Spherical and deformed structures in 189Pb

A. M. Baxter; G. D. Dracoulis; A. P. Byrne; T. Kibédi; P. M. Davidson; R. V.F. Janssens; M. P. Carpenter; C. N. Davids; T. L. Khoo; T. Lauritsen

doi:10.1063/1.1905292

Spherical and deformed structures in ¹⁸⁹Pb

A. M. Baxter^*, G. D. Dracoulis, A. P. Byrne, T. Kibédi, P. M. Davidson, R. V.F. Janssens, M. P. Carpenter, C. N. Davids, T. L. Khoo, T. Lauritsen

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Gamma-ray spectroscopy of high-spin states of the neutron-deficient nucleus ¹⁸⁹Pb has been conducted with the ¹⁵⁸Gd( ³⁶Ar,5n) and ¹⁶⁴Er(²⁹Si,4n) reactions. With the first of these, detection of evaporation residues and mass gating were used to unambiguously assign a number of prompt γ ray transitions to ¹⁸⁹Pb. With the second reaction and a pulsed beams, an isomer with a mean life of 32 μsec was found and the decay scheme below it established. Although inconclusive, the available evidence favours identification of the isomer with the 332⁺ state of the v(i_13/2)^-3 configuration. The levels observed below the isomer can be identified with states involving three different structures: the neutron (i_13/2) ^-3 multiplet in the spherical well; a prolate-deformed band involving mixed i_13/2 neutron orbitals; and a state with the oblate π(2p-2h)₀₊ ⊗ v(i_13/2)^-1 configuration.

Original language	English
Title of host publication	NUCLEI AT THE LIMITS
Pages	62-67
Number of pages	6
DOIs	https://doi.org/10.1063/1.1905292
Publication status	Published - 5 Apr 2005
Event	Nuclei at the Limits - Argonne, IL, United States Duration: 26 Jul 2004 → 30 Jul 2004

Publication series

Name	AIP Conference Proceedings
Volume	764
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	Nuclei at the Limits
Country/Territory	United States
City	Argonne, IL
Period	26/07/04 → 30/07/04

Access to Document

10.1063/1.1905292

Cite this

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title = "Spherical and deformed structures in 189Pb",

abstract = "Gamma-ray spectroscopy of high-spin states of the neutron-deficient nucleus 189Pb has been conducted with the 158Gd( 36Ar,5n) and 164Er(29Si,4n) reactions. With the first of these, detection of evaporation residues and mass gating were used to unambiguously assign a number of prompt γ ray transitions to 189Pb. With the second reaction and a pulsed beams, an isomer with a mean life of 32 μsec was found and the decay scheme below it established. Although inconclusive, the available evidence favours identification of the isomer with the 332+ state of the v(i13/2)-3 configuration. The levels observed below the isomer can be identified with states involving three different structures: the neutron (i13/2) -3 multiplet in the spherical well; a prolate-deformed band involving mixed i13/2 neutron orbitals; and a state with the oblate π(2p-2h)0+ ⊗ v(i13/2)-1 configuration.",

author = "Baxter, {A. M.} and Dracoulis, {G. D.} and Byrne, {A. P.} and T. Kib{\'e}di and Davidson, {P. M.} and Janssens, {R. V.F.} and Carpenter, {M. P.} and Davids, {C. N.} and Khoo, {T. L.} and T. Lauritsen",

year = "2005",

month = apr,

day = "5",

doi = "10.1063/1.1905292",

language = "English",

isbn = "0735402493",

series = "AIP Conference Proceedings",

pages = "62--67",

booktitle = "NUCLEI AT THE LIMITS",

note = "Nuclei at the Limits ; Conference date: 26-07-2004 Through 30-07-2004",

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T1 - Spherical and deformed structures in 189Pb

AU - Baxter, A. M.

AU - Dracoulis, G. D.

AU - Byrne, A. P.

AU - Kibédi, T.

AU - Davidson, P. M.

AU - Janssens, R. V.F.

AU - Carpenter, M. P.

AU - Davids, C. N.

AU - Khoo, T. L.

AU - Lauritsen, T.

PY - 2005/4/5

Y1 - 2005/4/5

N2 - Gamma-ray spectroscopy of high-spin states of the neutron-deficient nucleus 189Pb has been conducted with the 158Gd( 36Ar,5n) and 164Er(29Si,4n) reactions. With the first of these, detection of evaporation residues and mass gating were used to unambiguously assign a number of prompt γ ray transitions to 189Pb. With the second reaction and a pulsed beams, an isomer with a mean life of 32 μsec was found and the decay scheme below it established. Although inconclusive, the available evidence favours identification of the isomer with the 332+ state of the v(i13/2)-3 configuration. The levels observed below the isomer can be identified with states involving three different structures: the neutron (i13/2) -3 multiplet in the spherical well; a prolate-deformed band involving mixed i13/2 neutron orbitals; and a state with the oblate π(2p-2h)0+ ⊗ v(i13/2)-1 configuration.

AB - Gamma-ray spectroscopy of high-spin states of the neutron-deficient nucleus 189Pb has been conducted with the 158Gd( 36Ar,5n) and 164Er(29Si,4n) reactions. With the first of these, detection of evaporation residues and mass gating were used to unambiguously assign a number of prompt γ ray transitions to 189Pb. With the second reaction and a pulsed beams, an isomer with a mean life of 32 μsec was found and the decay scheme below it established. Although inconclusive, the available evidence favours identification of the isomer with the 332+ state of the v(i13/2)-3 configuration. The levels observed below the isomer can be identified with states involving three different structures: the neutron (i13/2) -3 multiplet in the spherical well; a prolate-deformed band involving mixed i13/2 neutron orbitals; and a state with the oblate π(2p-2h)0+ ⊗ v(i13/2)-1 configuration.

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