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Title: High spin spectroscopic studies of 156Ho : shape changes and band termination
Author: Hampson, Peter
ISNI:       0000 0004 5363 287X
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2014
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High spin states in 156Ho have been populated through the 124Sn( 37 Cl, 5n)156Ho reaction at 177MeV as part of an experiment performed at the ATLAS facility of Argonne National Laboratory. A high statistics, high-fold γ-ray coincidence data set was collected with the GAMMASPHERE spectrometer array. Following a coincidence analysis 138 new transitions have been observed alongside a further 14 tentative transitions. A level scheme has been constructed building on previous work, which has been revised and considerably extended. A review of cranked shell model calculations, rotational alignments and B(M1)/B(E2) ratios of reduced transition probabilities has indicated that this nucleus is considerably soft with respect to triaxial deformation, which has facilitated in a reinterpretation of the configurations of four of the known bands. A further four new band structures have been identified, three of which exhibit behaviour characteristic of terminating bands. Within these structures two terminating states have been identified and valence-space interpretations have been associated with them that are consistent with known terminating bands in neighbouring nuclei. A third terminating configuration has been proposed but a corresponding terminating state has not yet been observed. An unusual backbend has been identified in a revised band structure. Following a review of nearby odd-odd nuclei it has been found that this behaviour may be systematic for odd-odd nuclei in the mass ∼160 region, however as of yet it defies a clear explanation, and therefore two possible interpretations have been presented.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QC Physics