First results from the new double velocity–double energy spectrometer VERDI
| Autor: | M.O. Frégeau, Th. Gamboni, Marzio Vidali, W. Geerts, Stephan Oberstedt, F.-J. Hambsch |
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| Jazyk: | angličtina |
| Předmět: |
Physics
Nuclear reaction Nuclear and High Energy Physics Neutron multiplicity Spectrometer Fission fragment mass yield 010308 nuclear & particles physics Fission Nuclear data 2E-2v method 01 natural sciences Particle detector Nuclear physics Time of flight Nuclear fission 0103 physical sciences Neutron ν(A) 010306 general physics Nuclear Experiment Instrumentation Spontaneous fission |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. :35-41 |
| ISSN: | 0168-9002 |
| DOI: | 10.1016/j.nima.2016.02.011 |
| Popis: | The VERDI spectrometer (VElocity foR Direct mass Identification) is a two arm time-of-flight spectrometer built at the European Commission Joint Research Centre IRMM. It determines fragment masses and kinetic energy distributions produced in nuclear fission by means of the double velocity and double energy (2v–2E) method. The simultaneous measurement of pre- and post neutron fragment characteristics allows studying the share of excitation energy between the two fragments. In particular, the evolution of fission modes and neutron multiplicity may be studied as a function of the available excitation energy. Both topics are of great importance for the development of models used in the evaluation of nuclear data, and also have important implications for the fundamental understanding of the fission process. The development of VERDI focus on maximum geometrical efficiency while striving for highest possible mass resolution. An innovative transmission start detector, using electrons ejected from the target itself, was developed. Stop signal and kinetic energy of both fragments are provided by two arrays of silicon detectors. The present design provides about 200 times higher geometrical efficiency than that of the famous COSI FAN TUTTE spectrometer [Nuclear Instruments and Methods in Physics Research 219 (1984) 569]. We report about a commissioning experiment of the VERDI spectrometer, present first results from a 2v-2E measurement of 252Cf spontaneous fission and discuss the potential of this instrument to contribute to the investigation prompt fission neutron characteristics as a function of fission fragment properties. |
| Databáze: | OpenAIRE |
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