Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268


Tue., November 20, 2007, at 11:00 a.m. (refreshments at 10:40 a.m.)

Proton-proton correlations in the 2p decay of 45Fe

Marek Pfutzner, University of Warsaw, Warsaw, Poland
Building 6008 Conference Room

In a recent experiment performed at NSCL/MSU we studied in detail the decay of 45Fe by means of a novel type of an ionization chamber, employing digital imaging to record tracks of charged particles. This technique yielded clear and unambiguous images of the two-proton radioactivity (2p) events of 45Fe. The reconstruction of these events in three dimensions allowed us to determine the angular and energy correlations between protons emitted in the ground-state 2p decay for the first time. The results indicate a genuine 3-body character of this decay and rule out a simple diproton scenario.

In addition, events associated with the beta decay branch of 45Fe were identified, including beta-delayed one-proton, beta-delayed two-proton, and even beta-delayed three-proton emission. The latter decay channel was observed for the first time. In the talk, the novel experimental technique will be described and the final results will be presented. The current status of the 2p radioactivity studies, as well as possibilities and plans for further investigations will also be discussed.