Recent Investigations of X Rays

Recent Applications of X Rays in Condensed Matter Physics

ince their discovery by Wilhelm Conrad Rontgen, x rays «Jhave played a significant role in our lives: they make the unseen in our bodies visible; they enhance our security in air travel; they make possible nondestructive testing of a wide variety of materials. And through x-ray diffraction and spectroscopy they make it possible to probe the order of matter at the atomic level. The discovery of ...

Recent progress of avalanche photodiodes in high-resolution X-rays and γ-rays detection

We have studied the performance of large area avalanche photodiodes (APDs) recently developed by Hamamatsu Photonics K.K, in high-resolution X-rays and γrays detections. We show that reach-through APD can be an excellent soft X-ray detector operating at room temperature or moderately cooled environment. We obtain the best energy resolution ever achieved with APDs, 6.4 % for 5.9 keV X-rays, and ...

Subject headings: galaxies: general—galaxies: spiral—X-rays: general—X-rays: galaxies—X-rays: ISM

We present results from the analysis of deep ROSAT HRI and PSPC observations of the spiral galaxy M81. The inferred total (0.5–2 keV band) luminosity of M81 is ∼ 3×10 ergs s, excluding the contribution from identified interlopers found within the D25 ellipse. The nucleus of the galaxy alone accounts for about 65% of this luminosity. The rest is due to 26 other X-ray sources (contributing ∼ 10%)...

Diffraction of X-rays

Recent Investigations Nematodes

Three experiments on the control of nematodes in sugarcane fields are described and res+ults based on yield responses and nematode numbers are quoted. Meloidogyne practically disappeared when the grass, Erugrostis curvula was grown for three seasons, but increased when tomatoes and beans were groyn. Yield responses to nematocides in the absence of Meloidogyne show that this is not the only nema...