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Mass, spectroscopy and two-neutron decay of $^{16}$Be

Fuente: arXiv

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Auteurs principaux:	Monteagudo, B., Marqués, F. M., Gibelin, J., Orr, N. A., Corsi, A., Kubota, Y., Casal, J., Gómez-Camacho, J., Authelet, G., Baba, H., Caesar, C., Calvet, D., Delbart, A., Dozono, M., Feng, J., Flavigny, F., Gheller, J. -M., Giganon, A., Gillibert, A., Hasegawa, K., Isobe, T., Kanaya, Y., Kawakami, S., Kim, D., Kiyokawa, Y., Kobayashi, M., Kobayashi, N., Kobayashi, T., Kondo, Y., Korkulu, Z., Koyama, S., Lapoux, V., Maeda, Y., Motobayashi, T., Miyazaki, T., Nakamura, T., Nakatsuka, N., Nishio, Y., Obertelli, A., Ohkura, A., Ota, S., Otsu, H., Ozaki, T., Panin, V., Paschalis, S., Pollacco, E. C., Reichert, S., Rousse, J. -Y., Saito, A. T., Sakaguchi, S., Sako, M., Santamaria, C., Sasano, M., Sato, H., Shikata, M., Shimizu, Y., Shindo, Y., Stuhl, L., Sumikama, T., Sun, Y. L., Tabata, M., Togano, Y., Tsubota, J., Uesaka, T., Yang, Z. H., Yasuda, J., Yoneda, K., Zenihiro, J.
Format:	Preprint
Publié:	2024
Sujets:	Nuclear Experiment Nuclear Theory
Accès en ligne:	Acceder al recurso
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_version_	1866909087670730752
author	Monteagudo, B. Marqués, F. M. Gibelin, J. Orr, N. A. Corsi, A. Kubota, Y. Casal, J. Gómez-Camacho, J. Authelet, G. Baba, H. Caesar, C. Calvet, D. Delbart, A. Dozono, M. Feng, J. Flavigny, F. Gheller, J. -M. Giganon, A. Gillibert, A. Hasegawa, K. Isobe, T. Kanaya, Y. Kawakami, S. Kim, D. Kiyokawa, Y. Kobayashi, M. Kobayashi, N. Kobayashi, T. Kondo, Y. Korkulu, Z. Koyama, S. Lapoux, V. Maeda, Y. Motobayashi, T. Miyazaki, T. Nakamura, T. Nakatsuka, N. Nishio, Y. Obertelli, A. Ohkura, A. Ota, S. Otsu, H. Ozaki, T. Panin, V. Paschalis, S. Pollacco, E. C. Reichert, S. Rousse, J. -Y. Saito, A. T. Sakaguchi, S. Sako, M. Santamaria, C. Sasano, M. Sato, H. Shikata, M. Shimizu, Y. Shindo, Y. Stuhl, L. Sumikama, T. Sun, Y. L. Tabata, M. Togano, Y. Tsubota, J. Uesaka, T. Yang, Z. H. Yasuda, J. Yoneda, K. Zenihiro, J.
author_facet	Monteagudo, B. Marqués, F. M. Gibelin, J. Orr, N. A. Corsi, A. Kubota, Y. Casal, J. Gómez-Camacho, J. Authelet, G. Baba, H. Caesar, C. Calvet, D. Delbart, A. Dozono, M. Feng, J. Flavigny, F. Gheller, J. -M. Giganon, A. Gillibert, A. Hasegawa, K. Isobe, T. Kanaya, Y. Kawakami, S. Kim, D. Kiyokawa, Y. Kobayashi, M. Kobayashi, N. Kobayashi, T. Kondo, Y. Korkulu, Z. Koyama, S. Lapoux, V. Maeda, Y. Motobayashi, T. Miyazaki, T. Nakamura, T. Nakatsuka, N. Nishio, Y. Obertelli, A. Ohkura, A. Ota, S. Otsu, H. Ozaki, T. Panin, V. Paschalis, S. Pollacco, E. C. Reichert, S. Rousse, J. -Y. Saito, A. T. Sakaguchi, S. Sako, M. Santamaria, C. Sasano, M. Sato, H. Shikata, M. Shimizu, Y. Shindo, Y. Stuhl, L. Sumikama, T. Sun, Y. L. Tabata, M. Togano, Y. Tsubota, J. Uesaka, T. Yang, Z. H. Yasuda, J. Yoneda, K. Zenihiro, J.
