10 research outputs found
Direct high-precision mass spectrometry of superheavy elements with SHIPTRAP
Direct mass measurements in the region of the heaviest elements were performed with the Penning-trap
mass spectrometer SHIPTRAP at GSI Darmstadt. Utilizing the phase-imaging ion-cyclotron-resonance massspectrometry
technique, the atomic masses of 251No (Z = 102), 254Lr (Z = 103), and 257Rf (Z = 104) available
at rates down to one detected ion per day were determined directly for the first time. The ground-state masses of
254No and 255,256Lr were improved by more than one order of magnitude. Relative statistical uncertainties as low
as δm/m ≈ 10−9 were achieved. Mass resolving powers of 11 000 000 allowed resolving long-lived low-lying
isomeric states from their respective ground states in 251,254No and 254,255Lr. This provided an unambiguous
determination of the binding energies for odd-A and odd-odd nuclides previously determined only indirectly
from decay spectroscopy.Federal Ministry of Education & Research (BMBF) 05P15HGFNA
05P19HGFNA
05P21HGFN1
05P15UMFNA
05P21UMFN1Max Planck SocietyFoundation CELLEXNetherlands Organization for Scientific Research (NWO) 680-91-103European Commission under Marie Sklodowska-Curie Action FP7 MSC COFUND scheme
European Research Council (ERC) 819957Ministry of Science and Innovation, Spain (MICINN)
Spanish Government FPA2015-67694-P
PID2019-104093GB-I00/AE
Production of Fock Mixtures in Trapped Ions for Motional Metrology
J.C. acknowledges support from Ministerio de Ciencia, Innovación y Universidades
(Spain) (“Beatriz Galindo” Fellowship BEAGAL18/00081). D.R. acknowledges support
from Junta de Andalucía through the project P18-FR-3432.We present a protocol to produce a class of non-thermal Fock state
mixtures in trapped ions. This class of states features a clear metrological advantage
with respect to the ground state, thus overcoming the standard quantum limit without
the need for full sideband cooling and Fock-state preparation on a narrow electronic
transition. The protocol consists in the cyclic repetition of red-sideband, measurement
and preparation laser pulses. By means of the Kraus map representation of the
protocol, it is possible to relate the length of the red sideband pulses to the specific
class of states that can be generated. With the help of numerical simulations, we
analyze the parametric regime where these states can be reliably reproduced.Ministerio de Ciencia, Innovación y Universidades
(Spain) BEAGAL18/00081Junta de Andalucía P18-FR-343
Coupled-oscillator model to analyze the interaction between a quartz resonator and trapped ions
The novel application of a piezoelectric quartz resonator for the detection of trapped ions has enabled
the observation of the quartz-ions interaction under nonequilibrium conditions, opening new perspectives for
high-sensitive motional frequency measurements of radioactive particles. Energized quartz crystals have (long)
decay-time constants in the order of milliseconds, permitting the coherent detection of charged particles within
short time scales. In this paper we develop a detailed model governing the interaction between trapped 40Ca+
ions and a quartz resonator connected to a low-noise amplifier. We apply this model to experimental data
and extract the ions’ reduced-cyclotron frequency in our 7-T Penning trap setup. We also obtain an upper
limit for the coupling constant g with the present quartz-amplifier-trap (QAT) configuration. The study of the
reduced-cyclotron frequency is especially important for the use of this resonator in precision Penning-trap mass
spectrometry. The improvement in sensitivity can be accomplished by increasing the quality factor of the QAT
configuration, which in turn will improve the performance of the system towards the strong-coupling regim
Formation of two-ion crystals by injection from a Paul-trap source into a high-magnetic-field Penning trap
Two-ion crystals constitute a platform for investigations of quantum nature that can be extended to any ion
species or charged particle provided one of the ions in the crystal can be directly laser cooled and manipulated
with laser radiation. This paper presents the formation of two-ion crystals for quantum metrology in a 7-tesla
open-ring Penning trap. 40Ca+ ions are produced either internally by photoionization or externally in a (Paul-trap)
source, transported through the strong magnetic field gradient of the superconducting solenoid, and captured
in-flight with a mean kinetic energy of a few electronvolts with respect to the minimum of the Penning-trap
