Search for two-phonon octupole excitations in 146Gd

J. N. Orce; M. Kumar Raju; N. A. Khumalo; T. S. Dinoko; P. Jones; R. A. Bark; E. A. Lawrie; S. N.T. Majola; L. M. Robledo; B. Rubio; M. Wiedeking; J. Easton; E. A. Khaleel; B. V. Kheswa; N. Kheswa; M. S. Herbert; J. J. Lawrie; P. L. Masiteng; M. R. Nchodu; J. Ndayishimye; D. Negi; S. P. Noncolela; S. S. Ntshangase; P. Papka; D. G. Roux; O. Shirinda; P. S. Sithole; S. W. Yates

doi:10.1140/epja/i2016-16166-2

Search for two-phonon octupole excitations in ¹⁴⁶Gd

J. N. Orce, M. Kumar Raju, N. A. Khumalo, T. S. Dinoko, P. Jones, R. A. Bark, E. A. Lawrie, S. N.T. Majola, L. M. Robledo, B. Rubio, M. Wiedeking, J. Easton, E. A. Khaleel, B. V. Kheswa, N. Kheswa, M. S. Herbert, J. J. Lawrie, P. L. Masiteng, M. R. Nchodu, J. NdayishimyeD. Negi, S. P. Noncolela, S. S. Ntshangase, P. Papka, D. G. Roux, O. Shirinda, P. S. Sithole, S. W. Yates

Chemistry

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

Abstract

The low-spin structure of the nearly spherical nucleus ¹⁴⁶Gd was studied using the ¹⁴⁴Sm(⁴He, 2n) fusion-evaporation reaction. High-statistics γ-γ coincidence measurements were performed at iThemba LABS with 7× 10⁹γ-γ coincidence events recorded. Gated γ-ray energy spectra show evidence for the 6⁺ ₂ → 3^- ₁ → 0⁺ ₁ cascade of E3 transitions in agreement with recent findings by Caballero and co-workers, but with a smaller branching ratio of I_γ = 4.7(10) for the 6⁺ ₂ → 3^- ₁ 1905.1 keV γ ray. Although these findings may support octupole vibrations in spherical nuclei, sophisticated beyond mean-field calculations including angular-momentum projection are required to interpret in an appropriate way the available data due to the failure of the rotational model assumptions in this nucleus.

Original language	English
Article number	166
Journal	European Physical Journal A
Volume	52
Issue number	6
DOIs	https://doi.org/10.1140/epja/i2016-16166-2
State	Published - Jun 1 2016

Bibliographical note

Publisher Copyright:
© 2016, SIF, Springer-Verlag Berlin Heidelberg.

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1140/epja/i2016-16166-2

Cite this

Orce, J. N., Kumar Raju, M., Khumalo, N. A., Dinoko, T. S., Jones, P., Bark, R. A., Lawrie, E. A., Majola, S. N. T., Robledo, L. M., Rubio, B., Wiedeking, M., Easton, J., Khaleel, E. A., Kheswa, B. V., Kheswa, N., Herbert, M. S., Lawrie, J. J., Masiteng, P. L., Nchodu, M. R., ... Yates, S. W. (2016). Search for two-phonon octupole excitations in ¹⁴⁶Gd. European Physical Journal A, 52(6), Article 166. https://doi.org/10.1140/epja/i2016-16166-2

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title = "Search for two-phonon octupole excitations in 146Gd",

abstract = "The low-spin structure of the nearly spherical nucleus 146Gd was studied using the 144Sm(4He, 2n) fusion-evaporation reaction. High-statistics γ-γ coincidence measurements were performed at iThemba LABS with 7× 109γ-γ coincidence events recorded. Gated γ-ray energy spectra show evidence for the 6+ 2 → 3- 1 → 0+ 1 cascade of E3 transitions in agreement with recent findings by Caballero and co-workers, but with a smaller branching ratio of Iγ = 4.7(10) for the 6+ 2 → 3- 1 1905.1 keV γ ray. Although these findings may support octupole vibrations in spherical nuclei, sophisticated beyond mean-field calculations including angular-momentum projection are required to interpret in an appropriate way the available data due to the failure of the rotational model assumptions in this nucleus.",

