Single-neutron states in 133Sn and 209Pb, which are analogous to single electrons outside of closed atomic shells in alkali metals, were populated by the (9Be,8Be) one-neutron transfer reaction in ...inverse kinematics using particle-gamma coincidence spectroscopy. In addition, the s1/2 single-neutron hole-state candidate in 131Sn was populated by (9Be,10Be). Doubly closed-shell 132Sn (radioactive) and 208Pb (stable) beams were used at sub-Coulomb barrier energies of 3 MeV per nucleon. Level energies, gamma-ray transitions, absolute cross sections, spectroscopic factors, asymptotic normalization coefficients, and excited-state lifetimes are reported and compared to shell-model expectations. The results include a new transition and precise level energy for the 3p1/2 candidate in 133Sn, new absolute cross sections for the 1h9/2 candidate in 133Sn and 3s1/2 candidate in 131Sn, and new lifetimes for excited states in 133Sn and 209Pb. This is the first report on excited-state lifetimes of 133Sn, which provide a unique signature of the single-neutron states and 132Sn double-shell closure.
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CMK, CTK, FMFMET, IJS, NUK, PNG, UM
One of main sources of uncertainty in modern cosmology is the present rate of the universe's expansion, H0, called the Hubble constant. Once again, different observational techniques bring about ...different results, causing new 'Hubble tension'. In the present work, we review the historical roots of the Hubble constant from the beginning of the twentieth century, when modern cosmology originated, to the present. We develop the arguments that gave rise to the importance of measuring the expansion of the Universe and its discovery, and we describe the different pioneering works attempting to measure it. There has been a long dispute on this matter, even in the present epoch, which is marked by high-tech instrumentation and, therefore, in smaller uncertainties in the relevant parameters. It is, again, currently necessary to conduct a careful and critical revision of the different methods before one invokes new physics to solve the so-called Hubble tension.
Se presenta el modelo epidemiológico SIR que se aplicó a tres epidemias: dos históricas y una de brote reciente; esta última fue la del virus AH1N1 que apareció en México y en otras naciones. El ...modelo sir, a pesar de su simplicidad, describe adecuadamente las tres epidemias. En general, las curvas de predicción del modelo se ajustan muy bien a los datos. El modelo requiere el conocimiento de datos históricos confiables o bien datos precisos actuales.Estos datos no siempre se tienen y por ende las predicciones resultan verdaderas sólo cualitativamente y no correctas en detalle. Éste fue el caso de la de la epidemia del virus AH1N1 en México.
We present the SIR epidemiological model, applied to three epidemics: two historical and one recent outbreak. The latter was produced by AH1N1 virus which appeared in Mexico and other nations. Despite its simplicity the SIR model adequately describes the three epidemics. In general, the prediction curves of the model fit very well to the data. The model requires the knowledge of reliable historical data or current accurate data. These data are not always at hand and therefore the predictions are true only qualitatively but are not correct in detail. This was the case of the AH1N1 virus epidemic in Mexico.
We present results and discuss the use of aluminum nitride as a promising source material for Accelerator Mass Spectrometry (AMS) and Radioactive Ion Beams (RIBs) science applications of 26Al ...isotopes. The measurement of 26Al in geological samples by AMS is typically conducted on Al2O3 targets. However, Al2O3 is not an ideal source material because it does not form a prolific beam of Al- required for measuring low-levels of 26Al. Multiple samples of aluminum oxide (Al2O3), aluminum nitride (AlN), mixed Al2O3–AlN as well as aluminum fluoride (AlF3) were tested and compared using the ion source test facility and the stable ion beam (SIB) injector platform at the 25-MV tandem electrostatic accelerator at Oak Ridge National Laboratory. Negative ion currents of atomic and molecular aluminum were examined for each source material. It was found that pure AlN targets produced substantially higher beam currents than the other materials and that there was some dependence on the exposure of AlN to air. The applicability of using AlN as a source material for geological samples was explored by preparing quartz samples as Al2O3 and converting them to AlN using a carbothermal reduction technique, which involved reducing the Al2O3 with graphite powder at 1600 °C within a nitrogen atmosphere. The quartz material was successfully converted to AlN. Thus far, AlN proves to be a promising source material and could lead towards increasing the sensitivity of low-level 26Al AMS measurements. The potential of using AlN as a source material for nuclear physics is also very promising by placing 26AlN directly into a source to produce more intense radioactive beams of 26Al.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
The objective of the study was to evaluate the effects of a multidisciplinary intervention on the outcomes of polypathological patients (PP).
A multicenter quasi-experimental pre-post study with a ...12-month follow up was performed. In-hospital, at discharge and outpatient clinics patients who met criteria of PP between March 2012 and October 2013 were included. The multidisciplinary approach was defined by 11 interventions performed by general practitioners, internal medicine physicians, team care nurses and hospital pharmacists. The primary outcome was reduction in the number of hospital admissions and days of hospitalization. Secondary outcomes included mortality and the effects of 11 interventions on mortality.
420 patients were included. Mean patient age was 77.3 (SD: 8.90) and average number of PP defining categories was 2.99 (SD: 1.00). Number of hospital admissions and days of hospitalization decreased significantly after intervention: 1.52 (SD: 1.35) versus 0.82 (SD: 1.29), p<0.001, and 13.77 (SD: 15.20) versus 7.21 (SD: 12.90), p<0.001 respectively. 12-month mortality was 37.7%. PP who failed to receive a structured medical visit from the internal medicine physician and educational workshops from the team care nurses had a higher risk of exitus in the next 12 months, HR: 1.68; 95% CI: 1.15–2.46, p=0.007 and HR: 2.86; 95% CI: 1.92–4.27, p<0.001, respectively.
