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

Research output: Contribution to journal › Conference article › peer-review

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
DOIs	https://doi.org/10.22323/1.281.0040
Publication status	Published - 9 May 2017
Event	26th International Nuclear Physics Conference, INPC 2016 - Adelaide, Australia Duration: 11 Sept 2016 → 16 Sept 2016

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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, Article 040. https://doi.org/10.22323/1.281.0040

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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 = may,

day = "9",

doi = "10.22323/1.281.0040",

language = "English",

volume = "281",

journal = "Proceedings of Science",

issn = "1824-8039",

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

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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 - 2017/5/9

Y1 - 2017/5/9

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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U2 - 10.22323/1.281.0040

DO - 10.22323/1.281.0040

M3 - Conference article

AN - SCOPUS:85034567922

SN - 1824-8039

VL - 281

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 040

T2 - 26th International Nuclear Physics Conference, INPC 2016

Y2 - 11 September 2016 through 16 September 2016

ER -

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

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