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ISOLDE Decay Station (IDS)

IDS is a permanent detector set-up at the ISOLDE facility at CERN, dedicated to decay spectroscopy for research into nuclear structure, nuclear engineering and astrophysics.

IDS
VANDLE neutron detector at IDS
HPGe clover

The versatile design of IDS allows for the installation of different types of detector around the implantation point, alongside its own four HPGe clovers. It can hence be used for many specialised decay measurements, including fast timing, neutron time-of-flight, and beta, proton and alpha particle emission.

The Decay Station is an ideal tool for studying the decay properties of radioactive nuclei across the Segré chart; light to heavy, proton-rich to neutron-rich. The nucleus of interest is only limited by the production capabilities of the targets at ISOLDE.

Current capabilities

While the four HPGe clovers are used for most experiments at IDS, the addition of other HPGe detectors allows for increased statistics when performing gamma ray spectroscopy. Two openings in the holding structure (shell) at 90 degrees to the beamline, and a third located coaxially, in the horizontal plane may be used to position plastic beta detectors (two located here at IDS) or fast-timing detectors. The detector chamber itself may be changed according to the needs of the experiment, as may be the contents (such as DSSDs for particle detection). Since 2016, a dedicated neutron time-of-flight detector is permanently located at IDS (IDSND) and is based on the VANDLE (University of Tennessee, Knoxville, USA) detector design.

Experimental Layouts of IDS in 2016

Basic arrangement

  • IDS is at the end of the RC4 beamline, which can use the beam from either GPS (General Purpose Separator) or HRS (High Resolution Separator).
  • The ions pass through a variable aperture collimator (2-10 mm) and are implanted on tape inside a vacuum chamber, positioned above the dedicated tape station. This tape may be moved automatically (in response to proton pulses from the PS Booster) or manually, depending on the desired implantation time.
  • Four backward-facing high-purity germanium detectors, with LN2 cooling canisters, are evenly spaced azimuthally and point directly at the centre of the chamber. These may be inserted and retracted manually. Each consists of four HPGe crystals, giving IDS 16 crystals in total.
  • Data is read through the dedicated NUTAQ digital acquisition system using the GREAT triggerless total data readout method.
Experimental Layouts of IDS in 2016
Experimental Layouts of IDS in 2016

IDS Detectors documentation:

Collaborating institutes

  • Belgium (KU Leuven)
  • Denmark (Aarhus University, Department of Physics and Astronomy)
  • Finland (University of Jyväskylä)
  • France (CEN Bordeaux-Gradignan; IPHC Strasbourg; LPC Caen; LPSC Grenoble; Institut de Physique Nucléaire - Orsay - IN2P3/CNRS and Université Paris Sud; Institut Max von Laue – Paul Langevin - ILL)
  • Germany (Institut für Kernphysik - TU Darmstadt; Institut für Kernphysik - Universität zu Köln; Ludwig-Maximilians-University München - Faculty of Physics; TU München)
  • Poland (NCBJ BP1)
  • Romania (IFIN-HH Bucharest)
  • Spain (CIEMAT Madrid; IEM-CSIC Madrid; IFIC-CSIC Valencia; UCM Madrid)
  • Sweden (Lund University – Physics Department)
  • Switzerland (ISOLDE)
  • UK (STFC Daresbury Laboratory; University of Liverpool; University of Manchester; University of Surrey; University of York)

IDS is supported by 26 institutes across Europe, and used by many more globally.

Past and future IDS meetings

  • Workshop on a New Decay Station at Isolde, October 3, 2012, ISOLDE - CERN
  • IDS steering committee meeting, August 27, 2013, telephone conference
  • IDS collaboration meeting, October 21, 2013, ISOLDE - CERN
  • IDS collaboration meeting, December 18, 2014, ISOLDE - CERN
  • IDS collaboration meeting, November 11, 2015, ISOLDE - CERN
  • ISOLDE Decay Station (IDS) collaboration meeting, December 4, 2018, ISOLDE - CERN
  • More detailed information, technical specifications, meeting reports and presentations, can be found here. (CERN account and permission required)

    Contact

    Hilde De Witte
    KU Leuven - Institute for Nuclear and Radiation Physics
    Celestijnenlaan 200d - box 2418
    3001 Leuven
    Belgium
    tel. +32 16327270
    email: hilde.dewitte@kuleuven.be

