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Achim Richter
Researcher at Technische Universität Darmstadt
Publications - 656
Citations - 18241
Achim Richter is an academic researcher from Technische Universität Darmstadt. The author has contributed to research in topics: Inelastic scattering & Electron. The author has an hindex of 61, co-authored 654 publications receiving 16937 citations. Previous affiliations of Achim Richter include University of Münster & University of Saskatchewan.
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Journal ArticleDOI
Experimental observation of the topological structure of exceptional points.
C. Dembowski,Hans-Dieter Gräf,Hanns Ludwig Harney,Andreas Heine,W. D. Heiss,H. Rehfeld,Achim Richter +6 more
TL;DR: A microwave cavity experiment where exceptional points (EPs), which are square root singularities of the eigenvalues as function of a complex interaction parameter, are encircled in the laboratory and one of the Eigenvectors undergoes a sign change which can be discerned in the field patterns.
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New magnetic dipole excitation mode studied in the heavy deformed nucleus 156Gd by inelastic electron scattering
TL;DR: In this paper, the discovery of a new collective magnetic dipole excitation mode in high-resolution inelastic electron scattering on 64 156 Gd is discussed in terms of a geometrical two-rotor model and the interacting boson model.
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Complete electric dipole response and the neutron skin in 208Pb.
Atsushi Tamii,I. Poltoratska,P. von Neumann-Cosel,Yoshitaka Fujita,T. Adachi,Carlos A. Bertulani,J. Carter,Masanori Dozono,Hisanori Fujita,Kunihiro Fujita,Kichiji Hatanaka,D. Ishikawa,Masatoshi Itoh,Takeo Kawabata,Y. Kalmykov,A. M. Krumbholz,Elena Litvinova,Elena Litvinova,Hiroaki Matsubara,K. Nakanishi,R. Neveling,H. Okamura,Hooi Jin Ong,B. Özel-Tashenov,V. Yu. Ponomarev,Achim Richter,Achim Richter,B. Rubio,Harutaka Sakaguchi,Yasuhiro Sakemi,Yoshiko Sasamoto,Y. Shimbara,Y. Shimbara,Y. Shimizu,F. D. Smit,Takayoshi Suzuki,Y. Tameshige,Jochen Wambach,R. Yamada,M. Yosoi,Juzo Zenihiro +40 more
TL;DR: The extracted E1 polarizability leads to a neutron skin thickness close to that of a neutron star, thereby constraining the symmetry energy and its density dependence relevant to the description of neutron stars.
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Structure of the Hoyle State in C 12
TL;DR: A closer inspection of the model calculations, which reproduce the experimental findings, reveals that the term Bose-Einstein condensation of three alpha particles must not be taken too literally.
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Encircling an exceptional point.
Christian Dembowski,Barbara Dietz,Hans-Dieter Gräf,Hanns Ludwig Harney,Andreas Heine,W. D. Heiss,Achim Richter +6 more
TL;DR: The geometric phases that occur when an EP is encircled four times are measured and it is confirmed that for this system anEP is a branch point of fourth order.