共查询到20条相似文献,搜索用时 31 毫秒
1.
S. Schwarz G. Bollen M. Doleans O. Kester K. Kittimanapun M. Kostin A. Lapierre M. Portillo C. Wilson J. R. Crespo L��pez-Urrutia J. Dilling 《Hyperfine Interactions》2011,199(1-3):261-267
At the NSCL a reaccelerator with design end energy of 3 MeV/u for 238U, called ReA3, is approaching the end of construction. ReA3 will be coupled to a gas stopper at the NSCL fragmentation facility to provide rare-isotope beams of nuclides not available at ISOL facilities in this energy range. An Electron Beam Ion Trap (EBIT) will be used to provide highly charged ions at an energy of about 12 keV/u. The charge breeder is followed by a room-temperature radiofrequency quadrupole (RFQ) and a series of superconducting linear accelerator structures. Initial commissioning results from the EBIT and its charge-over-mass separator are presented. 相似文献
2.
In order to demonstrate a novel scheme to accelerate radioactive ions and to provide radioactive ion beams for physics experiments, the radioactive beam experiment (REX) was installed at ISOLDE, CERN. One of the main experimental devices that will use these beams is the newly commissioned HPGe array MINIBALL featuring an excellent granularity, energy resolution, and rate capability. First experiments have been performed using beams of neutron-rich Na and Mg isotopes.Received: 8 November 2002, Published online: 24 February 2004PACS:
41.75.Lx Other advanced accelerator concepts - 29.30.Kv X- and
-ray spectroscopy - 25.60.Je Transfer reactionsH. Scheit: For the REX-ISOLDE-MINIBALL Collaboration 相似文献
3.
G. Bisoffi 《The European physical journal. Special topics》2007,150(1):219-224
The accelerator group at INFN-LNL has been mostly engaged, recently, in completing and commissioning the
higher current injector of the linac booster ALPI (named PIAVE) and in constructing and assembling the front-end part of a
high current driver linac for the RNB facility SPES. PIAVE, designed to accelerate ions with A/Q = < 8.5 up to 1.2 MeV/u,
is now completed. The injector has been commissioned with O, Ar, Ne and Xe beams. Neon and argon beams have been delivered
to
experiments for a total of about 400 hours. A consolidation program of PIAVE and ALPI is planned, so as to deliver a larger
variety
of beams with a current range
pnA and with an energy exceeding the Coulomb barrier in relevant nuclear reaction cases.
The RNB facility SPES, allowing a frontier program in RNB physics, is being designed and prototyped: beams of neutron rich
medium-to-heavy mass nuclei will be produced inducing 238U fission with a 40 MeV 200μA proton beam impinging onto
a multi-slice direct target. A further development of ALPI will make it best suitable for the re-acceleration of radioactive
nuclear species, after charge breeding and isotope selection. 相似文献
4.
D. Habs O. Kester T. Sieber H. Bongers S. Emhofer P. Reiter P.G. Thirolf G. Bollen J. Aystö O. Forstner H. Ravn T. Nilsson M. Oinonen H. Simon J. Cederkall F. Ames P. Schmidt G. Huber L. Liljeby O. Skeppstedt K.G. Rensfelt F. Wenander B. Jonson G. Nyman R. von Hahn H. Podlech R. Repnow C. Gund D. Schwalm A. Schempp K.-U. Kühnel C. Welsch U. Ratzinger G. Walter A. Huck K. Kruglov M. Huyse P. Van den Bergh P. Van Duppen L. Weissman A.C. Shotter A.N. Ostrowski T. Davinson P.J. Woods J. Cub A. Richter G. Schrieder 《Hyperfine Interactions》2000,129(1-4):43-66
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.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
5.
