3–5 Apr 2019
Europe/Bucharest timezone

Organising committee : Constantin Mihai (IFIN-HH), Caterina Michelagnoli (ILL)

Prompt and delayed spectroscopy of the fission fragments from the 238U(n,f) and 232Th(n,f) reactions with nu-ball/LICORNE

Not scheduled
15m
Contributed talk

Speaker

Dr Jonathan Wilson (IPN Orsay)

Description

An experimental campaign to perform prompt and delayed spectroscopy of the fission fragments from the 238U(n,f) and 232Th(n,f) reactions has been recently carried out. The seven-week-long campaign was performed with the nu-ball spectrometer coupled to the LICORNE directional fast neutron source based at the ALTO facility of the IPN Orsay and invloved a large international collaboration. These experiments have clear complimentarities to the recent FIPPS campaign at the ILL, since different fissioning compound nuclei are studied (239U, 233Th with fast neutrons at nu-ball/LICORNE and 234,236U and 242Pu with thermal neutrons at FIPPS). A comparison of the major differences of these two complementary experimental approaches can be made: For example, FIPPS has longer available running times and the ILL provides higher neutron fluxes, with thermal-neutron-induced fission cross sections also much higher than fast-neutron-induced fission cross sections. Hence, to achieve similar fission rates (25 - 100 kHz) with LICORNE requires the use of tens of grams of target material, which can attenuate the lowest energy gamma rays emitted. Nonetheless, the fissioning sytems studied with nu-ball/LICORNE are significantly more neutron-rich than those that can be studied with FIPPS. Furthermore, both experiments have their own unique problems with background from unwanted reactions and beta decays. These have been solved with a fission tag/active-scintillator target in the case of FIPPS, and neutron-beam pulsation combined with event-calorimetry for nu-ball/LICORNE. Indeed the calorimetry aspects of the nu-ball array give access to some important new fission observables which can be correlated with the detection of individual fragments. Emerging physics results from the first nu-ball campaign will be presented.

Primary authors

Dr Jonathan Wilson (IPN Orsay) Dr Matthieu Lebois (IPN Orsay) Dr Nikola Jovancevic (IPN Orsay) Mr Damien Thisse (IPN Orsay) Ms Rhiann Canavan (University of Surrey) Ms Rosa-Belle Gerst (University of Köln) Dr Matthias Rudigier (University of Surrey) Dr David Etasse (LPC Caen)

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