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For example, the in- trinsic spin of a nucleon is i and that of a A-particle is. In relativistic quantum mechanics, this implies a transformation between a particle and its antiparticle, hence the name particle-antiparticle transformation. The building blocks of nuclei are neutrons and protons, two aspects, or quantum states, of the same particle, the nucleon.

Introductory Nuclear Physics, by S.M. Wong – PDF Drive

The wavelength of visible light, on the other hand, is much longer, on the order of 10 -7 m. For a nucleon it is easily seen that the wave functions given by Eqs. This comes, in part, because of the simple radial dependence of electromagnetic force, in contrast to that for strong interaction. Furthermore, the potential of future discoveries remains very promising. From the latest description of major projects to comprehensive data bases, the World Wide Web is now the source of choice.

The magnetic dipole moment of a nucleus arises from a combination of two different sources. Furthermore, there is no problem, as quarks do not exist freely and all the observed charges are in integer multiples of e. The intrinsic spin of A is and, hence, the intrinsic spin part of the wave function for the three w-quarks is also symmetric.

First, the introductody quark interaction is known to be very strong at energies of concern to us here. The masses, magnetic moments, and other properties of quarks are inferred from what we know of the properties of mesons and baryons see, e.

This implies that quarks must also have half-integer intrinsic spins. Since is invariant under a transformation among the three s.m.wng, its wave function must be a linear combination of uuddand sswith equal weight: The wave functions of the two isoscalar mesons, and 77 0are slightly more com- plicated and must be deduced using, for example, symmetry arguments.

Wong Chapter 1 Introduction Nuclear physics is the study of atomic nuclei. For example, the study of quark-gluon plasma in relativistic heavy-ion collisions involves both particle and nuclear physics. For the nucleons inside a e.m.wong, nuclear force is far stronger than that due to elec- tromagnetic interaction, as can be seen from the comparisons of the relative strengths, or coupling constants, made in Table Such a bag model, together with its many variants, has made impressive contributions in improving our understanding of the structure of hadrons and in linking the quark-quark interaction with the interaction between nucleons.


The study of sameul nuclei has historically given us many of the first insights into modern physics.

Full text of “Introductory Nuclear Physics Wong”

Consider as an example the following symmetrical wave function of two fermions: Unfor- tunately, changes are frequently made to these electronic addresses and the reader may have to do some search to find the physicss one if a particular URL is moved to a new location. To illustrate this point, we can rewrite the wave function in the following form by putting the s-quark always at the end: However, no such bound states have been observed. Before the discovery of the neutron, it was assumed that a nucleus is made of protons and electrons.

From a quantum mechanics point of view, nuclear structure studies, for the most part, may be classified as bound state problems. We shall define each one of them as they appear in the discussion.

Since a meson is made of a quark and an Table Since a proton and a neutron are just two different states of a nucleon, their intrinsic wave functions have the same parity. It is sometimes convenient to express nuclear masses in terms of the mass excess, A Z,N also referred to on occasions as mass defectdefined in the following manner: The various components of a spherical tensor of a given rank, e.

Here, instead of isospin, we are lowering the strangeness by replacing a d- quark with an s-quark.

Introductory Nuclear Physics, by S.M. Wong

For each proton number, there are usually one or more stable or long-lived nuclei, or isotopes, each having a different number of neutrons. For states that live on the order of 10 to 10 s, the width of its energy distri- bution F is sometimes used to characterize the lifetimes.

In addition to binding energy, the general trend of nuclear size shows also a simple dependence on nucleon number. Since the s-quark is an isoscalar quantity, the isospin of the wave function is determined by tr- end rf-quarks. Because they are completely symmetric in flavor, it is relatively simple to construct the quark wave functions. Because of its larger mass and its more recent discovery, the r-lepton has yet to enter nuclear physics studies.


The nine mesons may be separated into two groups. This is the c- or charm, quark, having a mass far greater than those of u, d, and s. The members of the octet together with their quark contents are shown in Fig.

Use of the nuclear magneton fi N as the unit avoids any explicit dependence in the appearance of the equation on the system of Fortunately c- and f-quarks are so much more massive than u- d- and s-quarks that they are important primarily in heavy hadrons.

Here, both a and A are considered as adjustable parameters to be determined by fitting to known data [53]. In particular, it shares common interest with elementary particle physics in many respects. Let us examine the symmetry of the isospin part of the wave function.

For this purpose, references to the literature are kept to a minimum. The particle therefore carries one unit of negative charge and, hence, the negative sign in the superscript. Antiprotons are created when a beam of high-energy protons strikes a hydrogen target.

This gives us the correct isospin structure of all four members of the A. The book is aimed at physics students in their final year of undergraduate or first year of graduate studies in nuclear physics. The electric charge of a nucleus is, without exception, some integer multiple of e, the absolute value of the charge on an electron. In general, only electrons and electron neutrinos are involved; occasionally muons may enter, such as in the case of a muonic atom where a muon replaces one of the electrons in the atom.

In most cases, it is possible to write the equations involving electromagnetism in a form independent of the system of units by making use of the fine structure constant a and by measuring charge in units of e, the absolute value of charge carried by an electron, and magnetic dipole moment in units of i Nthe nuclear magneton.