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11.
Wladyslaw Biernacki Janusz Dabrowski Andrzej Ejchart 《Magnetic resonance in chemistry : MRC》1972,4(4):443-447
The role of steric factors in magnetic non-equivalence anisochronism of complex geminal groups and of their fragments in compounds of the general formula RCH(Ph)CH(COOR′)2 has been investigated. CMR anisochronism is more sensitive to conformational and other steric changes than is PMR. 相似文献
12.
S. Yu. Torilov K. A. Gridnev V. I. Zherebchevsky M. Brenner L. I. Vinogradov V. Z. Goldberg T. V. Korovitskaya T. Lönnroth N. A. Maltsev M. Mutterer B. G. Novatskii M. Norrby J. M. K. Slotte Yu. G. Sobolev W. H. Trzaska G. P. Tyurin S. V. Khlebnikov 《JETP Letters》2011,94(1):6-10
High-spin states of the 22Ne nucleus in the excitation energy range of 15–30 MeV have been studied. The angular correlation method has been used to determine the spins of excited states. A number of new states with high angular momenta—20.0 MeV (9?), 20.7 MeV (11?), 21.6 MeV (9?), 22.2 MeV (12+), and 25.0 MeV (9?)—have been revealed. They are intensely populated in the reaction 14C(12C, α1)22Ne* → α2 + 18O and correspond to the rotational bands of various structures. 相似文献
13.
F. Gönnenwein P. Jesinger M. Mutterer W. H. Trzaska G. A. Petrov A. M. Gagarski V. Nesvizhevsky P. Geltenbort 《Acta Physica Hungarica A》2003,18(2-4):419-425
Quaternary fission is a nuclear reaction where the two customary fragments from fission are accompanied by two light charged particles. The process has been investigated at the ILL, Grenoble, for thermal neutron induced fission of 233U and 235U. The light particles were identified to be α particles and H isotopes (mostly tritons). Two different types of processes could be disentangled: in one of these processes all four charged particles are born in coincidence while the second process is in fact merely a special case of ternary fission where the ternary particle decays into two charged particles before reaching the detectors. 相似文献
14.
Yu. N. Kopatch M. Mutterer P. Jesinger J. von Kalben I. Kojouharov H. Schaffner H. -J. Wollersheim N. Kurz E. Lubkiewicz P. Adrich H. Sharma A. Wagner Z. Mezentseva W. H. Trzaska A. Krasznahorkay F. Gönnenwein 《Acta Physica Hungarica A》2003,18(2-4):399-402
A new multiparameter experiment on ternary fission of 252Cf has recently been successfully performed by using the CODIS2 detector system and two GSI segmented Super Clover Ge γ-ray detectors. The experimental setup and the main subjects of interest are briefly described. 相似文献
15.
P. Jesinger A. Kötzle F. Gönnenwein M. Mutterer J. von Kalben G. V. Danilyan V. S. Pavlov G. A. Petrov A. M. Gagarski W. H. Trzaska S. M. Soloviev V. V. Nesvizhevski O. Zimmer 《Physics of Atomic Nuclei》2002,65(4):630-636
Ternary fission induced by cold polarized neutrons was studied for the two isotopes 233U and 235U at the Institut Laue-Langevin in Grenoble, France. In particular two types of angular correlations between the spin of the incoming neutrons and the emission directions of both, the fission fragments (FF) and the ternary particles (TP), were investigated. For FF and TP detectors facing the target at right angles to the neutron beam, first, for longitudinally polarized neutrons a triple correlation between spin and the emission of outgoing particles was explored and, second, for transversally polarized neutrons parity violating asymmetries in the emission of FFs and TPs were analyzed. Nonzero expectation values for the triple correlation were oberserved in the present experiments for the first time. 相似文献
16.
High precision measurements of the 18O/16O ratio in bis-(5,5-dimethyl-2-oxo-1,3,2-P-dioxaphosphorinanyl)-sulfide and P1-oxo-P2-thiono(5,5-dimethl-1,3,2-dioxaphosphorinanyl)oxidee have been carrid out using a Finnigan 4000 mass spectrometer. 相似文献
17.
