Spectroscopy of excited states of unbound nuclei Ar 30 and Cl 29

X. D. Xu, I. Mukha, L. V. Grigorenko, C. Scheidenberger, L. Acosta, E. Casarejos, V. Chudoba, A. A. Ciemny, W. Dominik, J. Duénas-Díaz, V. Dunin, J. M. Espino, A. Estradé, F. Farinon, A. Fomichev, H. Geissel, T. A. Golubkova, A. Gorshkov, Z. Janas, G. KamińskiO. Kiselev, R. Knöbel, S. Krupko, M. Kuich, Yu A. Litvinov, G. Marquinez-Durán, I. Martel, C. Mazzocchi, C. Nociforo, A. K. Ordúz, M. Pfützner, S. Pietri, M. Pomorski, A. Prochazka, S. Rymzhanova, A. M. Sánchez-Benítez, P. Sharov, H. Simon, B. Sitar, R. Slepnev, M. Stanoiu, P. Strmen, I. Szarka, M. Takechi, Y. K. Tanaka, H. Weick, M. Winkler, J. S. Winfield

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Several states of proton-unbound isotopes Ar30 and Cl29 were investigated by measuring their in-flight decay products, S28 + proton + proton and S28 + proton, respectively. A refined analysis of S28-proton angular correlations indicates that the ground state of Ar30 is located at 2.45-0.10+0.05 MeV above the two-proton emission threshold. The investigation of the decay mechanism of the Ar30 ground state demonstrates that it has the transition dynamics. In the "transitional" region, the correlation patterns of the decay products present a surprisingly strong sensitivity to the two-proton decay energy of the Ar30 ground state and the one-proton decay energy as well as the one-proton decay width of the Cl29 ground state. The comparison of the experimental S28-proton angular correlations with those resulting from Monte Carlo simulations of the detector response illustrates that other observed Ar30 excited states decay by sequential emission of protons via intermediate resonances in Cl29. Based on the findings, the decay schemes of the observed states in Ar30 and Cl29 were constructed. For calibration purposes and for checking the performance of the experimental setup, decays of the previously known states of a two-proton emitter Mg19 were remeasured. Evidences for one new excited state in Mg19 and two unknown states in Na18 were found.

Original languageEnglish
Article number034305
JournalPhysical Review C
Issue number3
StatePublished - Mar 5 2018


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