Cross-Section Measurement of Virtual Photoproduction of Iso-Triplet Three-Body Hypernucleus, ⋀nn

Missing-mass spectroscopy with the 3H(e, e′K+) reaction was carried out at Jefferson Lab’s (JLab) Hall A in Oct–Nov, 2018. The differential cross section for the 3H(γ∗, K+)Λnn was deduced at ω = Ee − Ee′ = 2.102 GeV and at the forward K+-scattering angle (0° ≤ θγ∗K ≤ 5°) in the laboratory frame. Given typical predicted energies and decay widths, which are (BΛ, Γ) = (−0.25, 0.8) and (−0.55, 4.7) MeV, the cross sections were found to be 11.2 ± 4.8(stat.)+4.1−2.1(sys.) and 18.1 ± 6.8(stat.)+4.2−2.9(sys.) nb/sr, respectively. The obtained result would impose a constraint for interaction models particularly between Λ and neutron by comparing to theoretical calculations

Revealing the short-range structure of the "mirror nuclei" 3^3H and 3^3He

When protons and neutrons (nucleons) are bound into atomic nuclei, they are close enough together to feel significant attraction, or repulsion, from the strong, short-distance part of the nucleon-nucleon interaction. These strong interactions lead to hard collisions between nucleons, generating pairs of highly-energetic nucleons referred to as short-range correlations (SRCs). SRCs are an important but relatively poorly understood part of nuclear structure and mapping out the strength and isospin structure (neutron-proton vs proton-proton pairs) of these virtual excitations is thus critical input for modeling a range of nuclear, particle, and astrophysics measurements. Hitherto measurements used two-nucleon knockout or ``triple-coincidence'' reactions to measure the relative contribution of np- and pp-SRCs by knocking out a proton from the SRC and detecting its partner nucleon (proton or neutron). These measurementsshow that SRCs are almost exclusively np pairs, but had limited statistics and required large model-dependent final-state interaction (FSI) corrections. We report on the first measurement using inclusive scattering from the mirror nuclei $^3$H and $^3$He to extract the np/pp ratio of SRCs in the A=3 system. We obtain a measure of the np/pp SRC ratio that is an order of magnitude more precise than previous experiments, and find a dramatic deviation from the near-total np dominance observed in heavy nuclei. This result implies an unexpected structure in the high-momentum wavefunction for $^3$He and $^3$H. Understanding these results will improve our understanding of the short-range part of the N-N interaction

Pleural Effusion in Multiple Myeloma

Two patients with multiple myeloma are described in whom an unusual complication developed: pleural effusion containing myeloma cells. There are 7 previously reported cases of myeloma in the English literature with this type of effusion. Pleural effusion in myeloma may be due to plasma cell infiltration of the pleura, congestive heart failure, pulmonary embolism, nephrotic syndrome, and second neoplasms. In view of these multiple etiologies, diagnostic thoracentesis should be performed in order to treat the effusion appropriately

Wiley Post and Will Rogers with friends

Wiley Post and Will Rogers enjoy seeing Waite Phillips enjoying a moment with young Phillips Breckinridge at Phimonte, July, 26, 1925. The following month Post and Rogers lost their lives when their plane crashed on take-off near Barrow, Alaskahttps://egrove.olemiss.edu/rayburn/1060/thumbnail.jp

