A neutron-activated sample emits gamma rays at energies that...

A neutron-activated sample emits gamma rays at energies that are consistent with the decay of mercury-198 nuclei from an excited state to the ground state. If the reaction that takes place is$\mathrm{n}+(?) \rightarrow{ }^{198} \mathrm{Hg}^{*}+\mathrm{e}^{-}+\bar{v},$ what is the nuclide "(?)" that was present in the sample before neutron activation? ( $\mathrm{W}$, tutorial: neutron detector)

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Key Concepts

Beta Decay

Beta decay is a type of radioactive decay in which a nucleus emits a beta particle (an electron or positron) along with an associated neutrino or antineutrino. This process typically involves the transformation of a neutron into a proton (or vice versa), thereby changing the atomic number of the nucleus while leaving its mass number unchanged.

Neutron Capture

Neutron capture is a fundamental nuclear process where a nucleus absorbs a free neutron, increasing its mass number. This absorption can leave the nucleus in an excited state, often triggering subsequent transformations, such as radioactive decay, to reach a more stable configuration.

Neutron Activation

Neutron activation is a technique in which stable isotopes are converted into radioactive ones by bombarding them with neutrons. This method is widely used in analytical chemistry and nuclear physics to trace elements, study nuclear reactions, and induce specific transmutations in materials.

Conservation of Mass Number in Nuclear Reactions

Conservation of mass number is a key principle in nuclear reactions, ensuring that the total number of nucleons (protons plus neutrons) remains constant during the reaction. This concept is essential for deducing the identity of unknown nuclei in reaction equations by balancing the mass numbers on both sides.

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