Measurement and analysis techniques for a study of 12C(p,γ) and 13C(p,γ) deep underground

Skowronski, J.

doi:10.1051/epjconf/202226011008

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…The 12 C(p,γ) 13 N cross section was measured in the proton energy range between 300 and 1900 keV covering the region of the two resonances and reaching the energies of some of the previous low-energy experiments [13][14][15] and the upcoming LUNA data [9]. Table 1 shows the result.…”

Section: Resultsmentioning

confidence: 99%

“…This translates into effective interaction energies between about 15 and 120 keV for 12 C(p,γ) 13 N. This is the energy range where the reaction cross section must be known for the reaction rate determination. With the available experimental technique only the upper part of this energy region can be covered with measurements, the underground experiment of the LUNA collaboration will soon provide data down to about 80 keV [9]. 1 To lower energies, theory-based extrapolation is inevitable, which necessitates high precision cross section at higher energies.…”

Section: Introductionmentioning

confidence: 99%

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Cross section measurement of the $$^{12}$$C(p,$$\gamma $$)$$^{13}$$N reaction with activation in a wide energy range

et al. 2023

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The CNO cycle is one of the fundamental processes of hydrogen burning in stars. The first reaction of the cycle is the radiative proton capture on $$^{12}$$ 12 C and the rate of this $$^{12}$$ 12 C(p,$$\gamma $$ γ )$$^{13}$$ 13 N reaction is related to the $$^{12}$$ 12 C/$$^{13}$$ 13 C ratio observed e.g. in the Solar System. The low-energy cross section of this reaction was measured several times in the past, however, the experimental data are scarce in a wide energy range especially around the resonance at 1.7 MeV. In the present work the $$^{12}$$ 12 C(p,$$\gamma $$ γ )$$^{13}$$ 13 N cross section was measured between 300 and 1900 keV using the activation method. This method was only used several decades ago in the low-energy region. As the activation method provides the total cross section and has uncertainties different from those of the in-beam $$\gamma $$ γ -spectroscopy technique, the present results provide a largely independent data set for future low-energy extrapolations and thus for astrophysical reaction rate calculations.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cross section measurement of the $$^{12}$$C(p,$$\gamma $$)$$^{13}$$N reaction with activation in a wide energy range

et al. 2023

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“…Distinct peaks corresponding to the transitions in 18 F are visible in the red spectrum. This technique has been applied at LUNA to the 12 C(p,γ) 13 N reaction study [46]. The emitted (single) prompt γ-ray has an energy of about 2 MeV (Q = 1943 keV), thus sitting in a region affected by the intrinsic background of the detector.…”

Section: A New Application Of a Segmented Bgo Detector: Activation Co...mentioning

confidence: 99%

Advances in radiative capture studies at LUNA with a segmented BGO detector

Skowronski

Gesuè

Boeltzig

et al. 2023

J. Phys. G: Nucl. Part. Phys.

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Studies of charged-particle reactions for low-energy nuclear astrophysics require high sensitivity, which can be achieved by means of detection setups with high efficiency and low backgrounds, to obtain precise measurements in the energy region of interest for stellar scenarios. High-efficiency total absorption spectroscopy is an established and powerful tool for studying radiative capture reactions, particularly if combined with the cosmic background reduction by several orders of magnitude obtained at the Laboratory for Underground Nuclear Astrophysics (LUNA). We present recent improvements in the detection setup with the Bismuth Germanium Oxide (BGO) detector at LUNA, aiming to reduce high-energy backgrounds and to increase the summing detection efficiency. The new design results in enhanced sensitivity of the BGO setup, as we demonstrate and discuss in the context of the first direct measurement of the 65 keV resonance (Ex = 5672 keV) of the 17O(p,gamma)18F reaction. Moreover, we show two applications of the BGO detector, which exploit its segmentation. In case of complex gamma-ray cascades, e.g. the de-excitation of Ex = 5672 keV in 18F, the BGO segmentation allows to identify and suppress the beam-induced background signals that mimic the sum peak of interest. We demonstrate another new application for such a detector in form of in-site activation measurements of a reaction with beta+ unstable product nuclei, e.g., the 14N(p,gamma)15O reaction.

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Precise resonance parameter measurement in the 12C(p,γ)13N astrophysically important reaction

2023

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Measurement and analysis techniques for a study of ¹²C(p,γ) and ¹³C(p,γ) deep underground

Cited by 4 publications

References 17 publications

Cross section measurement of the $$^{12}$$C(p,$$\gamma $$)$$^{13}$$N reaction with activation in a wide energy range

Cross section measurement of the $$^{12}$$C(p,$$\gamma $$)$$^{13}$$N reaction with activation in a wide energy range

Advances in radiative capture studies at LUNA with a segmented BGO detector

Precise resonance parameter measurement in the 12C(p,γ)13N astrophysically important reaction

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