Decay spectroscopy of 179 82 Pb 97 and evidence for a 9/2− intruder state in 179 81 Tl 98
Badran, H., Scholey, C., Uusitalo, J., Auranen, K., Grahn, T., Greenlees, P., . . . Stolze, S. (2017). Decay spectroscopy of 179 82 Pb 97 and evidence for a 9/2− intruder state in 179 81 Tl 98. Physical Review C, 96 (6), 064314. doi:10.1103/PhysRevC.96.064314
Published in
Physical Review CDate
2017Copyright
©2017 American Physical Society. Published in this repository with the kind permission of the publisher.
The very neutron-deficient isobars
179
Pb
and
179
Tl
have been produced using the fusion-evaporation reactions
104
Pd
(
78
Kr
,
x
p
y
n
), where
x
≤
1
and
y
≥
2
. The gas-filled separator RITU was employed to transport and separate the recoiling nuclei of interest from the scattered beam and unwanted products. The GREAT spectrometer was used to study the decay properties through
α
−
α
and
α
−
γ
correlations, which has allowed the ground state of
179
Pb
to be assigned as
I
π
=
9
/
2
−
. The decay of
179
Pb
was measured to have an
α
-particle energy and half-life of
E
α
=
7348
(
5
)
keV
and
t
1
/
2
=
2.7
(
2
)
ms, respectively. A search for a
ν
i
13
/
2
state in
179
Pb
was performed, but only a limit of excitation energy and half-life was obtained. In
179
Tl
a
t
1
/
2
=
114
+
18
−
10
ns isomeric state, likely at an excitation energy of 904.5(9) keV, was identified and
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