Deformation effects on isoscalar giant resonances in Mg24

Y. K. Gupta, U. Garg, J. Hoffman, J. Matta, P. V. Madhusudhana Rao, D. Patel, T. Peach, K. Yoshida, M. Itoh, M. Fujiwara, K. Hara, H. Hashimoto, K. Nakanishi, M. Yosoi, H. Sakaguchi, S. Terashima, S. Kishi, T. Murakami, M. Uchida, Y. Yasuda, H. Akimune, T. Kawabata, and M. N. Harakeh
Phys. Rev. C 93, 044324 – Published 21 April 2016

Abstract

Strength distributions for isoscalar giant resonances with multipolarity L2 have been determined in Mg24 from “instrumental background-free” inelastic scattering of 386-MeV α particles at extreme forward angles, including 0. The isoscalar E0, E1, and E2 strengths are observed to be 57±7%, 111.17.2+10.9%, and 148.6±7.3%, respectively, of their energy-weighted sum rules in the excitation energy range of 6 to 35 MeV. The isoscalar giant monopole (ISGMR) and quadrupole (ISGQR) resonances exhibit a prominent K splitting which is consistent with microscopic theory for a prolate-deformed ground state of Mg24. For the ISGQR it is due to splitting of the three K components, whereas for the ISGMR it is due to its coupling to the K=0 component of the ISGQR. Deformation effects on the isoscalar giant dipole resonance are less pronounced, however.

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  • Received 21 February 2016

DOI:https://doi.org/10.1103/PhysRevC.93.044324

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Y. K. Gupta*, U. Garg, J. Hoffman, J. Matta, P. V. Madhusudhana Rao§, D. Patel, and T. Peach

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

K. Yoshida

  • Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan and Center for Computational Sciences, University of Tsukuba, Tsukuba 305-8577, Japan

M. Itoh, M. Fujiwara, K. Hara, H. Hashimoto, K. Nakanishi, and M. Yosoi

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

H. Sakaguchi, S. Terashima, S. Kishi, T. Murakami, M. Uchida#, and Y. Yasuda

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

H. Akimune

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

T. Kawabata**

  • Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan

M. N. Harakeh

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

  • *Permanent address: Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
  • Present address: Volcano Corporation, San Diego, CA 92130, USA.
  • Present address: Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37380, USA.
  • §Present address: Department of Nuclear Physics, Andhra University, Visakhapatnam 530 030, India.
  • Present address: M.D. Anderson Cancer Center, Houston, TX 77030, USA.
  • Present address: Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan.
  • #Present address: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8850, Japan.
  • **Present address: Department of Physics, Kyoto University, Kyoto 606-8502, Japan.

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Issue

Vol. 93, Iss. 4 — April 2016

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