Impact of prompt-neutron corrections on final fission-fragment distributions

↓ Direkt till sidans innehåll
↓ Direkt till sidans sekundära innehåll (sidomenyn)

Sökning: WFRF:(Stephan Pomp) > Impact of prompt-ne...

Al-Adili, AliUppsala universitet,Tillämpad kärnfysik (författare)

Impact of prompt-neutron corrections on final fission-fragment distributions

Artikel/kapitelEngelska2012

Förlag, utgivningsår, omfång ...

2012
printrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:uu-185076
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-185076URI
https://doi.org/10.1103/PhysRevC.86.054601DOI

Kompletterande språkuppgifter

Språk:engelska
Sammanfattning på:engelska

Ingår i deldatabas

SwePubSwePub

Klassifikation

Ämneskategori:ref swepub-contenttype
Ämneskategori:art swepub-publicationtype

Anmärkningar

Background: One important quantity in nuclear fission is the average number of prompt neutrons emitted from the fission fragments, the prompt neutron multiplicity, ν . The total number of prompt fission neutrons, νtot, increases with increasing incident neutron energy. The prompt-neutron multiplicity is also a function of the fragment mass and the total kinetic energy of the fragmentation. Those data are only known in sufficient detail for a few thermal-neutron-induced fission reactions on, for example, 233,235U and 239Pu. The enthralling question has always been asked how the additional excitation energy is shared between the fission fragments. The answer to this question is important in the analysis of fission-fragment data taken with the double-energy technique. Although in the traditional approach the excess neutrons are distributed equally across the mass distribution, a few experiments showed that those neutrons are predominantly emitted by the heavy fragments.Purpose: We investigated the consequences of the ν(A,TKE,En) distribution on the fission fragment observables.Methods: Experimental data obtained for the 234U(n, f) reaction with a Twin Frisch Grid Ionization Chamber, were analyzed assuming two different methods for the neutron evaporation correction. The effect of the two different methods on the resulting fragment mass and energy distributions is studied.Results: We found that the preneutron mass distributions obtained via the double-energy technique become slightly more symmetric, and that the impact is larger for postneutron fission-fragment distributions. In the most severe cases, a relative yield change up to 20–30% was observed.Conclusions: We conclude that the choice of the prompt-neutron correction method has strong implications on the understanding and modeling of the fission process and encourages new experiments to measure fission fragments in coincidence with prompt fission neutrons. Even more, the correct determination of postneutron fragment yields has an impact on the reliable assessment of the nuclear waste inventory, as well as on the correct prediction of delayed neutron precursor yields.

Ämnesord och genrebeteckningar

NATURVETENSKAP Fysik Subatomär fysik hsv//swe
NATURAL SCIENCES Physical Sciences Subatomic Physics hsv//eng
Fission
Neutron
Fysik med inriktning mot tillämpad kärnfysik
Physics with specialization in Applied Nuclear Physics

Biuppslag (personer, institutioner, konferenser, titlar ...)

Hambsch, Franz-JosefIRMM - JRC - EC (författare)
Stephan, PompUppsala universitet,Tillämpad kärnfysik(Swepub:uu)steppomp (författare)
Stephan, OberstedtIRMM - JRC - EC (författare)
Uppsala universitetTillämpad kärnfysik (creator_code:org_t)

Sammanhörande titlar

Ingår i:Physical Review C. Nuclear Physics86:5, s. 054601-0556-28131089-490X

Internetlänk

Hitta via bibliotek

Physical Review C. Nuclear Physics (Sök värdpublikationen i LIBRIS)

Till lärosätets databas

Hitta mer i SwePub

Av författaren/redakt...: Al-Adili, Ali; Hambsch, Franz-J ...; Stephan, Pomp; Stephan, Oberste ...

Om ämnet

NATURVETENSKAP: NATURVETENSKAP; och Fysik; och Subatomär fysik

Artiklar i publikationen: Physical Review ...

Av lärosätet: Uppsala universitet

Sök utanför SwePub

Sök vidare i:: Google; Google Book Search; Google Scholar

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

LIBRIS.kb.se