Novel technique to extract experimental symmetry free energy information of nuclear matter

A new method of accessing information on the symmetry free energy from yields of fragments produced in Fermi-energy heavy-ion collisions is proposed. Furthermore, by means of quantum fluctuation analysis techniques, correlations between extracted symmetry free-energy coefficients with temperature and density were studied. The obtained results are consistent with those of commonly used isoscaling techniques.Comment: 6 pages, 3 figures Heavy-ion nuclear reactions at Fermi energies, Nuclear equation of State, Fragmentatio

Experimental determination of the quasi-projectile mass with measured neutrons

The investigation of the isospin dependence of multifragmentation reactions relies on precise reconstruction of the fragmenting source. The criteria used to assign free emitted neutrons, detected with the TAMU Neutron Ball, to the quasi-projectile source are investigated in the framework of two different simulation codes. Overall and source-specific detection efficiencies for multifragmentation events are found to be model independent. The equivalence of the two different methods used to assign experimentally detected charged particles and neutrons to the emitting source is shown. The method used experimentally to determine quasi-projectile emitted free neutron multiplicity is found to be reasonably accurate and sufficiently precise as to allow for the study of well-defined quasi-projectile sources.Comment: 10 pages, 8 figures. To be submitted to Nucl. Instr. and Meth.

Gênero, sexualidade e saúde reprodutiva: a constituição de um novo campo na Saúde Coletiva

S198S19

Studying correlations in 40Ar + 58Fe with FAUST

The recent detector upgrade of the Forward Array Using Silicon Technology (FAUST) is discussed along with novel implementation of energy, position and particle identification (PID) calibrations which solve challenges introduced by the position-sensitive nature of the new silicon detectors. A slight positiondependence of the energy deposited in the silicon detectors can be accounted for by using corrections derived from a 228Th source calibration. The position will be calibrated by using α particles from a point-like source at the target position through a tungsten mask of precision-cut stripes, which was positioned on the front-plate of the FAUST array. The PID can be calibrated with equations based on the energies deposited in silicon and CsI detectors, which can be verified with the proton-alpha calibration beam used in the experiment. The status and prospects for these calibrations are discussed. Calibration runs and data from the 40Ar+ 58Fe reaction are shown

Asymmetry Dependence of the Nuclear Caloric Curve

A basic feature of the nuclear equation of state is not yet understood: the dependence of the nuclear caloric curve on the neutron-proton asymmetry. Predictions of theoretical models differ on the magnitude and even the sign of this dependence. In this work, the nuclear caloric curve is examined for fully reconstructed quasi-projectiles around mass A=50. The caloric curve extracted with the momentum quadrupole fluctuation thermometer shows that the temperature varies linearly with quasi-projectile asymmetry (N-Z)/A. An increase in asymmetry of 0.15 units corresponds to a decrease in temperature on the order of 1 MeV. These results also highlight the importance of a full quasi-projectile reconstruction in the study of thermodynamic properties of hot nuclei

Prevención del fracaso académico universitario mediante tutoría entre iguales

El propósito de esta investigación fue determinar el impacto de un programa de tutoría entre iguales para prevenir el fracaso académico en la Universidad. La muestra estuvo compuesta por alumnado de nuevo ingreso de las titulaciones de Ingeniería de Caminos, Canales y Puertos, Licenciatura de Farmacia, Licenciatura en Economía e Ingeniería Química de la Universidad de Granada (N = 100). Tras elaborar y seleccionar los instrumentos necesarios que recopilaran la información demográfica y académica pertinente en la muestra seleccionada, y asignar aleatoriamente el alumnado a la condición experimental o control, la intervención consistió en una serie de sesiones de tutoría altamente estructuradas con alumnado de nuevo ingreso, por parte de alumnado de últimos cursos y/o doctorado previamente entrenados para ello. Los resultados procedentes de los análisis paramétricos y no paramétricos pertinentes realizados muestran diferencias estadísticamente significativas en estrategias de aprendizaje en el grupo experimental, y también tamaño del efecto favorable al grupo experimental en la calificación media por crédito matriculado, tasa de rendimiento y tasa de éxito al finalizar la intervención, así como en el computo total del curso académico, incluida la tasa abandono. Esta intervención ha conseguido incrementar el rendimiento académico de los participantes y mejorar la calidad de sus procesos de aprendizaje, contribuyendo a mejorar la eficacia, eficiencia y utilidad de la Educación Superior en las titulaciones intervenidas