71 research outputs found
Shapes of the Pb ground states from beta decay studies using the total absorption technique
The beta decay of Pb has been studied using the total absorption
technique at the ISOLDE(CERN) facility. The beta-decay strength deduced from
the measurements, combined with QRPA theoretical calculations, allow us to
infer that the ground states of the Pb isotopes are spherical.
These results represent the first application of the shape determination method
using the total absorption technique for heavy nuclei and in a region where
there is considerable interest in nuclear shapes and shape effects
Beta decay studies of the N=Z and waiting point nucleus
The β+/EC decay of 72Kr has been studied by means of the Total Absorption gamma Spectroscopy technique in order to determine the Gamow-Teller strength B(GT) distribution. The comparison with theoretical predictions suggests a dominantly oblate deformation for the 72Kr ground state. The de-excitation of low-energy excited states in 72Br is studied via conversion electron spectroscopy. The conversion coefficients and multipolarities of 14 low-energy transitions are determined and the spin and parity of the levels involved are deduced
SimulPast: un laboratorio virtual para el análisis de las dinámicas históricas
The use of Computer Simulation for the study of Physics or Biology has its roots in the 1940s. The Social Sciences and Humanities have recently become aware of the heuristic potential computational models have for the study of social dynamics, generating the new field of Social Simulation. Specifically, from the first applications of Computer Simulation to Archaeology, their complementary nature has been proved. Computer Simulation provides an ideal context as a virtual laboratory in which to experiment with dynamic processes and Archaeology provides the possibility of generating information about past social processes, both short and long-term. However, we need to make a profound epistemological and methodological reflection about the nature of this tool and the implications of using it in Archaeology. On this basis, SimulPast aims to develop a theoretical and methodological research platform, which is both innovative and trans-disciplinary. The Project aspires to improve the study of historical, social and ecological dynamics of human societies as well as to stimulate the debate on the scientific research process at large
Magnetic moment measurement in
The g factor of the first excited 2+ state of 72Zn has been measured using the Low Velocity Transient Field (LVTF) technique in combination with Coulomb excitation in inverse kinematics. The aim of the experiment was to test the viability of this method when applied to short-lived radioactive ISOL beams, in particular in comparison to the alternative High Velocity Transient Field (HVTF) technique using fragment beams. The result obtained for g(2+) in 72Zn in the present experiment follows the trend observed for the lighter stables Zn isotopes
Fast Timing Study of the β− Decay of 63Mn to 63Fe
International audienceThe β− decay of 63Mn to 63Fe has been studied in an experiment at ISOLDE, CERN. The previously known 63Fe level scheme has been confirmed and greatly expanded, to a total of 31 levels and 73 γ lines. The energy of the 9/2+ isomer state has been measured for the first time at 475.0 keV, completing the systematics of such states in odd-Fe isotopes below 68Ni. In addition, the lifetimes of the low-lying states have been measured, allowing the tentative assignment of the spin-parity sequence for those levels
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