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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
C. Broggini et al., Annu. Rev. Nucl. Part. Sci. 60, 53 (2010)
H. Costantini et al., Rep. Progr. Phys. 72, 086301 (2009)
K.M. Nollett et al., Astrophys. J. 582, 1036 (2003)
M. Lugaro et al., Astron. Astrophys. 461, 657 (2007)
S. Palmerini et al., Astrophys. J. 764, 128 (2013)
D.A. Scott et al., Phys. Rev. Lett. 109, 202 (2012)
A. Di Leva et al., Phys. Rev. C 89, 015803 (2014)
J. Blackmon et al., Phys. Rev. Lett. 74, 2642 (1995)
M.L. Sergi et al., Phys. Rev. C 82, 032801 (2010)
H.T. Fortune, Phys. Rev. C 88, 015801 (2013)
C. Iliadis, Nuclear Physics of Stars (Wiley-VCH Verlag GmbH, 2007)
MIDAS, from http://npg.dl.ac.uk/MIDAS/
A. Caciolli et al., Eur. Phys. J. A 48, 144 (2012)
J. Ziegler, SRIM 2013.00, from http://srim.org
GEANT 4.9.4.p02, from http://geant4.cern.ch
A. Lemut, LSC (Lemut Simulation Code), a GEANT4 parser for low energy nuclear astrophysics, unpublished
C.G. Bruno, Misura della reazione nell'ambito dell'esperimento LUNA, Master's Thesis Università degli Studi di Milano (2013)
C.J. Griffin, Detection efficiency for the reaction at astrophysical energies: A GEANT4 simulation, Physics Masters Project Report, University of Edinburgh (2013)
A. L'Hoir, Nucl. Instrum. Methods 223, 336 (1984)
G. Bortels, P. Collaers, Appl. Radiat. Isot. 38, 831 (1987)
C.G. Bruno, PhD Thesis, University of Edinburgh, UK, in preparation
D.A. Scott, Underground study of the ^17O(p,)^18F reaction at Gamow energies for Classical Novae, PhD Thesis, University of Edinburgh, UK (2014)
A. Chafa et al., Phys. Rev. C 75, 035810 (2007)
A. Formicola et al., Nucl. Instrum. Methods A 507, 609 (2003)
H.W. Becker et al., Z. Phys. A 351, 453 (1995)
J. Newton et al., Phys. Rev. C 75, 055808 (2007)
J. Newton et al., Phys. Rev. C 81, 045801 (2010)
A. Chafa et al., Phys. Rev. Lett. 95, 031101 (2005)
A. Chafa et al., Phys. Rev. Lett. 96, 019902(E) (2006)
B.H. Moazen et al., Phys. Rev. C 75, 065801 (2007)
J. Cruz et al., J. Phys. G: Nucl. Part. Phys. 35, 014004 (2008)
G. Knoll, Radiation Detection and Measurement, 3rd edition (Wiley-VCH Verlag GmbH, 2000).
T. Szücs et al., Eur. Phys. J. A 44, 513 (2010)
M. Junker et al., Phys. Rev. C 57, 5 (1998)
M. Misiaszek et al., Appl. Radiat. Isot. 81, 146 (2013)
Author information
Authors and Affiliations
Consortia
Corresponding author
Additional information
Communicated by N. Alamanos
Rights and permissions
About this article
Cite this article
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
Received:
Accepted:
Published:
DOI: https://doi.org/10.1140/epja/i2015-15094-y