Beam-polarization asymmetries for the p(gamma-->, K+)Lambda and p(gamma-->, K+)Sigma(0) reactions for E(gamma)=1.5-2.4 GeV

Beam polarization asymmetries for the p(gamma-->,K+)Lambda and p(gamma-->,K+)Sigma(0) reactions are measured for the first time for E(gamma)=1.5-2.4 GeV and 0.6相似文献   

Excitation and decay of the isovector giant monopole resonances via the 208Pb(3He,t p) reaction at 410 MeV

The excitation and subsequent proton decay of the isovector spin-flip giant monopole resonance (IVSGMR) is studied via the 208Pb(3He,t) reaction at 410 MeV. In the inclusive spectrum (60+/-5)% of the non-energy-weighted sum-rule strength for this 2 variant Planck's over 2h omega resonance was found in the region 29相似文献   

M1 gamma strength for zirconium nuclei in the photoneutron channel

Photoneutron cross sections were measured for 91Zr, 92Zr, and 94Zr near the neutron separation energy with quasimonochromatic gamma rays. The data exhibit some extra components around the neutron threshold. A coherent analysis of the photoneutron data for 92Zr together with the neutron capture on 91Zr based on the microscopic Hartree-Fock-Bogoliubov plus quasiparticle random-phase approximation model for the E1 strength has revealed the presence of an M1 resonance at 9 MeV. The microscopic approach systematically shows the same M1 strength in the photoneutron cross section for 91Zr and 94Zr. The total M1 strength is about 75% larger than the strength predicted by the systematics, being qualitatively consistent with the giant M1 resonance observed in the inelastic proton scattering.     

Structures and decay of deep-hole states in light nuclei populated by the (p, 2p 2p) reactions

Decay particles from the s-hole states in ¹¹B and ¹⁵N have been measured in coincidence with the quasifree ¹²C(p, 2p) and ¹⁶O(p, 2p) reactions at E _p =392 MeV. Triton decay is found to be dominant for the ¹¹B(s-hole) state and also found to be larger than α decay for the ¹⁵N(s-hole) state despite its smaller Q value compared to α decay. Measured decay branching ratios are discussed in comparison with the results of statistical-model, SU(3)-model, and shell-model calculations. The energy spectra around the s-hole states in both ¹¹B and ¹⁵N exhibit some bumplike structures, which can be qualitatively explained by recent shell-model calculations for both nuclei.     

Isolation and characterization of a new abortifacient protein, karasurin, from root tubers of Trichosanthes kirilowii Max. var. japonicum Kitam

A new abortifacient protein, named karasurin, was isolated from fresh root tubers of Trichosanthes kirilowii MAXIMOWICZ var. japonicum KITAMURA (Cucurbitaceae, Japanese name: kikarasuuri) by the procedure involving acetone fractionation and ion-exchange chromatography on Toyopearlpak SP 650S. Homogeneity of Karasurin was demonstrated by sodium dodecyl sulfate (SDS)-polyacrylamide gel electrophoresis, and high performance liquid chromatography (HPLC). Karasurin was a highly basic protein of pI 10.1 and the molecular weight was estimated as 28000 by SDS-polyacrylamide gel electrophoresis. Karasurin showed a strong abortion effect in pregnant mice.     

Low energy SIMS study on multi-built-up layer of cobalt(II) stearate

The surface of multi-built-up layer of cobalt(II) stearate on copper substrate has been studied by means of low energy SIMS. The sampling surfaces were impacted with 700 eV, 8 × 10^?7 Å/cm², Ar⁺ ions. In each group (odd-numbered accumulated and even-numbered accumulated samples), the ⁵⁸Co⁺ intensities at the initial bombardment responded to the number of the accumulation, respectively. The ⁵⁸Co⁺ ion intensities from even-numbered accumulated samples were observed more than the expected values from a proportionality between the accumulation number and ⁵⁸Co⁺ intensities.     

