High-resolution measurement of the time-modulated orbital electron capture and of the $\beta^+$ decay of hydrogen-like $^{142}$Pm$^{60+}$ ions

Kienle, P.; Steck, M.; Sun, B.H.; Bühler, P.; Weick, H.; Atanasov, D.; Dimopoulou, Ch.; Litvinov, S.A.; Mukha, I.; Yan, X.L.; Brandau, C.; Spillmann, U.; Ma, X.W.; Knöbel, R.; Sanjari, M.S.; Hess, R.; Izumikawa, T.; Ohtsubo., T.; Stöhlker, Th.; Faestermann, T.; Ivanova, V.; Tu, X.L.; Nociforo, C.; Yamaguchi, T.; Bosch, F.; Winckler, N.; Nolden, F.; Mazzocco, M.; Scheidenberger, Ch.; Litvinov, Yu.A.; Suzuki, T.; Wang, M.; Geissel, H.; Shubina, D.B.; Kuzminchuk, N.; Kurcewicz, J.; Winters, N.; Lestinsky, M.; Maier, L.; Winters, D.F.A.; Zhang, G.L.; Suzaki, F.; Dillmann, I.; Woods, P.J.; Torilov, S.Yu.; Boutin, D.; Trassinelli, M.; Hillebrand, P.M.

doi:10.1016/j.physletb.2013.09.033

Article
Report number	arXiv:1309.7294
Title	High-resolution measurement of the time-modulated orbital electron capture and of the $\beta^+$ decay of hydrogen-like $^{142}$Pm$^{60+}$ ions
Author(s)	Kienle, P. (Munich, Tech. U.) ; Bosch, F. (Darmstadt, GSI) ; Bühler, P. (Stefan Meyer Inst. Subatomare Phys.) ; Faestermann, T. (Munich, Tech. U.) ; Litvinov, Yu.A. (Darmstadt, GSI ; Heidelberg, Max Planck Inst. ; Heidelberg U.) ; Sanjari, M.S. (Darmstadt, GSI ; Frankfurt U. ; Darmstadt, EMMI) ; Shubina, D.B. (Heidelberg, Max Planck Inst. ; Heidelberg U.) ; Winckler, N. (Darmstadt, GSI ; Heidelberg, Max Planck Inst.) ; Atanasov, D. (Darmstadt, GSI ; Heidelberg, Max Planck Inst. ; Heidelberg U.) ; Geissel, H. (Darmstadt, GSI ; Giessen U.) ; Ivanova, V. (Darmstadt, GSI) ; Yan, X.L. (Heidelberg, Max Planck Inst. ; Lanzhou, Inst. Modern Phys.) ; Boutin, D. (Darmstadt, GSI ; SPhN, DAPNIA, Saclay) ; Brandau, C. (Darmstadt, GSI ; Darmstadt, EMMI ; Giessen U.) ; Dillmann, I. (Darmstadt, GSI ; Giessen U.) ; Dimopoulou, Ch. (Darmstadt, GSI) ; Hess, R. (Darmstadt, GSI ; Darmstadt, EMMI) ; Hillebrand, P.M. (Darmstadt, GSI ; Giessen U.) ; Izumikawa, T. (Niigata U.) ; Knöbel, R. (Darmstadt, GSI ; Giessen U.) ; Kurcewicz, J. (Darmstadt, GSI ; CERN) ; Kuzminchuk, N. (Giessen U.) ; Lestinsky, M. (Darmstadt, GSI) ; Litvinov, S.A. (Darmstadt, GSI) ; Ma, X.W. (Lanzhou, Inst. Modern Phys.) ; Maier, L. (Munich, Tech. U.) ; Mazzocco, M. (Darmstadt, GSI ; INFN, Padua) ; Mukha, I. (Darmstadt, GSI) ; Nociforo, C. (Darmstadt, GSI) ; Nolden, F. (Darmstadt, GSI) ; Scheidenberger, Ch. (Darmstadt, GSI ; Giessen U.) ; Spillmann, U. (Darmstadt, GSI) ; Steck, M. (Darmstadt, GSI) ; Stöhlker, Th. (Darmstadt, GSI ; Jena U. ; Helmholtz Inst., Jena) ; Sun, B.H. (Darmstadt, GSI ; Giessen U. ; BeiHang U.) ; Suzaki, F. (Saitama U.) ; Suzuki, T. (Saitama U.) ; Torilov, S.Yu. (St. Petersburg State U.) ; Trassinelli, M. (Darmstadt, GSI ; Paris U., VI, LPTL) ; Tu, X.L. (Darmstadt, GSI ; Lanzhou, Inst. Modern Phys.) ; Wang, M. (Heidelberg, Max Planck Inst. ; Lanzhou, Inst. Modern Phys.) ; Weick, H. (Darmstadt, GSI) ; Winters, D.F.A. (Darmstadt, GSI) ; Winters, N. (Darmstadt, GSI ; Heidelberg U.) ; Woods, P.J. (Edinburgh U.) ; Yamaguchi, T. (Saitama U.) ; Zhang, G.L. (BeiHang U.) ; Ohtsubo., T. (Niigata U.)
Publication	2013-11-04
Imprint	27 Sep 2013
Number of pages	8
Note	Comments: In memoriam of Prof. Paul Kienle, 9 pages, 1 table, 5 figures Phys. Lett. B (2013) online In memoriam of Prof. Paul Kienle, 9 pages, 1 table, 5 figures Phys. Lett. B (2013) online
In:	Phys. Lett. B 726 (2013) 638-645
DOI	10.1016/j.physletb.2013.09.033
Subject category	Nuclear Physics - Experiment
Abstract	The periodic time modulations, found recently in the two-body orbital electron-capture (EC) decay of both, hydrogen-like $^{140}$Pr$^{58+}$ and $^{142}$Pm$^{60+}$ ions, with periods near to 7s and amplitudes of about 20%, were re-investigated for the case of $^{142}$Pm$^{60+}$ by using a 245 MHz resonator cavity with a much improved sensitivity and time resolution. We observed that the exponential EC decay is modulated with a period $T = 7.11(11)$s, in accordance with a modulation period $T = 7.12(11)$ s as obtained from simultaneous observations with a capacitive pick-up, employed also in the previous experiments. The modulation amplitudes amount to $a_R = 0.107(24)$ and $a_P = 0.134(27)$ for the 245 MHz resonator and the capacitive pick-up, respectively. These new results corroborate for both detectors {\it exactly} our previous findings of modulation periods near to 7s, though with {\it distinctly smaller} amplitudes. Also the three-body $\beta^+$ decays have been analyzed. For a supposed modulation period near to 7s we found an amplitude $a = 0.027(27)$, compatible with $a = 0$ and in agreement with the preliminary result $a = 0.030(30)$ of our previous experiment. These observations could point at weak interaction as origin of the observed 7s-modulation of the EC decay. Furthermore, the data suggest that interference terms occur in the two-body EC decay, although the neutrinos are not directly observed.
Copyright/License	Elsevier B.V. (License: arXiv nonexclusive-distrib. 1.0)

