By Pauling L.
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Extra info for A New Crystal for Wave-Length Measurements of Soft X-Rays
For lighter nuclei with A < ∼ 140, α-decay is energetically possible, but the energy released is extremely small. Therefore, their nuclear lifetimes are so long that decays are usually not observable. An example of a α-unstable nuclide with a long lifetime, 238 U, is shown in Fig. 7. Since uranium compounds are common in granite, uranium and its radioactive daughters are a part of the stone walls of buildings. They therefore contribute to the environmental radiation background. This is particularly true of the inert gas 222 Rn, which escapes from the walls and is inhaled into the lungs.
1. The dependence of the above terms on A is shown in Fig. 5. Pairing term. A systematic study of nuclear masses shows that nuclei are more stable when they have an even number of protons and/or neutrons. This observation is interpreted as a coupling of protons and neutrons in pairs. The pairing energy depends on the mass number, as the overlap of the wave functions of these nucleons is smaller, in larger nuclei. 8). 8). However, the details of nuclear structure which we will discuss later (mainly in Chap.
To resolve the constituents of a nucleon, the quarks, one has to penetrate deeply into the interior of the nucleon. For this purpose, beam momenta of many GeV/c are necessary (see Fig. 1). Inelastic scattering. In inelastic reactions (Fig. 1b): a + b → a + b∗ |→ c + d , part of the kinetic energy transferred from a to the target b excites it into a higher energy state b∗ . The excited state will afterwards return to the ground state by emitting a light particle (e. g. a photon or a π-meson) or it may decay into two or more diﬀerent particles.