Physics Help Forum Beta decay

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 Oct 24th 2014, 05:08 PM #1 Senior Member   Join Date: Jun 2014 Posts: 306 Beta decay from the physics fact in the photo, i know that the daughter nucleus is a positive ion.... but , referring to the part 2 , finding the mass loss in beta decay in terms of atomic mass , it says that A_(z+1) Y has extra one orbitting electron comapred to the parent nucleus. this is contrary to the physics fact above..... A_(z+1) Y is atom with proton number and number of electron = Z+1 or A_(z+1) Y is a positive nucleus ? Attached Thumbnails
 Oct 24th 2014, 05:35 PM #2 Senior Member   Join Date: Jun 2014 Posts: 306 and i dont understand part 2 ) , why the mass defect is mx -(my-me) -me ? the extra orbittin elc\ectron mass is already deducted in the last part -me am i right? why the mass of elctron is deducted again in ( my[COLOR="rgb(255, 0, 255)"]-me[/COLOR] )?
Oct 25th 2014, 02:02 PM   #3

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 Originally Posted by ling233 from the physics fact in the photo, i know that the daughter nucleus is a positive ion.... but , referring to the part 2 , finding the mass loss in beta decay in terms of atomic mass , it says that A_(z+1) Y has extra one orbitting electron comapred to the parent nucleus. this is contrary to the physics fact above..... A_(z+1) Y is atom with proton number and number of electron = Z+1 or A_(z+1) Y is a positive nucleus ?
The process of beta decay changes a neutron into a proton and electron. In the decay the daughter nucleus is not considered to be electrically neutral...it must be a positive ion. So I don't understand the highlighted comment either.

-Dan
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Last edited by topsquark; Oct 25th 2014 at 02:06 PM.

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