Münster 2011 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 33: Struktur und Dynamik von Kernen - Poster
HK 33.6: Poster
Wednesday, March 23, 2011, 14:00–16:00, Foyer Chemie
Measurement of the fission fragment mass distribution of the hyperdeformed states in 236U — Tamas Tornyi1, Janos Gulyas1, Attila Krasznahorkay1, Margit Csatlos1, •Lorant Csige2, Rob Bark3, and Nikolay Kondratyev4 — 1Ins. of Nucl. Res. of the Hun. Acad. of Sci., Debrecen, Hungary — 2Ludwig Maximilians Universitat, Munich, Germany — 3iThemba LABS, Somerset West, South Afrika — 4FLNR JINR, Dubna, Russia
In a recent work experimental evidence for hyperdeformed states in U isotopes was given [1]. From such highly elongated nuclear states much narrower fission fragment mass distribution is expected than from non-resonant fission as predicted in a recent calculation [2]. In order to demonstrate this effect we performed a preliminary time-of-flight correlation measurement for the fission fragments employing the 235U(d,pf) reaction.
The experiment was carried out at the Debrecen cyclotron using 9 MeV deuteron beam on a 90 ug/cm2 thick 235U target. The essence of the experiment was the measurement of the time-of-flight (TOF) distribution of the two fission fragments in coincidence with the outgoing protons in order to get information on the mass distribution of the fission fragments originated from the decay of the hyperdeformed states. The TOF of the fragments was measured by a 4pi position sensitive fission detector equipped with delay-line readout while a four-fold Si-detector array was used to determine the energy of the ejected protons. [1] A. Krasznahorkay et al., Phys. Rev. Lett. 80 (1998) 2073. [2] S. Cwiok et al., Phys. Lett. B322 (1994) 304.