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Resolution of a long-standing discrepancy in the \(^{17}\)O\(+^{12}\)C fusion excitation function

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Abstract

There has been a long-standing discrepancy between existing measurements of the total fusion cross section for the \(^{17}\)O \(+ ^{12}\)C system at \(E_\mathrm {c.m.} \sim 14\) MeV. In order to resolve this inconsistency, the cross section was measured in two overlapping energy ranges using an \(^{17}\)O beam and the Encore active target detector at Florida State University. Encore is a self-normalizing detector that measures a large portion of the fusion excitation function with a single beam energy. It also provides full angular coverage of the measured evaporation residues, thus ensuring a model independent measurement of the total fusion cross section. The data reported here show an oscillatory structure not previously observed in this system and agree with all previously reported measurements, resolving the long-standing discrepancy. Coupled reaction channels calculations reproduce the data except in the region of the the oscillation, which matches a similar structure seen in the \(^{16}\)O \(+ ^{12}\)C total fusion excitation function.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The data generated in the current study is listed in Table 1 and is available from the corresponding author upon reasonable request.]

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Acknowledgements

This work was supported by the U.S. National Science Foundation under grants PHY-1712953 and PHY-2012522, and by the State of Florida.

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Authors and Affiliations

  1. Department of Physics, Florida State University, Tallahassee, Florida, 32306, USA

    B. W. Asher, S. Almaraz-Calderon, K. W. Kemper, L. T. Baby, E. Lopez-Saavedra, A. B. Morelock, J. F. Perello & Vandana Tripathi

  2. National Centre for Nuclear Research, ul. Andrzeja Sołtana 7, 05-400, Otwock, Poland

    N. Keeley

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Communicated by Alexandre Obertelli.

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Asher, B.W., Almaraz-Calderon, S., Kemper, K.W. et al. Resolution of a long-standing discrepancy in the \(^{17}\)O\(+^{12}\)C fusion excitation function. Eur. Phys. J. A 57, 272 (2021). https://doi.org/10.1140/epja/s10050-021-00584-8

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