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  1. Article: Micromechanical Characterisation of Ni/PU Hybrid Foams.

    Reis, Martin / König, Kristian / Diebels, Stefan / Jung, Anne

    Materials (Basel, Switzerland)

    2020  Volume 13, Issue 17

    Abstract: The computer-aided design of individual parts and the desire for weight reduction and material savings require further development of new hybrid materials. Ni/PU hybrid foams as a new hybrid material offer great potential for the production of components ...

    Abstract The computer-aided design of individual parts and the desire for weight reduction and material savings require further development of new hybrid materials. Ni/PU hybrid foams as a new hybrid material offer great potential for the production of components that are lightweight and yet can absorb large amounts of energy. The development of this structured material is at its beginning and mechanical characterisation on all scales is necessary. Experimental investigations on individual struts must be carried out on the micro scale to understand the structure-properties-relationship. Inspite of the challenges raising due to the complex geometry of the struts, tensile tests, three-point bending tests and micro sections are presented in this work. Due to the stiff Ni coating on the outer diameter of the struts, the resistance against bending is around five times as high as against tensile loading. The correlation between the behaviour of the struts and the macroscopic material behaviour validates the planned use of the foams as energy absorbers.
    Language English
    Publishing date 2020-08-24
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma13173746
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Surprising Charge-Radius Kink in the Sc Isotopes at N=20.

    König, Kristian / Fritzsche, Stephan / Hagen, Gaute / Holt, Jason D / Klose, Andrew / Lantis, Jeremy / Liu, Yuan / Minamisono, Kei / Miyagi, Takayuki / Nazarewicz, Witold / Papenbrock, Thomas / Pineda, Skyy V / Powel, Robert / Reinhard, Paul-Gerhard

    Physical review letters

    2023  Volume 131, Issue 10, Page(s) 102501

    Abstract: Charge radii of neutron deficient ^{40}Sc and ^{41}Sc nuclei were determined using collinear laser spectroscopy. With the new data, the chain of Sc charge radii extends below the neutron magic number N=20 and shows a pronounced kink, generally taken as a ...

    Abstract Charge radii of neutron deficient ^{40}Sc and ^{41}Sc nuclei were determined using collinear laser spectroscopy. With the new data, the chain of Sc charge radii extends below the neutron magic number N=20 and shows a pronounced kink, generally taken as a signature of a shell closure, but one notably absent in the neighboring Ca, K, and Ar isotopic chains. Theoretical models that explain the trend at N=20 for the Ca isotopes cannot reproduce this puzzling behavior.
    Language English
    Publishing date 2023-09-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.131.102501
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  3. Article ; Online: Nuclear Charge Radii of Silicon Isotopes.

    König, Kristian / Berengut, Julian C / Borschevsky, Anastasia / Brinson, Alex / Brown, B Alex / Dockery, Adam / Elhatisari, Serdar / Eliav, Ephraim / Ruiz, Ronald F Garcia / Holt, Jason D / Hu, Bai-Shan / Karthein, Jonas / Lee, Dean / Ma, Yuan-Zhuo / Meißner, Ulf-G / Minamisono, Kei / Oleynichenko, Alexander V / Pineda, Skyy V / Prosnyak, Sergey D /
    Reitsma, Marten L / Skripnikov, Leonid V / Vernon, Adam / Zaitsevskii, Andréi

    Physical review letters

    2024  Volume 132, Issue 16, Page(s) 162502

    Abstract: The nuclear charge radius of ^{32}Si was determined using collinear laser spectroscopy. The experimental result was confronted with ab initio nuclear lattice effective field theory, valence-space in-medium similarity renormalization group, and mean field ...

    Abstract The nuclear charge radius of ^{32}Si was determined using collinear laser spectroscopy. The experimental result was confronted with ab initio nuclear lattice effective field theory, valence-space in-medium similarity renormalization group, and mean field calculations, highlighting important achievements and challenges of modern many-body methods. The charge radius of ^{32}Si completes the radii of the mirror pair ^{32}Ar-^{32}Si, whose difference was correlated to the slope L of the symmetry energy in the nuclear equation of state. Our result suggests L≤60  MeV, which agrees with complementary observables.
    Language English
    Publishing date 2024-05-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.132.162502
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  4. Article ; Online: SyProLei - A systematic product development process to exploit lightweight potentials while considering costs and CO2 emissions

    Kaspar, Jerome / König, Kristian / Scholz, Johannes / Quirin, Steven / Kleiner, Sven / Fleischer, Jürgen / Herrmann, Hans-Georg / Vielhaber, Michael

    2022  

    Abstract: 520 ... 525 ... In lightweight design, developers are used to face the conflicting objectives of functional fulfillment, economic performance, and sustainability. Against this background, however, a clearly structured approach for the satisfied use of ... ...

