详细计算了光电子与衰变光子辐射方向之间的角度关系的显式表示。
The explicit expression for the angular relation between the direction of photoelectron and decay radiation is calculated in detail.
而且，在弱相互作用重粒子衰变成超级弱相互作用重粒子过程中，应该产生光子和电子等副产品，并且这些粒子也会与质量较轻的原子核发生碰撞，将它们撞碎。
In addition, the decay from WIMP to super-WIMP should have produced photons or electrons as a by-product, and these particles can smash into light nuclei and break them apart.
轴子很轻，它不会在自由空间中衰变成两个光子。
The axion is so light that it doesn't decay into two photons in free space.
轴子很轻，它不会在自由空间中衰变成两个光子。
The axion is so light that it doesn't decay into two photons in free space.
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