RT Journal Article
SR Electronic
T1 Direct Mapping of Nuclear Shell Effects in the Heaviest Elements
JF Science
JO Science
FD American Association for the Advancement of Science
SP 1207
OP 1210
DO 10.1126/science.1225636
VO 337
IS 6099
A1 Ramirez, E. Minaya
A1 Ackermann, D.
A1 Blaum, K.
A1 Block, M.
A1 Droese, C.
A1 Düllmann, Ch. E.
A1 Dworschak, M.
A1 Eibach, M.
A1 Eliseev, S.
A1 Haettner, E.
A1 Herfurth, F.
A1 Heßberger, F. P.
A1 Hofmann, S.
A1 Ketelaer, J.
A1 Marx, G.
A1 Mazzocco, M.
A1 Nesterenko, D.
A1 Novikov, Yu. N.
A1 Plaß, W. R.
A1 Rodríguez, D.
A1 Scheidenberger, C.
A1 Schweikhard, L.
A1 Thirolf, P. G.
A1 Weber, C.
YR 2012
UL http://science.sciencemag.org/content/337/6099/1207.abstract
AB Quantum-mechanical shell effects are expected to strongly enhance nuclear binding on an “island of stability” of superheavy elements. The predicted center at proton number Z = 114, 120, or 126 and neutron number N = 184 has been substantiated by the recent synthesis of new elements up to Z = 118. However, the location of the center and the extension of the island of stability remain vague. High-precision mass spectrometry allows the direct measurement of nuclear binding energies and thus the determination of the strength of shell effects. Here, we present such measurements for nobelium and lawrencium isotopes, which also pin down the deformed shell gap at N = 152.