Update of nuclear reaction rates affecting nucleosynthesis in novae

Coc, A.; Smirnova, N. A.; José, J.; Hernanz, M.; Thibaud, J.-P.

doi:10.1016/s0375-9474(01)00752-7

Cited by 48 publications

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“…However, the amount of 18 F produced and transported to the novae envelope is severely constrained by its destruction through 18 F(p, α) 15 O in the burning shells. Uncertainty in this reaction rate results in significant uncertainty in the amount of 18 F produced in these explosions that is predicted theoretically [1,2]. The proton-induced reactions on 18 F are also important for understanding the production of heavier elements, especially in the regions with higher temperatures and densities.…”

Section: Introductionmentioning

confidence: 97%

Astrophysically important 19Ne states studied with the 2H(18F, alpha+15O)n Reaction

Adekola¹,

Bardayan²,

Blackmon³

et al. 2009

Proceedings of 10th Symposium on Nuclei in the Cosmos — PoS(NIC X)

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Facility (HRIBF) of Oak Ridge National Laboratory (ORNL) by bombarding a 720-µg/cm 2 CD 2 target with a radioactive 18 F beam. The 19 Ne states of interest near the proton threshold decay by breakup into α and 15 O particles. These decay products were detected in coincidence with position-sensitive E−∆E silicon telescopes. The α and 15 N particles from the break up of the mirror nucleus 19 F were also measured with these detectors. Particle identification, coincidence, and Q-value requirements enable us to distinguish the reaction of interest from other reactions.

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Section: Introductionmentioning

confidence: 97%

Astrophysically important 19Ne states studied with the 2H(18F, alpha+15O)n Reaction

Adekola¹,

Bardayan²,

Blackmon³

et al. 2009

Proceedings of 10th Symposium on Nuclei in the Cosmos — PoS(NIC X)

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“…The 511 keV line might be one of the main observable features. Specifically, positrons emitted by 18 F may have the special feature to be emitted (and then quickly annihilated) at the moment (around 110 minutes, half-life of 18 F) when the novae envelope starts to be transparent to the γ-radiation [1][2][3]. 18 F appears to be produced in the novae inner shells via the Hot-CNO cycle according to several authors [2].…”

Section: Introductionmentioning

confidence: 99%

Fusion reactions induced by radioactive beams: the¹⁸F(p,α)¹⁵O case

et al. 2017

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Abstract. Gamma ray astronomy has made big strides in the last decades paving the way to a better understanding of explosive nucleosynthesis. In particular, crucial information on novae nucleosynthesis is linked to the abundance of the 18 F isotope, which might be detected in explosive environments. Therefore, the reaction network producing and destroying this radioactive isotope has been extensively studied in the last years. Among those reactions, the 18 F(p,α) 15 O cross section has been measured by means of several dedicated experiments, both using direct and indirect methods. The presence of resonances in the energy region of astrophysical interest has been reported by many authors. In the present work a report on a recent experiment performed via the Trojan Horse Method (THM) at the Texas A&M Cyclotron Institute is presented and the results are given and compared with the ones known in the literature, both direct and indirect. Data arising from THM measurements are then averaged and the reaction rate calculated in the novae energy range. Hints on future astrophysical applications will also be given.

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“…In the rest of this paper the results obtained for the 18 F(p,α) 15 O reaction will be shortly reported as an example of the application of the THM to RIB induced reactions and another part will be devoted to the presentation of an experiment just performed at INFN-Laboratori Nazionali del Sud to apply the TY criterion to a nuclear reaction using a modern experimental setup.…”

Section: Introductionmentioning

confidence: 99%

“…The knowledge of the 18 F(p, α) 15 O reaction rate is crucial to understand the nova explosion phenomena [18]. The cross section of this reaction is characterized by the presence of several resonances in 19 Ne and possibly interference effects among them.…”

Section: Introductionmentioning

confidence: 99%

Recent Results of Direct Nuclear Reaction Experiments for Stellar Nucleosynthesis

Cherubini¹

2017

Proceedings of the 14th International Symposium on Nuclei in the Cosmos (NIC2016)

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Nuclear cross sections between charged particles at stellar energies are among the faintest to be measured in nuclear physics. In order to overcome the experimental problems connected to these measurements, indirect methods where proposed and used in many experiments over the last decades. One of these, the Trojan Horse method, is based on the Quasi-Free reaction mechanism and proved to be particularly flexible and reliable and it allowed for the measurement of the cross sections of various reactions of astrophysical interest. The use and reliability of indirect methods become even more important when reactions induced by Radioactive Ion Beams are considered. As an example we will report here on the first measurement of 18 F(p,α) 15 O process in Nova conditions by applying the Trojan Horse method to the 18 F(d,α 15 O)n reaction. In order to establish the reliability of such an approach, the Treiman-Yang criterion is an important test and it will also be addressed in this paper.

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Update of nuclear reaction rates affecting nucleosynthesis in novae

Cited by 48 publications

References 0 publications

Astrophysically important 19Ne states studied with the 2H(18F, alpha+15O)n Reaction

Astrophysically important 19Ne states studied with the 2H(18F, alpha+15O)n Reaction

Fusion reactions induced by radioactive beams: the¹⁸F(p,α)¹⁵O case

Recent Results of Direct Nuclear Reaction Experiments for Stellar Nucleosynthesis

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Update of nuclear reaction rates affecting nucleosynthesis in novae

Cited by 48 publications

References 0 publications

Astrophysically important 19Ne states studied with the 2H(18F, alpha+15O)n Reaction

Astrophysically important 19Ne states studied with the 2H(18F, alpha+15O)n Reaction

Fusion reactions induced by radioactive beams: the18F(p,α)15O case

Recent Results of Direct Nuclear Reaction Experiments for Stellar Nucleosynthesis

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Fusion reactions induced by radioactive beams: the¹⁸F(p,α)¹⁵O case