Coexistence of triaxial and prolate shapes in 171Ir

R. A. Bark; S. Törmänen; T. Bäck; B. Cederwall; S. W. Ødegård; J. F.C. Cocks; K. Helariutta; P. Jones; R. Julin; S. Juutinen; H. Kankaanpää; H. Kettunen; P. Kuusiniemi; M. Leino; M. Muikku; P. Rahkila; A. Savelius; M. Bergström; F. Ingebretsen; A. Maj; M. Mattiuzzi; W. Mueller; L. L. Riedinger; T. Saitoh; P. O. Tjøm

doi:10.1016/S0375-9474(99)00319-X

Coexistence of triaxial and prolate shapes in ¹⁷¹Ir

R. A. Bark^*, S. Törmänen, T. Bäck, B. Cederwall, S. W. Ødegård, J. F.C. Cocks, K. Helariutta, P. Jones, R. Julin, S. Juutinen, H. Kankaanpää, H. Kettunen, P. Kuusiniemi, M. Leino, M. Muikku, P. Rahkila, A. Savelius, M. Bergström, F. Ingebretsen, A. MajM. Mattiuzzi, W. Mueller, L. L. Riedinger, T. Saitoh, P. O. Tjøm

^*Corresponding author for this work

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

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Abstract

Excited states in ¹⁷¹Ir have been observed for the first time. Gamma-rays were assigned to the nucleus by the recoil-decay tagging method. The ground-state band has a structure consistent with an h_11/2 proton coupled to a core of large triaxial deformation. At high spins, a bandcrossing occurs which is interpreted as a change in shape to a prolate deformation. Band-mixing calculations are performed for ^171-175Ir. These show that shape-coexistence between triaxial and prolate states in these nuclei follows the same systematics found in their Pt and Os neighbours. The systematics are also compared with deformations calculated for ^171-179Ir using the code "Ultimate Cranker". Dipole bands were also observed, but tilted axis cranking calculations suggest that they are associated with a collective rotation.

Original language	English
Pages (from-to)	113-133
Number of pages	21
Journal	Nuclear Physics A
Volume	657
Issue number	2
DOIs	https://doi.org/10.1016/S0375-9474(99)00319-X
Publication status	Published - 20 Sept 1999

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Bark, R. A., Törmänen, S., Bäck, T., Cederwall, B., Ødegård, S. W., Cocks, J. F. C., Helariutta, K., Jones, P., Julin, R., Juutinen, S., Kankaanpää, H., Kettunen, H., Kuusiniemi, P., Leino, M., Muikku, M., Rahkila, P., Savelius, A., Bergström, M., Ingebretsen, F., ... Tjøm, P. O. (1999). Coexistence of triaxial and prolate shapes in ¹⁷¹Ir. Nuclear Physics A, 657(2), 113-133. https://doi.org/10.1016/S0375-9474(99)00319-X

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title = "Coexistence of triaxial and prolate shapes in 171Ir",

abstract = "Excited states in 171Ir have been observed for the first time. Gamma-rays were assigned to the nucleus by the recoil-decay tagging method. The ground-state band has a structure consistent with an h11/2 proton coupled to a core of large triaxial deformation. At high spins, a bandcrossing occurs which is interpreted as a change in shape to a prolate deformation. Band-mixing calculations are performed for 171-175Ir. These show that shape-coexistence between triaxial and prolate states in these nuclei follows the same systematics found in their Pt and Os neighbours. The systematics are also compared with deformations calculated for 171-179Ir using the code {"}Ultimate Cranker{"}. Dipole bands were also observed, but tilted axis cranking calculations suggest that they are associated with a collective rotation.",

keywords = "Nuclear reactions Sn(Ni,p2n), E = 260,267 MeV",

author = "Bark, {R. A.} and S. T{\"o}rm{\"a}nen and T. B{\"a}ck and B. Cederwall and {\O}deg{\aa}rd, {S. W.} and Cocks, {J. F.C.} and K. Helariutta and P. Jones and R. Julin and S. Juutinen and H. Kankaanp{\"a}{\"a} and H. Kettunen and P. Kuusiniemi and M. Leino and M. Muikku and P. Rahkila and A. Savelius and M. Bergstr{\"o}m and F. Ingebretsen and A. Maj and M. Mattiuzzi and W. Mueller and Riedinger, {L. L.} and T. Saitoh and Tj{\o}m, {P. O.}",

