Anonymous
Anonymous asked in 科學及數學天文學及太空 · 1 decade ago

中子星一問

白矮星轉為中子星時, 電子和質子會合併成為中子, 但是電子和質子的電性是相反的哦, 為甚麼會合併成中子而不是相抵銷且變成光子將能量放走?

2 Answers

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  • Carson
    Lv 6
    1 decade ago
    Favorite Answer

    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.)

    Source(s): 自己
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  • ?
    Lv 5
    1 decade ago

    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。

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