D. Trezzi

Low-energy resonances in the O 18 ( p , γ ) 19 F reaction

A. Boeltzig, Andreas Best, Roberto Perrino, Marialuisa Aliotta et autres

Background: Shell hydrogen burning during the asymptotic giant branch (AGB) phase through the oxygen isotopes has been indicated as a key process that is needed to understand the observed $^{18}\mathrm{O}/^{16}\mathrm{O}$ relative abundance in presolar grains and in stellar atmospheres. This ratio is …

it, gb, de, hu, us (code pays fourni par la source)

The baryon density of the Universe from an improved rate of deuterium burning

Viviana Mossa, Klaus Stöckel, F. Cavanna, F. Ferraro et autres

it, de, gb, hu (code pays fourni par la source)

Cross section of the reaction 18O(p,γ)19F at astrophysical energies: The 90 keV resonance and the direct capture component

Andreas Best, A. Boeltzig, G. Imbriani, Marialuisa Aliotta et autres

The observation of oxygen isotopes in giant stars sheds light on mixing processes operating in their interiors. Due to the very strong correlation between nuclear burning and mixing processes it is very important to reduce the uncertainty on the cross sections of …

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Direct measurements of low-energy resonance strengths of the 23Na(p,γ)24Mg reaction for astrophysics

A. Boeltzig, Andreas Best, G. Imbriani, M. Junker et autres

The NeNa and the MgAl cycles play a fundamental role in the nucleosynthesis of asymptotic giant branch stars undergoing hot bottom burning. The Na23(p,γ)24Mg reaction links these two cycles and a precise determination of its rate is required to correctly estimate the …

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Improved astrophysical rate for the 18O(p,α)15N reaction by underground measurements

Carlo Giulio Bruno, Marialuisa Aliotta, P. Descouvemont, Andreas Best et autres

The 18O(p,α)15N reaction affects the synthesis of 15N, 18O and 19F isotopes, whose abundances can be used to probe the nucleosynthesis and mixing processes occurring deep inside asymptotic giant branch (AGB) stars. We performed a low-background direct measurement of the 18O(p,α)15N reaction …

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Direct Capture Cross Section and the Ep=71 and 105 keV Resonances in the Ne22(p,γ)Na23 Reaction

F. Ferraro, Marcell Péter Takács, D. Piatti, F. Cavanna et autres

The $^{22}\mathrm{Ne}(p,\ensuremath{\gamma})^{23}\mathrm{Na}$ reaction, part of the neon-sodium cycle of hydrogen burning, may explain the observed anticorrelation between sodium and oxygen abundances in globular cluster stars. Its rate is controlled by a number of low-energy resonances and a slowly varying nonresonant component. Three …

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Erratum: Three New Low-Energy Resonances in the Ne22(p,γ)Na23 Reaction [Phys. Rev. Lett. 115 , 252501 (2015)]

F. Cavanna, R. Depalo, Marialuisa Aliotta, Michael Anders et autres

This corrects the article DOI: 10.1103/PhysRevLett.115.252501.

Study of the2H(p,γ)3He reaction in the BBN energy range at LUNA

D. Trezzi

Using Big Bang Nucleosynthesis with the recent cosmological parameters obtained by the Planck collaboration, a primordial deuterium abundance value D/H = (2.65 ± 0.07) × 10 −5 is obtained. This one is a little bit in tension with astronomical observations on metal- …

it (code pays fourni par la source)

Improved background suppression for radiative capture reactions at LUNA with HPGe and BGO detectors

A. Boeltzig, Andreas Best, G. Imbriani, M. Junker et autres

Abstract Direct measurements of small nuclear reaction cross sections require a low background in the signal region of interest to achieve the necessary sensitivity. We describe two complementary detector setups that have been used for studies of ( p , γ ) …

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LUNA: Status and prospects

Carlo Broggini, D. Bemmerer, A. Caciolli, D. Trezzi

it, de (code pays fourni par la source)

Origin of meteoritic stardust unveiled by a revised proton-capture rate of $^{17}$O

Maria A. Lugaro, Amanda I. Karakas, Carlo Giulio Bruno, Marialuisa Aliotta et autres

Stardust grains recovered from meteorites provide high-precision snapshots of the isotopic composition of the stellar environment in which they formed. Attributing their origin to specific types of stars, however, often proves difficult. Intermediate-mass stars of 4-8 solar masses are expected to contribute …

Origin of meteoritic stardust unveiled by a revised proton-capture rate of 17O

Maria A. Lugaro, Amanda I. Karakas, Carlo Giulio Bruno, Marialuisa Aliotta et autres

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