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doi = "10.1016/S0375-9474(99)00319-X",

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Bark, RA, Törmänen, S, Bäck, T, Cederwall, B, Ødegård, SW, Cocks, JFC, Helariutta, K, Jones, P, Julin, R, Juutinen, S, Kankaanpää, H, Kettunen, H, Kuusiniemi, P, Leino, M, Muikku, M, Rahkila, P, Savelius, A, Bergström, M, Ingebretsen, F, Maj, A, Mattiuzzi, M, Mueller, W, Riedinger, LL, Saitoh, T & Tjøm, PO 1999, 'Coexistence of triaxial and prolate shapes in ¹⁷¹Ir', Nuclear Physics A, vol. 657, no. 2, pp. 113-133. https://doi.org/10.1016/S0375-9474(99)00319-X

TY - JOUR

T1 - Coexistence of triaxial and prolate shapes in 171Ir

AU - Bark, R. A.

AU - Törmänen, S.

AU - Bäck, T.

AU - Cederwall, B.

AU - Ødegård, S. W.

AU - Cocks, J. F.C.

AU - Helariutta, K.

AU - Jones, P.

AU - Julin, R.

AU - Juutinen, S.

AU - Kankaanpää, H.

AU - Kettunen, H.

AU - Kuusiniemi, P.

AU - Leino, M.

AU - Muikku, M.

AU - Rahkila, P.

AU - Savelius, A.

AU - Bergström, M.

AU - Ingebretsen, F.

AU - Maj, A.

AU - Mattiuzzi, M.

AU - Mueller, W.

AU - Riedinger, L. L.

AU - Saitoh, T.

AU - Tjøm, P. O.

PY - 1999/9/20

Y1 - 1999/9/20

N2 - Excited states in 171Ir have been observed for the first time. Gamma-rays were assigned to the nucleus by the recoil-decay tagging method. The ground-state band has a structure consistent with an h11/2 proton coupled to a core of large triaxial deformation. At high spins, a bandcrossing occurs which is interpreted as a change in shape to a prolate deformation. Band-mixing calculations are performed for 171-175Ir. These show that shape-coexistence between triaxial and prolate states in these nuclei follows the same systematics found in their Pt and Os neighbours. The systematics are also compared with deformations calculated for 171-179Ir using the code "Ultimate Cranker". Dipole bands were also observed, but tilted axis cranking calculations suggest that they are associated with a collective rotation.

AB - Excited states in 171Ir have been observed for the first time. Gamma-rays were assigned to the nucleus by the recoil-decay tagging method. The ground-state band has a structure consistent with an h11/2 proton coupled to a core of large triaxial deformation. At high spins, a bandcrossing occurs which is interpreted as a change in shape to a prolate deformation. Band-mixing calculations are performed for 171-175Ir. These show that shape-coexistence between triaxial and prolate states in these nuclei follows the same systematics found in their Pt and Os neighbours. The systematics are also compared with deformations calculated for 171-179Ir using the code "Ultimate Cranker". Dipole bands were also observed, but tilted axis cranking calculations suggest that they are associated with a collective rotation.

KW - Nuclear reactions Sn(Ni,p2n), E = 260,267 MeV

UR - http://www.scopus.com/inward/record.url?scp=0033588767&partnerID=8YFLogxK

U2 - 10.1016/S0375-9474(99)00319-X

DO - 10.1016/S0375-9474(99)00319-X

M3 - Article

SN - 0375-9474

VL - 657

SP - 113

EP - 133

JO - Nuclear Physics A

JF - Nuclear Physics A

IS - 2

ER -

Coexistence of triaxial and prolate shapes in ¹⁷¹Ir

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