Journal ArticleDOI
The GREAT spectrometer
Robert Page,Andrei Andreyev,D. E. Appelbe,P. A. Butler,S. J. Freeman,Paul Greenlees,R-D Herzberg,D. G. Jenkins,G. D. Jones,P.M. Jones,D. T. Joss,Rauno Julin,Heikki Kettunen,M. Leino,Panu Rahkila,P. H. Regan,J. Simpson,Juha Uusitalo,SM Vincent,R. Wadsworth +19 more
TLDR
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.read more
Citations
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Journal ArticleDOI
Radioactive decays at limits of nuclear stability
TL;DR: A review of the decay modes occurring close to the limits of stability is presented in this paper, where the experimental methods used to produce, identify, and detect new species and their radiation are discussed.
Journal ArticleDOI
In-beam and decay spectroscopy of transfermium nuclei
R.-D. Herzberg,Paul Greenlees +1 more
TL;DR: In this paper, a review of the available experimental data on nuclei between Cm (Z = 96 ) and Db ( Z = 105 ) is presented, focusing on those datasets obtained most recently.
Journal ArticleDOI
Nuclear isomers in superheavy elements as stepping stones towards the island of stability
R-D Herzberg,Paul Greenlees,P. A. Butler,G. D. Jones,M. Venhart,Iain Darby,S. Eeckhaudt,K. J. Eskola,T. Grahn,C. Gray-Jones,F. P. Hessberger,P.M. Jones,R. Julin,S. Juutinen,Steffen Ketelhut,W. Korten,Matti Leino,A.-P. Leppänen,S. Moon,M. Nyman,Robert Page,Janne Pakarinen,Janne Pakarinen,A. Pritchard,P. Rahkila,Jan Sarén,C. Scholey,A. Steer,Y. Sun,Ch. Theisen,Juha Uusitalo +30 more
TL;DR: A study of the nobelium isotope 254No, with 102 protons and 152 neutrons, finds three excited structures, two of which are isomeric (metastable) and one of these structures is firmly assigned to a two-proton excitation, which provide a microscopic benchmark for nuclear models of the superheavy elements.
Journal ArticleDOI
Developing the Recoil Distance Doppler-Shift technique towards a versatile tool for lifetime measurements of excited nuclear states
A. Dewald,O. Möller,P. Petkov +2 more
TL;DR: In this paper, the Recoil Distance Doppler Shift (RDDS) method is used in nuclear structure physics to determine level lifetimes and absolute transition probabilities, and the concept of differential plunger is discussed with respect to its specific features and typical experimental setups.
Journal ArticleDOI
Grain—A Java data analysis system for Total Data Readout
TL;DR: Grain is a data analysis system developed to be used with the novel Total Data Readout data acquisition system and the accompanying software system have been written entirely in Java.
References
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Journal ArticleDOI
Gas-filled recoil separator for studies of heavy elements
Matti Leino,Juha Äystö,T. Enqvist,P. Heikkinen,Ari Jokinen,M. Nurmia,A Ostrowski,Wladyslaw Henryk Trzaska,Juha Uusitalo,K. Eskola,P. Armbruster,V. Ninov +11 more
TL;DR: A gas-filled recoil separator for the study of heavy elements has been constructed in this article, which is of type QDQQ with the first, vertically focusing, quadrupole providing improved matching to the acceptance of the dipole magnet.
Journal ArticleDOI
In-beam gamma -ray spectroscopy above 100Sn using the new technique of recoil decay tagging
E. S. Paul,Philip Woods,Thomas Davinson,R. D. Page,Paul J. Sellin,C. W. Beausang,R. M. Clark,R.A. Cunningham,S. A. Forbes,D. B. Fossan,A. Gizon,J. Gizon,K. Hauschild,I. M. Hibbert,A.N. James,D. R. LaFosse,I.H. Lazarus,H. Schnare,Jayne Simpson,R. Wadsworth,M. P. Waring +20 more
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.
Journal ArticleDOI
The GREAT triggerless total data readout method
I. Lazarus,D. E. Appelbe,P. A. Butler,P. J. Coleman-Smith,J.R. Cresswell,S. J. Freeman,R.-D. Herzberg,I. M. Hibbert,D. T. Joss,S. C. Letts,Robert Page,V. F. E. Pucknell,P. H. Regan,J.A. Sampson,J. Simpson,J. Thornhill,R. Wadsworth +16 more
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.
Journal ArticleDOI
Fine structure in 192 Po α-decay and shape coexistence in 188 Pb
R. G. Allatt,R. D. Page,Matti Leino,T. Enqvist,K. J. Eskola,Paul Greenlees,Peter M. Jones,R. Julin,Pasi Kuusiniemi,Wladyslaw Henryk Trzaska,Juha Uusitalo +10 more
TL;DR: In this paper, a level scheme has been fitted using a configuration mixing calculation, providing estimates of the mixing matrix elements, mixing amplitudes and the energies of unperturbed and unobserved levels.
Journal ArticleDOI
A modular amplifier system for the readout of silicon strip detectors
TL;DR: In this paper, a modular system of 250 preamplifiers and shaping amplifiers is built to read out an array of silicon strip detectors, which form a telescope which is used to study the breakup reactions of heavy ions in vacuum.