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排序方式: 共有159条查询结果,搜索用时 15 毫秒
81.
Wang B Bocquet ML Günther S Wintterlin J 《Physical review letters》2008,101(9):099703; author reply 099704
82.
A lightweight microfoil conversion electron detector has been built for use as a detector/analyser for selective excitation double Mössbauer experiments. The detector weighs approximately 40 g; it can be moved with constant acceleration by a conventional electromechanical drive, with peak velocities up to ±15 mm/s. Conversion electrons from resonant absorption events are collected from both sides of two 0.3 μm thick57Fe-enriched stainless steel foils inside the detector. The detector's performance (signal to noise per unit time) has been compared with a potassium ferrocyanide absorber and proportional counter, and it is found to be about ten times better for a given source strength and sampling angle. The overall detector linewidth is 0.42 (2) mm/s, compared with 0.37 (1) mm/s for the PFC absorber. 相似文献
83.
R. Stippler F. Münnich H. Schrader J. P. Bocquet M. Asghar G. Siegert R. Decker B. Pfeiffer H. Wollnik E. Monnand F. Schussler 《Zeitschrift für Physik A Hadrons and Nuclei》1978,284(1):95-104
The beta-decay energy of 20 nuclides in the mass region 88≦A≦102 has been measured using the on-line mass separator LOHENGRIN. The experimental values obtained are compared with theoretical predictions of different mass formulae. 相似文献
84.
G. Bailleul J. P. Bocquet H. Schrader R. Stippler B. Pfeiffer M. Asghar C. Chauvin J. P. Gautheron J. Greif G. Siegert P. Armbruster H. Ewald J. Blachot E. Monnand F. Schussler 《Zeitschrift für Physik A Hadrons and Nuclei》1975,273(3):283-289
γ-spectra and half-lives of90Br,95Rb,96Rb,96Sr,96Y,132Sb and132Sn have been measured using the unslowed fission fragment separator “Lohengrin”. Preliminary decay schemes for90Kr,95Sr,96Sr and96Y are given. 相似文献
85.
G. Mariolopoulos Ch. Hamelin J. Blachot J.P. Bocquet R. Brissot J. Crançon H. Nifenecker Ch. Ristori 《Nuclear Physics A》1981,361(1):213-241
Radiochemical and energy loss techniques have been used to measure fragment charge distributions in the systems 229Th(nth, f), 235U(n3 MeV, f) and 252Cf(s, f). Together with those previously obtained [233, 235U(nth, f) and 239, 241Pu(nth, f] the results show that these charge distributions depend very sensitively on both the fissioning species and the initial excitation energy. Very strong even-odd effects are present, for example in the charge distribution of 229Th(nth, f) while they almost disappear in 235U(n3 MeV, f). In the 229Th(nth f) and 252Cf(s, f) cases, kinetic energy distributions of the fragments have been obtained. Fragments with even charges are more energetic, on average, than fragments with odd charges. The results are discussed in terms of a rather small probability for pair breaking during the transition from saddle-point to scission. The relationship between even-odd effects in charge distributions and fine structures in mass distributions is also investigated. 相似文献
86.
M. Djebara M. Asghar J.P. Bocquet R. Brissot M. Maurel H. Nifenecker CH. Ristori 《Nuclear Physics A》1984,425(1):120-140
A gas ΔE ? ER telescope has been used to measure charge yields and their correlations with kinetic energies for 229Th and 232U. Even-charge yields are enhanced compared with odd-charge yields for both fissioning systems; this enhancement increases for events with higher kinetic energy. The mean odd-even effect ; it is . The energy-integrated δp and δp for different energy windows, vary strongly as a function of charge (Z) due to the underlying shells. The δp averaged over Z increases fast with kinetic energy, contrary to the existing results for 233U and 235U, where δp flattens off at low energies. For both systems, the most probable kinetic energy ē shows a strong odd-even stagger; the mean odd-even effect on energy, the latter is about twice the value for . These results are discussed in terms of the existing models. 相似文献
87.
The authors determined, by spcctrophotometric and potentiometric methods, the ionization constants of 2-phenyl-8-quinolinol in hydroalcoholic solutions. 相似文献
88.
89.
Bocquet B Bernardinelli G Ouali N Floquet S Renaud F Hopfgartner G Piguet C 《Chemical communications (Cambridge, England)》2002,(9):930-931
A tris-tridentate segmental ligand has been designed for the self-assembly of homotrimetallic triple-stranded lanthanide helicates possessing different coordination sites along the threefold axis. 相似文献
90.
A. Lleres O. Bartalini V. Bellini J. P. Bocquet P. Calvat M. Capogni L. Casano M. Castoldi A. D'Angelo J. -P. Didelez R. Di Salvo A. Fantini C. Gaulard G. Gervino F. Ghio B. Girolami A. Giusa M. Guidal E. Hourany V. Kouznetsov R. Kunne A. Lapik P. Levi Sandri D. Moricciani A. N. Mushkarenkov V. Nedorezov L. Nicoletti C. Perrin C. Randieri D. Rebreyend F. Renard N. Rudnev T. Russew G. Russo C. Schaerf M. -L. Sperduto M. -C. Sutera A. Turinge 《The European Physical Journal A - Hadrons and Nuclei》2007,31(1):79-93
Beam asymmetries and hyperon recoil polarizations for the reactions γp → K
+Λ and γp → K
+Σ0 have been measured from the threshold production to 1500MeV with the GRAAL facility located at the ESRF in Grenoble. These
results complement the database for the beam asymmetry, covering for the first time the production threshold region. Recent
theoretical analyses are presented for which the beam asymmetry data bring interesting new information and allow to better
determine some resonance parameters. Most importantly, these results strengthen the need of a new D13 state around 1900MeV. 相似文献