���~���I���ƂP�‚̓d�q����Ȃ�~���I�j�E���́A���f���q�̌y�����ʑ̂ł���B�{�����ł̓~���I���X�s����]�^�ɘa�^���–@�i�ʂr�q�@�j�ɂ��A�Z���������z�E�f�iBN�j�ɐ��~���I���𒍓��������̃~���I�j�E���̐��������Ɠ��I�����𒲂ׂ��B�ϑ����ꂽ�~���I�j�E��������72���ł���A�O���t�@�C�g�i0���j�◧����BN�i��50���j���������B�܂��A�ɘa���ԑ��肩��A���̊i�q�ԃ~���I�j�E�����q�̓񎟌��ʎq�g�U���������ꂽ�B

We investigated the yield and dynamics of the muonium atom, which is a light isotope of hydrogen, in hexagonal BN using μSR measurements. We found a higher yield of 72% than that in graphite (0%) or cubic BN (about 50%). Two-dimensional quantum diffusion was suggested for the interstitial atom.