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    Gamma-ray spectroscopy of high spin states near N = Z in the f7/2 shell
    (Jagellonian University, 1999) Bentley M.A.; O'Leary C.D.; Appelbe D.E.; Bark R.A.; Cullen D.M.; Ertürk S.; Warner D.D.
    Two pairs of mirror-nuclei, 2549Mn/2449Cr and 2447Cr/2347V, and the odd-odd N = Z nucleus 2346V have been studied up to the f7/2-shell band termination states. Differences in energy between isobaric analogue states in these nuclei have been measured and interpreted in terms of Coulomb effects. Through this work, we have shown that Coulomb energies are extremely sensitive to nuclear effects such as particle alignments, band terminations and shape changes. This has allowed us to investigate the extent to which the Coulomb energy can be used as a probe of the nuclear structure.
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    Neutron-proton pairing, Coulomb effects and shape coexistence in odd-odd N= Z 46V
    (Elsevier, 1999) O'Leary C.D.; Bentley M.A.; Appelbe D.E.; Bark R.A.; Cullen D.M.; Ertürk S.; Warner D.D.
    High-spin states up to the f7/2-shell band termination at J? = 15+ have been observed in the odd-odd N = Z = 23 nucleus V. A revised and significantly extended level scheme contains two distinct structures corresponding to spherical and prolate shapes. A band exhibiting rotational-like behaviour in the latter structure has excellent correspondence with the yrast sequence in Ti and is therefore assumed to be a T = 1 configuration. The difference between excited analogue states in the two nuclei is interpreted as a Coulomb effect and its variation with spin associated with np-pair alignment effects in V. Shell-model calculations have been performed and are in good quantitative agreement with experimental level energies. The competition between T = 1 and T = 0 structures is also reproduced. © 1999 Elsevier Science B.V. All rights reserved.
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    Nonyrast high-spin states in N=Z 44Ti
    (American Physical Society, 2000) O'Leary C.D.; Bentley M.A.; Brown B.A.; Appelbe D.E.; Bark R.A.; Cullen D.M.; Merchant A.C.
    High-spin states have been investigated in the N-Z=22 nucleus 44Ti. A newly observed set of states with J?=6+ , 8 + , 10+ , and 12+ are assigned to be members of a band built upon an excited 0+ state. This band displays rotational-like level spacings, with a near-linear J(J+1) dependence. A third set of J?=8+ , 10+ , and 12+ states have also been tentatively assigned and a negative-parity intruder band has been extended to J? =13-. Comparisons with df-shell model calculations show a good agreement for both energy levels and branching ratios. These calculations indicate that the excited 0+ band is dominated by a mixture of 8p-4h and 6p-2h configurations relative to 40Ca.