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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.

TIGRESS Detector at IDS
VANDLE neutron detector at IDS
HPGe clover
SPEDE
IDS Particle detectors
IDS High-efficiency beta detector

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, angular correlation, charged particle spectroscopy and conversion electron spectroscopy (using the newly employed SPEDE detector).

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. Since 2018, the SPEDE Spectrometer is part of the IDS setup dedicated for conversion electron spectroscopy.

Experimental Layouts of IDS in 2018

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.

IDS Detectors documentation:

Collaborating institutes

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
  • IDS Collaboration Meeting , December 4, 2018, ISOLDE - CERN
  • IDS Collaboration Meeting (video-conference), March 19, 2020
  • IDS Collaboration Meeting (video-conference) , November 16, 2020
  • IDS Experimental Campaign Preparation Meeting (video-conference) , May 05, 2021
  • More detailed information, technical specifications, meeting reports and presentations, can be found here. (CERN account and permission required)

    Contact

    Hilde De Witte (Resources Coordinator)
    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 (Collaboration Spokesperson)
    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

    2021 -

    Expt. Spokesperson, institution Beam Description Details Publications
    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. Despite the malfunction of the initial target that was expected to deliver the neutron-rich Cu isotopes from the original proposal, we were offered an alternative target from which we extracted 181,183,184,185Tl and performed fast-timing measurements for states in their daughter nuclei with an improved setup of 3 LaBr3(Ce) detectors and 6 HPGe clover detectors. 7 shifts to be reported. 7 shifts

    16-19 July

    e-log proposal
    IS665 B. Andel, KUL, Leuven, BE 178,176,175Au Laser assisted studies of beta-delayed fission in 178,176Au and of the structure of 175Au. Both the bDF and hfs measurements will be performed at the IDS setup, for which the standard configuration consists of a tape station and 4 HPGe clover detectors. An annular silicon detector will be installed in front of the implantation tape for measurement of alpha particles and FFs with a geometric efficiency of ~20% in a configuration reminiscent of the previous work with the Windmill setup. A plastic scintillator detector will be placed behind the tape to register beta particles. The chamber will be surrounded by fasttiming LaBr3 detectors to measure lifetimes of levels populated in 178Pt as a by-product during the bDF run. 14 shifts.

    27 - 31 August

    e-log proposal
    IS456 T. Cocolios, KUL, Leuven, BE 219-220Po Study of ground-state and long-lived isomeric-state properties in 211,212,219,220Po isotopes. To overcome preponderant isobaric Fr contamination, the RILIS in the LIST mode will be utilised. The new data will be used to delineate the region of charge-radii odd-even staggering reversal for Z > 82, N > 126; to study the properties of high-spin states with longer half-lives in the vicinity of N = 126; and to study the systematic α-decay properties in neutron-rich pre-actinide nuclei to test the nuclear models in the region. 9 shifts

    Date TBD

    e-log proposal
    IS659 H. Fynbo, Aarhus University, Aarhus, DK 8He,9Li Precise measurements of the β-decays of 9Li and 8He for reactor neutrino experiments requesting 10 shifts of beam time of 8He produced from a CaO target, and 8 shifts of beam time of 9Li produced from a Ta target. The experiment will employ the IDS setup with the ISOLDE beam stopped in a thin carbon foil surrounded by a compact setup of Double-Sided Silicon detectors. Neutrons will be measured with the INDiE array. 18 shifts.

    Date TBD

    e-log proposal
    IS662 R. Grzywacz, University of Tennessee, ORNL, Knoxville, USA 134In Beta-delayed neutron emission of 134In and search for i13/2 single particle neutron state in 134Sn using the IDS standard set of 4 clover detectors, ~4% efficiency at 1 MeV, the IDS in-vacuum beta detector, 90% electron detection efficiency, and the newly commissioned IDS Neutron DEtector (INDiE). The neutron detection will be enhanced by 15 NEXT neutron detector modules, which will have much higher neutron energy resolution due to their segmentation and provide additional 3% neutron detection efficiency. These detectors are capable for neutron-gamma discrimination above 400 keV neutron energy, which is an added benefit for this measurement. These detectors will be operated at 50 cm TOF and will be placed on both sides of INDiE. Both detectors have a neutron detection threshold of about 100 keV. 18 shifts.

    Date TBD

    e-log proposal
    IS664 R. Heinke, KUL, Leuven, BE 230-231Ac Investigation of octupole deformation in neutron-rich actinium using high-resolution in-source laser spectroscopy. The measurements will be achieved by using a new operation mode of the LIST ion source. Detection of the ionization rate with respect to the laser frequency can be carried out for 230-231Ac using the ISOLDE Decay Station (IDS) with a fast movable tape implantation point with an annular Si detector in front and plastic scintillators behind. 5 shifts.

