Decay path measurements for the 2.429 MeV state in Be9: Implications for the astrophysical α+α+n reaction

P. Papka; T. A.D. Brown; B. R. Fulton; D. L. Watson; S. P. Fox; D. Groombridge; M. Freer; N. M. Clarke; N. I. Ashwood; N. Curtis; V. Ziman; P. McEwan; S. Ahmed; W. N. Catford; D. Mahboub; C. N. Timis; T. D. Baldwin; D. C. Weisser

doi:10.1103/PhysRevC.75.045803

Decay path measurements for the 2.429 MeV state in Be9: Implications for the astrophysical α+α+n reaction

P. Papka^*, T. A.D. Brown, B. R. Fulton, D. L. Watson, S. P. Fox, D. Groombridge, M. Freer, N. M. Clarke, N. I. Ashwood, N. Curtis, V. Ziman, P. McEwan, S. Ahmed, W. N. Catford, D. Mahboub, C. N. Timis, T. D. Baldwin, D. C. Weisser

^*Corresponding author for this work

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

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Abstract

An experiment was performed at the Australian National University to study the Be9(Li6,Li6)Be9*→α+α+n reaction. This experiment was designed to study the breakup of Be9, in an attempt to quantify the contribution played by the He5+α and 8Be2++n channels for the low lying excited states. This information is required in order to resolve uncertainties in the α+α+n→ Be9 reaction rate in high-energy and neutron-rich astrophysical environments such as supernovae. Angular correlation measurements have been used to deduce that the 2.429 MeV state breaks up almost exclusively via the 8Be2+ channel. This method of identifying the break-up channel resolves the problem of distinguishing between the 8Be2+ and 5Heg.s. channels which are kinetically identical at this excitation energy.

Original language	English
Article number	045803
Journal	Physical Review C - Nuclear Physics
Volume	75
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.75.045803
Publication status	Published - 12 Apr 2007

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Papka, P., Brown, T. A. D., Fulton, B. R., Watson, D. L., Fox, S. P., Groombridge, D., Freer, M., Clarke, N. M., Ashwood, N. I., Curtis, N., Ziman, V., McEwan, P., Ahmed, S., Catford, W. N., Mahboub, D., Timis, C. N., Baldwin, T. D., & Weisser, D. C. (2007). Decay path measurements for the 2.429 MeV state in Be9: Implications for the astrophysical α+α+n reaction. Physical Review C - Nuclear Physics, 75(4), Article 045803. https://doi.org/10.1103/PhysRevC.75.045803

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title = "Decay path measurements for the 2.429 MeV state in Be9: Implications for the astrophysical α+α+n reaction",

abstract = "An experiment was performed at the Australian National University to study the Be9(Li6,Li6)Be9*→α+α+n reaction. This experiment was designed to study the breakup of Be9, in an attempt to quantify the contribution played by the He5+α and 8Be2++n channels for the low lying excited states. This information is required in order to resolve uncertainties in the α+α+n→ Be9 reaction rate in high-energy and neutron-rich astrophysical environments such as supernovae. Angular correlation measurements have been used to deduce that the 2.429 MeV state breaks up almost exclusively via the 8Be2+ channel. This method of identifying the break-up channel resolves the problem of distinguishing between the 8Be2+ and 5Heg.s. channels which are kinetically identical at this excitation energy.",

author = "P. Papka and Brown, {T. A.D.} and Fulton, {B. R.} and Watson, {D. L.} and Fox, {S. P.} and D. Groombridge and M. Freer and Clarke, {N. M.} and Ashwood, {N. I.} and N. Curtis and V. Ziman and P. McEwan and S. Ahmed and Catford, {W. N.} and D. Mahboub and Timis, {C. N.} and Baldwin, {T. D.} and Weisser, {D. C.}",

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doi = "10.1103/PhysRevC.75.045803",

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Papka, P, Brown, TAD, Fulton, BR, Watson, DL, Fox, SP, Groombridge, D, Freer, M, Clarke, NM, Ashwood, NI, Curtis, N, Ziman, V, McEwan, P, Ahmed, S, Catford, WN, Mahboub, D, Timis, CN, Baldwin, TD & Weisser, DC 2007, 'Decay path measurements for the 2.429 MeV state in Be9: Implications for the astrophysical α+α+n reaction', Physical Review C - Nuclear Physics, vol. 75, no. 4, 045803. https://doi.org/10.1103/PhysRevC.75.045803

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AU - Brown, T. A.D.

AU - Fulton, B. R.

AU - Watson, D. L.

AU - Fox, S. P.

AU - Groombridge, D.

AU - Freer, M.

AU - Clarke, N. M.

AU - Ashwood, N. I.

AU - Curtis, N.

AU - Ziman, V.

AU - McEwan, P.

AU - Ahmed, S.

AU - Catford, W. N.

AU - Mahboub, D.

AU - Timis, C. N.

AU - Baldwin, T. D.

AU - Weisser, D. C.

PY - 2007/4/12

Y1 - 2007/4/12

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AB - An experiment was performed at the Australian National University to study the Be9(Li6,Li6)Be9*→α+α+n reaction. This experiment was designed to study the breakup of Be9, in an attempt to quantify the contribution played by the He5+α and 8Be2++n channels for the low lying excited states. This information is required in order to resolve uncertainties in the α+α+n→ Be9 reaction rate in high-energy and neutron-rich astrophysical environments such as supernovae. Angular correlation measurements have been used to deduce that the 2.429 MeV state breaks up almost exclusively via the 8Be2+ channel. This method of identifying the break-up channel resolves the problem of distinguishing between the 8Be2+ and 5Heg.s. channels which are kinetically identical at this excitation energy.

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JF - Physical Review C - Nuclear Physics

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Decay path measurements for the 2.429 MeV state in Be9: Implications for the astrophysical α+α+n reaction

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