Direct observation of three-neutron emission from $^7$He$^*$ and the search for the trineutron

Fuente: arXiv

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Bibliographic Details
Main Authors:	Huang, S. W., Lenain, C., Yang, Z. H., Marqués, F. M., Gibelin, J., Li, J. G., Matta, A., Orr, N. A., Achouri, N. L., Ahn, D. S., Anne, A., Aumann, T., Baba, H., Beaumel, D., Böhmer, M., Boretzky, K., Caamaño, M., Chen, N., Chen, S., Chiga, N., Cortés, M. L., Cortina, D., Doornenbal, P., Douma, C. A., Dufter, F., Feng, J., Fernández-Domínguez, B., Elekes, Z., Forsberg, U., Fujino, T., Fukuda, N., Gašparić, I., Ge, Z., Gernhäuser, R., Gheller, J. M., Gillibert, A., Halász, Z., Harada, T., Harakeh, M. N., Hirayama, A., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Kiyotake, S., Kobayashi, T., Koerper, D., Kondo, Y., Koseoglou, P., Kubota, Y., Kuti, I., Lehr, C., Li, P. J., Liu, Y., Maeda, Y., Masuoka, S., Matsumoto, M., Mayer, J., Michel, N., Miki, H., Miwa, M., Monteagudo, B., Murray, I., Nakamura, T., Obertelli, A., Otsu, H., Panin, V., Park, S., Parlog, M., Paschalis, S., Potlog, M., Reichert, S., Revel, A., Rossi, D., Saito, A. T., Sasano, M., Sato, H., Scheit, H., Schindler, F., Shimada, T., Shimizu, Y., Shimoura, S., Simon, H., Stefan, I., Storck, S., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Takeuchi, S., Tanaka, J., Togano, Y., Tomai, T., Törnqvist, H. T., Tronchin, E., Tscheuschner, J., Wagner, V., Wimmer, K., Xie, M. R., Yamada, H., Yang, B., Yang, L., Yasuda, M., Ye, Y. L., Yoneda, K., Zanetti, L., Zenihiro, J., Uesaka, T.
Format:	Preprint
Published:	2026
Subjects:	Nuclear Experiment Nuclear Theory
Online Access:	Acceder al recurso
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author	Huang, S. W. Lenain, C. Yang, Z. H. Marqués, F. M. Gibelin, J. Li, J. G. Matta, A. Orr, N. A. Achouri, N. L. Ahn, D. S. Anne, A. Aumann, T. Baba, H. Beaumel, D. Böhmer, M. Boretzky, K. Caamaño, M. Chen, N. Chen, S. Chiga, N. Cortés, M. L. Cortina, D. Doornenbal, P. Douma, C. A. Dufter, F. Feng, J. Fernández-Domínguez, B. Elekes, Z. Forsberg, U. Fujino, T. Fukuda, N. Gašparić, I. Ge, Z. Gernhäuser, R. Gheller, J. M. Gillibert, A. Halász, Z. Harada, T. Harakeh, M. N. Hirayama, A. Inabe, N. Isobe, T. Kahlbow, J. Kalantar-Nayestanaki, N. Kim, D. Kim, S. Kiyotake, S. Kobayashi, T. Koerper, D. Kondo, Y. Koseoglou, P. Kubota, Y. Kuti, I. Lehr, C. Li, P. J. Liu, Y. Maeda, Y. Masuoka, S. Matsumoto, M. Mayer, J. Michel, N. Miki, H. Miwa, M. Monteagudo, B. Murray, I. Nakamura, T. Obertelli, A. Otsu, H. Panin, V. Park, S. Parlog, M. Paschalis, S. Potlog, M. Reichert, S. Revel, A. Rossi, D. Saito, A. T. Sasano, M. Sato, H. Scheit, H. Schindler, F. Shimada, T. Shimizu, Y. Shimoura, S. Simon, H. Stefan, I. Storck, S. Stuhl, L. Suzuki, H. Symochko, D. Takeda, H. Takeuchi, S. Tanaka, J. Togano, Y. Tomai, T. Törnqvist, H. T. Tronchin, E. Tscheuschner, J. Wagner, V. Wimmer, K. Xie, M. R. Yamada, H. Yang, B. Yang, L. Yasuda, M. Ye, Y. L. Yoneda, K. Zanetti, L. Zenihiro, J. Uesaka, T.
