21 results on '"*DECAY schemes (Radioactivity)"'
Search Results
2. Evaluation of the 125Sb nuclear decay data.
- Author
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Lile, Liu, Xiaolong, Huang, Mengxiao, Kang, Guochang, Chen, Jimin, Wang, and Liyang, Jiang
- Subjects
- *
RADIOACTIVE decay , *INTERNAL conversion (Nuclear physics) , *DECAY schemes (Radioactivity) , *GAMMA rays , *DATA analysis - Abstract
Evaluation of the complete decay scheme and data for 125 Sb/ 125m Te decay to nuclear levels in 125 Te is presented in this report; literature data available up to June 2015 are included. The Limitation of Relative Statistical Weight Method (LRSW) was applied to average numbers throughout the evaluation. The uncertainty assigned to the average value was always greater than or equal to the smallest uncertainty of the values used to calculate the average. The half-life has been determined to be 1007.4±0.3 days. All known measured γ-ray absolute or relative intensities have been examined; the γ-ray emission probability of the reference γ-ray line of 427.874 keV is recommended to be 29.54±0.10%. The theoretical internal conversion coefficients and their uncertainties were used to obtain the complete decay scheme intensity balance. The values of other decay characteristics were calculated using the ENSDF analysis program. Finally the updated decay scheme for 125 Sb is presented. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
3. Nuclear physics studies using high energy lasers
- Author
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Gobet, F., Plaisir, C., Hannachi, F., Tarisien, M., Bonnet, T., Versteegen, M., Aléonard, M.M., Gosselin, G., Méot, V., and Morel, P.
- Subjects
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LASER plasmas , *NUCLEAR physics , *ENERGY levels (Quantum mechanics) , *NUCLEAR excitation , *THERMODYNAMIC equilibrium , *NUCLEAR isomers , *DECAY schemes (Radioactivity) , *RADIATIVE transitions - Abstract
Abstract: This paper presents several mechanisms expected to be responsible for nuclear excitation in laser-heated plasma. Attempts to detect such processes in nuclei initially in their ground state are discussed in 181Ta and 235U cases. A calculation of the nuclear excitation by electronic transition (NEET) rate is presented in a 201Hg plasma at local thermodynamic equilibrium. We also report on a new way of de-exciting isomeric states in plasma. This indirect decay mode is illustrated in the case of the 84Rb isomer nucleus. [Copyright &y& Elsevier]
- Published
- 2011
- Full Text
- View/download PDF
4. GPUs for fast pattern matching in the RICH of the NA62 experiment
- Author
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Lamanna, Gianluca, Collazuol, Gianmaria, and Sozzi, Marco
- Subjects
- *
GRAPHICS processing units , *PATTERN recognition systems , *CHERENKOV counters , *PHYSICS experiments , *DECAY schemes (Radioactivity) , *ACQUISITION of data - Abstract
Abstract: In rare decays experiments an effective online selection is a fundamental part of the data acquisition system (DAQ) in order to reduce both the quantity of data written on tape and the bandwidth requirements for the DAQ system. A multilevel architecture is commonly used to achieve a higher reduction factor, exploiting dedicated custom hardware and flexible software in standard computers. In this paper we discuss the possibility to use commercial video card processors (GPU) to build a fast and effective trigger system, both at hardware and software level. The computing power of the GPUs allows to design a real-time system in which trigger decisions are taken directly in the video processor with a defined maximum latency. This allows building lowest trigger levels based on standard off-the-shelf PCs with CPU and GPU (instead of the commonly adopted solutions based on custom electronics with FPGA or ASICs) with enhanced and high performance computation capabilities, resulting in high rejection power, high efficiency and simpler low level triggers. The ongoing work presented here shows the results achieved in the case of fast pattern matching in the RICH detector of the NA62 at CERN, aiming at measuring the Branching Ratio of the ultra rare decay , is considered as use case, although the versatility and the customizability of this approach easily allow exporting the concept to different contexts. In particular the application is related to particle identification in the RICH detector of the NA62 experiment, where the rate of events to be analyzed will be around 10MHz. The results obtained in lab tests are very encouraging to go towards a working prototype. Due to the use of off-the-shelf technology, in continuous development for other purposes (Video Games, image editing,…), the architecture described would be easily exported into other experiments, for building powerful, flexible and fully customizable trigger systems. [Copyright &y& Elsevier]
