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view source for beta decay wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in view source for beta decay add languages article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file page information get shortened url switch to legacy parser in other projects wikidata item appearance move to sidebar hide beta decay you do not have permission to edit this page for the following reason this ip address range has been globally blocked this does not affect your ability to read wikipedia pages most people who see this message have done nothing wrong some kinds of blocks restrict editing from specific service providers or telecom companies in response to recent abuse or vandalism and can sometimes affect other users who are unrelated to that abuse review the information below for assistance if you do not believe that you have done anything wrong this block affects editing on all wikimedia wikis the ip address or range 5 135 0 0 16 has been globally blocked by jon kolbert for the following reason s open proxy webhost visit the faq if you are affected this block will expire on 04 29 8 january 2027 your current ip address is 5 135 42 194 even while globally blocked you will usually still be able to edit pages on meta wiki if you believe you were blocked by mistake you can find additional information and instructions in the stewards block wizard other useful links global blocks help i have been blocked you can view and copy the source of this page electron capture k capture l capture main electron capture file electron capture svg alt leading order ec feynman diagrams thumb 309x309px the leading order feynman diagram s for electron capture decay an electron interacts with an up quark in the nucleus via a w and z bosons w boson to create a down quark and electron neutrino two diagrams comprise the leading second order though as a virtual particle the type and charge of the w boson is indistinguishable in all cases where subatomicparticle beta decay positron emission of a nucleus is allowed energetically so too is electron capture allowed this is a process during which a nucleus captures one of its atomic electrons resulting in the emission of a neutrino physics particle tl mvar a bl mvar z x subatomicparticle electron physics particle tl mvar a bl math z 1 x math subatomicparticle electron neutrino capture of a free electron is allowed but physical conditions make this generally negligible outside stars ref cite journal last bahcall first john n date january 1964 title electron capture in stellar interiors url http adsabs harvard edu doi 10 1086 147755 journal the astrophysical journal language en volume 139 page 318 doi 10 1086 147755 bibcode 1964apj 139 318b issn 0004 637x archive date 2018 06 10 access date 2025 08 08 archive url https web archive org web 20180610054358 http adsabs harvard edu doi 10 1086 147755 url status live ref an example of electron capture is one of the decay modes of krypton 81 into bromine 81 nuclide krypton 81 subatomic particle electron nuclide bromine 81 math subatomic particle electron neutrino all emitted neutrinos are of the same energy in proton rich nuclei where the energy difference between the initial and final states is less than 2 math m sub e sub c sup 2 sup subatomicparticle beta decay is not energetically possible and electron capture is the sole decay mode ref name zuber if the captured electron comes from the innermost electron shell of the atom called the k shell it is called k capture if it comes from the second or l shell the process is called l capture and so on with higher level labels increasing with the alphabet ref name jevremovic2009 cite book last jevremovic first t url https books google com books id tem9tcfae7ec pg pa201 title nuclear principles in engineering publisher springer science business media year 2009 isbn 978 0 387 85608 7 page 201 ref electron capture is a competing simultaneous decay process for all nuclei that can undergo β sup sup decay the converse however is not true electron capture is the only type of decay that is allowed in proton rich nuclides that do not have sufficient energy to emit a positron and neutrino ref name zuber cite book last zuber first k title neutrino physics publisher crc press year 2011 isbn 978 1 4200 6471 1 edition 2nd page 466 ref return to beta decay retrieved from https en wikipedia org wiki beta_decay privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search view source for beta decay add languages add topic