n the equation for nuclear decay p^1 →n^1 + x , the particle x represents a positively charged particle, typically a positron (e+) or beta plus particle (β⁺).

Proton: A proton cannot decay into another proton in this type of nuclear decay because it would violate conservation laws (such as charge).

In the equation of nuclear decay:

p1→n1+xp ^1 \rightarrow n^1 + xp1→n1+x

Where:

p^1 represents a proton,
n^1 represents a neutron.
x represents the emitted particle.

For a proton (p) to decay into a neutron (n), the process is typically a type of beta-plus (β⁺) decay. In beta-plus decay, a proton in the nucleus transforms into a neutron by emitting a positron (e⁺) and a neutrino.

So, the particle x is a positron (e⁺). The reaction can be represented as:

p1→n1+e+p^1 \rightarrow n^1 + e^+p1→n1+e+

Where the positron is the emitted particle, and the decay occurs in certain types of nuclear reactions or in the process of positron emission.

Electron: An electron is emitted in beta-minus (β⁻) decay, not in the transformation of a proton into a neutron.

Photon: A photon is a quantum of electromagnetic radiation, not a particle emitted in this decay process.

Gamma rays: Gamma rays are high-energy photons emitted in nuclear reactions but not in this specific decay equation. They usually occur after other nuclear transitions, not from proton to neutron decay.