The CORSET time-of-flight spectrometer for measuring binary products of nuclear reactions

Козулин, Э. М.; Bogachev, A. A.; Иткис, М. Г.; Itkis, I. M.; Knyazheva, G. N.; Kondratiev, N. A.; Крупа, Л.; Pokrovsky, I. V.; Прохорова, Е. В.

doi:10.1134/s0020441208010041

Cited by 85 publications

(65 citation statements)

References 23 publications

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“…Once again the SM calculations overestimate protons and alpha particle multiplicities in the ER channel. Excluding the alpha particle multiplicity for the 147, 9 Tb at E x = 194 MeV, which is essentially reproduced, we observe overestimations up to a factor of 5.5.…”

Section: E Vardaci Et Al: Inadequacy Of the Statistical Model: Somementioning

confidence: 76%

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Inadequacy of the statistical model: Some evidence for compound nuclei in the A $ \approx$ 150 and Ex $ \approx$ 100-200 MeV region

et al. 2009

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Abstract. Light charged-particle multiplicities in the evaporation residue (ER) and fission (FF) channels from the reaction 200 MeV 32 S + 100 Mo as well as ER and FF channel cross-sections have been measured and compared to the predictions of the statistical model (SM) to estimate the fission time scale. The statistical model fails in reproducing the whole set of data and no convincing estimate is possible. In particular, while pre-scission multiplicities can be reproduced, the model strongly overestimates proton and alpha particle multiplicities in the ER channel, irrespective of the SM input parameters and prescriptions used for the level density and the transmission coefficients. Same calculations performed on data from literature in the A ≈ 150 and excitation energy E x ≈ 100-200 MeV region, for the ER channel, provide similar conclusions. These findings repropose the problem of the reliability of the SM in describing the compound-nucleus decay and have a relevant impact on the extraction of the fission delay time through the use of the SM.

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Section: E Vardaci Et Al: Inadequacy Of the Statistical Model: Somementioning

confidence: 76%

“…Evaporation residues have been detected by means of four Parallel Plate Avalanche Counter modules. In a separate experiment the ER cross-section was measured by means of the electrostatic deflector of LNL [7] and the fission cross-section was measured with the double-arm time-of-flight spectrometer CORSET [8,9] at LNL as well.…”

Section: Introductionmentioning

confidence: 99%

Inadequacy of the statistical model: Some evidence for compound nuclei in the A $ \approx$ 150 and Ex $ \approx$ 100-200 MeV region

et al. 2009

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“…Evaporation residues have been detected by means of four Parallel Plate Avalanche Counter modules. In a separate experiment ER cross sections are measured by means of the electrostatic deflector of LNL [6] and fission cross sections are measured with the double-arm time-of-flight spectrometer CORSET [7] at LNL as well. We have measured most of the relevant quantities in the ER and FF channels: proton and α-particle energy spectra and multiplicities, ER and FF cross sections, and parameters of the fission fragment mass-energy distribution.…”

Section: Methodsmentioning

confidence: 99%

Nuclear dissipation effects on fission and evaporation in systems of intermediate fissility

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Brondi

Nitto

et al. 2010

EPJ Web of Conferences

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Abstract. The systems of intermediate fissility 132 Ce and 158 Er have been studied experimentally and theoretically in order to investigate the dissipation properties of nuclear matter. Cross sections of fusion-fission and evaporation residues channels together with charged particles multiplicities in both channels, their spectra, angular correlations and mass-energy distribution of fission fragments have been measured. Theoretical analysis has been performed using multi-dimensional stochastic approach with realistic treatment of particle evaporation. The results of analysis show that full one-body or unusually strong two-body dissipation allows to reproduce experimental data. No temperature dependent dissipation was needed.

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“…In the same experiment the angular distribution of the FF was measured with a TOF-E spectrometer based on the CORSET setup [20]. The spectrometer consists of an arm that can be mounted inside the scattering chamber at various angles with respect to the beam direction and that allows to measure simultaneously the velocity (via the time of flight) and the energy of a fragment.…”

Section: Fission Fragments Cross-section Measurementmentioning

confidence: 99%

Evaporation and fission decay of 132Ce compound nuclei at Ex=122 MeV: some limitations of the statistical model

et al. 2011

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Abstract. Light charged particle (LCP) emission in the evaporation residue (ER) and fusion fission (FF) channels have been studied for the 200 MeV32 S+ 100 Mo reaction, leading to 132 Ce composite nuclei at Ex=122 MeV. The main goal was to study the decay of 132 Ce on the basis of an extended set of observables, to get insights on the fission dynamics. The proton and alpha particle energy spectra, their multiplicities, ER-LCP angular correlations, ER and FF angular distributions, and ER and FF crosssections were measured. The measured observables were compared with the Statistical Model (SM). Using standard parameters, the model was able to reproduce only the pre-scission multiplicities and the FF and ER cross-sections. The calculation was observed to strongly overestimate the proton and alpha particle multiplicities in the ER channel. Disagreements were also observed for the ER-LCP correlations, the LCP energy spectra and the ER angular distribution. By varying the SM input parameters over a wide range of values, it is shown that it is not possible to reproduce all the observables simultaneously with a unique set of parameters. The inadequacy of the model in reproducing the ER particle multiplicities is also observed analysing data from the literature for other systems in the A ≈ 150 and E x ≈ 100-200 MeV region. These results indicate serious limitations about the use of the SM in extracting information on fission dynamics.

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The CORSET time-of-flight spectrometer for measuring binary products of nuclear reactions

Cited by 85 publications

References 23 publications

Inadequacy of the statistical model: Some evidence for compound nuclei in the A $ \approx$ 150 and Ex $ \approx$ 100-200 MeV region

Inadequacy of the statistical model: Some evidence for compound nuclei in the A $ \approx$ 150 and Ex $ \approx$ 100-200 MeV region

Nuclear dissipation effects on fission and evaporation in systems of intermediate fissility

Evaporation and fission decay of 132Ce compound nuclei at Ex=122 MeV: some limitations of the statistical model

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