Search results for "Conversion"

VADER: A novel decay station for actinide spectroscopy

2023

Nuclear instruments & methods in physics research / B 540, 148 - 150 (2023). doi:10.1016/j.nimb.2023.04.021

Determination of absolute internal conversion coefficients using the SAGE spectrometer

2016

Abstract A non-reference based method to determine internal conversion coefficients using the SAGE spectrometer is carried out for transitions in the nuclei of 154 Sm, 152 Sm and 166 Yb. The Normalised-Peak-to-Gamma method is in general an efficient tool to extract internal conversion coefficients. However, in many cases the required well-known reference transitions are not available. The data analysis steps required to determine absolute internal conversion coefficients with the SAGE spectrometer are presented. In addition, several background suppression methods are introduced and an example of how ancillary detectors can be used to select specific reaction products is given. The results o…

Conversion electron spectroscopy at IGISOL

2012

Conversion elecron spectroscopy has been an important part of the nuclear spectrocopy research at the Department of Physics of the University of Jyv¨askyl¨a since the commissioning of the first cyclotron in the mid 1970s. At the IGISOL facility a specialiced conversion electron spectrometer ELLI was developed in the late 1980s. The first results with ELLI were obtained using the beams from the old MC-20 cyclotron to study newly discovered isotopes of refractory fission products. In the present K130 cyclotron laboratory ELLI has been utilized in many decay-spectroscopy experiments both neutron-deficient and neutron-rich side of the valley of stability. In the early 2000s the new JYFLTRAP ion…

β-decay ofO13

2005

The beta decay of O-13 has been studied at the IGISOL facility of the Jyvaskyla accelerator centre (Finland). By developing a low-energy isotope-separated beam of O-13 and using a modern segmented charged-particle detector array an improved measurement of the delayed proton spectrum was possible. Protons with energy up to more than 12 MeV are measured and the corresponding log(ft) values extracted. A revised decay scheme is constructed. The connection to molecular states and the shell model is discussed.

High-precision mass measurement ofS31with the double Penning trap JYFLTRAP improves the mass value forCl32

2010

Nullité de plein droit. Nullité de toutes les mesures conservatoires. Conversion d'une saisie-conservatoire en saisie-attribution avant ou le jour du…

2005

International audience; (Com. 10 déc. 2002, Josse ès qualités c/ Sté Servinter , pourvoi n° 99-16.603, arrêt n° 2097 FS-P, D. 2003.68, obs. A. Lienhard et 1473, obs. G. Taormina ; Com. 29 avr. 2003, Crouzet ès qualités c/ Sté Fina France , pourvoi n° Y 00-111.912, arrêt n° 684 FS-P+B, D. 2003.1364, obs. A. Lienhard ; CA Montpellier, 2e Ch. B, 20 avr. 2004, Payeur départemental des PyrénéesOrientales c/ Me Clément ès qualités)

Mobility of Cr and V in Spent Oil Shale: Impact of Thermal Treatment

2013

Abstract Spent oil shale samples were evaluated for potential chromium and vanadium release upon aerobic combustion used in power generation, or anaerobic retorting used in shale oil recovery. Combusted samples released more Cr than retorted or raw samples due to chromate formation. The behavior of vanadium was just opposite in that more V was released from retorted than from aerobically combusted samples, probably due to reduced vanadyl cation formation.

Backward frequency doubling of near infrared picosecond pulses.

2014

We report on backward second-harmonic generation using ps laser pulses in congruent lithium niobate with 3.2 µm periodic poling. Three resonant peaks were measured between 1530 and 1730 nm, corresponding to 16th, 17th and 18th quasi-phase-matching orders in the backward configuration, with a conversion efficiency of 4.75 x 10(-5%)/W for the 16th order. We could also discriminate the contributions from inverted domains randomized in duty-cycle.

Managing Group and Phase Birefringence for Nonlinear Optics in Photonic Crystal Fibers

2006

A novel design of birefringent photonic crystal fibers with stress applying parts permits to manage the wavelength dependence of group and phase birefringence. Applications to vector frequency conversion and soliton polarization instabilities are discussed.

Ultraviolet generation in periodically poled Lithium Tantalate waveguides

2008

We demonstrate ultraviolet generation in lithium tantalate channel waveguides for frequency doubling via quasi-phase-matching. The samples, proton exchanged and nanostructured by electric-field assisted surface periodic poling with domains as deep as 40 μm, yield continuous wave light at 365.4 nm with conversion efficiencies larger than 7.5% W-1 cm-2.