DOE OSTI · 3395417
Dipole Strength Distribution of 8 He and Decay Characteristics
Abstract
The weak binding and spatially extended neutron densities characteristic of drip-line nuclei give rise to a distinctive low-energy dipole response. The drip-line nucleus 8 He is the most neutron-rich bound nucleus with a mass-to-charge ratio of 𝐴/𝑍 = 4. We measure the dipole response of 8 He, including for the first time the four-neutron decay channel. A total dipole strength of ∑𝐵(𝐸1)(𝐸*< 15 MeV) = 0.95(16)𝑒 2 fm 2 and a dipole polarizability of 𝛼 𝐷 = 0.61(1) fm 3 are extracted from the differential Coulomb-excitation cross section and compared to state-of-the-art theoretical calculations employing coupled cluster and three-body approaches. We find that the dipole continuum is dominated, even at high excitation energies well above the 4𝑛 decay threshold, by two-neutron emission, pointing to a 6 He + 2𝑛 structure of the excited dipole mode. No indication was found for a 4𝑛 final-state correlation, while pronounced 𝑛𝑛 and 6 He−𝑛 final-state correlations are apparent.
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Lehr, C. [Technical University of Darmstadt (Germany); et al.] (ORCID:0000000309499349), Aumann, T. [Technische Universität Darmstadt; GSI Helmholtzzentrum für Schwerionenforschung GmbH; Helmholtz Forschungsakademie Hessen für FAIR] (ORCID:0000000316609294), Duer, Michael [Technische Universität Darmstadt] (ORCID:0000000242411938), Saito, A. T. [Institute of Science Tokyo], Nakamura, T. [Institute of Science Tokyo] (ORCID:0000000218389363), Achouri, N. L. [Université de Caen Normandie; ENSICAEN; LPC-Caen] (ORCID:0000000344116796), Ahn, D. [RIKEN Nishina Center for Accelerator-Based Science], Baba, H. [RIKEN Nishina Center for Accelerator-Based Science] (ORCID:0000000344538120), Bacca, Sonia [Johannes Gutenberg-Universität] (ORCID:0000000291899458), Bertulani, C. A. [East Texas A&M University] (ORCID:0000000240656237), Böhmer, M. [Technische Universität München] (ORCID:0000000323597180), Bonaiti, Francesca [Johannes Gutenberg-Universität; Facility for Rare Isotope Beams; Oak Ridge National Laboratory] (ORCID:0000000239261609), Boretzky, K. [GSI Helmholtzzentrum für Schwerionenforschung GmbH] (ORCID:0000000164715222), Caesar, C. [Technische Universität Darmstadt; GSI Helmholtzzentrum für Schwerionenforschung GmbH; RIKEN Nishina Center for Accelerator-Based Science] (ORCID:0000000158447073), Chiga, N. [RIKEN Nishina Center for Accelerator-Based Science] (ORCID:0009000632383634), Cortina-Gil, D. [Universidade de Santiago de Compostela], Douma, C. A. [University of Groningen] (ORCID:0000000323680961), Dufter, F. [Technische Universität München] (ORCID:0009000672543428), Elekes, Z. [HUN-REN ATOMKI; University of Debrecen] (ORCID:0000000305718719), Feng, J. [Peking University], Fernández-Domínguez, B. [Universidade de Santiago de Compostela] (ORCID:0000000178592438), Forsberg, U. [University of York], Fukuda, N. [RIKEN Nishina Center for Accelerator-Based Science], Gasparic, I. [Rudjer Bošković Institute; Technische Universität Darmstadt; RIKEN Nishina Center for Accelerator-Based Science] (ORCID:0000000250223312), Ge, Z. [RIKEN Nishina Center for Accelerator-Based Science] (ORCID:0000000185866134), Gernhäuser, R. [Technische Universität München] (ORCID:0000000317784262), Gheller, J. M. [IRFU; CEA; Université Paris-Saclay], Gibelin, J. [Université de Caen Normandie; ENSICAEN; LPC-Caen] (ORCID:0000000167513714), Gillibert, A. [IRFU; CEA; Université Paris-Saclay], Hahn, K. I. [Ewha Womans University; Institute for Basic Science] (ORCID:0000000292506484), Halász, Z. [HUN-REN ATOMKI] (ORCID:0000000246785232), Harakeh, M. N. [University of Groningen] (ORCID:0000000272711712), Hirayama, A. [Institute of Science Tokyo], Holl, M. [Technische Universität Darmstadt] (ORCID:0000000273464047), Inabe, N. [RIKEN Nishina Center for Accelerator-Based Science], Isobe, T. [RIKEN Nishina Center for Accelerator-Based Science] (ORCID:000000015163030X), Kahlbow, J. [Technische Universität Darmstadt] (ORCID:0000000266042372), Kalantar-Nayestanaki, N. [University