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R. Wadsworth

Bio: R. Wadsworth is an academic researcher from University of York. The author has contributed to research in topics: Excited state & Neutron. The author has an hindex of 34, co-authored 454 publications receiving 6159 citations. Previous affiliations of R. Wadsworth include York University & Hungarian Academy of Sciences.


Papers
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Journal ArticleDOI
Serkan Akkoyun1, A. Algora2, B. Alikhani3, F. Ameil  +375 moreInstitutions (40)
TL;DR: The Advanced GAmma Tracking Array (AGATA) as discussed by the authors is a European project to develop and operate the next generation gamma-ray spectrometer, which is based on the technique of energy tracking in electrically segmented high-purity germanium crystals.
Abstract: The Advanced GAmma Tracking Array (AGATA) is a European project to develop and operate the next generation gamma-ray spectrometer. AGATA is based on the technique of gamma-ray energy tracking in electrically segmented high-purity germanium crystals. This technique requires the accurate determination of the energy, time and position of every interaction as a gamma ray deposits its energy within the detector volume. Reconstruction of the full interaction path results in a detector with very high efficiency and excellent spectral response. The realisation of gamma-ray tracking and AGATA is a result of many technical advances. These include the development of encapsulated highly segmented germanium detectors assembled in a triple cluster detector cryostat, an electronics system with fast digital sampling and a data acquisition system to process the data at a high rate. The full characterisation of the crystals was measured and compared with detector-response simulations. This enabled pulse-shape analysis algorithms, to extract energy, time and position, to be employed. In addition, tracking algorithms for event reconstruction were developed. The first phase of AGATA is now complete and operational in its first physics campaign. In the future AGATA will be moved between laboratories in Europe and operated in a series of campaigns to take advantage of the different beams and facilities available to maximise its science output. The paper reviews all the achievements made in the AGATA project including all the necessary infrastructure to operate and support the spectrometer.

351 citations

Journal ArticleDOI
TL;DR: The GREAT spectrometer as mentioned in this paper is designed to measure the decay properties of reaction products transported to the focal plane of a recoil separator, which can either be employed as a sensitive stand-alone device for decay measurements at the focal planes, or used to provide a selective tag for prompt conversion electrons or γ rays measured with arrays of detectors deployed at the target position.
Abstract: The GREAT spectrometer is designed to measure the decay properties of reaction products transported to the focal plane of a recoil separator. GREAT comprises a system of silicon, germanium and gas detectors optimised for detecting the arrival of the reaction products and correlating with any subsequent radioactive decay involving the emission of protons, α particles, β particles, γ rays, X-rays or conversion electrons. GREAT can either be employed as a sensitive stand-alone device for decay measurements at the focal plane, or used to provide a selective tag for prompt conversion electrons or γ rays measured with arrays of detectors deployed at the target position. A new concept of triggerless data acquisition (total data readout) has also been developed as part of the GREAT project, which circumvents the problems and limitations of common dead time in conventional data acquisition systems.

145 citations

Journal ArticleDOI
TL;DR: In this article, a novel method of selecting \ensuremath{\gamma}-ray transitions in heavy nuclei (Ag100) at the proton drip-line has been attempted.
Abstract: A novel method of selecting \ensuremath{\gamma}-ray transitions in heavy nuclei (Ag100) at the proton drip-line has been attempted. The characteristic charged-particle radioactivity of these nuclei (alpha decay, ground-state proton decay, and \ensuremath{\beta}-delayed proton emission) has been used to tag \ensuremath{\gamma}-ray transitions recorded by the highly efficient Eurogam spectrometer. The $^{58}\mathrm{Ni}$${+}^{54}$Fe and $^{58}\mathrm{Ni}$${+}^{58}$Ni fusion-evaporation reactions, at a beam energy of 240 MeV, have been used to populate specific states of these neutron-deficient nuclei and results are presented for $^{108,109}\mathrm{Te}$, $^{109}\mathrm{I}$, and $^{113}\mathrm{Xe}$, where \ensuremath{\gamma}-ray transitions have been identified. In the case of $^{109}\mathrm{I}$, this represents the first observation of \ensuremath{\gamma}-rays from a ground-state proton emitter.

136 citations

Journal ArticleDOI
01 Dec 2000
TL;DR: In this paper, a triggerless data acquisition method was proposed for the Gamma Recoil Electron Alpha Tagging (GREAT) spectrometer, where all channels run independently and are associated in software to reconstruct events.
Abstract: Recoil decay tagging (RDT) is a very powerful method for the spectroscopy of exotic nuclei. RDT is a delayed coincidence technique between detectors usually at the target position and at the focal plane of a spectrometer. Such measurements are often limited by dead time. This paper describes a novel triggerless data acquisition method, which is being developed for the Gamma Recoil Electron Alpha Tagging (GREAT) spectrometer, that overcomes this limitation by virtually eliminating dead time. Our solution is a total data readout (TDR) method where all channels run independently and are associated in software to reconstruct events. The TDR method allows all the data from both target position and focal plane to be collected with practically no dead-time losses. Each data word is associated with a timestamp generated from a global 100-MHz clock. Events are then reconstructed in real time in the event builder using temporal and spatial associations defined by the physics of the experiment.

