P. Amador-Valenzuela
A5060543826- Nuclear physics research studies
- Nuclear Physics and Applications
- Neutrino Physics Research
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Advanced NMR Techniques and Applications
- Nuclear reactor physics and engineering
- Particle accelerators and beam dynamics
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Radiation Detection and Scintillator Technologies
- Rare-earth and actinide compounds
- Radioactive element chemistry and processing
- Superconducting Materials and Applications
- Advanced Chemical Physics Studies
- Medical Imaging Techniques and Applications
- Magnetic confinement fusion research
- Radiation Therapy and Dosimetry
- Cold Fusion and Nuclear Reactions
- Astro and Planetary Science
- Wireless Sensor Networks for Data Analysis
- Muon and positron interactions and applications
- Spacecraft and Cryogenic Technologies
Instituto Nacional de Investigaciones Nucleares
2015-2024
Universidad Nacional Autónoma de México
2022-2023
Joint Institute for Nuclear Astrophysics
2020
University of Notre Dame
2020
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud
2019
Universidad Autónoma del Estado de México
2011-2014
Fusion cross sections were measured for the exotic proton-halo nucleus ⁸B incident on a ⁵⁸Ni target at several energies near Coulomb barrier. This is first experiment to report fusion of nucleus. The resulting excitation function shows striking enhancement with respect expectations normal projectiles. Evidence presented that sum and breakup yields saturates total reaction section.
Carbon and oxygen burning reactions, in particular, $^{12}$C+$^{12}$C fusion, are important for the understanding interpretation of late phases stellar evolution as well ignition nucleosynthesis cataclysmic binary systems such type Ia supernovae x-ray superbursts. A new measurement this reaction has been performed at University Notre Dame using particle-$\gamma$ coincidence techniques with SAND (a silicon detector array) high-intensity 5U Pelletron accelerator. New results fusion low...
Background: Single-charge-exchange reactions are appropriate tools to study the nuclear response one-particle/one-hole isospin probes, gaining additional interest from connection beta decay. This analogy has been recently extended second order, connecting double-charge-exchange and double decays. Nowadays, availability of powerful experimental setups advanced theories models allows one access precious information on key structure aspects embedded in widely sought neutrinoless decay.Purpose:...
Background: A systematic exploration of one-nucleon transfer reactions induced by the ($^{18}\mathrm{O},^{19}\mathrm{F}$) and ($^{18}\mathrm{O},^{17}\mathrm{O}$) on different targets ($^{12}\mathrm{C}, ^{16}\mathrm{O}, ^{27}\mathrm{Al}, ^{40}\mathrm{Ca}, ^{48}\mathrm{Ti}, ^{76}\mathrm{Se}, ^{116}\mathrm{Sn}$) is being performed at Istituto Nazionale di Fisica Nucleare--Laboratori Nazionali del Sud (INFN-LNS) beam energies higher than Coulomb barrier. featured aspect adoption a multichannel...
The 40 Ca( 18 O, F) K single charge exchange (SCE) reaction is explored at an incident energy of 275 MeV and analyzed consistently by collecting the elastic scattering inelastic data under same experimental conditions. Full quantum-mechanical SCE calculations direct mechanism are performed including microscopic nuclear structure inputs adopting either a bare optical potential or coupled channel equivalent polarization (CCEP) constrained data. describes magnitude shape angular distributions...
Double charge exchange (DCE) reactions could provide experimentally driven information about nuclear matrix elements of interest in the context neutrinoless double-β decay. To achieve this goal, a detailed description reaction mechanism is mandatory. This requires full characterization initial and final-state interactions, which are poorly known for many projectile-target systems involved future DCE studies. Among these, we intend to study 20Ne + 130Te 18O 116Sn at 15.3 AMeV, particularly...
NUMEN proposes an innovative technique to access the nuclear matrix elements entering expression of lifetime double beta decay by cross-section measurements heavy-ion induced Double Charge Exchange (DCE) reactions. Despite fact that two processes, namely neutrinoless and DCE reactions, are triggered weak strong interaction respectively, important analogies suggested. The basic point is coincidence initial final state many-body wave functions in types processes formal similarity transition...
Purpose: We want to analyze transitions low-lying excited states of the residual and ejectile nuclei in 76Se(18O, 17O) 77Se one-neutron stripping reaction at 275-MeV incident energy determine role single-particle core excitation description measured cross sections. In addition, we explore sensitivity calculated section different nuclear structure models. Methods: The spectrum differential cross-section angular distributions are using MAGNEX large acceptance magnetic spectrometer for...
Neutrinos are so far the most elusive known particles, and in last decades many sophisticated experiments have been set up order to clarify several questions about their intrinsic nature, particular masses, mass hierarchy, nature of Majorana or Dirac particles. Evidence Neutrinoless Double-Beta Decay (NDBD) would prove that neutrinos thus improving understanding universe itself. Besides search for large underground direct experimental detection NDBD, NUMEN experiment proposes investigation a...
Background: Nucleon transfer reactions are selective tools for nuclear physics investigations. The theoretical and computational limits affecting in the past their data analysis could be nowadays surmounted thanks to advent of methods with refined approximations constraints, even when heavy-ion collisions considered.Purpose: Modern microscopic calculations heavy-ion-induced combined precise experimental offer chance accurately testing different reaction models as well structure description...
