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排序方式: 共有187条查询结果,搜索用时 31 毫秒
1.
R. Schuch I. Bergström K. Blaum T. Fritioff Sz. Nagy A. Solders M. Suhonen 《Hyperfine Interactions》2006,173(1-3):73-83
We report here about measurements of reaction and decay Q values by precise determination of pairs of atomic masses. These were performed with the Penning trap mass spectrometer SMILETRAP.
Measurements with Penning traps give reliable and accurate masses, in particular Q values, due to the fact that certain systematic errors to a great deal cancel in the mass difference between the two atoms
defining the Q value. Some Q values that are of fundamental interest will be discussed here, for example, a new Q value for the 6Li (n,γ) 7Li reaction, for the β-decay of tritium, related to properties of the electron neutrino mass, and for the neutrino-less double
β-decay of 76Ge, related to the question of whether the neutrino is a Majorana particle or not. In case of the latter two we report the
most accurate Q values, namely 18,589.8(12) eV for the tritium decay and 2,038.997(46) keV for the neutrino-less double β-decay of 76Ge. 相似文献
2.
W. Zong D. R. DeWitt R. Schuch H. Gao S. Asp E. Justiniano 《Hyperfine Interactions》1996,99(1):325-331
We report here an observation ofn=1 dielectronic recombination resonances of boron-like argon in the energy region 140–195 eV. With the cooler's electron beam as a target, a resolution of approximately 0.6 eV FWHM was obtained in the observed energy range. The energies of the doubly excited states were estimated with a Hartree-Fock calculation, which indicates that the observed resonances are from Ar13+(1s22s22p) to Ar12+(1s22s23l3l) and Ar12+(1s22s2p3l3l) transitions. 相似文献
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The reaction of a clean Ti (0001) surface with oxygen gas at low pressure and room temperature has been studied with low-energy electron diffraction (LEED) and Auger electron spectroscopy (AES). At low exposures (about 1 Langmuir) ap(2×2) superstructure is observed which gradually converts to 1×1 at high exposures (about 100 Langmuirs). The LEED spectra confirm that the final 1×1 structure is different from that of clean Ti (0001), while the AES spectra indicate that the final oxide is probably TiO, not TiO2. The plausibility of this indication is discussed. 相似文献
6.
L. A. Schuch D. J. R. Nordemann W. O. Barreto A. Cardoso A. Zago 《Journal of Radioanalytical and Nuclear Chemistry》1994,177(1):39-49
Soil samples from Paraná State, Brazil, were collected in 1991 and compared with others collected at the same location in March 1977 and at the end of 1983. Pedological analyses were practiced on these samples and137Cs and232Th,226Ra and40K activities were determined by gammaray spectrometry. A latitude dependence of137Cs was found as well. It was impossible to determine the137Cs contribution from Chernobyl nuclear accident because of low fallout and intense leaching, erosion and re-suspension in soils of regions with high annual precipitation. Natural radionuclides did not show such effects. 相似文献
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