Fortune, H Terry
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Publication Energy and Width of the Excited 0+ stat in 12O(2010-01-01) Fortune, H Terry; Sherr, RubbyWe review predictions for the energy of the excited 0+state of 12O and present new calculations of its width. Results are compared with those of a recent experiment.Publication Constraints on energies of 15F(g.s.), 15O(1/2+ , T = 3/2 ), and 16F(0+, T = 2)(2006-11-22) Fortune, H. TerryCoulomb 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 B(E2) Value and Configuration Mixing in 32Mg(2012-01-18) Fortune, H TerryI 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 Properties of 3.89/3.96-MeV states in 11Be(2012-09-18) Fortune, H TerryI 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 The Puzzle of 32Mg(2011-08-29) Fortune, H TerryIn the so-called island of inversion, for very neutron-rich nuclei, the N = 20 shell gap narrows appreciably, allowing the lowest (fp)2 configuration to compete with the normal sd-shell structure at low excitation. It is thought that this intruder could even dominate the ground state (gs) in some nuclei. Of course, this lowering of the fp shell into the low-excitation region is already well known for N ~ Z nuclei, but, perhaps not quite to the same extent. For example, in 38Ar, which has N = 20, the presence of three low-lying 0+ states in an excitation region where only one sd-shell 0+ exists has long been taken as evidence of excitations into the fp shall (see Ref. 1 and references therein). An important nucleus in this region is 32Mg, whose gs has been reported to possess several puzzling features. Here, we briefly review the history as it relates to 32Mg.Publication Structure of 2+, T = 2 States in A = 12 Nuclei(2011-04-21) Fortune, H. Terry; Sherr, RubbyUsing a reasonable but simple model, properties of 2+ states in 12Be and 12O are calculated and compared with results of experiments.Publication Unraveling the structure of 13Be(2013-01-07) Fortune, H TerryUsing 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, RubbyA 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, RubbyWe 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.