Excited states of 8Be populated via the p(7Li, 4He)4He and p(7Li, 4He*) 4He resonant reactions

M. Freer; N. I. Ashwood; N. Curtis; T. Munoz-Britton; C. Wheldon; V. A. Ziman; S. Brown; W. N. Catford; N. P. Patterson; J. S. Thomas; D. C. Weisser

doi:10.1088/0954-3899/35/12/125108

Excited states of ⁸Be populated via the p(⁷Li, ⁴He)⁴He and p(⁷Li, ⁴He*) ⁴He resonant reactions

M. Freer^*, N. I. Ashwood, N. Curtis, T. Munoz-Britton, C. Wheldon, V. A. Ziman, S. Brown, W. N. Catford, N. P. Patterson, J. S. Thomas, D. C. Weisser

^*Corresponding author for this work

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

2 Citations (Scopus)

Abstract

A measurement of the p(⁷Li, ⁴He)⁴He resonant reaction on a thick mylar target was used to probe resonances in ⁸Be in the excitation energy range 20-25 MeV. The ⁷Li beams, of energies 25.8 and 58 MeV, were stopped in the target and the resulting α-particles were detected at zero degrees. Evidence was found for resonances at ∼20 and ∼25 MeV with J^π = 0⁺ and 2⁺ character, respectively. A simultaneous measurement of the p( ⁷Li, ⁴He* → p + t)⁴He reaction was performed, in which one of the two final-state α-particles was produced in the 20.2 MeV excited state. These events were observed to arise from an excitation energy region 23-25 MeV and have been associated with the decay of the 25.2 MeV 2⁺ ⁸Be resonance. The 25.2 MeV resonance is found to have a dominant ⁴He + ⁴He* reduced width.

Original language	English
Article number	125108
Journal	Journal of Physics G: Nuclear and Particle Physics
Volume	35
Issue number	12
DOIs	https://doi.org/10.1088/0954-3899/35/12/125108
Publication status	Published - 1 Dec 2008

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Freer, M., Ashwood, N. I., Curtis, N., Munoz-Britton, T., Wheldon, C., Ziman, V. A., Brown, S., Catford, W. N., Patterson, N. P., Thomas, J. S., & Weisser, D. C. (2008). Excited states of ⁸Be populated via the p(⁷Li, ⁴He)⁴He and p(⁷Li, ⁴He*) ⁴He resonant reactions. Journal of Physics G: Nuclear and Particle Physics, 35(12), Article 125108. https://doi.org/10.1088/0954-3899/35/12/125108

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title = "Excited states of 8Be populated via the p(7Li, 4He)4He and p(7Li, 4He*) 4He resonant reactions",

abstract = "A measurement of the p(7Li, 4He)4He resonant reaction on a thick mylar target was used to probe resonances in 8Be in the excitation energy range 20-25 MeV. The 7Li beams, of energies 25.8 and 58 MeV, were stopped in the target and the resulting α-particles were detected at zero degrees. Evidence was found for resonances at ∼20 and ∼25 MeV with Jπ = 0+ and 2+ character, respectively. A simultaneous measurement of the p( 7Li, 4He* → p + t)4He reaction was performed, in which one of the two final-state α-particles was produced in the 20.2 MeV excited state. These events were observed to arise from an excitation energy region 23-25 MeV and have been associated with the decay of the 25.2 MeV 2+ 8Be resonance. The 25.2 MeV resonance is found to have a dominant 4He + 4He* reduced width.",

author = "M. Freer and Ashwood, {N. I.} and N. Curtis and T. Munoz-Britton and C. Wheldon and Ziman, {V. A.} and S. Brown and Catford, {W. N.} and Patterson, {N. P.} and Thomas, {J. S.} and Weisser, {D. C.}",

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AU - Freer, M.

AU - Ashwood, N. I.

AU - Curtis, N.

AU - Munoz-Britton, T.

AU - Wheldon, C.

AU - Ziman, V. A.

AU - Brown, S.

AU - Catford, W. N.

AU - Patterson, N. P.

AU - Thomas, J. S.

AU - Weisser, D. C.

PY - 2008/12/1

Y1 - 2008/12/1

N2 - A measurement of the p(7Li, 4He)4He resonant reaction on a thick mylar target was used to probe resonances in 8Be in the excitation energy range 20-25 MeV. The 7Li beams, of energies 25.8 and 58 MeV, were stopped in the target and the resulting α-particles were detected at zero degrees. Evidence was found for resonances at ∼20 and ∼25 MeV with Jπ = 0+ and 2+ character, respectively. A simultaneous measurement of the p( 7Li, 4He* → p + t)4He reaction was performed, in which one of the two final-state α-particles was produced in the 20.2 MeV excited state. These events were observed to arise from an excitation energy region 23-25 MeV and have been associated with the decay of the 25.2 MeV 2+ 8Be resonance. The 25.2 MeV resonance is found to have a dominant 4He + 4He* reduced width.

AB - A measurement of the p(7Li, 4He)4He resonant reaction on a thick mylar target was used to probe resonances in 8Be in the excitation energy range 20-25 MeV. The 7Li beams, of energies 25.8 and 58 MeV, were stopped in the target and the resulting α-particles were detected at zero degrees. Evidence was found for resonances at ∼20 and ∼25 MeV with Jπ = 0+ and 2+ character, respectively. A simultaneous measurement of the p( 7Li, 4He* → p + t)4He reaction was performed, in which one of the two final-state α-particles was produced in the 20.2 MeV excited state. These events were observed to arise from an excitation energy region 23-25 MeV and have been associated with the decay of the 25.2 MeV 2+ 8Be resonance. The 25.2 MeV resonance is found to have a dominant 4He + 4He* reduced width.

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DO - 10.1088/0954-3899/35/12/125108

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VL - 35

JO - Journal of Physics G: Nuclear and Particle Physics

JF - Journal of Physics G: Nuclear and Particle Physics

IS - 12

M1 - 125108

ER -

Excited states of ⁸Be populated via the p(⁷Li, ⁴He)⁴He and p(⁷Li, ⁴He*) ⁴He resonant reactions

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