    Razvan Lica
    IFIN-HH - "Horia Hulubei" National Institute for Physics and Nuclear Engineering
    Str. Reactorului no.30, P.O.BOX MG-6
    Bucharest - Magurele
    ROMANIA
    tel. +40 724484401
    email: razvan.lica@nipne.ro

    Website: razvan.lica@cern.ch, t.berry@surrey.ac.uk

    2018

    Expt. Spokesperson, institution Beam Description Details Publications
    IS633b O. Tengblad, IEM-CSIC, Madrid, ES 8B Study of the decay of the proton halo nucleus 8B at IDS using the particle spectroscopy setup with the aim of determining the beta strength for decays into highly excited states of 8Be, 8 shifts (LA1).

    19 - 23 April

    e-log proposal
    IS622 A. Illana, KUL, Leuven, BE 74‑79Cu The experiment will clarify and expand the level schemes and measure lifetimes of low-lying transitions in Zn isotopes ranging from A=74 to A=79. It will be performed with the fast-timing setup of IDS equipped with 4 Clover Germanium detectors, 2 LaBr3(Ce) detectors, a fast plastic detector and in combination with the tape station, 19 shifts.

    24 - 29 May

    e-log proposal
    IS610b L. M. Fraile, Universidad Complutense, Madrid, ES 132In Gamma-ray and fast-timing spectroscopy of nuclei around the doubly-magic 132Sn nucleus, of strong interest to model descriptions of single-particle states, 4 shifts.

    4 - 6 June

    e-log proposal
    IS650 R. Lica, IFIN‑HH, Bucharest, RO 214‑218Bi Probing the structure of yrast states in even-even 214,216,218Po through fast-timing measurements following the β-decay of 214,216,218Bi, 7 shifts.

    4 - 6 July

    e-log proposal
    IS608b A. Andreyev, University of York, York, UK 214‑218Bi Study of shape-coexistence and shape-evolution phenomena in the long chain of bismuth isotopes (Z=83) by in-source laser spectroscopy measurements of isotopic shifts and hyperfine structures. Continuation of the 2017 run, 3 shifts.

    8 - 9 July

    e-log proposal
    IS641 K. Rezynkina, KUL, Leuven, BE 182‑186Tl Study of the structure of the low-lying excited states in 182,184,186Hg through β+/EC decay of 182,184,186Tl using the newly-employed electron conversion spectroscopy setup of IDS, 5 shifts.

    24 - 28 Oct

    e-log proposal

    2017

    Expt. Spokesperson, institution Beam Description Details Publications
    IS632 M. Madurga, University of Tennessee, Knoxville, USA 133In Beta-delayed neutron emission towards neutron-unbound states in 133Sn will be observed using the newly commissioned ISOLDE Decay Station Neutron Detector (IDSND). RILIS will also be used to study the hyperfine structure of In isotopes. 12 shifts.

    27 April - 1 May

    e-log proposal
    IS633 O. Tengblad, IEM-CSIC, Madrid, ES 8B Study of the decay of the proton halo nucleus 8B at IDS using the particle spectroscopy setup with the aim of determining the beta strength for decays into highly excited states of 8Be. 11 shifts.

    25 - 28 May

    e-log proposal
    IS608 A. Andreyev, University of York, York, UK 187‑218Bi Study of shape-coexistence and shape-evolution phenomena in the long chain of bismuth isotopes (Z=83) by in-source laser spectroscopy measurements of isotopic shifts and hyperfine structures. RILIS-IDS-WINDMILL experiment. 12 shifts.

