Hydrogen-4 1010252 214411413 2008-05-23T12:59:29Z Pamputt 3596959 add link to French article {{Infobox isotope | alternate_names = | symbol =H | mass_number =4 | mass =4.0279121 | num_neutrons =3 | num_protons =1 | abundance = | halflife =9.93696x10<sup>-23</sup> seconds | error_halflife = | background =#eee | text_color = | image = | decay_product = | decay_symbol = | decay_mass = | decay_mode1 = | decay_energy1 = | decay_mode2 = | decay_energy2 = | decay_mode3 = | decay_energy3 = | decay_mode4 = | decay_energy4 = | parent = | parent_symbol = | parent_mass = | parent_decay = | parent2 = | parent2_symbol = | parent2_mass = | parent2_decay = | spin =2 | excess_energy = | error1 = | binding_energy = | error2 = }} '''Hydrogen-4''' is a highly [[unstable isotope|unstable]] [[isotope]] of [[hydrogen]]. The nucleus consists of a proton and three neutrons. It has been synthesised in the laboratory by bombarding [[tritium]] with fast-moving [[deuterium]] nuclei (see [http://content.aip.org/APCPCS/v610/i1/920_1.html this article]). In this experiment, the tritium nuclei captured neutrons from the fast-moving deuterium nucleus. The presence of the hydrogen-4 was deduced by detecting the emitted protons. Its [[atomic mass]] is 4.0279121. It decays through [[neutron emission]] and has a [[half-life]] of 9.93696x10<sup>-23</sup> [[second]]s. ==Quadium== In the [[1955]] satirical novel ''[[The Mouse That Roared]]'', the name '''quadium''' was given to the hydrogen-4 isotope that powered the ''Q-bomb'' that the [[Duchy of Grand Fenwick]] captured from the [[United States]]. ==See also== *[[Isotopes of hydrogen]] {{Isotope|element=Hydrogen |lighter=[[Hydrogen-3]] |heavier=[[Hydrogen-5]] |before=None |after=[[Hydrogen-3]] }} [[Category:Isotopes of hydrogen]] [[fr:Quaternium]] [[ko:수소-4]] [[ru:Водород-4]] [[zh:氫-4]] [[tr:Hidrojen-4]]