT), 60 hypertension patients with nCIMT and 60 hypertension patients with iCIMT. All patients underwent measurements of CIMT and ambulatory blood pressure (BP) monitoring. The level of let-7 was quantified using real-time reverse transcription polymerase chain reaction. Correlations of let-7 expression with BP parameters and CIMT were assessed using multiple linear regression analysis. We observed the lowest miRNA let-7 expression (21.70±1.45 vs 29.33±2.58 vs 31.50±1.80 vs 35.49±2.33; P<0.001) in healthy controls with nCIMT, followed by healthy controls with iCIMT, then hypertension patients with nCIMT and highest expression in hypertension patients with iCIMT. Let-7 was independently correlated with CIMT(r=0.587, P<0.001), and multiple linear regression analysis showed that let-7 was independently correlated with CIMT (β=0.031, P<0.001). Our findings provide significant evidence that plasma let-7 could represent a non-invasive marker for atherosclerosis in hypertensive patients and herald the emergence of a potential indicator to monitor end-organ damage in hypertension.