We develop a nucleon-nucleon (NN) potential based upon chiral perturbation theory at next-to-next-to-leading order (N

The atomic nucleus was discovered by Rutherford in the year of 1911 by demonstrating that large-angle alpha-particle scattering can only be described in terms of a positively charged nucleus with a very small radius. Then, Thomson studied the nuclear mass and discovered the existence of isotopes. The first nuclear models employed protons and electrons with only electrostatic forces to construct a nucleus. In 1932, the neutron was discovered by Chadwick. This suggested that the neutron and the proton were the basic constituents of nuclei. Furthermore, one had to consider the existence of a new force between neutrons and protons to bind the nucleus, which was called the nuclear force or the strong force.

In the next phase, Wigner concluded that the nuclear force had to be of short range and strong within that range. Heisenberg and Majorana theoretically discussed the new forces and introduced the concept of "exchange forces" to explain nuclear saturation. Around this period, experiment also made big progress, such as measuring the binding energy of the deuteron and conducting proton-proton scattering experiments. Heisenberg already indicated that the neutron and proton can be recognized as two states of the same particle. The concept of isospin was introduced by Cassen and Condon in 1936.

The first fundamental idea for the origin of the nuclear force was created by Yukawa in 1935. He assumed that nucleons interact via the exchange of massive scalar particles. This creates a potential, which is proportional to

The first modifications of Yukawa's theory were extensions of his model to pseudoscalar and pseudovector particles by Proca and Kemmer. The quadrupole moment and the magnetic moment of the deuteron were measured by Kellog, Rabi, Ramsey, and Zacharias in 1939. Møller, Rosenfeld, and Schwinger derived a tensor force giving rise to the quadrupole moment by employing both pseudoscalar and vector fields. In 1946, Pauli predicted the existence of an isovector pseudoscalar meson because the exchange of a particle with these quantum numbers could explain the sign of the quadrupole moment. The predicted particle, which was called pion or

In 1951, Taketani, Nakamura, and Sasaki introduced the concept of subdividing the nuclear force into three regions. They classified a long-range (

In the 1950's, OPE became well established for the long-range part of the nuclear interaction. Besides that, theoreticians paid considerable attention to the TPE contribution. Taketani, Machida, and Onuma evaluated an

In 1960, Breit and others revived the old idea of vector-meson exchange. Soon after, the vector mesons ρ and ω were discovered. ρ and ω are 2

To further develop the meson theory of nuclear force, dispersion relations and field theoretical approaches were used. The most elaborated work applying dispersion relations was done by the Stony Brook and the Paris groups. Lomon et. al. used the field-theoretic approach and calculated the Feynman diagrams of the 2-

The Bonn group developed one of most elaborate models within the meson-exchange concept. Holinde, Machleidt, and Elster calculated two- and some of the three- and four-pion exchange diagrams and extended the model to take the effects of virtual isobar excitations into account. The Bonn-potential accurately agrees with the NN scattering data. Some interesting attempts were performed by the Jülich group to incorporate also correlated meson exchanges.

The Nijmegen group constructed OBE potentials, and performed a partial-wave analysis (PWA) of

There is another high-quality NN force that is called Charge-Dependent Bonn (CD-Bonn) potential based on the relativistic OBE model. It includes nonlocality which increases the triton binding energy.

The Argonne group used a more phenomenological approach. For the long range, they use one-pion exchange, and for the short-range phenomenology. This NN potential includes charge-dependence, and charge-asymmetry, as does the CD-Bonn.

There are off-shell differences between different NN potentials. Because of the off-shell ambiguity, the binding energy of the triton varies remarkably when calculations are executed with different two-nucleon forces. The missing binding energy is, generally, attributed to three-nucleon forces. There is a good review article about three-nucleon physics.

There are several models for the three-nucleon force. The Fujita-Miyazawa and the Tucson-Melbourne forces are based upon two-pion exchange with one intermediate

Despite a very successful description of most of the experimental data, the meson-exchange based NN potentials are essentially phenomenological models because mesons are not fundamental particles. Moreover, the models use a fictitious σ boson. It is needed to produce the strong attraction in the central part of the potential. However, the existence of such a meson is controversial. In addition, form factors are applied, which are not well-defined in quantum field theory. Those are

There may also be conceptual problems with the meson exchange picture. Simply put, assuming that the hadrons are hard spheres, the typical size of a light meson is about 0.5 fm, which is almost the charge radius of a proton. The meson will not be able to fit between nucleons. This may suggest that the model is adequate only for distance of more than 2

A more fundamental approach to the nuclear force would start from QCD. QCD is believed to be the fundamental theory of strong interactions. It is an

The Moscow (Russia) NN potential is a hybrid model. The long-range interaction is described in terms of meson-exchanges. At short-range, one-gluon exchange and confinement interactions are considered. Several QCD-inspired quantitative quark models have been constructed for the nuclear force. More details can be found in the review article.

A QCD-based approach that uses the concept of an effective field theory (EFT) was suggested some 20 years ago by Weinberg. One writes down the most general Lagrangian that observes the (broken) chiral symmetry of QCD and all the other symmetries, and uses pions and nucleons as the effective degrees of freedom. This is called chiral effective field theory. Although applying the Lagrangian to NN scattering generates an infinite number of Feynman diagrams, Weinberg gave an idea of the systematic expansion of the amplitude in terms of a momentum or pion mass, with 1

Following this philosophy, the Texas-Seattle group obtained an energy dependent two-nucleon potential in r-space at next-to-next-to-leading order (N

CHPT applied to the NN system has also been used by several other researchers. Kaiser, Brockmann, and Weise presented the first model-independent prediction for the NN amplitudes of peripheral partial waves at N

The purpose of this thesis is to construct an NN potential based upon effective field theory in configuration space. Chiral NN potentials in momentum space have been constructed by other researchers, such as Epelbaum, Glockle, and Meissner, and Entem and Machleidt. However, many microscopic nuclear structure calculations are conducted in configuration space (

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