Excited states of 12C above the alpha-decay threshold

Martin Freer; S Almaraz-Calderon; A Aprahamian; Nicholas Ashwood; Matthew Barr; B Bucher; P Copp; M Couder; Neil Curtis; X Fang; F Jung; S Lesher; W Lu; Jonathan Malcolm; A Roberts; WP Tan; Carl Wheldon; VA Ziman

doi:10.1088/1742-6596/321/1/012036

Excited states of ¹²C above the alpha-decay threshold

Martin Freer
, S Almaraz-Calderon
, A Aprahamian
, Nicholas Ashwood
, Matthew Barr
, B Bucher
, P Copp
, M Couder
, Neil Curtis
, X Fang
, F Jung
, S Lesher
, W Lu
, Jonathan Malcolm
, A Roberts
, WP Tan
, Carl Wheldon
, VA Ziman

Physics and Astronomy

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

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Abstract

The excitation energy spectrum of ¹²C is important for both structural and astrophysical reasons; here we present evidence for a new state in ¹²C. The two reactions ¹²C(⁴He, ⁴He+⁴He+⁴He)⁴He and ⁹Be(⁴He,⁴He+⁴He+⁴He)n were measured using an array of four double sided strip detectors. Excited states in ¹²C were reconstructed filtered by the condition that the alpha-decay proceeded via the ⁸Be ground-state. In both measurements evidence was found for a new state at 13.3(0.2) MeV with a width 1.7(0.2) MeV. Angular correlation measurements from the¹²C(⁴He, ⁴He+⁴He+⁴He)⁴He reaction indicates that the state may have J^pi =4⁺. © Published under licence by IOP Publishing Ltd.

Original language	English
Article number	012036
Journal	Journal of Physics: Conference Series
Volume	321
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/321/1/012036
Publication status	Published - 16 Sept 2011

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C12 excited states
Published in: Journal of Physics: Conference Series.
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Freer, M., Almaraz-Calderon, S., Aprahamian, A., Ashwood, N., Barr, M., Bucher, B., Copp, P., Couder, M., Curtis, N., Fang, X., Jung, F., Lesher, S., Lu, W., Malcolm, J., Roberts, A., Tan, WP., Wheldon, C., & Ziman, VA. (2011). Excited states of ¹²C above the alpha-decay threshold. Journal of Physics: Conference Series, 321(1), Article 012036. https://doi.org/10.1088/1742-6596/321/1/012036

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title = "Excited states of 12C above the alpha-decay threshold",

abstract = "The excitation energy spectrum of 12C is important for both structural and astrophysical reasons; here we present evidence for a new state in 12C. The two reactions 12C(4He, 4He+4He+4He)4He and 9Be(4He,4He+4He+4He)n were measured using an array of four double sided strip detectors. Excited states in 12C were reconstructed filtered by the condition that the alpha-decay proceeded via the 8Be ground-state. In both measurements evidence was found for a new state at 13.3(0.2) MeV with a width 1.7(0.2) MeV. Angular correlation measurements from the 12C(4He, 4He+4He+4He)4He reaction indicates that the state may have Jpi =4+. {\textcopyright} Published under licence by IOP Publishing Ltd.",

author = "Martin Freer and S Almaraz-Calderon and A Aprahamian and Nicholas Ashwood and Matthew Barr and B Bucher and P Copp and M Couder and Neil Curtis and X Fang and F Jung and S Lesher and W Lu and Jonathan Malcolm and A Roberts and WP Tan and Carl Wheldon and VA Ziman",

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Freer, M, Almaraz-Calderon, S, Aprahamian, A, Ashwood, N, Barr, M, Bucher, B, Copp, P, Couder, M, Curtis, N, Fang, X, Jung, F, Lesher, S, Lu, W, Malcolm, J, Roberts, A, Tan, WP, Wheldon, C & Ziman, VA 2011, 'Excited states of ¹²C above the alpha-decay threshold', Journal of Physics: Conference Series, vol. 321, no. 1, 012036. https://doi.org/10.1088/1742-6596/321/1/012036

TY - JOUR

T1 - Excited states of 12C above the alpha-decay threshold

AU - Freer, Martin

AU - Almaraz-Calderon, S

AU - Aprahamian, A

AU - Ashwood, Nicholas

AU - Barr, Matthew

AU - Bucher, B

AU - Copp, P

AU - Couder, M

AU - Curtis, Neil

AU - Fang, X

AU - Jung, F

AU - Lesher, S

AU - Lu, W

AU - Malcolm, Jonathan

AU - Roberts, A

AU - Tan, WP

AU - Wheldon, Carl

AU - Ziman, VA

PY - 2011/9/16

Y1 - 2011/9/16

N2 - The excitation energy spectrum of 12C is important for both structural and astrophysical reasons; here we present evidence for a new state in 12C. The two reactions 12C(4He, 4He+4He+4He)4He and 9Be(4He,4He+4He+4He)n were measured using an array of four double sided strip detectors. Excited states in 12C were reconstructed filtered by the condition that the alpha-decay proceeded via the 8Be ground-state. In both measurements evidence was found for a new state at 13.3(0.2) MeV with a width 1.7(0.2) MeV. Angular correlation measurements from the 12C(4He, 4He+4He+4He)4He reaction indicates that the state may have Jpi =4+. © Published under licence by IOP Publishing Ltd.

AB - The excitation energy spectrum of 12C is important for both structural and astrophysical reasons; here we present evidence for a new state in 12C. The two reactions 12C(4He, 4He+4He+4He)4He and 9Be(4He,4He+4He+4He)n were measured using an array of four double sided strip detectors. Excited states in 12C were reconstructed filtered by the condition that the alpha-decay proceeded via the 8Be ground-state. In both measurements evidence was found for a new state at 13.3(0.2) MeV with a width 1.7(0.2) MeV. Angular correlation measurements from the 12C(4He, 4He+4He+4He)4He reaction indicates that the state may have Jpi =4+. © Published under licence by IOP Publishing Ltd.

UR - https://www.scopus.com/pages/publications/81355142139

U2 - 10.1088/1742-6596/321/1/012036

DO - 10.1088/1742-6596/321/1/012036

M3 - Article

SN - 1742-6596

VL - 321

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

IS - 1

M1 - 012036

ER -

Excited states of 12C above the alpha-decay threshold

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Excited states of ¹²C above the alpha-decay threshold