Journal Article

GSI-2018-00491

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Spectroscopy of excited states of unbound nuclei $^{30}$Ar and $^{29}$Cl

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

2018
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevC.97.034305

Abstract: Several states of proton-unbound isotopes $^{30}$Ar and $^{29}$Cl were investigated by measuring their in-flight decay products, $^{28}$S+proton+proton and $^{28}$S+proton, respectively. A refined analysis of $^{28}$S-proton angular correlations indicates that the ground state of $^{30}$Ar is located at $2.45^{+0.05}_{-0.10}$ MeV above the two-proton emission threshold. The theoretical investigation of the $^{30}$Ar ground state decay demonstrates that its mechanism has the transition dynamics with a surprisingly strong sensitivity of the correlation patterns of the decay products to the two-proton decay energy of the $^{30}$Ar ground state and the one-proton decay energy as well as the one-proton decay width of the $^{29}$Cl ground state. The comparison of the experimental $^{28}$S-proton angular correlations with those resulting from Monte Carlo simulations of the detector response illustrates that other observed $^{30}$Ar excited states decay by sequential emission of protons via intermediate resonances in $^{29}$Cl. Based on the findings, the decay schemes of the observed states in $^{30}$Ar and $^{29}$Cl 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 $^{19}$Mg were remeasured. Evidences for one new excited state in $^{19}$Mg and two unknown states in $^{18}$Na were found.

Note: 17 pages, 16 figures

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Contributing Institute(s):

1. Atomphysik (ATP)
2. Collaboration GSI: NUSTAR (NUSTAR@GSI)
3. FRS / SFRS Experimente (FRS)
4. Kernreaktionen (KRA)
5. ExtreMe Matter Institute (EMMI) (EXM)
6. SuperFRS Experiment Collaboration (SuperFRS-EC@FAIR)

Research Program(s):

1. 6211 - Extreme States of Matter: From Cold Ions to Hot Plasmas (POF3-621) (POF3-621)

Appears in the scientific report 2018

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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