Sunit Hendrana
Research Centre for Physics-Indonesian Institute of Sciences
Indonesia

Erwin Erwin
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Riau
Indonesia

Krisman Krisman
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Riau
Indonesia

Syakbaniah Syakbaniah
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Riau
Indonesia

Isna’im Isna’im
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Riau
Indonesia

Yusmeri Yusmeri
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Riau
Indonesia

Neti Satria
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Riau
Indonesia

Tri Susilawati
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Riau
Indonesia

Sudirman Sudirman
Centre for Science and Technology of Advanced Materials - National Nuclear Energi Agency
Indonesia