Angular distributions of the reactions C12(d, p), N14(d, α) and Al27(d, α)

Williamson, John

doi:10.1016/0029-5582(65)90305-6

Cited by 17 publications

(8 citation statements)

References 42 publications

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“…als epileptischer Nystagmus bezeichnet werden, Lidflattern bzw. raschem Blinzeln sowie vorwiegend kontraversiven tonischen Blick-und Kopfwendungen (27,37,67,68,70). Im Rahmen okzipitaler epileptischer Anfälle können auch mannigfaltige Kombinationen sensorischer und/oder motorischer Symptome auftreten.…”

Section: Einleilungunclassified

Zur Frage der epileptischen Aktivität des Okzipitallappens

Schäffler

Karbowski²

1988

Fortschr Neurol Psychiatr

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Our analysis of the course of illness in 14 patients, whose common electroencephalographic characteristic was epileptogenic activity in the occipital area, showed very different clinical symptoms. The first group comprised patients who presented bilateral amaurosis. In four of these cases, the occipital hypersynchronous EEG activity was merely a secondary symptom of either ischaemic hypoxia or of a degenerative process in the occipital visual cortex and was not responsible for the genesis of the actual blindness. In two further cases of monosymptomatic temporary loss of vision, it was difficult to make a differential diagnosis between ictal blindness, respectively status epilepticus amauroticus occurring in a occipital lobe epilepsy and a migraine attack involving the basilar territory. The second group comprised five patients with paroxysmal visual hallucinations respectively illusions. Three of them suffered from hallucinations of the elementary type, respectively flickering fits in the hemianopic field, symptoms which are based on discharges in the visual cortex of the occipital lobe. In a case of one patient with complex visual hallucinations as well as in a further case with visual illusions, it was not possible to find out with certainty their place of origin. A study of these cases shows that the cortical or sub-cortical functional disturbance within the visual system causing the various optical deformations and visual hallucinations, form an inhomogeneous group with different etiology. In the only patient belonging to the third group, whose seizures were i.a. characterized through motor phenomena in the field of the ocular organs and the tonic lateral turning movement of the bulbi of the eyes and of the head, an occipital epileptic crisis with spread of discharges from the occipital pole to the frontomesial surface should be assumed. The occurrence of complex partial seizures, respectively generalized tonic-clonic attacks in two patients of the fourth group who have definite epileptogenic EEG-activity in the occipital area, can be explained by a propagation of paroxysmal activity to the temporal lobe or to the motor cortex. Because of the marked tendency to propagation of the hypersynchronous activity originating in the occipital lobe, many combinations of sensory and/or motor symptoms can occur within the frame-work of occipital epileptic seizures. On the basis of one scalp EEG finding, no final localizing conclusions may be drawn here.

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Section: Einleilungunclassified

Zur Frage der epileptischen Aktivität des Okzipitallappens

Schäffler

Karbowski²

1988

Fortschr Neurol Psychiatr

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“…The measured angular distributions are compared in terms of the Legendre coefficients with the earlier experimental resuhs [2,4] in Fig. 7.…”

Section: Discussionmentioning

confidence: 99%

“…Spins, parities, as well as neutron, proton and deuteron reduced widths of five 14N levels were identified by least square fits of the theoretical angular distribution formula for many-level resonance reactions. In the same energy region, WILLIAMSON [4] studied the energy dependence of the distributions and observed, for the first time, significant Legendre components above L = 4. Two tentative spin assignments were made unambiguous by this very detailed experiment.…”

Section: Introductionmentioning

confidence: 99%

Angular distributions of the reaction12C(d,p)13C belowE d=2 MeV

et al. 1969

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Excitation functions of the 12C(d, Po) and 12C(d, d) reactions were measured at 90 ~ in the range E a = 900--2000 keV in 10 keV steps. Angular distributions of the 12C(d, p0)~aC reaction were measured in steps of 25 keV. The experimental data are interpreted in terms of interfering compound levels. Interference phenomena suggest additional new levels in ltN. l. IntroductionAngular distributions of the 12C(d,p0)13C reaction in the range Ea = =800--1500 keV were first measured by PHILLIrS [1] who also suggested spins and parities for the compound levels. SARMA et al.[2] determined angular distributions at 17 different bombarding energies in the same range. On assuming a pure compound nuclear reaction mechanism, these authors succeeded in assigning spins to four of the five known levels of 14N in the energy range concerned. The parity and spin assignments were made on the assumption that the neutron and proton reduced widths of the highly excited states in the N = Z nucleus 14N were of the same order of magnitude. Angular distributions of the (d, d), (d, p~) and (d, Pl) reactions were measured by KASHY et al. [3] up to 2 MeV. Spins, parities, as well as neutron, proton and deuteron reduced widths of five 14N levels were identified by least square fits of the theoretical angular distribution formula for many-level resonance reactions. In the same energy region, WILLIAMSON [4] studied the energy dependence of the distributions and observed, for the first time, significant Legendre components above L = 4. Two tentative spin assignments were made unambiguous by this very detailed experiment. The results of [1--4] ate summarized in Table I. However, every previous attempt had failed to reproduce the angular distributions above Ed = 1500 keV in terms of overlapping levels. Some of the authors [3] suspect the existence of several unidentified compound states in this region. --Resonances at Ea = 1730 keV and 1950 keV are known from 12C(d, n)~3N reaction [5, 6] but have not yet been observed in (d, p) processes.--As regards the non-resonant contribution, ir seems to play an important

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“…Instead, a number of different (n 2 ) operations must be efficiently parallelized. The practically relevant applications for Maxcut (graphs derived from VLSI applications [6,40] and the Ising model) are typically extremely sparse (for example, |E| ≈ 2|V | for most of the VLSI graphs in Table V).…”

Section: The Parallelization and Its Analysismentioning

confidence: 99%

“…It has been observed [6,8,9,29] that one of the phases (the layer assignment problem) in the design process for VLSI chips and printed circuit boards can be reduced to the Maxcut problem. We have run the GW algorithm on ten graphs derived from VLSI problems [40].…”

Section: The Graphs and The Algorithmsmentioning

confidence: 99%