Journal ArticleDOI
Reprint of: A supersonic jet target for the cross section measurement of the 12 C(α, γ) 16 O reaction with the recoil mass separator ERNA
D. Rapagnani,Raffaele Buompane,A. Di Leva,Lucio Gialanella,Maurizio Busso,M. De Cesare,G. De Stefano,J. G. Duarte,Leandro Gasques,Leandro Gasques,L. Morales Gallegos,Sara Palmerini,M. Romoli,F. Tufariello +13 more
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TLDR
In this paper, a supersonic jet is used to limit the extension of the He gas target, where the oblique shock waves and expansion fans formed at its boundaries confine the gas, which can be efficiently collected using a catcher.Abstract:
12C(α, γ)16O cross section plays a key-role in the stellar evolution and nucleosynthesis of massive stars. Hence, it must be determined with the precision of about 10% at the relevant Gamow energy of 300 keV. The ERNA (European Recoil mass separator for Nuclear Astrophysics) collaboration measured, for the first time, the total cross section of 12C(α, γ)16O by means of the direct detection of the 16O ions produced in the reaction down to an energy of Ecm = 1.9 MeV. To extend the measurement at lower energy, it is necessary to limit the extension of the He gas target. This can be achieved using a supersonic jet, where the oblique shock waves and expansion fans formed at its boundaries confine the gas, which can be efficiently collected using a catcher. A test version of such a system has been designed, constructed and experimentally characterized as a bench mark for a full numerical simulation using FV (Finite Volume) methods. The results of the commissioning of the jet test version and the design of the new system that will be used in combination with ERNA are presented and discussed.read more
Citations
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Formation of GW190521 from stellar evolution: the impact of the hydrogen-rich envelope, dredge-up and $^{12}$C($α$, $γ$)$^{16}$O rate on the pair-instability black hole mass gap
Guglielmo Costa,Guglielmo Costa,Alessandro Bressan,Alessandro Bressan,Michela Mapelli,Michela Mapelli,Paola Marigo,Giuliano Iorio,Giuliano Iorio,Mario Spera +9 more
TL;DR: In this paper, the authors investigated the existence of the pair-instability mass gap in the mass spectrum of black holes and showed that the mass gap can be closed by the collapse of the residual H-rich envelope at metallicity 0.0003.
Journal ArticleDOI
The activation method for cross section measurements in nuclear astrophysics
TL;DR: In this article, the activation method is reviewed from the viewpoint of nuclear astrophysics and various techniques for the measurement of the produced activity are detailed, as well as a special case of activation, the technique of Accelerator Mass Spectrometry in cross section measurements.
Journal ArticleDOI
Status of the JENSA gas-jet target for experiments with rare isotope beams
Konrad Schmidt,Kelly Chipps,S. Ahn,D. W. Bardayan,J. Browne,Uwe Greife,Zach Meisel,Fernando Montes,Patrick O'Malley,W.-J. Ong,Steven D. Pain,Hendrik Schatz,Hendrik Schatz,Karl Smith,Michael Scott Smith,P. Thompson +15 more
TL;DR: The JENSA gas-jet target was designed for experiments with radioactive beams provided by the rare isotope re-accelerator ReA3 at the National Superconducting Cyclotron Laboratory as discussed by the authors.
Journal ArticleDOI
New analytical methods for the assessment of natural (238U, 232Th, 226Ra, 40K) and anthropogenic (137Cs) radionuclides as actinides (239Pu, 240Pu): The case study of the Garigliano NPP releases along the Domitia sandy beaches (Southern Italy)
V. Roviello,M. De Cesare,M. De Cesare,Antonio D'Onofrio,Lucio Gialanella,Y.J. Guan,Y.J. Guan,P. Roos,D. Ruberti,Carlo Sabbarese,Filippo Terrasi +10 more
TL;DR: In this paper, the authors investigated the distribution versus depth of natural (238U, 232Th, 226Ra, 40K) and anthropogenic radionuclides (137Cs, 239Pu, 240Pu) along the Domitia coastal zone (Campania Region, Southern Italy) downstream the Garigliano and Volturno rivers.
Journal ArticleDOI
The Status and Future of Direct Nuclear Reaction Measurements for Stellar Burning
Marialuisa Aliotta,Marialuisa Aliotta,Raffaele Buompane,Raffaele Buompane,Manoel Couder,Aaron Couture,Richard deBoer,A. Formicola,L. Gialanella,L. Gialanella,J. Glorius,Gianluca Imbriani,Gianluca Imbriani,M. Junker,C. Langer,A. Lennarz,Yu. A. Litvinov,Wei Liu,Maria Lugaro,Maria Lugaro,Maria Lugaro,Catalin Matei,Zach Meisel,Luciano Piersanti,Rene Reifarth,Rene Reifarth,D. Robertson,Anna Simon,Oscar Straniero,Aurora Tumino,Michael Wiescher,Yi Xu +31 more
TL;DR: In this article, the status of direct measurements for stellar burning is summarized, focusing on developments of the last couple of decades, and offering a prospectus of near-future developments.
References
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Book
Fundamentals of Aerodynamics
TL;DR: In this article, Navier-Stokes et al. discuss the fundamental principles of Inviscid, Incompressible Flow over airfoils and their application in nonlinear Supersonic Flow.
Journal ArticleDOI
First direct measurement of the total cross-section of 12C(α,γ)16O
D. Schürmann,A. Di Leva,Lucio Gialanella,Detlef Rogalla,Frank Strieder,N. De Cesare,Antonio D'Onofrio,Gianluca Imbriani,R. Kunz,Carmine Lubritto,A. Ordine,Vincenzo Roca,C. Rolfs,Mario R. Romano,F. Schümann,Filippo Terrasi,H. P. Trautvetter +16 more
TL;DR: The total cross-section of 12C(α,γ)16O was measured for the first time by a direct and ungated detection of the 16O recoils as discussed by the authors.
Journal ArticleDOI
First direct measurement of the total cross section of 12C(alpha,gamma)16O
D. Schuermann,A. Di Leva,Lucio Gialanella,Detlef Rogalla,Frank Strieder,N. De Cesare,Antonio D'Onofrio,Gianluca Imbriani,R. Kunz,Carmine Lubritto,A. Ordine,Vincenzo Roca,C. Rolfs,Mario R. Romano,F. Schuemann,Filippo Terrasi +15 more
TL;DR: In this article, the total cross section of 12C(alpha,gamma)16O was measured for the first time by a direct and ungated detection of the 16O recoils.
Journal ArticleDOI
The astrophysical S factor of 12C(α,γ)16O at stellar energy
TL;DR: In this paper, the authors presented a new R-matrix analysis, where systematic uncertainties of the included data sets, in particular the absolute normalization, were treated in the fitting procedure.
Journal ArticleDOI
Recoil separator ERNA: ion beam specifications
Detlef Rogalla,Marialuisa Aliotta,C. A. Barnes,L. Campajola,Antonio D'Onofrio,E. Fritz,L. Gialanella,Uwe Greife,Gianluca Imbriani,A. Ordine,J. Ossmann,Vincenzo Roca,C. Rolfs,Mario R. Romano,Carlo Sabbarese,D. Schürmann,F. Schümann,Frank Strieder,S. Theis,Filippo Terrasi,H. P. Trautvetter +20 more
TL;DR: In this article, a recoil separator ERNA is developed at the 4 MV Dynamitron tandem accelerator in Bochum to detect directly the 16O recoils with about 50% efficiency.