Атом ядросының галлосы және құрамы

Core atomic nucleus surrounded by orbiting protons or neutrons

In nuclear physics, an atomic nucleus is called a halo nucleus or is said to have a nuclear halo when it has a core nucleus surrounded by a "halo" of orbiting protons or neutrons, which makes the radius of the nucleus appreciably larger than that predicted by the liquid drop model. Halo nuclei form at the extreme edges of the table of nuclides — the neutron drip line and proton drip line — and have short half lives, measured in milliseconds. These nuclei are studied shortly after their formation in an ion beam. Typically, an atomic nucleus is a tightly bound group of protons and neutrons. However, in some nuclides, there is an overabundance of one species of nucleon. In some of these cases, a nuclear core and a halo will form. Often, this property may be detected in scattering experiments, which show the nucleus to be much larger than the otherwise expected value. Normally, the cross section (corresponding to the classical radius) of the nucleus is proportional to the cube root of its mass, as would be the case for a sphere of constant density. Specifically, for a nucleus of mass number A, the radius r is (approximately)

where is 1.2 fm. One example of a halo nucleus is 11Li, which has a half life of 8.6 ms. It contains a core of 3 protons and 6 neutrons, and a halo of two independent and loosely bound neutrons. It decays into 11Be by the emission of an antineutrino and an electron. Its mass radius of 3.16 fm is close to that of 32S or, even more impressively, of 208Pb, both much heavier nuclei. Experimental confirmation of nuclear halos is recent and ongoing. Additional candidates are suspected. Several nuclides including 9B, 13N, and 15N are calculated to have a halo in the excited state but not in the ground state.

Nuclei that have a neutron halo include 11Be and 19C. A two neutron halo is exhibited by 6He, 11Li, 17B, 19B and 22C. Two neutron halo nuclei break into three fragments and are called Borromean because of this behavior, analogously to how all three of the Borromean rings are linked together but no two share a link. For example, the two neutron halo nucleus 6He (which can be taken as a three body system consisting of an alpha particle and two neutrons) is bound, but neither 5He nor the dineutron is. 8He and 14Be both exhibit a four neutron halo. Nuclei that have a proton halo include 8B and 26P. A two proton halo is exhibited by 17Ne and 27S. Proton halos are expected to be rarer and more unstable than neutron halos because of the repulsive forces of the excess proton(s). Atomicnumber Name # of nuclearhalo isotopes Nuclear haloisotopes HalocompositionHalf life (ms) 2 helium 2 helium 6helium 8 2 neutrons 4 neutrons 801(10)119.1(12) 3 lithium 1 lithium 11 2 neutrons 8.75(14) 4 beryllium 2 beryllium 11beryllium 14 1 neutron4 neutrons 13810(80)4.35(17) 5 boron 3 boron 8boron 17boron 19 1 proton2 neutrons4 neutrons 770(3)5.08(5)2.92(13) 6 carbon 2 carbon 19carbon 22 1 neutron2 neutrons 49(4)6.1 10 neon 1 neon 17 2 protons 109.2(6) 15 phosphorus 1 phosphorus 26 1 proton 43.7(6) 16 sulfur 1 sulfur 27 2 protons 15.5(15)