Cross Sections for the 25Mg(α,n)28Si Reaction for Eα &lt; 4.8 MeV

Zwan, L. van der; Geiger, Klaus

doi:10.13182/nse81-a27408

Cited by 16 publications

(33 citation statements)

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“…At this temperature, the Gamow window of the 25 Mg(α, n) 28 Si reaction extends from 1 to 4 MeV. In the energy range E α = 1 -6 MeV, the 25 Mg(α,n) 28 Si cross section has been reported by many authors ( [7] - [11]). A summary of the currently available experimental cross sections is reported in fig.…”

Section: Introductionmentioning

confidence: 83%

Measurement of the²⁵Mg(α,n)²⁸Si reaction cross section at LNL

Depalo

Caciolli

Marchi

et al. 2014

EPJ Web of Conferences

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Abstract. The detection of the 1809 keV emission line associated with the decay of 26 Al in the interstellar medium provides a direct evidence of recent nucleosynthesis events in our galaxy. 26 Al is thought to be mainly produced in massive stars, but in order to have a quantitative understanding of the 26 Al distribution, the cross section of all the nuclear reactions involved in its production should be accurately known. A recent sensitivity study demonstrated that the 25 Mg(α,n) 28 Si is the reaction with the strongest impact on the synthesis of 26 Al during explosive Neon and Carbon burning [4]. In order to improve the experimental knowledge of the 25 Mg(α,n) 28 Si cross section, a new direct measurement has been performed at Legnaro National Laboratories. The experimental setup, the data analysis and preliminary results are discussed.

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Section: Introductionmentioning

confidence: 83%

Measurement of the²⁵Mg(α,n)²⁸Si reaction cross section at LNL

Depalo

Caciolli

Marchi

et al. 2014

EPJ Web of Conferences

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“…The 25 Mg(α,n) 28 Si (Q = 2.654 MeV) has been measured in 1981 by Van Der Zwan and Geiger [21] and then by Anderson and coworkers in 1983 [22]. In the former work, neutron spectroscopy was performed using 4 Stilbene scintillators placed at 0…”

Section: Existing Measurementsmentioning

confidence: 99%

“…The measured differential cross section was fitted with Legendre polynomials from P 0 to P 2 for emitted neutrons corresponding to the population of ground and 1st excited states of 28 Si. For the population of higher excited states (2nd and 3rd) an isotropic distribution was assumed in [21] (see in fig. 3 the 28 Si level scheme).…”

Section: Existing Measurementsmentioning

confidence: 99%

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A new study of 25Mg $(\alpha, n)$ 28Si angular distributions at $E_{\alpha} =3-5$ MeV

et al. 2014

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Abstract. The observation of26 Al gives us the proof of active nucleosynthesis in the Milky Way. However the identification of the main producers of 26 Al is still a matter of debate. Many sites have been proposed, but our poor knowledge of the nuclear processes involved introduces high uncertainties. In particular, the limited accuracy on the 25 Mg(α,n) 28 Si reaction cross section has been identified as the main source of nuclear uncertainty in the production of 26 Al in C/Ne explosive burning in massive stars, which has been suggested to be the main source of 26 Al in the Galaxy. We studied this reaction through neutron spectroscopy at the CN Van de Graaff accelerator of the Legnaro National Laboratories. Thanks to this technique we are able to discriminate the (α,n) events from possible contamination arising from parasitic reactions. In particular, we measured the neutron angular distributions at 5 different beam energies (between 3 and 5 MeV) in the 17.5• -106• laboratory system angular range. The presented results disagree with the assumptions introduced in the analysis of a previous experiment. PACS

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“…The 25 Mg(α,n) 28 Si cross section has been already measured in the energy range from E Lab α = 1 to 6 MeV ( [5] - [9]). All measurements are characterised by large uncertainties due to the contribution of background reactions on light nuclei, present as contaminants in the setup (mainly 13 C(α,n) 16 O, 18 O(α,n) 21 Ne, and 19 F(α,n) 22 Na).…”

Section: Introductionmentioning

confidence: 99%

The 25Mg (a,n)28Si reaction studied at LNL

Caciolli¹

2014

Proceedings of XV International Workshop on Neutrino Telescopes — PoS(Neutel 2013)

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The observation of 26 Al in the Milky Way is a clear hint of recent nucleosynthesis (τ ∼1 My). The 26 Al distribution is a robust parameter to control the predictions of stellar evolution models. A recent sensitivity study demonstrated that the 25 Mg(α,n) 28 Si is the reaction with the strongest impact on 26 Al during explosive neon and carbon burning. Its cross section was measured by several experiments reporting discrepancy of more than a factor of 3. In order to improve the experimental knowledge of the 25 Mg(α,n) 28 Si cross section, a new direct measurement has been performed at Laboratori Nazionali di Legnaro. Neutron spectroscopy is provided by the time of flight technique and pulsed beam. γ-n discrimination is achieved applying the Pulse Shape Analysis technique. Preliminary results of differential cross section in a range of angle from 17 up to 106 degrees will be presented.

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Cross Sections for the ²⁵Mg(α,n)²⁸Si Reaction for E_α < 4.8 MeV

Cited by 16 publications

References 0 publications

Measurement of the²⁵Mg(α,n)²⁸Si reaction cross section at LNL

Measurement of the²⁵Mg(α,n)²⁸Si reaction cross section at LNL

A new study of 25Mg $(\alpha, n)$ 28Si angular distributions at $E_{\alpha} =3-5$ MeV

The 25Mg (a,n)28Si reaction studied at LNL

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Cross Sections for the 25Mg(α,n)28Si Reaction for Eα < 4.8 MeV

Cited by 16 publications

References 0 publications

Measurement of the25Mg(α,n)28Si reaction cross section at LNL

Measurement of the25Mg(α,n)28Si reaction cross section at LNL

A new study of 25Mg $(\alpha, n)$ 28Si angular distributions at $E_{\alpha} =3-5$ MeV

The 25Mg (a,n)28Si reaction studied at LNL

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Product

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Cross Sections for the ²⁵Mg(α,n)²⁸Si Reaction for E_α < 4.8 MeV

Measurement of the²⁵Mg(α,n)²⁸Si reaction cross section at LNL

Measurement of the²⁵Mg(α,n)²⁸Si reaction cross section at LNL