Surveying the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>40</mml:mn></mml:mrow></mml:math>island of inversion with new manganese masses

Naimi, S.; Audi, G.; Beck, D.; Blaum, Klaus; Böhm, C.; Borgmann, Christopher; Breitenfeldt, M.; George, Sebastian; Herfurth, F.; Herlert, A.; Kellerbauer, A.; Kowalska, Magdalena; Lunney, D.; Minaya-Ramirez, E.; Neidherr, D.; Rosenbusch, M.; Schweikhard, L.; Wolf, R.; Zuber, Κ.

doi:10.1103/physrevc.86.014325

Cited by 50 publications

(38 citation statements)

References 82 publications

(154 reference statements)

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“…Recent shell model calculations using a larger valence space (pf shell for protons and pf 5/2 g 9/2 d 5/2 for neutrons with a 48 Ca core) [17] indicate an important role of the νd 5/2 orbital to describe the onset of collectivity below 68 Ni. Similar conclusions have been drawn from the spectroscopy of neutron-rich Cr isotopes [18,19] and are supported by recent mass measurements of heavy manganese isotopes [20]. A slightly increasing occupation of the νd 5/2 orbital in Fe isotopes with increasing neutron number is also predicted by beyond mean-field calculations [21], but remains small.…”

Section: Introductionsupporting

confidence: 84%

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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Section: Introductionsupporting

confidence: 84%

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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“…As energy differences are used to deduce the mass of the respective parent or daughter nuclide, incorrect level assignments may lead to systematic shifts. A thorough investigation is pursued in a separate publication which includes in addition to the data presented in table 3 also new data on neutron-rich manganese isotopes up to 66 Mn and a full new mass evaluation [37]. The present work concentrates on the recoil-ion trapping and its efficiency.…”

Section: Q-values From Mass Measurementsmentioning

confidence: 99%

“…The large axial trapping potential, the magnetic field, and the damping effect of the buffer gas are enough to retain the recoiling daughter-nuclide ions in the trap volume. The feasibility of this approach has been shown in a preliminary study with 37 K + ions which β + decayed into 37 Ar + in the trap [22]. In the present work, this procedure was applied to the decay of neutron-rich manganese isotopes into iron isotopes in order to gain access to these nuclides for mass measurements for the first time at ISOLDE.…”

Section: Introductionmentioning

confidence: 99%

Recoil-ion trapping for precision mass measurements

et al. 2012

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Abstract. For the first time masses of recoiling daughter ions have been measured that were held after beta-decay in a buffer-gas-filled Penning trap. From the masses of the trapped beta-decaying manganese ions 61-63 Mn + and the daughter recoil-ions 61-63 Fe + the Q values of 61-63 Mn have been deduced with absolute uncertainties of about 5 keV. The observed yields of iron ions are compared to the results from simulations, which confirm a recoil-ion trapping efficiency of about 50%.

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“…Below 68 Ni, high-precision mass spectrometry studies have reached down as far as the manganese chain [19,20], while laser-spectroscopy information is only available for the manganese isotopes [21][22][23]. Time-of-flight mass measurement results in the atomic mass evaluation 2016 [24] suggest a sudden onset of deformation towards N =40 in the chromium chain.…”

mentioning

confidence: 99%

Precision Mass Measurements of Cr58–63 : Nuclear Collectivity Towards the N=40 Island

et al. 2018

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The neutron-rich isotopes 58−63 Cr were produced for the first time at the ISOLDE facility and their masses were measured with the ISOLTRAP spectrometer. The new values are up to 300 times more precise than those in the literature and indicate significantly different nuclear structure from the new mass-surface trend. A gradual onset of deformation is found in this proton and neutron mid-shell region, which is a gateway to the second island of inversion around N =40. In addition to comparisons with density-functional theory and large-scale shell-model calculations, we present predictions from the valence-space formulation of the ab initio in-medium similarity renormalization group, the first such results for open-shell chromium isotopes. PACS numbers: 82.80.Qx, 82.80.Rt, 21.10.Dr, 21.60.CsOver the last few decades, the stability of proton and neutron "magic" numbers has been a major focus of experimental nuclear physics. Early momentum came from the vanishing of the N =20 shell closure near 32 Mg in mass measurements [1] from which arose the idea of the "island of inversion".Extensive effort has followed to examine the classical signatures for magicity in exotic nuclei (e.g empirical shell gap or the energy of the first excited 2 + 1 state). More than three decades later, the robustness of all major shell closures has been assessed [2]. Along the way,

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Surveying theN=40island of inversion with new manganese masses

Cited by 50 publications

References 82 publications

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

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

Recoil-ion trapping for precision mass measurements

Precision Mass Measurements of Cr58–63 : Nuclear Collectivity Towards the N=40 Island

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