J/A+A/541/A158 7Li(p,α)4He reaction rate (Lamia+, 2012)
Recent evaluation of the 7Li(p,α)4He reaction rate at astrophysical
energies via the Trojan Horse method.
Lamia L., Spitaleri C., La Cognata M., Palmerini S., Pizzone R.G.
<Astron. Astrophys. 541, A158 (2012)>
=2012A&A...541A.158L 2012A&A...541A.158L
ADC_Keywords: Atomic physics
Keywords: nuclear reactions, nucleosynthesis, abundances - stars: abundances -
stars: interiors
Abstract:
The charged-particle induced reactions on lithium have been studied by
several works. In particular, several direct measurements of the
7Li(p,α)4He reaction have been performed to extrapolate its
low-energy astrophysical S(E)-factor and evaluate the electron
screening potential, Ue.
In view of recent direct measurements, we discuss our estimate of the
bare-nucleus S(E)-factor and an evaluation of the corresponding
reaction rate. Moreover, we present the extracted electron screening
potential.
Description:
The Trojan Horse method (THM) allows us to measure the
7Li(p,α)4He bare-nucleus S(E)-factor down to energies of
∼10keV, rendering unnecessary the extrapolation procedure typically
used by the direct measurements. The 7Li(p,α)4He S(E)-factor
is deduced from the 2H(7Li,α4He)n reaction by selecting
the quasi-free contribution to the reaction yield. The plane-wave
impulse approximation has proved an effective approach as distortions
appear negligible.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 61 60 Adopted and the evaluated Torjan Horse (TH)
7Li(p,α)4He reaction rate
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.3 GK T9 Temperature (in 109K)
8- 15 E8.3 --- b_Rate Lower value for TH
7Li(p,α)4He reaction rate
17- 24 E8.3 --- Rate Adopted value for TH
7Li(p,α)4He reaction rate
26- 33 E8.3 --- B_Rate Upper value for TH
7Li(p,α)4He reaction rate
35- 42 E8.3 --- Rate.fit Fitted value for TH
7Li(p,α)4He reaction rate
44- 51 E8.3 --- Rate.N99 Nacre (Angulo et al. 1999, Nucl. Phys. A,
656, 3) value for
7Li(p,α)4He reaction rate
53- 56 F4.2 --- Adopt/N99 Ratio Adopted-to-Nacre values
58- 61 F4.2 --- Adopt/fit Ratio Adopted-to-Fit values
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Apr-2012