Observation of positive-parity bands in 109Pd and 111Pd: Enhanced ¿ softness

E.A. Stefanova; S. Lalkovski; A. Korichi; M. Bergström; A. Lopez-Martens; F.R. Xu; H.L. Liu; S. Kisyov; A. Minkova; Bent Herskind

doi:10.1103/PhysRevC.86.044302

Observation of positive-parity bands in ¹⁰⁹Pd and ¹¹¹Pd: Enhanced ¿ softness

E.A. Stefanova, S. Lalkovski, A. Korichi, M. Bergström, A. Lopez-Martens, F.R. Xu, H.L. Liu, S. Kisyov, A. Minkova, Bent Herskind

Experimental Particle Physics

8 Citations (Scopus)

Abstract

The neutron-rich nuclei 109Pd and 111Pd were produced as fission fragments following the 30Si+168Er reaction at 142 MeV. Using the identification based on the coincidences with the complementary fission fragments, the only positive-parity bands observed so far in 109Pd and 111Pd emerged from this work. A band, built on top of the 5/2⁺ ground state exhibiting ΔI=1 energy-level staggering, was observed in each of these nuclei. Both nuclei of interest, 109Pd and 111Pd, are suggested to lie in the transitional region of Pd isotopes of maximum γ softness. The ground states of both nuclei are predicted by total Routhian surface calculations to be extremely γ soft with shallow triaxial minima. The first crossing in the new bands is proposed to be attributable to an alignment of h11/22 neutrons.

Original language	English
Journal	Physical Review C (Nuclear Physics)
Volume	86
Issue number	4
Pages (from-to)	044302
Number of pages	9
ISSN	0556-2813
DOIs	https://doi.org/10.1103/PhysRevC.86.044302
Publication status	Published - 1 Oct 2012

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Cite this

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title = "Observation of positive-parity bands in 109Pd and 111Pd: Enhanced ¿ softness",

abstract = "The neutron-rich nuclei 109Pd and 111Pd were produced as fission fragments following the 30Si+168Er reaction at 142 MeV. Using the identification based on the coincidences with the complementary fission fragments, the only positive-parity bands observed so far in 109Pd and 111Pd emerged from this work. A band, built on top of the 5/2+ ground state exhibiting ΔI=1 energy-level staggering, was observed in each of these nuclei. Both nuclei of interest, 109Pd and 111Pd, are suggested to lie in the transitional region of Pd isotopes of maximum γ softness. The ground states of both nuclei are predicted by total Routhian surface calculations to be extremely γ soft with shallow triaxial minima. The first crossing in the new bands is proposed to be attributable to an alignment of h11/22 neutrons.",

author = "E.A. Stefanova and S. Lalkovski and A. Korichi and M. Bergstr{\"o}m and A. Lopez-Martens and F.R. Xu and H.L. Liu and S. Kisyov and A. Minkova and Bent Herskind",

year = "2012",

month = oct,

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doi = "10.1103/PhysRevC.86.044302",

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journal = "Physical Review C",

issn = "2469-9985",

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TY - JOUR

T1 - Observation of positive-parity bands in 109Pd and 111Pd

T2 - Enhanced ¿ softness

AU - Stefanova, E.A.

AU - Lalkovski, S.

AU - Korichi, A.

AU - Bergström, M.

AU - Lopez-Martens, A.

AU - Xu, F.R.

AU - Liu, H.L.

AU - Kisyov, S.

AU - Minkova, A.

AU - Herskind, Bent

PY - 2012/10/1

Y1 - 2012/10/1

N2 - The neutron-rich nuclei 109Pd and 111Pd were produced as fission fragments following the 30Si+168Er reaction at 142 MeV. Using the identification based on the coincidences with the complementary fission fragments, the only positive-parity bands observed so far in 109Pd and 111Pd emerged from this work. A band, built on top of the 5/2+ ground state exhibiting ΔI=1 energy-level staggering, was observed in each of these nuclei. Both nuclei of interest, 109Pd and 111Pd, are suggested to lie in the transitional region of Pd isotopes of maximum γ softness. The ground states of both nuclei are predicted by total Routhian surface calculations to be extremely γ soft with shallow triaxial minima. The first crossing in the new bands is proposed to be attributable to an alignment of h11/22 neutrons.

AB - The neutron-rich nuclei 109Pd and 111Pd were produced as fission fragments following the 30Si+168Er reaction at 142 MeV. Using the identification based on the coincidences with the complementary fission fragments, the only positive-parity bands observed so far in 109Pd and 111Pd emerged from this work. A band, built on top of the 5/2+ ground state exhibiting ΔI=1 energy-level staggering, was observed in each of these nuclei. Both nuclei of interest, 109Pd and 111Pd, are suggested to lie in the transitional region of Pd isotopes of maximum γ softness. The ground states of both nuclei are predicted by total Routhian surface calculations to be extremely γ soft with shallow triaxial minima. The first crossing in the new bands is proposed to be attributable to an alignment of h11/22 neutrons.

U2 - 10.1103/PhysRevC.86.044302

DO - 10.1103/PhysRevC.86.044302

M3 - Journal article

SN - 2469-9985

VL - 86

SP - 044302

JO - Physical Review C

JF - Physical Review C

IS - 4

ER -

Observation of positive-parity bands in 109Pd and 111Pd: Enhanced ¿ softness

Abstract

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Observation of positive-parity bands in ¹⁰⁹Pd and ¹¹¹Pd: Enhanced ¿ softness