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Darmstadtium
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![[Picture]](../images/aglarule.gif){kind=small}
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Name
and
symbol
of
element
of
atomic
number
110 (IUPAC
Recommendations
2003)
http://www.iupac.org/publications/pac/2003/7510/7510x1613.html
"Element 110 has been discovered by the collaboration of Hofmann et al.," S. Hofmann, V. Ninov, F. P. Hessberger, P. Armbruster, H. Folger, G. Münzenberg, H. J. Schott, A. G. Popeko, A. V. Yeremin, A. N. Andreyev, S. Saro, R. Janik, M. Leino. "Production and decay of 269110", Zeitschrift für Physik Phys. A 350, 277-280 ( November 14, 1994 ). |
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The
2001
Joint
Working
Party
summarized
the
effort
with
the
following description: "The
fusion-evaporation
reaction
using
a
62Ni
beam
on
an
isotopically
enriched
208Pb
target
produced
four
chains
of
alpha-emitting
nuclides
following
the
presumed
formation
of
269Ds
+
n.
The
heavy
residue
is
separated
from
non-fusion
residues
in-flight
by
the
electromagnetic
SHIP
velocity
filter
which
spatially localizes,
through
position
sensitive detectors,
the
product
and
its
radioactive progeny.
Even
in
the
first
chain
to
be measured,
the
second
and
third
consecutive
alpha
energies
and
delay
times
are
in
concordance
with
previously
studied
265Hs
and
261Sg.
The
redundancy
of
the
consecutive
alpha
energies
and
delay
times
in
the
second
through
fourth
chains
measured
is
very reassuring.
Even
more
so
is
the
observation
of
fourth
and
fifth
alpha
particle
energies
and
delay
times
in
the
last
two
chains
observed
that
are
in
very
good
agreement
with
the
known
properties
of
descendants
257Rf
and
253No."
In
a similar,
but
more
recent
collaboration
working
on
elements
111
and
112,
Hofmann
et
al.
noted
that
one
of
the
four
Z
=
110 chains,
the
second,
could
not
be
reconstructed
from
the
original data.
The
extant
chains
remain persuasive.
Y.
A. Lazarev,
Y.
V. Lobanov,
Y.
T. Oganessian,
V.
K. Utyonkov,
F.
S. Abdullin,
A.
N.
The bombardment of 244Pu by 34S produced, by a hot fusion pathway, one chain of spatially and temporally correlated alpha-emitting nuclides which was assigned to the product 273Ds. The evaporation residues were separated in flight by a recoil separator. The investigators interpret their results as a sequence of five alpha-emitting nuclides beginning with 273Ds. However, only three of the alpha particles are observed. A number of additional incomplete chains and one incomplete 5- a chain are also noted, but with less confidence. There remains the question as to whether subsequent studies might confirm the observed steps in these incomplete chains. Although the referenced chain´s 273Ds alpha energy agrees with that seen in the recent Hofmann et al. collaboration, the subsequent two observed alphas have delay times at sharp variance with literature values for 265Sg and 257No.
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| APSIDIUM © | Created: | 2002-09-01 |
110.pdf |
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Page update: | 2004-12-08 |
![[Picture]](110_g.jpg)
![[Picture]](110_f.jpg)
![[Picture]](110_c.jpg)
