Timescale for equilibration of N/Z gradients in dinuclear systems

Equilibration of N/Z in binary breakup of an excited and transiently deformed projectile-like fragment (PLF*), produced in peripheral collisions of 64Zn + 27Al, 64Zn, 209Bi at E/A = 45 MeV, is examined. The composition of emitted light fragments (3<=Z<=6) changes with the decay angle of the PLF*. The most neutron-rich fragments observed are associated with a small rotation angle. A clear target dependence is observed with the largest initial N/Z correlated with the heavy, neutron-rich target. Using the rotation angle as a clock, we deduce that N/Z equilibration persists for times as long as 3-4 zs (1zs = 1 x 10^-21 s = 300 fm/c). The rate of N/Z equilibration is found to depend on the initial neutron gradient within the PLF*.Comment: 6 pages, 4 figure

Dark Sector from Interacting Canonical and Non-Canonical Scalar Fields

In this work it is investigated general models with interactions between two canonical scalar fields and between one non-canonical (tachyon-type) and one canonical scalar field. The potentials and couplings to the gravity are selected through the Noether symmetry approach. These general models are employed to describe interactions between dark energy and dark matter, with the fields being constrained by the astronomical data. The cosmological solutions of some cases are compared with the observed evolution of the late Universe.Comment: 20 pages, 13 figures, correction of misprints in eqs. (4), (5), (43), (44

Kondo behavior, ferromagnetic correlations, and crystal fields in the heavy Fermion compounds Ce3X (X=In, Sn)

We report measurements of inelastic neutron scattering, magnetic susceptibility, magnetization, and the magnetic field dependence of the specific heat for the heavy Fermion compounds Ce$_3$In and Ce$_3$Sn. The neutron scattering results show that the excited crystal field levels have energies $E_1$ = 13.2 meV, $E_2$ = 44.8 meV for Ce$_3$In and $E_1$ = 18.5 meV, $E_2$ = 36.1 meV for Ce$_3$Sn. The Kondo temperature deduced from the quasielastic linewidth is 17 K for Ce$_3$In and 40 K for Ce$_3$Sn. The low temperature behavior of the specific heat, magnetization, and susceptibility can not be well-described by J=1/2 Kondo physics alone, but require calculations that include contributions from the Kondo effect, broadened crystal fields, and ferromagnetic correlations, all of which are known to be important in these compounds. We find that in Ce$_3$In the ferromagnetic fluctuation makes a 10-15 % contribution to the ground state doublet entropy and magnetization. The large specific heat coefficient $\gamma$ in this heavy fermion system thus arises more from the ferromagnetic correlations than from the Kondo behavior.Comment: 8 pages, 6 figure

Avaliação da massa corporal e do índice articular clínico em caprinos portadores do vírus da Artrite-Encefalite Caprina (CAEV).

A Artrite Encefalite Caprina (CAE) é uma doença que acomete caprinos principalmente na forma artrítica e progride de forma lenta e gradual com o aparecimento de sintomas de inchaço, dor e dificuldades de locomoção. Desta forma, objetivou-se verificar a evolução do grau de artrite na região do carpo/metacarpo e a perda de peso vivo em animais inoculados com o Vírus da Artrite Encefalite Caprina (CAEV). Foram utilizados dez reprodutores adultos, mantidos em um sistema semi-intensivo de criação. Os animais foram divididos em dois grupos: o Grupo A (GA) foi inoculado com o vírus (CAEV-Cork, 106 TCID 50 /ml) e o grupo B (GB) permaneceu livre do CAEV. Após a inoculação os animais foram submetidos a teste de imunodifusão em gel de Agarose (IDGA) até a soroconversão que ocorreu com 106 dias pós-inoculação. Após a soroconversão foi mensurado mensalmente o índice articular clínico (IAC) e registrado o peso vivo dos animais durante o período de 21 meses. Os dados foram expressos em forma de média e analisados pelo teste Tukey a 5% de significância. Observou-se que os animais uma vez soroconvertidos tendem a aumentar gradativamente o IAC havendo diferença (p0,05) entre os grupos em relação ao peso vivo

Controle da artrite encefalite caprina através do uso de tecnologias reprodutivas aplicadas às fêmeas.

[ALICE ANDRIOLI PINHEIRO]bitstream/CNPC/20872/1/cot86.pd