Detection of low energy antimatter with emulsions

Emulsion detectors feature a very high position resolution and consequently represent an ideal device when particle detection is required at the micrometric scale. This is the case of quantum interferometry studies with antimatter, where micrometric fringes have to be measured. In this framework, we designed and realized a new emulsion based detector characterized by a gel enriched in terms of silver bromide crystal contents poured on a glass plate. We tested the sensitivity of such a detector to low energy positrons in the range 10–20 keV . The obtained results prove that nuclear emulsions are highly efficient at detecting positrons at these energies. This achievement paves the way to perform matter-wave interferometry with positrons using this technology.

(Table 1) Organohalogen contaminants in adipose tissue of captive sledge dogs (Canis familiaris) fed with whale blubber or pork fat

Studies on the fate of organohalogen contaminants (OHCs) in wild top predator mammals in the Arctic have often been a challenge due to important knowledge deficiencies in the life history of the sampled animals. The present study investigated the influence of age, dietary and trans-generational factors on the fate of major lipophilic chlorinated and brominated OHCs in adipose tissue of a potential surrogate captive species for the polar bear (Ursus maritimus), the sledge dog (Canis familiaris) in West Greenland. Adult female sledge dogs (P) and their sexually-mature (F1) and/or pre-weaning pups (F1-MLK) were divided into an exposed group (EXP) fed blubber from a Greenland minke whale (Balaenoptera acutorostrata) and a control group (CON) given commercially available pork fat. Large dietary treatment-related differences in summed and individual congener/compound adipose tissue concentrations of polybrominated diphenyl ethers (PBDEs), hexachlorobenzene (HCB), chlordanes (CHLs) and polychlorinated biphenyls (PCBs) were found between the EXP and CON groups for all the sledge dog cohorts. However, among the F1-MLK, F1 and P dogs in both of the EXP and CON groups, little or no difference existed in PBDE, HCB, CHL and PCB concentrations, suggesting higher state of equilibrium in adipose tissue concentrations from a very early stage of life. In contrast, the distribution pattern (proportions to the summed concentrations) of OHC classes, and the major congeners/ compounds constituting those classes, varied on a dietary group- and/or cohort-dependent manner. The present captive sledge dog study demonstrated the importance of the confounding effects of diet composition, mother-pup association (maternal transfer), reproductive status (nursing), and to a lesser extent age in the fate of OHCs in adipose tissue of a large top carnivore mammal.

Kitāb Nuzhat dhawī al-kays wa-tuḥfat al-udabāʼ fī qaṣāʼid Imruʼ al-Qays ashʻar al-shuʻarāʼ.

Added t.p.: Le diwan d'Amroʼlkaïs,prʹecʹdʹe de la vie de ce poète par l'auteur du Kitab el-aghani accompagnʹe d'une traduction et de notes par Le Bon. Mac Guckin de Slane.

Alpha particles from fission as recorded by photographic emulsions /

Work performed at the Argonne National Laboratory.

Testing for fat in milk by the Babcock test /

Cover title.

Identification of particles recorded by nuclear emulsions by the method of mulptiple scattering /

"October 15, 1951."

Weight reduction in college women using a moderate-fat diet.

Special problem (M. N. S.)--Cornell Univ., June 1953.

General-contact weed killers : water soluble chemicals, oils & fortified oils, emulsions /

Mode of access: Internet.

Carotin, the principal natural yellow pignment of milk fat.

Bibliography: p. 334-336.

Too fat to fight ...

Bound in maroon paper boards; stamped in cream & red.

Absorption of fat in various nutritional states; a bibliography and review of the literature,

Processed.