author = "Orce, {J. N.} and {Kumar Raju}, M. and Khumalo, {N. A.} and Dinoko, {T. S.} and P. Jones and Bark, {R. A.} and Lawrie, {E. A.} and Majola, {S. N.T.} and Robledo, {L. M.} and B. Rubio and M. Wiedeking and J. Easton and Khaleel, {E. A.} and Kheswa, {B. V.} and N. Kheswa and Herbert, {M. S.} and Lawrie, {J. J.} and Masiteng, {P. L.} and Nchodu, {M. R.} and J. Ndayishimye and D. Negi and Noncolela, {S. P.} and Ntshangase, {S. S.} and P. Papka and Roux, {D. G.} and O. Shirinda and Sithole, {P. S.} and Yates, {S. W.}",

note = "Publisher Copyright: {\textcopyright} 2016, SIF, Springer-Verlag Berlin Heidelberg.",

year = "2016",

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Orce, JN, Kumar Raju, M, Khumalo, NA, Dinoko, TS, Jones, P, Bark, RA, Lawrie, EA, Majola, SNT, Robledo, LM, Rubio, B, Wiedeking, M, Easton, J, Khaleel, EA, Kheswa, BV, Kheswa, N, Herbert, MS, Lawrie, JJ, Masiteng, PL, Nchodu, MR, Ndayishimye, J, Negi, D, Noncolela, SP, Ntshangase, SS, Papka, P, Roux, DG, Shirinda, O, Sithole, PS & Yates, SW 2016, 'Search for two-phonon octupole excitations in ¹⁴⁶Gd', European Physical Journal A, vol. 52, no. 6, 166. https://doi.org/10.1140/epja/i2016-16166-2

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AU - Orce, J. N.

AU - Kumar Raju, M.

AU - Khumalo, N. A.

AU - Dinoko, T. S.

AU - Jones, P.

AU - Bark, R. A.

AU - Lawrie, E. A.

AU - Majola, S. N.T.

AU - Robledo, L. M.

AU - Rubio, B.

AU - Wiedeking, M.

AU - Easton, J.

AU - Khaleel, E. A.

AU - Kheswa, B. V.

AU - Kheswa, N.

AU - Herbert, M. S.

AU - Lawrie, J. J.

AU - Masiteng, P. L.

AU - Nchodu, M. R.

AU - Ndayishimye, J.

AU - Negi, D.

AU - Noncolela, S. P.

AU - Ntshangase, S. S.

AU - Papka, P.

AU - Roux, D. G.

AU - Shirinda, O.

AU - Sithole, P. S.

AU - Yates, S. W.

PY - 2016/6/1

Y1 - 2016/6/1

N2 - The low-spin structure of the nearly spherical nucleus 146Gd was studied using the 144Sm(4He, 2n) fusion-evaporation reaction. High-statistics γ-γ coincidence measurements were performed at iThemba LABS with 7× 109γ-γ coincidence events recorded. Gated γ-ray energy spectra show evidence for the 6+ 2 → 3- 1 → 0+ 1 cascade of E3 transitions in agreement with recent findings by Caballero and co-workers, but with a smaller branching ratio of Iγ = 4.7(10) for the 6+ 2 → 3- 1 1905.1 keV γ ray. Although these findings may support octupole vibrations in spherical nuclei, sophisticated beyond mean-field calculations including angular-momentum projection are required to interpret in an appropriate way the available data due to the failure of the rotational model assumptions in this nucleus.

AB - The low-spin structure of the nearly spherical nucleus 146Gd was studied using the 144Sm(4He, 2n) fusion-evaporation reaction. High-statistics γ-γ coincidence measurements were performed at iThemba LABS with 7× 109γ-γ coincidence events recorded. Gated γ-ray energy spectra show evidence for the 6+ 2 → 3- 1 → 0+ 1 cascade of E3 transitions in agreement with recent findings by Caballero and co-workers, but with a smaller branching ratio of Iγ = 4.7(10) for the 6+ 2 → 3- 1 1905.1 keV γ ray. Although these findings may support octupole vibrations in spherical nuclei, sophisticated beyond mean-field calculations including angular-momentum projection are required to interpret in an appropriate way the available data due to the failure of the rotational model assumptions in this nucleus.

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