Abstract
In stars, four hydrogen nuclei are converted into a helium nucleus in two competing nuclear fusion processes, namely the proton-proton chain (p-p chain)and the carbon-nitrogen-oxygen (CNO) cycle. For temperatures above 20 million kelvin, the CNO cycle dominates energy production, and its rate is determined by the slowest process, the 14N(p, γ)15O radiative capture reaction. This reaction proceeds through direct and resonant capture into the ground state and several excited states in 15O. High energy data for capture into each of these states can be extrapolated to stellar energies using an R-matrix fit. The results from several recent extrapolation studies are discussed. A new experiment at the LUNA (Laboratory for Underground Nuclear Astrophysics) 400 kV accelerator in Italy’s Gran Sasso laboratory measures the total cross section of the 14N(p, γ)15O reaction with a windowless gas target and a 4π BGO summing detector, down to center of mass energies as low as 70 keV. After reviewing the characteristics of the LUNA facility, the main features of this experiment are discussed, as well as astrophysical scenarios where cross section data in the energy range covered have a direct impact, without any extrapolation.
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References
C. Rolfs, W. Rodney, Cauldrons in the Cosmos (University of Chicago Press, Chicago, 1988).
H. Bethe, Phys. Rev. 55, 434 (1938).
J.N. Bahcall, M.H. Pinsonneault, Phys. Rev. Lett. 92, 121301 (2004).
C. Angulo et al., Nucl. Phys. A 656, 3 (1999).
M. Wiescher, J. Görres, H. Schatz, J. Phys. G 25, R133 (1999).
D. Bemmerer, Experimental study of the 14N(p, γ)15O reaction at energies far below the Coulomb barrier, PhDThesis, Technische Universität Berlin (2004).
A. Lemut, Misura della sezione d’urto della reazione 14N(p, γ)15O ad energie di interesse astrofisico, PhD Thesis, Università degli Studi di Genova (2005).
L. Siess, M. Livio, J. Lattanzio, Astrophys. J. 570, 329 (2002).
F. Herwig, S. M. Austin, Astrophys. J. 613, L73 (2004).
J. José, M. Hernanz, Astrophys. J. 494, 680 (1998).
J.N. Bahcall, A.M. Serenelli, S. Basu, Astrophys. J. 621, L85 (2005).
L. Krauss, B. Chaboyer, Science 299, 65 (2003).
G. Imbriani et al., Astron. Astrophys. 420, 625 (2004).
E. Degl’Innocenti et al., Phys. Lett. B 590, 13 (2004).
D.B. Duncan, J.E. Perry, Phys. Rev. 82, 809 (1951).
W. Lamb, R. Hester, Phys. Rev. 108, 1304 (1957).
R.E. Pixley, The reaction cross section of nitrogen 14 for protons between 220 keV and 600 keV, PhD Thesis, California Institute of Technology (1957).
B. Povh, D.F. Hebbard, Phys. Rev. 115, 608 (1959).
D.F. Hebbard, G.M. Bailey, Nucl. Phys. 49, 666 (1963).
U. Schröder et al., Nucl. Phys. A 467, 240 (1987).
F. Ajzenberg-Selove, Nucl. Phys. A 523, 1 (1991).
A. Formicola et al., Phys. Lett. B 591, 61 (2004).
E. Adelberger et al., Rev. Mod. Phys. 70, 1265 (1998).
C. Angulo, P. Descouvemont, Nucl. Phys. A 690, 755 (2001).
P. Bertone et al., Phys. Rev. Lett. 87, 152501 (2003).
P.F. Bertone et al., Phys. Rev. C 66, 055804 (2002).
A. Mukhamedzhanov et al., Phys. Rev. C 67, 065804 (2003).
K. Yamada et al., Phys. Lett. B 579, 265 (2004).
R.C. Runkle et al., Phys. Rev. Lett. 94, 082503 (2005).
A.M. Mukhamedzhanov, C.A. Gagliardi, R.E. Tribble, Phys. Rev. C 63, 024612 (2001).
S.O. Nelson et al., Phys. Rev. C 68, 065804 (2003).
S.P. Ahlen et al., Phys. Lett. B 249, 149 (1990).
H. Wulandari et al., (2004), hep-ex/0401032.
H. Wulandari, J. Jochum, W. Rau, F. von Feilitzsch, Astropart. Phys. 22, 313 (2004).
P. Belli et al., Nuovo Cimento A 101, 959 (1989).
D. Bemmerer et al., Eur. Phys. J. A 24, 313 (2005).
G. Müller et al., Nucl. Instrum. Methods A 295, 133 (1990).
U. Greife et al., Nucl. Instrum. Methods A 350, 327 (1994).
M. Junker et al., Phys. Rev. C 57, 2700 (1998).
R. Bonetti et al., Phys. Rev. Lett. 82, 5205 (1999).
C. Casella et al., Nucl. Instrum. Methods A 489, 160 (2002).
C. Casella et al., Nucl. Phys. A 706, 203 (2002).
A. Formicola et al., Nucl. Instrum. Methods A 507, 609 (2003).
A. Formicola et al., Nucl. Phys. A 719, 94c (2003).
A. Formicola, A new study of 14N(p, γ)15O at low energy, PhD Thesis, Ruhr-Universität Bochum (2004).
LUNA Collaboration, LNGS Annual Report, 159 (2003).
F. Confortola, Studio della reazione 14N(p, γ)15O ad energie di interesse astrofisico, Master’s Thesis, Università degli Studi di Genova (2003).
J. Görres et al., Nucl. Instrum. Methods 177, 295 (1980).
J. Ziegler, SRIM version 2003.26, http://www.srim.org (2004).
H. Costantini, Direct measurements of radiative capture reactions at astrophysical energies, PhD Thesis, Università degli Studi di Genova (2003).
I. Iben, A. Renzini, Annu. Rev. Astron. Astrophys. 21, 271 (1983).
H. Fynbo et al., Nature 433, 136 (2005).
I. Iben, Astrophys. J. 246, 278 (1981).
A. Weiss, A. Serenelli, A. Kitsikis, H. Schlattl, J. Christensen-Dalsgaard, astro-ph/0503408 (2005).
A. Weiss, S. Cassisi, H. Schlattl, M. Salaris, Astrophys. J. 533, 413 (2000).
C. Iliadis, A. Champagne, J. José, S. Starrfield, P. Tupper, Astrophys. J. Suppl. Ser. 142, 105 (2002).
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Bemmerer, D. et al. (2006). CNO hydrogen burning studied deep underground. In: Fülöp, Z., Gyürky, G., Somorjai, E. (eds) The 2nd International Conference on Nuclear Physics in Astrophysics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-32843-2_24
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