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Öğe Deformed rotational cascades in 152Dy: Further evidence for shape coexistence at high spin(American Physical Society, 2000) Smith M.B.; Appelbe D.E.; Twin P.J.; Beausang C.W.; Beck F.A.; Bentley M.A.; Haas B.Two new rotational bands have been observed in the 152Dy nucleus following experiments performed using the EUROGAM ?-ray spectrometer. Several transitions have been observed that link these new bands into the known single-particle states. Using the Doppler shift attenuation method, the quadrupole moment of the previously-known rotational sequence has been measured. The value of Qband=3.85±0.06 e b confirms the deformed nature of this cascade. The structures of the three bands are discussed in terms of the occupation of both paired and unpaired orbitals, and are found to be in good agreement with theoretical calculations. The observation of two new bands further extends the concept of shape coexistence in the 152Dy nucleus.Öğe 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.Öğe 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.Öğe 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.
