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Particle- γ coincidence spectroscopy of the N = 90 nucleus 154Gd by (p,tγ)
. A segmented Si-telescope and HPGe array, STARS-LIBERACE, was used to study the 156 Gd( p , t γ ) 154 Gd direct reaction by particle- γ coincidence spectroscopy. New cross sections with a 25MeV proton beam are reported and compared to previous (p,t) and (t,p) studies. Furthermore, additional eviden...
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Published in: | The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2017, Vol.53 (3), p.1-9 |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | .
A segmented Si-telescope and HPGe array, STARS-LIBERACE, was used to study the
156
Gd(
p
,
t
γ
)
154
Gd direct reaction by particle-
γ
coincidence spectroscopy. New cross sections with a 25MeV proton beam are reported and compared to previous (p,t) and (t,p) studies. Furthermore, additional evidence for coexisting
K
π
=
0
1
+
,
2
1
+
and
0
2
+
,
2
2
+
configurations at
N
= 90 is presented. Direct and indirect population patterns of the low-lying states are also explored. Review of the new and existing evidence favors an interpretation based on a configuration-dependent pairing interaction. The weakening of monopole pairing strength and an increase in quadrupole pairing strength could bring 2p-2h
0
+
states below
2
Δ
. This may account for a large number of the low-lying
0
+
states observed in two-nucleon transfer reactions. A hypothesis for the origin of the
0
2
+
and
0
3
+
states is provided. |
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ISSN: | 1434-6001 1434-601X |
DOI: | 10.1140/epja/i2017-12253-2 |