Buchumschlag

The dipole strength distribution of $^8$He and decay characteristics

Fuente: arXiv

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Bibliographische Detailangaben
Hauptverfasser:	Lehr, C., Aumann, T., Duer, M., Saito, A. T., Nakamura, T., Achouri, N. L., Ahn, D., Baba, H., Bacca, S., Bertulani, C. A., Böhmer, M., Bonaiti, F., Boretzky, K., Caesar, C., Chiga, N., Cortina-Gil, D., Douma, C. A., Dufter, F., Elekes, Z., Feng, J., Fernández-Domínguez, B., Forsberg, U., Fukuda, N., Gasparic, I., Ge, Z., Gernhäuser, R., Gheller, J. M., Gibelin, J., Gillibert, A., Hahn, K. I., Halász, Z., Harakeh, M. N., Hirayama, A., Holl, M., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Kobayashi, T., Kondo, Y., Körper, D., Koseoglou, P., Kubota, Y., Li, P. J., Lindberg, S., Liu, Y., Marqués, F. M., Masuoka, S., Matsumoto, M., Mayer, J., Miki, K., Miwa, M., Monteagudo, B., Obertelli, A., Orr, N. A., Otsu, H., Panin, V., Park, S. Y., Parlog, M., Paschalis, S., Potlog, P. M., Reichert, S., Revel, A., Rossi, D. M., Roth, R., Sasano, M., Scheit, H., Schindler, F., Shimada, T., Shimoura, S., Simon, H., Dutine, S. Storck, Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Takeuchi, S., Tanaka, J., Togano, Y., Tomai, T., Törnqvist, H. T., Tscheuschner, J., Uesaka, T., Wagner, V., Yamada, H., Yang, B., Yang, L., Yang, Z. H., Yasuda, M., Yoneda, K., Zanetti, L., Zenihiro, J.
Format:	Preprint
Veröffentlicht:	2026
Schlagworte:	Nuclear Experiment Nuclear Theory
Online-Zugang:	Acceder al recurso
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author	Lehr, C. Aumann, T. Duer, M. Saito, A. T. Nakamura, T. Achouri, N. L. Ahn, D. Baba, H. Bacca, S. Bertulani, C. A. Böhmer, M. Bonaiti, F. Boretzky, K. Caesar, C. Chiga, N. Cortina-Gil, D. Douma, C. A. Dufter, F. Elekes, Z. Feng, J. Fernández-Domínguez, B. Forsberg, U. Fukuda, N. Gasparic, I. Ge, Z. Gernhäuser, R. Gheller, J. M. Gibelin, J. Gillibert, A. Hahn, K. I. Halász, Z. Harakeh, M. N. Hirayama, A. Holl, M. Inabe, N. Isobe, T. Kahlbow, J. Kalantar-Nayestanaki, N. Kim, D. Kim, S. Kobayashi, T. Kondo, Y. Körper, D. Koseoglou, P. Kubota, Y. Li, P. J. Lindberg, S. Liu, Y. Marqués, F. M. Masuoka, S. Matsumoto, M. Mayer, J. Miki, K. Miwa, M. Monteagudo, B. Obertelli, A. Orr, N. A. Otsu, H. Panin, V. Park, S. Y. Parlog, M. Paschalis, S. Potlog, P. M. Reichert, S. Revel, A. Rossi, D. M. Roth, R. Sasano, M. Scheit, H. Schindler, F. Shimada, T. Shimoura, S. Simon, H. Dutine, S. Storck Stuhl, L. Suzuki, H. Symochko, D. Takeda, H. Takeuchi, S. Tanaka, J. Togano, Y. Tomai, T. Törnqvist, H. T. Tscheuschner, J. Uesaka, T. Wagner, V. Yamada, H. Yang, B. Yang, L. Yang, Z. H. Yasuda, M. Yoneda, K. Zanetti, L. Zenihiro, J.
