Precision mass measurements of 
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 and 
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: Nuclear structure toward 
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Cañete, L.; Giraud, S.; Kankainen, A.; Bastin, B.; Nowacki, F.; Poves, A.; Ascher, P.; Eronen, T.; Alcindor, V.; Jokinen, A.; Khanam, Afrina; Moore, I. D.; Nesterenko, D. A.; Santos, F. de Oliveira; Penttilä, H.; Petrone, C.; Pohjalainen, I.; Roubin, A. de; Rubchenya, V. A.; Vilén, M.; Äystö, J.

doi:10.1103/physrevc.101.041304

Cited by 17 publications

(9 citation statements)

References 89 publications

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“…68,69,70 Fe constitute the first direct mass measurements with precisions of δm/m ∼ 10 −7 , with previous measurements done via TOF-Bρ mass spectrometry [16]. The case of 67 Fe is notable, as our results deviate from a recent Penning trap mass measurement at JYFLTRAP [35] by ∼ 32σ. As seen in Fig.…”

supporting

confidence: 40%

Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes

Porter¹,

B.²,

Bergmann³

et al. 2022

Phys. Rev. C

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Nuclear properties across the chart of nuclides are key to improving and validating our understanding of the strong interaction in nuclear physics. We present high-precision mass measurements of neutron-rich Fe isotopes performed at the TITAN facility. The multiple-reflection time-of-flight mass spectrometer (MR-ToF-MS), achieving a resolving power greater than 600 000 for the first time, enabled the measurement of 63−70 Fe, including first-time high-precision direct measurements (δm/m ∼ 10 −7 ) of 68−70 Fe, as well as the discovery of a long-lived isomeric state in 69 Fe. These measurements are accompanied by both mean-field and ab initio calculations using the most recent realizations which enable theoretical assignment of the spin-parities of the 69 Fe ground and isomeric states. Together with mean-field calculations of quadrupole deformation parameters for the Fe isotope chain, these results benchmark a maximum of deformation in the N = 40 island of inversion in Fe, and shed light on trends in level densities indicated in the newly-refined mass surface.

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supporting

confidence: 40%

Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes

Porter¹,

B.²,

Bergmann³

et al. 2022

Phys. Rev. C

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“…Previous mass measurements, however, have not shown a strong subshell closure at N = 40 in the region [25][26][27][28][29]. The new JYFLTRAP measurements support the conclusion that the N = 40 subshell closure is rather weak, and gets weaker below nickel [30,31]. The identification of the isomeric states in the cobalt isotopes is crucial for accurate empirical shell-gap energies and also for the investigation of a possible island of inversion below 68 Ni [32,33].…”

Section: Nuclei In the Vicinity Of 78 Nimentioning

confidence: 53%

Recent experiments at the JYFLTRAP Penning trap

et al. 2020

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The JYFLTRAP double Penning trap mass spectrometer at the Ion Guide Isotope Separator On-Line (IGISOL) facility offers excellent possibilities for high-precision mass measurements of radioactive ions. Around 400 atomic masses, including around 50 isomeric states, have been measured since JYFLTRAP became operational. JYFLTRAP has also been used as a high-resolution mass separator for decay spectroscopy experiments as well as an ion counter for fission yield studies. In this contribution, an overview of recent activities at the JYFLTRAP Penning trap is given, with a focus on nuclei discussed in the PLATAN2019 meeting.

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“…The increase in collectivity as protons are removed from the Z = 28 closed-shell regime has also been deeply investigated [5,6,13,26,[43][44][45][46][47], indicating the development of a new island of inversion around N = 40 that extends beyond the harmonic-oscillator shell. Theoretically, the shaping of deformation around N = 40 appears to be driven not only by the variation in the number of protons and neutrons as one moves away from stability, but by many particle-hole excitations across energy gaps eventually induced by the proton-neutron tensor component of the nuclear force [48][49][50][51], which causes a reduction of the πf 7/2 − πf 5/2 spin-orbit splitting as neutrons occupy the νg 9/2 orbital [16,22,52].…”

Section: Introductionmentioning

confidence: 99%

Persistence of the ${Z=28}$ shell gap in ${A=75}$ isobars: Identification of a possible ${(1/2^-)}$ $μ$s isomer in ${^{75}}$Co and $β$ decay to ${^{75}}$Ni

Escrig,

Morales,

Nishimura

et al. 2021

Preprint

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Background: The evolution of shell structure around doubly-magic exotic nuclei is of great interest in nuclear physics and astrophysics. In the 'south-west' region of 78 Ni, the development of deformation might trigger a major shift in our understanding of explosive nucleosynthesis. To this end, new spectroscopic information on key close-lying nuclei is very valuable.Purpose: We intend to measure the isomeric and β decay of 75 Co, with one proton-and two neutron-holes relative to 78 Ni, to access new nuclear structure information in 75 Co and its β-decay daughters 75 Ni and 74 Ni.Methods: The nucleus 75 Co is produced in relativistic in-flight fission reactions of 238 U at the Radioactive Ion Beam Factory (RIBF) in the RIKEN Nishina Center. Its isomeric and β decay are studied exploiting the BigRIPS and EURICA setups.Results: We obtain partial β-decay spectra for 75 Ni and 74 Ni, and report a new isomeric transition in 75 Co. The energy (Eγ = 1914(2) keV) and half-life (t 1/2 = 13(6) µs) of the delayed γ ray lend support for the existence of a J π = (1/2 − ) isomeric state at 1914(2) keV. A comparison with PFSDG-U shell-model calculations provides good account for the observed states in 75 Ni, but the first calculated 1/2 − level in 75 Co, a prolate K = 1/2 state, is predicted about 1 MeV below the observed (1/2 − ) level.Conclusions: The spherical-like structure of the lowest-lying excited states in 75 Ni is proved. In the case of 75 Co, the results suggest that the dominance of the spherical configurations over the deformed ones might be stronger than expected below 78 Ni. Further experimental efforts to discern the nature of the J π = (1/2 − ) isomer are necessary.

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Precision mass measurements of Fe67 and Co69,70 : Nuclear structure toward
L. Cañete
¹
,
S. Giraud
²
,
A. Kankainen
³

et al.

Cited by 17 publications

References 89 publications

Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes

Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes

Recent experiments at the JYFLTRAP Penning trap

Persistence of the ${Z=28}$ shell gap in ${A=75}$ isobars: Identification of a possible ${(1/2^-)}$ $μ$s isomer in ${^{75}}$Co and $β$ decay to ${^{75}}$Ni

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Precision mass measurements of Fe67 and Co69,70 : Nuclear structure toward L. Cañete1, S. Giraud2, A. Kankainen3 et al.

Cited by 17 publications

References 89 publications

Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes

Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes

Recent experiments at the JYFLTRAP Penning trap

Persistence of the ${Z=28}$ shell gap in ${A=75}$ isobars: Identification of a possible ${(1/2^-)}$ $μ$s isomer in ${^{75}}$Co and $β$ decay to ${^{75}}$Ni

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Precision mass measurements of Fe67 and Co69,70 : Nuclear structure toward
L. Cañete
¹
,
S. Giraud
²
,
A. Kankainen
³

et al.