No, alpha particles are not considered to be in a "true" bound state in the context of quantum mechanics.
An alpha particle is a helium-4 nucleus, consisting of two protons and two neutrons. In certain nuclear reactions or decays, an alpha particle can be emitted or captured by a nucleus. While the alpha particle is bound within the nucleus, it is not considered to be in a stable bound state as described by quantum mechanics.
In quantum mechanics, a bound state typically refers to a system where a particle or particles are trapped within a potential well, such as an atom or a molecule. In these cases, the particles are confined by the attractive forces within the system. For example, in an atom, electrons are in bound states due to the electrostatic attraction between the negatively charged electrons and the positively charged nucleus.
In contrast, the alpha particle is not confined by a potential well within a single nucleus. It can be emitted or captured by a nucleus, but it is not a stable configuration in the same sense as bound states within atoms or molecules.
However, it is important to note that alpha particles can still exhibit quantum mechanical behavior, such as wave-particle duality, and their interactions with other particles can be described using quantum mechanics.