Direct measurement of the<sup>15</sup>N(p,γ)<sup>16</sup>O total cross section at novae energies

Bemmerer, D.; Caciolli, A.; Bonetti, R.; Broggini, C.; Confortola, F.; Corvisiero, P.; Costantini, H.; Elekes, Z.; Formicola, A.; Fülöp, Zs.; Gervino, G.; Guglielmetti, A.; Gustavino, C.; Gyürky, Gy.; Junker, M.; Limata, B.; Marta, M.; Menegazzo, R.; Prati, P.; Roca, V.; Rolfs, C.; Alvarez, C. Rossi; Somorjai, E.; Straniero, O.

doi:10.1088/0954-3899/36/4/045202

Cited by 64 publications

(82 citation statements)

References 32 publications

(153 reference statements)

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“…The cross sections of Ref. [35] are multiplied by a significantly larger factor of 1.23 but this value remains within the large systematic uncertainty estimated in that work.…”

Section: Discussionsupporting

confidence: 58%

“…[35,36] have improved statistical measurements but suffer from large systematic uncertainties. For this reason, these data sets are normalized to the on-resonance measurements of Ref.…”

Section: Discussionmentioning

confidence: 99%

“…3, the total cross section data from Refs. [36] (Table 1) and [35] (Table 3), shown in Fig. 4), and the cascade transition data from Ref.…”

mentioning

confidence: 99%

“…16 O cross section data of Refs. [35,36] normalized to the R-matrix fit. The inset shows the calculation at higher energies based on the sum of the contributions from the cascade transitions of Ref.…”

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confidence: 99%

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R-matrix analysis of16O compound nucleus reactions

et al. 2013

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Background Over the last 60 years, a large amount of experimental nuclear data has been obtained for reactions which probe the 16 O compound nucleus near the alpha and proton separation energies, the energy regimes most important for nuclear astrophysics. Difficulties and inconsistencies in R-matrix fits of the individual reactions prompt a more complete analysis.Purpose Determine the level of consistency between the wide variety of experimental data using a multiple entrance/exit channel R-matrix framework. Using a consistent set of data from multiple reaction channels, attain an improved fitting for the 15 N(p, γ0) 16 O reaction data.Methods Reaction data for all available reaction channels were fit simultaneous using a multichannel R-matrix code.Results Over the wide range of experimental data considered, a high level of consistency was found, resulting in a single consistent R-matrix fit which described the broad level structure of 16 O below Ex = 13.5 MeV. The resulting fit was used to extract an improved determination of the low energy S-factor for the reactions 15 N(p, γ) 16 O and 15 N(p, α) 12 C. ConclusionThe feasibility and advantages of a complete multiple entrance/exit channel R-matrix description for the broad level structure of 16 O has been achieved. A future publication will investigate the possible effects of the multiple channel analysis on the reaction 12 C(α, γ) 16 O.

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“…The cross sections of Ref. [35] are multiplied by a significantly larger factor of 1.23 but this value remains within the large systematic uncertainty estimated in that work.…”

Section: Discussionsupporting

confidence: 58%

“…[35,36] have improved statistical measurements but suffer from large systematic uncertainties. For this reason, these data sets are normalized to the on-resonance measurements of Ref.…”

Section: Discussionmentioning

confidence: 99%

“…3, the total cross section data from Refs. [36] (Table 1) and [35] (Table 3), shown in Fig. 4), and the cascade transition data from Ref.…”

mentioning

confidence: 99%

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confidence: 99%

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R-matrix analysis of16O compound nucleus reactions

et al. 2013

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“…In a first effort, a re-analysis of the data acquired during a past measurement of the 14 N(p,) 15 O reaction with a high efficiency BGO detector was performed, exploiting the fact that the gas target was composed of natural nitrogen (0.3% 15 N). The data covered only a limited energy range (90-230 keV) and were affected by large uncertainties at low energy [45]. A subsequent systematic study using enriched 15 N solid target and HPGe detectors was then undertaken in collaboration with the University of Notre Dame (USA).…”

Section: -P3mentioning

confidence: 99%

Recent results on (p,γ) and (α,γ) fusion reactions at LUNA

Guglielmetti

2011

EPJ Web of Conferences

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Abstract. At temperatures typical of astrophysical environments, nuclear cross sections are extremely small and experimental measurements in a laboratory at the Earth's surface are hampered by the cosmic background. The LUNA collaboration has exploited the unique features of background reduction offered by the rock overburden above the LNGS underground laboratory in order to study very important hydrogen-burning reactions at their relevant astrophysical energies. After a general introduction on the LUNA experiment, this paper reports on the most important results for the (p,) and (,) fusion reactions measured so far and their astrophysical consequences. A quick look on the future possibilities is also given.

