skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: TRI{mu}P - a Radioactive-Atom Trapping Facility at KVI

Abstract

The TRI{mu}P facility, under construction at KVI, requires the production and separation of short-lived and rare isotopes. For this purpose, we have designed, constructed and commissioned a versatile magnetic separator that allows efficient injection into an ion catcher, i.e., gas-filled stopper/cooler or thermal ionizer, from which a low energy radioactive beam will be extracted. These nuclides will be transported to atomic traps for precision experiments that may test the Standard Model.

Authors:
; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Kernfysisch Versneller Instituut, Zernikelaan 25 , 9747AA Groningen (Netherlands)
Publication Date:
OSTI Identifier:
20798574
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 831; Journal Issue: 1; Conference: International conference on frontiers in nuclear structure, astrophysics, and reactions - FINUSTAR, Isle of Kos (Greece), 12-17 Sep 2005; Other Information: DOI: 10.1063/1.2200963; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 07 ISOTOPES AND RADIATION SOURCES; ATOMS; IONS; ISOTOPE SEPARATION; ISOTOPES; KVI CYCLOTRON; MAGNETIC SEPARATORS; RADIOACTIVE ION BEAMS; STANDARD MODEL; TRAPPING; TRAPS

Citation Formats

Berg, G. P. A., Dammalapati, U., De, S., Dean, S., Dendooven, P., Dermois, O., Jungmann, K., Rogachevskiy, A., Sohani, M., Traykov, E., Willmann, L., and Wilschut, H. W. TRI{mu}P - a Radioactive-Atom Trapping Facility at KVI. United States: N. p., 2006. Web. doi:10.1063/1.2200963.
Berg, G. P. A., Dammalapati, U., De, S., Dean, S., Dendooven, P., Dermois, O., Jungmann, K., Rogachevskiy, A., Sohani, M., Traykov, E., Willmann, L., & Wilschut, H. W. TRI{mu}P - a Radioactive-Atom Trapping Facility at KVI. United States. doi:10.1063/1.2200963.
Berg, G. P. A., Dammalapati, U., De, S., Dean, S., Dendooven, P., Dermois, O., Jungmann, K., Rogachevskiy, A., Sohani, M., Traykov, E., Willmann, L., and Wilschut, H. W. Wed . "TRI{mu}P - a Radioactive-Atom Trapping Facility at KVI". United States. doi:10.1063/1.2200963.
@article{osti_20798574,
title = {TRI{mu}P - a Radioactive-Atom Trapping Facility at KVI},
author = {Berg, G. P. A. and Dammalapati, U. and De, S. and Dean, S. and Dendooven, P. and Dermois, O. and Jungmann, K. and Rogachevskiy, A. and Sohani, M. and Traykov, E. and Willmann, L. and Wilschut, H. W.},
abstractNote = {The TRI{mu}P facility, under construction at KVI, requires the production and separation of short-lived and rare isotopes. For this purpose, we have designed, constructed and commissioned a versatile magnetic separator that allows efficient injection into an ion catcher, i.e., gas-filled stopper/cooler or thermal ionizer, from which a low energy radioactive beam will be extracted. These nuclides will be transported to atomic traps for precision experiments that may test the Standard Model.},
doi = {10.1063/1.2200963},
journal = {AIP Conference Proceedings},
number = 1,
volume = 831,
place = {United States},
year = {Wed Apr 26 00:00:00 EDT 2006},
month = {Wed Apr 26 00:00:00 EDT 2006}
}
  • The status of the TRI{mu}P facility at KVI is reviewed. Recent results on ion catcher devices are described. A thermo-ionizer for use with alkali and earth-alkali elements is close to completion. Concerning the use of superfluid helium as stopping medium, evidence that second sound pulses can be used to extract ions from the helium surface has been obtained. Based on the observation of highly efficient ion transport in helium, neon and argon gas below about 100 K, we propose the operation of noble gas ion catchers at cryogenic temperatures.
