Nuclides that have the same neutron excess are called isodiaphers.
2.
Thanks to the neutron excess, the resulting nuclei were expected to be heavier and closer to the sought-after island of stability.
3.
For its mass, 48 Ca has by far the greatest neutron excess of all practically stable nuclei, both quantitative and relative, which, correspondingly, helps synthesize superheavy nuclei with more neutrons.
4.
The JINR team sought to use berkelium because calcium-48, the isotope of calcium used in the beam, has 20 protons and 28 neutrons, making a neutron proton ratio of 1.4; and it is the lightest stable or near-stable nucleus with such a large neutron excess.
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