- Published
- 2011
- Full Text
- View/download PDF
5. Magnetic distortion calibration for LHCb RICH detectors
- Author
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Xíng, Fúnaì
- Subjects
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LARGE Hadron Collider , *CALIBRATION , *CHERENKOV counters , *CP violation , *DECAY schemes (Radioactivity) , *MAGNETIC dipoles - Abstract
Abstract: The LHCb experiment will search for new physics in CP violation and rare decays from heavy flavour production at the LHC. Particle identification is provided by two Ring Imaging Cherenkov (RICH) detectors, which incorporate a total of 484 Hybrid Photon Detectors (HPDs). The RICH detectors are located in the fringe field of the LHCb dipole magnet and fields as large as 2.5mT have been measured in some regions occupied by the RICH 1 photodetectors. It is necessary to make corrections for the distortion of the ring-images measured by the HPDs. RICH 1 incorporates a magnetic calibration system comprising a series of collimated LEDs mounted on x–y stages which scan over the front-faces of the HPD arrays. A similar system based on commercial projectors is used on RICH 2. The calibration is performed in dedicated runs with dipole field on and off. The calibration parameters are then stored in the Conditions Database and applied to the LHC collision data reconstruction. This report will present the improvement in Cherenkov angular resolutions with the magnetic calibration. [Copyright &y& Elsevier]
- Published
- 2011
- Full Text
- View/download PDF
6. Scintillation of thin tetraphenyl butadiene films under alpha particle excitation
- Author
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Pollmann, Tina, Boulay, Mark, and Kuźniak, Marcin
- Subjects
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SCINTILLATORS , *BUTADIENE , *ALPHA rays , *DARK matter , *THIN films , *DECAY schemes (Radioactivity) - Abstract
Abstract: The alpha induced scintillation of the wavelength shifter 1,1,4,4-tetraphenyl-1,3-butadiene (TPB) was studied to improve the understanding of possible surface alpha backgrounds in the DEAP dark matter search experiment. We found that vacuum deposited thin TPB films emit photons per MeV under alpha particle excitation. The scintillation pulse shape consists of a double exponential decay with lifetimes of and . [Copyright &y& Elsevier]
- Published
- 2011
- Full Text
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7. Computer controls for the WITCH experiment
- Author
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Tandecki, M., Beck, D., Beck, M., Brand, H., Breitenfeldt, M., De Leebeeck, V., Friedag, P., Herlert, A., Kozlov, V., Mader, J., Roccia, S., Soti, G., Traykov, E., Van Gorp, S., Wauters, F., Weinheimer, Ch., Zákoucký, D., and Severijns, N.
- Subjects
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AUTOMATION , *SPECTROMETERS , *PHYSICS experiments , *IONS , *DECAY schemes (Radioactivity) , *COMPUTER input-output equipment , *PENNING trap mass spectrometry - Abstract
Abstract: The WITCH experiment is a medium-scale experimental set-up located at ISOLDE/CERN. It combines a double Penning trap system with a retardation spectrometer for energy measurements of recoil ions from decay. For a correct operation of such a set-up a whole range of different devices is required. Along with the installation and optimization of the set-up a computer control system was developed to control these devices. The CS-Framework that is developed and maintained at GSI, was chosen as a basis for this control system as it is perfectly suited to handle the distributed nature of a control system.We report here on the required hardware for WITCH, along with the basis of this CS-Framework and the add-ons that were implemented for WITCH. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
8. A CMOS compatible Microbulk Micromegas-like detector using silicon oxide as spacer material
- Author
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Blanco Carballo, V.M., Fransen, M., van der Graaf, H., Lu, J., and Schmitz, J.
