Observation and spectroscopy of proton-unbound nucleus $^{21}$Al

arXiv - PHYS - Nuclear Experiment Pub Date : 2024-06-07 DOI:arxiv-2406.04771

D. Kostyleva, X. -D. Xu, I. Mukha, L. Acosta, M. Bajzek, E. Casarejos, A. A. Ciemny, D. Cortina-Gil, W. Dominik, J. A. Dueñas, J. M. Espino, A. Estradé, F. Farinon, A. Fomichev, H. Geissel, J. Gómez-Camacho, A. Gorshkov, L. V. Grigorenko, Z. Janas, G. Kamiński, O. Kiselev, R. Knöbel, A. A. Korsheninnikov, S. Krupko, M. Kuich, N. Kurz, Yu. A. Litvinov, G. Marquinez-Durán, I. Martel, C. Mazzocchi, E. Yu. Nikolskii, C. Nociforo, A. K. Ordúz, M. Pfützner, S. Pietri, M. Pomorski, A. Prochazka, C. Rodríguez-Tajes, S. Rymzhanova, A. M. Sánchez-Benítez, C. Scheidenberger, H. Simon, B. Sitar, R. Slepnev, M. Stanoiu, P. Strmen, K. Sümmerer, I. Szarka, M. Takechi, Y. K. Tanaka, H. Weick, J. S. Winfield, P. J. Woods, M. V. Zhukov

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Abstract

We report on the observation of previously-unknown isotope $^{21}$Al, the first unbound aluminum isotope located beyond the proton dripline. The $^{21}$Al nucleus decays by one-proton (1p) emission, and its in-flight decays were detected by tracking trajectories of all decay products with micro-strip silicon detectors. The 1p-emission processes were studied by analyses of the measured angular correlations of decay products $^{20}$Mg+p. The 1p-decay energies of ground and low-lying excited states of $^{21}$Al, its mass excess and proton separation energy value $S_p$=$-1.1(1)$ MeV were determined.

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质子未结合核 $^{21}$Al 的观测与光谱学

我们报告了对以前未知的同位素$^{21}$Al的观测结果，这是第一个位于质子滴线以外的非束缚铝同位素。^{21}$Al核通过一质子（1p）发射衰变，其飞行中的衰变是通过使用微带硅探测器跟踪所有衰变产物的轨迹而探测到的。通过分析衰变产物 $^{20}$Mg+p 的主题测量角相关性，对 1p 发射过程进行了研究。确定了 $^{21}$Al 的基态和低洼激发态的 1p 衰变能量、其质量过量和质子分离能值 $S_p$=$-1.1(1)$ MeV。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - Nuclear Experiment

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