Job details

Job posted by Weizmann Institute of Science (24/10/2012 00.30)

Phd research position in the department of Department of Particle Physics and Astrophysics

Please note that the job is no longer active!

Fundamental InteractionStudies with low-energy radioactive beams - plans, design and measurements. Work at our in-house laboratory and associated, at a later stage, with the newly-constructed SARAF accelerator at SOREQ.


Phd Research position in the department of Department of Particle Physics and Astrophysics at Weizmann institute of Science in the group of Michael Hass for 4 years. We have recently embarked on a reserach program to measure minute, possible changes in parameters of beta decay, in order to probe effects that belong to phenomena of "beyond the standar model"nature. Trapped radioactive atoms and ions present exciting opportunities for the study of fundamental interactions and symmetries. For example, detecting beta decay in a trap can probe the minute experimental signal that originates from possible tensor or scalar terms in the weak interaction. Such scalar or tensor terms affect the angular correlation between a neutrino and an electron in the beta-decay process, thus probing new physics of beyond-the-standard-model nature. Traps are mandatory for such experiments since the recoiling nuclei, subsequent to the beta decay, are at sub-keV energies. The current status of Fundamental Interaction studies with Electromagnetic traps and with Magneto Optical Traps is well documented [1]. In this study we present a novel approach � that of using an Electrostatic Ion Beam Trap (EIBT) for these purposes. As an example we focus on the particular case of the  correlation in the decay of 6He. Following the pioneering work at the Weizmann Institute, the EIBT is being used worldwide (Germany, France, India, Japan and USA) in atomic and molecular physics experiments [2]. However, injecting and trapping radioactive nuclei for Fundamental Interaction studies in an EIBT device is an entirely novel direction that has never been tried before. This direction offers significant improvements in detection efficiency (paramount consideration when working with radioactive beams of limited intensity) and ease-of-of-operation. The principle of operation of an EIBT is based on the analogy to classical optical resonator: it is possible to store a beam of photons between two spherical mirrors separated by distance L if the focal length f fulfils the stability condition, namely: L/4 < f < ∞. The basic EIBT consist of a set of eight electrodes both acting as an electrostatic mirror by producing a retarding field which reflects the beam along its path and focuses it on the lateral direction. Thus the ions bounce back and forth between the two mirrors. The typical distance between the electrostatic is 500 mm. Since the ion trap is completely electrostatic, there is no upper mass limit on the stored ion beam, allowing the study of radioactive isotopes which cannot be performed in magneto-optical-traps. The lifetime of the stored beam is mainly limited by the pressure in the trap chamber and typically amounts to 3 second for 10-10 mbar. For comparison we note that the half life of 6He is 0.8 seconds. For each injection-trapping cycle the number of stored ions (produced by the 9Be(n,)6He reaction using fast neut

Nr of positions available : 1

Please note that the full description may be available in the national language since some job boards have their own publication policy. Thank you for your understanding!

Research Fields


Career Stage

Early stage researcher or 0-4 yrs (Post graduate)
Experienced researcher or 4-10 yrs (Post-Doc)
More Experienced researcher or >10 yrs (Senior)

Research Profile

Not defined


For normal benefits and financial support, please consult the regulations available at


Required Research Experiences
Main Research Field Physics
Required Languages
Language ENGLISH
Language Level Good
Required Education Level
Degree Field Physics
Required Research Experiences
Years of Research Experience 1
Required Education Level
Degree BSc or MSc
GET MORE! The EURAXESS Services Centres

To better plan and organise their stay in a foreign European country, researchers and their families can also benefit of the free and personalised assistance offered by the EURAXESS Services Centres, a network of more than 200 centres located in 40 different European countries.

Envisaged Job Starting Date


Application Deadline


Application e-mail

Other job details
Job ID


Type of Contract







Weizmann Inst. of Science



EU Research Framework Programme
Is the job funded through the EU Research Framework Programme?


Weizmann Institute of Science

Department of Particle Physics and Astrophysics
Herzel St.
76100 - Rehovot
phone 972 08 9343997