Nuclear Data Sheets for A=170

Baglin, Coral M.; McCutchan, E. A.; Basunia, S.; Browne, E.

doi:10.1016/j.nds.2018.11.001

Cited by 23 publications

(7 citation statements)

References 259 publications

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“…where N is the number of potentially α unstable nuclei, ε is the detection efficiency, η is the 84.3 keV gamma-ray emission intensity (equal to 13.7% [6]), t is the measurements time, and lim S is the number of events of the effect searched for which can be excluded at a given confidence level (C.L. ; in the present work all the half-life limits are given with 90% C.L.).…”

Section: Ge6mentioning

confidence: 99%

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First search for $$\alpha $$ decays of naturally occurring Hf nuclides with emission of $$\gamma $$ quanta

et al. 2020

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The first ever search for α decays to the first excited state in Yb was performed for six isotopes of hafnium (174, 176, 177, 178, 179, 180) using a high purity Hf-sample of natural isotopic abundance with a mass of 179.8 g. For 179 Hf, also α decay to the ground state of 175 Yb was searched for thanks to the β-instability of the daughter nuclide 175 Yb. The measurements were conducted using an ultra low-background HPGe-detector system located 225 m underground. After 75 d of data taking no decays were detected but lower bounds for the half-lives of the decays were derived on the level of lim T 1/2 ∼ 10 15 − 10 18 a. The decay with the shortest half-life based on theoretical calculation is the decay of 174 Hf to the first 2 + 84.3 keV excited level of 170 Yb. The experimental lower bound was found to be T 1/2 ≥ 3.3 × 10 15 a.

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Section: Ge6mentioning

confidence: 99%

“…The exposure in the experiments for the isotope 174 Hf was 0.0068 g×d [4] and 0.12 g×d [5], respectively. The half-life value obtained in [5] is accepted currently as the recommended half-life of 174 Hf [6]. Table 1: Characteristics of (potential) α decays of hafnium isotopes.…”

Section: Introductionmentioning

confidence: 99%

First search for $$\alpha $$ decays of naturally occurring Hf nuclides with emission of $$\gamma $$ quanta

et al. 2020

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“…11. Systematics of B(E 2) ↓ for Gd, Dy, Er, and Yb isotopes with 94 N 104; data taken from [22,33,[39][40][41][42][43][44][45][46]. The B(E 2) ↓ values for 164 Dy and 166 Dy calculated here are added as starred data points.…”

Section: Resultsmentioning

confidence: 99%

Half-life measurements in Dy164,166 using γ−γ fast-timing spectroscopy with the
Canavan¹,
Rudigier²,
Regan³
et al. 2020
Phys. Rev. C

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We report on the measurement of lifetimes of excited states in the near-mid-shell nuclei 164,166 Dy using the gamma-ray coincidence fast-timing method. The nuclei of interest were populated using reactions between an 18 O beam and a gold-backed isotopically enriched 164 Dy target of thickness 6.3 mg/cm 2 at primary beam energies of 71, 76, and 80 MeV from the IPN-Orsay laboratory, France. Excited states were populated in 164 Dy, 166 Dy, and 178,179 W following Coulomb excitation, inelastic nuclear scattering, two-neutron transfer, and fusionevaporation reaction channels respectively. Gamma rays from excited states were measured using the ν-Ball high-purity germanium (HPGe)-LaBr 3 hybrid γ-ray spectrometer with the excited state lifetimes extracted using the fast-timing coincidence method using HPGe-gated LaBr 3-LaBr 3 triple coincident events. The lifetime of the first I π = 2 + excited state in 166 Dy was used to determine the transition quadrupole deformation of this neutron-rich nucleus for the first time. The experimental methodology was validated by showing consistency with previously determined excited state lifetimes in 164 Dy. The half-lives of the yrast 2 + states in 164 Dy and 166 Dy were 2.35(6) and 2.3(2) ns, respectively, corresponding to transition quadrupole moment values of Q 0 = 7.58(9) and 7.5(4) eb, respectively. The lifetime of the yrast 2 + state in 166 Dy is consistent with a quenching of nuclear quadrupole deformation at β ≈ 0.35 as the N = 104 mid-shell is approached.

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“…At the present time it is very challenging, due to computation limitations, to reproduce such collective configurations even within the LSSM framework since they can only be generated by cross-major-shell excitations. The data are taken from [40] ( 168 Os), [41] ( 170 W), [42] ( 172 W), [42] ( 172 Os), [43] ( 174 W), [44] ( 174 Os), [45] ( 178 Pt)…”

Section: Discussionmentioning

confidence: 99%

Evidence for octupole collectivity in $$^{172}{\mathrm {Pt}}$$

Ertoprak

Cederwall

et al. 2020

Eur. Phys. J. A

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Excited states in the extremely neutron-deficient nucleus 172 Pt were populated via 96 Ru( 78 Kr, 2 p) and 92 Mo( 83 Kr, 3n) reactions. The level scheme has been extended up to an excitation energy of ≈ 5 MeV and tentative spin-parity assignments up to I π = 18 + . Linear polarization and angular distribution measurements were used to determine the electromagnetic E1 character of the dipole transitions connecting the positive-parity ground-state band with an excited side-band, firmly establishing it as a negativeparity band. The lowest member of this negative-parity structure was firmly assigned spin-parity 3 − . In addition, we observed an E3 transition from this 3 − state to the ground state, providing direct evidence for octupole collectivity in 172 Pt. Large-scale shell model (LSSM) and total Routhian surface (TRS) calculations have been performed, supporting the interpretation of the 3 − state as a collective octupolevibrational state. a

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Nuclear Data Sheets for A=170

Cited by 23 publications

References 259 publications

First search for $$\alpha $$ decays of naturally occurring Hf nuclides with emission of $$\gamma $$ quanta

First search for $$\alpha $$ decays of naturally occurring Hf nuclides with emission of $$\gamma $$ quanta

Half-life measurements in Dy164,166 using γ−γ fast-timing spectroscopy with the
Canavan¹,
Rudigier²,
Regan³
et al. 2020
Phys. Rev. C

Evidence for octupole collectivity in $$^{172}{\mathrm {Pt}}$$

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Nuclear Data Sheets for A=170

Cited by 23 publications

References 259 publications

First search for $$\alpha $$ decays of naturally occurring Hf nuclides with emission of $$\gamma $$ quanta

First search for $$\alpha $$ decays of naturally occurring Hf nuclides with emission of $$\gamma $$ quanta

Half-life measurements in Dy164,166 using γ−γ fast-timing spectroscopy with the Canavan1, Rudigier2, Regan3 et al. 2020Phys. Rev. C

Evidence for octupole collectivity in $$^{172}{\mathrm {Pt}}$$

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About

Half-life measurements in Dy164,166 using γ−γ fast-timing spectroscopy with the
Canavan¹,
Rudigier²,
Regan³
et al. 2020
Phys. Rev. C