Previously reported data for fusion of the $^{8}\mathrm{B}+(^{58}\mathrm{Ni},^{28}\mathrm{Si})$ systems are critically reviewed. New $\ensuremath{\alpha}\text{-particle}$ from $^{8}\mathrm{B}+^{58}\mathrm{Ni}$ also reported, but paper is mostly based on using realistic calculations well-established codes to reanalyze previous data. The influence breakup protons evaporation proton measurements heavier system found be small at all energies except lowest one measured, and corrections made this...
Background: An accurate description of the initial and final state interactions in $^{18}\mathrm{O}+^{76}\mathrm{Se}$ collision is demanded by NUMEN project. The study single double charge exchange nuclear reactions main purpose for NUMEN, since these can be used as tools to provide experimentally driven information about matrix elements interest context neutrinoless double-$\ensuremath{\beta}$ decay. To date, details optical potentials response isospin operators many projectile-target...
Evaporation proton yields were measured for the fusion of radioactive proton-rich nucleus $^{7}\mathrm{Be}$ onto a $^{58}\mathrm{Ni}$ target at six near-barrier energies. Total cross sections deduced by using calculated multiplicities. The resulting excitation function shows considerable enhancement with respect to calculations bare potential, even energies above Coulomb barrier. Inelastic couplings can account highest energy. channels nearly saturate total reaction section in energy region....
In earlier works, the fusion cross section for 16O+16O reaction has been measured using different techniques. present work, we have obtained an experimental excitation function γ-ray spectroscopy. The measurements were performed at center-of-mass energies between 8.28 and 12.25 MeV. theoretical predictions with a coupled-channel model are consistent data. From our analyses, extrapolated S-factor value 6.6 MeV, corresponding to Gamow peak energy core oxygen burning conditions, is about 3.6 ×...
Evaporation-proton yields were measured for the fusion of weakly bound nucleus $^{6}\mathrm{Li}$ on a $^{58}\mathrm{Ni}$ target at six near- or sub-barrier bombarding energies. Effects one-neutron transfer reaction estimated and corrections made. Total-fusion cross sections deduced using calculated proton multiplicities. The resulting excitation function shows considerable enhancement with respect to calculations bare potential. Inelastic couplings are have insignificant effects such fusion....
Evaporation protons from the fusion of ${}^{3}\mathrm{He}{+}^{58}$Ni system were measured at three energies near but above Coulomb barrier. The respective elastic scattering angular distribution was also determined for one these energies. data, after being properly reduced to eliminate size and charge effects, are compared recently excitation function proton-halo ${}^{8}\mathrm{B}{+}^{58}$Ni. As a reference, data ${}^{16}\mathrm{O}{+}^{58}$Ni presented. With respect this cross sections...
Recently, experimental measurements of elastic scattering angular distributions for the system7Li+58Ni at ten different energies around Coulomb barrier were made by Heavy-Ion Group. The Tandem Van de Graaff Particle Accelerator Laboratory in National Institute Nuclear Research (ININ) Mexico. In this work, preliminary five (Elab, = 12.0, 12.5, 13.0, 13.5 and 14.22 MeV) are presented. data analyzed using São Paulo Optical Model Potential (SPP) which is based on a double-folding potential,...
Elastic scattering angular distributions for the 9Be+51V system were measured at three near Coulomb barrier energies, Elab = 16.35, 17.44 and 18.53 MeV. The data analyzed by using a Semimicroscopic Optical Model. This combines microscopic calculation of mean-field double folding potential phenomenological construction dynamical polarization potential. calculations reproduced very well total reaction cross sections also calculated.
Preliminary results for the elastic scattering of Super-Borromean nucleus10C on27Al are presented, at Elab = 29 MeV. Taking Sao Paulo potential as bare potential, possible polarization potentials investigated by adding a volume and surface complex term to account fusion direct couplings, respectively. Besides an imaginary short-range simulate bulk fusion, best-fit turns out be real has effect shifting barrier radius up 0.6 fm, thus suggesting enhancement.
Recent near-barrier measurements for fusion of the proton-halo system 8B + 58Ni (Aguilera E F et al. 2011 Pys. Rev. Lett. 107 092701) showed unexpected results. In contrast to previous results neutron-halo systems, instance, respective cross sections are enhanced both, below- and above-barrier energies. The charged nature halo could thus have an effect on mechanism. Within this context, in present work several proton rich systems compared each other. Three these correspond same target, (with...
We have performed continuum-discretized coupled channels (CDCC) calculations of the breakup 8B on 58Ni in energy interval 10 – 26 MeV c.m. system. Elastic scattering angular distributions for + system at five different energies around Coulomb barrier were studied by using CDCC model and taking into account a coupling between elastic channels. The energy-dependent sets found OPs parameters reproduce well data fusion reaction cross sections. Finally, comparison reduced total sections with 6He...
A fusion excitation function for the 8B+58Ni proton-halo system at near Coulomb barrier energies was recently published (Aguilera E F et al. 2011 Phys. Rev. Lett. 107 092701). The respective cross sections (σfus) were determined from integrated evaporated protons (σp), by using proton multiplicities (Mp) calculated with code PACE. In this code, transmission coefficients Tl are only compound-nucleus values of and Z an extrapolation is then made subsequent decays. present work, reliability...
The study of a network nuclear reactions populated in the 18 O + 12 C collision is main topic present paper. It was performed to test structure and reaction theories describing full mechanism occurring ( O, F) single charge exchange reaction. From experimental side, an beam produced at 275 MeV incident energy by K800 superconducting cyclotron MAGNEX magnetic spectrometer used Laboratori Nazionali del Sud Istituto Nazionale di Fisica Nucleare momentum analyse ejectiles within same setup....