  • The Tri{mu}P facility at KVI is dedicated to provide short lived radioactive isotopes at low kinetic energies to users. It comprised different cooling schemes for a variety of energy ranges, from GeV down to the neV scale. The isotopes are produced using beam of the AGOR cyclotron at KVI. They are separated from the primary beam by a magnetic separator. A crucial part of such a facility is the ability to stop and extract isotopes into a low energy beamline which guides them to the experiment. In particular we are investigating stopping in matter and buffer gases. After the extractionmore » the isotopes can be stored in neutral atoms or ion traps for experiments. Our research includes precision studies of nuclear {beta}-decay through {beta}-{nu} momentum correlations as well as searches for permanent electric dipole moments in heavy atomic systems like radium. Such experiments offer a large potential for discovering new physics.« less
  • Pulse radiolysis of aqueous solutions of Pt/sub 2/(..mu..-P/sub 2/O/sub 5/H/sub 2/)/sub 4//sup 4 -/ at pH 4 with added t-BuOH gives Pt/sub 2/(..mu..-P/sub 2/O/sub 5/H/sub 2/)/sub 4/H/sup 4 -/ via reaction with an electron and a proton. Pulsed-laser photolysis (Nd-YAG at 355 nm) of aqueous solutions of Pt/sub 2/(..mu..-P/sub 2/O/sub 5/H/sub 2/)/sub 4//sup 4 -/ with added isopropyl alcohol, phosphorus acid, or hypophosphorous acid also gives Pt/sub 2/(..mu..-P/sub 2/O/sub 5/H/sub 2/)/sub 4//sup 4 -/ by hydrogen atom abstraction. The mixed-valence hydride is similarly formed in methanolic solutions of (PPN)/sub 4/(Pt/sub 2/(..mu..-P/sub 2/O/sub 5/H/sub 2/)/sub 4/) from added triethylsilane or tributyltinmore » hydride. The intermediacy of the Me/sub 2/COH radical is evidenced by the formation of both pinacol and acetone in the photochemically catalyzed dehydrogenation of isopropyl alcohol with Pt/sub 2/(..mu..-P/sub 2/O/sub 5/H/sub 2/)/sub 4//sup 4 -/ in aqueous solution. The other radical, Pt/sub 2/(..mu..-P/sub 2/O/sub 5/H/sub 2/)/sub 4/H/sup 4 -/, disproportionates to Pt/sub 2/(..mu..-P/sub 2/O/sub 5/H/sub 2/)/sub 4/H/sub 2//sup 4 -/ and Pt/sub 2/(..mu..-P/sub 2/O/sub 5/H/sub 2/)/sub 4//sup 4 -/. The Bu/sub 3/Sn radical has been detected by transient difference laser spectroscopy in solutions containing Pt/sub 2/(..mu..-P/sub 2/O/sub 5/H/sub 2/)/sub 4/H/sub 2//sup 4 -/ and Bu/sub 3/SnH. The quenching rates for hydrogen atoms donors with the /sup 3/A/sub 2u/ state of Pt/sub 2/(..mu..-P/sub 2/O/sub 5/H/sub 2/)/sub 4//sup 4 -/*, as measured by the Stern-Volmer equation, are given and compared.« less
  • Two compounds, [Cu5I5](SNC5H4)2 [i] and [Cu3I3](SNC5H4)2 [ii], were synthesized under hydrothermal conditions and the crystal structures were solved. Both compounds crystallized in space group I41/a. The iodide and the sulphur from mercaptopyridine are connected to copper atom, giving the copper atoms tetrahedral coordination geometry. The pyridine end of the organic moiety is non-bonding and fills the empty space around the tetrahedra formed from copper, sulphur and iodide. - Graphical Abstract: A comparison of the central core in both compounds. Display Omitted
  • A comparison of the structural parameters obtained by x-ray and neutron diffraction for the transition-metal hydride complex Mo/sub 2/(eta/sup 5/-C/sub 5/H/sub 5/)/sub 2/(CO)/sub 4/(..mu..-H)(..mu..-P(CH/sub 3/)/sub 2/) was performed to examine the discrepancies between the ''x-ray-determined'' and ''neutron-determined'' values for the structural parameters associated with the bridging hydride ligand. Within the experimental limitations of the x-ray analysis, the x-ray-determined hydrogen position reflects the covalent character of the bent Mo--H--Mo bond with the estimated region of maximum overlap displaced ca. 0.2 A from the hydrogen nucleus along the Mo--H--Mo bisector toward the centroid of the Mo--H--Mo triangle. The consequences of this displacementmore » are (1) an apparent shortening of 0.1 A in the average x-ray-determined Mo--H distance of 1.79 (15) A compared to the average neutron-determined Mo--H distance of 1.86 (1) A and (2) a large increase in the Mo--H--Mo bond angle from the neutron-determined value of 122.9 (2)/sup 0/ to the x-ray-determined value of 133 (3)/sup 0/. For closed-type, bent metal--hydrogen--metal bonds, one should then expect to find shorter average M--H bond distances and larger M--H--M bond angles by x-ray diffraction than by neutron diffraction.« less