author_facet	Huang, S. W. Lenain, C. Yang, Z. H. Marqués, F. M. Gibelin, J. Li, J. G. Matta, A. Orr, N. A. Achouri, N. L. Ahn, D. S. Anne, A. Aumann, T. Baba, H. Beaumel, D. Böhmer, M. Boretzky, K. Caamaño, M. Chen, N. Chen, S. Chiga, N. Cortés, M. L. Cortina, D. Doornenbal, P. Douma, C. A. Dufter, F. Feng, J. Fernández-Domínguez, B. Elekes, Z. Forsberg, U. Fujino, T. Fukuda, N. Gašparić, I. Ge, Z. Gernhäuser, R. Gheller, J. M. Gillibert, A. Halász, Z. Harada, T. Harakeh, M. N. Hirayama, A. Inabe, N. Isobe, T. Kahlbow, J. Kalantar-Nayestanaki, N. Kim, D. Kim, S. Kiyotake, S. Kobayashi, T. Koerper, D. Kondo, Y. Koseoglou, P. Kubota, Y. Kuti, I. Lehr, C. Li, P. J. Liu, Y. Maeda, Y. Masuoka, S. Matsumoto, M. Mayer, J. Michel, N. Miki, H. Miwa, M. Monteagudo, B. Murray, I. Nakamura, T. Obertelli, A. Otsu, H. Panin, V. Park, S. Parlog, M. Paschalis, S. Potlog, M. Reichert, S. Revel, A. Rossi, D. Saito, A. T. Sasano, M. Sato, H. Scheit, H. Schindler, F. Shimada, T. Shimizu, Y. Shimoura, S. Simon, H. Stefan, I. Storck, S. Stuhl, L. Suzuki, H. Symochko, D. Takeda, H. Takeuchi, S. Tanaka, J. Togano, Y. Tomai, T. Törnqvist, H. T. Tronchin, E. Tscheuschner, J. Wagner, V. Wimmer, K. Xie, M. R. Yamada, H. Yang, B. Yang, L. Yasuda, M. Ye, Y. L. Yoneda, K. Zanetti, L. Zenihiro, J. Uesaka, T.
contents	Three-neutron emission from $^7$He has been directly measured for the first time, following neutron knockout from a $^8$He beam at 156 MeV/nucleon. A resonance-like structure at $2.08(4)$ MeV above the $^4$He+$3n$ threshold [$E_x=2.68(4)$ MeV] with a width of $3.9(2)$ MeV was observed and deduced to arise predominately from the predicted $J^π=3/2^{-}_2$ level. The three-neutron invariant-mass spectrum was reconstructed and found to peak at around 1 MeV and could, through complete simulations incorporating neutron-neutron correlations, be very well described by the sequential decay of $^7$He$^*$ via the $2_1^+$ excited state of $^6$He. No evidence was found for any significant three-neutron correlations beyond those expected from well-established two-body interactions, including a trineutron resonance.
format	Preprint
id	arxiv_https___arxiv_org_abs_2603_10859
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Direct observation of three-neutron emission from $^7$He$^$ and the search for the trineutron Huang, S. W. Lenain, C. Yang, Z. H. Marqués, F. M. Gibelin, J. Li, J. G. Matta, A. Orr, N. A. Achouri, N. L. Ahn, D. S. Anne, A. Aumann, T. Baba, H. Beaumel, D. Böhmer, M. Boretzky, K. Caamaño, M. Chen, N. Chen, S. Chiga, N. Cortés, M. L. Cortina, D. Doornenbal, P. Douma, C. A. Dufter, F. Feng, J. Fernández-Domínguez, B. Elekes, Z. Forsberg, U. Fujino, T. Fukuda, N. Gašparić, I. Ge, Z. Gernhäuser, R. Gheller, J. M. Gillibert, A. Halász, Z. Harada, T. Harakeh, M. N. Hirayama, A. Inabe, N. Isobe, T. Kahlbow, J. Kalantar-Nayestanaki, N. Kim, D. Kim, S. Kiyotake, S. Kobayashi, T. Koerper, D. Kondo, Y. Koseoglou, P. Kubota, Y. Kuti, I. Lehr, C. Li, P. J. Liu, Y. Maeda, Y. Masuoka, S. Matsumoto, M. Mayer, J. Michel, N. Miki, H. Miwa, M. Monteagudo, B. Murray, I. Nakamura, T. Obertelli, A. Otsu, H. Panin, V. Park, S. Parlog, M. Paschalis, S. Potlog, M. Reichert, S. Revel, A. Rossi, D. Saito, A. T. Sasano, M. Sato, H. Scheit, H. Schindler, F. Shimada, T. Shimizu, Y. Shimoura, S. Simon, H. Stefan, I. Storck, S. Stuhl, L. Suzuki, H. Symochko, D. Takeda, H. Takeuchi, S. Tanaka, J. Togano, Y. Tomai, T. Törnqvist, H. T. Tronchin, E. Tscheuschner, J. Wagner, V. Wimmer, K. Xie, M. R. Yamada, H. Yang, B. Yang, L. Yasuda, M. Ye, Y. L. Yoneda, K. Zanetti, L. Zenihiro, J. Uesaka, T. Nuclear Experiment Nuclear Theory Three-neutron emission from $^7$He has been directly measured for the first time, following neutron knockout from a $^8$He beam at 156 MeV/nucleon. A resonance-like structure at $2.08(4)$ MeV above the $^4$He+$3n$ threshold [$E_x=2.68(4)$ MeV] with a width of $3.9(2)$ MeV was observed and deduced to arise predominately from the predicted $J^π=3/2^{-}_2$ level. The three-neutron invariant-mass spectrum was reconstructed and found to peak at around 1 MeV and could, through complete simulations incorporating neutron-neutron correlations, be very well described by the sequential decay of $^7$He$^$ via the $2_1^+$ excited state of $^6$He. No evidence was found for any significant three-neutron correlations beyond those expected from well-established two-body interactions, including a trineutron resonance.
title	Direct observation of three-neutron emission from $^7$He$^*$ and the search for the trineutron
topic	Nuclear Experiment Nuclear Theory
url	https://arxiv.org/abs/2603.10859