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Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes

Fuente: arXiv

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Hauptverfasser:	Li, P. J., Lee, J., Doornenbal, P., Chen, S., Wang, S., Obertelli, A., Chazono, Y., Holt, J. D., Hu, B. S., Ogata, K., Utsuno, Y., Yoshida, K., Achouri, N. L., Baba, H., Browne, F., Calvet, D., Château, F., Chiga, N., Corsi, A., Cortés, M. L., Delbart, A., Gheller, J-M., Giganon, A., Gillibert, A., Hilaire, C., Isobe, T., Kobayashi, T., Kubota, Y., Lapoux, V., Liu, H. N., Motobayashi, T., Murray, I., Otsu, H., Panin, V., Paul, N., Rodriguez, W., Sakurai, H., Sasano, M., Steppenbeck, D., Stuhl, L., Sun, Y. L., Togano, Y., Uesaka, T., Wimmer, K., Yoneda, K., Aktas, O., Aumann, T., Boretzky, K., Caesar, C., Chung, L. X., Flavigny, F., Franchoo, S., Gasparic, I., Gerst, R. -B., Gibelin, J., Hahn, K. I., Kahlbow, J., Kim, D., Koiwai, T., Kondo, Y., Körper, D., Koseoglou, P., Lehr, C., Linh, B. D., Lokotko, T., MacCormick, M., Miki, K., Moschner, K., Nakamura, T., Park, S. Y., Rossi, D., Sahin, E., Schindler, F., Simon, H., Söderström, P-A., Sohler, D., Takeuchi, S., Toernqvist, H., Tscheuschner, J., Vaquero, V., Wagner, V., Werner, V., Xu, X., Yamada, H., Yan, D., Yang, Z., Yasuda, M., Zanetti, L.
Format:	Preprint
Veröffentlicht:	2024
Schlagworte:	Nuclear Experiment Nuclear Theory
Online-Zugang:	Acceder al recurso
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author	Li, P. J. Lee, J. Doornenbal, P. Chen, S. Wang, S. Obertelli, A. Chazono, Y. Holt, J. D. Hu, B. S. Ogata, K. Utsuno, Y. Yoshida, K. Achouri, N. L. Baba, H. Browne, F. Calvet, D. Château, F. Chiga, N. Corsi, A. Cortés, M. L. Delbart, A. Gheller, J-M. Giganon, A. Gillibert, A. Hilaire, C. Isobe, T. Kobayashi, T. Kubota, Y. Lapoux, V. Liu, H. N. Motobayashi, T. Murray, I. Otsu, H. Panin, V. Paul, N. Rodriguez, W. Sakurai, H. Sasano, M. Steppenbeck, D. Stuhl, L. Sun, Y. L. Togano, Y. Uesaka, T. Wimmer, K. Yoneda, K. Aktas, O. Aumann, T. Boretzky, K. Caesar, C. Chung, L. X. Flavigny, F. Franchoo, S. Gasparic, I. Gerst, R. -B. Gibelin, J. Hahn, K. I. Kahlbow, J. Kim, D. Koiwai, T. Kondo, Y. Körper, D. Koseoglou, P. Lehr, C. Linh, B. D. Lokotko, T. MacCormick, M. Miki, K. Moschner, K. Nakamura, T. Park, S. Y. Rossi, D. Sahin, E. Schindler, F. Simon, H. Söderström, P-A. Sohler, D. Takeuchi, S. Toernqvist, H. Tscheuschner, J. Vaquero, V. Wagner, V. Werner, V. Xu, X. Yamada, H. Yan, D. Yang, Z. Yasuda, M. Zanetti, L.
author_facet	Li, P. J. Lee, J. Doornenbal, P. Chen, S. Wang, S. Obertelli, A. Chazono, Y. Holt, J. D. Hu, B. S. Ogata, K. Utsuno, Y. Yoshida, K. Achouri, N. L. Baba, H. Browne, F. Calvet, D. Château, F. Chiga, N. Corsi, A. Cortés, M. L. Delbart, A. Gheller, J-M. Giganon, A. Gillibert, A. Hilaire, C. Isobe, T. Kobayashi, T. Kubota, Y. Lapoux, V. Liu, H. N. Motobayashi, T. Murray, I. Otsu, H. Panin, V. Paul, N. Rodriguez, W. Sakurai, H. Sasano, M. Steppenbeck, D. Stuhl, L. Sun, Y. L. Togano, Y. Uesaka, T. Wimmer, K. Yoneda, K. Aktas, O. Aumann, T. Boretzky, K. Caesar, C. Chung, L. X. Flavigny, F. Franchoo, S. Gasparic, I. Gerst, R. -B. Gibelin, J. Hahn, K. I. Kahlbow, J. Kim, D. Koiwai, T. Kondo, Y. Körper, D. Koseoglou, P. Lehr, C. Linh, B. D. Lokotko, T. MacCormick, M. Miki, K. Moschner, K. Nakamura, T. Park, S. Y. Rossi, D. Sahin, E. Schindler, F. Simon, H. Söderström, P-A. Sohler, D. Takeuchi, S. Toernqvist, H. Tscheuschner, J. Vaquero, V. Wagner, V. Werner, V. Xu, X. Yamada, H. Yan, D. Yang, Z. Yasuda, M. Zanetti, L.
