Are there nuclear structure effects on the isoscalar giant monopole resonance near A=90?

ORAL

Abstract

The excitation energy of the isoscalar giant monopole resonance (ISGMR) exhibits, in general, a very smooth behavior (E$_{x}\sim A^{1/3}$) over the periodic Table. In recent work\footnote{D. H. Youngblood \emph{et al.}, Phys. Rev. C \textbf{88}, 021301 (2013)} the Texas A\&M group has reported that ISGMR energies for $^{92}$Zr and $^{92}$Mo are appreciably higher than that for $^{90}$Zr, suggesting significant nuclear structure effects on ISGMR and, hence, on the nuclear compressibility. We have measured inelastic scattering of 385-MeV a particles on $^{90, 92}$Zr, $^{92}$Mo at extremely forward angles, including 0$^{\circ}$, using the ``Grand Raiden'' spectrometer at RCNP, Japan. Results of detailed multipole decomposition analyses to extract the ISGMR strength distributions in the three nuclei will be presented.

*Supported in part by the National Science Foundation (Grant No. PHY1419765).

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Authors

  • Yogesh Gupta

    • Physics Department, University of Notre Dame, Notre Dame, IN 46556, USA

  • Umesh Garg

    • Physics Department, University of Notre Dame, Notre Dame, IN 46556, USA
    • University of Notre Dame

  • K. Howard

    • Physics Department, University of Notre Dame, Notre Dame, IN 46556, USA

  • M. Senyigit

    • Physics Department, University of Notre Dame, Notre Dame, IN 46556, USA

  • M. Itoh

    • Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan

  • S. Ando

    • Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan

  • A. Uchiyama

    • Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan

  • T. Aoki

    • Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan

  • C. Iwamoto

    • Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan

  • S. Adachi

    • Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan

  • A. Tamii

    • Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan

  • M. Fujiwara

    • Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan

  • C. Kadono

    • Department of Physics, Konan University, Hyogo 658-8501, Japan

  • H. Akimune

    • Department of Physics, Konan University, Hyogo 658-8501, Japan

  • Y. Matsuda

    • Department of Physics, Konan University, Hyogo 658-8501, Japan

  • T. Nakahara

    • Department of Physics, Konan University, Hyogo 658-8501, Japan

  • T. Kawabata

    • Department of Physics, Kyoto University, Kyoto 606-8502, Japan

  • M. Tsumura

    • Department of Physics, Kyoto University, Kyoto 606-8502, Japan

  • T. Furuno

    • Department of Physics, Kyoto University, Kyoto 606-8502, Japan

  • M. Harakeh

    • KVI-CART, University of Groningen, 9747 AA Groningen, The Netherlands

  • N. Kalantar-Nayestanaki

    • KVI-CART, University of Groningen, 9747 AA Groningen, The Netherlands