Abstract.
The 12C(12C,p)23Na and 12C(12C,\(\alpha\))20Ne fusion reactions are among the most important in stellar evolution since they determine the destiny of massive (\( M \simeq 8-10 M_{\odot}\)) stars. However, experimental low-energy investigations of such reactions are significantly hampered by ubiquitous natural hydrogen and deuterium contaminants in the carbon targets. The associated beam-induced background completely masks the reaction products of interest thus preventing cross-section measurements at the relevant energies of astrophysical interest, \(E_{\mathrm{cm}} < 2\) MeV. In this work, we report about an investigation aimed at assessing possible deuterium reductions on both natural graphite and Highly Ordered Pyrolytic Graphite targets as a function of target temperature. Our results indicate that reductions up to about 80% can be attained on both targets in the temperature range investigated, \( T \simeq 200-1200 {}^{\circ}\)C. A further reduction by a factor of 2.5 in absolute deuterium content is observed when the scattering chamber is surrounded by a dry nitrogen atmosphere so as to minimise light-particles uptake within the chamber rest gas (and thus on target) through air leaks. The results from this study will inform the choice of optimal experimental conditions and procedures for improved measurements of the 12C + 12C reactions cross-sections at the low energies of astrophysical interest.
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References
A. Chieffi et al., Astrophys. J. 502, 737 (1998)
El Eid et al., Astrophys. J. 611, 452 (2004)
J. Patterson, H. Winkler, C. Zaidins, Astrophys. J. 157, 367 (1969)
M. Mazarakis, W. Stephens, Phys. Rev. C 7, 4 (1973)
H.W. Becker, K.U. Kettner, C. Rolfs, H.-P. Trautvetter, Z. Phys. A 312, 305 (1981)
M. High, B. Ĉujec, Nucl. Phys. A 282, 181 (1977)
K.U. Kettner et al., Z. Phys. A 75, 65 (1980)
P. Rosales, E. Aguilera, Rev. Mexi. Fís. 49, 88 (2003)
L. Barrón-Palos, E. Chavez, Rev. Mexi. Fís. 50, 18 (2004)
L. Barrón-Palos et al., Eur. Phys. J. A 25, 645 (2005)
L. Barrón-Palos et al., Nucl. Phys. A 779, 318 (2006)
E. Aguilera et al., Phys. Rev. C 73, 064601 (2006)
T. Spillane et al., Phys. Rev. Lett. 98, 122501 (2007)
C.L. Jiang et al., Nucl. Instrum. Methods Phys. Res. A 682, 12 (2012)
C.L. Jiang et al., Phys. Rev. C 97, 012801 (2018)
M. Wiescher, Annu. Rev. Astron. Astrophys. 50, 165 (2012)
X.D. Tang et al., Nucl. Phys. Astrophys. V 337, 012016 (2012)
A. Zaloznik et al., Nucl. Instrum. Methods Phys. Res. B 371, 167 (2016)
F. Terrasi et al., Nucl. Instrum. Methods B 259, 14 (2007)
M. Romoli, Eur. Phys. J. A (2018) https://doi.org/10.1140/epja/i2018-12575-5
http://www.canberra.com (last accessed: July 4, 2018)
L. Morales-Gallegos, Carbon burning in stars: An experimental study of the ${}^{12}C(^{12}C,p)^{23}Na$ reaction towards astrophysical energies, PhD Thesis, The University of Edinburgh (2017).
J. Zickefoose, ${}^{12}C + {}^{12}C$ fusion: Measurement and advances toward the Gamow energy, PhD Thesis, University of Connecticut, US (2010)
L. Zhang, Simulations of deuterium contamination for ${}^{12}C + {}^{12}C$ reaction studies, internal report, The University of Edinburgh (2017)
P.R. Bevington, Data Reduction and Error Analysis for the Physical Sciences (McGraw-Hill, 2003)
M. Kokkoris et al., Nucl. Instrum. Methods Phys. Res. B 249, 77 (2006)
P. Reichart et al., Nucl. Instrum. Methods Phys. Res. B 249, 286 (2006)
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Morales-Gallegos, L., Aliotta, M., Bruno, C.G. et al. Reduction of deuterium content in carbon targets for 12C + 12C reaction studies of astrophysical interest. Eur. Phys. J. A 54, 132 (2018). https://doi.org/10.1140/epja/i2018-12564-8
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DOI: https://doi.org/10.1140/epja/i2018-12564-8