Synthesis of a highly transparent poly(o‐hydroxyamide) in the i‐line region and its application to photosensitive polymers

A novel poly(σ‐hydroxyamide) (PHA) based photosensitive polymer that exhibits high transparency at 365 nm wavelength (i‐line) has been developed. Time‐dependent density functional theory (TD‐DFT) calculations using the B3LYP hybrid functional were performed to predict the transparencies of various hydroxyamides in the i‐line region. Based on the calculations, 4,4′‐sulfonylbis(σ‐aminophenol) (SAP) was prepared and polymerized with 4,4′‐oxybis(benzoyl chloride) (OBBC), and the resulting PHA, which is abbreviated as PHA‐S, showed a high transparency comparable to that of PHA derived from 4,4′‐(hexafluoroisopropylidene)bis(σ‐aminophenol). Positive‐type photosensitive PHA was then formulated based on PHA‐S with a crosslinker 1,3,5‐tris[(2‐vinyloxy)ethoxy]benzene (TVEB) and a photoacid generator (5‐propylsulfonyloxyimino‐5H‐thiophen‐2‐ylidene)‐2‐(methylphenyl)acetonitrile (PTMA) (17:3:1 in weight ratio), and demonstrated photosensitivity and contrast of 14 mJ/cm² and 2.7, respectively, when the resist film was prebaked at 120 °C for 5 min, irradiated by i‐line, post exposure baked at 120 °C for 5 min, developed with an 2.38 wt% TMAH solution for 5 s. A clear positive image featuring 10‐μm line‐and‐space was also printed in a film which was exposed to 50 mJ/cm² of i‐line by contact‐printing. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 2527–2535, 2005     

Visualization of microvessels by angiography using inverse‐Compton scattering X‐rays in animal models

The fundamental performance of microangiography has been evaluated using the S‐band linac‐based inverse‐Compton scattering X‐ray (iCSX) method to determine how many photons would be required to apply iCSX to human microangiography. ICSX is characterized by its quasi‐monochromatic nature and small focus size which are fundamental requirements for microangiography. However, the current iCSX source does not have sufficient flux for microangiography in clinical settings. It was determined whether S‐band compact linac‐based iCSX can visualize small vessels of excised animal organs, and the amount of X‐ray photons required for real time microangiography in clinical settings was estimated. The iCSX coupled with a high‐gain avalanche rushing amorphous photoconductor camera could visualize a resolution chart with only a single iCSX pulse of ～3 ps duration; the resolution was estimated to be ～500 µm. The iCSX coupled with an X‐ray cooled charge‐coupled device image sensor camera visualized seventh‐order vascular branches (80 µm in diameter) of a rabbit ear by accumulating the images for 5 and 30 min, corresponding to irradiation of 3000 and 18000 iCSX pulses, respectively. The S‐band linac‐based iCSX visualized microvessels by accumulating the images. An iCSX source with a photon number of 3.6 × 10³–5.4 × 10⁴ times greater than that used in this study may enable visualizing microvessels of human fingertips even in clinical settings.     

Dipole excitation of alpha clusters in (6)Li and (7)Li

Dipole excitations in highly excited energy regions of (6)He and (7)He nuclei were investigated via the ((7)Li,(7)Be) reaction with an incident energy of 65A MeV at forward scattering angles. The resonances at Q approximately equal to -30 MeV observed commonly for both (6)Li and (7)Li targets were found to be excited via both spin-flip and spin-nonflip transitions with DeltaL = 1. Based on the observed excitation energy, width, and cross section of each resonance, the relevant resonances are inferred to be analogs of the dipole resonances of alpha clusters in the (6)Li and (7)Li nuclei.     

Evidence for a narrow S = +1 baryon resonance in photoproduction from the neutron

The gamman-->K(+)K(-)n reaction on 12C has been studied by measuring both K+ and K- at forward angles. A sharp baryon resonance peak was observed at 1.54+/-0.01 GeV/c(2) with a width smaller than 25 MeV/c(2) and a Gaussian significance of 4.6sigma. The strangeness quantum number (S) of the baryon resonance is +1. It can be interpreted as a molecular meson-baryon resonance or alternatively as an exotic five-quark state (uuddsmacr;) that decays into a K+ and a neutron. The resonance is consistent with the lowest member of an antidecuplet of baryons predicted by the chiral soliton model.