NWO - Nederlandse Organisatie voor Wetenschappelijk Onderzoek - print-logo

URL voor deze pagina :

Geprint op :
14 december 2018

Approved FOM programme

Number 114.
Title Fundamental symmetries and interactions - trapped radioactive isotopes as micro laboratories for fundamental physics (TRIµP)
Executive organisational unit BUW
Programme management Prof.dr. K.H.K.J. Jungmann
Duration 2009-2014
Cost estimate M€ 9.3

The aim of this programme is to conduct precision low energy experiments to test the Standard Model of particle physics and to search for physics beyond the Standard Model using radioactive isotopes. It exploits the facility TRIμP. The facility consists of three sections. In the first section the specific radioactive nuclei are produced. A wide range of isotopes can be created, exploiting the rich variety of beams, in terms of energy and species, of the KVI superconducting cyclotron AGOR. A magnetic separator removes the primary beam and makes a first selection of the reaction products. In a second stage a thermal ionizing device stops the isotopes and emits singly charged ions. A high-quality low-energy beam is made of the reaction products. It uses a gas-filled radio-frequency quadrupole filter/trap. This device cools and collects the secondary particles for further manipulation. In the third section the actual trapping is done and the decay studies are made. A combination of traps using the most advanced and innovative techniques developed for fundamental studies in atomic physics research. Each section of the facility holds physics potential of its own and can draw on the particular expertise of the experimental groups. The programme includes the operation, running, research and development as well as adaptations of the superconducting cyclotron AGOR to provide beams for the TRImP experiments. The facility and its components is open for external users..

Background, relevance and implementation
The core of this programme is searches for physics beyond the Standard Model of fundamental interactions. This quest is a focal point of present-day physics. It is pursued by astrophysics both at satellites and earthbound facilities, by high-energy/luminosity collisions at large accelerators and storage rings, and in small-scale experiments at low energy. At TRI μ P, the boundaries of the Standard Model will be explored in small-scale experiments. To this aim high-precision measurements are carried out, in particular tests of the discrete symmetries C, P and T. The experiments exploit the full potential of the KVI cyclotron AGOR for the production of isotopes in combination with the novel and powerful techniques that have become available by trapping and cooling atoms and ions. High-precision measurements of nuclear decays mediated by the electroweak force will give direct access to observables that are sensitive to deviations from the Standard Model. This goal requires to detect the complete decay process and necessitates the recording of the minute velocity of the recoiling daughter nucleus. Trapping techniques are essential to collect, manipulate and hold the unstable atomic nuclei for such accurate decay studies. A permanent electric dipole moment is searched for in radioactive radium atoms and parity violation in single radium ions is most accurately measured and the basic CPT and Lorentz invariance is precisely tested. The development of the required innovative techniques produces physics results of general interest. Furthermore, the facility offers opportunities to international users for low energy precision particle physics experiments. Beam time for experiments with TRImP is granted based on proposals and their evaluation by an international programme advisory committee. External users for TRImP are welcome.

This programme started in January 2009 as a combined follow-up programme of the closed FOM-programmes TRIµP (nr. 48) and AGOR (nr. 24) and the former mission budget KVI (MBK).
The availability of AGOR for this programme has been finished spring 2014. The experiments at AGOR are presently in the analysis phase.
The final evaluation of this programme will consist of a self-evaluation initiated by the programme leader and is foreseen for early 2015.

Please find a research highlight that was achieved in 2013 within this FOM programme here.