International Collaborations

Logo GANIL

TONERRE detector
Collaboration with GANIL-SPIRAL2
Website: http://www.ganil-spiral2.eu/
Contact persons: Catalin BORCEA, Mihai STANOIU, Ruxandra BORCEA

TONERRE detector built by IFIN-HH in collaboration with LPC-Caen and GANIL was employed in numerous experiments for neutron energy and multiplicity measurements in coincidence with gamma spectroscopy. It allowed structure studies of very neutron rich nuclei by means of beta-delayed neutron emission decay.

Time Projection Chamber

2-proton decay was discovered at GANIL by a large international collaboration led by CENBG Bordeaux with IFIN-HH membership.

IFIN-HH contributed to the development of the Time Projection Chamber (TPC) that was able to reveal the 2p decay mode of those highly neutron-deficient nuclei.

Chateau de Cristal

Chateau de Cristal BaF2 array employed in collaboration:

  • double fragmentation experiments using SPEG spectrometer to study exotic nuclei: shell robustness at Z=20 (21+ state in 36Ca) and shell breaking at N=28 (21+state in 42Si);
  • Coulomb excitation experiments to measure the B(E2) rates as a strong evidence of collective effects in neutron-rich nuclei.
  • gamma conversion

    Compact high-efficiency setup for combined gamma-conversion electrons (and/or e-e+ from IPF) spectroscopy for studies of isomeric states populated in fragmentation or beta-decay.

    02+ states revealed and characterized in 34Si and 44S as indications of shell evolution and shape coexistence towards the Island of Inversion at N=20 and inside the one at N=28 respectively.

    SPIRAL1

    Astrophysical studies using SPIRAL1 radioactive beams to characterize unbound excited states in resonant inelastic scattering experiments.

    The image shows the results of such an experiment targeting the 15F unbound nucleus and its excited states.

    SPIRAL2

    IFIN-HH designed and built the Beam Loss Monitor system - a security equipment that is being installed at the GANIL SPIRAL2 facility as an in-kind contribution of Romania to the SPIRAL2 project.

    ISOLDE logo


    Implantation plastic scintillator
    Implantation Plastic scintillator. The tape passes through the plastic scintillator offering an absolute efficiency close to 95%. The implantation chamber has been designed to accomodate the HPGe detectors and reduce the energy losses of the 𝛾-rays.
    The ISOLDE Decay Station experimental setup
    Website: http://isolde.web.cern.ch/
    Contact persons: Nicolae MARGINEAN,Alexandru NEGRET

    The IFIN-HH team contributes actively to the ISOLDE facility, namely the construction of the ISOLDE Decay station (IDS) with a large Romanian contribution in equipment, manpower and expertize. Following the successful commissioning in August 2014 several experiments were performed and already from the online analysis it becomes clear that these experiments are expected to lead to valuable physics results.

    The detection system of IDS is very versatile, with a core of four germanium clusters (HPGe) used for gamma detection. Four different setups can be provided depending on the case under study and physics aim:

  • high efficiency beta-gamma spectroscopy
  • neutron time-of-flight spectroscopy
  • charged particles spectroscopy using Si detectors
  • beta-decay fast-timing studies using LaBr3(Ce) detectors.
  • The different experimental configurations are shown on the picture below.
    IDS configurations

    IDS configurations. Each configuration has been used for several experiments over past years. The experiments performed during the 2016 campaign are indicated beside their respective configuration.

    Except the "charged particles spectroscopy" for which the beam is implanted within a thin carbon foil, all the configurations are compatible with a tape system. The beam of interest is implanted within a tape. In order to improve the signal/noise ratio and measure the short lived components the tape can be moved away from the detection setup.

    High Efficiency 𝛽-𝛾 spectroscopy configuration
    High Efficiency 𝛽-𝛾 spectroscopy configuration

    High Efficiency 𝛽-𝛾 spectroscopy

    The experimental setup consists of 5 HPGe clover detectors and a newly designed plastic scintillator as a beta-trigger. The beta efficiency was improved by using a thick rectangular-like beta detector covering 95% of solid angle around the implantation tape. The light produced by scintillation is collected simultaneously by 2 photomultipliers, aiming at lowering the thresholds below the PMT's noise level thanks to the application of coincidence between the two light outputs.
    The standard IDS NUTAQ based data acquisition system is employed to acquire all the signals.

    Fast-timing configuration with 2 LaBr3(Ce)
    Fast-timing configuration with 2 LaBr3(Ce) and one fast plastic scintillation detector.

    Fast Timing technique configuration

    The fast-timing technique is based on the use of fast scintillator detectors which allow to determine time references studying the radiative decay. This allows the determination of short lifetimes of nuclear excited states. The available range for measurement is 10 ps - 100 ns.
    The principle of the fast-timing technique is illustrated on the picture on the left.

    LaBr3(Ce), fast plastic scintillators and HPGe clover detectors are used for life-time measurements using the βɣɣ(t) fast-timing technique.
    The IDS fast-timing configuration accommodates a fast plastic scintillator to detect the β, 4 HPGe (High Pure Germanium) detectors and 2 LaBr3(Ce) scintillators to detect ɣ-rays.