Particle decays in 28Si: The destruction of 27Al in red giants and novae

doi:10.1016/0375-9474(88)90622-7

Nuclear Physics A

Volume 487, Issue 2, 10 October 1988, Pages 433-441

https://doi.org/10.1016/0375-9474(88)90622-7 Get rights and content

Abstract

The ²⁷Al(³He, d)²⁸Si reaction has been used to populate states near the ²⁷Al+p threshold and the ensuing proton and alpha decay has been measured. No evidence for new $^{27} Al(p, α)^{24} Mg$ resonance strength was observed and consequently revised limits have been placed on the thermonuclear reaction rate. As a result, the $^{27} Al(p, α)^{24} Mg$ reaction is found to be astrophysically unimportant at red-giant and nova temperatures.

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Exploring the astrophysical energy range of the 27Al(p,α)24Mg reaction: A new recommended reaction rate
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The ²⁶Al abundance holds a special role in present-day astrophysics, since it is a probe of active nucleosynthesis in the Galaxy and a valuable constraint of Galactic core-collapse supernovae rate. It is estimated through the detection of the 1809-keV γ-line of the daughter ²⁶Mg and from the superabundance of ²⁶Mg in comparison with the most abundant ²⁴Mg isotope in meteorites. Accurate knowledge of the reaction rates involving ²⁶Al, its stable counterpart ²⁷Al and ²⁴Mg is then mandatory. Moreover, these nuclei enter the MgAl cycle playing an important role in the production of Al and Mg isotopes. Recently, high-resolution stellar surveys have shown that the Mg-Al anti-correlation in red giants of globular clusters may hide the existence of multiple stellar populations, and that the relative abundances of Mg isotopes may not show correlation with Al.
The common thread running through these astrophysical scenarios is the ²⁷Al(p,α)²⁴Mg reaction, which is the main ²⁷Al destruction channel and directly correlates its abundance with the ²⁴Mg one. Since available reaction rates show an order of magnitude uncertainty owing to the vanishingly small cross section at astrophysical energies, we have applied the Trojan Horse Method to deduce the reaction rate with no need of extrapolation. The indirect measurement made it possible to assess the contribution of the 84-keV resonance and to lower the upper limits on the strength of nearby resonances, with potential important impact for astrophysics. In particular, modifications in the ²⁷Al and ²⁴Mg abundances up to $\sim 30 %$ are predicted for intermediate mass stars.
Nuclear data sheets for A = 28
2013, Nuclear Data Sheets
Charged-particle thermonuclear reaction rates: III. Nuclear physics input
2010, Nuclear Physics A
The nuclear physics input used to compute the Monte Carlo reaction rates and probability density functions that are tabulated in the second paper of this issue (Paper II) is presented. Specifically, we publish the input files to the Monte Carlo reaction rate code RatesMC, which is based on the formalism presented in the first paper of this issue (Paper I). This data base contains overwhelmingly experimental nuclear physics information. The survey of literature for this review was concluded in November 2009.
A compilation of charged-particle induced thermonuclear reaction rates
1999, Nuclear Physics A
Low-energy cross section data for 86 charged-particle induced reactions involving light (1 ⩽ Z ⩽ 14), mostly stable, nuclei are compiled. The corresponding Maxwellian-averaged thermonuclear reaction rates of relevance in astrophysical plasmas at temperatures in the range from 10⁶ K to 10¹⁰ K are calculated. These evaluations assume either that the target nuclei are in their ground state, or that the target states are thermally populated following a Maxwell-Boltzmann distribution, except in some cases involving isomeric states.
Adopted values complemented with lower and upper limits of the rates are presented in tabular form. Analytical approximations to the adopted rates, as well as to the inverse/direct rate ratios, are provided.
Explosive hydrogen burning of 35Cl
1994, Nuclear Physics, Section A
Proton threshold states in ³⁶Ar have been studied via the reactions ³⁵Cl(³He, d)³⁶Ar, ³²S(⁶Li, d)³⁶Ar, ³²S(α, γ)³⁶Ar, ³⁵Cl(p, γ)³⁶Ar and ³⁵Cl(p, α)³²S to investigate their influence on a possible SC1 reaction cycle in explosive hydrogen burning. Three new states in ³⁶Ar have been observed in the (³He, d) reaction at E_x = 8806, 8887 and 8923 keV. Deuteron angular distributions were measured for 14 states near the ³⁵Cl+p threshold and were analyzed with DWBA calculations. Values of transferred orbital angular momenta, spectroscopic factors and proton partial widths were determined. Gamma-ray spectra have been measured at ten (p, γ) resonances. Three new resonances were observed at E_R = 311, 416 and 627 keV, corresponding to ³⁶Ar states at E_x = 8806, 8909 and 9117 keV, respectively. Excitation and resonance energies, γ-ray branching ratios and resonance strengths are presented. The astrophysical implications of our results for explosive hydrogen burning of ³⁵Cl are discussed.
The 26Al(p, γ)27Si reaction at low stellar temperature
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Shell-model calculations have been used to predict the locations of states in ²⁷Si which are analogous to well-studied states in ²⁷Al. From this, we have determined the resonance properties of the known states in ²⁷Si near the ²⁶Al + p threshold. The resulting thermonuclear reaction rate is uncertain by about a factor of ten at low temperatures, but it appears that the ²⁶Al(p, γ)²⁷Si reaction is too slow to destroy a significant amount of ²⁶Al at these temperatures.

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^☆: Work supported in part by the National Science Foundation and in part by the US Department of Energy.

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Nuclear Physics A

Abstract

References (14)

Phys. Reports

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

At. Data Nucl. Data Tables

Nucl. Phys.

Cited by (35)

Exploring the astrophysical energy range of the <sup>27</sup>Al(p,α)<sup>24</sup>Mg reaction: A new recommended reaction rate

Nuclear data sheets for A = 28

Charged-particle thermonuclear reaction rates: III. Nuclear physics input

A compilation of charged-particle induced thermonuclear reaction rates

Explosive hydrogen burning of <sup>35</sup>Cl

The <sup>26</sup>Al(p, γ)<sup>27</sup>Si reaction at low stellar temperature

Particle decays in 28Si: The destruction of 27Al in red giants and novae☆

Abstract

Phys. Reports

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

At. Data Nucl. Data Tables

Nucl. Phys.

Particle decays in ²⁸Si: The destruction of ²⁷Al in red giants and novae☆