Convergence of the moments of inertia inf-p-gshell nuclei

Sl, Tabor

doi:10.1103/physrevc.45.242

Cited by 27 publications

(16 citation statements)

References 63 publications

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“…A similar behavior can be seen in the neighboring odd A isotopes whose moments of inertia also tend to saturate in the 20 to 25 5 /MeV range in agreement with a recent survey [21]. One difference is an alignment in the yrast band of sY at M -0.45 MeV which is presumably blocked by the odd neutron in s2Y.…”

Section: B Cranking Model Analysissupporting

confidence: 89%

Nuclear structure of odd-oddY82

et al. 1993

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Excited states in Y have been investigated via the Ni( Si, 3pn) Y and Fe( Si,p2n) Y reactions using beams provided by the Florida State University Tandem-LINAC with energies of 95 to 135 MeV. Particle-p coincidences with a full-sphere charged-particle detector and an excitation curve were used to assign p rays to Y. The Fe( Si,p2n) Y reaction at 95 MeV was used to measure p-p coincidences with five Compton-suppressed Ge detectors, Lifetimes in the ns and ps ranges were measured using direct timing and the Doppler-shift attenuation method. A level scheme with 39 states was constructed up to tentative spins and parities of (15 ) and (21+). In the positive-parity yrast band a phase reversal was observed in the signature splitting at I = 105. The B(M1) strengths in this band alternate with signature between about 0.1 and 1.0 p~. The B(E2) strengths of about 90 Weisskopf units are in good agreement with those predicted by Hartree-Fock-Bogolyubov calculations. Particle-rotor calculations indicate a prolate or triaxial core shape for the positive-parity band. PACS number(s):

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Section: B Cranking Model Analysissupporting

confidence: 89%

Nuclear structure of odd-oddY82

et al. 1993

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“…Overall, there is a considerable similarity between the isotones. In the n = +2 sequence, the J~~values tend to become more constant and to converge towards the rigid body value [18] above the first band crossing at Ku -0.55 MeV. This crossing has been interpreted as due to a go~2 proton alignment, leading to a vg9~2xg9&3 -quasiparticle (qp) configuration.…”

Section: Discussionmentioning

confidence: 91%

Shape changes inKr79

Döring

et al. 1994

Phys. Rev. C

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High-spin states in Kr were studied using the Cu( O,p3n) reaction at 65 MeV at the Florida State University Tandem-LINAC facility. Prompt p-p coincidences were observed using the Pitt-FSU detector array. Twelve new states were found, along with 19 new transitions. The yrast positive-and negative-parity bands were extended up to spins of (45/2+) and (31/2 ), respectively. Spin assignments were made based on directional correlation of oriented nuclei ratios whenever possible. A cranked-shell-model analysis shows some indication for a second band crossing in the positive-parity band at hu 0.75 MeV. This crossing, probably due to an aligned g9/Q neutron pair, occurs with a much larger band interaction than the Srst y9gq proton crossing. An increase in signature splitting above ho 0.75 MeV and a return of large alternations in the B(M1)/B(E2) ratio is consistent with the theoretically predicted return to a nearly oblate shape.PACS number(s): 23.20.Lv, 27.50.+e, 29.30.Kv

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“…Their yrast positive-parity bands are understood to be based on the g 9/2 g 9/2 two-quasiparticle (2-qp) configuration, leading to very similar observed behaviors such as moments of inertia converging toward the rigid rotor value at high spin [2], asymmetric energy splitting between the odd and even spin states (signature splitting), alternating B͑M1͒ strengths with spin, and a reversal in the phase of the normalized energy differences between adjacent states. For the most part, many of these behaviors can be explained from a theoretical standpoint (see Refs.…”

Section: Introductionmentioning

confidence: 99%

Collective excitations and shape changes inY80

et al. 2004

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Lifetimes of 30 high-spin levels in 80 Y were measured using the Doppler-shift attenuation method. The high-spin states were populated using the 54 Fe͑ 28 Si, pn͒ reaction at 90 MeV, with a thick 14 mg/ cm 2 54 Fe target used to stop all recoils. Prompt ␥ -␥ coincidences were detected using a Compton-suppressed Ge array consisting of three Clover detectors and seven single-crystal detectors. Lifetimes were determined from experimental line shapes measured at both 35°and 145°whenever possible. Transition quadrupole moments Q t inferred from the lifetimes in the lowest positive-and negative-parity bands are large ͑Ͼ3 eb͒ at low spin, but show a rather abrupt decrease at high spin. Results of calculations using the projected shell and cranked Woods-Saxon models in conjunction with the cranked-shell model suggest that these drops in Q t are due to quasiparticle alignment, which introduce shape changes in each band from nearly prolate below the alignment to triaxial above. Magnetic dipole transition strengths B͑M1͒ in the yrast positive-parity band show a strong alternating pattern with spin, similar to that observed in other neighboring odd-odd nuclei.

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Convergence of the moments of inertia inf-p-gshell nuclei

Cited by 27 publications

References 63 publications

Nuclear structure of odd-oddY82

Nuclear structure of odd-oddY82

Shape changes inKr79

Collective excitations and shape changes inY80

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