A. Passoja R. Julin J. Kantele J. Kumpulainen M. Luontama W. Trzaska 《Nuclear Physics A》1985,438(2):413-428
The E0 and E2 transitions depopulating the excited 0+ states in 64,66,68Zn are investigated. Several methods of γ-ray, conversion-electron and internal-pair spectrometry are employed, including a new time measurement technique. A total of 5 E0 transitions are observed and the monopole strengths ρ2(0i+ → 0i+) for most of them are extracted. The results and the nature of the excited 0+ states are discussed in terms of several nuclear models. 相似文献
18.
La Cognata M Spitaleri C Mukhamedzhanov AM Irgaziev B Tribble RE Banu A Cherubini S Coc A Crucillà V Goldberg VZ Gulino M Kiss GG Lamia L Mrazek J Pizzone RG Puglia SM Rapisarda GG Romano S Sergi ML Tabacaru G Trache L Trzaska W Tumino A 《Physical review letters》2008,101(15):152501
The 18O(p,alpha)15N reaction is of primary importance in several astrophysical scenarios, including fluorine nucleosynthesis inside asymptotic giant branch stars as well as oxygen and nitrogen isotopic ratios in meteorite grains. Thus the indirect measurement of the low energy region of the 18O(p,alpha)15N reaction has been performed to reduce the nuclear uncertainty on theoretical predictions. In particular the strength of the 20 and 90 keV resonances has been deduced and the change in the reaction rate evaluated. 相似文献
19.
Waruna Kiridena Sanka N. Atapattu Colin F. Poole Wladyslaw W. Koziol 《Chromatographia》2008,68(7-8):491-500
Differences in the system constants of the solvation parameter model and retention factor correlation plots for varied solutes are used to study the retention mechanism on XBridge C8, XBridge Phenyl and XTerra Phenyl stationary phases with acetonitrile–water and methanol–water mobile phases containing from 10 to 70% (v/v) organic solvent. These stationary phases are compared with XBridge C18 and XBridge Shield RP18 characterized in an earlier report using the same protocol. The XBridge stationary phases are all quite similar in their retention properties with larger difference in absolute retention explained by differences in cohesion and the phase ratio, mainly, and smaller changes in relative retention (selectivity) by the differences in individual system constants and their variation with mobile phase type and composition. None of the XBridge stationary phases are selectivity equivalent but XBridge C18 and XBridge Shield RP18 have similar separation properties, likewise so do XBridge C8 and XBridge Phenyl, while the differences between the two groups of two stationary phases is greater than the difference within either group. The limited range of changes in selectivity is demonstrated by the high coefficient of determination (>0.98) for plots of the retention factors for varied compounds on the different XBridge phases with the same mobile phase composition. 相似文献
20.
K. B. Gikal E. M. Kozulin A. A. Bogachev N. T. Burtebaev A. V. Edomskiy I. M. Itkis M. G. Itkis G. N. Knyazhev K. V. Kovalchuk T. N. Kvochkina E. Piasecki V. A. Rubchenya S. K. Sahiev W. H. Trzaska E. Vardaci 《Physics of Atomic Nuclei》2016,79(9-10):1367-1374
The mass-energy distributions and cross sections of proton-induced fission of 232Th have been measured at the proton energies of 7, 10, 13, 20, 40, and 55 MeV. Experiments were carried out at the proton beam of the K-130 cyclotron of the JYFL Accelerator Laboratory of the University of Jyväskylä and U-150m cyclotron of the Institute of Nuclear Physics, Ministry of Energy of the Republic of Kazakhstan. The yields of fission fragments in the mass range A = 60–170 a.m.u. have been measured up to the level of 10?4%. The three humped shape of the mass distribution up has been observed at higher proton energies. The contribution of the symmetric component grows up with increasing proton incident energy; although even at 55 MeV of proton energy the shoulders in the mass energy distribution clearly indicate the asymmetric fission peaks. Evolution of shell structure was observed in the fission fragment mass distributions even at high excitation energy. 相似文献