1,* 2 3 1 1 1 2 1 1 1 2 3 l p n p p - n X 2+ p n p 2 2 2 p n p n n p p μ μ μ p (3 5) × 10 8 -2 ×10 19 -3 (2 3) × 10 17 -3 p 3 22 ◦ p p ◦ p