    Date TBD

    e-log proposal
    LOI216 A. Andreyev, University of York, York, UK 230-234Ac,Fr Feasibility studies towards the systematic investigation of the beta-delayed fission in the even-A neutron-rich actinides. The experimental setup will be similar to INTC-P-558 with the option of installing an array of several solar cell detectors which are less sensitive to the radiation damage, in front of the implantation tape for measurement of single alpha particles and fission fragments with geometric efficiencies of ~20% and of ~40%, respectively. 4 shifts.

    Date TBD

    e-log proposal
    LOI217 B. Olaizola, CERN, CH 164-170Tb Development of neutron-rich Tb beams for a systematic study approaching the doubly mid-shell in rare-earth nuclei. The goal of the proposal is to study the lifetimes of the first 2+ states in even-A Dy isotopes and particularly in 170Dy (Z=66, N=104) using the beta-decay fast timing method. An additional 3 shifts were requested in order to determine the yields of the most neutron-rich Tb nuclei using MR-TOF MS. The experiment will use, for yield measurements, the ISOLDE Decay Station and a setup including the tape station, plastic scintillator, 4 clovers and 2 LaBr3(Ce) detectors. 3 shifts.

    Date TBD

    e-log proposal
    INTC-P-568 K. Riisager, Aarhus University, Aarhus, DK 11Li The beta-delayed 2n and 3n decays of 11Li will be measured at IDS via coincidences between neutrons and heavy charged particles. This will allow neutron energy spectra for the two branches to be extracted separately for the first time. Most of the decay scheme, in particular the multi-particle break-up channels, will be reconstructed up to 18 MeV excitation energy in 11Be and the deduced beta strength compared to theory. 17 shifts

    Date TBD

    e-log proposal
    INTC-P-557 P. Jones, iThemba LABS, Somerset West, SA 142Cs Decay study of 142Cs at the ISOLDE Decay Station to provide precise data on this nucleus including decay branching, feeding and the missing gamma-ray intensity to address evaluated data for nuclear structure and also of significance for first-forbidden transition nuclei in reactor antineutrino anomaly studies. 10 shifts

    Date TBD

    e-log proposal
    INTC-P-585 L. M. Fraile, Universidad Complutense, Madrid, ES 130-132Cd We propose to use beta-decay and beta-n decay of neutron-rich Cd isotopes to populate excited states in neutron-rich In (Z=49) isotopes at and around N=82. High-resolution γ-spectroscopy will be performed. The measurements will be complemented by excited-state lifetime measurements using the fast-timing technique. 12 shifts

    Date TBD

    e-log proposal
    IS687 V. Guadilla, University of Warsaw, PL 22O, 27Na Precise measurement of the beta-decays of 27Na (TAS) and 22O (IDS). The IDS setup will use the high-efficiency beta-gamma configuration. 3 shifts

    Date TBD

    e-log proposal
    IS694 N. Bernier, University of the Western Cape, SA 80,82Y Investigation of shape effects in 80,82Sr through the beta+/EC decay of 80,82Y and the measurement of internal conversion electrons using the SPEDE electron spectrometer at IDS equipped with a tape station, four germanium clover detectors, two LaBr3(Ce) detectors, and a fast plastic detector. 3 shifts

    Date TBD

    e-log proposal
    LOI219 A. Gottardo, LNL-INFN, Legnaro, IT 208-216Tl Development of 208-216 Tl beams, paving the way for future studies of the structure of neutron-rich nuclei beyond 208Pb, by means of isomer and beta-decay spectroscopy at IDS. Availability of Tl beams will also open the possibility for nuclear radii, moments and masses in this relatively unexplored region.9 shifts

    Date TBD

    e-log proposal

    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 PRC 102, 014328 (2020)
    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.

    25 - 27 Oct

    e-log proposal PRC 102, 024322 (2020)

    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 APP B 49, 523 (2018)
    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 APP B 51, 717 (2020)
    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 PRC 99, 024304 (2019)
    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 PRC 101, 054311 (2020)

    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)
    PRC 100, 034306 (2019)
    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 PLB 793, 271-275 (2019)
    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
    IS545 U. Datta Pramanik, Saha Institute Of Nuclear Physics, Kolkata, IN 116-118Ba We propose to study decay of neutron deficient isotopes 116-118 Ba using Double sided Silicon Strip Detector (DSSSD). To study delayed-proton and alpha decay branching ratios of 116-118 Ba are of special interest because of their vicinity to the proton drip line. proposal status report

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