nucleon drip line造句

• The nucleon drip lines are at the extremes of the neutron-proton ratio.
• The nucleon drip lines are at the extreme of the proton-to-neutron ratio : at p : n ratios at or beyond the driplines, no stable nuclei can exist.
• However, as proton captures are inhibited by the Coulomb barrier, the cross sections for those charged-particle reactions at lower energies are greatly suppressed, and in the higher energy regimes where proton captures have a large probability to occur, there is often a competition between the proton capture and the photodisintegration that occurs in explosive hydrogen burning; but because the proton drip line is relatively much closer to the valley of beta-stability than is the neutron drip line, nucleosynthesis in some environments may proceed as far as either nucleon drip line.