Nuclear emulsion with molybdenum filling for observation of ββ\beta\beta decay

The usage of nuclear emulsion with molybdenum filling for observation of $\beta\beta$ decay are shown to be possible. Estimates for 1 kg of $^{100}$Mo with zero background give the sensitivity for the $0\nu\beta\beta$ decay of $^{100}$Mo at the level of $\sim 1.5\cdot 10^{24}$ y for 1 year of measurement.Comment: 7 pages, 3 figure

New Results for Double-Beta Decay of Mo-100 to Excited Final States of Ru-100 Using the TUNL-ITEP Apparatus

The coincidence detection efficiency of the TUNL--ITEP apparatus designed for measuring half-life times of two-neutrino double-beta decay transitions to excited final states in daughter nuclei has been measured with a factor of 2.4 improved accuracy. In addition, the previous measuring time of 455 days for the study of the Mo-100 two-neutrino double-beta decay to the first excited 0+ state in Ru-100 has been increased by 450 days, and a new result (combined with the previous measurement obtained with the same apparatus) for this transition is presented: T_(1/2) = [5.5 (+1.2/-0.8) (stat) +/- 0.3 (syst)] x 10^20 y. Measured two-neutrino double-beta decay half-life times to excited states can be used to test the reliability of nuclear matrix element calculations needed for determining the effective neutrino mass from zero-neutrino double-beta decay data. We also present new limits for transitions to higher excited states in Ru-100 which, if improved, may be of interest for more exotic conjectures, like a bosonic component to neutrino statistics

Spectral modeling of scintillator for the NEMO-3 and SuperNEMO detectors

We have constructed a GEANT4-based detailed software model of photon transport in plastic scintillator blocks and have used it to study the NEMO-3 and SuperNEMO calorimeters employed in experiments designed to search for neutrinoless double beta decay. We compare our simulations to measurements using conversion electrons from a calibration source of $\rm ^{207}Bi$ and show that the agreement is improved if wavelength-dependent properties of the calorimeter are taken into account. In this article, we briefly describe our modeling approach and results of our studies.Comment: 16 pages, 10 figure

Technical design and performance of the NEMO3 detector

The development of the NEMO3 detector, which is now running in the Frejus Underground Laboratory (L.S.M. Laboratoire Souterrain de Modane), was begun more than ten years ago. The NEMO3 detector uses a tracking-calorimeter technique in order to investigate double beta decay processes for several isotopes. The technical description of the detector is followed by the presentation of its performance.Comment: Preprint submitted to Nucl. Instrum. Methods A Corresponding author: Corinne Augier ([email protected]

Results of the BiPo-1 prototype for radiopurity measurements for the SuperNEMO double beta decay source foils

The development of BiPo detectors is dedicated to the measurement of extremely high radiopurity in $^{208}$Tl and $^{214}$Bi for the SuperNEMO double beta decay source foils. A modular prototype, called BiPo-1, with 0.8 $m^2$ of sensitive surface area, has been running in the Modane Underground Laboratory since February, 2008. The goal of BiPo-1 is to measure the different components of the background and in particular the surface radiopurity of the plastic scintillators that make up the detector. The first phase of data collection has been dedicated to the measurement of the radiopurity in $^{208}$Tl. After more than one year of background measurement, a surface activity of the scintillators of $\mathcal{A}$($^{208}$Tl) $=$ 1.5 $\mu$Bq/m$^2$ is reported here. Given this level of background, a larger BiPo detector having 12 m$^2$ of active surface area, is able to qualify the radiopurity of the SuperNEMO selenium double beta decay foils with the required sensitivity of $\mathcal{A}$($^{208}$Tl) $<$ 2 $\mu$Bq/kg (90% C.L.) with a six month measurement.Comment: 24 pages, submitted to N.I.M.

Probing New Physics Models of Neutrinoless Double Beta Decay with SuperNEMO

The possibility to probe new physics scenarios of light Majorana neutrino exchange and right-handed currents at the planned next generation neutrinoless double beta decay experiment SuperNEMO is discussed. Its ability to study different isotopes and track the outgoing electrons provides the means to discriminate different underlying mechanisms for the neutrinoless double beta decay by measuring the decay half-life and the electron angular and energy distributions.Comment: 17 pages, 14 figures, to be published in E.P.J.

Implementación de estrategias de marketing para la empresa Importaciones Generales Nieto S. R. L. - 2017

El mercado ferretero del distrito de Nueva Cajamarca (San Martín, Perú) se encuentra en constante crecimiento, ya que cada día se destinan más áreas a la agricultura, siendo esta actividad realizada por el 55% de los pobladores del distrito. Al incrementar las áreas utilizadas para a la agricultura genera mayor demanda de herramientas y equipos para uso agrícola y forestal, generando que nuevas ferreterías inicien sus actividades comerciales. Es por ello que Importaciones Generales Nieto S.R.L. tuvo la necesidad de implementar estrategias para generar la repetición de compra por parte de los consumidores. La investigación tuvo como objetivo la implementación de estrategias generadas por un plan de marketing para lograr la repetición de compra, de esa forma aumentar el volumen de ventas y la participación de mercado. Se realizó un análisis previo de la situación de la empresa, se estudió a profundidad a los competidores, se hizo un estudio detallado del mercado donde se determinó como público objetivo a las personas que se dedican a la agricultura. Se aplicó una encuesta que permitió recolectar datos para elaborar estrategias como merchandising y publicidad; que tuvieron como fin generar un impacto positivo para la empresa. La implementación de estrategias generadas por el plan de márketing tuvo un costo de S/.2,671.25 mensuales. Como resultados por la aplicación de las estrategias fue: Las ventas del mes de noviembre fueron de S/.196,063.18, que respecto a las ventas del mes de noviembre del 2016 que fueron S/.178,869.66 esto representa un crecimiento del 9.6% de ventas mensuales.Tesi

New limits on the ββ{\beta\beta} decay of 130Te{^{130}Te} to excited states of 130Xe{^{130}Xe}

Experimental limits on half-lives of the $(0\nu + 2\nu)\beta\beta$ decay of $^{130}$Te to excited states of $^{130}$Xe are obtained using low-background HPGe detectors. At the 90% CL, these limits are equal to $1.6\cdot 10^{21}$ y, $2.7\cdot 10^{21}$ y and $2.3\cdot 10^{21}$ y for transitions to the $2^+_1$, $2^+_2$ and $0^+_1$ levels, respectively