Neutron decay in free space is given as follo | vedclass

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(C) In the process of beta decay of a free neutron,the reaction is given by $_0n^1 	o _1p^1 + _{-1}e^0 + \bar{
u}_e$.$1$. Charge conservation: The t

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antineutrino

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(C) In the process of beta decay of a free neutron,the reaction is given by $_0n^1 	o _1p^1 + _{-1}e^0 + \bar{
u}_e$.$1$. Charge conservation: The total charge on the left is $0$. On the right,we have $(+1) + (-1) + 0 = 0$. Charge is conserved.$2$. Lepton number conservation: The neutron has a lepton number of $0$. The proton has $0$,the electron has $+1$. To make the total lepton number on the right side $0$,we must include a particle with a lepton number of $-1$,which is the antineutrino $(\bar{
u}_e)$.$3$. Spin conservation: The antineutrino is also required to conserve the spin angular momentum of the system.

Neutron decay in free space is given as follows:
$_0n^1 \to _1H^1 + _{-1}e^0 + [\,\,]$
Then the particle in the bracket is:

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Neutron decay in free space is given as follows:$_0n^1 \to _1H^1 + _{-1}e^0 + [\,\,]$Then the particle in the bracket is: