Browsing by Subject "NUCLEI"

Now showing items 1-20 of 25

    • Astrophysical S factor for the radiative capture (12)N(p,gamma)(13)O determined from the (14)N((12)N,(13)O)(13)C proton transfer reaction 
      Banu, A.; Al-Abdullah, T.; Fu, C.; Gagliardi, Carl A.; McCleskey, M.; Mukhamedzhanov, A. M.; Tabacaru, G.; Trache, L.; Tribble, Robert E.; Zhai, Y.; Carstoiu, F.; Burjan, V.; Kroha, V. (American Physical Society, 2009)
      The cross section of the radiative proton capture reaction on the drip line nucleus (12)N was investigated using the asymptotic normalization coefficient (ANC) method. We have used the (14)N((12)N,(13)O)(13)C proton transfer ...
    • Asymptotic normalization coefficients for B-8 -> Be-7+p from a study of Li-8 -> Li-7+n 
      Trache, L.; Azhari, A.; Carstoiu, F.; Clark, HL; Gagliardi, Carl A.; Lui, YW; Mukhamedzhanov, AM; Tang, X.; Timofeyuk, N.; Tribble, Robert E. (American Physical Society, 2003)
      Asymptotic normalization coefficients (ANCs) for Li-8-->Li-7+n have been extracted from the neutron transfer reaction C-13(Li-7,Li-8)C-12 at 63 MeV. These are related to the ANCs in B-8-->Be-7 + p using charge symmetry. ...
    • ''Bare'' single-particle energies in Ni-56 
      Trache, L.; Kolomiets, A.; Shlomo, S.; Heyde, K.; Dejbakhsh, H.; Gagliardi, Carl A.; Tribble, Robert E.; Zhou, XG; Jacob, VE; Oros, AM. (American Physical Society, 1996)
      The structure of the low-lying levels in the mirror nuclei Ni-57 and Cu-57 is described within the extended unified model. The problem of single-particle energies in Ni-56 is treated in detail. ''Bare'' single-particle ...
    • Branching ratios for the beta decay of Na-21 
      Iacob, V. E.; Hardy, John C.; Gagliardi, Carl A.; Goodwin, J.; Nica, N.; Park, H. I.; Tabacaru, G.; Trache, L.; Tribble, Robert E.; Zhai, Y.; Towner, I. S. (American Physical Society, 2006)
      We have measured the beta-decay branching ratio for the transition from Na-21 to the first excited state of Ne-21. A recently published test of the standard model, which was based on a measurement of the beta-nu correlation ...
    • Compression mode resonances in Zr-90 
      Youngblood, David H.; Lui, YW; John, B.; Tokimoto, Y.; Clark, HL; Chen, X. (American Physical Society, 2004)
      The giant resonance region from 10 MeV < E-x < 55 MeV in Zr-90 has been studied with inelastic scattering of 240 MeV alpha particles at small angles including 0degrees. The isoscalar monopole resonance was found to contain ...
    • Correlated two-proton decay from (10)C 
      Mercurio, K.; Charity, R. J.; Shane, R.; Sobotka, L. G.; Elson, J. M.; Famiano, M.; Wuosmaa, A. H.; Banu, A.; Fu, C.; Trache, L.; Tribble, Robert E.; Mukhamedzhanov, A. M. (American Physical Society, 2008)
      The decay of (10)C excited states to the 2p + 2 alpha exit channel has been studied using inelastic excitation of a secondary (10)C beam. The decay sequences leading to the 2p + 2 alpha final state are determined for the ...
    • Determination of the astrophysical S factor for C-11(p,gamma)N-12 from the N-12 -> C-11+p asymptotic normalization coefficient 
      Tang, XD; Azhari, A.; Gagliardi, Carl A.; Mukhamedzhanov, AM; Pirlepesov, F.; Trache, L.; Tribble, Robert E.; Burjan, V.; Kroha, V.; Carstoiu, F. (American Physical Society, 2003)
      The evolution of very low-metallicity, massive stars depends critically on the amount of CNO nuclei that they produce. Alternative paths from the slow 3alpha process to produce CNO seed nuclei could change their fate. The ...
    • 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 ...
    • 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 precision branching ratio measurement for the superallowed beta decay of Rb-74: A prerequisite for exacting tests of the standard model 
      Piechaczek, A.; Zganjar, EF; Ball, GC; Bricault, P.; D'Auria, JM; Hardy, John C.; Hodgson, DF; Iacob, V.; Klages, P.; Kulp, WD; Leslie, JR; Lipoglavsek, M.; Macdonald, JA; Mak, HB; Moltz, D. M.; Savard, G.; von Schwarzenberg, J.; Svensson, CE; Towner, IS; Wood, JL. (American Physical Society, 2003)
      Nonanalog Fermi and Gamow-Teller branches in the superallowed beta decay of Rb-74 have been investigated using gamma-ray and conversion-electron spectroscopy. Nine observed transitions, in conjunction with a recent shell ...
