r-process isotopes in the 132Sn region

Kratz, K. L.; Pfeiffer, B.; Arndt, O.; Hennrich, S.; Wöhr, A.; Isolde, t; Collaborations, Is

doi:10.1140/epjad/i2005-06-157-2

Cited by 50 publications

(57 citation statements)

References 35 publications

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“…This study includes the halflives of the β-decaying states and the structure of the daughter nucleus 129 In. Prior to this work two β-decaying states in 129 Cd with half-lives of 104 (6) and 242(8) ms, respectively, have been reported [8][9][10][11]. While the longer half-life was associated with the proposed 11/2 − ground state, the shorter halflife was assigned to a 3/2 + β-decaying isomer [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Prior to this work two β-decaying states in 129 Cd with half-lives of 104 (6) and 242(8) ms, respectively, have been reported [8][9][10][11]. While the longer half-life was associated with the proposed 11/2 − ground state, the shorter halflife was assigned to a 3/2 + β-decaying isomer [9,10]. Recently the work by Yordanov et al confirmed the existence of 3/2 + and 11/2 − long-lived states in 129 Cd via laser spectroscopy [12].…”

Section: Introductionmentioning

confidence: 99%

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βdecay ofCd129and excited states inIn129

Taprogge¹,

Jungclaus²,

Grawe³

et al. 2015

Phys. Rev. C

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The β decay of 129 Cd, produced in the relativistic fission of a 238 U beam, was experimentally studied at the RIBF facility at the RIKEN Nishina Center. From the γ radiation emitted after the β decays a level scheme of 129 In was established comprising 31 excited states and 69 γ-ray transitions. The experimentally determined level energies are compared to state-of-the-art shellmodel calculations. The half-lives of the two β-decaying states in 129 Cd were deduced and the β feeding to excited states in 129 In analyzed. It is found that as in most cases in the Z<50, N ≤82 region both decays are dominated by the ν0g 7/2 → π0g 9/2 Gamow-Teller transition, although the contribution of first-forbidden transitions cannot be neglected.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

βdecay ofCd129and excited states inIn129

Taprogge¹,

Jungclaus²,

Grawe³

et al. 2015

Phys. Rev. C

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“…Qualitatively, if the spin-orbit splitting that gives rise to the N=82 shell gap is reduced by these mechanisms far from stability, the harmonic oscillator gap at N=70 may open up instead [23]. If this happens already for modest neutron-to-proton ratios, then it may be manifest at 110 Zr, whose 40 protons and 70 neutrons combine two harmonic oscillator shell closures [24]. This makes 110 Zr a prime benchmark for the dynamic interplay between shell structure and multipole correlations far from stability.…”

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confidence: 99%

“…Despite recent improvements from new -decay lifetimes [25], r -process calculations consistently fail to reproduce the elemental abundance distribution near mass 110. Currently this discrepancy is an entanglement of astrophysical and nuclear structure predictions, but a shell-stabilized 110 Zr is one proposed solution to this anomaly [24]. Spectroscopic information near 110 Zr will help delineate the N=70,82 shell evolution and constrain the structure models used in r -process simulations.…”

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confidence: 99%

Are There Signatures of Harmonic Oscillator Shells Far from Stability? First Spectroscopy of Zr110

Paul¹,

Corsi²,

Obertelli³

et al. 2017

Phys. Rev. Lett.

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The first measurement of the low-lying states of the neutron-rich 110 Zr and 112 Mo was performed via in-beam -ray spectroscopy after one proton removal on hydrogen at ⇠200 MeV/nucleon. The 2 + 1 excitation energies were found at 185(11) keV in 110 Zr, and 235(7) keV in 112 Mo, while the R42=E(4 + 1 )/E(2 + 1 ) ratios are 3.1(2), close to the rigid rotor value, and 2.7(1), respectively. These results are compared to modern energy density functional based configuration mixing models using Gogny and Skyrme e↵ective interactions. We conclude that first levels of 110 Zr exhibit a rotational behavior, in agreement with previous observations of lighter zirconium isotopes as well as with the most advanced Monte Carlo Shell Model predictions. The data therefore do not support a harmonic oscillator shell stabilization scenario at Z=40 and N=70. The present data also invalidate predictions for a tetrahedral ground state symmetry in 110 Zr.Nuclei, like atoms, manifest quantized energy states that can be interpreted in terms of an underlying shell structure-a convenient but non-observable theoretical construct [1,2]. Within the classical picture, large gaps between adjacent shells give rise to particularly stable configurations whose proton and neutron numbers are traditionally called "magic" [3]. The magic numbers for stable nuclei were first successfully described by invoking a one-body square-well and spin-orbit potential [4,5]; the latter was eventually replaced by a harmonic oscillator potential with l 2 term to obtain proper angular momentum splittings [6]. However, studies of radioactive nuclei over the past decades have shown that the magic numbers are not universal across the nuclear chart [7][8][9][10]. Despite intensive e↵ort, the theoretical description of these structural changes is not yet fully understood and the mechanisms that drive structural evolution di↵er between models. Within

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“…This is illustrated in Figure 3, where we have also included updated nuclear physics in comparison to Farouqi et al (2010) and the results presented in Ott et al (2009). Significant changes derive from 'new nuclear structure' as inferred from the experiments of Dillmann et al (2003), Kratz et al (2005) and Arndt et al (2009Arndt et al ( , 2011 concerning the yields P n for b-delayed neutron emission. Most important are changes for 134 Cd (new:…”

Section: Xe-h and R-process Nucleosynthesismentioning

confidence: 99%

New Attempts to Understand Nanodiamond Stardust

Ott

Besmehn

Farouqi

et al. 2012

Publ. – Astron. Soc. Aust

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Abstract:We report on a concerted effort aimed at understanding the origin and history of the pre-solar nanodiamonds in meteorites including the astrophysical sources of the observed isotopic abundance signatures. This includes measurement of light elements by secondary ion mass spectrometry (SIMS), analysis of additional heavy trace elements by accelerator mass spectrometry (AMS) and dynamic calculations of r-process nucleosynthesis with updated nuclear properties. Results obtained indicate that: (i) there is no evidence for the former presence of now-extinct 26 Al and 44 Ti in our diamond samples other than what can be attributed to silicon carbide and other 'impurities', and this does not offer support for a supernova (SN) origin but neither does it negate it; (ii) analysis by AMS of platinum in 'bulk diamond' yields an overabundance of r-only 198 Pt that at face value seems more consistent with the neutron burst than with the separation model for the origin of heavy trace elements in the diamonds, although this conclusion is not firm given analytical uncertainties; (iii) if the Xe-H pattern was established by an unadulterated r-process, it must have been a strong variant of the main r-process, which possibly could also account for the new observations in platinum.

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r-process isotopes in the 132Sn region

Cited by 50 publications

References 35 publications

βdecay ofCd129and excited states inIn129

βdecay ofCd129and excited states inIn129

Are There Signatures of Harmonic Oscillator Shells Far from Stability? First Spectroscopy of Zr110

New Attempts to Understand Nanodiamond Stardust

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