Browsing by Subject "EXCITATION"

Now showing items 1-20 of 24

    • Density slope of the nuclear symmetry energy from the neutron skin thickness of heavy nuclei 

      Chen, Lie-Wen; Ko, Che Ming; Li, Bao-An; Xu, Jun. (American Physical Society, 2010)
      Expressing explicitly the parameters of the standard Skyrme interaction in terms of the macroscopic properties of asymmetric nuclear matter, we show in the Skyrme-Hartree-Fock approach that unambiguous correlations exist ...

    • Dielectronic-Recombination Cross-Sections of Hydrogenlike Argon 

      Dewitt, D. R.; Schneider, D.; Clark, M. W.; Chen, M. H.; Church, David A. (American Physical Society, 1991)
      Relative dielectronic-recombination cross sections for hydrogenlike argon are presented. The contributions of the KLL, KLM, KLN, KLO, and KLP groups of resonances are compared to theoretical calculations. The experimental ...

    • Functional Keldysh theory of spin torques 

      Duine, R. A.; Nunez, A. S.; Sinova, Jairo; MacDonald, A. H. (American Physical Society, 2007)
      We present a microscopic treatment of current-induced torques and thermal fluctuations in itinerant ferromagnets based on a functional formulation of the Keldysh formalism. We find that the nonequilibrium magnetization ...

    • Gamow-Teller strength of Mg-26 

      Xu, HM; Gagliardi, Carl A.; Ajupova, G. K.; Kokenge, B.; Lui, YW. (American Physical Society, 1996)
      We have measured cross sections for (d,He-2)-induced reactions on Mg-26 at an energy of E(d)=125.2 MeV. The measured Gamow-Teller strength is significantly smaller than that inferred from (p,n) reactions. We demonstrate ...

    • Giant monopole resonance strength in Ca-40 

      Youngblood, David H.; Lui, YW; Clark, HL. (American Physical Society, 1997)
      The giant resonance region in Ca-40 was studied with inelastic scattering of 240 MeV alpha particles at small angles including 0 degrees. A peak at E-x = 17.5 +/- 0.4 MeV with Gamma = 4.95 +/- 0.25 MeV was found to contain ...

    • Giant monopole resonance strength in Si-28 

      Youngblood, David H.; Clark, HL; Lui, YW. (American Physical Society, 1998)
      The giant resonance region in Si-28 was studied with inelastic scattering of 240 MeV alpha particles at small angles including 0 degrees. The giant resonance peak extended from E-x=12 MeV to 35 MeV and E0 strength corresponding ...

    • Giant monopole strength in Ni-58 

      Lui, YW; Clark, HL; Youngblood, David H. (American Physical Society, 2000)
      The strength distribution of the giant monopole resonance in Ni-58 has been measured from E-x = 10 to 35 MeV using small-angle scattering of 240-MeV alpha particles. E0 strength corresponding to 74(-12)(+22)% of the E0 ...

    • Giant resonances in (116)Sn from 240 MeV (6)Li scattering 

      Chen, X.; Lui, Y. -W; Clark, H. L.; Tokimoto, Y.; Youngblood, David H. (American Physical Society, 2009)
      Giant resonances in (116)Sn were measured by inelastic scattering of (6)Li ions at E(6)Li=240 MeV over the angle range 0(degrees)-6(degrees). Isoscalar E0-E3 strength distributions were obtained with a double folding model ...

    • Giant resonances in Mg-24 

      Youngblood, David H.; Lui, YW; Clark, HL. (American Physical Society, 1999)
      The giant resonance region in Mg-24 was studied with inelastic scattering of 240 MeV alpha particles at small angles including 0 degrees. The giant resonance peak was found to extend up to E-X = 41 MeV. Isoscalar E0, E1, ...

    • Giant resonances in O-16 

      Lui, YW; Clark, HL; Youngblood, David H. (American Physical Society, 2001)
      Giant resonances in O-16 have been studied with inelastic scattering of 240 MeV alpha particles at small angles, Isoscalar E0, E1, and E2 strength corresponding to 48 +/- 10%, 32 +/- 7%, and 53 +/- 10%, of the respective ...