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Radiative n 10B Capture at Thermal and Astrophysical Energies

Dubovichenko

2014

Russ Phys J

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We have studied the neutron-capture reactions 10,11 B(n, ) and the role of the 11 B(n, ) reaction in seeding r-process nucleosynthesis. The possibility of the description of the available experimental data for cross sections of the neutron capture reaction on 10 B at thermal and astrophysical energies, taking into account the resonance at 475 keV, was considered within the framework of the modified potential cluster model (MPCM) with forbidden states and accounting for the resonance behavior of the scattering phase shifts. In the framework of the same model the possibility of describing the available experimental data for the total cross sections of the neutron radiative capture on 11 B at thermal and astrophysical energies were considered with taking into account the 21 and 430 keV resonances. Description of the available experimental data on the total cross sections and astrophysical S-factor of the radiative proton capture on 11 B to the ground state of 12 C was treated at astrophysical energies. The possibility of description of the experimental data for the astrophysical S-factor of the radiative proton capture on 14 C to the ground state of 15 N at astrophysical energies, and the radiative proton capture on 15 N at the energies from 50 to 1500 keV was considered in the framework of the MPCM with the classification of the orbital states according to Young tableaux. It was shown that, on the basis of the M1 and the E1 transitions from different states of the p 15 N scattering to the ground state of 16 O in the p 15 N channel, it is quite succeed to explain general behavior of the S-factor in the considered energy range in the presence of two resonances.PACS Number(s): 21.60. Gx, 25.20.Lj, 25.40.Lw, 26.20.Np, 26.35.+c, 26.50.+x, 26.90.+n, 98.80.Ft The measurements of the reaction rate for 11 В(р,) process at low energies, generally, are focused in the narrow resonance range at Е р = 163 keV with small width. Study of this resonance with the help of the 11 В(р, 0+1 ) reaction 8 allows one to obtain width of  = 6.7 keV and cross section of   = 125 μb in the resonance range, which differ from the assumed values 9 ( = 5.3 keV and   = 158 μb) more than by 20%. The values  = 5.4 keV and   = 130 μb were obtained relatively recently in Ref. 10, and was drawn the conclusion that this resonance plays the key role in the determination of the reaction rate for the 11 В(р,) process at low and astrophysical energies. Therefore, this reaction can play the certain role in different thermonuclear processes in the Universe at synthesis of 12 C.Recently, for example in Ref. 11, it was supposed that baryon number fluctuations in the early Universe lead to the formation of high-density proton-rich and low-density neutron-rich regions. This might be the result of the nucleosynthesis of elements with mass A  12 in the neutron-rich regions of the early Universe. 12,13 The special interest is the nucleus 14 C, 14 which is produced by successive neutron capture 1,2,3,4,5 … 12 C(n,γ) 13 C(n,γ) 14 C … .(3)The nucleus 14...

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Direct measurement of the¹⁵N(p,γ)¹⁶O total cross section at novae energies

Cited by 64 publications

References 32 publications

R-matrix analysis of16O compound nucleus reactions

R-matrix analysis of16O compound nucleus reactions

Recent results on (p,γ) and (α,γ) fusion reactions at LUNA

Radiative n 10B Capture at Thermal and Astrophysical Energies

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Direct measurement of the15N(p,γ)16O total cross section at novae energies

Cited by 64 publications

References 32 publications

R-matrix analysis of16O compound nucleus reactions

R-matrix analysis of16O compound nucleus reactions

Recent results on (p,γ) and (α,γ) fusion reactions at LUNA

Radiative n 10B Capture at Thermal and Astrophysical Energies

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Product

Resources

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Direct measurement of the¹⁵N(p,γ)¹⁶O total cross section at novae energies