    Abstract 520

    525

    In lightweight design, developers are used to face the conflicting objectives of functional fulfillment, economic performance, and sustainability. Against this background, however, a clearly structured approach for the satisfied use of specific lightweight engineering methods within the product development is still missing. Thus, this contribution deals with the fundamental conception and first implementation of a systematic development methodology covering the disciplines of mechanics, electrics/electronics and software just like the focus on an integrated view on product, production and material aspects. To ensure an application-specific manifestation of the product development process for three exemplary use cases from small and medium-sized enterprises but also large corporations in the area of prosthetics, bike construction and plant engineering, the individually developed methods and tools are first generalized in order to make them adaptable to a wide variety of industries. As a result, one lightweight-specific method or tool (e.g., function mass analysis, “PPM solution correlator“ or “2D layout & weight drafting”) is introduced in more detail for all stages of the technically extended RFL(T)P approach derived from model-based systems engineering (MBSE).

    109
    Keywords lightweight design ; product development process ; engineering methods ; system engineering ; DDC::600 Technik ; Medizin ; angewandte Wissenschaften::620 Ingenieurwissenschaften
    Subject code 670
    Language English
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Charge Radius of Neutron-Deficient ^{54}Ni and Symmetry Energy Constraints Using the Difference in Mirror Pair Charge Radii.

    Pineda, Skyy V / König, Kristian / Rossi, Dominic M / Brown, B Alex / Incorvati, Anthony / Lantis, Jeremy / Minamisono, Kei / Nörtershäuser, Wilfried / Piekarewicz, Jorge / Powel, Robert / Sommer, Felix

    Physical review letters

    2021  Volume 127, Issue 18, Page(s) 182503

    Abstract: The nuclear root-mean-square charge radius of ^{54}Ni was determined with collinear laser spectroscopy to be R(^{54}Ni)=3.737(3)  fm. In conjunction with the known radius of the mirror nucleus ^{54}Fe, the difference of the charge radii was extracted as ... ...

    Abstract The nuclear root-mean-square charge radius of ^{54}Ni was determined with collinear laser spectroscopy to be R(^{54}Ni)=3.737(3)  fm. In conjunction with the known radius of the mirror nucleus ^{54}Fe, the difference of the charge radii was extracted as ΔR_{ch}=0.049(4)  fm. Based on the correlation between ΔR_{ch} and the slope of the symmetry energy at nuclear saturation density (L), we deduced 21≤L≤88  MeV. The present result is consistent with the L from the binary neutron star merger GW170817, favoring a soft neutron matter EOS, and barely consistent with the PREX-2 result within 1σ error bands. Our result indicates the neutron-skin thickness of ^{48}Ca as 0.15-0.21 fm.
    Language English
    Publishing date 2021-11-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.127.182503
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Application of the Continuous Stern-Gerlach Effect for Laser Spectroscopy of the ^{40}Ar^{13+} Fine Structure in a Penning Trap.

    Egl, Alexander / Arapoglou, Ioanna / Höcker, Martin / König, Kristian / Ratajczyk, Tim / Sailer, Tim / Tu, Bingsheng / Weigel, Andreas / Blaum, Klaus / Nörtershäuser, Wilfried / Sturm, Sven

    Physical review letters

    2019  Volume 123, Issue 12, Page(s) 123001

    Abstract: We report on the successful demonstration of a novel scheme for detecting optical transitions in highly charged ions. We applied it to determine the frequency of the dipole-forbidden 2p ^{2}P_{1/2}-^{2}P_{3/2} transition in the fine structure of ^{40}Ar^{ ...

    Abstract We report on the successful demonstration of a novel scheme for detecting optical transitions in highly charged ions. We applied it to determine the frequency of the dipole-forbidden 2p ^{2}P_{1/2}-^{2}P_{3/2} transition in the fine structure of ^{40}Ar^{13+} using a single ion stored in the harmonic potential of a Penning trap. Our measurement scheme does not require detection of fluorescence, instead it makes use of the continuous Stern-Gerlach effect. Our value of 679.216464(4)_{stat}(5)_{syst}  THz is in reasonable agreement with the current best literature values and improves its uncertainty by a factor of 24.
    Language English
    Publishing date 2019-10-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.123.123001
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  7. Article ; Online: Nuclear Charge Radii of ^{10,11}B.

