A5078237972- Nuclear physics research studies
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Advanced NMR Techniques and Applications
- Astronomical and nuclear sciences
- Nuclear Physics and Applications
- Particle accelerators and beam dynamics
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Quantum chaos and dynamical systems
- Scientific Research and Discoveries
- Medical Imaging Techniques and Applications
- Nuclear reactor physics and engineering
- Radioactive Decay and Measurement Techniques
- Quantum, superfluid, helium dynamics
- Astro and Planetary Science
- Spacecraft and Cryogenic Technologies
- Dark Matter and Cosmic Phenomena
- Social Sciences and Policies
- Atomic and Subatomic Physics Research
- Global Energy and Sustainability Research
- Superconducting Materials and Applications
- Image and Object Detection Techniques
- Mesenchymal stem cell research
University of Concepción
2015-2025
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud
2019
Yale University
2007-2016
University of Jyväskylä
2016
Hospital Universitari i Politècnic La Fe
2013
Center for Theoretical Biological Physics
2011
Instituto de Estructura de la Materia
2010-2011
Universidad de Sevilla
2000-2010
Consejo Superior de Investigaciones Científicas
2009-2010
Universidad Nacional Autónoma de México
2003-2009
We present a formalism for calculating nuclear matrix elements of double-$\ensuremath{\beta}$ decay within the framework microscopic interacting boson model. calculate Fermi, Gamow-Teller, and tensor in Ge-Se-Mo-Te-Xe-Nd-Sm compare our results with those shell-model (SM) quasiparticle random-phase approximation (QRPA). Our are agreement QRPA. discuss simple features give formula that allows one to estimate terms number valence proton neutron pairs.
Background: Direct determination of the neutrino mass through double-$β$ decay is at present time one most important areas experimental and theoretical research in nuclear particle physics. Purpose: We calculate matrix elements for extraction average neutrinoless decay. Methods: The microscopic interacting boson model (IBM-2) used. Results: Nuclear closure approximation are calculated $^{48}$Ca, $^{76}$Ge, $^{82}$Se, $^{96}$Zr, $^{100}$Mo, $^{110}$Pd, $^{116}$Cd, $^{124}$Sn, $^{128}$Te,...
We introduce a method for isospin restoration in the calculation of nuclear matrix elements (NMEs) $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ and $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay within framework microscopic interacting boson model (IBM-2). With this method, we calculate NMEs all processes interest $0\ensuremath{\nu}{\ensuremath{\beta}}^{\ensuremath{-}}{\ensuremath{\beta}}^{\ensuremath{-}}$...
Neutrinoless double-$\beta$ decay is of fundamental importance for the determining neutrino mass. By combining a calculation nuclear matrix elements within framework microscopic interacting boson model (IBM-2) with an improved phase space factors, we set limits on average light mass and inverse heavy (flavor violating parameter).
Myocardial infarction is a major public health problem that causes significant mortality despite recent advances in its prevention and treatment. Therefore, approaches based on adult stem cells represent promising alternative to conventional therapies for this life-threatening condition. Mesenchymal (MSCs) are self-renewing pluripotent have been isolated from multiple tissues differentiate various cell types. Here we analyzed the capacity of MSCs human bone marrow (BMSC), adipose tissue...
We discuss the Garvey-Kelson mass relations in an extended formalism and show how they can be used to test improve consistency of most commonly formulas achieve more accurate predictions.
It has been suggested that chaotic motion inside the nucleus may significantly limit accuracy with which nuclear masses can be calculated. Using a power spectrum analysis we show inclusion of additional physical contributions in mass calculations, through many-body interactions or local information, removes signal discrepancies between calculated and measured masses. Furthermore, systematic application global formulas set relationships among neighboring nuclei to more than 2000 allows one an...
The $^{110}\mathrm{Pd}$ double-$\ensuremath{\beta}$ decay $Q$ value was measured with the Penning-trap mass spectrometer ISOLTRAP to be $Q=2017.85(64)\text{ }\text{ }\mathrm{keV}$. This shifted by 14 keV compared literature and is 17 times more precise, resulting in new phase-space factors for two-neutrino neutrinoless modes. In addition a set of relevant matrix elements has been calculated. expected half-life mode reevaluated as $1.5(6)\ifmmode\times\else\texttimes\fi{}{10}^{20}\text{...
Nuclear matrix elements (NME) for exchange of arbitrary mass neutrinos are calculated in the interacting boson model (IBM-2). By combining NME with phase space factors (PSF), expected half-lives $m_N$ and coupling $U_{eN}$ estimated. Limits on sterile masses eV, keV, MeV-GeV, TeV range given.