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GAS detectors , *COMPLEMENTARY metal oxide semiconductors , *SILICON oxide , *MIXTURES , *IRRADIATION , *TRANSISTORS , *DECAY schemes (Radioactivity) , *NUCLEAR counters - Abstract
Abstract: We present a new Micro Pattern Gaseous Detector (MPGD) fabricated with nonpolymeric materials. The device structure is similar to a Microbulk Micromegas design, consisting of a punctured metal grid supported by a continuous perforated insulating structure. In this detector, the supporting structure is made out of silicon oxide. Devices were tested in He/iC4H10 (80/20) and Ar/iC4H10 (80/20) gas mixtures under 55Fe irradiation. Gas gain of 20,000 and energy resolution below 13% FWHM were achieved. The CMOS compatibility of the fabrication process has been studied in Timepix chips as well as individual 0.13-μm technology CMOS transistors. Complete detectors have been fabricated on top of Timepix chips. In an Ar/iC4H10 (80/20) gas mixture 55Fe decay events were recorded operating the Timepix chip in 2D readout mode. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
9. GPUs for fast triggering and pattern matching at the CERN experiment NA62
- Author
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Lamanna, Gianluca, Collazuol, Gianmaria, and Sozzi, Marco
- Subjects
- *
BANDWIDTHS , *ACQUISITION of data , *GRAPHICS processing units , *PHYSICS experiments , *CHERENKOV counters , *BRANCHING ratios , *DECAY schemes (Radioactivity) , *PATTERN recognition systems - Abstract
Abstract: In rare decays experiments an effective trigger is crucial to reduce both the quantity of data written on tape and the bandwidth requirements for the DAQ (Data Acquisition) system. A multilevel architecture is commonly used to achieve a higher reduction factor, exploiting dedicated custom hardware and flexible software in standard computers. In this paper we discuss the possibility to use commercial video card processors (GPU) to build a fast and effective trigger system, both at hardware and software level. The case of fast pattern matching in the RICH detector of the NA62 experiment at CERN aiming at measuring the Branching Ratio of the ultra rare decay is considered as use case although the versatility and the customizability of this approach easily allow exporting the concept to different contexts. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
10. Performance of the liquid xenon detector for the MEG experiment
- Author
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Nishimura, Yasuhiro and Natori, Hiroaki
- Subjects
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XENON , *DETECTORS , *CALIBRATION , *PHOTONS , *PHYSICS experiments , *DECAY schemes (Radioactivity) , *SCINTILLATORS , *CP violation , *LEPTONS (Nuclear physics) , *FLAVOR in particle physics - Abstract
Abstract: A 900-l liquid xenon (LXe) detector was constructed for the MEG experiment to look for . With proper calibration and monitoring the detector was successfully operated during the first physics data taking for three months in 2008. We evaluated the performance of the LXe detector around the energy of 52.8MeV by using 54.9-MeV photons obtained from decays. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
11. The large-angle photon veto detector system for the NA62 experiment at CERN
- Author
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Valente, Paolo
- Subjects
- *
BRANCHING ratios , *DECAY schemes (Radioactivity) , *STANDARD model (Nuclear physics) , *CALORIMETERS , *CALIBRATION , *ELECTRON beams , *PHOTON detectors , *KAONS - Abstract
Abstract: The goal of the NA62 experiment is to collect about 80 events with a S/B ratio of . The branching ratio (BR) for this decay is and can be predicted in the Standard Model with minimal theoretical uncertainties, making it a sensitive probe for new physics. Measurement of this BR is challenging because of the background from dominant channels. To reduce background from decays (BR=21%) to an acceptable level, the must be detected with an inefficiency of less than 10−8. NA62 will make use of the existing NA48 beam-line and liquid-krypton calorimeter. A new photon veto system consisting of 12 rings placed along the vacuum volume is needed to detect large-angle photons (7–50mrad) with an inefficiency below 10−4 over the energy interval from a few hundred MeV to 35GeV. A comprehensive R&D program was carried out in 2007–2008 to compare different detector technologies, including the re-use of lead-glass blocks from the OPAL barrel calorimeter, ultimately demonstrating the feasibility of this approach. In 2009, a complete prototype of one veto ring was constructed, complete with front-end electronics to measure energies through time-over-threshold with a dynamic range of 1000, and an in situ calibration and monitoring system. The prototype was successfully tested with electron and muon beams at the CERN SPS in fall 2009. The status of the project and present preliminary results from the recent tests will be reviewed. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
