中子星一問

試想想電子和質子，一個是負電荷一個是正電荷，如果拿一支高能電子束射擊原子核，你想想會有甚麼發生？如果所有質量都變成能量，那聚核變還有甚麼效益可言？研究聚核變還有甚麼作為？所有人拿電子束射擊原子核就可以產生足夠的能量解決能源危機？
事實上，電子和質子相遇，只有電荷抵銷而質量變成中子。只有物質和反物質（例如：電子和反電子，質子和反質子）相遇才會相抵銷且變成光子將能量放走。
希望解答到你 ^^

2007-11-19 22:42:24 補充：
Neutron star is a star containing more than 1.3 solar masses of material compressed into a volume approximately 6 mi (10 km) in radius. Neutron stars are one of the end points of stellar evolution and are the final states of stars that begin their lives with considerably more mass than the Sun.

2007-11-19 22:43:24 補充：
If Einstein's theory of gravitation is the correct one, a neutron star with a mass larger than some limiting value will collapse catastrophically, because its internal pressure will be insufficient, and become a black hole.

2007-11-19 22:44:25 補充：
The exact value of this limiting mass is not known precisely, but lies between 3 and 5 solar masses.Measured values of masses of neutron stars in double star systems range from 1.4 to 1.8 solar masses. (1 solar mass equals 2.0 x 10^33 kg.)

因為中子星的重力太強，強大得足以壓縮電子和質子之間的斥力，而全部變成中子。而一般情況下〈非中子星的情況〉，斥力都是比重力大的，因此不會塌縮成中子。

順帶一提，中子星並不是由白矮星轉變而成，中子星的前身是大質量恒星產物，白矮星則是質量較小的恒星。質量比中子星更大的，就會成為黑洞。