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- Rubinstein, Hector R., et al.
(author)
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Dependence of lattice hadron masses on external magnetic fields
- 1995
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In: Nuclear Physics B. - : Elsevier BV. - 0550-3213 .- 1873-1562. ; 457:3, s. 577-593
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Journal article (peer-reviewed)abstract
- We study the variation of the hadron masses in the presence of external magnetic fields of strength of the order of the masses themselves.We identify the main factors affecting the lattice simulation results:•- the boundary discontinuities for eB ⪡ 2π/L2a2.•- the SU(6) choice of the hadron wave function.We confirm qualitatively the earlier theoretical ansatz on the linear behaviour of the masses with the magnetic field and, as a by-product, we improve the lattice measurements of the nucleon magnetic moments.However our systematic and statistical errors preclude us from measuring the theoretically predicted field strength at which the proton becomes heavier than the neutron.
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- Rubinstein, Hector R., et al.
(author)
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Nucleon masses in strong magnetic fields
- 1995
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In: Nuclear physics B, Proceedings supplements. - : Elsevier BV. - 0920-5632 .- 1873-3832. ; 42:1-3, s. 358-360
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Journal article (peer-reviewed)abstract
- We compute the variation of the masses of the proton and the neutron induced by the presence of a strong external magnetic field. We discuss the choice of the wave function and different techniques how to apply the magnetic field. The results obtained from a 24·162·12 and a 162·82 lattice are compared with a phenomenological approach.
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- Sun, H., et al.
(author)
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New Band Structures and an Unpaired Crossing in 78Kr
- 1999
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In: Physical Review C (Nuclear Physics). - 0556-2813. ; 59:2, s. 655-664
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Journal article (peer-reviewed)abstract
- High-spin states in Kr-78 were studied using the Ni-58(Na-23,3p) reaction at 70 MeV and the Ni-58(Si-23,alpha 4p) reaction at 130 MeV. Prompt gamma-gamma coincidences were measured using the Pitt-FSU detector array and the GAMMASPHERE-MICROBALL array. Results from these experiments have led to 26 new excitation levels, some of which have been grouped into 3 new bands. Spins were assigned based on directional correlations of oriented nuclei. Two of the new negative-parity bands appear to form a signature-partner pair based on a two-quasineutron structure, in contrast to the previously known two-quasiproton negative-parity bands. A forking has been observed at the 24(+) state in the yrast band, which calculations suggest may result from an unpaired crossing. The available evidence suggests oblate shapes in the yrast band coexist with prolate shapes in the negative-parity bands. [S0556-2813(99)04602-6].
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