Breakup channels for C-12 triple-alpha continuum states

Christian Aaen Diget; F. C. Barker; M. J. G. Borge; R. Boutami; P. Dendooven; T. Eronen; S. P. Fox; B. R. Fulton; H. O. U. Fynbo; J. Huikari; S. Hyldegaard; H. B. Jeppesen; A. Jokinen; B. Jonson; A. Kankainen; I. Moore; A. Nieminen; G. Nyman; H. Penttila; V. F. E. Pucknell; K. Riisager; S. Rinta-Antila; O. Tengblad; Y. Wang; K. Wilhelmsen; J. Aysto

doi:10.1103/PhysRevC.80.034316

Breakup channels for C-12 triple-alpha continuum states

Christian Aaen Diget, F. C. Barker, M. J. G. Borge, R. Boutami, P. Dendooven, T. Eronen, S. P. Fox, B. R. Fulton, H. O. U. Fynbo, J. Huikari, S. Hyldegaard, H. B. Jeppesen, A. Jokinen, B. Jonson, A. Kankainen, I. Moore, A. Nieminen, G. Nyman, H. Penttila, V. F. E. PucknellK. Riisager, S. Rinta-Antila, O. Tengblad, Y. Wang, K. Wilhelmsen, J. Aysto

Physics

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

Abstract

The triple-alpha-particle breakup of states in the triple-alpha continuum of C-12 has been investigated by way of coincident detection of all three alpha particles of the breakup. The states have been fed in the beta decay of N-12 and B-12, and the alpha particles measured using a setup that covers all of the triple-alpha phase space. Contributions from the breakup through the Be-8(0(+)) ground state as well as other channels-interpreted as breakup through excited energies in Be-8-have been identified. Spins and parities of C-12 triple-alpha continuum states are deduced from the measured phase-space distributions for breakup through Be-8 above the ground state by comparison to a fully symmetrized sequential R-matrix description of the breakup. At around 10 MeV in C-12, the breakup is found to be dominated by 0(+) strength breaking up through the ghost of the Be-8(0(+)) ground state with L = 0 angular momentum between the first emitted alpha particle and the intermediate Be-8 nucleus. For C-12 energies above the 12.7 MeV 1(+) state, however, L = 2 breakup of a C-12 2(+) state through the Be-8(2(+)) excited state dominates. Furthermore, the possibility of a 2(+) excited state in the 9-12 MeV region of C-12 is investigated.

Original language	English
Article number	034316
Pages (from-to)	1-16
Number of pages	16
Journal	Physical Review C
Volume	80
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.80.034316
Publication status	Published - 22 Sept 2009

Keywords

ENERGY-LEVELS
LIGHT-NUCLEI
DECAY
RESONANCES
PARTICLE
RATES
BE-8

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10.1103/PhysRevC.80.034316

http://prc.aps.org/abstract/PRC/v80/i3/e034316

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Diget, C. A., Barker, F. C., Borge, M. J. G., Boutami, R., Dendooven, P., Eronen, T., Fox, S. P., Fulton, B. R., Fynbo, H. O. U., Huikari, J., Hyldegaard, S., Jeppesen, H. B., Jokinen, A., Jonson, B., Kankainen, A., Moore, I., Nieminen, A., Nyman, G., Penttila, H., ... Aysto, J. (2009). Breakup channels for C-12 triple-alpha continuum states. Physical Review C, 80(3), 1-16. Article 034316. https://doi.org/10.1103/PhysRevC.80.034316

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title = "Breakup channels for C-12 triple-alpha continuum states",

abstract = "The triple-alpha-particle breakup of states in the triple-alpha continuum of C-12 has been investigated by way of coincident detection of all three alpha particles of the breakup. The states have been fed in the beta decay of N-12 and B-12, and the alpha particles measured using a setup that covers all of the triple-alpha phase space. Contributions from the breakup through the Be-8(0(+)) ground state as well as other channels-interpreted as breakup through excited energies in Be-8-have been identified. Spins and parities of C-12 triple-alpha continuum states are deduced from the measured phase-space distributions for breakup through Be-8 above the ground state by comparison to a fully symmetrized sequential R-matrix description of the breakup. At around 10 MeV in C-12, the breakup is found to be dominated by 0(+) strength breaking up through the ghost of the Be-8(0(+)) ground state with L = 0 angular momentum between the first emitted alpha particle and the intermediate Be-8 nucleus. For C-12 energies above the 12.7 MeV 1(+) state, however, L = 2 breakup of a C-12 2(+) state through the Be-8(2(+)) excited state dominates. Furthermore, the possibility of a 2(+) excited state in the 9-12 MeV region of C-12 is investigated.",

keywords = "ENERGY-LEVELS, LIGHT-NUCLEI, DECAY, RESONANCES, PARTICLE, RATES, BE-8",

author = "Diget, {Christian Aaen} and Barker, {F. C.} and Borge, {M. J. G.} and R. Boutami and P. Dendooven and T. Eronen and Fox, {S. P.} and Fulton, {B. R.} and Fynbo, {H. O. U.} and J. Huikari and S. Hyldegaard and Jeppesen, {H. B.} and A. Jokinen and B. Jonson and A. Kankainen and I. Moore and A. Nieminen and G. Nyman and H. Penttila and Pucknell, {V. F. E.} and K. Riisager and S. Rinta-Antila and O. Tengblad and Y. Wang and K. Wilhelmsen and J. Aysto",