author_facet	Lehr, C. Aumann, T. Duer, M. Saito, A. T. Nakamura, T. Achouri, N. L. Ahn, D. Baba, H. Bacca, S. Bertulani, C. A. Böhmer, M. Bonaiti, F. Boretzky, K. Caesar, C. Chiga, N. Cortina-Gil, D. Douma, C. A. Dufter, F. Elekes, Z. Feng, J. Fernández-Domínguez, B. Forsberg, U. Fukuda, N. Gasparic, I. Ge, Z. Gernhäuser, R. Gheller, J. M. Gibelin, J. Gillibert, A. Hahn, K. I. Halász, Z. Harakeh, M. N. Hirayama, A. Holl, M. Inabe, N. Isobe, T. Kahlbow, J. Kalantar-Nayestanaki, N. Kim, D. Kim, S. Kobayashi, T. Kondo, Y. Körper, D. Koseoglou, P. Kubota, Y. Li, P. J. Lindberg, S. Liu, Y. Marqués, F. M. Masuoka, S. Matsumoto, M. Mayer, J. Miki, K. Miwa, M. Monteagudo, B. Obertelli, A. Orr, N. A. Otsu, H. Panin, V. Park, S. Y. Parlog, M. Paschalis, S. Potlog, P. M. Reichert, S. Revel, A. Rossi, D. M. Roth, R. Sasano, M. Scheit, H. Schindler, F. Shimada, T. Shimoura, S. Simon, H. Dutine, S. Storck Stuhl, L. Suzuki, H. Symochko, D. Takeda, H. Takeuchi, S. Tanaka, J. Togano, Y. Tomai, T. Törnqvist, H. T. Tscheuschner, J. Uesaka, T. Wagner, V. Yamada, H. Yang, B. Yang, L. Yang, Z. H. Yasuda, M. Yoneda, K. Zanetti, L. Zenihiro, J.
contents	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 $\sum B(E1)(E^*<15$~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.
format	Preprint
id	arxiv_https___arxiv_org_abs_2603_24341
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	The dipole strength distribution of $^8$He and decay characteristics Lehr, C. Aumann, T. Duer, M. Saito, A. T. Nakamura, T. Achouri, N. L. Ahn, D. Baba, H. Bacca, S. Bertulani, C. A. Böhmer, M. Bonaiti, F. Boretzky, K. Caesar, C. Chiga, N. Cortina-Gil, D. Douma, C. A. Dufter, F. Elekes, Z. Feng, J. Fernández-Domínguez, B. Forsberg, U. Fukuda, N. Gasparic, I. Ge, Z. Gernhäuser, R. Gheller, J. M. Gibelin, J. Gillibert, A. Hahn, K. I. Halász, Z. Harakeh, M. N. Hirayama, A. Holl, M. Inabe, N. Isobe, T. Kahlbow, J. Kalantar-Nayestanaki, N. Kim, D. Kim, S. Kobayashi, T. Kondo, Y. Körper, D. Koseoglou, P. Kubota, Y. Li, P. J. Lindberg, S. Liu, Y. Marqués, F. M. Masuoka, S. Matsumoto, M. Mayer, J. Miki, K. Miwa, M. Monteagudo, B. Obertelli, A. Orr, N. A. Otsu, H. Panin, V. Park, S. Y. Parlog, M. Paschalis, S. Potlog, P. M. Reichert, S. Revel, A. Rossi, D. M. Roth, R. Sasano, M. Scheit, H. Schindler, F. Shimada, T. Shimoura, S. Simon, H. Dutine, S. Storck Stuhl, L. Suzuki, H. Symochko, D. Takeda, H. Takeuchi, S. Tanaka, J. Togano, Y. Tomai, T. Törnqvist, H. T. Tscheuschner, J. Uesaka, T. Wagner, V. Yamada, H. Yang, B. Yang, L. Yang, Z. H. Yasuda, M. Yoneda, K. Zanetti, L. Zenihiro, J. Nuclear Experiment Nuclear Theory 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 $\sum B(E1)(E^*<15$~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.
title	The dipole strength distribution of $^8$He and decay characteristics
topic	Nuclear Experiment Nuclear Theory
url	https://arxiv.org/abs/2603.24341