<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="bold">β</mml:mi></mml:math>decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mrow><mml:mn>71</mml:mn><mml:mo>,</mml:mo><mml:mn>73</mml:mn></mml:mrow></mml:msup></mml:math>Co: Probing single-particle states approaching doubly magic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>78</mml:mn></mml:msup><

Rajabali, M. M.; Grzywacz, R.; Liddick, S. N.; Mazzocchi, C.; Batchelder, J.C.; Baumann, T.; Bingham, C. R.; Darby, I. G.; Ginter, T. N.; Ilyushkin, S.; Karny, M.; Królas, W.; Mantica, P. F.; Miernik, K.; Pfützner, M.; Rykaczewski, K. P.; Weißhaar, D.; Winger, J. A.

doi:10.1103/physrevc.85.034326

Cited by 22 publications

(26 citation statements)

References 44 publications

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“…The half-life for 69 Co was previously determined for this dataset by Spyrou et al [43] to be 216(15) ms, which is in agreement with previous literature values [29,[49][50][51][52]. The extracted half-life for 71 Co was determined to be 86(10) ms, which is also in good agreement with literature values [32,39,53,54]. The expected γ rays were confirmed in the singles (segment) spectra and the level energies they originate from were confirmed in the TAS spectrum.…”

Section: Discussionsupporting

confidence: 89%

“…Furthermore, the P n values are expected to be small. For 69 Co no P n measurement exists [47] and for 71 Co it is of the order of <3%, though there are presently conflicting results in the literature [31,48]. With such low probabilities and the low efficiency for neutron detection in SuN, background from the β-delayed neutrons is unlikely to be observed.…”

Section: Discussionmentioning

confidence: 99%

“…The neutron-rich Ni isotopes, located along the Z = 28 shell closure and neighboring Cu and Co elements have been studied extensively to understand the interplay between simple single-particle excitations and collective behavior [28]. Both 69,71 Co β-decays into 69,71 Ni have been previously studied [29][30][31][32][33]. Evidence of multiple isomeric states in 69 Co was obtained based on the differences in the β-decaying feeding pattern from 69 Co produced either directly through fragmentation or as a daughter product from the decay of 69 Fe.…”

Section: Introductionmentioning

confidence: 99%

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Co69,71 β -decay strength distributions from total absorption spectroscopy

et al. 2019

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Background: The rapid neutron capture process is one of the main nucleosynthesis processes of elements heavier than Fe. Uncertainties in nuclear properties, such as masses, half-lives, and β-delayed neutron probabilities can cause orders of magnitude of variation within astrophysical r-process simulations. Presently, theoretical models are used to make global predictions of various nuclear properties for the thousands of nuclei required for these simulations, and measurements are required to benchmark these models, especially far from stability. Purpose: β-decay strength distributions can be used to not only inform astrophysical r-process simulations, but also to provide a stringent test for theoretical calculations. The aim of this work is to provide accurate strength distributions for 69,71 Co β decay. Method: The technique of total absorption spectroscopy was used to measure the β decay of 69,71 Co for the first time at the National Superconducting Cyclotron Laboratory. The ions were implanted in a double-sided silicon strip detector at the center of the Summing NaI(Tl) detector and identified using standard particle identification methods. The response of the detection system to the β-decay electron and subsequent γ-ray radiation was fit to the observed experimental data using a χ 2-minimization technique. Results: β-feeding intensities and Gamow-Teller strength distributions were extracted from the fits of the experimental data. The β-decay intensities show that there is a large percentage of feeding to levels above 2 MeV, which have not been observed in previous studies. The resultant β-feeding intensities and Gamow-Teller strength distributions were compared to shell model and quasiparticle random phase approximation (QRPA) calculations. Conclusions: Comparing experimentally determined β-decay strength distributions provides a test of models, which are commonly used for global β-decay properties for astrophysical calculations. This work highlights the importance of performing detailed comparisons of models to experimental data, particularly far from stability and as close to the r-process path as possible.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Co69,71 β -decay strength distributions from total absorption spectroscopy

et al. 2019

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“…This assignment was based on systematics with the neighboring 66 Co isotope, where a tentative (3 + ) ground state was proposed from the nonobservation of groundstate β feeding to 66 Ni [38,39]. The β-decaying (1/2 − ) levels found in 69 Ni [16,40] and 71 Ni [41][42][43] reinforce this assumption. However, the discovery of a low-energy β-decaying intruder state in 67 Co [44], interpreted as a proton-core excitation to the π = 1/2 − deformed shell of the p 3/2 orbital, opened up the possibility for other proton-neutron couplings involving deformed shapes.…”

Section: Confirming the Existence Of Two β-Decaying States In 72 Comentioning

confidence: 61%

Low-lying excitations inNi72

Morales¹,

Benzoni²,

Watanabe³

et al. 2016

Phys. Rev. C

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Low-lying excited states in 72 Ni have been investigated in an in-flight fission experiment at the RIBF facility of the RIKEN Nishina Center. The combination of the state-of-the-art BigRIPS and EURICA setups has allowed for a very accurate study of the β decay from 72 Co to 72 Ni, and has provided first experimental information on the decay sequence 72 Fe → 72 Co → 72 Ni and on the delayed neutron-emission branch 73 Co → 72 Ni. Accordingly, we report nearly 60 previously unobserved γ transitions which deexcite 21 new levels in 72 Ni. Evidence for the location of the so-sought-after (4 + 2 ), (6 + 2 ), and (8 + 1 ) seniority states is provided. As well, the existence of a low-spin β-decaying isomer in odd-odd neutron-rich Co isotopes is confirmed for mass A = 72. The new experimental information is compared to simple shell-model calculations including only neutron excitations across the fpg shells. It is shown that, in general, the calculations reproduce well the observed states.

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“…Further, many efforts have been devoted to the characterization of the N = 50 shell gap [13][14][15][16][17][18][19][20] and support a possible weakening of the gap at Z = 32 [21,22], whereas a persistent N = 50 gap has been suggested at Z = 30 [19]. The experimental efforts in this region have been focused on the study of low-energy states, providing crucial information on the valence single-particle energies and the relevant interaction [21,[21][22][23][24][25][26]. The γ -ray spectroscopy of 78 Ni was recently reported, providing the first experimental evidence of its doubly magic character [27].…”

mentioning

confidence: 99%