Simultaneous deorientation and lifetime measurement in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>98</mml:mn></mml:msup></mml:math>Ru using the recoil distance Doppler shift method in inverse Coulomb excitation

Radeck, D.; Werner, V.; Ilie, G.; Cooper, Nathan; Anagnostatou, V.; Ahn, T.; Bettermann, L.; Casperson, R. J.; Chevrier, R.; Heinz, A.; Jolie, J.; McCarthy, D. R.; Smith, M. K.; Williams, E.

doi:10.1103/physrevc.85.014301

Cited by 24 publications

(9 citation statements)

References 41 publications

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“…[15], while for 98 Ru we took the data from Ref. [16], which establish a ratio B(E2, 4 + 1 → 2 + 1 )/B(E2, 2 + 1 → 0 + 1 ) = 1.86 (16) in agreement with the expectations for vibrators instead of taking data for which this ratio has anomalous values [10,59,60]. The lack of experimental data for 118 Te makes it impossible to perform χ 2 fit.…”

Section: Electromagnetic Moments -Comparison With Datamentioning

confidence: 93%

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Effective field theory for nuclear vibrations with quantified uncertainties

Pérez

Papenbrock

2015

Phys. Rev. C

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We develop an effective field theory (EFT) for nuclear vibrations. The key ingredientsquadrupole degrees of freedom, rotational invariance, and a breakdown scale around the threephonon level -are taken from data. The EFT is developed for spectra and electromagnetic moments and transitions. We employ tools from Bayesian statistics for the quantification of theoretical uncertainties. The EFT consistently describes spectra and electromagnetic transitions for 62 Ni, 98,100 Ru, 106,108 Pd, 110,112,114 Cd, and 118,120,122 Te within the theoretical uncertainties. This suggests that these nuclei can be viewed as anharmonic vibrators.

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Section: Electromagnetic Moments -Comparison With Datamentioning

confidence: 93%

“…At LO, the energy spectrum is that of a harmonic quadrupole oscillator, see Eq. (16), and the LEC ω has to be adjusted to data. For nuclear vibrations in the mass A ≈ 100 region, ω ≈ 0.6 MeV.…”

Section: B Uncertainty Quantification For Energy Levelsmentioning

confidence: 99%

Effective field theory for nuclear vibrations with quantified uncertainties

Pérez

Papenbrock

2015

Phys. Rev. C

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“…Only in case of noncollective nuclei at or near closed shells does one expect the above ratio to be less than unity. Very few cases of collective nuclei with anomalously low B 42 ratio have been identified in the literature [24], and some of them turned out to be due to flawed measurements [25,26].…”

Section: Introductionmentioning

confidence: 99%

Collective nature of low-lying excitations in70,72,74Zn from lifetime measurements using the AGATA spectrometer demonstrator

Louchart¹,

Obertelli²,

Görgen³

et al. 2013

Phys. Rev. C

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Background: Neutron-rich nuclei with protons in the fp shell show an onset of collectivity around N = 40. Spectroscopic information is required to understand the underlying mechanism and to determine the relevant terms of the nucleon-nucleon interaction that are responsible for the evolution of the shell structure in this mass region. Methods: We report on the lifetime measurement of the first 2 + and 4 + states in 70,72,74 Zn and the first 6 + state in 72 Zn using the recoil distance Doppler shift method. The experiment was carried out at the INFN Laboratory of Legnaro with the AGATA demonstrator, first phase of the Advanced Gamma Tracking Array of highly segmented, high-purity germanium detectors coupled to the PRISMA magnetic spectrometer. The excited states of the nuclei of interest were populated in the deep inelastic scattering of a 76 Ge beam impinging on a 238 U target. Results: The maximum of collectivity along the chain of Zn isotopes is observed for 72 Zn at N = 42. An unexpectedly long lifetime of 20 +1.8 −5.2 ps was measured for the 4 + state in 74 Zn. Conclusions: Our results lead to small values of the B(E2; 4 + 1 → 2 + 1 )/B(E2; 2 + 1 → 0 + 1 ) ratio for 72,74 Zn, suggesting a significant noncollective contribution to these excitations. These experimental results are not reproduced by state-of-the-art microscopic models and call for lifetime measurements beyond the first 2 + state in heavy zinc and nickel isotopes.

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“…As this simple sketch of the technique illustrates, there are two key detector properties that must be considered [3][4][5][6][7][8], Coulomb excitation [9,10,6]) will have to be considered. For decades, BaF 2 detectors were the standard for fasttiming measurements using gamma-gamma coincidences.…”

Section: Fast-timing Techniquesmentioning

confidence: 99%

High-precision excited state lifetime measurements in rare earth nuclei using LaBr₃(Ce) detectors

Williams

Cooper

Bonett-Matiz

et al. 2012

EPJ Web of Conferences

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Abstract. To study how collective nuclear structure evolves towards mid-shell and test next-generation LaBr 3 (Ce) scintillation detectors, measurements of the lifetimes of 2 + 1 states in 168 Hf and 174 W were conducted at the Wright Nuclear Structure Laboratory. Preliminary results indicate that the excellent time and energy resolution of LaBr 3 detectors make them well suited to fast timing measurements, allowing for improved background subtraction and peak resolution in comparison to BaF 2 detectors. Preliminary analysis shows an order of magnitude reduction in the statistical error of the 2 + lifetimes in comparison to literature values for both nuclei. In the case of 174 W, a substantial reduction of the observed lifetime hints at the possibility of new physics in the region.

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Simultaneous deorientation and lifetime measurement in98Ru using the recoil distance Doppler shift method in inverse Coulomb excitation

Cited by 24 publications

References 41 publications

Effective field theory for nuclear vibrations with quantified uncertainties

Effective field theory for nuclear vibrations with quantified uncertainties

Collective nature of low-lying excitations in70,72,74Zn from lifetime measurements using the AGATA spectrometer demonstrator

High-precision excited state lifetime measurements in rare earth nuclei using LaBr₃(Ce) detectors

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Simultaneous deorientation and lifetime measurement in98Ru using the recoil distance Doppler shift method in inverse Coulomb excitation

Cited by 24 publications

References 41 publications

Effective field theory for nuclear vibrations with quantified uncertainties

Effective field theory for nuclear vibrations with quantified uncertainties

Collective nature of low-lying excitations in70,72,74Zn from lifetime measurements using the AGATA spectrometer demonstrator

High-precision excited state lifetime measurements in rare earth nuclei using LaBr3(Ce) detectors

Contact Info

Product

Resources

About

High-precision excited state lifetime measurements in rare earth nuclei using LaBr₃(Ce) detectors