Refractive effects in the scattering of loosely bound nuclei

A study of the interaction of loosely bound nuclei 6,7Li at 9 and 19 AMeV with light targets has been undertaken. With the determination of unambiguous optical potentials in mind, elastic data for four projectile-target combinations and one neutron transfer reaction 13C(7Li,8Li)12C have been measured on a large angular range. The kinematical regime encompasses a region where the mean field (optical potential) has a marked variation with mass and energy, but turns out to be sufficiently surface transparent to allow strong refractive effects to be manifested in elastic scattering data at intermediate angles. The identified exotic feature, a "plateau" in the angular distributions at intermediate angles, is fully confirmed in four reaction channels and interpreted as a pre-rainbow oscillation resulting from the interference of the barrier and internal barrier farside scattering subamplitudes.Comment: 19 pages, 14 figures, 3 tables to submit to Phys. Rev.

Dark Energy in an Axion Model with Explicit Z(N) Symmetry Breaking

We point out that a well known axion model with an explicit Z(N) symmetry breaking term predicts both dark energy and cold dark matter. We estimate the parameters of this model which fit the observed densities of the dark components of the universe. We find that the parameters do not conflict with any observations.Comment: 5 pages, minor change

Caracterização do consumo das carnes caprina e ovina em Alagoas.

bitstream/CPATC-2010/20744/1/doc82.pd

Caracterização do consumo das carnes caprina e ovina na cidade de Salvador, BA.

bitstream/CPATC-2010/20743/1/doc81.pd

Estudio preliminar de las binarias eclipsantes RT Hydri y V594 Centauri

Se presentan las primeras observaciones fotoeléctricas UBV de dos sistemas binarios eclipsantes de corto período orbital: RT Hydri y V594 Centauri. Se determinan nuevos tiempos de mínimo y se actualizan las efemérides, incluyendo posibles variaciones del período. Las curvas de luz derivadas de las presentes observaciones exhiben las características típicas de las binarias tipo W UMa, con apreciables profundidades en los mínimos. Un análisis preliminar de las curvas en magnitud V permite clasificar a los dos sistemas estudiados dentro del gtupo de las binarias cerradas de contacto marginal.Asociación Argentina de Astronomí

The IGEX experiment revisited: a response to the critique of Klapdor-Kleingrothaus,Dietz, and Krivosheina

This paper is a response to the article "Critical View to" the IGEX neutrinoless double-beta decay experiment..."published in Phys. Rev.D, Volume 65 (2002) 092007," by H.V.Klapdor-Kleingrothaus, A. Dietz, and I.V.Krivosheina, published as preprint hep-ph/0403056. The criticisms are confronted, and the questions raised are answered. We demonstrate that the lower limit quoted by IGEX, for the half life of Ge-76 neutrinoless double beta decay, 1.57x10**25 y, is correct and that there was no "arithmetical error"-as claimed in the " Critical Review" article

CARACTERIZACIÓN DE LAS LESIONES ENCONTRADAS EN BOVINOS CON HEMATURIA VESICAL ENZOÓTICA EN LA ZONA DE OXAPAMPA, PASCO

Se realizó el estudio anátomo-histopatológico de muestras de vejiga urinaria, así como de hígado, riñón y bazo de vacunos con lesiones de una enfermedad conocida en la provincia de Oxapampa (Pasco) como “Hematuria” o “Intoxicación por Machicura”. Las muestras se obtuvieron de 41 animales con lesiones en vejiga urinaria a partir de la inspección de 173 animales en el Camal Municipal de Oxapampa. En el diagnóstico histopatológico se emplearon las tinciones de Hematoxilina-Eosina e histoquímicas de Hale para mucopolisacáridos ácidos y tricrómico de Masson para tejido conectivo fibroso y muscular con presencia de colágeno. Las lesiones halladas en la vejiga urinaria fueron multifocales en el 85.5% (35/41) de los casos, siendo las más frecuentes las formaciones nódulo-vasculares ulceradas. Las lesiones microscópicas corresponden a procesos proliferativos donde destacaron los polipoides (24/41), procesos circulatorios como los hemorrágicos (28/41) y las yemas de proliferación vascular o “nidos angioblásticos” (19/41) y procesos inflamatorios como la cistitis no supurativa (29/41). Los procesos neoplásicos se presentaron en el 68.3% (28/41), siendo el 41.7% de tipo epitelial y el 58.3% no epitelial. Los epiteliales estuvieron representados por carcinomas in situ (11/ 41) y papilomas mucosos (4/41), mientras que el hemangiosarcoma (14/41), hemangioma (10/41) y mixosarcoma (6/41) fueron los neoplasmas no epiteliales más frecuentes. Se registró un solo caso de papiloma racemoso, rabdomiosarcoma, leiomiosarcoma, hemangiopericitosarcoma, carcinoma tubular, carcinoma escamoso, linfoma y una metástasis linfoide. Se concluye que el proceso conocido como “hematuria” en Oxapampa corresponde a la hematuria vesical enzoótica bovina.An anatomo-histopathologic study of the urinary bladder, liver, kidney and spleen from 41 Zebu and crossbreed cattle with different lesions of a disease commonly named as “hematuria” or Machicura´s intoxication was carried out in the Oxapampa province (Pasco). A total of 173 animals were inspected and samples from 41 animals with pathological lesions in bladder were collected at the local slaughterhouse. It was found that urinary bladder lesions were multifocal in 85.4% (35/41) of the cases. Tissue samples were processed with Hematoxiline-Eosine stain (HE), Hale´s histochemical stain for acid mucopolysaccharide and Masson trichromic for fibrous connective tissue with collagen or muscular fibres. The most important microscopic lesions were proliferative polips (24/ 41); the circulatory processes as haemorrhage (28/41), vascular proliferation or “angioblastic nests” (19/41), and inflammatory processes as the non suppurative cystitis (29/41). Neoplasias were found in the 68.3% of the cases (28/41), where 41.7% had epithelial origen and 58.3% were of non epithelial type. The epithelial types were represented by the in situ carcinoma (11/41) and mucous papilloma (4/41), whereas the hemangiosarcoma (14/41), hemangioma (10/41) and mixosarcoma (6/41) were the most frequent non epithelial neoplasias. Single cases of racemous papilloma, squamous cell carcinoma, tubular carcinoma, rhabdomyosarcoma, leiomyosarcoma, hemangiopericytosarcoma, lymphoma, and a lymphoid metastasis were observed. It is concluded that the well known process of “hematuria” corresponded to Bovine Enzootic Hematuria