UCx_x target design for the SPIRAL 2 project and the ALTO project

ACC NESTERInternational audienceTwo ways of production of radioactive beams using uranium carbide targets are taken into consideration: fission induced by fast neutrons and by bremsstrahlung radiation. For the SPIRAL 2 project, the fission of 238U in uranium carbide target will be induced by a neutron flow created by bombarding a carbon converter with a 40 MeV high intensity deuteron beam. Calculations and design of the target in order to reach 1013 fissions/s with good release time have been done. The second way is the photofission using an electron beam. In 2005 the ALTO project (Accélérateur Linéaire Auprès du Tandem d'Orsay) will give a 50 MeV/10$\mu$A electron beam. This facility will allow more than 1011 fissions/s. In this case, the electron beam hits the target without converter. Calculations realised in order to estimate the production are used to choose the best target shape. For the two cases some R & D on targets to improve release is described

g-factors in the ground state and in the γ\gamma-bands in 160,162,164^{160,162,164}Dy

The g-factors of some members of the ground state band and of the $2^{+}$ state in the $\gamma$-vibrational band have been measured in $^{160,162,164}$Dy using the Coulomb Excitation Transient Field technique, induced by $^{58}$Ni projectiles at 230, 210 and 217 MeV, respectively. The g-factors in the ground state band are consistent with a constant value, while that of the $2^+_\gamma$ states is about 20% larger in average than those in the ground state band. Results are discussed in the frame of the systematics in this nuclear region

Isomers in neutron-rich lead isotopes populated via the fragmentation of 238U at 1 GeV A

Neutron-rich nuclei beyond N = 126 in the lead region were populated by fragmenting a238U beam at 1 GeV A on a Be target and then separated by the Fragment Separator (FRS) at GSI. Their isomeric decays were observed, enabling study of the shell structur

Variação sazonal do enraizamento de estacas de cultivares de Vitis rotundifolia Seasonal variation of rooting on stem cuttings of Vitis rotundifolia cultivars

Este trabalho objetivou avaliar o enraizamento de 9 cultivares de Vitis rotundifolia nas quatro épocas do ano (verão, outono, inverno e primavera). As cultivares estudadas foram as seguintes: Topsail, Magnolia, Creek, Noble, Roanoke, Magoon, Regale, Bontiful e Dixie, sendo a estaquia realizada em câmara de nebulização intermitente, com o intervalo de rega controlado de acordo com a época do ano. O delineamento utilizado foi o inteiramente casualizado, com quatro repetições, nove tratamentos e 15 estacas por parcela. Todos os experimentos foram avaliados após 75 dias, levando-se em consideração as seguintes variáveis: porcentagem de estacas com folha e porcentagem de estacas enraizadas por parcela; número de raízes; comprimento (cm) das raízes principais e massa seca das raízes por estaca (mg). Nas estacas lenhosas, retiradas no outono e no inverno, não se obteve enraizamento. Com as estacas semilenhosas, retiradas no verão e na primavera, ocorreu enraizamento em todas as cultivares, com destaque para as cultivares Magnolia e Noble na primavera, que apresentaram 61,66% e 51,66% de enraizamento, respectivamente. Nessa época, também ocorreu maior retenção foliar. A cultivar Bontiful demonstrou grande dificuldade de enraizamento. Para a propagação de cultivares de V. rotundifolia, recomenda-se a estaquia semilenhosa durante a primavera.<br>The objective of this work was to evaluate the rooting on cuttings of nine Vitis rotundifolia cultivars during the seasons of the year (summer, autumn, winter and spring). The evaluated cultivars were: Topsail, Magnolia, Creek, Noble, Roanoke, Magoon, Regale, Bontiful e Dixie. The experiment was carried out under intermittent mist chamber, with irrigation controled according with the season of the year. The experimental design was in randomized blocks with nine treatments, each one with 4 replicates containing 15 stem cuttings. All experiments were evaluated after 75 days after planting and the following variables were determined: percentage of cuttings with leaf and percentage of rooted cutting per plot; number of roots, length (cm) of main roots and dried mass of roots per cuttings. No roots developed on lignified cutings collected from plants during fall and winter. Cuttings collected from all cultivars during the summer and spring, were succesfully rooted, being superior on Magnolia and Noble cultivars during the spring, that showed 61.66% and 51.66% of rooting rate, respectively. This season also showed great leaf retention. The lowest percentage or rooting was observed for stem cuttings of the cultivar Bontiful. The resulst finally showed that spring is the best season for rooting of V. rotundifolia stem cuttings

Exploring the potential of the São Paulo Potential

Recent development of an imaginary potential based on the São Paulo potential is briefly presented. Further developments of the model in order to describe weakly bound systems (e.g. 7Li +120Sn) are discussed and compared to experimental data. New preliminary data on the 18O+110Pd transitional system are also presented and apparent similarities to the weakly bound case are commented

Exploring the potential of the São Paulo Potential

Recent development of an imaginary potential based on the São Paulo potential is briefly presented. Further developments of the model in order to describe weakly bound systems (e.g. 7Li +120Sn) are discussed and compared to experimental data. New preliminary data on the 18O+110Pd transitional system are also presented and apparent similarities to the weakly bound case are commented