Introduction of the new LUNA experimental setup for high precision measurement of the<sup>13</sup>C(α,n)<sup>16</sup>O reaction for astrophysical purposes

Csedreki, L.; Ciani, G. F.; Kochanek, I.; Best, A.

doi:10.1051/epjconf/201716501017

“…Primary γ rays (E γ = 7840 keV) arising from the 13 C(p,γ) 14 N direct capture transition into the 14 N ground state (hereafter, DC → GS transition) were detected using a HPGe detector with a relative efficiency of 120% and FWHM of 2.8 keV at E γ = 1460 keV. The detector was mounted at 55°to the beam axis and brought to a distance of 5 mm from the target holder [33]. The same type of electronics and DAQ used in the NRRA measurement was used to acquire the γ-spectrum at LUNA.…”

Section: The γ-Shape Measurements At Lunamentioning

confidence: 99%

A new approach to monitor $$^{13}\hbox {C}$$-targets degradation in situ for $$^{13}\hbox {C}(\alpha ,\hbox {n})^{16}\hbox {O}$$ cross-section measurements at LUNA

Ciani

¹

,

Csedreki

²

,

Balibrea

³

et al. 2020

Self Cite

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Direct measurements of reaction cross-sections at astrophysical energies often require the use of solid targets able to withstand high ion beam currents for extended periods of time. Thus, monitoring target thickness, isotopic composition, and target stoichiometry during data taking is critical to account for possible target modifications and to reduce uncertainties in the final cross-section results. A common technique used for these purposes is the Nuclear Resonant Reaction Analysis (NRRA), which however requires that a narrow resonance be available inside the dynamic range of the accelerator used. In cases when this is not possible, as for example the 13 C(α,n) 16 O reaction recently studied at low energies at the Laboratory for Underground Nuclear Astrophysics (LUNA) in Italy, alternative approaches must be found. Here, we present a new application of the shape analysis of primary γ rays emitted by the 13 C(p,γ) 14 N radiative capture reaction. This approach was used to monitor 13 C target degradation in situ during the 13 C(α,n) 16 O data taking campaign. The results obtained are in agreement with evaluations subsequently performed at Atomki (Hungary) using the NRRA method. A preliminary application for the extraction of the 13 C(α,n) 16 O reaction cross-section at one beam energy is also reported.

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“…Primary γ rays (E γ = 7840 keV) arising from the 13 C(p,γ) 14 N direct capture transition into the 14 N ground state (hereafter, DC → GS transition) were detected using a HPGe detector with a relative efficiency of 120% and FWHM of 2.8 keV at E γ = 1460 keV. The detector was mounted at 55°to the beam axis and brought to a distance of 5 mm from the target holder [33]. The same type of electronics and DAQ used in the NRRA measurement was used to acquire the γ-spectrum at LUNA.…”

Section: The γ-Shape Measurements At Lunamentioning

confidence: 99%

A new approach to monitor 13C-targets degradation in situ for 13C(alpha,n)16O cross-section measurements at LUNA

Ciani,

Csedreki,

Balibrea-Correa

et al. 2020

Preprint

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0

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Direct measurements of reaction cross-sections at astrophysical energies often require the use of solid targets able to withstand high ion beam currents for extended periods of time. Thus, monitoring target thickness, isotopic composition, and target stoichiometry during data taking is critical to account for possible target modifications and to reduce uncertainties in the final cross-section results. A common technique used for these purposes is the Nuclear Resonant Reaction Analysis (NRRA), which however requires that a narrow resonance be available inside the dynamic range of the accelerator used. In cases when this is not possible, as for example the 13 C(α,n) 16 O reaction recently studied at low energies at the Laboratory for Underground Nuclear Astrophysics (LUNA) in Italy, alternative approaches must be found. Here, we present a new application of the shape analysis of primary γ rays emitted by the 13 C(p,γ) 14 N radiative capture reaction. This approach was used to monitor 13 C target degradation in situ during the 13 C(α,n) 16 O data taking campaign. The results obtained are in agreement with evaluations subsequently performed at Atomki (Hungary) using the NRRA method. A preliminary application for the extraction of the 13 C(α,n) 16 O reaction cross-section at one beam energy is also reported.

show abstract

The LUNA Neutron Detector Array for the Direct Measurement of the $$^{13}{\hbox {C}}$$ ( $$\alpha $$ ,n) $$^{16}{\hbox {O}}$$ Nuclear Reaction

Csedreki

¹

,

Ciani

²

,

Best

³

et al. 2019

Springer Proceedings in Physics

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Introduction of the new LUNA experimental setup for high precision measurement of the¹³C(α,n)¹⁶O reaction for astrophysical purposes

Cited by 4 publications

References 11 publications

A new approach to monitor $$^{13}\hbox {C}$$-targets degradation in situ for $$^{13}\hbox {C}(\alpha ,\hbox {n})^{16}\hbox {O}$$ cross-section measurements at LUNA

A new approach to monitor $$^{13}\hbox {C}$$-targets degradation in situ for $$^{13}\hbox {C}(\alpha ,\hbox {n})^{16}\hbox {O}$$ cross-section measurements at LUNA

A new approach to monitor 13C-targets degradation in situ for 13C(alpha,n)16O cross-section measurements at LUNA

The LUNA Neutron Detector Array for the Direct Measurement of the $$^{13}{\hbox {C}}$$ ( $$\alpha $$ ,n) $$^{16}{\hbox {O}}$$ Nuclear Reaction

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Introduction of the new LUNA experimental setup for high precision measurement of the13C(α,n)16O reaction for astrophysical purposes

Cited by 4 publications

References 11 publications

A new approach to monitor $$^{13}\hbox {C}$$-targets degradation in situ for $$^{13}\hbox {C}(\alpha ,\hbox {n})^{16}\hbox {O}$$ cross-section measurements at LUNA

A new approach to monitor $$^{13}\hbox {C}$$-targets degradation in situ for $$^{13}\hbox {C}(\alpha ,\hbox {n})^{16}\hbox {O}$$ cross-section measurements at LUNA

A new approach to monitor 13C-targets degradation in situ for 13C(alpha,n)16O cross-section measurements at LUNA

The LUNA Neutron Detector Array for the Direct Measurement of the $$^{13}{\hbox {C}}$$ ( $$\alpha $$ ,n) $$^{16}{\hbox {O}}$$ Nuclear Reaction

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Product

Resources

About

Introduction of the new LUNA experimental setup for high precision measurement of the¹³C(α,n)¹⁶O reaction for astrophysical purposes