potential well. Laser cooling of the two-ion crystal in a strong magnetic field towards reaching the quantum
regime is also presented, with particular emphasis on the cooling of the radial modes.Spanish Government PID2019-104093GB-I00/AEI/10.013 39/501100011033Andalusian Government P18FR-3432
PTA2018-016573-IFondo Operativo FEDER A-FQM-425-UGR18Spanish Government FPU17/02596University of Granada "Plan Propio -Programa de Intensificacion de la Investigacion" PP2017-PRI.I-04Laboratorios Singulares 2020European Research Council (ERC)
European Commission 278648TRAPSENSOR
MICINN/FEDER/UGR FPA2015-67694-P
FPA2012-32076
UNGR10-1E501
UNGR13-1E-1830
EQC2018-005130-PJunta de AndaluciaEuropean Commission IE-5713
IE2017-5513Spanish MICINN ("Beatriz Galindo" Fellowship) BEAGAL18/00078German Research Foundation (DFG)European Commission SFB/CRC 122
Detection of Relevant Heavy Metal Concentrations in Human Placental Tissue: Relationship between the Concentrations of Hg, As, Pb and Cd and the Diet of the Pregnant Woman
Heavy metals can cross the placental barrier and reach the fetal compartment, threatening fetal development. Pregnant women can acquire these through food, drinking water, toxic habits or simply by breathing polluted air. The placenta has been described as a biomarker of maternal and fetal exposure to different toxic elements. Objectives: The main objective of this study was to test the possible existence of heavy metal deposits (Pb, As, Cd and Hg) in the placentas of women who gave birth at term in our setting, analyzing the influence of daily life and dietary habits. Methods: We studied 103 placentas, obtained by consecutive sampling, of women that delivered in the Regional Maternity Hospital of Malaga between March and June, 2021. As, Cd and Pb concentrations were analyzed using mass spectrometry techniques. Hg concentration was studied according to US EPA method 7473. Women also answered a questionnaire with epidemiological variables. Results: Detectable concentrations were found in 14.56% [As], 44.6% [Cd], 81.5% [Pb] and 100% [Hg]. [Pb] and [As] correlated significantly (Spearman’s Rho of 0.91 and <0.001), as did [Hg] and [Cd] (Spearman’s Rho 0.256, p < 0.004). The [Pb] and [AS] concentrations were significantly higher in cases of tap water consumption. [Hg] concentrations predicted the birth weight of female newbornsThis research received no external funding. This article is part of Soledad Molina-Mesa’s doctoral thesis. Partial funding for open access charge: Universidad de Málag
The TRAPSENSOR facility: an open-ring 7 tesla Penning trap for laserbased precision experiments
APenning-trap facility for high-precision mass spectrometry based on a novel detection method has
been built. This method consists in measuring motional frequencies of singly-charged ions trapped in
strong magnetic fields through the fluorescence photons from laser-cooled 40Ca+ ions, to overcome
limitations faced in electronic single-ion detection techniques. The key element of this facility is an
open-ring Penning trap coupled upstream to a preparation Penning trap similar to those used at
Radioactive Ion Beam facilities. Here we present a full characterization of the trap and demonstrate
motional frequency measurements of trapped ions stored by applying external radiofrequency fields
in resonance with the ions’ eigenmotions, in combination with time-of-flight identification. The
infrastructure developed to observe the fluorescence photons from 40Ca+, comprising the 12 laser
beams and the optical system to register the image in a high-sensitive CCD sensor, has been proved by
taking images of the trapped and cooled 40Ca+ ions. This demonstrates the functionality of the
proposed laser-based mass-spectrometry technique, providing a unique platform for precision
experiments with implications in different fields of physics.This work was supported by the European Research Council (contract no. 278648-TRAPSENSOR), from the
SpanishMINECO/ FEDER (project nos. FPA2012-32076, FPA2015-67694-P, FIS2015-69983-P, UNGR10-1E-
501, UNGR13-1E-1830), Ramón y Cajal Grant RYC-2012-11391, Juan de la Cierva grant IJCI-2015-26091,
Centro Nacional de Partículas, Astropartículas y Nuclear CPAN13-TM01, and ‘Sistema Nacional de Garantía
Juvenil y del Programa Operativo de Empleo Juvenil’; from the SpanishMECD(PhD grant nos. FPU15-04679
and FPU17/02596); from Junta de Andalucía/FEDER (project no. IE-57131) and ‘Programa de Empleo Juvenil;
from Basque Government (PhD grant no. PRE-2015-1-0394) and (project no. IT986-16), and from the
University of Granada ‘Plan propio-Programa de Intensificación de la Investigación PP2017-PRI.I-04’. I.A, L.L.