contents	The structure and decay of the most neutron-rich beryllium isotope, $^{16}$Be, has been investigated following proton knockout from a high-energy $^{17}$B beam. Two relatively narrow resonances were observed for the first time, with energies of $0.84(3)$ and $2.15(5)$ MeV above the two-neutron decay threshold and widths of $0.32(8)$ and $0.95(15)$ MeV respectively. These were assigned to be the ground ($J^π=0^+$) and first excited ($2^+$) state, with $E_x=1.31(6)$ MeV. The mass excess of $^{16}$Be was thus deduced to be $56.93(13)$ MeV, some $0.5$ MeV more bound than the only previous measurement. Both states were observed to decay by direct two-neutron emission. Calculations incorporating the evolution of the wavefunction during the decay as a genuine three-body process reproduced the principal characteristics of the neutron-neutron energy spectra for both levels, indicating that the ground state exhibits a strong spatially compact dineutron component, while the 2$^+$ level presents a far more diffuse neutron-neutron distribution.
format	Preprint
id	arxiv_https___arxiv_org_abs_2401_16817
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Mass, spectroscopy and two-neutron decay of $^{16}$Be Monteagudo, B. Marqués, F. M. Gibelin, J. Orr, N. A. Corsi, A. Kubota, Y. Casal, J. Gómez-Camacho, J. Authelet, G. Baba, H. Caesar, C. Calvet, D. Delbart, A. Dozono, M. Feng, J. Flavigny, F. Gheller, J. -M. Giganon, A. Gillibert, A. Hasegawa, K. Isobe, T. Kanaya, Y. Kawakami, S. Kim, D. Kiyokawa, Y. Kobayashi, M. Kobayashi, N. Kobayashi, T. Kondo, Y. Korkulu, Z. Koyama, S. Lapoux, V. Maeda, Y. Motobayashi, T. Miyazaki, T. Nakamura, T. Nakatsuka, N. Nishio, Y. Obertelli, A. Ohkura, A. Ota, S. Otsu, H. Ozaki, T. Panin, V. Paschalis, S. Pollacco, E. C. Reichert, S. Rousse, J. -Y. Saito, A. T. Sakaguchi, S. Sako, M. Santamaria, C. Sasano, M. Sato, H. Shikata, M. Shimizu, Y. Shindo, Y. Stuhl, L. Sumikama, T. Sun, Y. L. Tabata, M. Togano, Y. Tsubota, J. Uesaka, T. Yang, Z. H. Yasuda, J. Yoneda, K. Zenihiro, J. Nuclear Experiment Nuclear Theory The structure and decay of the most neutron-rich beryllium isotope, $^{16}$Be, has been investigated following proton knockout from a high-energy $^{17}$B beam. Two relatively narrow resonances were observed for the first time, with energies of $0.84(3)$ and $2.15(5)$ MeV above the two-neutron decay threshold and widths of $0.32(8)$ and $0.95(15)$ MeV respectively. These were assigned to be the ground ($J^π=0^+$) and first excited ($2^+$) state, with $E_x=1.31(6)$ MeV. The mass excess of $^{16}$Be was thus deduced to be $56.93(13)$ MeV, some $0.5$ MeV more bound than the only previous measurement. Both states were observed to decay by direct two-neutron emission. Calculations incorporating the evolution of the wavefunction during the decay as a genuine three-body process reproduced the principal characteristics of the neutron-neutron energy spectra for both levels, indicating that the ground state exhibits a strong spatially compact dineutron component, while the 2$^+$ level presents a far more diffuse neutron-neutron distribution.
title	Mass, spectroscopy and two-neutron decay of $^{16}$Be
topic	Nuclear Experiment Nuclear Theory
url	https://arxiv.org/abs/2401.16817