The Unsteady Wake of an Oscillating Cylinder at Low Reynolds Numbers

The pronounced distortion of a vortex core as it proceeds into the unstable region can be observed in Some hot-wire measurements were made in the wake of a cylinder at a Reynolds number of 220 to further investigate the unstable region of the vortex street. The vibration conditions were somewhat more extreme than those under which the flow visualization photographs were taken. The cylinder vibrated at 40 percent of a diameter and at a frequency 12 percent greater than the Strouhal frequency, for a vortex shedding parameter, St* = 0.295. Under these conditions, the formation region extended to about 1.4 dia downstream from the center of the cylinder. The mean velocity profiles recorded at four downstream positions are plotted in Conclusions The initiation of the unstable region of a vortex street wake has been studied at a Reynolds number of 220. The formation and stable regions that precede the unstable portion of the wake were stabilized by vibrating both smooth cylinders and stranded cables at frequencies near the Strouhal frequency of shedding for a stationary cylinder. These vibrations result in an essentially two-dimensional wake in the formation and stable regions, and suppress the initiation of instability. The stable and unstable regions of the vortex street have been observed at Reynolds numbers to 350 behind vibrating cylinders whereas they have been known to occur only at Reynolds numbers up to 120-150 behind a stationary cylinder. The results of both hot-wire measurements and flow visualization with injected aerosol tracers have shown that the initiation of the unstable region of the vortex wake is characterized by vortex elongation and distortion. These phenomena are accompanied by the reappearance of a substantial mean velocity deficit and an appreciable drop in velocity fluctuations. The author wishes to acknowledge the continuing support of the Naval Research Laboratory for the research program that resulted in this paper. The author is greatly indebted to his colleague, C, W. Votaw, with whom he worked during the flow visualization studies mentioned here

Relationships between left ventricular asynchrony and myocardial blood flow

OBJECTIVE: 82Rb PET protocols enable determination of left ventricular asynchrony (LVAS) at rest and stress, along with myocardial blood flow (MBF). We hypothesized that in patients with resting LVAS, MBF differs between those with stress-induced LVAS improvement and those with stress-induced LVAS deterioration. METHODS: We retrospectively analyzed 82Rb rest/regadenoson stress PET studies of 195 patients evaluated for known or suspected coronary artery disease. MBF was computed from first-pass data; function and relative perfusion were computed from myocardial equilibrium data. LVAS was defined as phase contraction bandwidth (BW) above 82Rb gender-specific normal limits, with changes defined as BW moving into or out of normal ranges. RESULTS: Among the 195 patients, 64 had LVAS at rest, of whom 13 reverted to normal and 51 continued to have LVAS with stress. Patients who did not improve had lower stress MBF (1.04 +/- 0.69 vs 1.58 +/- 0.67, p = .02) and coronary flow reserve (1.94 +/- 1.16 vs 3.04 +/- 1.22, p = .01) than those who did improve. ROC analysis indicated that the parameter most strongly associated with improvement in asynchrony for patients with resting LVAS was reduction in MBF heterogeneity (ROC area (accuracy) = 84%, sensitivity = 92%, and specificity = 67%). CONCLUSION: LVAS is highly correlated with MBF and CVR, with stress-induced improvement in synchronicity most strongly associated with improved MBF homogeneity

Relationship of\u3csup\u3e82\u3c/sup\u3eRb PET territorial myocardial asynchrony to arterial stenosis

© 2018 American Society of Nuclear Cardiology Objective:82Rb PET/CT rest/regadenoson-stress data enable quantification of left ventricular rest and stress function, perfusion, and asynchrony. Our study was conducted to determine which parameters best identify patients with multi-vessel disease (MVD) and individual stenosed arteries. Methods: PET/CT data were reviewed retrospectively for 105 patients referred for evaluation of CAD, who also underwent angiography. % arterial stenosis was determined quantitatively at a core laboratory. Severe stenosis was defined as ≥ 70%, and MVD as 2 or more stenosed arteries. Segmental MBF was calculated from first-pass data for arterial territories. Regional rest and stress systolic and diastolic asynchrony (Asynch) scores were determined from visual examination of phase polar maps. Results: 65 vessels had stenoses ≥ 70%. 15 patients had MVD. ROC area under curve (ROC AUC) for identifying patients with MVD was 83% for Asynch and 73% for MFR. ROC AUC for identifying individual arterial territories with stenoses ≥ 70% was 81% and 72% for Asynch and MFR. Conclusion:82Rb PET/CT accurately identified patients with MVD and individual stenosed territories, with regional asynchrony measurements contributing significantly to identify patients with CAD