and E.S acknowledge also support from projects OpenSuperQ (820363) and QMiCS (820505) of the EUFlagship
on Quantum Technologies
Çédille, revista de estudios franceses
Presentació
Presentation
El pasado mes de abril iniciamos una nueva etapa en Çédille, representada principalmente por su traslado a la plataforma Open Journal System (OJS) de la Universidad de La Laguna, así como por la renovación y reasignación de competencias del Consejo de Redacción. Durante este tiempo, hemos tenido que adaptarnos, experimentar y comprender, pacientemente, el funcionamiento de esta nueva herramienta que es OJS. Ello ha supuesto, en algunos casos, que se hayan producido determinadas dificultades de comunicación con nuestros lectores y evaluadores, o que se hayan ocasionado pequeños retrasos en la gestión de la revista. Como nuestros seguidores saben, muy recientemente hemos sufrido, además, un ataque informático que no solo impidió el acceso a la plataforma durante varios días (justo en el momento final de producción de este número), sino que obligó a trasladar nuestro sitio web a otro servidor y a implementar nuevas medidas de seguridad. Afortunadamente, gracias al buen hacer y profesionalidad de Juan Ascanio Amigó, asesor técnico de OJS para la Universidad de La Laguna, hemos logrado salir airosos de los problemas, complicaciones y secuelas que nos hemos ido encontrando en este tiempo.
En este número que ahora ve la luz contamos con treinta y cuatro contri-buciones que superan, en total, las setecientas páginas. Así, Amelia Gamoneda Lanza y Francisco González Fernández se han encargado de coordinar una nueva entrega –la undécima– de la serie «Monografías», donde han reunido una ..
Late Holocene ecological history of Pinus pinaster forests in the Sierra de Gredos of central Spain
15 páginas, 4 figuras, 1 tabla.This article describes the patterns and processes of vegetation change and fire history in the Late Holocene (c. 2400 calendar year BP) palaeoecological sequence of Lanzahíta, Sierra de Gredos in central Spain, and provides the first Iberian pollen sequence undertaken within a monospecific Pinus pinaster woodland. These new data reassess not only the autochthonous nature of this pine species in the region and the Iberian Peninsula, but also the naturalness of well-developed cluster pine forests. Conflicts of palaeoecological evidence with phytosociological models of vegetation dynamics in the study region, and the relationships of P. pinaster with fire occurrence in Mediterranean-type ecosystems, are discussed.This study was funded by the projects
HAR2008-06477-C03-03/HIST, CGL-2006-2956-BOS (Plan
Nacional I + D + i, Ministry of Education and Science,
Spain), CSD2007-00058 (Consolider Program, Consejo
Superior de Investigaciones Científicas, Spain) and
Paleodiversitas Network (Fundación Séneca, Murcia).Peer reviewe