Simultaneous measurement of neutron-induced fission and capture cross sections for 241Am at neutron energies below fission threshold

K. Hirose; K. Nishio; H. Makii; I. Nishinaka; S. Ota; T. Nagayama; N. Tamura; S. Goto; A. N. Andreyev; M. J. Vermeulen; S. Gillespie; C. Barton; A. Kimura; H. Harada; S. Meigo; S. Chiba; T. Ohtsuki

doi:10.1016/j.nima.2016.12.021

Simultaneous measurement of neutron-induced fission and capture cross sections for ²⁴¹Am at neutron energies below fission threshold

K. Hirose^*, K. Nishio, H. Makii, I. Nishinaka, S. Ota, T. Nagayama, N. Tamura, S. Goto, A. N. Andreyev, M. J. Vermeulen, S. Gillespie, C. Barton, A. Kimura, H. Harada, S. Meigo, S. Chiba, T. Ohtsuki

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Fission and capture reactions were simultaneously measured in the neutron-induced reactions of ²⁴¹Am at the spallation neutron facility of the Japan Proton Accelerator Research Complex (J-PARC). Data for the neutron energy range of E_n=0.1–20 eV were taken with the TOF method. The fission events were observed by detecting prompt neutrons accompanied by fission using liquid organic scintillators. The capture reaction was measured by detecting γ rays emitted in the deexcitation of the compound nuclei using the same detectors, where the prompt fission neutrons and capture γ rays were separated by a pulse shape analysis. The cross sections were obtained by normalizing the relative yields at the first resonance to evaluations or other experimental data. The ratio of the fission to capture cross sections at each resonance is compared with those from an evaluated nuclear data library and other experimental data. Some differences were found between the present values and the library/literature values at several resonances.

Original language	English
Pages (from-to)	133-138
Number of pages	6
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	856
DOIs	https://doi.org/10.1016/j.nima.2016.12.021
Publication status	Published - 1 Jun 2017

Keywords

Am
Neutron capture
Neutron-induced fission
Pulse shape analysis
Time-of-flight method

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Cite this

Hirose, K., Nishio, K., Makii, H., Nishinaka, I., Ota, S., Nagayama, T., Tamura, N., Goto, S., Andreyev, A. N., Vermeulen, M. J., Gillespie, S., Barton, C., Kimura, A., Harada, H., Meigo, S., Chiba, S., & Ohtsuki, T. (2017). Simultaneous measurement of neutron-induced fission and capture cross sections for ²⁴¹Am at neutron energies below fission threshold. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 856, 133-138. https://doi.org/10.1016/j.nima.2016.12.021

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title = "Simultaneous measurement of neutron-induced fission and capture cross sections for 241Am at neutron energies below fission threshold",

abstract = "Fission and capture reactions were simultaneously measured in the neutron-induced reactions of 241Am at the spallation neutron facility of the Japan Proton Accelerator Research Complex (J-PARC). Data for the neutron energy range of En=0.1–20 eV were taken with the TOF method. The fission events were observed by detecting prompt neutrons accompanied by fission using liquid organic scintillators. The capture reaction was measured by detecting γ rays emitted in the deexcitation of the compound nuclei using the same detectors, where the prompt fission neutrons and capture γ rays were separated by a pulse shape analysis. The cross sections were obtained by normalizing the relative yields at the first resonance to evaluations or other experimental data. The ratio of the fission to capture cross sections at each resonance is compared with those from an evaluated nuclear data library and other experimental data. Some differences were found between the present values and the library/literature values at several resonances.",

keywords = "Am, Neutron capture, Neutron-induced fission, Pulse shape analysis, Time-of-flight method",

author = "K. Hirose and K. Nishio and H. Makii and I. Nishinaka and S. Ota and T. Nagayama and N. Tamura and S. Goto and Andreyev, {A. N.} and Vermeulen, {M. J.} and S. Gillespie and C. Barton and A. Kimura and H. Harada and S. Meigo and S. Chiba and T. Ohtsuki",

