/ nucl-ex arXiv:1612.04697


Search for $2p$ decay of the first excited state of $^{17}$Ne


Sharov, P.G. (Moscow, KSRS) ; Bezbakh, A.A. (Moscow, KSRS) ; Chudoba, V. (Moscow State U.) ; Egorova, I.A. (Moscow, KSRS) ; Fomichev, A.S. (Moscow State U.) ; Golovkov, M.S. (Moscow State U.) ; Golubkova, T.A. (Moscow State U.) ; Gorshkov, A.V. (Moscow, KSRS) ; Grigorenko, L.V. (Moscow Phys. Eng. Inst.) ; Kaminski, G. (Cracow, INP) ; Knyazev, A.G. (Moscow, KSRS) ; Krupko, S.A. (Moscow, KSRS) ; Mentel, M. (AGH-UST, Cracow) ; Nikolskii, E.Yu. (Dubna, JINR) ; Parfenova, Yu.L. (Dubna, JINR) ; Pluchinski, P. (AGH-UST, Cracow) ; Rymzhanova, S.A. (Moscow, KSRS) ; Sidorchuk, S.I. (Dubna, JINR) ; Slepnev, R.S. (Dubna, JINR) ; Stepantsov, S.V. (Dubna, JINR) ; Ter-Akopian, G.M. (Moscow State U.) ; Wolski, R. (Cracow, INP) ; Zhukov, M.V. (Goteborg, ITP)

Abstract: Two-proton decay of the $^{17}$Ne low-lying states populated in the $^{1}$H$(^{18}$Ne,$d)^{17}$Ne transfer reaction was studied. The two-proton width \(\Gamma_{2p}\) of the $^{17}$Ne first excited $3/2^-$ state at 1.288 MeV is of importance for the two-proton radioactivity theory and nuclear-astrophysics applications. Dedicated search for the two-proton emission of this state was performed leading to the new upper limit obtained for the width ratio $\Gamma_{2p}/\Gamma_{\gamma} < 2.5 \times 10^{-4}$. A novel, "combined mass" method is suggested and tested capable to improve the resolution of the experiment which is a prime significance for the study of nuclear states with extreme small particle-to-gamma width ratios $\Gamma_{\mathrm{part}}/\Gamma_{\gamma}$. The condition $\Gamma_{\mathrm{part}} \ll \Gamma_{\gamma}$ is quite common for the states of astrophysical interest which makes the proposed approach prospective in this field.

Web-Page: http://inspirehep.net/record/1503443/files/masses.png; http://inspirehep.net/record/1503443/files/cm-mm.png; http://inspirehep.net/record/1503443/files/scm.png; http://inspirehep.net/record/1503443/files/setup.png; http://inspirehep.net/record/1503443/files/mm-thn.png; http://inspirehep.net/record/1503443/files/2p.png; http://inspirehep.net/record/1503443/files/arXiv:1612.04697.pdf; http://inspirehep.net/record/1503443/files/sense.png


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