Search results for "DECAY"

Distribution of radioactive elements in three progressively metamorphosed pelite series of the Bohemian Massif

1980

The variations of the content of radioactive elements in pelitic rocks in dependence on the grade of metamorphism were studied in three regions of the Bohemian Massif with a different character and age of metamorphism. The concentrations of Th, U and K were determined by gammaspectrometric method, the major elements Si, Ti, Al, Fe, Mn, Ca, K, P by the X-ray fluorescence method. An increasing mobility of radioactive elements was found with the help of variation diagrams in the higher stages of metamorphism, the migration being apparent especially for Th and usually starting in the garnet or biotite zone. A significant negative correlation of both Th and U content with the content of SiO2 was…

Hot dips and high temperature conditioning to improve shelf quality of late-crop cactus pear fruit (Opuntia ficus-indica L. Mill.)

1996

Dinamica del detrito fogliare fanerogamico lungo un gradiente di confinamento in un’area costiera a caratteristiche lagunari

2011

TRANSIZIONE AMBIENTALE E SVILUPPO SOSTENIBILE

2021

This paper explores the issues related to the principles of eco-sustainability by proposing a case study of sustainable regeneration in Sicily, whose intervention choices were made with respect for the environment and local traditions. General guidelines: reduction of energy consumption; use of recycled and recyclable materials; improvement of thermo-hygrometric conditions. Programming is based not only on performance control, but on an idea of global sustainability based on the use of urban greening systems.

Observation of a $\gamma$-decaying millisecond isomeric state in $^{128}$Cd$_{80}$

2017

A. Jungclaus et al. -- 6 pags., 5 figs., 2 tabs. -- Open Access funded by Creative Commons Atribution Licence 4.0

Discovery of the proton emitting nucleus $^{159}$Re

2007

Fund. para Cienc. Tecnol., FCT, Minist. Cienc. Tecnol.;Fundacao Calouste Gulbenkian;Fundacao Luso-Americana

Informe de las prácticas externas: Calibración de SiPM del plano de trazas del detector NEXT1-EL

2011

El objetivo de las prácticas externas realizadas en el Laboratorio de Reacciones Nucleares (IFIC) es familiarizarse con los sistemas de adquisición de datos de una cámara de Xenon gaseoso a alta presión (TPC), que es el elemento principal del experimento NEXT1-EL. Esta TPC es un prototipo de otra mayor que se instalará en el Laboratorio Subterráneo de Canfranc. En concreto, mis prácticas se han centrado en la caracterización y cálculo de ganancia de fotomultiplicadores de silicio (SiPM), detectores que se emplean en el plano de tracking de la TPC para visualizar la traza de las partículas ionizantes para poder hacer una selección topológica de los eventos de interés, candidatos a ser una de…

Cathodoluminescence decay kinetics in Ge+, Si+, O+ implanted SiO2 layers

2003

Abstract Cathodoluminescence spectral shapes and respective band decay times show no similarity between luminescence centers in different crystal and amorphous modifications of SiO2 and GeO2. On the other hand, the additionally produced red luminescence centers (650 nm) by oxygen implantation into SiO2 layers are of the same nature as in stoichiometric SiO2 and are attributed to the non-bridging oxygen hole center (NBOHC). On the other hand, the elevated blue luminescence (460 nm) in Si implanted SiO2 belongs to the silicon related oxygen deficient center (SiODC) as in stoichiometric layers also. Ge implantation into SiO2 and thermal post-annealing leads to a huge violet luminescence (400 n…

Palermo: lo Zen a l'arte della negoziazione pubblico-privato

2008

www.planum.net/

First-forbidden transitions in reactor antineutrino spectra

2019

© 2019 American Physical Society. We study the dominant forbidden transitions in the antineutrino spectra of the fission actinides from 4 MeV onward using the nuclear shell model. Through explicit calculation of the shape factor, we show the expected changes in cumulative electron and antineutrino spectra. Relative to the allowed approximation this results in a minor decrease of electron spectra above 4 MeV, whereas an increase of several percent is observed in antineutrino spectra. We show that forbidden transitions dominate the spectral flux for most of the experimentally accessible range. Based on the shell model calculations we attempt a parametrization of forbidden transitions and prop…