    20 - 26 June

    e-log proposal

    2016

    Expt. Spokesperson, institution Beam Description Details Publications
    IS605 O. S. Kirsebom, Aarhus University, Aarhus, DK 16N Study of 16N beta decay to clarify βα decay branching ratio, with significance for astrophysically important CO reaction. Particle detection was performed using silicon strip detectors of varying thicknesses. e-log proposal PRL 121, 142701 (2018)
    IS609 Z. Janas, University of Warsaw, Warsaw, PL 8He Neutron detection (performed using the newly built on-site IDSND detector array based on the VANDLE design) alongside beta and gamma spectroscopy to study the beta-delayed neutron branching of 8He into 7Li. Data should clarify current conflicts in B(GT) measurements for the beta decay of this exotic nucleus. e-log proposal
    IS474 L. M. Fraile, Universidad Complutense, Madrid, ES 67Mn Fast-timing studies of nuclei below 68Ni populated in the beta-decay of Mn isotopes. e-log proposal
    IS610 L. M. Fraile, Universidad Complutense, Madrid, ES 132In Gamma-ray and fast-timing spectroscopy of nuclei around the doubly-magic 132Sn nucleus, of strong interest to model descriptions of single-particle states. e-log proposal APP B 49, 523 (2018)
    IS579 G. Benzoni, INFN, Milan, IT 150Cs Study of octupole deformation in n-rich Ba isotopes populated via beta decay. This represented a partly successful continuation of the incomplete 2014 run. e-log proposal PRC 97, 024305 (2018)
    IS588 Z. Podolyák, University of Surrey, Guildford, UK 207,208Hg Study of core breaking and octupole low-spin states in 207Tl through gamma and beta spectroscopy of 207,208Hg beta-decay using a fifth HPGe clover detector, angular correlations providing a method of spin-parity assignment. Lifetime measurement of 208Hg, making use of the capabilities of the molten lead target at ISOLDE. This represented the successful continuation of the 2014 incomplete run. e-log proposal

    2015

    Expt. Spokesperson, institution Beam Description Details Publications
    IS507 H.O.U. Fynbo, Aarhus University, Aarhus, DK 20Mg Study of the beta-decay of 20Mg relevant for the astrophysical rp-process as well as improved information for detailed comparison with state of the art Shell-Model calculations and for comparison with the mirror beta-decay of 20O. e-log proposal EPJ A52, 304 (2016)
    IS530 F. Negoita, IFIN‑HH, Bucharest, RO 34Mg Study of low-lying intruder states in 34Al and 34Si sequentially populated in beta decay of 34Mg. e-log proposal PRC 95, 021301 (2017)
    IS590 C. Sotty, KUL, Leuven, BE 68Mn Characterization of the low-lying 0+ and 2+ states of 68Ni. After 3 unsuccessful trials, the fast-timing part of the experiment could be carried out in good conditions in Sept. 2015. The 11 remaining shifts will be used for electron spectroscopy. e-log proposal
    IS599 A. Gottardo, IPN, Orsay, FR 51-53K Beta-delayed Neutron Spectroscopy of 51,52,53K isotopes with the ISOLDE Decay Station and the VANDLE array. First neutron spectroscopy campaign with VANDLE detector at IDS/ISOLDE. First use of the new in-vacuum IFIN-HH plastic scintillator. e-log proposal
    IS600 M. Madurga, CERN, Geneva, CH 130,132Cd Beta-delayed Neutron Spectroscopy of 130-132Cd isotopes with the ISOLDE Decay Station and the VANDLE array. Neutron spectroscopy of beta-delayed precursors of 130-132Cd with VANDLE. First run in July hampered by RILIS problems. All 12 shifts successfully finished in October 2015. e-log proposal

    2014

    Expt. Spokesperson, institution Beam Description Details Publications
    Commissioning R. Lica, CERN/IFIN-HH, Geneva/Bucharest, CH/RO 129In Fast-timing study of the 129Sn structure populated in the beta decay of 129In. This experiment took place after the failed attempt of IS590. e-log PRC 93, 044303 (2016)
    IS577 H.O.U. Fynbo, Aarhus University, Aarhus, DK 31Ar Beta-3p spectroscopy and proton-gamma width determination in the decay of 31Ar e-log proposal APP B 47, 747 (2016)
    IS579 G. Benzoni, INFN, Milan, IT 148-150Cs Using lanthanum bromide fast-timing detectors alongside the HPGe clovers to investigate r-process barium isotopes, predicted to exhibit low-energy octopole deformations. e-log proposal J. Phys. G 44 054002 (2017)
    IS588 Z. Podolyák, University of Surrey, Guildford, UK 207,208Hg Study of core breaking and octupole low-spin states in 207Tl through gamma and beta spectroscopy of 207,208Hg beta-decay using a fifth HPGe clover detector, angular correlations providing a method of spin-parity assignment. Preliminary lifetime measurement of 208Hg, making use of the capabilities of the molten lead target at ISOLDE. e-log proposal
    IS590 C. Sotty, KUL, Leuven, BE 68Mn Characterization of the low-lying 0+ and 2+ states of 68Ni. First trials were unsuccessful because of the ISOLDE target failure. e-log proposal

    © 2018, IDS Collaboration.

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