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Featured researches published by J. Äystö.


Reports on Progress in Physics | 2009

Physics at a future Neutrino Factory and super-beam facility

A. Bandyopadhyay; S. Choubey; Raj Gandhi; Srubabati Goswami; B.L. Roberts; J. Bouchez; I. Antoniadis; John Ellis; Gian Francesco Giudice; Thomas Schwetz; S. Umasankar; G. Karagiorgi; A. A. Aguilar-Arevalo; J. M. Conrad; M. H. Shaevitz; Silvia Pascoli; S. Geer; J.E. Campagne; Mark Rolinec; A. Blondel; M. Campanelli; Joachim Kopp; Manfred Lindner; Juha T. Peltoniemi; P.J. Dornan; K. R. Long; T. Matsushita; C. Rogers; Y. Uchida; M. Dracos

The conclusions of the Physics Working Group of the International Scoping Study of a future Neutrino Factory and super-beam facility (the ISS) are presented. The ISS was carried out by the international community between NuFact05, (the 7th International Workshop on Neutrino Factories and Super-beams, Laboratori Nazionali di Frascati, Rome, 21–26 June 2005) and NuFact06 (Ivine, CA, 24–30 August 2006). The physics case for an extensive experimental programme to understand the properties of the neutrino is presented and the role of high-precision measurements of neutrino oscillations within this programme is discussed in detail. The performance of second-generation super-beam experiments, beta-beam facilities and the Neutrino Factory are evaluated and a quantitative comparison of the discovery potential of the three classes of facility is presented. High-precision studies of the properties of the muon are complementary to the study of neutrino oscillations. The Neutrino Factory has the potential to provide extremely intense muon beams and the physics potential of such beams is discussed in the final section of the report.The conclusions of the Physics Working Group of the International Scoping Study of a future Neutrino Factory and super-beam facility (the ISS) are presented. The ISS was carried out by the international community between NuFact05, (the 7th International Workshop on Neutrino Factories and Superbeams, Laboratori Nazionali di Frascati, Rome, June 21-26, 2005) and NuFact06 (Irvine, California, 2430 August 2006). The physics case for an extensive experimental programme to understand the properties of the neutrino is presented and the role of high-precision measurements of neutrino oscillations within this programme is discussed in detail. The performance of second generation super-beam experiments, beta-beam facilities, and the Neutrino Factory are evaluated and a quantitative comparison of the discovery potential of the three classes of facility is presented. High-precision studies of the properties of the muon are complementary to the study of neutrino oscillations. The Neutrino Factory has the potential to provide extremely intense muon beams and the physics potential of such beams is discussed in the final section of the report. The ISS Physics Working Group Editors: S.F. King1, K. Long2, Y. Nagashima3, B.L. Roberts4, and O. Yasuda5.


Nuclear Physics | 2001

Development and applications of the IGISOL technique

J. Äystö

Abstract The development and present status of the Ion Guide Isotope Separator On-Line technique is presented. Applications to nuclear physics research include decay spectroscopy of proton- and neutron-rich nuclei of refractory elements and studies of their ground-state properties by collinear laser spectroscopy. Future developments, including ion-beam manipulations by linear RFQ and Penning traps, are discussed together with high-energy applications of the IGISOL technique.


Journal of Cosmology and Astroparticle Physics | 2007

Large underground, liquid based detectors for astro-particle physics in Europe: Scientific case and prospects

D. Autiero; J. Äystö; A Badertscher; Leonid B. Bezrukov; J. Bouchez; A. Bueno; J. Busto; J.E. Campagne; C. H. Cavata; L. Chaussard; A. de Bellefon; Y. Declais; J. Dumarchez; J. Ebert; T. Enqvist; A. Ereditato; F. von Feilitzsch; P. F. Perez; M. Goger-Neff; S.N. Gninenko; W. Gruber; C. Hagner; M. Hess; Kathrin A. Hochmuth; J. Kisiel; L. Knecht; I. Kreslo; V.A. Kudryavtsev; P. Kuusiniemi; T. Lachenmaier