of Groningen] (ORCID:0000000210337200), Kim, D. [Institute for Basic Science], Kim, S. [Institute for Basic Science; Technische Universität Darmstadt] (ORCID:0000000242255015), Kobayashi, T. [Tohoku University], Kondo, Y. [Institute of Science Tokyo], Körper, D. [GSI Helmholtzzentrum für Schwerionenforschung GmbH], Koseoglou, P. [Technische Universität Darmstadt] (ORCID:0000000345204448), Kubota, Y. [RIKEN Nishina Center for Accelerator-Based Science] (ORCID:0000000336830500), Li, P. J. [The University of Hong Kong; Fudan University] (ORCID:0000000165424697), Lindberg, S. [Chalmers University of Technology] (ORCID:0009000679278129), Liu, Y. [Peking University], Marqués, F. M. [Université de Caen Normandie; ENSICAEN; LPC-Caen] (ORCID:0000000294566448), Masuoka, S. [The University of Tokyo], Matsumoto, M. [Institute of Science Tokyo], Mayer, J. [Universität zu Köln] (ORCID:0000000287815338), Miki, K. [Technische Universität Darmstadt; Tohoku University] (ORCID:0000000180679882), Miwa, M. [RIKEN Nishina Center for Accelerator-Based Science], Monteagudo, B. [Université de Caen Normandie; ENSICAEN; LPC-Caen], Obertelli, A. [Technische Universität Darmstadt; IRFU; CEA; Université Paris-Saclay] (ORCID:0000000187737942), Orr, N. A. [Université de Caen Normandie; ENSICAEN; LPC-Caen] (ORCID:0000000284998693), Otsu, H. [RIKEN Nishina Center for Accelerator-Based Science], Panin, V. [RIKEN Nishina Center for Accelerator-Based Science; GSI Helmholtzzentrum für Schwerionenforschung GmbH], Park, S. Y. [Ewha Womans University; Institute for Basic Science], Parlog, M. [Université de Caen Normandie; ENSICAEN; LPC-Caen], Paschalis, S. [University of York; Technische Universität Darmstadt] (ORCID:0000000291133778), Potlog, P. M. [Institute of Space Sciences] (ORCID:0000000255953437), Reichert, S. [Technische Universität München] (ORCID:0009000325933747), Revel, A. [Université de Caen Normandie; ENSICAEN; LPC-Caen; GANIL; Facility for Rare Isotope Beams; Michigan State University] (ORCID:0000000327109287), Rossi, D. M. [Technische Universität Darmstadt] (ORCID:0000000224610618), Roth, Robert [Technische Universität Darmstadt] (ORCID:000000034991712X), Sasano, M. [RIKEN Nishina Center for Accelerator-Based Science], Scheit, H. [Technische Universität Darmstadt] (ORCID:0000000289371101), Schindler, F. [Technische Universität Darmstadt], Shimada, T. [Institute of Science Tokyo], Shimoura, S. [The University of Tokyo] (ORCID:0000000347412865), Simon, H. [GSI Helmholtzzentrum für Schwerionenforschung GmbH] (ORCID:0000000167911341), Storck Dutine, S. [Technische Universität Darmstadt] (ORCID:000900010635848X), Stuhl, L. [Institute for Basic Science; The University of Tokyo] (ORCID:0009000915310603), Suzuki, H. [RIKEN Nishina Center for Accelerator-Based Science], Symochko, D. [Technische Universität Darmstadt], Takeda, H. [RIKEN Nishina Center for Accelerator-Based Science], Takeuchi, S. [Institute of Science Tokyo], Tanaka, J. [Technische Universität Darmstadt; RIKEN Nishina Center for Accelerator-Based Science] (ORCID:0000000166168736), Togano, Y. [Institute of Science Tokyo] (ORCID:0000000161413122), Tomai, T. [Institute of Science Tokyo], Törnqvist, H. T. [Technische Universität Darmstadt; GSI Helmholtzzentrum für Schwerionenforschung GmbH] (ORCID:0000000192838430), Tscheuschner, J. [Technische Universität Darmstadt], Uesaka, T. [RIKEN Nishina Center for Accelerator-Based Science], Wagner, V. [Technische Universität Darmstadt] (ORCID:0000000306639430), Yamada, H. [Institute of Science Tokyo], Yang, B. [Peking University], Yang, L. [The University of Tokyo], Yang, Z. H. [RIKEN Nishina Center for Accelerator-Based Science], Yasuda, M. [Institute of Science Tokyo], Yoneda, K. [RIKEN Nishina Center for Accelerator-Based Science], Zanetti, L. [Technische Universität Darmstadt], Zenihiro, Juzo [RIKEN Nishina Center for Accelerator-Based Science; Kyoto University] (ORCID:0000000159177677). 2026-05-01. Dipole Strength Distribution of 8 He and Decay Characteristics. https://doi.org/10.1103/vp3m-5rpp
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