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[en] Breast cancer is the most common tumor in women, with increasing incidence worldwide. The dissection axillary lymph node is a reason for increased morbidity of breast surgery and have been replaced by sentinel node biopsy. The quality and performance of the detector probe affect the success of sentinel node surgery. The main objective of this work is to develop a set of practical tests to evaluate the performance of a probe for detecting sentinel node. (Author)
[en] The procedure of sentinel node localization is important because it allows less invasive staging of breast cancer. With the capture probe after intradermal injection of the radiopharmaceutical, the surgeon can identify the location of the sentinel node. The use of radioactive materials, generated considerable concern in terms of radiation exposure. The main objective is to evaluate the possible individual dose of each professional involved in the process of radio-location. (Author)
[en] The properties of exotic proton rich nuclei are of great importance for nuclear astrophysics models. In the present work, we show how to address many nuclear structure properties of these nuclei at the extremes of stability, from the analysis of proton radioactivity
[en] Rendezvous maneuvers are very useful in space missions operations. The encounters between spacecraft, between a spacecraft and a space debris, between a probe and a celestial body, between a spacecraft and a nearby object (NEO) as a mitigation measure to protect the Earth against collision and other applications, make use of these maneuvers. We define Quasi-Rendezvous maneuvers as those performed at low velocity, such that damage to the spacecraft is negligible. In this work, we study the distribution of these maneuvers as a function of the final relative velocities between a spacecraft and a spatial debris. The results were divided into two types: the first, for the dynamics subject only to the terrestrial gravitational force and the second, including the propulsion force acting on the vehicle. They show that the maneuvers propelled can approach the objects, overcoming the effect of the gravity of the earth for very small speeds. (paper)
[en] Two-proton radioactivity from 18Ne is discussed in terms of sequential decay. The widths for one-proton emission from excited states are calculated, which include spectroscopic factors, obtained from a Shell-model calculation with realistic interactions. The widths show that two-proton emission from the 1- state of 18Ne at 7.94 MeV, is most likely to go through sequential decay. The same mechanism is discussed for other excited states at higher energy.
[en] The role of triaxial deformation in proton emitting nuclei is studied with the nonadiabatic quasiparticle method. Exact calculations are done using this formalism which takes fully into account the pairing residual interaction and the coupling to the daughter nucleus states. Results from our calculations for the proton emitters 161Re and 185Bi are presented and the influence of triaxial deformation on the decay and structural properties of these nuclei are discussed. We predict that the half-lives for proton emission from these nuclei have a weak dependence on triaxial deformation, especially in the non-adiabatic case
[en] The nonadiabatic quasiparticle method which has been recently generalized by us to include the triaxial degree of freedom, is used to perform exact calculations for proton emission from triaxial nuclei. This formalism for triaxial proton emitters takes fully into account the pairing residual interaction and the coupling to the daughter nucleus states. With this versatile formalism, we discuss the sensitivity of our results to the triaxial deformation. We apply our method to study proton emission from the nuclei 161Re and 185Bi for which the half-lives have been measured experimentally
[en] Exact calculations are performed for proton emission from triaxial nuclei by extending the nonadiabatic quasiparticle method to include the triaxial degree of freedom. We present for the first time a proper formalism for triaxial proton emitters, which includes the treatment of the pairing residual interaction and the coupling with the excited states of the daughter nucleus. The results for the nuclei 161Re and 185Bi are discussed. In contrast to an earlier prediction, where this problem was addressed with approximate methods, a weak dependance on triaxial deformation, especially in the nonadiabatic case, is found
[en] Proton emission from deformed nuclei with triaxial symmetry is discussed within the non-adiabatic quasi-particle approach. As an example, we consider decay from 161Re, where we were able to reproduce the experimental half-life with a noticeable γ deformation.