Fortune, H Terry
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Publication 0+ cross-section ratio in 12Be( p,t)10Be(2013-05-02) Fortune, H TerryUsing 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 B(E2) Values in 12Be and Core Excitation(2012-04-11) Fortune, H TerryI have examined the B(E2)’s in 12Be connecting the first 2+ state to the first two 0+ states. I find that they can be understood in the simple model that has been successful for a variety of other observables in this nucleus, but only if the 2+ state has an excited-core component.Publication Comment on ‘‘Predicting Narrow States in the Spectrum of a Nucleus beyond the Proton Drip Line’’(2007-08-27) Fortune, H Terry; Sherr, RubbyPublication Binding energy of ²²C(2012-02-09) Fortune, H Terry; Sherr, RubbyThe 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 Widths in 15C and 15F(2011-02-22) Fortune, H TerryEarlier data for the reaction 13C(t,p) have been analyzed to extract widths for several states of 15C. Results affect predictions of widths in 15F.Publication Continuum three-body decays of 9Be(5/2−)(2013-01-07) Fortune, H Terry; Sherr, R.We describe and discuss various three-body decay mechanisms for 9Be(5/2−). We find that its decay to n+ 8Be(2+) is a small fraction of the total decay.Publication Excited 0+, T = 2 States in 12Be, 12C, and 12O(2006-08-01) Fortune, H. Terry; Sherr, RubbyWe present predictions of a relatively simple model of the low-lying 0+ states in 12Be, their predicted energy splitting in 12O, their cross-section ratios in 10Be(t,p) and 14C(p, t) and their decay widths. Comparison is made with predictions using earlier wave functions of Barker.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 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.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.