G. A. Souliotis A. L. Keksis B. C. Stein M. Veselsky M. Jandel D. V. Shetty S. N. Soisson S. Wuenschel S. J. Yennello 《The European physical journal. Special topics》2007,150(1):325-327
Recent efforts to produce and separate neutron-rich rare
isotopes in peripheral collisions below the Fermi energy are
presented. The experiments have been performed at the Cyclotron
Institute of Texas A&M University employing beams from the K500
Superconducting Cyclotron. Two magnetic separators were used: the
MARS recoil separator and the Superconducting Solenoid Line (BigSol
Line). An enhanced production of neutron-rich nuclides in comparison
with high-energy fragmentation mechanisms has been observed and
attributed to the role of the N/Z and the nuclear periphery of the
target. From a practical viewpoint, these reactions below or around
the Fermi energy offer a novel way to access very neutron-rich rare
isotopes. The experience obtained in the production of rare isotope
beams (RIB) below the Fermi energy will be exploited in the ongoing
RIB upgrade of the Cyclotron Institute that will involve production,
stopping and reacceleration of rare isotopes. 相似文献
6.
U. Köster 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):255-263
For fifty years the isotope separation on-line (ISOL) technique has been used for the production of radioactive-ion beams
(RIBs). Thick-target ISOL facilities can provide very intense RIBs for a wide range of applications. The important design
parameters for an ISOL facility are efficiency, rapidity and selectivity of all steps of the separation process. To achieve
the anticipated beam intensities with the next-generation RIB facilities, the production rate in the ISOL target has to be
increased by orders of magnitude. This is only possible by adapting the projectile beam for optimum production cross-sections
and simultaneously minimizing the target heating due to the electronic stopping power of charged-particle projectiles. ISOL
beams of 75 different elements have been produced up to now and further beam development is under way to produce a still greater
variety of isotopes and to improve existing beams in intensity and purity.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: Ulli.Koster@cern.ch 相似文献
7.
A new atomic beam type polarized alkali ion source has been installed at the MP tandem accelerator in Heidelberg. By thermal evaporation and collimation Li and Na atomic beams are formed. Polarization is produced by optical pumping and a 4-pole Stern-Gerlach magnet which results in beams in a single Zeeman m-state. The population is shifted to any m-state by an adiabatic high frequency transition in a medium field (MFT). The purity of m-state population has been measured to be between 0.95 and 0.98, which results in nuclear polarization P > 0.9, s=z,zz. At the surface ionizer of the ion source beams of 15 to 65 A of positive ions have been extracted of optically pumped Li and Na ions, respectively. 相似文献
8.
F. Azaiez M. Belleguic D. Sohler M. Stanoiu Zs. Dombrádi O. Sorlin J. Timár F. Amorini D. Baiborodin A. Bauchet F. Becker C. Borcea C. Bourgeois Z. Dlouhy C. Donzaud J. Duprat D. Guillemaud-Mueller F. Ibrahim M.J. Lopez R. Lucas S.M. Lukyanov V. Maslov J. Mrazek C. Moore F. Nowacki B.M. Nyakó Yu.-E. Penionzhkevich M.G. Saint-Laurent F. Sarazin J.A. Scarpaci G. Sletten C. Stodel M. Taylor C. Theisen G. Voltolini 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):93-97
The structure of neutron-rich light nuclei around N = 20 and 28 has been investigated at GANIL by means of in-beam gamma-spectroscopy using fragmentation reactions of 36S and 48Ca beams on a Be target. Gamma-decay of relatively high-lying excited states have been measured for the first time in nuclei
around 32Mg and 44S. Level schemes are proposed and discussed for a large number of these neutron-rich nuclei around N = 20 and N = 28.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: azaiez@ipno.in2p3.fr 相似文献
9.
Eberhard Widmann 《Hyperfine Interactions》2014,229(1-3):123-128
The CRYRING accelerator, previously located at the Manne Siegbahn Laboratory of Stockholm University, has been chosen by the FLAIR collaboration as the central accelerator for the planned facility. It has been modified to allow for high-energy injection and extraction and is capable of providing fast and slow extracted beams of antiprotons and highly charged ions. It is currently being installed at the ESR of GSI Darmstadt where it can be used with highly charged ions. The future possibilities for its use with slow antiprotons will be discussed. 相似文献
10.
J.L. Durell 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):167-170
Our knowledge of the structure and spectroscopy of neutron-rich nuclei has greatly increased due to two important developments
in nuclear physics: the construction of large γ-ray arrays to investigate prompt γ-rays from fission and deep-inelastic reactions;
and the availability of radioactive nuclei from fragmentation and spallation reactions. In this review examples will be given
of the advances that have been made in our understanding of the properties of neutron-rich nuclei. The examples are necessarily
selective, given the limitations of space and time.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: nsd@mags.ph.man.ac.uk 相似文献
11.
