The decompression of cold neutron star matter
The decompression of cold neutron star matter
复制标题
冷中子星物质的减压
DOI：
10.1086/155148
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发表时间：
1977
期刊：
影响因子：
--
通讯作者：
D. Schramm
中科院分区：
文献类型：
--
作者：
J. Lattimer;F. Mackie;D. Ravenhall;D. Schramm
膨胀，最初冷，中子星星物质的组成进行检查。提出了一个核物质质量的半经验公式。在物质处于其最低能量状态的假设下，描述了决定平衡预膨胀物质组成的四个平衡条件。有人认为，当密度低于核密度时，就会形成与相同密度的平衡物质的核团簇非常相似的核团簇。福尔斯。膨胀是通过假设核内的物质与核外滴下的中子海处于平衡来进行的。当密度进一步降低时，这些原子核将中子丢失到外部的中子海中。最后，当...贝塔.. -衰减时间尺度变得比扩展时间尺度短，贝塔.. -发生衰变。原子核的质子数和中子数都会增加，直到它们变得不稳定而不能裂变。值得注意的是，后面的这些阶段与经典的r过程有相似之处：事实上，随着物质的循环和中子数的减少，相似性增加。但是由于Z-N平面中的核的路径更靠近β稳定性谷的富中子一侧，因此更容易制造Z约为126的超重元素（最近可能已经检测到）比r过程。«少
The composition of expanding, initially cold, neutron star matter is examined. A semiempirical mass formula for nuclear matter is developed. Under the assumption that the matter occupies its lowest energy state, the four equilibrium conditions which determine the composition of the equilibrium, preexpansion matter are described. It is argued that as the density falls below nuclear density, nuclear clusters are formed which are very similar to those of equilibrium matter of the same density. The expansion is carried out by assuming that the matter inside the nucleus is in equilibrium with the dripped neutron sea outside. As the density is further lowered, these nuclei lose neutrons to the external sea of neutrons. Finally, when the ..beta..-decay time scale becomes shorter than the expansion time scale, ..beta..-decays take place. The nuclei then increase in both proton and neutron number, until they become unstable to fission. It is noted that these latter stages bear a resemblance to the classical r-process: and, in fact, as the matter cycles and the number of neutrons is depleted, the similarity increases. But because the path of the nuceli in the Z-N plane lies somewhat more to the neutron-rich side of the valley of beta stability, itmore » is easier to make superheavy elements with Zapprox.126 (which may have been recently detected) than in the r-process.« less