Momentum Distribution of a Fragment and Nucleon Removal Cross Section in the Reaction of Halo Nuclei

Recently the research on the halo structure of drip-line nuclei has shown some interesting properties of the existence of one or more halo nucleons. In the framework of few-body Glauber model, the momentum distribution of a fragment and nucleon removal cross section in the reaction of halo nuclei is presented and extended to nuclei having more than one halo nucleons. The reaction mechanism is treated with and without taking account of the final-state interaction. The wave function of removal halo nucleons in the continuum state is modified by imposing an orthogonal condition to the bound state. An analytical expression of the longitudinal momentum distribution of the fragment is derived when the bound state wave function of halo nucleons is taken as a Gaussian-type function. This is useful in the further investigation on the structure of halo nuclei.

New heavy neutron-rich isotope ^(238)Th

A new nuclide (238)Th has been produced via multinucleon transferreaction by 60 MeV/u 18O ion irradiation of the natural uranium. The thorium wasradiochemically separated from the fixture of uranium and reaction products. Theactivity of thorium was measured by using an HPGe detector and a planar HPGedetector. The 238Th has been identified for the first time by measuring the growthand decay of the 7-rays from its daughter 238Pa. The half-life of 238Th was determinedto be 9.4f2.0 min. In addition, a new 7-ray of 89.010.3 keV with TI/2=8.911.5minwas found in the 7 spectrum gated with X-rays of Pa and assigned to 238Th P-- decaybased on measurements of transition energy and half life.

Evaporation Residue Cross-sections of Super-heavy Nuclear Production

To synthesize new superheavy nuclei a better understanding of the physics conception on the production mechanism is very important. Several theoretical models have been developed to describe the reaction dynamical mechanism. Among them Adamian et al.have investigated the reaction mechanism of the superheavy element (SHE) formation in the concept of a dinuclear system (DNS) which is proved to be a powerful tool

Ginsenoside Rg3 inhibits colon cancer cell migration by suppressing nuclear factor kappa B activity

OBJECTIVE: To study the mechanism of the inhibitory effect of ginsenoside Rg3 on colon cancer cell migration.METHODS: Transwell migration assays were performed to investigate the inhibitory effect of ginsenoside Rg3 on SW480 cell migration. Electrophoretic mobility shift assays(EMSAs) and dual luciferase reporter assays were used to study the suppression capability of Rg3 on nuclear factor kappa B(NF-κB) activity. Western blotting was adopted to determine protein levels.RESULTS: Two-hundred micromolar ginsenoside Rg3 significantly inhibited SW480 cell migration(P < 0.05). EMSA showed that Rg3 suppressed the DNA binding ability of NF-κB. Dual luciferase reporter assay showed that Rg3 decreased NF-κB-regulated gene transcription(P < 0.01). Western blots indicated that Rg3 down-regulated expression of the NF-κB-regulated matrix metalloproteinase 9,cyclooxygenase-2 and C-Myc. An NF-κB inhibitor,pyrrolidine dithiocarbamate,enhanced the inhibitory effect of Rg3 on SW480 cell migration.CONCLUSION: Ginsenoside Rg3 has a strong antitumor migration capability by suppressing NF-κB activity and expression of NF-κB-regulated gene products. It could be a good adjuvant for colon cancer patients during the course of chemotherapy.

The analysis of X-ray response of CdZnTe detectors

CdZnTe is an excellent material candidate for high efficiency,high-resolution room-temperature nuclear radiation detectors,and the CdZnTe detectors are being widely used in medicine,industry,safeguard and scientific X-ray and γ-ray imaging and spectroscopic applications.In this work,three CdZnTe planar detectors with different grades,named CZT-1,CZT-2 and CZT-3,respectively,were fabricated.And the effects of mobility,lifetime and de-trapping time on the performance of CdZnTe planar detector,such as the energy resolution,charge collection efficiency and peak to valley ratio,were analyzed.The charge collection efficiency depends on the product of carrier mobility and lifetime,which has a great effect on the energy resolution of detector when the efficiency is less than 90%.The de-trapping time of carriers in deep levels should be responsible for the peak to valley ratio and "polarization".