Browsing by Author "Weller, HR"
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Item Open Access Compton scattering from 4He at 61 MeV(PRC, 2017-11-27) Sikora, MH; Ahmed, MW; Banu, A; Bartram, C; Crowe, B; Downie, EJ; Feldman, G; Gao, H; Grießhammer, HW; Hao, H; Howell, CR; Karwowski, HJ; Kendellen, DP; Kovash, MA; Li, X; Markoff, DM; Mikhailov, S; Popov, V; Pywell, RE; Silano, JA; Spraker, MC; Wallace, P; Weller, HR; Whisnant, CS; Wu, YK; Xiong, W; Yan, X; Zhao, ZWItem Open Access Compton scattering from 4He at the TUNL HIγS facility(PRC, 2020-03-30) Li, X; Ahmed, MW; Banu, A; Bartram, C; Crowe, B; Downie, EJ; Emamian, M; Feldman, G; Gao, H; Godagama, D; Grießhammer, HW; Howell, CR; Karwowski, HJ; Kendellen, DP; Kovash, MA; Leung, KKH; Markoff, D; Mikhailov, S; Pywell, RE; Sikora, MH; Silano, JA; Sosa, RS; Spraker, MC; Swift, G; Wallace, P; Weller, HR; Whisnant, CS; Wu, YK; Zhao, ZWItem Open Access Compton scattering from He 4 at the TUNL HIγ S facility(Physical Review C, 2020-03-01) Li, X; Ahmed, MW; Banu, A; Bartram, C; Crowe, B; Downie, EJ; Emamian, M; Feldman, G; Gao, H; Godagama, D; Grießhammer, HW; Howell, CR; Karwowski, HJ; Kendellen, DP; Kovash, MA; Leung, KKH; Markoff, D; Mikhailov, S; Pywell, RE; Sikora, MH; Silano, JA; Sosa, RS; Spraker, MC; Swift, G; Wallace, P; Weller, HR; Whisnant, CS; Wu, YK; Zhao, ZW© 2020 American Physical Society. Differential cross sections for elastic Compton scattering from He4 have been measured with high statistical precision at the High Intensity γ-ray Source at laboratory scattering angles of 55°, 90°, and 125° using a quasi-monoenergetic photon beam with a weighted mean energy value of 81.3 MeV. The results are compared to previous measurements and similar fore-aft asymmetry in the angular distribution of the differential cross sections is observed. This experimental work is expected to strongly motivate the development of effective-field-theory calculations of Compton scattering from He4 to fully interpret the data.Item Open Access Parity assignments in 172,174Yb using polarized photons and the K quantum number in rare earth nuclei(Physical Review C - Nuclear Physics, 2005-03-01) Savran, D; Muller, S; Zilges, A; Babilon, M; Ahmed, MW; Kelley, JH; Tonchev, A; Tornow, kW; Weller, HR; Pietralla, N; Li, J; Pinayev, IV; Wu, YKThe 100% polarized photon beam at the high intensity γ ray source (HIγS) at Duke University has been used to determine the parity of six dipole excitations between 2.9 and 3.6 MeV in the deformed nuclei 172,174Yb in photon scattering (γ →, γ′) experiments. The measured parities are compared with previous assignments based on the K quantum number that had been assigned in nuclear resonance fluorescence (NRF) experiments by using the Alaga rules. A systematic survey of the relation between γ-decay branching ratios and parity quantum numbers is given for the rare earth nuclei. © 2005 The American Physical Society.