9Be(α, p)12B reaction and primordial nucleosynthesis

R. N. Boyd; S. Kubono; N. Ikeda; M. Y. Tanaka; T. Nomura; Y. Fuchi; H. Kawashima; M. Ohura; H. Orihara; S. Yun; H. Tokyokawa; M. Yosoi; H. Ohnuma

doi:10.1016/0375-9474(92)90399-5

⁹Be(α, p)¹²B reaction and primordial nucleosynthesis

R. N. Boyd, S. Kubono, N. Ikeda, M. Y. Tanaka, T. Nomura, Y. Fuchi, H. Kawashima, M. Ohura, H. Orihara, S. Yun, H. Tokyokawa, M. Yosoi, H. Ohnuma

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Abstract

The high-lying levels of ¹²B have been studied via the ⁹Be(α, p)¹²B reaction using 65 MeV α-particles. The reaction protons were analyzed with a quadrupole-dipole-dipole spectrograph, yielding a resolution of about 40 keV. Angular distributions were measured for 20 states ranging in excitation energy from 7.55 to 13.31 MeV. Results of DWBA calculations were compared to the angular distributions to attempt to set limits on the angular momentum transfers. The states seen at excitation energies of 10.57 and 13.31 MeV have potential significance to models of primordial nucleosynthesis via their possible importance to the ⁸Li(α, n)¹¹B and ⁹Be(t, p)¹¹B reactions respectively. A new reaction rate for the latter reaction was obtained.

Original language	English
Pages (from-to)	97-107
Number of pages	11
Journal	Nuclear Physics, Section A
Volume	542
Issue number	1
DOIs	https://doi.org/10.1016/0375-9474(92)90399-5
Publication status	Published - Jun 1 1992
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1016/0375-9474(92)90399-5

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Boyd, R. N., Kubono, S., Ikeda, N., Tanaka, M. Y., Nomura, T., Fuchi, Y., Kawashima, H., Ohura, M., Orihara, H., Yun, S., Tokyokawa, H., Yosoi, M., & Ohnuma, H. (1992). ⁹Be(α, p)¹²B reaction and primordial nucleosynthesis. Nuclear Physics, Section A, 542(1), 97-107. https://doi.org/10.1016/0375-9474(92)90399-5

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title = "9Be(α, p)12B reaction and primordial nucleosynthesis",

abstract = "The high-lying levels of 12B have been studied via the 9Be(α, p)12B reaction using 65 MeV α-particles. The reaction protons were analyzed with a quadrupole-dipole-dipole spectrograph, yielding a resolution of about 40 keV. Angular distributions were measured for 20 states ranging in excitation energy from 7.55 to 13.31 MeV. Results of DWBA calculations were compared to the angular distributions to attempt to set limits on the angular momentum transfers. The states seen at excitation energies of 10.57 and 13.31 MeV have potential significance to models of primordial nucleosynthesis via their possible importance to the 8Li(α, n)11B and 9Be(t, p)11B reactions respectively. A new reaction rate for the latter reaction was obtained.",

author = "Boyd, {R. N.} and S. Kubono and N. Ikeda and Tanaka, {M. Y.} and T. Nomura and Y. Fuchi and H. Kawashima and M. Ohura and H. Orihara and S. Yun and H. Tokyokawa and M. Yosoi and H. Ohnuma",

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T1 - 9Be(α, p)12B reaction and primordial nucleosynthesis

AU - Boyd, R. N.

AU - Kubono, S.

AU - Ikeda, N.

AU - Tanaka, M. Y.

AU - Nomura, T.

AU - Fuchi, Y.

AU - Kawashima, H.

AU - Ohura, M.

AU - Orihara, H.

AU - Yun, S.

AU - Tokyokawa, H.

AU - Yosoi, M.

AU - Ohnuma, H.

PY - 1992/6/1

Y1 - 1992/6/1

N2 - The high-lying levels of 12B have been studied via the 9Be(α, p)12B reaction using 65 MeV α-particles. The reaction protons were analyzed with a quadrupole-dipole-dipole spectrograph, yielding a resolution of about 40 keV. Angular distributions were measured for 20 states ranging in excitation energy from 7.55 to 13.31 MeV. Results of DWBA calculations were compared to the angular distributions to attempt to set limits on the angular momentum transfers. The states seen at excitation energies of 10.57 and 13.31 MeV have potential significance to models of primordial nucleosynthesis via their possible importance to the 8Li(α, n)11B and 9Be(t, p)11B reactions respectively. A new reaction rate for the latter reaction was obtained.

AB - The high-lying levels of 12B have been studied via the 9Be(α, p)12B reaction using 65 MeV α-particles. The reaction protons were analyzed with a quadrupole-dipole-dipole spectrograph, yielding a resolution of about 40 keV. Angular distributions were measured for 20 states ranging in excitation energy from 7.55 to 13.31 MeV. Results of DWBA calculations were compared to the angular distributions to attempt to set limits on the angular momentum transfers. The states seen at excitation energies of 10.57 and 13.31 MeV have potential significance to models of primordial nucleosynthesis via their possible importance to the 8Li(α, n)11B and 9Be(t, p)11B reactions respectively. A new reaction rate for the latter reaction was obtained.

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