This document reports on a series of experimental and theoretical studies conducted to assess the astro-particle physics potential of three future large scale particle detectors proposed in Europe as next generation underground observatories. The proposed apparatuses employ three different and, to some extent, complementary detection techniques: GLACIER (liquid argon TPC), LENA (liquid scintillator) and MEMPHYS (water Cherenkov), based on the use of large mass of liquids as active detection media. The results of these studies are presented along with a critical discussion of the performance attainable by the three proposed approaches coupled to existing or planned underground laboratories, in relation to open and outstanding physics issues such as the search for matter instability, the detection of astrophysical neutrinos and geo-neutrinos and to the possible use of these detectors in future high intensity neutrino beams.


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2001

Beam cooler for low-energy radioactive ions

A. Nieminen; J. Huikari; A. Jokinen; J. Äystö; P. Campbell; E. C. A. Cochrane

An ion beam cooler for mass-separated radioactive ion beams has been developed and tested at the IGISOL-type mass separator facility. Technical description and characteristic properties are presented. An energy spread below 1 eV and transmission e


Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 1995

Gas-filled recoil separator for studies of heavy elements☆

M. Leino; J. Äystö; T. Enqvist; Pauli Heikkinen; A. Jokinen; M. Nurmia; A Ostrowski; Wladyslaw Henryk Trzaska; J. Uusitalo; Kari J. Eskola; P Armbruster; V Ninov

ciency of 60% were measured. 2001 Elsevier Science B.V. All rights reserved.


Hyperfine Interactions | 2000

The REX-ISOLDE project

D. Habs; O. Kester; T. Sieber; H. Bongers; S. Emhofer; P. Reiter; P. G. Thirolf; G. Bollen; J. Äystö; O. Forstner; H.L. Ravn; T. Nilsson; M. Oinonen; H. Simon; J. Cederkall; F. Ames; P. Schmidt; G. Huber; L. Liljeby; O. Skeppstedt; Karl-Gunnar Rensfelt; F. Wenander; B. Jonson; G. Nyman; R. von Hahn; H. Podlech; R. Repnow; Ch. Gund; D. Schwalm; A. Schempp

Abstract A gas-filled recoil separator for the study of heavy elements has been constructed. The separator is of type QDQQ with the first, vertically focusing, quadrupole providing improved matching to the acceptance of the dipole magnet. The separator has been designed also for use in vacuum mode in which case a mass resolving power of ≈ 100 is estimated. The deflection angle is 25° and the radius of curvature is 1850 mm. Maximum beam rigidity is 2.2 T m. In the first experiments, new isotopes in the region Z = 85–90 have been synthesized.


Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 2003

Accelerated radioactive beams from REX-ISOLDE

O. Kester; T. Sieber; S. Emhofer; F. Ames; K. Reisinger; P. Reiter; P. G. Thirolf; R. Lutter; D. Habs; B. H. Wolf; G. Huber; P. Schmidt; A. N. Ostrowski; R. von Hahn; R. Repnow; J. Fitting; M. Lauer; H. Scheit; D. Schwalm; H. Podlech; A. Schempp; U. Ratzinger; O. Forstner; F. Wenander; Joakim Cederkäll; T. Nilsson; M. Lindroos; H. O. U. Fynbo; S. Franchoo; U. C. Bergmann

The Radioactive Beam Experiment REX-ISOLDE [1–3] is a pilot experiment at ISOLDE (CERN) testing the new concept of post acceleration of radioactive ion beams by using charge breeding of the ions in a high charge state ion source and the efficient acceleration of the highly charged ions in a short LINAC using modern ion accelerator structures. In order to prepare the ions for the experiments singly charged radioactive ions from the on-line mass separator ISOLDE will be cooled and bunched in a Penning trap, charge bred in an electron beam ion source (EBIS) and finally accelerated in the LINAC. The LINAC consists of a radiofrequency quadrupole (RFQ) accelerator, which accelerates the ions up to 0.3 MeV/u, an interdigital H-type (IH) structure with a final energy between 1.1 and 1.2 MeV/u and three seven gap resonators, which allow the variation of the final energy. With an energy of the radioactive beams between 0.8 MeV/u and 2.2 MeV/u a wide range of experiments in the field of nuclear spectroscopy, astrophysics and solid state physics will be addressed by REX-ISOLDE.


