YUNIARTI, S.; HARYADI, A.; ABDULLATIF, R. THE EFFECT OF THICKNESS VARIATION OF BERYLLIUM TARGET TOWARD CHARACTERISTICS OF NEUTRON ENERGY SPECTRUM ON CYCLOTRONS HM-30 USING MCNP-X. Indonesian Journal of Physics and Nuclear Applications, v. 2, n. 3, p. 137-143, 30 out. 2017.