Fast-Timing Study in the <sup>78</sup>Ni Region: β-Decay of <sup>81</sup>Zn

Paziy, V.; Mach, H.; Fraile, L. M.; Aprahamian, A.; Bernards, C.; Briz, J. A.; Bucher, B.; Chiara, C. J.; Dlouhý, Z.; Gheorghe, I.; Ghiţă, D.; Hoff, P.; Jolie, J.; Köster, U.; Kurcewicz, W.; Lică, R.; Mărginean, N.; Mărginean, R.; Régis, J.‐M.; Rudigier, M.; Sava, T.; Simpson, G. S.; Stănoiu, M.; Stroe, L.; Udı́as, J. M.; Walters, W. B.

doi:10.7566/jpscp.6.030009

Cited by 2 publications

(3 citation statements)

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“…A pair of 1p-2h intruder states based on two g 9 2 holes and an excited neutron gives levels with 1 2 + and 5 2 + spin-parity. We have measured the half-life of the 711 keV state in 81 Ge [62] and confirmed its intruder 5 2 + nature. The half-lives of the 895.5, 1724 and 1832 keV levels have been measured as well.…”

mentioning

confidence: 54%

“…The lifetime measurements will constrain the model parameters and serve to verify its predictions. In our measurement [58,59] we have significantly extended the available decay scheme and measured the half-life of the first excited state in 81 Ga to be T 60 10 1 2 = ( ) ps. This value indicates a l-forbidden M1 transition of 351 keV to the 5/2 -ground state that should happen between states based on the proton p 3 2 and f 5 2 configurations.…”

Section: Shell Evolution From N=40 To N=50mentioning

confidence: 99%

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Fast-timing spectroscopy at ISOLDE

Fraile

2017

J. Phys. G: Nucl. Part. Phys.

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View the article online for updates and enhancements. Related contentNuclear-structure studies of exotic nuclei with MINIBALL P A Butler, J Cederkall and P Reiter AbstractThe advanced time-delayed bgg(t) method has been used at ISOLDE since the relocation of the facility from the synchrocyclotron to the CERN proton synchrotron booster, a quarter of a century ago. The method was designed for precision measurements with low-intensity beams, achieving good efficiency and excellent time resolution with a compact setup. Over this time the technique has evolved to cope with the challenge of measuring lifetimes of complex level schemes of increasingly exotic nuclei populated in β decay. The ISOLDE facility provides unsurpassed opportunities to study many regions of the nuclide chart. The physics case encompasses topics of interest across the nuclide chart, including the evolution of shell structure around neutron shell and subshell closures such as N=20, N=40 and N=50, shape coexistence, and octupole correlations in heavy nuclei. The recently commissioned ISOLDE decay station provides enhanced capabilities that will be fully exploited with the increased beam intensities available at the upcoming HIE-ISOLDE facility.

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mentioning

confidence: 54%

Section: Shell Evolution From N=40 To N=50mentioning

confidence: 99%

Fast-timing spectroscopy at ISOLDE

Fraile

2017

J. Phys. G: Nucl. Part. Phys.

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“…[12] from β-delayed spectroscopy data, was thereafter ruled out [13]. A much more complete set of data is now available [14] and may allow us to answer this question. The evolution of the other neutron single-particle states in the 78 Ni natural valence space, ν2d 3/2 , ν1g 7/2 , and ν1h 11/2 , remains an open question.…”

Section: Introductionmentioning

confidence: 99%

Neutron effective single-particle energies above Ni78 : A hint from lifetime measurements in the N=51 isotones

Didierjean¹,

Verney²,

Duchêne³

et al. 2017

Phys. Rev. C

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Background: While the N = 50 shell-gap evolution towards 78 Ni is presently in the focus of nuclear structure research, experimental information on the neutron effective single-particle energy sequence above the 78 Ni core remain scarce. Direct nucleon-exchange reactions are indeed difficult with presently available post-accelerated radioactive-ion beams (especially for high orbital-momentum orbitals) in this exotic region. Purpose: In this study we probe the evolution of the ν1g 7/2 effective single-particle energy which is a key to understanding the possible evolution of the spin-orbit splitting due to the proton-neutron interaction in the 78 Ni region. To achieve this goal, a method based on lifetime measurements is used for the first time. The obtained lifetimes of the 7/2 + 1 states in 87 Kr and 85 Se are used to investigate the ν1g 7/2 evolution. Method: Yrast and near-yrast states in the light N = 51 isotones 85 Se and 87 Kr were populated via multinucleon transfer reactions, using a 82 Se beam and a 238 U target at the LNL tandem-ALPI facility. The prompt γ rays were detected by the AGATA Demonstrator and particle identification was performed using the PRISMA spectrometer. Lifetime measurements were performed by using the Cologne plunger device for deep inelastic reactions and the Recoil Distance Doppler Shift technique. Results: We obtain τ (7/2 + 1 ) = 0.4 +1.6 −0.4 ps for 87 Kr. In the case of 85 Se an upper limit of 3(2) ps is obtained for the τ 7/2 + 1 value. Conclusion: For 87 Kr, the measured (7/2 + 1 ) lifetime is consistent with a core-coupled 2 + ⊗ ν2d 5/2 configuration for this state. This result is consistent with that obtained by direct reaction, which validates our method. For 85 Se, the measured 7/2 + 1 lifetime limit indicates a very small contribution of the ν1g 7/2 configuration to the wave function of this state.

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Fast-Timing Study in the ⁷⁸Ni Region: β-Decay of ⁸¹Zn

Cited by 2 publications

References 9 publications

Fast-timing spectroscopy at ISOLDE

Fast-timing spectroscopy at ISOLDE

Neutron effective single-particle energies above Ni78 : A hint from lifetime measurements in the N=51 isotones

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Fast-Timing Study in the 78Ni Region: β-Decay of 81Zn

Cited by 2 publications

References 9 publications

Fast-timing spectroscopy at ISOLDE

Fast-timing spectroscopy at ISOLDE

Neutron effective single-particle energies above Ni78 : A hint from lifetime measurements in the N=51 isotones

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Fast-Timing Study in the ⁷⁸Ni Region: β-Decay of ⁸¹Zn