    • Giant resonances in Ti-46,Ti-48 

      Tokimoto, Y.; Lui, Y. -W; Clark, H. L.; John, B.; Chen, X.; Youngblood, David H. (American Physical Society, 2006)
      The giant resonance region from 9 MeV < E-x < 55 MeV in Ti-46 and Ti-48 has been studied with inelastic scattering of 240 MeV alpha particles at small angles including 0(degrees). Isoscalar monopole strength in Ti-46 (Ti-48) ...

    • High energy octupole resonance in Sn-116 

      Clark, HL; Youngblood, David H.; Lui, YW. (American Physical Society, 1996)
      The region of excitation energy from 7 less than or equal to E(x) less than or equal to 38 MeV in Sn-116 was studied with inelastic scattering of 240 MeV alpha particles. Parameters obtained for the isoscalar giant monopole ...

    • High lying E0 strength in C-12 

      Youngblood, David H.; Lui, YW; Clark, HL. (American Physical Society, 1998)
      The excitation region in C-12 from 7 MeV<E-x<60 MeV was studied with inelastic scattering of 240-MeV alpha particles at small angles including 0 degrees where E0 strength is enhanced. The strengths of known 0(+) states at ...

    • Improved fluorescence-enhanced optical imaging and tomography by enhanced excitation light rejection 

      Hwang, Kil Dong (2009-05-15)
      Fluorescence enhanced optical imaging and tomography studies involve the detection of weak fluorescent signals emanating from nano- to picomolar concentrations of exogenous or endogenously produced fluorophore concurrent ...

    • Isoscalar E0-E3 strength in Sn-116, Sm-144, Sm-154, and Pb-208 

      Youngblood, David H.; Lui, YW; Clark, HL; John, B.; Tokimoto, Y.; Chen, X. (American Physical Society, 2004)
      The giant resonance region from 10 MeV<E-x<55 MeV in Sn-116, Sm-144, Sm-154, and Pb-208 has been studied with inelastic scattering of 240 MeV alpha particles at small angles including 0degrees. Essentially all of the ...

    • Isoscalar electric multipole strength in C-12 

      John, B.; Tokimoto, Y.; Lui, YW; Clark, HL; Chen, X.; Youngblood, David H. (American Physical Society, 2003)
      The excitation region in C-12 below E-x=45 MeV was studied using 240 MeV alpha-particle scattering. Elastic scattering was measured from theta(c.m.)=3.8degrees to 49.4degrees and density dependant folding optical model ...

    • Isoscalar giant dipole resonance in Zr-90, Sn-116, and Pb-208 

      Clark, HL; Lui, YW; Youngblood, David H. (American Physical Society, 2001)
      Strength functions for isoscalar dipole excitations in Zr-90, Sn-116, and Pb-208 have been measured with inelastic scattering of 240 MeV alpha particles at small angles. The isoscalar E1 strength distribution in each nucleus ...

    • Isoscalar giant resonances for nuclei with mass between 56 and 60 

      Lui, YW; Youngblood, David H.; Clark, HL; Tokimoto, Y.; John, B. (American Physical Society, 2006)
      The giant resonance region from 10 MeV < E-x < 62 MeV in Fe-56, Ni-58, and Ni-60 has been studied with inelastic scattering of 240 MeV alpha particles at small angles, including 0 degrees. Most of the expected isoscalar ...

    • Laser-excited acoustic oscillations in silver and bismuth nanowires 

      Jerebtsov, Sergey N.; Kolomenskii, Alexandre A.; Liu, Haidong; Zhang, Hong; Ye, Zuxin; Luo, Zhiping; Wu, Wenhao; Paulus, Gerhard G.; Schuessler, Hans A. (American Physical Society, 2007)
      Coherent acoustic oscillations in Bi and Ag nanowire samples were studied with a femtosecond pump-probe technique and detection of the scattered light. The observed optical and acoustic properties reflect the nanostructure ...

    • Magnetization relaxation in (Ga,Mn)As ferromagnetic semiconductors 

      Sinova, Jairo; Jungwirth, T.; Liu, X.; Sasaki, Y.; Furdyna, JK; Atkinson, WA; MacDonald, AH. (American Physical Society, 2004)
      We describe a theory of Mn local-moment magnetization relaxation due to p-d kinetic-exchange coupling with the itinerant-spin subsystem in the ferromagnetic semiconductor (Ga,Mn)As alloy. The theoretical Gilbert damping ...