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Research Interests: Physics, Atomic Physics, Time Use, Nuclear Fusion, Coulomb, and 3 moreExcited states, Gamma Ray, and Nucleus
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Introducción Son muchos los estudios ambientales que requieren de la medida de radionúclidos naturales como 210Pb, 226Ra, 228Th, 230Th, 232Th, 235U y 238U. Por formar parte del fondo natural, todos ellos contribuyen a la dosis a la que la... more
Introducción Son muchos los estudios ambientales que requieren de la medida de radionúclidos naturales como 210Pb, 226Ra, 228Th, 230Th, 232Th, 235U y 238U. Por formar parte del fondo natural, todos ellos contribuyen a la dosis a la que la población está expuesta1, por lo tanto, una alteración de las concentraciones en las que se encuentran en la naturaleza debe ser vigilada. Los cambios en la distribución de estos radionúclidos pueden producirse tanto en la industria nuclear, sobre todo en actividades mineras y de preconcentración del uranio2, ...
The γ decay from the high-lying states of ^140Ce excited via inelastic scattering of ^17O at a bombarding energy of 340 MeV was measured using the high-resolution AGATA-demonstrator array in coincidence with scattered ions detected in two... more
The γ decay from the high-lying states of ^140Ce excited via inelastic scattering of ^17O at a bombarding energy of 340 MeV was measured using the high-resolution AGATA-demonstrator array in coincidence with scattered ions detected in two segmented Δ E-E silicon detectors. Angular distributions of scattered ions and emitted γ rays were measured, as well as their differential cross sections. The excitation of 1^− states below the neutron separation energy is similar to the one obtained in reactions with the α isoscalar probe. The comparison between the experimental differential cross sections and the corresponding predictions using the distorted-wave Born approximation allowed us to extract the isoscalar component of identified 1^− pygmy states. For this analysis the form factor obtained by folding microscopically calculated transition densities and optical potentials was used.
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Neutron rich nuclei have been populated using the 82 Se +192 Os deep-inelastic reaction. New experimental results on 188 W , 188,190 Os target-like nuclei, as well as 74,76,78 Ge beam-like nuclei are presented.
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Research Interests: Physics, Atomic Physics, Nuclear Energy, Proton, Neutron, and 3 moreShell Model, Nucleus, and Excitation
... T. Martinez, 1 R. Menegazzo, 3 DR Napoli, 1 B. Quintana, 5 P. Spolaore, 1 YH Zhang, 1 and J. Wrzesinski 4 ... From the region NZ 40 to nuclei close to NZ 50 there is a dramatic structure evolution from strongly deformed nuclei to... more
... T. Martinez, 1 R. Menegazzo, 3 DR Napoli, 1 B. Quintana, 5 P. Spolaore, 1 YH Zhang, 1 and J. Wrzesinski 4 ... From the region NZ 40 to nuclei close to NZ 50 there is a dramatic structure evolution from strongly deformed nuclei to spherical (shell model) ones, challenging the ...
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... PMK I is the angular mo-mentum projector 25 which projects good angular momen-tum from an intrinsic state . In this way, angular mo-mentum conservation, which is violated in the deformed mean-field calculation, is restored. ...
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This contribution reports on the results of an experiment to study the near‐yrast states in selenium‐and osmium‐like nuclei, following their population in thick‐target, multinucleon transfer reactions between an Se beam and a Os target.... more
This contribution reports on the results of an experiment to study the near‐yrast states in selenium‐and osmium‐like nuclei, following their population in thick‐target, multinucleon transfer reactions between an Se beam and a Os target. The experimental results for the ...
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<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mn>1</mn><mo>−</mo><
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Yrast states in neutron rich nuclei 188 Os and 190 Os have been populated using the deep-inelastic reaction 82 Se + 192 Os at 460 MeV beam bombarding energy. A thick 192 Os target (>50 mg/cm 2) with 0.2 mm Ta backing was used to stop... more
Yrast states in neutron rich nuclei 188 Os and 190 Os have been populated using the deep-inelastic reaction 82 Se + 192 Os at 460 MeV beam bombarding energy. A thick 192 Os target (>50 mg/cm 2) with 0.2 mm Ta backing was used to stop all of the recoils in the target, minimising the broadening of the lines due to Doppler shift. High fold γ-γ coincidences were aquired with the 4π spectrometer GASP detector array. Three and two dimensional gamma-ray matrices were used to construct level schemes of the nuclei of interest up to an yrast state of 22.
