Energy dependence of the astrophysical S factor for the6Li(p, γ)7Be reaction

R. M. Prior; M. C. Spraker; A. M. Amthor; K. J. Keeter; S. O. Nelson; A. Sabourov; K. Sabourov; A. Tonchev; M. Ahmed; J. H. Kelley; D. R. Tilley; H. R. Weller; H. M. Hofmann

doi:10.1103/PhysRevC.70.055801

Energy dependence of the astrophysical S factor for the⁶Li(p, γ)⁷Be reaction

R. M. Prior, M. C. Spraker, A. M. Amthor, K. J. Keeter, S. O. Nelson, A. Sabourov, K. Sabourov, A. Tonchev, M. Ahmed, J. H. Kelley, D. R. Tilley, H. R. Weller, H. M. Hofmann

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Abstract

Polarized proton beams with energies from 80 to 130 keV have been used to determine the slope of the astrophysical S factor for the ⁶Li(p, γ,₀)⁷Be and ⁶Li(p,γ₁) ⁷Be reactions. The slope was determined from the relative yields at five incident proton energies. The slope of the S factor was found to be negative. The analyzing power measurements indicate that the reaction proceeds predominately by s-wave capture. The negative slope does not appear to be due to low-binding-energy effects, the effects of nearby resonances, or electron screening of the nuclei. A resonating group model calculation demonstrates a new mechanism for producing a negative slope at astrophysically relevant energies in radiative capture reactions.

Original language	English
Article number	055801
Pages (from-to)	055801-1-055801-8
Journal	Physical Review C - Nuclear Physics
Volume	70
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.70.055801
State	Published - Nov 2004
Externally published	Yes

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Prior, R. M., Spraker, M. C., Amthor, A. M., Keeter, K. J., Nelson, S. O., Sabourov, A., Sabourov, K., Tonchev, A., Ahmed, M., Kelley, J. H., Tilley, D. R., Weller, H. R., & Hofmann, H. M. (2004). Energy dependence of the astrophysical S factor for the⁶Li(p, γ)⁷Be reaction. Physical Review C - Nuclear Physics, 70(5), 055801-1-055801-8. Article 055801. https://doi.org/10.1103/PhysRevC.70.055801

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title = "Energy dependence of the astrophysical S factor for the6Li(p, γ)7Be reaction",

abstract = "Polarized proton beams with energies from 80 to 130 keV have been used to determine the slope of the astrophysical S factor for the 6Li(p, γ,0)7Be and 6Li(p,γ1) 7Be reactions. The slope was determined from the relative yields at five incident proton energies. The slope of the S factor was found to be negative. The analyzing power measurements indicate that the reaction proceeds predominately by s-wave capture. The negative slope does not appear to be due to low-binding-energy effects, the effects of nearby resonances, or electron screening of the nuclei. A resonating group model calculation demonstrates a new mechanism for producing a negative slope at astrophysically relevant energies in radiative capture reactions.",

author = "Prior, {R. M.} and Spraker, {M. C.} and Amthor, {A. M.} and Keeter, {K. J.} and Nelson, {S. O.} and A. Sabourov and K. Sabourov and A. Tonchev and M. Ahmed and Kelley, {J. H.} and Tilley, {D. R.} and Weller, {H. R.} and Hofmann, {H. M.}",

year = "2004",

month = nov,

doi = "10.1103/PhysRevC.70.055801",

language = "English",

volume = "70",

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journal = "Physical Review C - Nuclear Physics",

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Prior, RM, Spraker, MC, Amthor, AM, Keeter, KJ, Nelson, SO, Sabourov, A, Sabourov, K, Tonchev, A, Ahmed, M, Kelley, JH, Tilley, DR, Weller, HR & Hofmann, HM 2004, 'Energy dependence of the astrophysical S factor for the⁶Li(p, γ)⁷Be reaction', Physical Review C - Nuclear Physics, vol. 70, no. 5, 055801, pp. 055801-1-055801-8. https://doi.org/10.1103/PhysRevC.70.055801

TY - JOUR

T1 - Energy dependence of the astrophysical S factor for the6Li(p, γ)7Be reaction

AU - Prior, R. M.

AU - Spraker, M. C.

AU - Amthor, A. M.

AU - Keeter, K. J.

AU - Nelson, S. O.

AU - Sabourov, A.

AU - Sabourov, K.

AU - Tonchev, A.

AU - Ahmed, M.

AU - Kelley, J. H.

AU - Tilley, D. R.

AU - Weller, H. R.

AU - Hofmann, H. M.

PY - 2004/11

Y1 - 2004/11

N2 - Polarized proton beams with energies from 80 to 130 keV have been used to determine the slope of the astrophysical S factor for the 6Li(p, γ,0)7Be and 6Li(p,γ1) 7Be reactions. The slope was determined from the relative yields at five incident proton energies. The slope of the S factor was found to be negative. The analyzing power measurements indicate that the reaction proceeds predominately by s-wave capture. The negative slope does not appear to be due to low-binding-energy effects, the effects of nearby resonances, or electron screening of the nuclei. A resonating group model calculation demonstrates a new mechanism for producing a negative slope at astrophysically relevant energies in radiative capture reactions.

AB - Polarized proton beams with energies from 80 to 130 keV have been used to determine the slope of the astrophysical S factor for the 6Li(p, γ,0)7Be and 6Li(p,γ1) 7Be reactions. The slope was determined from the relative yields at five incident proton energies. The slope of the S factor was found to be negative. The analyzing power measurements indicate that the reaction proceeds predominately by s-wave capture. The negative slope does not appear to be due to low-binding-energy effects, the effects of nearby resonances, or electron screening of the nuclei. A resonating group model calculation demonstrates a new mechanism for producing a negative slope at astrophysically relevant energies in radiative capture reactions.

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U2 - 10.1103/PhysRevC.70.055801

DO - 10.1103/PhysRevC.70.055801

M3 - Article

AN - SCOPUS:12344259464

SN - 0556-2813

VL - 70

SP - 055801-1-055801-8

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 5

M1 - 055801

ER -

Energy dependence of the astrophysical S factor for the⁶Li(p, γ)⁷Be reaction

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