Refuting the nature of the sixth 0+ Hoyle-analogue state candidate in 16O

K. C.W. Li; P. Adsley; R. Neveling; P. Papka; F. D. Smit; J. W. Brümmer; C. Aa Diget; M. Freer; M. N. Harakeh; Tz Kokalova; F. Nemulodi; L. Pellegri; B. Rebeiro; J. A. Swartz; S. Triambak; J. J. Van Zyl; C. Wheldon

doi:10.22323/1.281.0040

Refuting the nature of the sixth 0⁺ Hoyle-analogue state candidate in ¹⁶O

K. C.W. Li, P. Adsley, R. Neveling, P. Papka, F. D. Smit, J. W. Brümmer, C. Aa Diget, M. Freer, M. N. Harakeh, Tz Kokalova, F. Nemulodi, L. Pellegri, B. Rebeiro, J. A. Swartz, S. Triambak, J. J. Van Zyl, C. Wheldon

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Abstract

A prominent candidate for a Hoyle-analogue state in ¹⁶O is the 0⁺ ₆ state, previously observed at E_x = 15.097(5) MeV. This state is identified by several theoretical cluster calculations to be a good candidate for the 4-α cluster state, analogous to the Hoyle state in ¹²C. Whilst much theoretical work has been performed to reconcile a calculated α-cluster state with this resonance, the experimental information on this state remained very scarce. To investigate this state, the ¹⁶O(α, α') reaction was studied at θ_lab = 0° at an incident energy of E_lab = 200 MeV using the K600 magnetic spectrometer at iThemba LABS. For the first time, the decay channels of the E_x = 15.097(5) MeV state were isolated using a large acceptance silicon-strip detector array at backward angles. The lineshapes of the states were analysed within a phenomenological R-matrix framework. Results indicate the presence of a resonance at E_x ≈ 15 MeV which does not exhibit a J^π = 0⁺ nature.

Original language	English
Article number	040
Number of pages	8
Journal	Proceedings of Science
Volume	281
Issue number	September 2016
Early online date	4 May 2017
DOIs	https://doi.org/10.22323/1.281.0040
Publication status	Published - 1 Dec 2017
Event	26th International Nuclear Physics Conference, INPC 2016 - Adelaide, Australia Duration: 11 Sept 2016 → 16 Sept 2016

ASJC Scopus subject areas

General

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KCW_Li_et_al_Refuting_the_nature_of_the_sixth_Proceedings_of_Science_2016
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Cite this

Li, K. C. W., Adsley, P., Neveling, R., Papka, P., Smit, F. D., Brümmer, J. W., Diget, C. A., Freer, M., Harakeh, M. N., Kokalova, T., Nemulodi, F., Pellegri, L., Rebeiro, B., Swartz, J. A., Triambak, S., Van Zyl, J. J., & Wheldon, C. (2017). Refuting the nature of the sixth 0⁺ Hoyle-analogue state candidate in ¹⁶O. Proceedings of Science, 281(September 2016), Article 040. Advance online publication. https://doi.org/10.22323/1.281.0040

@article{25bf756b036948ff983aa8cd64d93f40,

title = "Refuting the nature of the sixth 0+ Hoyle-analogue state candidate in 16O",

abstract = "A prominent candidate for a Hoyle-analogue state in 16O is the 0+ 6 state, previously observed at Ex = 15.097(5) MeV. This state is identified by several theoretical cluster calculations to be a good candidate for the 4-α cluster state, analogous to the Hoyle state in 12C. Whilst much theoretical work has been performed to reconcile a calculated α-cluster state with this resonance, the experimental information on this state remained very scarce. To investigate this state, the 16O(α, α') reaction was studied at θlab = 0° at an incident energy of Elab = 200 MeV using the K600 magnetic spectrometer at iThemba LABS. For the first time, the decay channels of the Ex = 15.097(5) MeV state were isolated using a large acceptance silicon-strip detector array at backward angles. The lineshapes of the states were analysed within a phenomenological R-matrix framework. Results indicate the presence of a resonance at Ex ≈ 15 MeV which does not exhibit a Jπ = 0+ nature.",

