[en] CRYRING, which was proposed in October 1983, aims at a facility for performing experimental atomic, molecular and nuclear structure physics using very heavy, highly charged ions. In particular the possibility to study the interaction between a circulating heavy ion beam (proportional(1-5).10⁹ ions) and beams of ions, electrons or photons is foreseen. An extracted beam (10 Hz, 30% duty cycle, proportional(1-5) pnA) with an energy around or slightly above the Coulomb barrier will allow experiments in atomic and nuclear structure physics. (orig.)

[en] The CRYRING project was put forward by the Research Institute of Physics (AFI), Stockholm, Sweden, as a proposal in October 1983 under the heading A facility with CRYSIS and other ion sources connected to a synchrotron ring intended for studies of atomic, molecular and nuclear collisions, in particular in experiments with interacting beams of ions, molecules, electrons and laser photons. In September 1985 funding was granted for the last subproject, comprising the actual ring structure to be completed by 1989-90. Thus started the third Swedish storage ring project, the first being the synchrotron radiation electron ring MAX at Lund and the second the nuclear and particle physics light ion ring CELSIUS at Uppsala. The present short contribution aims at a pedagogical (though necessarily somewhat superficial) presentation of CRYRING and its modes of operation. 21 references, 5 figures

[en] A synchrotron-storage ring for very highly charged heavy ions is under construction at the Research Institute of Physics in Stockholm. A short technical description of the ring and its injector is given. (orig.)

[en] Using the ²⁰⁴Hg(α, pn)-reaction and α-particles of energies 39-55 MeV, we have found an isomeric 3.6 min 12^- state in ²⁰⁶Tl at 2,642.9 keV. The 12^- state decays mainly by an E5 transition of energy 1,021.4 keV to a 7⁺ state at 1,621.5 keV. There is, in addition, evidence for a weak 565 keV M4 branch to an 8⁺ state at 2,078 keV. The 7⁺ state decays by a stretched cascade of γ-rays to states of the following values of Jsub(π) and excitation energy: 5+, 1,405.4 keV; 4-, 952.1 keV; 2-, 265.8 keV and 0-, 0 keV. From the nuclear masses of ²⁰⁸Pb, ²⁰⁷Pb, ²⁰⁷Tl, and ²⁰⁶Tl and the experimental excitation energies it is possible to obtain the proton hole - neutron hole interaction in ²⁰⁶Tl. This interaction is compared with the calculations of Kuo and Herling and the discrepancies are discussed. (orig./BJ)

No abstract available

[en] The status of the CRYRING project is reviewed. Parameters for the main rings, magnets, acceleration system, and the electron cooler are given

[en] This paper reports on CRYRING a project aiming at a facility for research in atomic, molecular and nuclear physics using a cryogenic electron-beam ion source CRYSIS together with an RFQ linear accelerator as injector into a synchrotron-storage ring for very highly charged, heavy ions. (CRYSIS stands for Cryogenic Stockholm Ion Source and CRYRING for Crysis-Synchrotron-Storage-Ring). The lay-out of a first phase of the planned facility is presented. At the ring research programs on photon-ion, electron-ion and atom/ion-ion interactions will be possible over a wide range of relative energies and particle species. The quality of the beam of circulating ions will be improved by electron cooling. In a second phase CRYRING will be equipped with a high-voltage (around 300 kV) ion accelerator as an alternative injection but also as the second source needed for atom/ion-ion collision experiments. An extracted beam is also planned for this phase

[en] Using α-particles in the energy range 42-51 MeV, the ²⁰⁹Bi(α,4n)²⁰⁹At reaction was studied with the intention of investigating the properties of excited high spin states in ²⁰⁹At. In-beam prompt and delayed gamma-ray and conversion electron spectroscopy reveal two isomeric states at 2,429 and 1,428 keV having the half-lives of 875 +- 100 ns and 25 +- 1 ns, respectively. The spins and parities of these states are found to be 29/2⁺ and 21/2^-, respectively. The g-factors of the isomeric states are 1.06 +- 0.02 and 0.88 +- 0.06, which, within the experimental errors, are the same as the g-factors of the corresponding states in ²¹¹At. This suggests that the isomeric states are due to the π(h²sub(9/2))sub(8⁺)isub(13/2)ν(j^-2)sub(0⁺) and π(h³sub(9/2))ν(j^-2)sub(0⁺) configurations, respectively. The deviation between the calculated and experimentally found excitation energies of the isomeric levels are -146 +- 26 and +72 +- 26 keV. This deviation which in cases of a ²⁰⁸Pb-core usually is smaller than 15 keV, is likely to be due to the neglect of the interaction between two particles via the exchange of virtual 2⁺ phonons in the ²⁰⁶Pb core. This two-particle polarization interaction is found to be approximately described by a P₂-force. (orig.)

[en] CRYRING is a facility for research in atomic, molecular and nuclear physics using a cryogenic electron beam ion source, CRYSIS, together with a RFQ linear accelerator as injector into a synchrotron ring, which can be used both for acceleration, deceleration and storage of very highly charged, heavy ions. (CRYRING stands for CRYsis-synchrotron-RING, RFQ for Radio Frequency Quadrupole and CRYSIS for CRYogenic Stockholm Ion Source.) A lay-out of CRYRING in an available laboratory area is shown. In the ring itself experiments with a circulating heavy ion beam and merged or crossed beams of electrons, laser-photons, neutrals and ions will be possible. Crossed ion beams will be available from a 400 kV accelerator. Injectors for negative (hydrogen) ions and electrons (intended for cooling as well as experiments) are included in the project. Regarding the extraction of accelerated heavy ions for nuclear and atomic spectroscopy, it should be emphasized that the project aims at very heavy ions (Xe-U) which will be energetic enough to overcome the Coulomb barrier of heavy target nuclei. The different injectors can be separately used for experiments when not in operation for CRYRING. It should also be emphasized that since CRYSIS is a pulsed ion source, beam-sharing will be simplified, making it possible to run two or perhaps even three different experiments simultaneously

[en] CRYRING (Sweden) is an accelerator facility (synchrotron/storage ring) dedicated to low-energy research mainly using highly charged, heavy ions. The features of the main UHV components in the accelerator/storage ring of CRYRING are described. Using ion-pumps and NEG-pump modules, but without baking, a vacuum in the low 10^-11 mbar region has been achieved in the 52 m circumference ring. Following some modifications, it is expected that the design value, the low 10^-12 mbar region, will be reached. (R.P.) 7 refs.; 6 figs.; 1 tab