319 results on '"Sonnabend, K."'
Search Results
2. Structure of high-lying levels populated in the $^{96}$Y $\rightarrow ^{96}$Zr $\beta$ decay
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Mashtakov, K. R., Ponomarev, V. Yu., Scheck, M., Finch, S. W., Isaak, J., Zweidinger, M., Agar, O., Bathia, C., Beck, T., Beller, J., Bowry, M., Chapman, R., Chisthi, M. M. R., Friman-Gayer, U., Gaffney, L. P., Garrett, P. E., Gregor, E. T., Keatings, J. M., Köster, U., Löher, B., McLean, A. D., O'Donnell, D., Pai, H., Pietralla, N., Rainovski, G., Ramdhane, M., Romig, C., Rusev, G., Savran, D., Simpson, G. S., Sinclair, J., Sonnabend, K., Spagnoletti, P., Tonchev, A. P., and Tornow, W.
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Nuclear Experiment - Abstract
The nature of $J^{\pi}=1^-$ levels of $^{96}$Zr below the $\beta$-decay $Q_{\beta}$ value of $^{96}$Y has been investigated in high-resolution $\gamma$-ray spectroscopy following the $\beta$ decay as well as in a campaign of inelastic photon scattering experiments. Branching ratios extracted from $\beta$ decay allow the absolute $E1$ excitation strength to be determined for levels populated in both reactions. The combined data represents a comprehensive approach to the wavefunction of $1^-$ levels below the $Q_{\beta}$ value, which are investigated in the theoretical approach of the Quasiparticle Phonon Model. This study clarifies the nuclear structure properties associated with the enhanced population of high-lying levels in the $^{96}$Y$_{gs}$ $\beta$ decay, one of the three most important contributors to the high-energy reactor antineutrino spectrum.
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- 2020
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3. Sensitivity study for s process nucleosynthesis in AGB stars
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Koloczek, A., Thomas, B., Glorius, J., Plag, R., Pignatari, M., Reifarth, R., Ritter, C., Schmidt, S., and Sonnabend, K.
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Astrophysics - Solar and Stellar Astrophysics - Abstract
In this paper we present a large-scale sensitivity study of reaction rates in the main component of the $s$ process. The aim of this study is to identify all rates, which have a global effect on the $s$ process abundance distribution and the three most important rates for the production of each isotope. We have performed a sensitivity study on the radiative $^{13}$C-pocket and on the convective thermal pulse, sites of the $s$ process in AGB stars. We identified 22 rates, which have the highest impact on the $s$-process abundances in AGB stars., Comment: 22 pages, 4 figures
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- 2016
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4. The thermal neutron capture cross section of the radioactive isotope $^{60}$Fe
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Heftrich, T., Bichler, M., Dressler, R., Eberhardt, K., Endres, A., Glorius, J., Göbel, K., Hampel, G., Heftrich, M., Käppeler, F., Lederer, C., Mikorski, M., Plag, R., Reifarth, R., Stieghorst, C., Schmidt, S., Schumann, D., Slavkovská, Z., Sonnabend, K., Wallner, A., Weigand, M., Wiehl, N., and Zauner, S.
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Nuclear Experiment ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
50% of the heavy element abundances are produced via slow neutron capture reactions in different stellar scenarios. The underlying nucleosynthesis models need the input of neutron capture cross sections. One of the fundamental signatures for active nucleosynthesis in our galaxy is the observation of long-lived radioactive isotopes, such as $^{60}$Fe with a half-life of $2.60\times10^6$ yr. To reproduce this $\gamma$-activity in the universe, the nucleosynthesis of $^{60}$Fe has to be understood reliably. A $^{60}$Fe sample produced at the Paul-Scherrer-Institut was activated with thermal and epithermal neutrons at the research reactor at the Johannes Gutenberg-Universit\"at Mainz. The thermal neutron capture cross section has been measured for the first time to $\sigma_{\text{th}}=0.226 \ (^{+0.044}_{-0.049})$ b. An upper limit of $\sigma_{\text{RI}} < 0.50$ b could be determined for the resonance integral. An extrapolation towards the astrophysicaly interesting energy regime between $kT$=10 keV and 100 keV illustrates that the s-wave part of the direct capture component can be neglected., Comment: 8 pages, 8 Figs, accepted for publication at PRC
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- 2015
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5. The 106Cd(alpha,alpha)106Cd elastic scattering in a wide energy range for gamma-process studies
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Ornelas, A., Kiss, G. G., Mohr, P., Galaviz, D., Fülöp, Zs., Gyürky, Gy., Máté, Z., Rauscher, T., Somorjai, E., Sonnabend, K., and Zilges, A.
