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Scott M, Zegers RGT, Almus R, et al. Observation of the Isovector Giant Monopole Resonance via the ^{28}Si(^{10}Be,^{10}B^{*}[1.74  MeV]) Reaction at 100  AMeV. Phys Rev Lett. 2017;118(17):172501doi: 10.1103/PhysRevLett.118.172501.
Scott, M., Zegers, R. G. T., Almus, R., Austin, S. M., Bazin, D., Brown, B. A., Campbell, C., Gade, A., Bowry, M., Galès, S., Garg, U., Harakeh, M. N., Kwan, E., Langer, C., Loelius, C., Lipschutz, S., Litvinova, E., Lunderberg, E., Morse, C., Noji, S., Perdikakis, G., Redpath, T., Robin, C., Sakai, H., Sasamoto, Y., Sasano, M., Sullivan, C., Tostevin, J. A., Uesaka, T., & Weisshaar, D. (2017). Observation of the Isovector Giant Monopole Resonance via the ^{28}Si(^{10}Be,^{10}B^{*}[1.74  MeV]) Reaction at 100  AMeV. Physical review letters, 118(17), 172501. https://doi.org/10.1103/PhysRevLett.118.172501
Scott, M, et al. "Observation of the Isovector Giant Monopole Resonance via the ^{28}Si(^{10}Be,^{10}B^{*}[1.74  MeV]) Reaction at 100  AMeV." Physical review letters vol. 118,17 (2017): 172501. doi: https://doi.org/10.1103/PhysRevLett.118.172501
Scott M, Zegers RGT, Almus R, Austin SM, Bazin D, Brown BA, Campbell C, Gade A, Bowry M, Galès S, Garg U, Harakeh MN, Kwan E, Langer C, Loelius C, Lipschutz S, Litvinova E, Lunderberg E, Morse C, Noji S, Perdikakis G, Redpath T, Robin C, Sakai H, Sasamoto Y, Sasano M, Sullivan C, Tostevin JA, Uesaka T, Weisshaar D. Observation of the Isovector Giant Monopole Resonance via the ^{28}Si(^{10}Be,^{10}B^{*}[1.74  MeV]) Reaction at 100  AMeV. Phys Rev Lett. 2017 Apr 28;118(17):172501. doi: 10.1103/PhysRevLett.118.172501. Epub 2017 Apr 28. PMID: 28498679.
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Phys Rev Lett. 2017 Apr 28;118(17):172501. doi: 10.1103/PhysRevLett.118.172501. Epub 2017 Apr 28.

Observation of the Isovector Giant Monopole Resonance via the ^{28}Si(^{10}Be,^{10}B^{*}[1.74  MeV]) Reaction at 100  AMeV.

Physical review letters

M Scott, R G T Zegers, R Almus, Sam M Austin, D Bazin, B A Brown, C Campbell, A Gade, M Bowry, S Galès, U Garg, M N Harakeh, E Kwan, C Langer, C Loelius, S Lipschutz, E Litvinova, E Lunderberg, C Morse, S Noji, G Perdikakis, T Redpath, C Robin, H Sakai, Y Sasamoto, M Sasano, C Sullivan, J A Tostevin, T Uesaka, D Weisshaar

Affiliations

  1. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  2. Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA.
  3. Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
  4. Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA.
  5. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
  6. IPN Orsay, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France.
  7. Horia Hulubei National Institute of Physics and Nuclear Engineering, P.O. Box MG6, Bucharest, Romania.
  8. Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA.
  9. Kernfysisch Versneller Instituut-Center for Advanced Radiation Technology, University of Groningen, Groningen, 9747 AA, Netherlands.
  10. Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008-5252, USA.
  11. RIKEN, Nishina Center, Wako, 351-0198, Japan.
  12. Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan.
  13. Department of Physics, University of Surrey, Guilford, Surrey GU2 7XH, United Kingdom.

PMID: 28498679 DOI: 10.1103/PhysRevLett.118.172501

Abstract

The (^{10}Be,^{10}B^{*}[1.74  MeV]) charge-exchange reaction at 100  AMeV is presented as a new probe for isolating the isovector (ΔT=1) nonspin-transfer (ΔS=0) response of nuclei, with ^{28}Si being the first nucleus studied. By using a secondary ^{10}Be beam produced by fast fragmentation of ^{18}O nuclei at the NSCL Coupled Cyclotron Facility, applying the dispersion-matching technique with the S800 magnetic spectrometer to determine the excitation energy in ^{28}Al, and performing high-resolution γ-ray tracking with the Gamma-Ray Energy Tracking In-beam Nuclear Array (GRETINA) to identify the 1022-keV γ ray associated with the decay from the 1.74-MeV T=1 isobaric analog state in ^{10}B, a ΔS=0 excitation-energy spectrum in ^{28}Al was extracted. Monopole and dipole contributions were determined through a multipole-decomposition analysis, and the isovector giant dipole resonance and isovector giant monopole resonance (IVGMR) were identified. The results show that this probe is a powerful tool for studying the elusive IVGMR, which is of interest for performing stringent tests of modern density functional theories at high excitation energies and for constraining the bulk properties of nuclei and nuclear matter. The extracted distributions were compared with theoretical calculations based on the normal-modes formalism and the proton-neutron relativistic time-blocking approximation. Calculated cross sections based on these strengths underestimate the data by about a factor of 2, which likely indicates deficiencies in the reaction calculations based on the distorted wave Born approximation.

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