No abstract

The K-p reactions leading to charge exchange and hyperon final states have been studied at nine momenta between 862 and 1001 MeV Ic using data from a 600,000 picture exposure of the Lawrence Berkeley Laboratory 25" liquid hydrogen bubble chamber. Partial cross sections are determined for all final states resolved by kinematic fitting. In addition, differential cros s sections are presented for the two-body final states ROn, AlTo and ~±1T=f along with hyperon polarization angular distributions for i\ 1T ° and~+ 1T-•

Abstract.-iii - VIT.-iv- III -i. III-2.III-3.IV-1.. IV-2.IV-3.IV-4.IV-5.IV-6.IV-7.IV-8.V-1.V-2. VI-7.VI-8.VI-9.VII-1. VII-Z.VII-3.B-1. B-Z.B-3. 3-4.B-5.B-6. B-7.C-1.E-4.E-5.E-6.

Phys. Rev. 130, 1568. 6 It is known that T. D. Lee and C. N. Yang [Phys. Rev. 108, 1645 (1957)] and J. Cronin and O. Overseth (Ref. 22) have an inconsistency in the definition of 0; their definitions of & from the decay amplitudes and the condition imposed by time-reversal invariance should be read with an opposite sign.The production of cascade hyperons by incident K~ on hydrogen has been studied from threshold (1.05 BeV/c) to 1.7 BeV/c. A sample of 1004 E~ and 206 S° was obtained. Production cross sections rise over this momentum range, reaching about 150 fxb for E~£ + production and about 100 /*b each for &PK 0 and STTK. Production of the E*(1530) near threshold is observed, and the assignment I=\ for this resonance is confirmed. The S decay analysis yields weak evidence for /g = |. For J% -\, our decay-parameter results are Ae~f>)/(E~" ->Ax"), was found to be 0.5%.

No abstract

A number of researchers have noted that the black population in the United States generally has less favorable cancer survival than does the white population. It is not clear, however, whether this difference is fully explained by differences in stage of disease at diagnosis. This study uses Surveillance, Epidemiology, and End Results program data from the San Francisco-Oakland (California) Metropolitan Statistical Area for the years 1974-1985 to study survival differences between blacks and whites while controlling for both stage and age at diagnosis. The cancer sites examined are those for which mortality is considered avoidable by early detection and treatment, namely the colon, rectum, bladder, breast, cervix, uterine corpus, and prostate. Stage-specific (local, regional, and remote) survival curves are examined for each cancer site. The site- and stage-specific curves for colon, male rectal, and prostate cancer, supplemented by proportional hazards analyses, indicate no significant stage-specific racial differentials. Stage-specific survival differentials persist for male bladder, female rectal, and breast cancer. The relation between race and stage is more complex for female bladder, cervical, and uterine corpus cancer; for these sites, there is a racial difference at some stages but not all. The consequences for secondary intervention programs are considered for the seven sites in light of these findings.

No abstract

Cases plotted on a geopolitical map entail difficulties in interpretation and analysis because of variable population density in the study area. Density equalized map projections (DEMPs) eliminate the distribution of the resident population as an interfering influence by transforming map area to be proportional to population. This paper discusses a transformation algorithm, its properties, and develops statistical methods to detect clustering of cases around a fixed point for data plotted on DEMPs. We suggest two numeric methods where exact solutions are too complicated or do not exist. Finally, we illustrate these methods using data from Denver and Jefferson counties in Colorado to investigate whether lung cancer and leukaemia incidence patterns are associated with plutonium exposure from the Rocky Flats plant site.