Fortune, H Terry

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Now showing 1 - 10 of 35
  • Publication
    0+ cross-section ratio in 12Be( p,t)10Be
    (2013-05-02) Fortune, H Terry
    Using the well-established wave function of 12Be(g.s.), I have estimated the cross-section ratio for the reaction 12Be(p,t) populating the ground-state and first excited 0+ state of 10Be. I find that the excited-state to ground-state ratio is small for any reasonable value of configuration mixing in 10Be.
  • Publication
    Unraveling the structure of 13Be
    (2013-01-07) Fortune, H Terry
    Using a simple model for low-lying positive-parity resonances in 13Be as 10Be x (sd)3 and 12Be1p x (sd), I find that the lowest 5/2+ state is predominantly (sd)3. I give predictions for several additional states.
  • Publication
    Widths and Spectroscopic Factors in ²¹O
    (2012-02-14) Fortune, H Terry; Sherr, Rubby
    A recent 20O(d,p)21O experiment, in reverse kinematics, discovered two new states in 21O at 4.77(10) and 6.17(11) MeV, with Jπ assignments of 3/2+ and of 3/2+ or 7/2−, respectively. Both widths and spectroscopic factors were reported, along with the branching ratio for the upper state to decay to the 2+ state of 20O. We have computed single-particle widths for all the relevant decays and have used them to extract additional information for these two states, including the spectroscopic factors for 2+ decay of the upper state with the two possible Jπ values. Our analysis prefers 7/2− for Jπ.
  • Publication
    Coulomb Energies in 16Ne and Low-lying levels of 17Na
    (2010-08-23) Fortune, H Terry; Sherr, Rubby
    We have computed energies of 16Ne levels in a core plus two-nucleon space, using known 16C energies and existing wave functions. We have then used these energies to compute properties of the first three levels of 17Na. Significant differences are found with results of a recent microscopic-cluster-model formulation.
  • Publication
    Predictions for the first two positive-parity states of 13F
    (2012-09-04) Fortune, H Terry; Sherr, R.
    We have used a potential model, together with information from 13Be, to compute expected energies and widths for the first two positive-parity states of 13F. Results are (all in MeV) Ep = 2.30 and 4.94 (or 5.26), width ∼0.6 and 0.3 (or 0.4), for 1/2+ and 5/2+, respectively.
  • Publication
    Energy and Width of 11B(1/2+, T = 3/2)
    (2006-09-26) Fortune, H. Terry
    I find that data for the reaction 10Be(p, γ) can be reasonably well described with a 1/2+ resonance whose width is 640 keV, rather than the accepted 210 keV.
  • Publication
    Two-Neutron Transfer in the “Island of Inversion”
    (2012-06-22) Fortune, H Terry
    Cross sections for (p,t) and (t ,p) reactions near neutron-shell closures depend sensitively on the amount of intruder configuration in the relevant states. For several nuclei in the “island of inversion,” I present calculated cross section ratios for the first two 0+ states as functions of the intruder-normal-state mixing.
  • Publication
    α Width of 18Ne(6.15 MeV, 1–)
    (2012-05-18) Fortune, H Terry
    Data for the 14C(6Li,d)18O(6.20) reaction, at 20 MeV, provides an α spectroscopic factor of 0.23 for this 1– state. Assuming equal spectroscopic factors for mirror states, the computed α width for 18Ne(6.15) is 3.9(1.0) eV.
  • Publication
    Intruder–normal-state mixing in 30Mg
    (2012-08-08) Fortune, H Terry
    In 30Mg, existing data for B(E2) strengths connecting the ground and excited 0+ states to the first 2+ state have been used, together with earlier shell-model predictions of normal and intruder E2 strengths, to estimate the intruder-normal state mixing in the 0+ and 2+ states. Resulting mixing is small, as expected, and for the ground state my value of 0.11(7) has a larger uncertainty, but is in quantitative agreement with the estimate of 0.0319(76) obtained earlier from the measured E0 strength connecting the 0+ states.
  • Publication
    Properties of the Lowest 1/2+, T = 3/2 States in A = 11 Nuclei
    (2012-04-04) Fortune, H Terry
    Analysis of energies and widths of the lowest 1/2+ T = 3/2 states in A = 11 nuclei suggests that the excitation energy in 11C should be about 200 keV below the energy in the literature, and the width should be 4 to 5 times the literature value. Properties of the state in 11B and 11N are in agreement with the present model.