129 citations

Journal ArticleDOI
N. Warr1, J. Van de Walle2, J. Van de Walle3, M. Albers1, F. Ames4, B. Bastin, C. Bauer5, V. Bildstein6, A. Blazhev1, S. Bönig5, N. Bree, B. Bruyneel1, P. A. Butler7, Joakim Cederkäll2, Joakim Cederkäll8, E. Clément2, Thomas Elias Cocolios2, Thomas Davinson9, H. De Witte, P. Delahaye2, Douglas D. DiJulio8, Jan Diriken, J. Eberth1, Andreas Ekström8, J. Elseviers, S. Emhofer4, D. V. Fedorov10, V. N. Fedosseev2, S. Franchoo2, C. Fransen1, Liam Gaffney7, J. Gerl, Georgi P. Georgiev11, R. Gernhäuser6, T. Grahn7, T. Grahn12, T. Grahn13, D. Habs4, H. Hess1, A. M. Hurst7, Mark Huyse, O. Ivanov, J. Iwanicki14, J. Iwanicki7, D. G. Jenkins15, D. G. Jenkins7, J. Jolie1, N. Kesteloot, Oliver Kester4, U. Köster2, M. Krauth, Th. Kröll6, Th. Kröll5, R. Krücken6, M. Lauer, J. Leske5, K. P. Lieb16, R. Lutter4, L. Maier6, B. A. Marsh2, D. Mücher6, D. Mücher1, M. Münch6, O. Niedermaier, Janne Pakarinen, M. Pantea5, Gheorghe Pascovici1, N. Patronis, D. Pauwels, A. Petts7, Norbert Pietralla5, Riccardo Raabe, E. Rapisarda2, P. Reiter1, Achim Richter5, O. Schaile4, Marcus Scheck7, Marcus Scheck5, Heiko Scheit5, G. Schrieder5, D. Schwalm, M. Seidlitz1, M. D. Seliverstov, T. Sieber2, Herbert A. Simon5, K.-H. Speidel17, C. Stahl5, I. Stefanescu18, P. G. Thirolf4, H.G. Thomas1, M. Thürauf5, P. Van Duppen, D. Voulot2, R. Wadsworth15, G. Walter, D. Weißhaar1, Fredrik Wenander2, Andreas Wiens1, Kathrin Wimmer6, B. H. Wolf4, Philip Woods9, K. Wrzosek-Lipska14, K. O. Zell1 
TL;DR: The Miniball germanium detector array has been operational at the REX (Radioactive ion beam EXperiment) post accelerator at the Isotope Separator On-Line facility ISOLDE at CERN since 2001.
Abstract: The Miniball germanium detector array has been operational at the REX (Radioactive ion beam EXperiment) post accelerator at the Isotope Separator On-Line facility ISOLDE at CERN since 2001. During the last decade, a series of successful Coulomb excitation and transfer reaction studies have been performed with this array, utilizing the unique and high-quality radioactive ion beams which are available at ISOLDE. In this article, an overview is given of the technical details of the full Miniball setup, including a description of the \(\gamma\)-ray and particle detectors, beam monitoring devices and methods to deal with beam contamination. The specific timing properties of the REX-ISOLDE facility are highlighted to indicate the sensitivity that can be achieved with the full Miniball setup. The article is finalized with a summary of some physics highlights at REX-ISOLDE and the utilization of the Miniball germanium detectors at other facilities.

128 citations


Cited by
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Journal ArticleDOI
01 Apr 1988-Nature
TL;DR: In this paper, a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) is presented.
Abstract: Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

9,929 citations

01 Jan 2005
TL;DR: The Monthly Notices as mentioned in this paper is one of the three largest general primary astronomical research publications in the world, published by the Royal Astronomical Society (RAE), and it is the most widely cited journal in astronomy.
Abstract: Monthly Notices is one of the three largest general primary astronomical research publications. It is an international journal, published by the Royal Astronomical Society. This article 1 describes its publication policy and practice.

2,091 citations

Journal ArticleDOI
TL;DR: In this article, the relativistic mean field theory for finite nuclei is reviewed and a field theoretical theory for pairing relations is presented and new results for realistic pairing interactions are discussed.

1,138 citations