It is emphasized that a coming accelerator complex should be designed by wide application of beam manipulation. On the basis of this opinion, conceptual designs of two kinds of accelerator complexes of a 30 GeV/nucleon uranium-ion collider and of an intense 30 GeV proton accelerator are studied independently of each other. Moreover, it is shown from these designs that an accelerator complex with accelerator parameters common to both is possibly designed with the help of good beam manuipulation if mutual concessions of beam parameters of heavy ions and of intense protons are accepted. The optimum accelerator complex consists of at least three synchrotrons and three dc rings. The expected beam performance is 450 MeV/nucleon and 30 GeV/nucleon for uranium ions as a typical example of heavy ions, and 150 A below 2.7 GeV and 10 A below 30 GeV for intense protons. 相似文献
12.
E. Roeckl 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):139-144
This review focusses on recent results obtained by using fusion-evaporation reactions for the production of N ≃ Z nuclei, the on-line mass separator of GSI for the preparation of the radioactive samples, and charged-particle and γ-ray
detectors for performing decay spectroscopy. The experimental results on prompt and β-delayed disintegration modes are discussed
in comparison with theoretical model predictions.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: e.roeckl@gsi.de 相似文献
13.
R. Julin P.T. Greenlees K. Helariutta P. Jones S. Juutinen A.-P. Leppänen H. Kankaanpää A. Keenan H. Kettunen P. Kuusiniemi M. Leino M. Muikku P. Nieminen J. Pakarinen P. Rahkila J. Uusitalo D.T. Joss S.J. Williams D.G. Jenkins N.-S. Kelsall R. Wadsworth K. Hauschild A. Hürstel W. Korten Y. Le Coz A.N. Andreyev P. Van Duppen M. Huyse K. Van de Vel C.J. Moore C.D. O'Leary R.D. Page M.J. Taylor W. Reviol M.B. Smith 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):189-193
The JYFL gas-filled recoil separator RITU, combined with Ge detector arrays and a SACRED magnetic solenoid spectrometer, has
been successfully employed in recoil-decay-tagging (RDT) experiments in order to probe structures of very neutron-deficient
heavy nuclei. The present contribution focuses on the light Pb region where the new data extend the systematics of shape-coexisting
yrast states towards the proton dripline. Similarities between band structures and their relation to possible multi-particle
multi-hole intruder excitations will be discussed.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: rauno.julin@phys.jyu.fi 相似文献
14.
P. Campbell A. Nieminen J. Billowes P. Dendooven K.T. Flanagan D.H. Forest Yu.P. Gangrsky J.A.R. Griffith J. Huikari A. Jokinen I.D. Moore R. Moore H.L. Thayer G. Tungate S.G. Zemlyanoi J. Äystö 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):45-48
A new RFQ ion-beam cooler and buncher, installed after the mass-separating magnet of the ion guide isotope separator, IGISOL,
JYFL, has dramatically increased the scope of on-line laser spectroscopy at this facility. The device, operated in a bunching
mode, has permitted new measurements on short-lived radionuclei in the Ti, Zr and Hf chains at a sensitivity two orders of
magnitude greater than that previously achieved. The device has also opened new prospects for laser-based nuclear spectroscopy
at the facility, particularly collinear resonance ionisation spectroscopy.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: pc@mags.ph.man.ac.uk 相似文献
15.
Y. Tai J. Murakami C. Majumder V. Kumar H. Mizuseki Y. Kawazoe 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2003,24(1-3):295-298
Fragmentation of germanium and tin cluster ions
in the low-energy
collisions with a Si surface has been investigated by means of a
tandem time-of-flight mass spectrometer. At low incident
energies, smaller clusters fragmented by an atom loss process,
whereas larger clusters decayed by fission. The favored
fragmentation paths for both cluster ions were similar to those
for Si cluster ions. The results support the structural
similarities among Si, Ge, and Sn clusters in the present size
range. For tin cluster ions, low-energy fragmentation patterns
were compared with those obtained from theoretical calculations
using generalized gradient approximation (GGA) and the B3PW91
exchange-correlation functional. It has been found that the
B3PW91 hybrid functional results are consistent with the
experimental observations. 相似文献
16.
