Study of some characteristics of the thermal-neutron-induced sub-barrier fission of 231Pa, 232Th and 237Np

C. Wagemans; M. Asghar; P. D'hondt; A. J. Deruytter; A. Emsallem

doi:10.1016/0375-9474(77)90144-0

Study of some characteristics of the thermal-neutron-induced sub-barrier fission of ²³¹Pa, ²³²Th and ²³⁷Np

C. Wagemans, M. Asghar, P. D'hondt, A. J. Deruytter, A. Emsallem

Research output › peer-review

Abstract

Some characteristics of the thermal-neutron-induced fission of ²³¹Pa, ²³²Th and ²³⁷Np were studied using a highly pure thermal-neutron beam of the Grenoble High Flux Reactor. For the thermal-neutron-induced-fission cross section we obtained 20 ± 4 mb for ²³⁷Np, 19 ± 4 mb for ²³¹Pa and less than 2.5 μb for ²³²Th, in agreement with calculations based on a double humped fission barrier. We also determined a mean total fission fragment kinetic energy of 172.8 + 2.5 MeV for ²³⁷Np, which fits into the semi-empirical systematic of E ̄_K versus Z²/A^{case1 3}. Finally, we determined LRA/B ratios of (1.94±0.17) × 10^-3 for ²³⁷Np and (1.67±0.11) × 10^-3for ²³¹Pa, in disagreement with the theoretical predictions of Feather, but consistent with the semi-empirical systematic of Halpern.

Original language	English
Pages (from-to)	32-44
Number of pages	13
Journal	Nuclear Physics, Section A
Volume	285
Issue number	1
DOIs	https://doi.org/10.1016/0375-9474(77)90144-0
State	Published - 18 Jul 1977

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/0375-9474(77)90144-0

Cite this

@article{0b713d18992947e1a83d8acc17d0f70f,

title = "Study of some characteristics of the thermal-neutron-induced sub-barrier fission of 231Pa, 232Th and 237Np",

abstract = "Some characteristics of the thermal-neutron-induced fission of 231Pa, 232Th and 237Np were studied using a highly pure thermal-neutron beam of the Grenoble High Flux Reactor. For the thermal-neutron-induced-fission cross section we obtained 20 ± 4 mb for 237Np, 19 ± 4 mb for 231Pa and less than 2.5 μb for 232Th, in agreement with calculations based on a double humped fission barrier. We also determined a mean total fission fragment kinetic energy of 172.8 + 2.5 MeV for 237Np, which fits into the semi-empirical systematic of E{\= }K versus Z2/A case1 3. Finally, we determined LRA/B ratios of (1.94±0.17) × 10-3 for 237Np and (1.67±0.11) × 10-3for 231Pa, in disagreement with the theoretical predictions of Feather, but consistent with the semi-empirical systematic of Halpern.",

keywords = "Nuclear reactions",

author = "C. Wagemans and M. Asghar and P. D'hondt and Deruytter, {A. J.} and A. Emsallem",

year = "1977",

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doi = "10.1016/0375-9474(77)90144-0",

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journal = "Nuclear Physics, Section A",

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T1 - Study of some characteristics of the thermal-neutron-induced sub-barrier fission of 231Pa, 232Th and 237Np

AU - Wagemans, C.

AU - Asghar, M.

AU - D'hondt, P.

AU - Deruytter, A. J.

AU - Emsallem, A.

PY - 1977/7/18

Y1 - 1977/7/18

N2 - Some characteristics of the thermal-neutron-induced fission of 231Pa, 232Th and 237Np were studied using a highly pure thermal-neutron beam of the Grenoble High Flux Reactor. For the thermal-neutron-induced-fission cross section we obtained 20 ± 4 mb for 237Np, 19 ± 4 mb for 231Pa and less than 2.5 μb for 232Th, in agreement with calculations based on a double humped fission barrier. We also determined a mean total fission fragment kinetic energy of 172.8 + 2.5 MeV for 237Np, which fits into the semi-empirical systematic of E ̄K versus Z2/A case1 3. Finally, we determined LRA/B ratios of (1.94±0.17) × 10-3 for 237Np and (1.67±0.11) × 10-3for 231Pa, in disagreement with the theoretical predictions of Feather, but consistent with the semi-empirical systematic of Halpern.

AB - Some characteristics of the thermal-neutron-induced fission of 231Pa, 232Th and 237Np were studied using a highly pure thermal-neutron beam of the Grenoble High Flux Reactor. For the thermal-neutron-induced-fission cross section we obtained 20 ± 4 mb for 237Np, 19 ± 4 mb for 231Pa and less than 2.5 μb for 232Th, in agreement with calculations based on a double humped fission barrier. We also determined a mean total fission fragment kinetic energy of 172.8 + 2.5 MeV for 237Np, which fits into the semi-empirical systematic of E ̄K versus Z2/A case1 3. Finally, we determined LRA/B ratios of (1.94±0.17) × 10-3 for 237Np and (1.67±0.11) × 10-3for 231Pa, in disagreement with the theoretical predictions of Feather, but consistent with the semi-empirical systematic of Halpern.

KW - Nuclear reactions

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