year = "2017",

month = jun,

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doi = "10.1016/j.nima.2016.12.021",

language = "English",

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Hirose, K, Nishio, K, Makii, H, Nishinaka, I, Ota, S, Nagayama, T, Tamura, N, Goto, S, Andreyev, AN, Vermeulen, MJ, Gillespie, S , Barton, C, Kimura, A, Harada, H, Meigo, S, Chiba, S & Ohtsuki, T 2017, 'Simultaneous measurement of neutron-induced fission and capture cross sections for ²⁴¹Am at neutron energies below fission threshold', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 856, pp. 133-138. https://doi.org/10.1016/j.nima.2016.12.021

Simultaneous measurement of neutron-induced fission and capture cross sections for ²⁴¹Am at neutron energies below fission threshold. / Hirose, K.; Nishio, K.; Makii, H. et al.

In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 856, 01.06.2017, p. 133-138.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Simultaneous measurement of neutron-induced fission and capture cross sections for 241Am at neutron energies below fission threshold

AU - Hirose, K.

AU - Nishio, K.

AU - Makii, H.

AU - Nishinaka, I.

AU - Ota, S.

AU - Nagayama, T.

AU - Tamura, N.

AU - Goto, S.

AU - Andreyev, A. N.

AU - Vermeulen, M. J.

AU - Gillespie, S.

AU - Barton, C.

AU - Kimura, A.

AU - Harada, H.

AU - Meigo, S.

AU - Chiba, S.

AU - Ohtsuki, T.

PY - 2017/6/1

Y1 - 2017/6/1

N2 - Fission and capture reactions were simultaneously measured in the neutron-induced reactions of 241Am at the spallation neutron facility of the Japan Proton Accelerator Research Complex (J-PARC). Data for the neutron energy range of En=0.1–20 eV were taken with the TOF method. The fission events were observed by detecting prompt neutrons accompanied by fission using liquid organic scintillators. The capture reaction was measured by detecting γ rays emitted in the deexcitation of the compound nuclei using the same detectors, where the prompt fission neutrons and capture γ rays were separated by a pulse shape analysis. The cross sections were obtained by normalizing the relative yields at the first resonance to evaluations or other experimental data. The ratio of the fission to capture cross sections at each resonance is compared with those from an evaluated nuclear data library and other experimental data. Some differences were found between the present values and the library/literature values at several resonances.

AB - Fission and capture reactions were simultaneously measured in the neutron-induced reactions of 241Am at the spallation neutron facility of the Japan Proton Accelerator Research Complex (J-PARC). Data for the neutron energy range of En=0.1–20 eV were taken with the TOF method. The fission events were observed by detecting prompt neutrons accompanied by fission using liquid organic scintillators. The capture reaction was measured by detecting γ rays emitted in the deexcitation of the compound nuclei using the same detectors, where the prompt fission neutrons and capture γ rays were separated by a pulse shape analysis. The cross sections were obtained by normalizing the relative yields at the first resonance to evaluations or other experimental data. The ratio of the fission to capture cross sections at each resonance is compared with those from an evaluated nuclear data library and other experimental data. Some differences were found between the present values and the library/literature values at several resonances.

KW - Am

KW - Neutron capture

KW - Neutron-induced fission

KW - Pulse shape analysis

KW - Time-of-flight method

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DO - 10.1016/j.nima.2016.12.021

M3 - Article

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VL - 856

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EP - 138

JO - Nuclear instruments & methods in physics research section a-Accelerators spectrometers detectors and associated equipment

JF - Nuclear instruments & methods in physics research section a-Accelerators spectrometers detectors and associated equipment

SN - 0168-9002

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Hirose K, Nishio K, Makii H, Nishinaka I, Ota S, Nagayama T et al. Simultaneous measurement of neutron-induced fission and capture cross sections for ²⁴¹Am at neutron energies below fission threshold. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2017 Jun 1;856:133-138. doi: 10.1016/j.nima.2016.12.021