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Resonance strengths in the 17,18O(p, α)14,15N reactions and background suppression underground

Commissioning of a new setup for charged-particle detection at LUNA

Abstract.

We report on measurements of resonance strengths and energies for the \( E_{p} = 151\) and 193 keV resonances in the 18O(p,\(\alpha\))15N and 17O(p,\(\alpha\))14N reactions, respectively, obtained during commissioning of a new setup for alpha-particle detection studies at the LUNA underground laboratory. Our values, \(\omega\gamma (151)=164.2\pm 0.9_{stat} {}^{+12.1}_{-11.7} {}_{syst}\) meV and \(\omega\gamma (193)=1.68\pm 0.03_{stat} \pm 0.12_{syst}\) meV, are in excellent agreement with those reported in the literature. New values of resonance energies are \( E_{p}=151.2 \pm 0.3\) keV and \( E_{p}=194.8 \pm 0.3\) keV, respectively, this latter with the highest precision to date. Comparative background measurements in silicon detectors overground and underground were also carried out, yielding up to a factor of 15 in background suppression at LUNA at energies around 200keV. This clearly demonstrates the usefulness of underground measurements in charged-particles experiments, especially at low detection energies.

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Correspondence to M. Aliotta.

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Communicated by N. Alamanos

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LUNA Collaboration., Bruno, C.G., Scott, D.A. et al. Resonance strengths in the 17,18O(p, α)14,15N reactions and background suppression underground. Eur. Phys. J. A 51, 94 (2015). https://doi.org/10.1140/epja/i2015-15094-y

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Keywords

  • Alpha Particle
  • Foil Thickness
  • Background Suppression
  • Target Holder
  • Resonance Strength