12. The NA62 RICH detector
- Author
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Anzivino, Giuseppina
- Subjects
- *
CHERENKOV counters , *KINEMATICS , *PARTICLE beams , *GAS detectors , *STOPPING power (Nuclear physics) , *DECAY schemes (Radioactivity) - Abstract
Abstract: The NA62 experiment at CERN aims to measure the ultra-rare decay with a 10% accuracy; the main background, , is suppressed using kinematical cuts and exploiting the different stopping power of and . A further 0.5% suppression will be provided by a RICH detector, in a momentum range between 15 and 35GeV/c. In this paper the design parameters of a RICH detector that fulfills the NA62 experiment requirements will be described, as well as results from two different beam tests. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
13. Evaluation of the decay data of 109Cd
- Author
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Xiaolong, Huang, Shenggui, Yin, and Chunsheng, Deng
- Subjects
- *
CADMIUM , *DECAY schemes (Radioactivity) , *GAMMA rays , *ELECTRON capture , *INTERNAL conversion (Nuclear physics) , *EVALUATION - Abstract
Abstract: 109Cd decays to the excited states of 109Ag through the electron capture decay mode. The evaluation of the complete decay scheme and data of 109Cd including the recent new measurements is presented in this report. The limitation of relative statistical weight method (LRSW) was applied to average numbers throughout the evaluation. The uncertainty assigned to the average value was always greater than or equal to the smallest uncertainty of the values used to calculate the average. The half-life is determined to be 462.0±0.3 days. All known measured absolute emission probabilities for gamma-ray and KX-ray have been examined. And the gamma-ray emission probability of the reference γ line of 88.0336keV is recommended to be 3.65±0.3%. The internal conversion coefficients and their uncertainties were used to obtain the complete decay intensity balance. The other decay characteristics are calculated using the ENSDF analysis program. Finally the 109Cd decay scheme was given. [ABSTRACT FROM AUTHOR]
- Published
- 2010
- Full Text
- View/download PDF
14. Multipurpose High Sensitivity Radiation Detector: Terradex
- Author
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Alpat, Behcet, Aisa, Damiano, Bizzarri, Marco, Blasko, Sandor, Esposito, Gennaro, Farnesini, Lucio, Fiori, Emmanuel, Papi, Andrea, Postolache, Vasile, Renzi, Francesca, Ionica, Romeo, Manolescu, Florentina, Ozkorucuklu, Suat, Denizli, Haluk, Tapan, Ilhan, Ercan Pilicer, Egidi, Felice, Moretti, Cesare, and Dicola, Luca
- Subjects
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RADIATION measurements , *DETECTORS , *SCIENTIFIC apparatus & instruments , *DECAY schemes (Radioactivity) - Abstract
Abstract: Terradex project aims to realise an accurate and programmable multiparametric tool which will measure relevant physical quantities such as observation time, energy and type of all decay products of three naturally occurring decay chains of uranium and thorium series present in nature as well as the decay products of man-made radioactivity. The measurements described in this work are based on the performance tests of the first version of an instrument that is designed to provide high counting accuracy, by introducing self-triggering, delayed time-coincidence technique, of products of a given decay chain. In order to qualify the technique and to calibrate the Terradex, a 222Rn source is used. The continuous and accurate monitoring of radon concentration in air is realised by observing the alpha and beta particles produced by the decay of 222Rn and its daughters and tag each of them with a precise occurrence time. The validity of delayed coincident technique by using the state of the art electronics with application of novel data sampling and analysis methods are discussed. The flexibility of sampling protocols and the advantages of online calibration capability to achieve the highest level of precision in natural and man-made radiation measurements are also described. [Copyright &y& Elsevier]
- Published
- 2007
- Full Text
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15. Algorithms for the analysis of -decay total absorption spectra
- Author
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Tain, J.L. and Cano-Ott, D.