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Nuclear Experiment - Abstract
Alpha elastic scattering angular distributions of the 106Cd(alpha,alpha)106Cd reaction were measured at three energies around the Coulomb barrier to provide a sensitive test for the alpha + nucleus optical potential parameter sets. Furthermore, the new high precision angular distributions, together with the data available from the literature were used to study the energy dependence of the locally optimized {\alpha}+nucleus optical potential in a wide energy region ranging from E_Lab = 27.0 MeV down to 16.1 MeV. The potentials under study are a basic prerequisite for the prediction of alpha-induced reaction cross sections and thus, for the calculation of stellar reaction rates used for the astrophysical gamma process. Therefore, statistical model predictions using as input the optical potentials discussed in the present work are compared to the available 106Cd + alpha cross section data.
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- 2015
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6. Cross-section measurement of the $^{130}$Ba(p,$\gamma$)$^{131}$La reaction for $\gamma$-process nucleosynthesis
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Netterdon, L., Endres, A., Kiss, G. G., Mayer, J., Rauscher, T., Scholz, P., Sonnabend, K., Török, Zs., and Zilges, A.
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Nuclear Experiment - Abstract
A measurement of total cross-section values of the $^{130}$Ba(p,$\gamma$)$^{131}$La reaction at low proton energies allows a stringent test of statistical model predictions with different proton+nucleus optical model potentials. Since no experimental data are available for proton-capture reactions in this mass region around A~$\approx$~130, this measurement can be an important input to test the global applicability of proton+nucleus optical model potentials. The total reaction cross-section values were measured by means of the activation method. After the irradiation with protons, the reaction yield was determined by use of $\gamma$-ray spectroscopy using two clover-type high-purity germanium detectors. In total, cross-section values for eight different proton energies could be determined in the energy range between 3.6 MeV $\leq E_p \leq$ 5.0 MeV, thus, inside the astrophysically relevant energy region. The measured cross-section values were compared to Hauser-Feshbach calculations using the statistical model codes TALYS and SMARAGD with different proton+nucleus optical model potentials. With the semi-microscopic JLM proton+nucleus optical model potential used in the SMARAGD code, the absolute cross-section values are reproduced well, but the energy dependence is too steep at the lowest energies. The best description is given by a TALYS calculation using the semi-microscopic Bauge proton+nucleus optical model potential using a constant renormalization factor., Comment: 7 pages, 6 figures
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- 2014
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7. Measurement of the 92,93,94,100Mo(g,n) reactions by Coulomb Dissociation
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Göbel, K., Adrich, P., Altstadt, S., Alvarez-Pol, H., Aksouh, F., Aumann, T., Babilon, M., Behr, K-H., Benlliure, J., Berg, T., Böhmer, M., Boretzky, K., Brünle, A., Beyer, R., Casarejos, E., Chartier, M., Cortina-Gil, D., Chatillon, A., Pramanik, U. Datta., Deveaux, L., Elvers, M., Elze, T. W., Emling, H., Erhard, M., Ershova, O., Fernandez-Dominguez, B., Geissel, H., Górska, M., Heftrich, T., Heil, M., Hellstroem, M., Ickert, G., Johansson, H., Junghans, A. R., Käppeler, F., Kiselev, O., Klimkiewicz, A., Kratz, J. V., Kulessa, R., Kurz, N., Labiche, M., Langer, C., Bleis, T. Le., Lemmon, R., Lindenberg, K., Litvinov, Y. A., Maierbeck, P., Movsesyan, A., Müller, S., Nilsson, T., Nociforo, C., Paar, N., Palit, R., Paschalis, S., Plag, R., Prokopowicz, W., Reifarth, R., Rossi, D. M., Schnorrenberger, L., Simon, H., Sonnabend, K., Sümmerer, K., Surówka, G., Vretenar, D., Wagner, A., Walter, S., Waluś, W., Wamers, F., Weick, H., Weigand, M., Winckler, N., Winkler, M., and Zilges, A.
