Nuclear Data Sheets for A = 163

Singh, Balraj; Farhan, A. R.

doi:10.1016/j.nds.2010.04.001

Cited by 52 publications

(21 citation statements)

References 249 publications

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“…The internal conversion coefficients and intensity balances (see Table I) for the proposed level scheme imply an E1 multipolarity for the 147 keV transiton (α(E1:147 keV) = 0.1067) and an M1 decay for the 53 keV transition (α(M1:53 keV) = 13. From the reported systematics of lighter, prolate-deformed odd-A Tb isotopes, 161 Tb and 163 Tb [4,5], the likely ground state spin/parities for 165,7 Tb are I π = …”

Section: Experimental Details and Resultsmentioning

confidence: 99%

“…The terbium isotopes (Z = 65) correspond to a single proton-hole in the 170 Dy deformed core [3] and, therefore, their structure can be used to probe the evolution of competing, prolate-deformed single-particle structures in this region of the Segré chart. Prior to this work, 163 Tb was the heaviest isotope of this element for which excited state information had been reported [4] and the systematics of the lighter odd-A Tb isotopes 161,163 Tb are consistent with ground states built on the same [1,2,4,5]. Here, we report on the decay of isomeric states in the neutron-rich systems 165 Tb and 167 Tb, and compare the deduced level schemes with long-standing predictions of which quasi-proton orbitals are favoured in this well-deformed region of the nuclear chart.…”

Section: Introductionmentioning

confidence: 99%

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Isomer Spectroscopy of Neutron-rich $^{165,167}$Tb

et al. 2017

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(601) 602 L.A. Gurgi et al.We present information on the excited states in the prolate-deformed, neutron-rich nuclei 165,167 Tb 100,102 . The nuclei of interest were synthesised following in-flight fission of a 345 MeV per nucleon 238 U primary beam on a 2 mm 9 Be target at the Radioactive Ion-Beam Factory (RIBF), RIKEN, Japan. The exotic nuclei were separated and identified event-by-event using the BigRIPS separator, with discrete energy gamma-ray decays from isomeric states with half-lives in the µs regime measured using the EURICA gamma-ray spectrometer.

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Section: Experimental Details and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Isomer Spectroscopy of Neutron-rich $^{165,167}$Tb

et al. 2017

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“…Within the approximation of adopting the same orbitals for both atoms (φ i ≈ ψ i ) these energies are simply given by the orbital energies j of the captured electron, E j = j in equation (17).…”

Section: Electron Capture Of 163 Homentioning

confidence: 99%

“…The half-life of 163 Ho is T 1/2 = 4570 ± 50 y [17,18]. According to the last release of the Atomic-Mass Evaluation by Audi et al [19], the recommended value for the energy available to the decay of 163 Ho is Q EC = 2.555 ± 0.016 keV obtained by combining several measurements whose results actually span over a larger range, from Q EC = 2.3 ± 1 keV [20] to Q EC 2.8 keV [21,22].…”

Section: Introductionmentioning

confidence: 99%

The electron capture in 163Ho experiment – ECHo

Gastaldo

Blaum

Chrysalidis

et al. 2017

Eur. Phys. J. Spec. Top.

136

110

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Abstract. Neutrinos, and in particular their tiny but non-vanishing masses, can be considered one of the doors towards physics beyond the Standard Model. Precision measurements of the kinematics of weak interactions, in particular of the 3 H β-decay and the 163 Ho electron capture (EC), represent the only model independent approach to determine the absolute scale of neutrino masses. The electron capture in 163 Ho experiment, ECHo, is designed to reach sub-eV sensitivity on the electron neutrino mass by means of the analysis of the calorimetrically measured electron capture spectrum of the nuclide 163 Ho. The maximum energy available for this decay, about 2.8 keV, constrains the type of detectors that can be used. Arrays of low temperature metallic magnetic calorimeters (MMCs) are being developed to measure the 163 Ho EC spectrum with energy resolution below 3 eV FWHM and with a time resolution below 1 μs. To achieve the sub-eV sensitivity on the electron neutrino mass, together with the detector optimization, the availability of large ultra-pure 163 Ho samples, the identification and suppression of background sources as well as the precise parametrization of the 163 Ho EC spectrum are of utmost importance. The high-energy resolution 163 Ho spectra measured with the first MMC prototypes with ion-implanted 163 Ho set the basis for the ECHo experiment. We describe the conceptual design of ECHo and motivate the strategies we have adopted to carry on the present medium scale experiment, ECHo-1K. In this experiment, the use of 1 kBq 163 Ho will allow to reach a neutrino mass sensitivity below 10 eV/c 2 . We then discuss how the results being achieved in ECHo-1k will guide the design of the next stage of the ECHo experiment, ECHo-1M, where a source of the order of 1 MBq 163 Ho embedded in large MMCs arrays will allow to reach sub-eV sensitivity on the electron neutrino mass.

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“…A finite neutrino mass m ν causes a deformation of the energy spectrum which is truncated at Q EC -m ν . The sensitivity of this approach depends on the nearness of Q EC to the binding energy of one of the captured electrons: 163 Ho was proposed in [3] as an ideal isotope with a Q EC between 2.5 keV and 3.0 keV -with 2.55 keV as raccomended value [4],-close to the binding energy of about 2.0 keV for the M1 electrons. Recent measurements [5] established that Q EC is 2833 ± 30 stat ± 15 sys eV, therefore not as close to the M1 shell binding energy as initially hoped for.…”

Section: Introductionmentioning

confidence: 99%