Properties of neutron emission in fission processes induced by 20Ne+ 159Tb and 20Ne+ 169Tm reactions between E=8 and 16 MeV/nucleon

Th Keutgen; J. Cabrera; Y. El Masri; Ch Dufauquez; V. Roberfroid; I. Tilquin; A. Ninane; J. Van Mol; R. Régimbart; R. J. Charity; J. B. Natowitz; K. Hagel; R. Wada; D. J. Hinde

doi:10.1103/PhysRevC.70.014611

Properties of neutron emission in fission processes induced by ²⁰Ne+ ¹⁵⁹Tb and ²⁰Ne+ ¹⁶⁹Tm reactions between E=8 and 16 MeV/nucleon

Th Keutgen^*, J. Cabrera, Y. El Masri, Ch Dufauquez, V. Roberfroid, I. Tilquin, A. Ninane, J. Van Mol, R. Régimbart, R. J. Charity, J. B. Natowitz, K. Hagel, R. Wada, D. J. Hinde

^*Corresponding author for this work

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Abstract

Neutron emission in E=8. 10, 13, and 16 MeV/nucleon ²⁰Ne+ ¹⁵⁹Tb, ¹⁶⁹Tm induced fission reactions has been further studied. The 4π configuration of the DEMON neutron multidetector allowed a detailed investigation of the pre- and postscission properties as functions of the fission parameters. The emission of the neutrons from their respective sources was found to be isotropic to a high degree. The determination of the compound-nucleus recoil velocity and the kinetic-energy release in fission suffers from smearing due to the recoil kicks imparted by the evaporated pre- and postscission light particles. Attempts to gate on these quantities lead to biases in the emission patterns of the evaporated neutrons. Specifically, with such gates, the assumption of isotropic emission is violated and attempts to analyze such gated neutron spectra with the standard fitting technique, which assumes isotropy, lead to spurious results. All these effects are clearly illustrated in this work.

Original language	English
Article number	014611
Pages (from-to)	014611-1-014611-13
Journal	Physical Review C - Nuclear Physics
Volume	70
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.70.014611
Publication status	Published - Jul 2004

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Keutgen, T., Cabrera, J., El Masri, Y., Dufauquez, C., Roberfroid, V., Tilquin, I., Ninane, A., Van Mol, J., Régimbart, R., Charity, R. J., Natowitz, J. B., Hagel, K., Wada, R., & Hinde, D. J. (2004). Properties of neutron emission in fission processes induced by ²⁰Ne+ ¹⁵⁹Tb and ²⁰Ne+ ¹⁶⁹Tm reactions between E=8 and 16 MeV/nucleon. Physical Review C - Nuclear Physics, 70(1), 014611-1-014611-13. Article 014611. https://doi.org/10.1103/PhysRevC.70.014611

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title = "Properties of neutron emission in fission processes induced by 20Ne+ 159Tb and 20Ne+ 169Tm reactions between E=8 and 16 MeV/nucleon",

abstract = "Neutron emission in E=8. 10, 13, and 16 MeV/nucleon 20Ne+ 159Tb, 169Tm induced fission reactions has been further studied. The 4π configuration of the DEMON neutron multidetector allowed a detailed investigation of the pre- and postscission properties as functions of the fission parameters. The emission of the neutrons from their respective sources was found to be isotropic to a high degree. The determination of the compound-nucleus recoil velocity and the kinetic-energy release in fission suffers from smearing due to the recoil kicks imparted by the evaporated pre- and postscission light particles. Attempts to gate on these quantities lead to biases in the emission patterns of the evaporated neutrons. Specifically, with such gates, the assumption of isotropic emission is violated and attempts to analyze such gated neutron spectra with the standard fitting technique, which assumes isotropy, lead to spurious results. All these effects are clearly illustrated in this work.",

author = "Th Keutgen and J. Cabrera and {El Masri}, Y. and Ch Dufauquez and V. Roberfroid and I. Tilquin and A. Ninane and {Van Mol}, J. and R. R{\'e}gimbart and Charity, {R. J.} and Natowitz, {J. B.} and K. Hagel and R. Wada and Hinde, {D. J.}",

year = "2004",

month = jul,

doi = "10.1103/PhysRevC.70.014611",

language = "English",

volume = "70",

pages = "014611--1--014611--13",

journal = "Physical Review C - Nuclear Physics",

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publisher = "American Physical Society",

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Keutgen, T, Cabrera, J, El Masri, Y, Dufauquez, C, Roberfroid, V, Tilquin, I, Ninane, A, Van Mol, J, Régimbart, R, Charity, RJ, Natowitz, JB, Hagel, K, Wada, R & Hinde, DJ 2004, 'Properties of neutron emission in fission processes induced by ²⁰Ne+ ¹⁵⁹Tb and ²⁰Ne+ ¹⁶⁹Tm reactions between E=8 and 16 MeV/nucleon', Physical Review C - Nuclear Physics, vol. 70, no. 1, 014611, pp. 014611-1-014611-13. https://doi.org/10.1103/PhysRevC.70.014611

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T1 - Properties of neutron emission in fission processes induced by 20Ne+ 159Tb and 20Ne+ 169Tm reactions between E=8 and 16 MeV/nucleon

AU - Keutgen, Th

AU - Cabrera, J.

AU - El Masri, Y.

AU - Dufauquez, Ch

AU - Roberfroid, V.

AU - Tilquin, I.

AU - Ninane, A.

AU - Van Mol, J.

AU - Régimbart, R.

AU - Charity, R. J.

AU - Natowitz, J. B.

AU - Hagel, K.

AU - Wada, R.

AU - Hinde, D. J.

PY - 2004/7

Y1 - 2004/7

N2 - Neutron emission in E=8. 10, 13, and 16 MeV/nucleon 20Ne+ 159Tb, 169Tm induced fission reactions has been further studied. The 4π configuration of the DEMON neutron multidetector allowed a detailed investigation of the pre- and postscission properties as functions of the fission parameters. The emission of the neutrons from their respective sources was found to be isotropic to a high degree. The determination of the compound-nucleus recoil velocity and the kinetic-energy release in fission suffers from smearing due to the recoil kicks imparted by the evaporated pre- and postscission light particles. Attempts to gate on these quantities lead to biases in the emission patterns of the evaporated neutrons. Specifically, with such gates, the assumption of isotropic emission is violated and attempts to analyze such gated neutron spectra with the standard fitting technique, which assumes isotropy, lead to spurious results. All these effects are clearly illustrated in this work.

AB - Neutron emission in E=8. 10, 13, and 16 MeV/nucleon 20Ne+ 159Tb, 169Tm induced fission reactions has been further studied. The 4π configuration of the DEMON neutron multidetector allowed a detailed investigation of the pre- and postscission properties as functions of the fission parameters. The emission of the neutrons from their respective sources was found to be isotropic to a high degree. The determination of the compound-nucleus recoil velocity and the kinetic-energy release in fission suffers from smearing due to the recoil kicks imparted by the evaporated pre- and postscission light particles. Attempts to gate on these quantities lead to biases in the emission patterns of the evaporated neutrons. Specifically, with such gates, the assumption of isotropic emission is violated and attempts to analyze such gated neutron spectra with the standard fitting technique, which assumes isotropy, lead to spurious results. All these effects are clearly illustrated in this work.

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JO - Physical Review C - Nuclear Physics

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ER -

Properties of neutron emission in fission processes induced by ²⁰Ne+ ¹⁵⁹Tb and ²⁰Ne+ ¹⁶⁹Tm reactions between E=8 and 16 MeV/nucleon

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