contents	The calcium isotopes are an ideal system to investigate the evolution of shell structure and magic numbers. Although the properties of surface nucleons in calcium have been well studied, probing the structure of deeply bound nucleons remains a challenge. Here, we report on the first measurement of unbound states in $^{53}$Ca and $^{55}$Ca, populated from \ts{54,56}Ca($p,pn$) reactions at a beam energy of around 216 MeV/nucleon at the RIKEN Radioactive Isotopes Beam Factory. The resonance properties, partial cross sections, and momentum distributions of these unbound states were analyzed. Orbital angular momentum $l$ assignments were extracted from momentum distributions based on calculations using the distorted wave impulse approximation (DWIA) reaction model. The resonances at excitation energies of 5516(41)\,keV in $^{53}$Ca and 6000(250)\,keV in $^{55}$Ca indicate a significant $l$\, =\,3 component, providing the first experimental evidence for the $ν0f_{7/2}$ single-particle strength of unbound hole states in the neutron-rich Ca isotopes. The observed excitation energies and cross-sections point towards extremely localized and well separated strength distributions, with some fragmentation for the $ν0f_{7/2}$ orbital in $^{55}$Ca. These results are in good agreement with predictions from shell-model calculations using the effective GXPF1Bs interaction and \textit{ab initio} calculations and diverge markedly from the experimental distributions in the nickel isotones at $Z=28$.
format	Preprint
id	arxiv_https___arxiv_org_abs_2407_04529
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes Li, P. J. Lee, J. Doornenbal, P. Chen, S. Wang, S. Obertelli, A. Chazono, Y. Holt, J. D. Hu, B. S. Ogata, K. Utsuno, Y. Yoshida, K. Achouri, N. L. Baba, H. Browne, F. Calvet, D. Château, F. Chiga, N. Corsi, A. Cortés, M. L. Delbart, A. Gheller, J-M. Giganon, A. Gillibert, A. Hilaire, C. Isobe, T. Kobayashi, T. Kubota, Y. Lapoux, V. Liu, H. N. Motobayashi, T. Murray, I. Otsu, H. Panin, V. Paul, N. Rodriguez, W. Sakurai, H. Sasano, M. Steppenbeck, D. Stuhl, L. Sun, Y. L. Togano, Y. Uesaka, T. Wimmer, K. Yoneda, K. Aktas, O. Aumann, T. Boretzky, K. Caesar, C. Chung, L. X. Flavigny, F. Franchoo, S. Gasparic, I. Gerst, R. -B. Gibelin, J. Hahn, K. I. Kahlbow, J. Kim, D. Koiwai, T. Kondo, Y. Körper, D. Koseoglou, P. Lehr, C. Linh, B. D. Lokotko, T. MacCormick, M. Miki, K. Moschner, K. Nakamura, T. Park, S. Y. Rossi, D. Sahin, E. Schindler, F. Simon, H. Söderström, P-A. Sohler, D. Takeuchi, S. Toernqvist, H. Tscheuschner, J. Vaquero, V. Wagner, V. Werner, V. Xu, X. Yamada, H. Yan, D. Yang, Z. Yasuda, M. Zanetti, L. Nuclear Experiment Nuclear Theory The calcium isotopes are an ideal system to investigate the evolution of shell structure and magic numbers. Although the properties of surface nucleons in calcium have been well studied, probing the structure of deeply bound nucleons remains a challenge. Here, we report on the first measurement of unbound states in $^{53}$Ca and $^{55}$Ca, populated from \ts{54,56}Ca($p,pn$) reactions at a beam energy of around 216 MeV/nucleon at the RIKEN Radioactive Isotopes Beam Factory. The resonance properties, partial cross sections, and momentum distributions of these unbound states were analyzed. Orbital angular momentum $l$ assignments were extracted from momentum distributions based on calculations using the distorted wave impulse approximation (DWIA) reaction model. The resonances at excitation energies of 5516(41)\,keV in $^{53}$Ca and 6000(250)\,keV in $^{55}$Ca indicate a significant $l$\, =\,3 component, providing the first experimental evidence for the $ν0f_{7/2}$ single-particle strength of unbound hole states in the neutron-rich Ca isotopes. The observed excitation energies and cross-sections point towards extremely localized and well separated strength distributions, with some fragmentation for the $ν0f_{7/2}$ orbital in $^{55}$Ca. These results are in good agreement with predictions from shell-model calculations using the effective GXPF1Bs interaction and \textit{ab initio} calculations and diverge markedly from the experimental distributions in the nickel isotones at $Z=28$.
title	Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes
topic	Nuclear Experiment Nuclear Theory
url	https://arxiv.org/abs/2407.04529