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Research Interests: Engineering and Physics
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Shape evolution in the neutron-rich osmium isotopes: Prompt <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>γ</mi><mtext>-ray</mtex
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The coupling of big Ge-arrays like EUROBALL or GASP with ancillary detectors for the study of the structure properties of very exotic nuclei, far from the stability valley, has given outstanding results in the last years. A large fraction... more
The coupling of big Ge-arrays like EUROBALL or GASP with ancillary detectors for the study of the structure properties of very exotic nuclei, far from the stability valley, has given outstanding results in the last years. A large fraction of the experiments performed with both arrays has been devoted to study both proton-rich and neutron-rich nuclei populated using stable beams provided by the LNL Legnaro and MeS Strasbourg accelerators. Nuclei lying close to the N = Z line are of particular interest being a laboratory where collective excitations as well as fundamental properties of the nuclear force can be tested, like isospin symmetry and isospin breaking terms, proton neutron pairing, dripline effects and coherent neutron and proton contributions to the nuclear excitations. Some of this properties are more evident (degree of isospin mixing) or can be only observed (collective effects) in heavy N = Z nuclei. In this contribution we present the experimental results obtained by our collaboration along and in the vicinity of N = Z line.
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shows the energy of the emitted gamma rays. The second presents the maximum peak efficiency that can be obtained with the setup (acting as a total absorption spectrometer). The third and fourth columns show the peak to total ra- tio... more
shows the energy of the emitted gamma rays. The second presents the maximum peak efficiency that can be obtained with the setup (acting as a total absorption spectrometer). The third and fourth columns show the peak to total ra- tio obtained in case the planar and the stack detectors are considered individually. The fifth column shows the peak to total ratio obtained after the application of the tracking code. Finally the last column presents the efficiency of the tracking code.
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ABSTRACT High-spin excited states have been identified in the N=Z+1 nucleus {sup 91}Rh with the reaction {sup 54}Fe({sup 40}Ca,p2n{gamma}) at 130 MeV, using the GASP array, the ISIS silicon array, and the n-ring detector system. Two... more
ABSTRACT High-spin excited states have been identified in the N=Z+1 nucleus {sup 91}Rh with the reaction {sup 54}Fe({sup 40}Ca,p2n{gamma}) at 130 MeV, using the GASP array, the ISIS silicon array, and the n-ring detector system. Two structures have been observed, the positive-parity yrast sequence above the (9/2{sup +}) ground state and a sequence assigned to negative parity that is built on a possible (1/2{sup -}) isomeric state. The observed structures are compared with various shell-model calculations in the (p{sub 1/2},g{sub 9/2}) space.
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Yrast transitions of the neutron deficient nucleus 93 Pd were identified in the alphan exit channel of the reaction 40 Ca + 58 Ni at 135 MeV using the gamma ray spectrometer GASP, the ISIS ball, and the n -ring detector system. The... more
Yrast transitions of the neutron deficient nucleus 93 Pd were identified in the alphan exit channel of the reaction 40 Ca + 58 Ni at 135 MeV using the gamma ray spectrometer GASP, the ISIS ball, and the n -ring detector system. The relationship of prompt gammagamma coincidences and the selection of gamma rays coincident with evaporated neutrons and alpha
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(210)Pb and (137)Cs dating methods, accompanied by a high-resolution geochemical study, were applied to intertidal sediments containing both fine and coarse-grained particles and also, anthropogenic Pb in order to establish sedimentation... more
(210)Pb and (137)Cs dating methods, accompanied by a high-resolution geochemical study, were applied to intertidal sediments containing both fine and coarse-grained particles and also, anthropogenic Pb in order to establish sedimentation rates and historical trends in heavy metal input. Sedimentation rates were established according to the &amp;amp;amp;amp;amp;amp;amp;amp;quot;Constant Flux:Constant Sedimentation&amp;amp;amp;amp;amp;amp;amp;amp;quot; (CF:CS) (210)Pb dating model, which was preferred rather than the &amp;amp;amp;amp;amp;amp;amp;amp;quot;Constant Rate of Supply-Minimum Variance&amp;amp;amp;amp;amp;amp;amp;amp;quot; (CRS-MV) model. Variations in sediment grain-size were accounted for by application of several normalization procedures. Al was selected for grain-size correction. Corrected sedimentation rates obtained from (210)Pb dating were corroborated through a second independent radionuclide tracer and by comparison of peak trace metal inputs into the environment with peaks in the sediment. The Chernobyl maximum was identified in the normalized (137)Cs activity profile. Sedimentation rates of 6.2+/-1.2 mm y(-1) and 3.1+/-0.5 mm y(-1) for the upper (two muddy layers) and 6.0+/-2.0 mm y(-1) for the lower (sandy) intertidal mud flat deposits of San Simón Bay were determined. According to the established chronology, human-induced environmental changes were detected in total metal concentrations (Cu, Pb, Zn) and in sediment grain-size and composition.