Evolution of collectivity with spin in [Formula Presented]

R. A. Kaye; C. T. Rastovski; S. L. Tabor; J. Döring; F. Cristancho; M. Devlin; G. D. Johns; I. Y. Lee; F. Lerma; A. O. Macchiavelli; D. G. Sarantites; G. Z. Solomon

doi:10.1103/PhysRevC.66.054305

Evolution of collectivity with spin in [Formula Presented]

R. A. Kaye, C. T. Rastovski, S. L. Tabor, J. Döring, F. Cristancho, M. Devlin, G. D. Johns, I. Y. Lee, F. Lerma, A. O. Macchiavelli, D. G. Sarantites, G. Z. Solomon

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Abstract

Lifetimes of 34 high-spin levels in [Formula Presented] were measured using the Doppler-shift attenuation method. The high-spin states were populated using the [Formula Presented] reaction at 135 MeV, and the recoils were stopped in a thick Ta backing. Prompt multi-[Formula Presented] coincidences were detected using GAMMASPHERE, and evaporated charged particles were detected with the MICROBALL. Transition quadrupole moments inferred from the lifetimes in the lowest positive- and negative-parity bands show a relatively gradual decrease with spin, in agreement with Hartree-Fock-Bogolyubov cranking calculations. The calculations also predict a shape change in each band from predominantly prolate at low spin to triaxial above the first quasiparticle alignment. Thus the observed decrease in collectivity with spin is interpreted as the result of competing shapes which tend to lower the amount of deformation. Other negative-parity bands show evidence for structures with large deformation.

Original language	English
Pages (from-to)	13
Number of pages	1
Journal	Physical Review C - Nuclear Physics
Volume	66
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.66.054305
State	Published - 2002
Externally published	Yes

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title = "Evolution of collectivity with spin in [Formula Presented]",

abstract = "Lifetimes of 34 high-spin levels in [Formula Presented] were measured using the Doppler-shift attenuation method. The high-spin states were populated using the [Formula Presented] reaction at 135 MeV, and the recoils were stopped in a thick Ta backing. Prompt multi-[Formula Presented] coincidences were detected using GAMMASPHERE, and evaporated charged particles were detected with the MICROBALL. Transition quadrupole moments inferred from the lifetimes in the lowest positive- and negative-parity bands show a relatively gradual decrease with spin, in agreement with Hartree-Fock-Bogolyubov cranking calculations. The calculations also predict a shape change in each band from predominantly prolate at low spin to triaxial above the first quasiparticle alignment. Thus the observed decrease in collectivity with spin is interpreted as the result of competing shapes which tend to lower the amount of deformation. Other negative-parity bands show evidence for structures with large deformation.",

author = "Kaye, {R. A.} and Rastovski, {C. T.} and Tabor, {S. L.} and J. D{\"o}ring and F. Cristancho and M. Devlin and Johns, {G. D.} and Lee, {I. Y.} and F. Lerma and Macchiavelli, {A. O.} and Sarantites, {D. G.} and Solomon, {G. Z.}",

year = "2002",

doi = "10.1103/PhysRevC.66.054305",

language = "English",

volume = "66",

pages = "13",

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TY - JOUR

T1 - Evolution of collectivity with spin in [Formula Presented]

AU - Kaye, R. A.

AU - Rastovski, C. T.

AU - Tabor, S. L.

AU - Döring, J.

AU - Cristancho, F.

AU - Devlin, M.

AU - Johns, G. D.

AU - Lee, I. Y.

AU - Lerma, F.

AU - Macchiavelli, A. O.

AU - Sarantites, D. G.

AU - Solomon, G. Z.

PY - 2002

Y1 - 2002

N2 - Lifetimes of 34 high-spin levels in [Formula Presented] were measured using the Doppler-shift attenuation method. The high-spin states were populated using the [Formula Presented] reaction at 135 MeV, and the recoils were stopped in a thick Ta backing. Prompt multi-[Formula Presented] coincidences were detected using GAMMASPHERE, and evaporated charged particles were detected with the MICROBALL. Transition quadrupole moments inferred from the lifetimes in the lowest positive- and negative-parity bands show a relatively gradual decrease with spin, in agreement with Hartree-Fock-Bogolyubov cranking calculations. The calculations also predict a shape change in each band from predominantly prolate at low spin to triaxial above the first quasiparticle alignment. Thus the observed decrease in collectivity with spin is interpreted as the result of competing shapes which tend to lower the amount of deformation. Other negative-parity bands show evidence for structures with large deformation.

AB - Lifetimes of 34 high-spin levels in [Formula Presented] were measured using the Doppler-shift attenuation method. The high-spin states were populated using the [Formula Presented] reaction at 135 MeV, and the recoils were stopped in a thick Ta backing. Prompt multi-[Formula Presented] coincidences were detected using GAMMASPHERE, and evaporated charged particles were detected with the MICROBALL. Transition quadrupole moments inferred from the lifetimes in the lowest positive- and negative-parity bands show a relatively gradual decrease with spin, in agreement with Hartree-Fock-Bogolyubov cranking calculations. The calculations also predict a shape change in each band from predominantly prolate at low spin to triaxial above the first quasiparticle alignment. Thus the observed decrease in collectivity with spin is interpreted as the result of competing shapes which tend to lower the amount of deformation. Other negative-parity bands show evidence for structures with large deformation.

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DO - 10.1103/PhysRevC.66.054305

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JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 5

ER -

Evolution of collectivity with spin in [Formula Presented]

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