Multi-quasiparticle isomers and rotational bands in 178W

Purry, C.S.; Walker, P. M.; Dracoulis, George; Kibédi, T.; Kondev, F. G.; Bayer, S.; Bruce, Alison; Byrne, A.P.; Gelletly, W.; Regan, P. H.; Thwaites, C.; Burglin, O.; Rowley, N.

doi:10.1016/s0375-9474(97)00654-4

Cited by 60 publications

(35 citation statements)

References 32 publications

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“…Figure 2 g R obtained in this work as a function of the number of qps N p , N n , in comparison with model calculations [4], [11], [12].…”

Section: Discussionmentioning

confidence: 82%

“…Several models have been used to provide values of the pairing gaps for calculation of the MoI for high-K isomers in Hf, Ta and W isotopes, e.g blocked BCS [4] and Lipkin-Nogami [11,12]. Using p,n obtained from these analyses and the expression…”

Section: Discussionmentioning

confidence: 99%

“…Thus to date, although the valuable physics information contained in the parameter g R has been recognized, in the field of high K-isomers no systematic investigation has been made (see e.g. [3], [4] and, in particular, [5]). …”

Section: (3)mentioning

confidence: 99%

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Pairing and Blocking in High-K Isomers: Variation of the Collective Parameter g_R

Stone

2013

EPJ Web of Conferences

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Abstract. Using the principle of additivity, the quasi-particle contribution to magnetism in high-K isomers of Lu -Re has been estimated. Based on these estimates band structure branching ratio data is used to explore the behavior of the collective contribution as the number and neutron/proton nature (N p , N n ), of the quasi-particle excitations, change. A striking systematic variation of the collective g-factor g R with the difference, N p -N n , is revealed. Basic ideas of pairing, its quenching by quasi-particle excitation and the consequent changes to moment of inertia and collective magnetism are discussed. The new found systematic behaviour of g R opens a fresh window on these effects amenable to detailed theoretical investigation.

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“…Figure 2 g R obtained in this work as a function of the number of qps N p , N n , in comparison with model calculations [4], [11], [12].…”

Section: Discussionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

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Pairing and Blocking in High-K Isomers: Variation of the Collective Parameter g_R

Stone

2013

EPJ Web of Conferences

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“…At least part of the remaining discrepancies can be attributed to the assumption of fixed g R = 0.30. As observed for multiquasiparticle bands in, for example, 178 W [21] and 179 W [19], there is evidence that the neutron-proton balance in the configuration has a significant influence on g R . The effect was quantified for the more extensive 178 W data set [21], but it is not accounted for in the present work.…”

Section: M1 or E2mentioning

confidence: 73%

“…The interaction matrix element V is evaluated with the usual two-band-mixing approach (see, for example, Ref. [21]) making use of the in-band/out-of-band B(E2) ratios. The intrinsic (unperturbed) transition matrix elements are taken from the rotational model.…”

Section: A Band Crossingsmentioning

confidence: 99%

High-Kstates in the odd-odd nuclideRe180

et al. 2005

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The structure of the deformed, doubly odd nuclide 180 Re has been studied by γ -ray and conversion-electron spectroscopy using the 174 Yb( 11 B,5n) reaction with a pulsed 71 MeV beam of 11 B ions. Several of the previously known intrinsic states have been given revised spin and parity assignments. Rotational bands are observed with K π = (4 + ), (5 − ), (7 + ), 8 + , 9 − , 13 + , 14 − , 15 − , 16 + , 21 − , and (22 + ). Among these, a four-quasiparticle t band is identified, which is already energetically favored at its bandhead compared to the corresponding two-quasiparticle band; and two six-quasiparticle bands are identified and associated with a τ = 13 µs isomer. The observed structures, including g factors and alignments, are interpreted with the aid of Nilsson-plus-BCS calculations and configuration-constrained potential energy surface calculations. Reduced-hindrance values are obtained for K-forbidden transitions, illustrating the important role of the K quantum number for near-yrast isomers.

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High Spin Properties of Atomic Nuclei

Ward

Fallon

2001

Advances in the Physics of Particles and Nuclei

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Multi-quasiparticle isomers and rotational bands in 178W

Cited by 60 publications

References 32 publications

Pairing and Blocking in High-K Isomers: Variation of the Collective Parameter g_R

Pairing and Blocking in High-K Isomers: Variation of the Collective Parameter g_R

High-Kstates in the odd-odd nuclideRe180

High Spin Properties of Atomic Nuclei

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Multi-quasiparticle isomers and rotational bands in 178W

Cited by 60 publications

References 32 publications

Pairing and Blocking in High-K Isomers: Variation of the Collective Parameter gR

Pairing and Blocking in High-K Isomers: Variation of the Collective Parameter gR

High-Kstates in the odd-odd nuclideRe180

High Spin Properties of Atomic Nuclei

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Product

Resources

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Pairing and Blocking in High-K Isomers: Variation of the Collective Parameter g_R

Pairing and Blocking in High-K Isomers: Variation of the Collective Parameter g_R