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1986

The ion guide isotope separator on-line, IGISOL

J. Ärje; J. Äystö; H. Hyvönen; P. Taskinen; V. Koponen; J. Honkanen; K. Valli; A. Hautojärvi; K. Vierinen

In 2001 the linear accelerator of the Radioactive beam EXperiment (REX-ISOLDE) delivered for the first time accelerated radioactive ion beams, at a beam energy of 2 MeV/u. REX-ISOLDE uses the method of charge-state breeding, in order to enhance the charge state of the ions before injection into the LINAC. Radioactive singly-charged ions from the on-line mass separator ISOLDE are first accumulated in a Penning trap, then charge bred to an A/q < 4.5 in an electron beam ion source (EBIS) and finally accelerated in a LINAC from 5 keV/u to energies between 0.8 and 2.2 MeV/u. Dedicated measurements with REXTRAP, the transfer line and the EBIS have been carried out in conjunction with the first commissioning of the accelerator. Thus the properties of the different elements could be determined for further optimization of the system. In two test beam times in 2001 stable and radioactive Na isotopes (Na-23-Na-26) have been accelerated and transmitted to a preliminary target station. There Ni-58- and Be-9- and H-2-targets have been used to study exited states via Coulomb excitation and neutron transfer reactions. One MINIBALL triple cluster detector was used together with a double sided silicon strip detector to detect scattered particles in coincidence with gamma-rays. The aim was to study the operation of the detector under realistic conditions with gamma-background from the beta-decay of the radioactive ions and from the cavities. Recently for efficient detection eight tripple Ge-detectors of MINIBALL and a double sided silicon strip detector have been installed. We will present the first results obtained in the commissioning experiments and will give an overview of realistic beam parameters for future experiments to be started in the spring 2002.


Nuclear Physics | 1998

Beta decay of 31Ar

L. Axelsson; J. Äystö; María José García Borge; L. M. Fraile; H. O. U. Fynbo; A. Honkanen; P. Hornshøj; A. Jokinen; B. Jonson; P. O. Lipas; I. Martel; I. Mukha; T. Nilsson; G. Nyman; B. Petersen; K. Riisager; M. H. Smedberg; Olof Tengblad

Abstract A new ISOL method, the IGISOL (Ion Guide Isotope Separator On-Line), permits thermalized primary recoil ions produced in nuclear reactions to be run directly through a mass separator without a conventional ion source. It allows a fast (≳ 100 μs) separation of various radioactive isotopes of both volatile and nonvolatile elements. The overall separation efficiencies measured for heavy nuclides produced in light ion induced reactions are up to 10%. The shortest-lived activity identified in an on-line separation is the 182 μs isomeric state of 207Bi.


Journal of Physics G | 2012

High-accuracy mass spectrometry of fission products with Penning traps

A. Kankainen; J. Äystö; A. Jokinen

Abstract A complete study of 31 Ar beta decay has been made by high-resolution charged-particle and gamma-ray spectroscopy. Beta-delayed radiation was detected by an array of three charged-particle detectors and a large-volume germanium detector. Fifteen new energy levels were discovered in 31 Cl. The beta-strength distribution, measured to 14.5 MeV, is compared with a shell-model calculation in the full sd space. The quenching of the Gamow-Teller strength and the isospin impurity of the IAS in 31 Cl are discussed.

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A. Nieminen

University of Jyväskylä

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M. Oinonen

University of Helsinki

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J. Huikari

University of Jyväskylä

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T. Nilsson

Chalmers University of Technology

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P. Dendooven

University of Jyväskylä

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S. Rinta-Antila

University of Jyväskylä

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H. Penttilä

University of Jyväskylä

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