Phase equivalent potentials for three-body halos

We compare the properties of three-body systems obtained with two-body potentials with Pauli forbidden states and with the corresponding phase equivalent two-body potentials. In the first case the forbidden states are explicitly excluded in the calculation. Differences arise due to the off-shell properties of these on-shell equivalent potentials. We use the adiabatic hyperspherical method to formulate a practical prescription to exclude Pauli forbidden states in three-body calculations. Schematic as well as realistic potentials are used. Almost indistinguishable results are obtained.Comment: 18 pages, 6 figure

Comment on "New modes of halo excitations in the 6He nucleus"

We try to explain the differences in the 6He dipole strength function in refs. [1] and [2]. We perform the full basis calculation of the strength function with the same renormalized interaction as in [1] and show that the size of the basis, needed for converged calculations of the 6He continuum spectrum, is much larger than that for the discrete spectrum. The renormalized interaction of [1] therefore cannot be used for the continuum spectrum calculations with the same basis as for the ground state.Comment: 2 pages, 3 figure

LEVELING THE PLAYING FIELD: COVID-19’S IMPACT ON INTERSCHOLASTIC ATHLETIC PARTICIPATION IN NEW YORK STATE PUBLIC SCHOOLS: AN EX POST FACTO ANALYSIS OF DISTRICT DEMOGRAPHICS AND SPORT

Each year in New York state, tens of thousands of student-athletes participate in interscholastic athletics on over 15,000 public school teams. The purpose of this study was to evaluate the impact of the COVID-19 pandemic on interscholastic athletic participation rates in New York state public schools and their relationship to school districts’ demographics, including percentage of non-White students, percentage of economically disadvantaged students, total enrollment, and graduation rates. The sample consisted of 218 public school districts located throughout New York state, with approximately 20 participant districts from each of the 11 New York State Public High School Athletic Association’s governing sections. This study adds to the growing literature on equitable participation in interscholastic athletics. This ex post facto quantitative analysis relied on archived data from the New York State Public High School Athletic Association’s annual participation survey and the New York State Education Department’s enrollment data from the 2018–2019 and 2021–2022 school years. The data provided variables for path analysis that allowed the researcher to infer that the COVID-19 pandemic affected athletic participation across different demographics. It is important for educational leaders to consider equity and access to participation in interscholastic athletics and all of the associated benefits that attend such participation. The findings of this research provide additional quantitative data for educational leaders looking to build culturally responsive school communities that extend outside the classroom into the realm of extracurricular participation

The Continuum Structure of the Borromean Halo Nucleus 11Li

We solve the Faddeev equations for 11Li (n+n+9Li) using hyperspherical coordinates and analytical expressions for distances much larger than the effective ranges of the interactions. The lowest resonances are found at 0.65 MeV (1/2+, 3/2+, 5/2+) and 0.89 MeV (3/2+, 3/2-) with widths of about 0.35 MeV. A number of higher-lying broader resonances are also obtained and related to the Efimov effect. The dipole strength function and the Coulomb dissociation cross section are also calculated. PACS numbers: 21.45.+v, 11.80.Jy, 21.60.GxComment: 10 pages, LaTeX, 3 postscript figures, psfig.st

Isospin mixing and energy distributions in three-body decay

The structure of the second 2$^+$ resonance in $^{6}$Li is investigated with special emphasis on its isospin 0 components. The wave functions are computed in a three-body model ($\alpha$+$n$+$p$) using the hyperspherical adiabatic expansion method combined with complex scaling. In the decay into three free particles the symmetry conserving short-range interaction dominates at short distance whereas the symmetry breaking Coulomb interaction dominates at intermediate and large distances resulting in substantial isospin mixing. We predict the mixing and the energy distributions of the fragments after decay. Computations are consistent with available experiments. We conjecture that nuclear three-body decays frequently produce such large isospin mixing at large distance where the energy distributions. are determined.Comment: 5 pages, 4 figures, to be published in Physics Letters

Tests de bondad de ajuste para modelos de tipos de interés: un enfoque basado en procesos empíricos

Se propone un test de bondad de ajuste para la forma paramétrica de las funciones drift y volatilidad de modelos de tipos de interés. El test está basado en un proceso empírico marcado por los residuos. Se presenta una aplicación a modelos financieros simulados y los datos del EURIBOR

LOS SISTEMAS DE INFORMACIÓN COMO ELEMENTO ESTRATÉGICO DE LA FORMACIÓN GERENCIAL

La investigación realizada tiene como propósito analizar la inserción de los sistemas de información en la formación gerencial, realizando para ello una revisión de los diseños curriculares de las universidades nacionales que forman profesionales en administración, para establecer la existencia de cátedras destinadas al manejo de los sistemas de información en las escuelas de administración; así como la respectiva revisión de elementos teóricos que pudiesen brindar soporte a este estudio. La metodología empleada es de tipo descriptivo y la delimitación física se concreta a la Universidad del Zulia, Universidad Rafael Belloso Chacin y Universidad Nacional Experimental Rafael Maria Baralt ubicadas en el estado Zulia. Se concluyó que existen muchas limitaciones para la enseñanza de los sistemas de información, producto de insuficiencia presupuestaria para la dotación de infraestructura y equipos de punta que permitan una formación gerencial en coherencia con las exigencias de la sociedad actual. Se recomienda proporcionar tecnologías de punta a estas instituciones de educación superior ya que sus docentes consideran de suma importancia estos recursos instruccionales para incrementar las posibilidades de adecuar los resultados del proceso de enseñanza a las necesidades del entorno