year = "2009",

month = sep,

day = "22",

doi = "10.1103/PhysRevC.80.034316",

language = "English",

volume = "80",

pages = "1--16",

journal = "Physical Review C",

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Diget, CA, Barker, FC, Borge, MJG, Boutami, R, Dendooven, P, Eronen, T, Fox, SP, Fulton, BR, Fynbo, HOU, Huikari, J, Hyldegaard, S, Jeppesen, HB, Jokinen, A, Jonson, B, Kankainen, A, Moore, I, Nieminen, A, Nyman, G, Penttila, H, Pucknell, VFE, Riisager, K, Rinta-Antila, S, Tengblad, O, Wang, Y, Wilhelmsen, K & Aysto, J 2009, 'Breakup channels for C-12 triple-alpha continuum states', Physical Review C, vol. 80, no. 3, 034316, pp. 1-16. https://doi.org/10.1103/PhysRevC.80.034316

TY - JOUR

T1 - Breakup channels for C-12 triple-alpha continuum states

AU - Diget, Christian Aaen

AU - Barker, F. C.

AU - Borge, M. J. G.

AU - Boutami, R.

AU - Dendooven, P.

AU - Eronen, T.

AU - Fox, S. P.

AU - Fulton, B. R.

AU - Fynbo, H. O. U.

AU - Huikari, J.

AU - Hyldegaard, S.

AU - Jeppesen, H. B.

AU - Jokinen, A.

AU - Jonson, B.

AU - Kankainen, A.

AU - Moore, I.

AU - Nieminen, A.

AU - Nyman, G.

AU - Penttila, H.

AU - Pucknell, V. F. E.

AU - Riisager, K.

AU - Rinta-Antila, S.

AU - Tengblad, O.

AU - Wang, Y.

AU - Wilhelmsen, K.

AU - Aysto, J.

PY - 2009/9/22

Y1 - 2009/9/22

N2 - The triple-alpha-particle breakup of states in the triple-alpha continuum of C-12 has been investigated by way of coincident detection of all three alpha particles of the breakup. The states have been fed in the beta decay of N-12 and B-12, and the alpha particles measured using a setup that covers all of the triple-alpha phase space. Contributions from the breakup through the Be-8(0(+)) ground state as well as other channels-interpreted as breakup through excited energies in Be-8-have been identified. Spins and parities of C-12 triple-alpha continuum states are deduced from the measured phase-space distributions for breakup through Be-8 above the ground state by comparison to a fully symmetrized sequential R-matrix description of the breakup. At around 10 MeV in C-12, the breakup is found to be dominated by 0(+) strength breaking up through the ghost of the Be-8(0(+)) ground state with L = 0 angular momentum between the first emitted alpha particle and the intermediate Be-8 nucleus. For C-12 energies above the 12.7 MeV 1(+) state, however, L = 2 breakup of a C-12 2(+) state through the Be-8(2(+)) excited state dominates. Furthermore, the possibility of a 2(+) excited state in the 9-12 MeV region of C-12 is investigated.

AB - The triple-alpha-particle breakup of states in the triple-alpha continuum of C-12 has been investigated by way of coincident detection of all three alpha particles of the breakup. The states have been fed in the beta decay of N-12 and B-12, and the alpha particles measured using a setup that covers all of the triple-alpha phase space. Contributions from the breakup through the Be-8(0(+)) ground state as well as other channels-interpreted as breakup through excited energies in Be-8-have been identified. Spins and parities of C-12 triple-alpha continuum states are deduced from the measured phase-space distributions for breakup through Be-8 above the ground state by comparison to a fully symmetrized sequential R-matrix description of the breakup. At around 10 MeV in C-12, the breakup is found to be dominated by 0(+) strength breaking up through the ghost of the Be-8(0(+)) ground state with L = 0 angular momentum between the first emitted alpha particle and the intermediate Be-8 nucleus. For C-12 energies above the 12.7 MeV 1(+) state, however, L = 2 breakup of a C-12 2(+) state through the Be-8(2(+)) excited state dominates. Furthermore, the possibility of a 2(+) excited state in the 9-12 MeV region of C-12 is investigated.

KW - ENERGY-LEVELS

KW - LIGHT-NUCLEI

KW - DECAY

KW - RESONANCES

KW - PARTICLE

KW - RATES

KW - BE-8

UR - http://www.scopus.com/inward/record.url?scp=70349798855&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.80.034316

DO - 10.1103/PhysRevC.80.034316

M3 - Article

SN - 2469-9985

VL - 80

SP - 1

EP - 16

JO - Physical Review C

JF - Physical Review C

IS - 3

M1 - 034316

ER -

Breakup channels for C-12 triple-alpha continuum states

Abstract

Keywords

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