This multidisciplinary intervention reduced the risk of PP hospital admission and days of hospitalization. Educational workshop programs for PP and their caregivers and structured IM medical visits were associated with improvements of survival.
El objetivo del estudio fue evaluar los resultados en salud tras la implantación de una intervención multidisciplinar a pacientes pluripatológicos (PP).
Se realizó un estudio multicéntrico antes-después cuasi-experimental, con seguimiento a 12 meses. Se incluyeron pacientes que cumplían los criterios de PP entre marzo de 2012 y octubre de 2013, tanto en el ámbito hospitalario como en atención primaria. El enfoque multidisciplinar fue definido por 11 intervenciones realizadas por médicos de familia, médicos internistas, enfermeras y farmacéuticos hospitalarios. El resultado fundamental fue la reducción en el número de ingresos hospitalarios y días de hospitalización al año de seguimiento. Los resultados secundarios incluyeron la mortalidad y los efectos de las intervenciones sobre la misma.
Se incluyeron 420 pacientes. La edad media de los pacientes fue de 77,3 (DE: 8,90) y la media de categorías definitorias de PP fue de 2,99 (DE: 1,00). El número de ingresos hospitalarios y los días de hospitalización disminuyeron significativamente después de la intervención: 1,52 (DE: 1,35) versus 0,82 (DE: 1,29), p<0,001 y 13,77 (DE: 15,20) versus 7,21 (DE: 12,90), p<0,001, respectivamente. La mortalidad a los 12 meses fue del 37,7%. Los PP que no recibieron la visita médica estructurada del médico internista tras la inclusión y los talleres educativos de las enfermeras tuvieron un mayor riesgo de exitus en los 12 meses de seguimiento, HR: 1,68; IC del 95%: 1,15-2,46, p=0,007 y HR: 2,86; IC del 95%: 1,92-4,27, p<0,001, respectivamente.
Esta intervención multidisciplinaria reduce el riesgo de ingreso y los días de ingreso hospitalario en PP. Los programas de talleres educativos para PP y sus cuidadores, y las visitas médicas estructuradas por parte de medicina interna se asociaron con una mayor supervivencia.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
The Majorana Demonstrator is a planned 40 kg array of Germanium detectors intended to demonstrate the feasibility of constructing a tonne-scale experiment that will seek neutrinoless double beta ...decay (0νββ) in 76Ge. Such an experiment would require backgrounds of less than 1 count tonne-year in the 4 keV region of interest around the 2039 keV Q-value of the ββ decay. Designing low-noise electronics, which must be placed in close proximity to the detectors, presents a challenge to reaching this background target. This paper will discuss the Majorana collaboration's solutions to some of these challenges.
The MAJORANA DEMONSTRATOR will search for the neutrinoless double beta decay (ββ(0ν)) of the isotope 76Ge with a mixed array of enriched and natural germanium detectors. In view of the next ...generation of tonne-scale germanium-based ββ(0ν)-decay searches, a major goal of the MAJORANA DEMONSTRATOR is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest (ROI) around the 2039-keV Q-value of the 76Ge ββ(0ν)-decay. Such a requirement on the background level significantly constrains the design of the readout electronics, which is further driven by noise and energy resolution performances. We present here the low-noise low- background front-end electronics developed for the low-capacitance p-type point contact (P-PC) germanium detectors of the MAJORANA DEMONSTRATOR. This resistive-feedback front-end, specifically designed to have low mass, is fabricated on a radioassayed fused-silica substrate where the feedback resistor consists of a sputtered thin film of high purity amorphous germanium and the feedback capacitor is based on the capacitance between gold conductive traces.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
498.
A Dark Matter Search with MALBEK Giovanetti, G. K.; Avignone Iii, Frank; Bertrand Jr, Fred E. ...
03/2015, Volume:
61
Conference Proceeding
Open access
The Majorana Demonstrator is an array of natural and enriched high purity germanium detectors that will search for the neutrinoless double-beta decay of 76Ge and perform a search for weakly ...interacting massive particles (WIMPs) with masses below 10 GeV. As part of the Majorana research and development efforts, we have deployed a modified, low-background broad energy germanium detector at the Kimballton Underground Research Facility. With its sub-keV energy threshold, this detector is sensitive to potential non-Standard Model physics, including interactions with WIMPs. We discuss the backgrounds present in the WIMP region of interest and explore the impact of slow surface event contamination when searching for a WIMP signal.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Theoretically, four broad and overlapping low-lying 10N resonances are expected which may not be clearly identifiable only with the excitation function. In order to resolve very wide resonance states ...overlapping with each others, we plan to measure vector analyzing power together with excitation function. The level structure of 10N is important to discuss resonances in 10Li since 10N and 10Li are mirror nuclei that are expected to have similar structure. The 10Li structure provides us with valuable information for constructing the three-body model of the borromean 11Li nucleus. Test experiment was conducted at RIPS, RIKEN where we measured excitation function with 4.2MeV/u low-energy 9C beam. In the presentation, results of the test experiment will be presented. Need for analyzing power measurement will be discussed to identify broad and resonances in 10N structure.
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