Breakup of loosely bound nuclei as indirect method in nuclear astrophysics: 8B, 9C, 23Al

Abstract

We discuss the use of one-nucleon breakup reactions of loosely bound nuclei at intermediate energies as an indirect method in nuclear astrophysics. These are peripheral processes, therefore we can extract asymptotic normalization coefficients (ANC) from which reaction rates of astrophysical interest can be inferred. To show the usefulness of the method, three different cases are discussed. In the first, existing experimental data for the breakup of 8B at energies from 30 to 1000 MeV/u and of 9C at 285 MeV/u on light through heavy targets are analyzed. Glauber model calculations in the eikonal approximation and in the optical limit using different effective interactions give consistent, though slightly different results, showing the limits of the precision of the method. The results lead to the astrophysical factor S_17(0)=18.7+/-1.9 eVb for the key reaction for solar neutrino production 7Be(p,γ)8B. It is consistent with the values from other indirect methods and most direct measurements, but one. Breakup reactions can be measured with radioactive beams as weak as a few particles per second, and therefore can be used for cases where no direct measurements or other indirect methods for nuclear astrophysics can be applied. We discuss a proposed use of the breakup of the proton drip line nucleus 23Al to obtain spectroscopic information and the stellar reaction rate for 22Mg(p,γ)23Al.

6 pages, 4 figures. Presented at the conference "Nuclear Physics for Astrophysics 2", Debrecen, Hungary, May 2005. Prepared for the Proceedings

References in corpus (9)

• Precise measurement of the ^7Be(p,gamma)^8B S-factor
• Coulomb dissociation of 8B and the low-energy cross section of the 7Be(p,gamma)8B solar fusion reaction
• Asymptotic normalization coefficient of ^{8}B from breakup reactions and the S_{17} astrophysical factor
• Relativistic continuum-continuum coupling in the dissociation of halo nuclei
• Electromagnetic dissociation of 8B and the astrophysical S factor for 7Be(p,gamma)8B
• Scattering of ${}^7$Be and ${}^8$B and the astrophysical S${}_{17}$ factor
• Determination of the S_18 astrophysical factor for 8B(p,gamma)9C from the breakup of 9C at intermediate energies
• Breakup of 8B and the S17 astrophysical factor revisited
• Determination of S17(0) from published data

Cited by in corpus (1)

• Structure of 23Al from one-proton breakup reaction and astrophysical implications