Large enhancement of deuteron polarization with frequency modulated microwaves

We report a large enhancement of 1.7 in deuteron polarization up to values of 0.6 due to frequency modulation of the polarizing microwaves in a two liters polarized target using the method of dynamic nuclear polarization. This target was used during a deep inelastic polarized muon-deuteron scattering experiment at CERN. Measurements of the electron paramagnetic resonance absorption spectra show that frequency modulation gives rise to additional microwave absorption in the spectral wings. Although these results are not understood theoretically, they may provide a useful testing ground for the deeper understanding of dynamic nuclear polarization.Comment: 10 pages, including the figures coming in uuencoded compressed tar files in poltar.uu, which also brings cernart.sty and crna12.sty files neede

Velocity-space sensitivity of the time-of-flight neutron spectrometer at JET

The velocity-space sensitivities of fast-ion diagnostics are often described by so-called weight functions. Recently, we formulated weight functions showing the velocity-space sensitivity of the often dominant beam-target part of neutron energy spectra. These weight functions for neutron emission spectrometry (NES) are independent of the particular NES diagnostic. Here we apply these NES weight functions to the time-of-flight spectrometer TOFOR at JET. By taking the instrumental response function of TOFOR into account, we calculate time-of-flight NES weight functions that enable us to directly determine the velocity-space sensitivity of a given part of a measured time-of-flight spectrum from TOFOR

Relationship of edge localized mode burst times with divertor flux loop signal phase in JET

A phase relationship is identified between sequential edge localized modes (ELMs) occurrence times in a set of H-mode tokamak plasmas to the voltage measured in full flux azimuthal loops in the divertor region. We focus on plasmas in the Joint European Torus where a steady H-mode is sustained over several seconds, during which ELMs are observed in the Be II emission at the divertor. The ELMs analysed arise from intrinsic ELMing, in that there is no deliberate intent to control the ELMing process by external means. We use ELM timings derived from the Be II signal to perform direct time domain analysis of the full flux loop VLD2 and VLD3 signals, which provide a high cadence global measurement proportional to the voltage induced by changes in poloidal magnetic flux. Specifically, we examine how the time interval between pairs of successive ELMs is linked to the time-evolving phase of the full flux loop signals. Each ELM produces a clear early pulse in the full flux loop signals, whose peak time is used to condition our analysis. The arrival time of the following ELM, relative to this pulse, is found to fall into one of two categories: (i) prompt ELMs, which are directly paced by the initial response seen in the flux loop signals; and (ii) all other ELMs, which occur after the initial response of the full flux loop signals has decayed in amplitude. The times at which ELMs in category (ii) occur, relative to the first ELM of the pair, are clustered at times when the instantaneous phase of the full flux loop signal is close to its value at the time of the first ELM

Magnetic moment of 43m^{43m}S

Expérience GANILInternational audienceThe gyromagnetic factor of the isomeric state of 43S has been measured using the Time Dependent Perturbed Angular Distribution (TDPAD) technique. The isomer was produced and spin aligned via the fragmentation of a 60 AMeV 48Ca beam at the GANIL facility. The deduced magnetic moment confirms the 7/2− spin/parity of the isomeric state and shows, for the first time, the intruder nature of the ground state. Comparison of the experimental values with Shell Model and mean-field based calculations were performed revealing a pronounced ground state deformation and a quasi-spherical isomeric state. A new isomeric state has been observed in the 42P

A incidência de cirurgias na população de Ribeirão Preto, SP, Brasil Incidence of surgery in Ribeirão Preto, SP, Brazil

Foi estudada a incidência de cirurgias na população residente em Ribeirão Preto, São Paulo (Brasil), em 1975, em relação à idade, sexo, categoria de internação do paciente e tipo de internação cirúrgica, utilizando-se as informações coletadas por um Centro de Processamento de Dados Hospitalares. Foram observadas elevadas taxas de cirurgias: 79,8/1000 no sexo feminino e 43,8/1000 no masculino. As intervenções obstétricas representaram 31,8% do total de operações realizadas; no sexo masculino as intervenções ortopédicas foram as de maior incidência. A proporção de internações com ocorrência de cirurgia foi mais elevada nos pacientes particulares. As operações ortopédicas e plásticas incidiram relativamente mais nos beneciários da Previdência Social e nos indigentes, enquanto que as otorrinológicas e urológicas foram proporcionalmente mais freqüentes nos pacientes particulares.<br>This paper reports on surgical rates as related to patient's ages sex and categories of hospitalization in the population of Ribeirão Preto, S. Paulo, Brazil. Data were obtained from a hospital information center. The surgical rate in Ribeirão Preto was similar to the highest rates reported in literature. Obstetric surgery accounted for 31.8% of all operations performed. Orthopedic operations were the most frequent kind of surgery performed on the male sex. Hospitalization with surgery was more frequent in the patients whose care was remunerated. The number of orthopedic and plastic surgical operations was greater in the case of Social Insurance and indigent patients, whereas otorrinological and urinary tract operations were more frequent in the case of paying patients

First isomeric quadrupole moment measured in fragmentation reactions: The case of 61 Fem 9/2+

This paper demonstrates the feasibility of quadrupole moment measurements on isomeric levels populated in projectile fragmentation reactions. The neutron-rich 61Fe(9/2+) [E*= 861 keV, T1/2= 239(5) ns] isomer was produced and spin aligned by the intermediate energy fragmentation of a 64Ni beam and implanted in a Cd single crystal. Its spectroscopic quadrupole moment |Qs|=41(6) e fm2 agrees with mean-field based calculations using the finite-range Gogny force, suggesting a moderately deformed shape characterized by an intrinsic charge quadrupole moment Q0=-85 e fm2 or Q0=+115 e fm2. The present measurement paves the way for future determinations of isomeric quadrupole moments in more exotic nuclei

Measurement of the polarisation of a high energy muon beam

Adeva B, Ahmad S, Arvidson A, et al. Measurement of the polarisation of a high energy muon beam. Nucl.Instrum.Meth. A. 1994;343(2-3):363-373

Combined analysis of world data on nucleon spin structure functions

Adeva B, Ahmad S, Arvidson A, et al. Combined analysis of world data on nucleon spin structure functions. Phys.Lett. B. 1994;320(3-4):400-406