The mechanism of the (n, 2n) reaction

Ádám, A.; Hraskó, P.; Pálla, G.; Quittner, P.

doi:10.1016/0029-5582(63)90112-3

Cited by 16 publications

(3 citation statements)

References 6 publications

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“…Between beryllium and fluorine, beryllium was chosen due to its markedly higher (α,n) reaction yield [39]. Atoms of bismuth-209 and beryllium-9 are also able to undergo neutron multiplication reactions such as the (n,2n) reaction to sustain the thermal neutron population in the reaction mixture [6,40,41]. This also has the added advantage of lowering the average neutron energy, as the neutron multiplication cross section is much larger for neutrons with energies in the MeV range.…”

Section: 1bismuth Salt Selection and Synthesismentioning

confidence: 99%

“…Thus, a chain reaction can be initiated in a mixture of atoms of bismuth-209 and light elements, using an initial neutron source to transmute the bismuth atoms into that of polonium, which would themselves emit high-energy alpha particles that impact the light elements, causing further neutron production. Furthermore, 209 Bi and 9 Be are also able to cause neutron multiplication via a (n, 2n) reaction with fast neutrons [6], increasing the neutron population of the system.…”

Section: Introductionmentioning

confidence: 99%

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Development of a Science Demonstration Laboratory in National University of Singapore

Lim

Sow

2019

The Phys. Educat.

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Science demonstrations are a good way of promoting, teaching and learning science. This is provided that there exists carefully crafted “software” and communication methods to go along with the hardware. During the past few years, we have developed a Science Demonstration Laboratory at NUS aiming to play an active role in science outreach, science communication and science education. Our approach has evolved from an initial “show-and-tell” model to a more engaging “minds-on” approach where participants are consistently required to make predictions of the outcomes of scientific phenomena before witnessing the demonstrations. We also learnt that the education and development of talented science educators and communicators are crucial to ensure and project the effectiveness of a “hands-on”, “minds-on” approach to science education.

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Section: 1bismuth Salt Selection and Synthesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a Science Demonstration Laboratory in National University of Singapore

Lim

Sow

2019

The Phys. Educat.

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“…Ashby et al have reported G ~, ~~ = 2 740 2200 mb [SI. A later investigation by Adam et al resulted in un,zn = 1 800 2200 mb [2]. They concluded that the disagreement between the values was due to the difference between the experimental methods: larger cross sections result from experiments insensitive to' the directions of the emerging neutrons.…”

Section: Introductionmentioning

confidence: 98%

Gamma-ray Lines from (n,2n) and (n,n') Reactions in Radiogenic and Natural Lead

Jönsson¹

1970

Phys. Scr.

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Discrete γ-ray lines emitted after (n,2n) and (n,n') reactions in radiogenic and natural lead at 15.5 MeV neutron energy have been studied. Differential 120° cross sections have been determined relative to the cross section for the ground state transition from the 4.44 MeV level of 12C populated through inelastic scattering. The (n,2n) and (n,n') contributions to the cross sections for the most dominant γ-ray lines in 206Pb and 207Pb have been separated. Upper and lower limits of the cross sections for (n,2n) and (n,n') reactions in lead are estimated. The results indicate that the statistical theory of nuclear reactions fails to give a correct description of neutron emission processes in lead at 15 MeV neutron energy.

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