An improved upper limit on the direct 3 α decay of the Hoyle state

Jack Bishop; Robin Smith; Tzany Kokalova; Carl Wheldon; Neil Curtis; Martin Freer; David Parker

doi:10.1063/1.5078854

An improved upper limit on the direct 3 α decay of the Hoyle state

Jack Bishop^*, Robin Smith, Tzany Kokalova, Carl Wheldon, Neil Curtis, Martin Freer, David Parker

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

139 Downloads (Pure)

Abstract

The structure of the Hoyle state, a near-threshold 0⁺ state of extreme astrophysical significance in ¹²C has long been investigated. An experiment was performed to measure the branching ratio for the decay of this state directly into 3 α-particles. Such a branching ratio is expected to be a good observable for whether the resonance can be described as a dilute gas of α- particles known as an α-condensate. This experiment gave the best upper limits to date for this direct decay via the improvement of the traditionally used DDΦ model to isotropic decay to the available phase space. The new DDP² model includes three-body penetrabilities and gives a limit of < 0.026% (95% C.L.), a factor of 5 improvement over the previous experimentally obtained limit.

Original language	English
Title of host publication	Proceedings of the 4th International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2018
Editors	Marina Barbui, Charles M. Folden III, Vladilen Z. Goldberg, Grigory V. Rogachev
Publisher	AIP Publishing
Number of pages	9
ISBN (Electronic)	9780735417649
DOIs	https://doi.org/10.1063/1.5078854
Publication status	E-pub ahead of print - 13 Nov 2018
Event	4th International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2018 - Galveston, United States Duration: 13 May 2018 → 18 May 2018

Publication series

Name	AIP Conference Proceedings
Publisher	AIP Publishing
Number	1
Volume	2038
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	4th International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2018
Country/Territory	United States
City	Galveston
Period	13/05/18 → 18/05/18

ASJC Scopus subject areas

General Physics and Astronomy

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10.1063/1.5078854Licence: None: All rights reserved

Jack_Bishop_et_al_An_improved_upper_limit_on_the_direct_3_α_decay_of_the_Hoyle_state_SOTANCP_2018_2018
Checked for eligibility: 20/12/2018 This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in: Bishop, J., Smith, R., Kokalova, T., Wheldon, C., Curtis, N., Freer, M. and Parker, D., 2018, November. An improved upper limit on the direct 3 α decay of the Hoyle state. In AIP Conference Proceedings (Vol. 2038, No. 1, p. 020035). AIP Publishing and may be found at: https://doi.org/10.1063/1.5078854
Final published version, 2.19 MBLicence: Other (please specify with Rights Statement)

Cite this

Bishop, J., Smith, R., Kokalova, T., Wheldon, C., Curtis, N., Freer, M., & Parker, D. (2018). An improved upper limit on the direct 3 α decay of the Hoyle state. In M. Barbui, C. M. Folden III, V. Z. Goldberg, & G. V. Rogachev (Eds.), Proceedings of the 4th International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2018 Article 020035 (AIP Conference Proceedings; Vol. 2038, No. 1). AIP Publishing. Advance online publication. https://doi.org/10.1063/1.5078854

Bishop, Jack ; Smith, Robin ; Kokalova, Tzany et al. / An improved upper limit on the direct 3 α decay of the Hoyle state. Proceedings of the 4th International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2018. editor / Marina Barbui ; Charles M. Folden III ; Vladilen Z. Goldberg ; Grigory V. Rogachev. AIP Publishing, 2018. (AIP Conference Proceedings; 1).

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title = "An improved upper limit on the direct 3 α decay of the Hoyle state",

abstract = "The structure of the Hoyle state, a near-threshold 0+ state of extreme astrophysical significance in 12C has long been investigated. An experiment was performed to measure the branching ratio for the decay of this state directly into 3 α-particles. Such a branching ratio is expected to be a good observable for whether the resonance can be described as a dilute gas of α- particles known as an α-condensate. This experiment gave the best upper limits to date for this direct decay via the improvement of the traditionally used DDΦ model to isotropic decay to the available phase space. The new DDP2 model includes three-body penetrabilities and gives a limit of < 0.026% (95% C.L.), a factor of 5 improvement over the previous experimentally obtained limit.",

author = "Jack Bishop and Robin Smith and Tzany Kokalova and Carl Wheldon and Neil Curtis and Martin Freer and David Parker",

year = "2018",

month = nov,

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language = "English",

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booktitle = "Proceedings of the 4th International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2018",

address = "United States",

note = "4th International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2018 ; Conference date: 13-05-2018 Through 18-05-2018",

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Bishop, J, Smith, R, Kokalova, T , Wheldon, C , Curtis, N , Freer, M & Parker, D 2018, An improved upper limit on the direct 3 α decay of the Hoyle state. in M Barbui, CM Folden III, VZ Goldberg & GV Rogachev (eds), Proceedings of the 4th International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2018., 020035, AIP Conference Proceedings, no. 1, vol. 2038, AIP Publishing, 4th International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2018, Galveston, United States, 13/05/18. https://doi.org/10.1063/1.5078854

An improved upper limit on the direct 3 α decay of the Hoyle state. / Bishop, Jack; Smith, Robin; Kokalova, Tzany et al.
Proceedings of the 4th International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2018. ed. / Marina Barbui; Charles M. Folden III; Vladilen Z. Goldberg; Grigory V. Rogachev. AIP Publishing, 2018. 020035 (AIP Conference Proceedings; Vol. 2038, No. 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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T1 - An improved upper limit on the direct 3 α decay of the Hoyle state

AU - Bishop, Jack

AU - Smith, Robin

AU - Kokalova, Tzany

AU - Wheldon, Carl

AU - Curtis, Neil

AU - Freer, Martin

AU - Parker, David

PY - 2018/11/13

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N2 - The structure of the Hoyle state, a near-threshold 0+ state of extreme astrophysical significance in 12C has long been investigated. An experiment was performed to measure the branching ratio for the decay of this state directly into 3 α-particles. Such a branching ratio is expected to be a good observable for whether the resonance can be described as a dilute gas of α- particles known as an α-condensate. This experiment gave the best upper limits to date for this direct decay via the improvement of the traditionally used DDΦ model to isotropic decay to the available phase space. The new DDP2 model includes three-body penetrabilities and gives a limit of < 0.026% (95% C.L.), a factor of 5 improvement over the previous experimentally obtained limit.

AB - The structure of the Hoyle state, a near-threshold 0+ state of extreme astrophysical significance in 12C has long been investigated. An experiment was performed to measure the branching ratio for the decay of this state directly into 3 α-particles. Such a branching ratio is expected to be a good observable for whether the resonance can be described as a dilute gas of α- particles known as an α-condensate. This experiment gave the best upper limits to date for this direct decay via the improvement of the traditionally used DDΦ model to isotropic decay to the available phase space. The new DDP2 model includes three-body penetrabilities and gives a limit of < 0.026% (95% C.L.), a factor of 5 improvement over the previous experimentally obtained limit.

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Bishop J, Smith R, Kokalova T , Wheldon C , Curtis N , Freer M et al. An improved upper limit on the direct 3 α decay of the Hoyle state. In Barbui M, Folden III CM, Goldberg VZ, Rogachev GV, editors, Proceedings of the 4th International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2018. AIP Publishing. 2018. 020035. (AIP Conference Proceedings; 1). Epub 2018 Nov 13. doi: 10.1063/1.5078854

An improved upper limit on the direct 3 α decay of the Hoyle state

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