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during the beta decay when a neutron is converted to proton and electron , electron goes out of the nucleus.then how is the +ve charge balanced??????????????????????!!!!!!!!!!!!!!!!!!!!!

during the beta decay when a neutron is converted to proton and electron , electron goes out of the nucleus.then how is the 


+ve charge balanced??????????????????????!!!!!!!!!!!!!!!!!!!!! 

Grade:Upto college level

1 Answers

SAGAR SINGH - IIT DELHI
878 Points
13 years ago

Dear student,

Beta particles are electrons or positrons (electrons with positive electric charge, or antielectrons). Beta decay occurs when, in a nucleus with too many protons or too many neutrons, one of the protons or neutrons is transformed into the other. In beta minus decay, a neutron decays into a proton, an electron, and an antineutrino: n Æ p + e - +. In beta plus decay, a proton decays into a neutron, a positron, and a neutrino: p Æ n + e+ +n. Both reactions occur because in different regions of the Chart of the Nuclides, one or the other will move the product closer to the region of stability. These particular reactions take place because conservation laws are obeyed. Electric charge conservation requires that if an electrically neutral neutron becomes a positively charged proton, an electrically negative particle (in this case, an electron) must also be produced. Similarly, conservation of lepton number requires that if a neutron (lepton number = 0) decays into a proton (lepton number = 0) and an electron (lepton number = 1), a particle with a lepton number of -1 (in this case an antineutrino) must also be produced. The leptons emitted in beta decay did not exist in the nucleus before the decay–they are created at the instant of the decay.

 

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Sagar Singh

B.Tech, IIT Delhi

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