Fortune, H Terry

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  • Publication
    Properties of 3.89/3.96-MeV states in 11Be
    (2012-09-18) Fortune, H Terry
    I have reanalyzed previous data from the 9Be(t,p) reaction to extract energies and widths for the two states near 3.9 MeV. Results are energies of 3889.27 ± 1.03 and 3954.53 ± 1.16 and widths of 3.2(8) and 7.9(7), all in keV, for the 5/2− and 3/2− states, respectively.
  • Publication
    Constraints on energies of 15F(g.s.), 15O(1/2+ , T = 3/2 ), and 16F(0+, T = 2)
    (2006-11-22) Fortune, H. Terry
    Coulomb energy calculations for the lowest 0+ , T = 2 state in A = 16 nuclei allow tight constraints on the masses of the lowest 1/2+ , T = 3/2 state in 15O and 15F, and of the 0+ , T = 2 state in 16F.
  • Publication
    Lowest 2+, T = 2 States in 20Mg and 20F
    (2012-05-03) Fortune, H Terry; Sherr, Rubby; Brown, B A
    A recent experiment located the lowest 2+ state in 20Mg and discovered that the corresponding 2+, T = 2 state in 20F does not fit expectations of the isobaric multiplet mass equation without a d term.We have calculated the energies of the ground and 2+ states in 20Mg and the 2+ in 20F in a potential model, using shell-model spectroscopic factors. We conclude that this important 20F state has likely never been observed, and suggest a reaction to find it.
  • Publication
    B(E2) Value and Configuration Mixing in 32Mg
    (2012-01-18) Fortune, H Terry
    I demonstrate that the B(E2) value in 32Mg can be understood with a model in which both the ground and 2+ first-excited states are predominantly of sd-shell character.
  • 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
    Consistent Description of 11Be and 12Be and of the 11Be(d,p)12Be Reaction
    (2012-05-22) Fortune, H Terry; Sherr, Rubby
    Simple wave functions for 11,12Be have been around for a long time. They have been tested against many independent processes involving (and properties of) these nuclei. All are consistent, except 11Be(d,p), where the discrepancy is a 4.7σ effect for the 2+ state and 15σ for the ground state. Here, we propose a resolution to this dilemma.
  • Publication
    Binding energy of ²²C
    (2012-02-09) Fortune, H Terry; Sherr, Rubby
    The sensitivity of the calculated matter radius to the binding energy is exploited to estimate the 2n binding energy of 22C, using a recent experimental value of Rm=5.4(9) fm. The result is B2n < 220 keV, significantly smaller than another recent estimate.
  • Publication
    Branching Ratio of 18Ne(7.06 MeV, 4+)
    (2012-12-13) Fortune, H Terry
    The recently reported branching ratio (BR) for the 4+ state in 18Ne at Ex = 7.06 MeV strongly disagrees with the BR computed using the known properties of this state.
  • Publication
    Update on alpha-particle and Nucleon Widths in 19F and 19Ne
    (2010-01-01) Fortune, H. Terry; Lacaze, A G; Sherr, Rubby
    This short article concerns α-particle and/or nucleon widths for several states in 19F and 19Ne. It addresses questions arising from new experiments or calculations. Many of the states involved are of interest in connection with reaction-rate calculations in astrophysics. For each state, or set of states, we discuss the new information in the context of what was previously known. Our recent article concerned states above 6.5 MeV in 19F. Except for one of those states, the present article primarily involves only states below 6.5 MeV. Unless otherwise noted, our energies and Jπ values are from the latest compilation.
  • Publication
    Excited states of 19Mg
    (2013-01-15) Fortune, H Terry; Sherr, R.
    We have calculated energies of the first two excited states of 19Mg by using a model that was previously successful for the ground state. Computed excitation energies are 1.12 and 1.54 MeV for (3/2−) and (5/2−), respectively—somewhat in disagreement with values of 1.38 and 2.14 MeV from a recent experiment.