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# Engineering

Given the masses of various atomic particles m_{p}=1.0072\; u, m_{n}=1.0087 \; u,m_{e}=0.000548\; u, m_{v}^{-}=0,m_{d}=2.0141\; u, where \\p\equiv proton,n\equiv neutron,e\equiv electron, \bar{v}\equiv antineutrino\; \; and\; \; d\equiv deuteron. Which of the following process is allowed by momentum and energy conservation ?
Option: 1 n+n\rightarrow deuterium atom (electron bound to the nucleus)
 
Option: 2 p\rightarrow n+e^{+}+\bar{v}
Option: 3 n+p\rightarrow d+\gamma  
Option: 4 e^{+}+e^{-}\rightarrow \gamma

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