Contrasting behaviour of proton h 9 2 and h 11/NU> 2 bands in 175,177,179,181Ir interpreted in an intruder model

G. D. Dracoulis; B. Fabricius; A. P. Byrne; A. E. Stuchbery; A. M. Baxter; K. P. Lieb; K. J. Schiffer; T. Kibedi

doi:10.1016/0370-2693(91)90851-G

Contrasting behaviour of proton h_{9 2} and h_{11/NU> 2} bands in ^{175,177,179,181}Ir interpreted in an intruder model

G. D. Dracoulis^*, B. Fabricius, A. P. Byrne, A. E. Stuchbery, A. M. Baxter, K. P. Lieb, K. J. Schiffer, T. Kibedi

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Rotational bands in the odd-proton isotopes ¹⁷⁵Ir, ¹⁷⁷Ir, ¹⁷⁹Ir and ¹⁸¹Ir based on the h_{9 2}, h_{11/NU> 2}, i_{13 2} and d_{11/NU> 2} orbitals have been identified, the first three to high spin. In all cases the h_{9 2} band shows backbending with a crossing frequency and alignment gain consistent with that expected from the neutron i²_{13 2} alignment. In contrast the h_{11/NU> 2} bands (and the fragments of d_{11/NU> 2} bands observed) show complex alignment curves. These alignments can be explained using a phenomenological three-band model which incorporates a deformed intruder band, analogous to that proposed in the very light Pt and Os nuclei. Mixed wave functions from the model reproduce the observed B(M1)/B(E2) ratios. The presence of the intruder band in the h_{11/NU> 2} and d_{11/NU> 2} configurations and its absence in the h_{9 2} band is compatible with its proposed association with an (h²_{9 2})₀ pair excitation.

Original language	English
Pages (from-to)	21-26
Number of pages	6
Journal	Physics Letters B
Volume	257
Issue number	1,2
DOIs	https://doi.org/10.1016/0370-2693(91)90851-G
Publication status	Published - 21 Mar 1991

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@article{24930550e586484f9b519a90a8cdee1c,

title = "Contrasting behaviour of proton h 9 2 and h 11/NU> 2 bands in 175,177,179,181Ir interpreted in an intruder model",

abstract = "Rotational bands in the odd-proton isotopes 175Ir, 177Ir, 179Ir and 181Ir based on the h 9 2, h 11/NU> 2, i 13 2 and d 11/NU> 2 orbitals have been identified, the first three to high spin. In all cases the h 9 2 band shows backbending with a crossing frequency and alignment gain consistent with that expected from the neutron i2 13 2 alignment. In contrast the h 11/NU> 2 bands (and the fragments of d 11/NU> 2 bands observed) show complex alignment curves. These alignments can be explained using a phenomenological three-band model which incorporates a deformed intruder band, analogous to that proposed in the very light Pt and Os nuclei. Mixed wave functions from the model reproduce the observed B(M1)/B(E2) ratios. The presence of the intruder band in the h 11/NU> 2 and d 11/NU> 2 configurations and its absence in the h 9 2 band is compatible with its proposed association with an (h2 9 2)0 pair excitation.",

author = "Dracoulis, {G. D.} and B. Fabricius and Byrne, {A. P.} and Stuchbery, {A. E.} and Baxter, {A. M.} and Lieb, {K. P.} and Schiffer, {K. J.} and T. Kibedi",

note = "Copyright {\textcopyright} 1991 Published by Elsevier B.V.",

year = "1991",

month = mar,

day = "21",

doi = "10.1016/0370-2693(91)90851-G",

language = "English",

volume = "257",

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T1 - Contrasting behaviour of proton h 9 2 and h 11/NU> 2 bands in 175,177,179,181Ir interpreted in an intruder model

AU - Dracoulis, G. D.

AU - Fabricius, B.

AU - Byrne, A. P.

AU - Stuchbery, A. E.

AU - Baxter, A. M.

AU - Lieb, K. P.

AU - Schiffer, K. J.

AU - Kibedi, T.

PY - 1991/3/21

Y1 - 1991/3/21

N2 - Rotational bands in the odd-proton isotopes 175Ir, 177Ir, 179Ir and 181Ir based on the h 9 2, h 11/NU> 2, i 13 2 and d 11/NU> 2 orbitals have been identified, the first three to high spin. In all cases the h 9 2 band shows backbending with a crossing frequency and alignment gain consistent with that expected from the neutron i2 13 2 alignment. In contrast the h 11/NU> 2 bands (and the fragments of d 11/NU> 2 bands observed) show complex alignment curves. These alignments can be explained using a phenomenological three-band model which incorporates a deformed intruder band, analogous to that proposed in the very light Pt and Os nuclei. Mixed wave functions from the model reproduce the observed B(M1)/B(E2) ratios. The presence of the intruder band in the h 11/NU> 2 and d 11/NU> 2 configurations and its absence in the h 9 2 band is compatible with its proposed association with an (h2 9 2)0 pair excitation.

AB - Rotational bands in the odd-proton isotopes 175Ir, 177Ir, 179Ir and 181Ir based on the h 9 2, h 11/NU> 2, i 13 2 and d 11/NU> 2 orbitals have been identified, the first three to high spin. In all cases the h 9 2 band shows backbending with a crossing frequency and alignment gain consistent with that expected from the neutron i2 13 2 alignment. In contrast the h 11/NU> 2 bands (and the fragments of d 11/NU> 2 bands observed) show complex alignment curves. These alignments can be explained using a phenomenological three-band model which incorporates a deformed intruder band, analogous to that proposed in the very light Pt and Os nuclei. Mixed wave functions from the model reproduce the observed B(M1)/B(E2) ratios. The presence of the intruder band in the h 11/NU> 2 and d 11/NU> 2 configurations and its absence in the h 9 2 band is compatible with its proposed association with an (h2 9 2)0 pair excitation.

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VL - 257

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JO - Physics Letters B

JF - Physics Letters B

IS - 1,2

ER -

Contrasting behaviour of proton h_{9 2} and h_{11/NU> 2} bands in ^{175,177,179,181}Ir interpreted in an intruder model

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