The magnet is one of the main components of a cyclotron, used to form a circular particle beam trajectories and to provide focusing of the beam. To support the mastery of 13-MeV proton cyclotron technologies, cyclotron magnet design must be done to satisfy cyclotron magnet requirements. This research was conducted by studying important parameters in designing the cyclotron magnet which is then used to determine the design requirements. The magnet design was based on the results of a 3D simulation using Opera 3D software. Opera 3D is a software developed by Cobham plc to solve physical problems in 3D such as magnetostatic using finite element methods. The simulation started by drawing a 3D model of the magnet using a modeler, followed by magnetic field calculations by Tosca module in the Opera 3D software. Simulation results were analyzed with the Genspeo software to determine whether the parameters of the cyclotron magnet have met design requirements. The results indicate that the magnet design satisfied the cyclotron magnet design requirement, that B in the median plane of the magnetic pole approached the isochronous curve, providing axial and radial focusing beam, crossing the resonance line at v r = 1 when the particle energy is low and the particle energy is more than 13 MeV, and lead to small enough phase shift of about 13°. The dimension of the cyclotron magnet is 1.96 m × 1.30 m × 1.21 m; its weight is 17.3 ton; its coil current is 88,024 ampere-turn; its center magnetic field is 1.27479 T; its maximum magnetic field is 1.942116 T; its minimum magnetic field is 0.7689 T; its valley gap is 120 mm; its hill gaps are 40 to 50.78 mm; and its hill angles are 35° to 44°.

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<span>The interaction of two nucleons in the form of protons and neutrons as a bound system in the local <span>potential, known as the deuteron, has been investigated. Two-nucleon interaction potential field <span>through the core will produce a nuclear force where the force between nucleons is generated by the <span>exchange of mesons. One of the members of the group of meson particles is pion. Pion can be <span>charged<span><span><em>π </em><span>+ <span><em>,</em><span><em>π </em><span>-<span><span>or neutral,<span><span><em>π </em><span>0<span><span>. Interaction potential form of the simplest is the exchange of one <span>pion potential (OPEP), <span><em>V </em><span>OPEP <span>, which has a radially independent of Yukawa potential. <span>In this study, the first step taken is to perform discretization of the OPEP potential expression <span>coupled with the equation of the boundary conditions due to the influence of interaction distances. <span>The next step is to implement a programming technique to obtain the value associated with the <span>potential influence of OPEP in the deuteron, the magnitudes of the static deuteron, such as a pion <span>distance exchange, and mass estimates pion involved in this interaction.</span></span></span></span></span></span></span></span></span></span><br /></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>

A research of design of double layer collimator using 9 Be(p,n) neutron source has been conducted. The research objective is to design a double layer collimator to obtain neutron sources that are compliant with the IAEA standards. The approach to the design of double layer collimator used the MCNPX code. From the research, it was found that the optimum dimensions of a beryllium target are 0.01 mm in length and 9.5 cm in radius. Collimator consists of a D2O and Al moderator, Pb and Ni as a reflector, and Cd and Fe as a thermal and fast neutron filter. The gamma filter used Bi and Pb. The quality neutron beams emitted from the double layer collimator is specified by five parameters: epithermal neutron flux 1 ×10 9 n/cm 2 s; fast neutron dose per epithermal neutron flux 5 ×10 13 Gy cm 2 s; gamma dose per epithermal neutron flux 1×10 13 Gy cm 2 s; ratio of the thermal neutron flux of epithermal neutron flux 0; and the ratio of epithermal neutron current to total epithermal neutron 0.54.

We evaluate the predictive power of the neutrino mass matrices arising from seesaw mechanism with heavy Majorana mass matrices subject to texture zero and satisfy a cyclic permutation invariant form to the solar neutrino mixing phenomena. From eight possible patterns of heavy Majorana neutrino mass matrix, we found that there is no heavy Majorana neutrino mass matrix to be invariant in form under a cyclic permutation. But, by imposing an additional assumption that at least one of the 2 × 2 sub-matrices of heavy Majorana neutrino mass matrix inverse having zero determinant, we found that only two of the eight possible patterns for heavy Majorana neutrino mass matrices to be invariant under a cyclic permutation. One of the two invariant heavy Majorana neutrino mass matrices could produces neutrino mass matrix M ν that can be used to explain the neutrino mixing phenomena for both solar and atmospheric neutrinos qualitatively.