Phys.Rev. C 97, 034305 (2018)

X.-D.Xu, I.Mukha, L.V.Grigorenko, C.Scheidenberger, L.Acosta, E.Casarejos, V.Chudoba, A.A.Ciemny, W.Dominik, J.Duenas-Diaz, V.Dunin, J.M.Espino, A.Estrade, F.Farinon, A.Fomichev, H.Geissel, T.A.Golubkova, A.Gorshkov, Z.Janas, G.Kaminski, O.Kiselev, R.Knobel, S.Krupko, M.Kuich, Yu.A.Litvinov, G.Marquinez-Duran, I.Martel, C.Mazzocchi, C.Nociforo, A.K.Orduz, M.Pfutzner, S.Pietri, M.Pomorski, A.Prochazka, S.Rymzhanova, A.M.Sanchez-Benitez, 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

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

NUCLEAR REACTIONS ⁹Be(³¹Ar, ³⁰Ar), (²⁰Mg, ¹⁹Mg), E=620 MeV/nucleon, [secondary ³¹Ar and ²⁰Mg beams from ⁹Be(³⁶Ar, X), E=885 MeV/nucleon followed by separation of ³¹Ar fragments using FRS at GSI]; measured reaction products, A/Q versus Z yield distributions, proton spectra, trajectories of in-flight decay products ²⁸S+p+p, ²⁸S+p, ¹⁷Ne+p+p, (²⁸Si)pp-, (²⁹Cl)p-, and (¹⁷Ne)pp-coin, (²⁸Si)p(θ) and (¹⁷Ne)p(θ) from 2p-decays of states in ³⁰Ar and ¹⁹Mg. ³⁰Ar, ²⁹Cl, ²⁸S, ¹⁹Mg, ¹⁸Na; deduced ground states and unbound levels, two-proton decay widths of ³⁰Ar and ¹⁹Mg ground states; discussed simultaneous and sequential two-proton decays from ground and excited states of ³⁰Ar and ¹⁹Mg, Thomas-Ehrman effect in ²⁹Cl-²⁹Mg and ³⁰Mg-³⁰Ar mirror partners. Comparison with shell-model predictions.

RADIOACTIVITY ³⁰Ar, ¹⁹Mg(2p)[from ⁹Be(³¹Ar, ³⁰Ar), (²⁰Mg, ¹⁹Mg) reactions at GSI]; measured proton spectra; deduced ground state of ³⁰Ar above the two-proton emission threshold.

doi: 10.1103/PhysRevC.97.034305