- Subjects
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ABSORPTION spectra , *ALGORITHMS , *ENTROPY , *DECAY schemes (Radioactivity) - Abstract
Abstract: The method of analysis of total absorption -ray spectra obtained in -decay measurements is studied. The analysis problem is reduced to the solution of a linear inverse problem. The performance and systematic uncertainties of different inverse algorithms are studied. The maximum entropy and the expectation-maximisation algorithms are found to be superior to the linear regularisation method. [Copyright &y& Elsevier]
- Published
- 2007
- Full Text
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16. The influence of the unknown de-excitation pattern in the analysis of -decay total absorption spectra
- Author
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Tain, J.L. and Cano-Ott, D.
- Subjects
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ABSORPTION spectra , *NUCLEAR excitation , *BRANCHING ratios , *DECAY schemes (Radioactivity) - Abstract
Abstract: The method of analysis of -decay total absorption spectra in order to obtain -strength distributions is studied. The influence on the final result of unknown branching ratios in the electromagnetic de-excitation of levels in the daughter nucleus is investigated with the help of the statistical model of the population and decay of the nucleus. The total decay strength appears to be rather insensitive to assumptions on the branching ratios and the systematic uncertainty on the shape of the strength distribution is quantified. [Copyright &y& Elsevier]
- Published
- 2007
- Full Text
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17. Effect of energy scale imperfections on results of neutrino mass measurements from <f>β</f>-decay
- Author
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Kašpar, J., Ryšavý, M., Špalek, A., and Dragoun, O.
- Subjects
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ELECTRON spectroscopy , *NUCLEAR physics instruments , *DECAY schemes (Radioactivity) , *CALIBRATION - Abstract
The effect of undetected imperfections of the energy scale on the results of electron spectroscopy experiment is studied for the conditions close to the tritium
β -decay experiment KATRIN (KATRIN Collaboration, 2001, arxiv: hep-ex/0109033). A numerical model of the experiment is developed, verified, and used to deduce general trends of fitted parameters. The effects of energy bias and of wrong slope of the calibration line are studied in more detail. [Copyright &y& Elsevier]- Published
- 2004
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18. Performances of a <f>BaF2</f> detector and its application to the search for <f>ββ</f> decay modes in <f>130Ba</f>
- Author
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Cerulli, R., Belli, P., Bernabei, R., Cappella, F., Nozzoli, F., Montecchia, F., d'Angelo, A., Incicchitti, A., Prosperi, D., and Dai, C.J.
- Subjects
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DECAY schemes (Radioactivity) , *NUCLEAR engineering instruments , *NUCLEAR reactors , *NUCLEAR counters - Abstract
The potentiality of the coincidence technique to search for
ββ decay processes in130Ba has been studied. ABaF2 crystal scintillator with a mass of3615 g and two low background NaI(Tl) detectors have been used for this purpose. The performances of theBaF2 detector in the used set-up have preliminarily been investigated, in particular: (i) theα/β light ratio, (ii) the pulse shape discrimination capability betweenα andβ particles, (iii) the main radioactive contaminations of the crystal. As a result, new limits (90% CL) on the lifetimes of the following double beta decay processes in130Ba have been determined:τ2β+0ν(0+→0+)>1.1×1017 y ,τ2β+0ν(0+→21+)>1.5×1017 y ,τECβ+0ν(0+→0+)>2.0×1017 y ,τECβ+0ν(0+→21+)>1.6×1017 y ,τECβ+0ν(0+→22+)>2.0×1017 y andτECβ+0ν(0+→4+)>1.1×1017 y . The new experimental limits obtained for the0ν(0+→0+) decay modes represent a significant improvement with respect to those previously available for this isotope, while those involving excited levels are set here for the first time. [Copyright &y& Elsevier]- Published
- 2004
- Full Text
- View/download PDF
19. The MEMPHYS project
- Author
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Borne, J.L., Busto, J., Campagne, J.-E., Dracos, M., Cavata, C., Dolbeau, J., Duchesneau, D., Dumarchez, J., Gorodetzky, P., Katsanevas, S., Longhin, A., Marafini, M., Mezzetto, M., Mosca, L., Tonazzo, A., Patzak, T., Vassilopoulos, N., Volpe, C., Zghiche, A., and Zito, M.
