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Your search keyword '"Xu, H. S."' showing total 5 results
Start Over Author "Xu, H. S." Topic protons
5 results on '"Xu, H. S."'

1. Mass Measurements of Proton-rich Nuclides at the Cooler Storage Ring at IMP.

Author

Zhang, Y. H., Tu, X. L., Xu, H. S., Wang, M., Litvinov, Yu. A., Sun, Y., Schatz, H., Zhou, X. H., Yuan, Y. J., Xia, J. W., Audi, G., Blaum, K., Du, C. M., Geng, P., Hu, Z. G., Huang, W. X., Jin, S. L., Liu, L. X., Liu, Y., and Ma, X.

Subjects
MASS measurement, NUCLIDES, PROTONS, MASS spectrometry, RADIOISOTOPES, HEAVY ions, FRAGMENTATION reactions, NUCLEAR energy, NUCLEOSYNTHESIS
Abstract

Recent results and progress of mass measurements of proton-rich nuclei using isochronous mass spectrometry (IMS) are reported. The nuclei under investigation were produced via fragmentation of relativistic energy heavy ions of 78Kr and 58Ni. After in-flight separation by the fragment separator RIBLL-2, the nuclei were injected and stored in the experimental storage ring CSRe, and their masses were determined from measurements of the revolution times. The impact of these measurements on the stellar nucleosynthesis in the rp-process is discussed. [ABSTRACT FROM AUTHOR]

Published
2011
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2. Recent experimental results of two-proton correlated emission from the excited states of 17,18Ne and 28,29S.

Author

Lin, C. J., Xu, X. X., Jia, H. M., Yang, F., Jia, F., Wu, Z. D., Zhang, S. T., Liu, Z. H., Zhang, H. Q., Xu, H. S., Sun, Z. Y., Wang, J. S., Hu, Z. G., Wang, M., Chen, R. F., Zhang, X. Y., Li, C., Lei, X. G., Xu, Z. G., and Xiao, G. Q.

Subjects
NUCLEAR excitation, PROTONS, SILICON diodes, NEON isotopes, SULFUR isotopes, RADIOACTIVE nuclear beams, KINEMATICS
Abstract

Two-proton emissions from the excited states of 17,18Ne and 28,29S were investigated by the radioactive beams bombarding on the 197Au target via the Coulomb excitation. The complete-kinematics measurements were actualized by the stacks of silicon-strip detectors and CsI+PIN array detectors. The invariant mass of final systems as well as the relative momentum, opening angle, and relative energy of the two emitted protons were reconstructed under the framework of relativistic kinematics. The mechanisms of two-proton emission were analyzed in a simple schematic model. With the help of Monte-Carlo simulations, the two protons emitted from the 6.15 MeV excited state of 18Ne and the excited states around 10 MeV of 29S, respectively, exhibit prominent features of 2He decay. While for the other states, no obvious diproton emissions were observed. [ABSTRACT FROM AUTHOR]

Published
2011
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3. The Role of Proton for the Effect of Interlayer on Ferroelectric Behavior of Poly(vinylidene fluoride-trifluoroethylene) Copolymer Ultrathin Films.

Author

Xu, H. S., Zhang, Y. N., Zhang, X. L., and Ma, Y. P.

Subjects
*COPOLYMERS, *FLUOROPOLYMERS, *ELECTRIC properties of thin films, *PROTONS, *FERROELECTRICITY, *ELECTRODES, *CAPACITORS, *MATERIAL fatigue
Abstract

A functional interlayer, poly(3,4-ethylene dioxythioohene)-poly(styrene sulfonic) acid, is introduced as a buffer layer between the metal electrodes of a capacitor composed of ferroelectric poly(vinylidene fluoridetrifluoroethylene) copolymer ultrathin film. The sandwiched structure shows prominent ferroelectric properties even as the thickness of P(VDF-TrFE) film is reduced to 50 nm and the fatigue property is also improved tremendously. We demonstrate that the proton in the PSSH instead of the electron in the PEDOT plays a significant role to improve the ferroelectric properties of P(VDF-TrFE), furthermore, polyvinyl phosphoric acid as well as other polyacid also supplies the proton. [ABSTRACT FROM AUTHOR]

Published
2011
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4. Two-proton Halo and Two-proton Emission Nucleus: 29S.

Author

Lin, C. J., Xu, X. X., Zhang, G. L., Yang, F., Zhang, H. Q., Liu, Z. H., Zhang, C. L., Zhou, P., Wu, X. K., An, G. P., Jia, H. M., Xu, H. S., Xiao, G. Q., Zhang, W. L., Guo, Z. Y., Sun, Z. Y., and Hu, Z. G.

Subjects
PHYSICS experiments, PROTONS, MOMENTUM distributions, NUCLEAR reactions, COLLISIONS (Nuclear physics)
Abstract

An experiment of 29S bombarding on 12C target was performed to study the phenomena of two-proton halo and two-proton emission. The 1p and 2p removal cross sections for 29S are 3.15±0.32 b and 1.85±0.20 b, respectively. The 2p removal cross section is abnormally large. It denotes the two-proton occurs to be a halo distribution. Among the 2p-27Si coincident events, a strong correlation between two protons was found. The small correlation angle indicates these two protons might come from 2He cluster emission. Moreover, the relative momentum distribution shows the two protons locate originally at singlet 2s state and emit with strong interaction. [ABSTRACT FROM AUTHOR]

Published
2007
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5. Thermonuclear 42Ti(p,y)43V rate in type-I x-ray bursts.

Author

He, J. J., Parikh, A., Brown, B. A., Rauscher, T., Hou, S. Q., Zhang, Y. H., Zhou, X. H., and Xu, H. S.

Subjects
*X-ray bursts, *PROTONS, *COULOMB functions, *ENERGY measurement, *BOUND states
Abstract

The thermonuclear rate of the 42Ti(p,y)43V reaction has been reevaluated based on a recent precise proton separation energy measurement of Sp(43V) = 83 ± 43 keV. The astrophysical impact of our new rates has been investigated through one-zone postprocessing type-I x-ray burst calculations. It shows that the new experimental value of Sp significantly affects the yields of species for A ∠ 40--45. As well, the precision of the recent experimental Sp value constrains these yields to better than a factor of 3. [ABSTRACT FROM AUTHOR]

Published
2014
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