R. Neugart 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):35-39
Lasers have played an important role for the development of new spectroscopy techniques yielding spins, electromagnetic moments
and charge radii of many unstable nuclei. More recently, similar techniques have been introduced to manipulate atoms and thus
to prepare beams or samples of radioactive atoms for various applications including nuclear spectroscopy and decay studies.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: rainer.neugart@uni-mainz.de 相似文献
17.
V. D. Kekelidze A. D. Kovalenko I. N. Meshkov A. S. Sorin G. V. Trubnikov 《Physics of Atomic Nuclei》2012,75(5):542-545
A new scientific program is proposed at the Joint Institute for Nuclear Research (JINR) in Dubna aimed at studies of hot and dense baryonic matter in the wide energy range from 2 GeV/u kinetic energy in fixed target experiments to $\sqrt {s_{NN} } = 4 - 11$ GeV/u in the collider mode. To realize this program the development of the JINR accelerator facility in high-energy physics (HEP) has been started. This facility is based on the existing superconducting synchrotron??the Nuclotron. The program foresees both experiments at the beams extracted from the Nuclotron, and the construction of a heavy-ion collider??the Nuclotron-based Ion Collider fAcility (NICA) which is designed to reach the required parameters with an average luminosity of L = 1027 cm?2 s?1. 相似文献
18.
19.
M. Stanoiu F. Azaiez F. Becker M. Belleguic C. Borcea C. Bourgeois B. A. Brown Z. Dlouhý Z. Dombrádi Z. Fülöp H. Grawe S. Grévy F. Ibrahim A. Kerek A. Krasznahorkay M. Lewitowicz S. Lukyanov H. van der Marel P. Mayet J. Mrázek S. Mandal D. Guillemaud-Mueller F. Negoita Y. E. Penionzhkevich Z. Podolyák P. Roussel-Chomaz M. G. Saint Laurent H. Savajols O. Sorlin G. Sletten D. Sohler J. Timár C. Timis A. Yamamoto 《The European Physical Journal A - Hadrons and Nuclei》2003,20(1):95-96
We have studied the structure of light neutron-rich nuclei around N = 16 by employing the in-beam
-ray spectroscopy technique using the fragmentation of secondary beams of 25,26Ne, 27,28Na and 29,30Mg isotopes. This secondary-beam cocktail was obtained by the fragmentation of a 36S beam at 77.5 MeV
by the SISSI/GANIL facility. By a second-step fragmentation, we have measured
-ray-residue coincidences in 17-20C and 23,24O and described the obtained levels in the framework of the shell model.Received: 31 October 2002, Published online: 24 February 2004PACS:
23.20.Lv
transitions and level energies - 21.60.Cs Shell model - 27.20. + n
- 27.30. + t
相似文献
20.
J.A. Nolen 《The European Physical Journal A - Hadrons and Nuclei》2002,13(1-2):255-261
There are several nuclear physics laboratories in North America that have on-going research using energetic and stopped radioactive
beams. These include the large ISOL-type programs ISAC at TRIUMF and HRIBF at Oak Ridge and the in-flight fragmentation program
at the NSCL of Michigan State University. There are also smaller, more specialized, programs using a variety of techniques
at the 88-inch cyclotron of Berkeley, ATLAS at Argonne, the Cyclotron Institute of Texas A&M University, the Nuclear Structure
Laboratory at Notre Dame University, and the Nuclear Structure Laboratory at SUNY/Stony Brook. There are also three projects
on the horizon in North America for new capabilities in both the near term and more distant future. The intensities of the
in-flight fragment beams at the NSCL will be increased dramatically very soon as the Coupled Cyclotron Project will be completed
and commissioned for research by mid-2001. A new project, ISAC-II, has been approved in Canada. For the longer term, the United
States is considering construction of a major new facility, the Rare Isotope Accelerator (RIA), which would have a very high-intensity
heavy-ion driver linac. The RIA facility is proposed to utilize both ISOL and in-flight production mechanisms.
Received: 1 May 2001 / Accepted: 4 December 2001 相似文献