author = "Li, {K. C.W.} and P. Adsley and R. Neveling and P. Papka and Smit, {F. D.} and Br{\"u}mmer, {J. W.} and Diget, {C. Aa} and M. Freer and Harakeh, {M. N.} and Tz Kokalova and F. Nemulodi and L. Pellegri and B. Rebeiro and Swartz, {J. A.} and S. Triambak and {Van Zyl}, {J. J.} and C. Wheldon",

year = "2017",

month = dec,

day = "1",

doi = "10.22323/1.281.0040",

language = "English",

volume = "281",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab",

number = "September 2016",

note = "26th International Nuclear Physics Conference, INPC 2016 ; Conference date: 11-09-2016 Through 16-09-2016",

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Li, KCW, Adsley, P, Neveling, R, Papka, P, Smit, FD, Brümmer, JW, Diget, CA, Freer, M, Harakeh, MN, Kokalova, T, Nemulodi, F, Pellegri, L, Rebeiro, B, Swartz, JA, Triambak, S, Van Zyl, JJ & Wheldon, C 2017, 'Refuting the nature of the sixth 0⁺ Hoyle-analogue state candidate in ¹⁶O', Proceedings of Science, vol. 281, no. September 2016, 040. https://doi.org/10.22323/1.281.0040

TY - JOUR

T1 - Refuting the nature of the sixth 0+ Hoyle-analogue state candidate in 16O

AU - Li, K. C.W.

AU - Adsley, P.

AU - Neveling, R.

AU - Papka, P.

AU - Smit, F. D.

AU - Brümmer, J. W.

AU - Diget, C. Aa

AU - Freer, M.

AU - Harakeh, M. N.

AU - Kokalova, Tz

AU - Nemulodi, F.

AU - Pellegri, L.

AU - Rebeiro, B.

AU - Swartz, J. A.

AU - Triambak, S.

AU - Van Zyl, J. J.

AU - Wheldon, C.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - A prominent candidate for a Hoyle-analogue state in 16O is the 0+ 6 state, previously observed at Ex = 15.097(5) MeV. This state is identified by several theoretical cluster calculations to be a good candidate for the 4-α cluster state, analogous to the Hoyle state in 12C. Whilst much theoretical work has been performed to reconcile a calculated α-cluster state with this resonance, the experimental information on this state remained very scarce. To investigate this state, the 16O(α, α') reaction was studied at θlab = 0° at an incident energy of Elab = 200 MeV using the K600 magnetic spectrometer at iThemba LABS. For the first time, the decay channels of the Ex = 15.097(5) MeV state were isolated using a large acceptance silicon-strip detector array at backward angles. The lineshapes of the states were analysed within a phenomenological R-matrix framework. Results indicate the presence of a resonance at Ex ≈ 15 MeV which does not exhibit a Jπ = 0+ nature.

AB - A prominent candidate for a Hoyle-analogue state in 16O is the 0+ 6 state, previously observed at Ex = 15.097(5) MeV. This state is identified by several theoretical cluster calculations to be a good candidate for the 4-α cluster state, analogous to the Hoyle state in 12C. Whilst much theoretical work has been performed to reconcile a calculated α-cluster state with this resonance, the experimental information on this state remained very scarce. To investigate this state, the 16O(α, α') reaction was studied at θlab = 0° at an incident energy of Elab = 200 MeV using the K600 magnetic spectrometer at iThemba LABS. For the first time, the decay channels of the Ex = 15.097(5) MeV state were isolated using a large acceptance silicon-strip detector array at backward angles. The lineshapes of the states were analysed within a phenomenological R-matrix framework. Results indicate the presence of a resonance at Ex ≈ 15 MeV which does not exhibit a Jπ = 0+ nature.

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M3 - Conference article

AN - SCOPUS:85034567922

SN - 1824-8039

VL - 281

JO - Proceedings of Science

JF - Proceedings of Science

IS - September 2016

M1 - 040

T2 - 26th International Nuclear Physics Conference, INPC 2016

Y2 - 11 September 2016 through 16 September 2016

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