dorsal/arxiv
View SchemaIndirect techniques in nuclear astrophysics. Asymptotic Normalization Coefficient and Trojan Horse
| Authors | A. M. Mukhamedzhanov, L. D. Blokhintsev, B. A. Brown, V. Burjan, S. Cherubini, C. A. Gagliardi, B. F. Irgaziev, V. Kroha, F. M. Nunes, F. Pirlepesov, R. G. Pizzone, S. Romano, C. Spitaleri, X. D. Tang, L. Trache, R. E. Tribble, A. Tumino |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0509035 |
| URL | https://arxiv.org/abs/nucl-th/0509035 |
| DOI | 10.1016/j.nuclphysa.2006.12.051 |
| Journal | Nucl.Phys.A787:321-328,2007 |
Abstract
Owing to the presence of the Coulomb barrier at astrophysically relevant kinetic energies it is very difficult, or sometimes impossible, to measure astrophysical reaction rates in the laboratory. That is why different indirect techniques are being used along with direct measurements. Here we address two important indirect techniques, the asymptotic normalization coefficient (ANC) and the Trojan Horse (TH) methods. We discuss the application of the ANC technique for calculation of the astrophysical processes in the presence of subthreshold bound states, in particular, two different mechanisms are discussed: direct capture to the subthreshold state and capture to the low-lying bound states through the subthreshold state, which plays the role of the subthreshold resonance. The ANC technique can also be used to determine the interference sign of the resonant and nonresonant (direct) terms of the reaction amplitude. The TH method is unique indirect technique allowing one to measure astrophysical rearrangement reactions down to astrophysically relevant energies. We explain why there is no Coulomb barrier in the sub-process amplitudes extracted from the TH reaction. The expressions for the TH amplitude for direct and resonant cases are presented.
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"abstract": "Owing to the presence of the Coulomb barrier at astrophysically relevant\nkinetic energies it is very difficult, or sometimes impossible, to measure\nastrophysical reaction rates in the laboratory. That is why different indirect\ntechniques are being used along with direct measurements. Here we address two\nimportant indirect techniques, the asymptotic normalization coefficient (ANC)\nand the Trojan Horse (TH) methods. We discuss the application of the ANC\ntechnique for calculation of the astrophysical processes in the presence of\nsubthreshold bound states, in particular, two different mechanisms are\ndiscussed: direct capture to the subthreshold state and capture to the\nlow-lying bound states through the subthreshold state, which plays the role of\nthe subthreshold resonance. The ANC technique can also be used to determine the\ninterference sign of the resonant and nonresonant (direct) terms of the\nreaction amplitude. The TH method is unique indirect technique allowing one to\nmeasure astrophysical rearrangement reactions down to astrophysically relevant\nenergies. We explain why there is no Coulomb barrier in the sub-process\namplitudes extracted from the TH reaction. The expressions for the TH amplitude\nfor direct and resonant cases are presented.",
"arxiv_id": "nucl-th/0509035",
"authors": [
"A. M. Mukhamedzhanov",
"L. D. Blokhintsev",
"B. A. Brown",
"V. Burjan",
"S. Cherubini",
"C. A. Gagliardi",
"B. F. Irgaziev",
"V. Kroha",
"F. M. Nunes",
"F. Pirlepesov",
"R. G. Pizzone",
"S. Romano",
"C. Spitaleri",
"X. D. Tang",
"L. Trache",
"R. E. Tribble",
"A. Tumino"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/j.nuclphysa.2006.12.051",
"journal_ref": "Nucl.Phys.A787:321-328,2007",
"title": "Indirect techniques in nuclear astrophysics. Asymptotic Normalization Coefficient and Trojan Horse",
"url": "https://arxiv.org/abs/nucl-th/0509035"
},
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