Prog. Theor. Phys. Supplement No.146 (2002) pp. 94-103
Synthesis and Properties of Heaviest Nuclei with Z = 114 - 116 in 48Ca Induced Reactions
Flerov Laboratory of Nuclear Reactions, Joint Institute
for Nuclear Research,
141980 Dubna, Moscow Region, Russian Federation
(Received March 19, 2002)
The paper presents part of the results on the synthesis of
superheavy nuclides with Z=114 and 116 in the fusion reactions
with 48Ca ions obtained in 2000-2001. In the irradiation of
targets made from enriched 244Pu and 248Cm isotopes with
beam doses of 1.5·1019 and 2.3·1019,
respectively, the detector array situated in the focal plane of
the gas-filled separator registered heavy atoms of new elements
undergoing sequential α-decays terminated by spontaneous
fission. The time of the decay chains is approximately one min.
Decay properties of the synthesized nuclei are consistent the
consecutive α-decays originating from the parent nuclides
288114 and 296116 produced in the 4n-evaporation
channels with the cross section of about 0.5 picobarn.
Comparison of TSF and Tα values for the nuclei with
Z=110 and 112 with those obtained earlier for more light
isotopes of these elements points to an enhanced stability of
heavy nuclei with an increase in the neutron number. The α-decay
energies Qα measured experimentally in the chains 116 -
α1 - 114 - α2 - 112 - α3 - 110 are
compared with theoretical predictions of different nuclear models.
This comparison shows that the difference between the experiment
and theory is in the range of ±0.5 MeV. From this it follows
that the theoretical models predicting the decisive influence of
the nuclear structure on the stability of superheavy elements are
well-founded not only qualitatively but in some sense also
quantitatively. The prospects of further investigations in the
field of superheavy nuclei are discussed briefly.
DOI : 10.1143/PTPS.146.94
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