    • High precision measurements of Na-26 beta(-) decay 
      Grinyer, GF; Svensson, CE; Andreoiu, C.; Andreyev, AN; Austin, RAE; Ball, GC; Chakrawarthy, RS; Finlay, P.; Garrett, PE; Hackman, G.; Hardy, John C.; Hyland, B.; Iacob, VE; Koopmans, KA; Kulp, WD; Leslie, JR; Macdonald, JA; Morton, AC; Ormand, WE; Osborne, CJ; Pearson, CJ; Phillips, AA; Sarazin, F.; Schumaker, MA; Scraggs, HC; Schwarzenberg, J.; Smith, MB; Valiente-Dobon, JJ; Waddington, JC; Wood, JL; Zganjar, EF. (American Physical Society, 2005)
      High-precision measurements of the half-life and beta-branching ratios for the beta(-) decay of Na-26 to Mg-26 have been measured in beta-counting and gamma-decay experiments, respectively. A 4 pi proportional counter and ...
    • 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 ...
    • Isospin-dependent properties of asymmetric nuclear matter in relativistic mean field models RID A-2398-2009 
      Chen, Lie-Wen; Ko, Che Ming; Li, Bao-An. (American Physical Society, 2007)
      Using various relativistic mean-field models, including nonlinear ones with meson field self-interactions, models with density-dependent meson-nucleon couplings, and point-coupling models without meson fields, we have ...
    • Jet conversions in a quark-gluon plasma 
      Liu, W.; Ko, Che Ming; Zhang, B. W. (American Physical Society, 2007)
      Quark and gluon jets traversing through a quark-gluon plasma not only lose their energies but also can undergo flavor conversions. The conversion rates via the elastic q((q) over bar )g -> gq((q) over bar )and the inelastic ...
    • Measurement of the l-forbidden Gamow-Teller branch of K-37 
      Hagberg, E.; Towner, IS; Alexander, TK; Ball, GC; Forster, JS; Hardy, John C.; Hykawy, JG; Koslowsky, V. T.; Leslie, JR; Mak, HB; Neeson, I.; Savard, G. (American Physical Society, 1997)
    • The N-14(Be-7,B-8)C-13 reaction and the Be-7(p,gamma)B-8 S factor 
      Azhari, A.; Burjan, V.; Carstoiu, F.; Gagliardi, Carl A.; Kroha, V.; Mukhamedzhanov, AM; Tang, X.; Trache, L.; Tribble, Robert E. (American Physical Society, 1999)
      The N-14(Be-7,B-8)C-13 reaction was studied using an 85 MeV Be-7 radioactive beam. The asymptotic normalization coefficients for the virtual transitions Be-7+pB-8 were determined from the measured cross section. These ...
    • New astrophysical S factor for the (15)N(p,gamma)(16)O reaction via the asymptotic normalization coefficient (ANC) method 
      Mukhamedzhanov, A. M.; Bem, P.; Burjan, V.; Gagliardi, Carl A.; Goldberg, V. Z.; Hons, Z.; La Cognata, M.; Kroha, V.; Mrazek, J.; Novak, J.; Piskor, S.; Pizzone, R. G.; Plunkett, A.; Romano, S.; Simeckova, E.; Spitaleri, C.; Trache, L.; Tribble, Robert E.; Vesely, F.; Vincour, J. (American Physical Society, 2008)
      The (15)N(p,gamma)(16)O reaction provides a path from the CN cycle to the CNO bi-cycle and CNO tri-cycle. The measured astrophysical factor for this reaction is dominated by resonant capture through two strong J(pi) = 1(-) ...
    • Possibility to Determine the Astrophysical S-Factor for the Be-7(p,gamma)b-8 Radiative-Capture from Analysis of the Be-7(he-3,d)b-8 Reaction 
      Mukhamedzhanov, AM; Tribble, Robert E.; imofeyuk, N. K. (American Physical Society, 1995)
    • Precise half-life measurement of the superallowed beta(+) emitter (26)Si 
      Iacob, V. E.; Hardy, John C.; Banu, A.; Chen, L.; Golovko, V. V.; Goodwin, J.; Horvat, V.; Nica, N.; Park, H. I.; Trache, L.; Tribble, Robert E. (American Physical Society, 2010)
      We measured the half-life of the superallowed 0(+) -> 0(+) beta(+) emitter (26)Si to be 2245.3(7) ms. We used pure sources of (26)Si and employed a high-efficiency gas counter, whichwas sensitive to positrons from both ...