$(Color online) Traces of two cooled $^{142}$Pm$^{60+}$ parent ions, recorded at the 124$^{\rm th}$ harmonic of the revolution frequency by the 245~MHz resonator vs. the time after injection, with time- and frequency-binning of 32~ms and 31.25~Hz, respectively. Both parent H-like $^{142}$Pm$^{60+}$ ions decay by EC to bare $^{142}$Nd$^{60+}$ daughter ions accompanied by the emission of a ``monoenergetic'' electron neutrino $\nu_e$. The yellow arrows indicate the true decay times, as unambiguously identified by a decrease of the intensity of the trace of the parent ions and the {\it simultaneous} onset of the trace of the recoiling daughter ion. The latter starts at a revolution frequency shifted by $\Delta f$ with respect to the frequency after completion of electron cooling, which reflects the projection of the recoil velocity onto the beam direction axis immediately after the decay.$ $Number of EC decays per 0.96~s of H-like $^{142}$Pm$^{60+}$ ions, recorded by the 245~MHz resonator, vs. the time after injection of the ions into the storage ring ESR. Displayed are also the exponential fit according to Eq. (\ref{eq:eq1}) and the modulation fit according to Eq.~(\ref{eq:eq2}). The inset shows the $\chi^2$ values vs. the angular frequency $\omega$, for a fixed total decay constant $\lambda$ and a variation of amplitude $a$ and phase $\phi$ .$ $Number of EC decays per 0.96~s of H-like $^{142}$Pm$^{60+}$ ions, recorded by the capacitive pick-up, vs. the time after injection of the ions into the storage ring ESR. Displayed are also the exponential fit according to Eq. (\ref{eq:eq1}) and the modulation fit according to Eq.~(\ref{eq:eq2}). The inset shows the $\chi^2$ values vs. the angular frequency $\omega$, for a fixed total decay constant $\lambda$ and a variation of amplitude $a$ and phase $\phi$.$ Show more plots

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Записът е създаден на 2013-09-30, последна промяна на 2024-05-08

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