Evidence for a Change in the Nuclear Mass Surface with the Discovery of the Most Neutron-Rich Nuclei with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>17</mml:mn><mml:mo>≤</mml:mo><mml:mi>Z</mml:mi><mml:mo>≤</mml:mo><mml:mn>25</mml:mn></mml:math>

Tarasov, O.; Morrissey, D. J.; Amthor, A. M.; Baumann, T.; Bazin, D.; Gade, A.; Ginter, T. N.; Hausmann, M.; Inabe, N.; Kubo, T.; Nettleton, A. S.; Pereira, J.; Portillo, M.; Sherrill, B. M.; Stolz, A.; Thoennessen, M.

doi:10.1103/physrevlett.102.142501

Cited by 93 publications

(24 citation statements)

References 23 publications

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“…Important questions concern magic neutron numbers beyond the well established N = 20 and N = 28, and the evolution of shell structure in heavy isotopes of calcium. 58 Ca is the heaviest isotope of calcium produced so far (Tarasov et al, 2009), but precise masses are only known up to 54 Ca (Wienholtz et al, 2013). Meanfield calculations predict that the neutron drip line is around 70 Ca (Nazarewicz et al, 1996;Fayans et al, 2000;Meng et al, 2002;Erler et al, 2012).…”

Section: Neutron-rich Isotopes Of Calciummentioning

confidence: 99%

Coupled-cluster computations of atomic nuclei

et al. 2014

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In the past decade, coupled-cluster theory has seen a renaissance in nuclear physics, with computations of neutron-rich and medium-mass nuclei. The method is efficient for nuclei with product-state references, and it describes many aspects of weakly bound and unbound nuclei. This report reviews the technical and conceptual developments of this method in nuclear physics, and the results of coupled-cluster calculations for nucleonic matter, and for exotic isotopes of helium, oxygen, calcium, and some of their neighbors.

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Section: Neutron-rich Isotopes Of Calciummentioning

confidence: 99%

Coupled-cluster computations of atomic nuclei

et al. 2014

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“…This discovery extends the range of known nuclei in this region, previously established in Refs. [7,8]. In separate experimental studies, the atomic masses of 55−57 Ca were determined [2] and the uncertainties of the 52−55 Ti mass values were significantly reduced [9].…”

mentioning

confidence: 99%

“…Indeed, with the exception of SV-min, UNEDF0, and FRDM-2012, other models calculate them to be either marginally bound or to lie outside the one-neutron drip line. Since 49 S, 52 Cl and 53 Ar do exist [1,7], this prior knowledge can inform the model averaging process [56][57][58] through posterior weights: 53 Ar, 49 S exist (1) (see additional discussion in SM). The weight w k reflects the ability of the model M k to predict the existence of nuclei in the Ca region.…”

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confidence: 99%

Neutron Drip Line in the Ca Region from Bayesian Model Averaging

et al. 2019

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The region of heavy calcium isotopes forms the frontier of experimental and theoretical nuclear structure research where the basic concepts of nuclear physics are put to stringent test. The recent discovery of the extremely neutron-rich nuclei around 60 Ca [1] and the experimental determination of masses for 55−57 Ca [2] provide unique information about the binding energy surface in this region. To assess the impact of these experimental discoveries on the nuclear landscape's extent, we use global mass models and statistical machine learning to make predictions, with quantified levels of certainty, for bound nuclides between Si and Ti. Using a Bayesian model averaging analysis based on Gaussianprocess-based extrapolations we introduce the posterior probability pex for each nucleus to be bound to neutron emission. We find that extrapolations for drip-line locations, at which the nuclear binding ends, are consistent across the global mass models used, in spite of significant variations between their raw predictions. In particular, considering the current experimental information and current global mass models, we predict that 68 Ca has an average posterior probability pex ≈ 76% to be bound to two-neutron emission while the nucleus 61 Ca is likely to decay by emitting a neutron (pex ≈ 46%).

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“…Other blocks: experimentally identified nuclei (∼3,000 nuclei) [2,4,5,6]. The colors other than brown classify the half-lives as in Fig.…”

Section: Using the 3d Chartmentioning

confidence: 99%

Three-dimensional nuclear chart—understanding nuclear physics and nucleosynthesis in stars

Koura

2014

Phys. Educ.

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Abstract. Three-dimensional (3D) nuclear charts were created by using toy blocks, which represent the atomic masses per nucleon number and the total half-lives for each nucleus in the entire region of the nuclear mass. The bulk properties of the nuclei can be easily understood by using these charts. Consequently, these charts have been used in outreach activities for the general public and high school students. As an example, an application for a lecture of nucleosynthesis in stars is introduced, and some explanations for the abundance of iron, the origin of uranium, etc., on planet Earth are given with the 3D chart.

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Evidence for a Change in the Nuclear Mass Surface with the Discovery of the Most Neutron-Rich Nuclei with17≤Z≤25

Abstract: Evidence for a change in the nuclear mass surface with the discovery of the most neutron-rich nuclei with 17 ≤ Z ≤ 25

Cited by 93 publications

References 23 publications

Coupled-cluster computations of atomic nuclei

Coupled-cluster computations of atomic nuclei

Neutron Drip Line in the Ca Region from Bayesian Model Averaging

Three-dimensional nuclear chart—understanding nuclear physics and nucleosynthesis in stars

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