Direct determination of the neutrino mass is at present time one most important aims experimental and theoretical research in nuclear particle physics. A possible way detection through neutrinoless double electron capture, $0\nu ECEC$. This process can only occur when energy initial state matches precisely that final state. We here a calculation prefactors (PF) matrix elements (NME) within framework microscopic interacting boson model (IBM-2) for $^{124}$Xe, $^{152}$Gd, $^{156}$Dy,...
A complete calculation of phase space factors (PSF) for Majoron emitting $0\nu\beta^-\beta^-$ decay modes is presented. The makes use exact Dirac wave functions with finite nuclear size and electron screening includes life-times, single spectra, summed angular correlations. Combining these results recent interacting boson matrix elements (NME) we make half-life predictions the ordinary (spectral index $n$=1). Furthermore, comparing theoretical obtained experimental lower bounds this mode are...
A systematic study of isotope chains in the rare-earth region is presented. For ${}_{60}^{144\ensuremath{-}154}\mathrm{Nd},$${}_{62}^{146\ensuremath{-}160}\mathrm{Sm},$${}_{64}^{148\ensuremath{-}162}\mathrm{Gd},$ and ${}_{66}^{150\ensuremath{-}166}\mathrm{Dy},$ energy levels, E2 transition rates, two-neutron separation energies are described by using most general (up to two-body terms) interacting boson model (IBM) Hamiltonian. each chain a fit performed such way that all parameters but one...
Neutrinoless double-$\beta$ decay is of fundamental importance for determining the neutrino mass. Although double electron ($\beta^-\beta^-$) most promising mode, in very recent years interest positron ($\beta^+\beta^+$) decay, emitting capture ($EC\beta^+$), and ($ECEC$) has been renewed. We present here results a calculation nuclear matrix elements neutrinoless double-$\beta^+$ within framework microscopic interacting boson model (IBM-2) $^{58}$Ni, $^{64}$Zn, $^{78}$Kr, $^{96}$Ru,...
The nucleus $^{154}\mathrm{Gd}$ is located in a region of the nuclear chart where rapid changes deformation occur as function particle number. It was investigated using combination $\ensuremath{\gamma}$-ray scattering experiments and $\ensuremath{\gamma}\ensuremath{\gamma}$-coincidence study following electron capture decay $^{154}\mathrm{Tb}^{m}$. A novel channel from scissors mode to first excited ${0}^{+}$ state observed. Its transition strength determined...
We have developed a new method to calculate the occupancies of single particle levels in atomic nuclei. This has been context microscopic interacting boson model, which neutron and proton degrees freedom are treated explicitly. The energies constitute very important input for calculation this method. In principle these can be considered as parameters that fitted reproduce experimental occupancies. Instead fitting, study we extracted from data on nuclei with more or one less than shell...
We have performed a systematic study of the spectroscopic properties isotopic chain $^{214\ensuremath{-}226}\mathrm{Rn}$ using $spdf$-IBM-2 interacting boson model. This model includes octupole degrees freedom, what allows description negative- and positive-parity states with same Hamiltonian. discuss how this is able to describe transition from vibrational rotational spectra in these nuclei rather small set parameters, which were obtained reproduce $^{214\ensuremath{-}222}\mathrm{Rn}$. Then...
$\ensuremath{\beta}$-decay rates of $^{121--131}\mathrm{Cs}$ have been calculated in the framework neutron-proton interacting boson-fermion model (IBFM-2). For odd-$A$ nuclei, decay operator can be written a relatively simple form terms one-nucleon transfer operator. Previous studies $\ensuremath{\beta}$ IBFM-2 were based on obtained by using number approximation (NOA). In this work new operator, derived microscopically without NOA approximation, is used. The results from both approaches are...
A new procedure is presented that combines well-known nuclear models with image reconstruction techniques. color-coded built by taking the differences between measured masses and predictions given different theoretical models. This viewed as part of a larger array in ($N,Z$) plane, where unknown are hidden, covered ``mask.'' We apply suitably adapted deconvolution algorithm, used astronomical observations, to ``open window'' see rest pattern. show it possible improve significantly mass...
Recent advances in the theory of 0νββ decay are briefly discussed. A complete list nuclear matrix elements within framework Interacting Boson Model (IBM‐2) is given. Results a novel calculation phase space factors with exact Dirac wave functions and electron screening also presented.
The spectroscopic strengths of two-nucleon transfer reactions constitute a stringent test for correlations in the nuclear wave functions. A set closed analytic expressions ratios factors is derived framework supersymmetry. These are parameter independent and provide direct comparison between recently measured 198Hg(d-->,alpha)196Au reaction predictions from quartet supersymmetry lends further support to validity physics.