Shape coexistence effects and quasiparticle alignment in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>81</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Moore, E. F.; Cottle, P. D.; Gross, C. J.; Headly, D.M.; Hüttmeier, U. J.; Tabor, S. L.; Nazarewicz, W.

doi:10.1103/physrevc.38.696

Cited by 70 publications

(32 citation statements)

References 32 publications

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“…Based on the geometry of the array, if the gate γ G represents one or more stretched electric quadrupole (E2) transitions, then the DCO ratios for stretched E2 transitions as well as for ∆J = 0 transitions are expected to be approximately unity, while ∆J = 1 transitions yield ratios of about 0.5 if the mixing ratio δ is small [18]. Most DCO ratios were measured by gating on stretched E2 decays, while a few others were determined by gating on known E1 transitions assuming δ = 0.…”

Section: Experimental and Analysis Methodsmentioning

confidence: 99%

“…A comparison between the decay time of the recoiling nuclei and the slowing down in a thin target with a backing foil was carried out using the simulation code fits [18], which integrates over the thickness of the target with backing and accounts for evaporation of charged particles by determining a Gaussian distribution of recoil velocities (with a width that is 10% of the kinematic mean) at the time of decay. It corrects for direct feeding from up to four known higher-lying states and side feeding from one unknown state, as well as for finite detector solid angle and resolution, and the changing (energy-dependent) reaction cross sections due to the beam slowing down through the target and backing.…”

Section: Lifetime Measurementsmentioning

confidence: 99%

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Coexisting single-particle and collective excitations inAs70

et al. 2015

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High-spin states in 70 As were studied using the 55 Mn( 18 O,3n) fusion-evaporation reaction at a beam energy of 50 MeV. Prompt γ-γ coincidences were measured using the Florida State UniversityCompton-suppressed Ge array consisting of three Clover detectors and seven single-crystal detectors. A reinvestigation of the known level scheme resulted in the addition of 32 new transitions and the rearrangement of 10 others. The high-spin decay pattern of yrast negative-parity states was modified and enhanced extensively. Spins were assigned based on directional correlation of oriented nuclei ratios. Lifetimes of seven excited states were measured using the Doppler-shift attenuation method. The B(E2) rates inferred from the lifetimes of states in the yrast positive-parity band imply substantial collectivity, in agreement with the results of previous studies. Substantial signature splitting and large alternations in the B(M 1) strengths were observed in this band as well, supporting the interpretation of an aligned πg 9/2 ⊗ νg 9/2 intrinsic configuration for this structure beginning at the lowest 9 + state. Large-scale shell-model calculations performed for 70 As reproduce the relative energy differences between adjacent levels and the B(M 1) rates in the yrast positiveparity band rather well, but underestimate the B(E2) strengths. The g 9/2 orbital occupancies for the lowest 9 + state predicted by the shell-model calculations provide additional evidence of a stretched πg 9/2 ⊗ νg 9/2 configuration for this state.

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Section: Experimental and Analysis Methodsmentioning

confidence: 99%

Section: Lifetime Measurementsmentioning

confidence: 99%

Coexisting single-particle and collective excitations inAs70

et al. 2015

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“…As indicated in [14,15] [4] and 79Kr [17]. The * indicate that 6(E2/ M1) =0 was assumed rupole moments in the 1 qp and proton aligned 3qp bands.…”

Section: A the 7/2 + Bandmentioning

confidence: 96%

“…The three negative parity Nilsson orbits [303] 5/2, [301] 3/2 and [301] 1/2 form a complete subshell in the limit of pseudo-SU (3) symmetry and should be nearly degenerate in energy [4,17]. The [30113/2 Nilsson state is predicted to lie near 400 keV [14].…”

Section: D the 3/2-bandmentioning

confidence: 99%

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Rotational and single-particle structures in83Zr

Rudolph

Gross

Lieb

et al. 1991

Z. Physik A - Hadrons and Nuclei

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The band structure of 83Zr has been investigated using the Daresbury recoil separator and TESSA array with 20 Compton suppressed Ge detectors and the reaction 2SSi(SSNi, 2pn) at 195 MeV. DCO ratios have been used to make many new spin assignments. The three known rotational bands have been extended up to the onset of the five quasiparticle bands. On the basis of the 21/2 +, 23/2 + and 25/2 + yrast and yrare states, a (3qp) structure similar to those found in the isotones 79Kr and S~Sr has been identified. Additional bands have been observed for the first time, one of which appears to be non-collective. Strong mixing between the various negative parity bands is evident. A multiplet of states feeding the three quasiparticle region of the negative parity yrast band has been found. The data is interpreted in the framework of the cranked shell model.

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Nuclear Data Sheets for A = 81

Baglin

1996

Nuclear Data Sheets

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Shape coexistence effects and quasiparticle alignment inSr81

Cited by 70 publications

References 32 publications

Coexisting single-particle and collective excitations inAs70

Coexisting single-particle and collective excitations inAs70

Rotational and single-particle structures in83Zr

Nuclear Data Sheets for A = 81

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