spontaneous fission

collocation in English

meaningsofspontaneousandfission

These words are often used together. Click on the links below to explore the meanings. Or,see other collocations withfission.
spontaneous
adjective
uk
/spɒnˈteɪ.ni.əs/us
/spɑːnˈteɪ.ni.əs/
happening or done in a natural, often sudden way, without any planning or without ...
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fission
noun[U]
uk
/ˈfɪʃ.ən/us
/ˈfɪʃ.ən/
physicsspecialized
the process of dividing the nucleus of an atom, resulting in the release of a large amount of ...
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(Definition ofspontaneousandfissionfrom theCambridge English Dictionary© Cambridge University Press)

Examplesofspontaneous fission

These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
Most of these decay predominantly through alpha decay, but some undergospontaneousfission.
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One microgram (g) of californium-252 emits 2.3 million neutrons per second, an average of 3.7 neutrons perspontaneousfission.
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These occur when atoms react with natural neutrons (from cosmic rays,spontaneousfission, or other sources), or are bombarded directly with cosmic rays.
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This type of fission (calledspontaneousfission) is rare except in a few heavy isotopes.
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One possible neutron source is californium-252 which undergoesspontaneousfission.
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The size and cost of these neutron sources are also comparable tospontaneousfissionsources.
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All these isotopes are characterized by high rates ofspontaneousfission.
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For this reason, these elements undergospontaneousfission.
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A fourth decay by directspontaneousfissionwas also proposed.
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He was one of the discoverers ofspontaneousfission.
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After observing the five alpha decay events that generate dubnium-268,spontaneousfissionevents were observed with a long half-time.
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This further underwentspontaneousfissionwith a half-time of about 1.3 h.
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It is primarily artificial, only trace quantities existing in nature produced byspontaneousfissionor neutron capture by molybdenum.
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Naturally occurring technetium occurs as aspontaneousfissionproduct in uranium ore or by neutron capture in molybdenumores.
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Thorium-232 is the lightest primordial nuclide that has left evidence of undergoingspontaneousfissionin its minerals.
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The highspontaneousfissionrate of californium-252 was observed in these samples.
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In both cases, they were unable to detect anyspontaneousfissionfrom nuclei of bohrium.
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Finally, promethium can be formed in nature as a product ofspontaneousfissionof uranium-238.
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Element 41 (niobium) is theoretically unstable viaspontaneousfission, but this has never been detected.
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Cd - are absolutely stable (except, theoretically, tospontaneousfission).
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
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