- Subjects
- *
CHERENKOV counters , *PHYSICS experiments , *NEUTRINOS , *DECAY schemes (Radioactivity) , *CP violation , *OPTOELECTRONIC devices , *ACQUISITION of data - Abstract
Abstract: MEMPHYS is a proposed 0.5Mton scale Water Cherenkov experiment to be performed deep underground. Possible sites are under study in the European FP7 design study LAGUNA. It is dedicated to nucleon decay, neutrinos from supernovæ, solar and atmospheric neutrinos, as well as neutrinos from a future Super-Beam or β-Beam to measure the mixing angle θ 13, the CP violating phase δ and the mass hierarchy. A small-scale prototype, Memphyno, has been constructed with the purpose of serving as a test bench for new photodetection and data acquisition solutions, such as grouped readout system. [Copyright &y& Elsevier]
- Published
- 2011
- Full Text
- View/download PDF
20. First results from the LHCb Vertex Locator
- Author
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Parkes, Chris
- Subjects
- *
VERTEX detectors , *LARGE Hadron Collider , *CHARM particles , *SILICON diodes , *DECAY schemes (Radioactivity) , *NUCLEAR power plant commissioning , *PHYSICS experiments - Abstract
Abstract: LHCb is a dedicated experiment to study new physics in the decays of beauty and charm hadrons at the Large Hadron Collider (LHC) at CERN. The Vertex Locator (VELO) is the silicon detector surrounding the interaction point and will be located only 7mm from the LHC beam during normal operation. The beauty and charm hadrons are identified through their flight distance in the VELO, and hence the detector is critical for both the trigger and offline physics analyses. The VELO has been commissioned and successfully operated during the initial running period of the LHC. The detector has been time aligned to the LHC beam, and spatially aligned. Preliminary operational results show a signal to noise ratio of 20:1, a cluster finding efficiency of 99.6%, and a best single hit precision of . [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
21. -Decay branching ratios measured by -ray tagging
- Author
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Bianco, L., Page, R.D., Joss, D.T., Simpson, J., Cederwall, B., Gómez Hornillos, M.B., Greenlees, P.T., Hadinia, B., Jakobsson, U., Jones, P.M., Julin, R., Ketelhut, S., Labiche, M., Leino, M., Nyman, M., Paul, E.S., Petri, M., Peura, P., Puurunen, A., and Rahkila, P.
- Subjects
- *
NUCLIDES , *SILICON diodes , *TARGETS (Nuclear physics) , *BRANCHING ratios , *DECAY schemes (Radioactivity) , *NUCLEAR reactions , *STATISTICAL correlation - Abstract
Abstract: The nuclides 168–170Pt were produced by bombarding isotopically enriched 92,94Mo targets with 336, 348MeV 78Kr ions. Prompt rays were detected at the target position and provided a selection criterion for the 168–170Pt nuclei. This technique enables the problem of the background from higher-energy decays in the spectrum to be circumvented. The Pt nuclei were separated in flight using the gas-filled separator RITU and implanted into the GREAT spectrometer, which was used to study subsequent decays. The -decay branching ratios of 164–166Os were deduced from the fraction of selected 168–170Pt nuclei correlated with decays of 164–166Os. The resulting branching ratios agree with the literature values but can have improved precision. [Copyright &y& Elsevier]
- Published
- 2008
- Full Text
- View/download PDF
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