    Maaß, Bernhard / Hüther, Thomas / König, Kristian / Krämer, Jörg / Krause, Jan / Lovato, Alessandro / Müller, Peter / Pachucki, Krzysztof / Puchalski, Mariusz / Roth, Robert / Sánchez, Rodolfo / Sommer, Felix / Wiringa, R B / Nörtershäuser, Wilfried

    Physical review letters

    2019  Volume 122, Issue 18, Page(s) 182501

    Abstract: The first laser spectroscopic determination of the change in the nuclear charge radius for a five-electron system is reported. This is achieved by combining high-accuracy ab initio mass-shift calculations and a high-accuracy measurement of the isotope ... ...

    Abstract The first laser spectroscopic determination of the change in the nuclear charge radius for a five-electron system is reported. This is achieved by combining high-accuracy ab initio mass-shift calculations and a high-accuracy measurement of the isotope shift in the 2s^{2}2p  ^{2}P_{1/2}→2s^{2}3s  ^{2}S_{1/2} ground state transition in boron atoms. Accuracy is increased by orders of magnitude for the stable isotopes ^{10,11}B and the results are used to extract their difference in the mean-square charge radius ⟨r_{c}^{2}⟩^{11}-⟨r_{c}^{2}⟩^{10}=-0.49(12)  fm^{2}. The result is qualitatively explained by a possible cluster structure of the boron nuclei and quantitatively used to benchmark new ab initio nuclear structure calculations using the no-core shell model and Green's function Monte Carlo approaches. These results are the foundation for a laser spectroscopic determination of the charge radius of the proton-halo candidate ^{8}B.
    Language English
    Publishing date 2019-05-31
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.122.182501
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  8. Article ; Online: Charge Radii of ^{55,56}Ni Reveal a Surprisingly Similar Behavior at N=28 in Ca and Ni Isotopes.

    Sommer, Felix / König, Kristian / Rossi, Dominic M / Everett, Nathan / Garand, David / de Groote, Ruben P / Holt, Jason D / Imgram, Phillip / Incorvati, Anthony / Kalman, Colton / Klose, Andrew / Lantis, Jeremy / Liu, Yuan / Miller, Andrew J / Minamisono, Kei / Miyagi, Takayuki / Nazarewicz, Witold / Nörtershäuser, Wilfried / Pineda, Skyy V /
    Powel, Robert / Reinhard, Paul-Gerhard / Renth, Laura / Romero-Romero, Elisa / Roth, Robert / Schwenk, Achim / Sumithrarachchi, Chandana / Teigelhöfer, Andrea

    Physical review letters

    2022  Volume 129, Issue 13, Page(s) 132501

    Abstract: Nuclear charge radii of ^{55,56}Ni were measured by collinear laser spectroscopy. The obtained information completes the behavior of the charge radii at the shell closure of the doubly magic nucleus ^{56}Ni. The trend of charge radii across the shell ... ...

    Abstract Nuclear charge radii of ^{55,56}Ni were measured by collinear laser spectroscopy. The obtained information completes the behavior of the charge radii at the shell closure of the doubly magic nucleus ^{56}Ni. The trend of charge radii across the shell closures in calcium and nickel is surprisingly similar despite the fact that the ^{56}Ni core is supposed to be much softer than the ^{48}Ca core. The very low magnetic moment μ(^{55}Ni)=-1.108(20)  μ_{N} indicates the impact of M1 excitations between spin-orbit partners across the N,Z=28 shell gaps. Our charge-radii results are compared to ab initio and nuclear density functional theory calculations, showing good agreement within theoretical uncertainties.
    Language English
    Publishing date 2022-09-02
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.129.132501
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  9. Article ; Online: High precision hyperfine measurements in Bismuth challenge bound-state strong-field QED.

    Ullmann, Johannes / Andelkovic, Zoran / Brandau, Carsten / Dax, Andreas / Geithner, Wolfgang / Geppert, Christopher / Gorges, Christian / Hammen, Michael / Hannen, Volker / Kaufmann, Simon / König, Kristian / Litvinov, Yuri A / Lochmann, Matthias / Maaß, Bernhard / Meisner, Johann / Murböck, Tobias / Sánchez, Rodolfo / Schmidt, Matthias / Schmidt, Stefan /
    Steck, Markus / Stöhlker, Thomas / Thompson, Richard C / Trageser, Christian / Vollbrecht, Jonas / Weinheimer, Christian / Nörtershäuser, Wilfried

    Nature communications

    2017  Volume 8, Page(s) 15484

    Abstract: Electrons bound in highly charged heavy ions such as hydrogen-like ... ...

    Abstract Electrons bound in highly charged heavy ions such as hydrogen-like bismuth
    Language English
    Publishing date 2017-05-16
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2041-1723
    ISSN (online) 2041-1723
    DOI 10.1038/ncomms15484
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