R. Marks

Publications (4)7.37 Total impact

• Article: Isoscalar giant resonances in the Sn nuclei and implications for the asymmetry term in the nuclear-matter incompressibility

  T. Li, U. Garg, Y. Liu, R. Marks, B. K. Nayak, P. V. Madhusudhana Rao, M. Fujiwara, H. Hashimoto, K. Nakanishi, S. Okumura, [......], Y. Iwao, T. Kawabata, T. Murakami, H. Sakaguchi, S. Terashima, Y. Yasuda, J. Zenihiro, H. Akimune, K. Kawase, M. N. Harakeh
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  ABSTRACT: We have investigated the isoscalar giant resonances in the Sn isotopes using inelastic scattering of 386-MeV α particles at extremely forward angles, including 0°. We have obtained completely “background-free” inelastic-scattering spectra for the Sn isotopes over the angular range 0°–9° and up to an excitation energy of 31.5 MeV. The strength distributions for various multipoles were extracted by a multipole decomposition analysis based on the expected angular distributions of the respective multipoles. We find that the centroid energies of the isoscalar giant monopole resonance (ISGMR) in the Sn isotopes are significantly lower than the theoretical predictions. In addition, based on the ISGMR results, a value of Kτ=-550±100 MeV is obtained for the asymmetry term in the nuclear incompressibility. Constraints on interactions employed in nuclear structure calculations are discussed on the basis of the experimentally obtained values for K∞ and Kτ.
  Phys. Rev. C. 03/2010; 81(3).
• Article: Isotopic dependence of the giant monopole resonance in the even-A 112-124Sn isotopes and the asymmetry term in nuclear incompressibility.

  T Li, U Garg, Y Liu, R Marks, B K Nayak, P V Madhusudhana Rao, M Fujiwara, H Hashimoto, K Kawase, K Nakanishi, [......], M Uchida, T Kawabata, H Akimune, Y Iwao, T Murakami, H Sakaguchi, S Terashima, Y Yasuda, J Zenihiro, M N Harakeh
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  ABSTRACT: The strength distributions of the giant monopole resonance (GMR) have been measured in the even-A Sn isotopes (A=112-124) with inelastic scattering of 400-MeV alpha particles in the angular range 0 degrees -8.5 degrees . We find that the experimentally observed GMR energies of the Sn isotopes are lower than the values predicted by theoretical calculations that reproduce the GMR energies in 208Pb and 90Zr very well. From the GMR data, a value of Ktau = -550 +/- 100 MeV is obtained for the asymmetry term in the nuclear incompressibility.
  Physical Review Letters 11/2007; 99(16):162503. · 7.37 Impact Factor
• Source

  Available from: Harutaka Sakaguchi

  Article: The Giant Monopole Resonance in the $^{112-124}$Sn Isotopes and the Symmetry Energy Term in Nuclear Incompressibility

  T Li, U. Garg, Y Liu, R. Marks, B. K. Nayak, P. V. Madhusudhana Rao, M Fujiwara, H Hashimoto, K Kawase, K Nakanishi, [......], M Uchida, T Kawabata, H. Akimune, Y Iwao, T Murakami, H Sakaguchi, S Terashima, Y Yasuda, J. Zenihiro, M. N. Harakeh
  [show abstract] [hide abstract]
  ABSTRACT: We have investigated the isoscalar giant monopole resonance (GMR) in the Sn isotopes, using inelastic scattering of 400-MeV $\alpha$-particles at extremely forward angles, including 0 deg. A value of -550 \pm 100 MeV has been obtained for the asymmetry term, $K_\tau$, in the nuclear incompressibility.
  10/2007;
• Source

  Available from: Harutaka Sakaguchi

  Article: Isotopic dependence of the giant monopole resonance in the even-A ^{112-124}Sn isotopes and the asymmetry term in nuclear incompressibility

  T Li, U. Garg, Y Liu, R. Marks, B. K. Nayak, P. V. Madhusudhana Rao, M Fujiwara, H Hashimoto, K Kawase, K Nakanishi, [......], M Uchida, T Kawabata, H. Akimune, Y Iwao, T Murakami, H Sakaguchi, S Terashima, Y Yasuda, J. Zenihiro, M. N. Harakeh
  [show abstract] [hide abstract]
  ABSTRACT: The strength distributions of the giant monopole resonance (GMR) have been measured in the even-A Sn isotopes (A=112--124) with inelastic scattering of 400-MeV $\alpha$ particles in the angular range $0^\circ$--$8.5^\circ$. We find that the experimentally-observed GMR energies of the Sn isotopes are lower than the values predicted by theoretical calculations that reproduce the GMR energies in $^{208}$Pb and $^{90}$Zr very well. From the GMR data, a value of $K_{\tau} = -550 \pm 100$ MeV is obtained for the asymmetry-term in the nuclear incompressibility.
  10/2007;