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Astrophysics - Instrumentation and Methods for Astrophysics ,Nuclear Experiment ,Nuclear Theory - Abstract
The Coulomb Dissociation (CD) cross sections of the stable isotopes 92,94,100Mo and of the unstable isotope 93Mo were measured at the LAND/R3B setup at GSI Helmholtzzentrum f\"ur Schwerionenforschung in Darmstadt, Germany. Experimental data on these isotopes may help to explain the problem of the underproduction of 92,94Mo and 96,98Ru in the models of p-process nucleosynthesis. The CD cross sections obtained for the stable Mo isotopes are in good agreement with experiments performed with real photons, thus validating the method of Coulomb Dissociation. The result for the reaction 93Mo(g,n) is especially important since the corresponding cross section has not been measured before. A preliminary integral Coulomb Dissociation cross section of the 94Mo(g,n) reaction is presented. Further analysis will complete the experimental database for the (g,n) production chain of the p-isotopes of molybdenum., Comment: Talk given at the Conference Nuclear Physice in Astrophysics VI (NPA6), Lisbon, Portugal, May 19-24 2013. To appear in the NPA6 Proceedings in Journal of Physics: Conference Series (JPCS). 6 pages, 6 figures
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- 2013
8. Neutron activation of natural zinc samples at kT = 25 keV
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Reifarth, R., Dababneh, S., Heil, M., Käppeler, F., Plag, R., Sonnabend, K., and Uberseder, E.
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Astrophysics - Instrumentation and Methods for Astrophysics ,Nuclear Experiment - Abstract
The neutron-capture cross sections of 64Zn, 68Zn, and 70Zn have been measured with the activation technique in a quasistellar neutron spectrum corresponding to a thermal energy of kT = 25 keV. By a series of repeated irradiations with different experimental conditions, an uncertainty of 3% could be achieved for the 64Zn(n,g)65Zn cross section and for the partial cross section 68Zn(n,g)69Zn-m feeding the isomeric state in 69Zn. For the partial cross sections 70Zn(n,g)71Zn-m and 70Zn(n,g)71Zn-g, which had not been measured so far, uncertainties of only 16% and 6% could be reached because of limited counting statistics and decay intensities. Compared to previous measurements on 64,68Zn, the uncertainties could be significantly improved, while the 70Zn cross section was found to be two times smaller than existing model calculations. From these results Maxwellian average cross sections were determined between 5 and 100 keV. Additionally, the beta-decay half-life of 71Zn-m could be determined with significantly improved accuracy. The consequences of these data have been studied by network calculations for convective core He burning and convective shell C burning in massive stars.
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- 2013
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9. Nuclear astrophysics with radioactive ions at FAIR
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Reifarth, R., Altstadt, S., Göbel, K., Heftrich, T., Heil, M., Koloczek, A., Langer, C., Plag, R., Pohl, M., Sonnabend, K., Weigand, M., Adachi, T., Aksouh, F., Al-Khalili, J., AlGarawi, M., AlGhamdi, S., Alkhazov, G., Alkhomashi, N., Alvarez-Pol, H., Alvarez-Rodriguez, R., Andreev, V., Andrei, B., Atar, L., Aumann, T., Avdeichikov, V., Bacri, C., Bagchi, S., Barbieri, C., Beceiro, S., Beck, C., Beinrucker, C., Belier, G., Bemmerer, D., Bendel, M., Benlliure, J., Benzoni, G., Berjillos, R., Bertini, D., Bertulani, C., Bishop, S., Blasi, N., Bloch, T., Blumenfeld, Y., Bonaccorso, A., Boretzky, K., Botvina, A., Boudard, A., Boutachkov, P., Boztosun, I., Bracco, A., Brambilla, S., Monago, J. Briz, Caamano, M., Caesar, C., Camera, F., Casarejos, E., Catford, W., Cederkall, J., Cederwall, B., Chartier, M., Chatillon, A., Cherciu, M., Chulkov, L., Coleman-Smith, P., Cortina-Gil, D., Crespi, F., Crespo, R., Cresswell, J., Csatlós, M., Déchery, F., Davids, B., Davinson, T., Derya, V., Detistov, P., Fernandez, P. Diaz, DiJulio, D., Dmitry, S., Doré, D., Duenas, J., Dupont, E., Egelhof, P., Egorova, I., Elekes, Z., Enders, J., Endres, J., Ershov, S., Ershova, O., Fernandez-Dominguez, B., Fetisov, A., Fiori, E., Fomichev, A., Fonseca, M., Fraile, L., Freer, M., Friese, J., Borge, M. G., Redondo, D. Galaviz, Gannon, S., Garg, U., Gasparic, I., Gasques, L., Gastineau, B., Geissel, H., Gernhäuser, R., Ghosh, T., Gilbert, M., Glorius, J., Golubev, P., Gorshkov, A., Gourishetty, A., Grigorenko, L., Gulyas, J., Haiduc, M., Hammache, F., Harakeh, M., Hass, M., Heine, M., Hennig, A., Henriques, A., Herzberg, R., Holl, M., Ignatov, A., Ignatyuk, A., Ilieva, S., Ivanov, M., Iwasa, N., Jakobsson, B., Johansson, H., Jonson, B., Joshi, P., Junghans, A., Jurado, B., Körner, G., Kalantar, N., Kanungo, R., Kelic-Heil, A., Kezzar, K., Khan, E., Khanzadeev, A., Kiselev, O., Kogimtzis, M., Körper, D., Kräckmann, S., Kröll, T., Krücken, R., Krasznahorkay, A., Kratz, J., Kresan, D., Krings, T., Krumbholz, A., Krupko, S., Kulessa, R., Kumar, S., Kurz, N., Kuzmin, E., Labiche, M., Langanke, K., Lazarus, I., Bleis, T. Le, Lederer, C., Lemasson, A., Lemmon, R., Liberati, V., Litvinov, Y., Löher, B., Herraiz, J. Lopez, Münzenberg, G., Machado, J., Maev, E., Mahata, K., Mancusi, D., Marganiec, J., Perez, M. Martinez, Marusov, V., Mengoni, D., Million, B., Morcelle, V., Moreno, O., Movsesyan, A., Nacher, E., Najafi, M., Nakamura, T., Naqvi, F., Nikolski, E., Nilsson, T., Nociforo, C., Nolan, P., Novatsky, B., Nyman, G., Ornelas, A., Palit, R., Pandit, S., Panin, V., Paradela, C., Parkar, V., Paschalis, S., Pawłowski, P., Perea, A., Pereira, J., Petrache, C., Petri, M., Pickstone, S., Pietralla, N., Pietri, S., Pivovarov, Y., Potlog, P., Prokofiev, A., Rastrepina, G., Rauscher, T., Ribeiro, G., Ricciardi, M., Richter, A., Rigollet, C., Riisager, K., Rios, A., Ritter, C., Frutos, T. Rodríguez, Vignote, J. Rodriguez, Röder, M., Romig, C., Rossi, D., Roussel-Chomaz, P., Rout, P., Roy, S., Söderström, P., Sarkar, M. Saha, Sakuta, S., Salsac, M., Sampson, J., Saez, J. Sanchez del Rio, Rosado, J. Sanchez, Sanjari, S., Sarriguren, P., Sauerwein, A., Savran, D., Scheidenberger, C., Scheit, H., Schmidt, S., Schmitt, C., Schnorrenberger, L., Schrock, P., Schwengner, R., Seddon, D., Sherrill, B., Shrivastava, A., Sidorchuk, S., Silva, J., Simon, H., Simpson, E., Singh, P., Slobodan, D., Sohler, D., Spieker, M., Stach, D., Stan, E., Stanoiu, M., Stepantsov, S., Stevenson, P., Strieder, F., Stuhl, L., Suda, T., Sümmerer, K., Streicher, B., Taieb, J., Takechi, M., Tanihata, I., Taylor, J., Tengblad, O., Ter-Akopian, G., Terashima, S., Teubig, P., Thies, R., Thoennessen, M., Thomas, T., Thornhill, J., Thungstrom, G., Timar, J., Togano, Y., Tomohiro, U., Tornyi, T., Tostevin, J., Townsley, C., Trautmann, W., Trivedi, T., Typel, S., Uberseder, E., Udias, J., Uesaka, T., Uvarov, L., Vajta, Z., Velho, P., Vikhrov, V., Volknandt, M., Volkov, V., von Neumann-Cosel, P., von Schmid, M., Wagner, A., Wamers, F., Weick, H., Wells, D., Westerberg, L., Wieland, O., Wiescher, M., Wimmer, C., Wimmer, K., Winfield, J. S., Winkel, M., Woods, P., Wyss, R., Yakorev, D., Yavor, M., Cardona, J. Zamora, Zartova, I., Zerguerras, T., Zgura, I., Zhdanov, A., Zhukov, M., Zieblinski, M., Zilges, A., and Zuber, K.
