Neutron-proton pairing, Coulomb effects and shape coexistence in odd-odd N= Z 46V

• Published in: Physics Letters B
• Main Authors: O'Leary C.D., Bentley M.A., Appelbe D.E., Bark R.A., Cullen D.M., Ertürk S., Warner D.D.
• Other Authors: 0-Belirlenecek
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 1999
• Subjects: Gamma rays; High spin; Isospin; Neutron-proton pairing; Shell model; Antarctic; Canada; Antarc*; Scientific Committee on Antarctic Research
• Online Access: https://hdl.handle.net/11480/1425; https://doi.org/10.1016/S0370-2693(99)00656-5

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. Scientific Committee on Antarctic Research Engineering and Physical Sciences Research Council Komitet Badan Naukowych Natural Sciences and Engineering Research Council of Canada Engineering and Physical Sciences Research Council The authors thank both Alfredo Poves and Alex Brown for permission to use results from their shell model codes and for helpful discussions. We also thank those responsible for all aspects of the PEX collaboration. This work was supported by the United Kingdom Engineering and Physical Sciences Research Council (EPSRC) from whom D. E. Appelbe was in receipt of an EPSRC studentship. A. Maj is grateful to the Polish State Committee for Scientific Research for partial financial support (KBN Grant No. 2 P03B 001 16). This work was also supported by the Danish Natural Science Research Council.