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Astrophysics - Instrumentation and Methods for Astrophysics ,Nuclear Experiment - Abstract
The nucleosynthesis of elements beyond iron is dominated by neutron captures in the s and r processes. However, 32 stable, proton-rich isotopes cannot be formed during those processes, because they are shielded from the s-process flow and r-process beta-decay chains. These nuclei are attributed to the p and rp process. For all those processes, current research in nuclear astrophysics addresses the need for more precise reaction data involving radioactive isotopes. Depending on the particular reaction, direct or inverse kinematics, forward or time-reversed direction are investigated to determine or at least to constrain the desired reaction cross sections. The Facility for Antiproton and Ion Research (FAIR) will offer unique, unprecedented opportunities to investigate many of the important reactions. The high yield of radioactive isotopes, even far away from the valley of stability, allows the investigation of isotopes involved in processes as exotic as the r or rp processes., Comment: Invited Talk given at the Conference Nuclear Physice in Astrophysics VI (NPA6), Lisbon, Portugal, May 19-24 2013. To appear in the NPA6 Proceedings in Journal of Physics: Conference Series (JPCS)
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- 2013
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10. The electric dipole response of $^{76}$Se above 4 MeV
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Goddard, P. M., Cooper, N., Werner, V., Rusev, G., Stevenson, P. D., Rios, A., Bernards, C., Chakraborty, A., Crider, B. P., Kelley, J. H., Kwan, E., Glorius, J., Peters, E. E., Pietralla, N., Raut, R., Romig, C., Savran, D., Schnorrenberger, L., Smith, M. K., Sonnabend, K., Tonchev, A. P., Tornow, W., and Yates, S. W.
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Nuclear Experiment ,Nuclear Theory - Abstract
The dipole response of $^{76}_{34}$Se in the energy range 4 to 9 MeV has been analyzed using a $(\vec\gamma,{\gamma}')$ polarized photon scattering technique, performed at the High Intensity $\gamma$-Ray Source facility, to complement previous work performed using unpolarized photons. The results of this work offer both an enhanced sensitivity scan of the dipole response and an unambiguous determination of the parities of the observed J=1 states. The dipole response is found to be dominated by $E1$ excitations, and can reasonably be attributed to a pygmy dipole resonance. Evidence is presented to suggest that a significant amount of directly unobserved excitation strength is present in the region, due to unobserved branching transitions in the decays of resonantly excited states. The dipole response of the region is underestimated when considering only ground state decay branches. We investigate the electric dipole response theoretically, performing calculations in a 3D cartesian-basis time-dependent Skyrme-Hartree-Fock framework., Comment: 20 pages, 18 figures, to be submitted to PRC
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- 2013
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11. Measurement of the reaction O-17(\alpha,n)Ne-20 and its impact on the s process in massive stars
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Best, A., Beard, M., Görres, J., Couder, M., deBoer, R., Falahat, S., Güray, R. T., Kontos, A., Kratz, K. -L., LeBlanc, P. J., Li, Q., O'Brien, S., Özkan, N., Pignatari, M., Sonnabend, K., Talwar, R., Tan, W., Uberseder, E., and Wiescher, M.
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Nuclear Experiment - Abstract
The ratio between the rates of the reactions O-17(\alpha,n)Ne-20 and O-17(\alpha,\gamma)Ne-21 determines whether O-16 is an efficient neutron poison for the s process in massive stars, or if most of the neutrons captured by O-16(n,\gamma) are recycled into the stellar environment. This ratio is of particular relevance to constrain the s process yields of fast rotating massive stars at low metallicity. Recent results on the (\alpha,\gamma) channel have made it necessary to measure the (\alpha,n) reaction more precisely and investigate the effect of the new data on s process nucleosynthesis in massive stars. We present a new measurement of the O-17(\alpha, n) reaction using a moderating neutron detector. In addition, the (\alpha, n_1) channel has been measured independently by observation of the characteristic 1633 keV \gamma-transition in Ne-20. The reaction cross section was determined with a simultaneous R-matrix fit to both channels. (\alpha,n) and (\alpha, \gamma) resonance strengths of states lying below the covered energy range were estimated using their known properties from the literature. A new O-17(\alpha,n) reaction rate was deduced for the temperature range 0.1 GK to 10 GK. It was found that in He burning conditions the (\alpha,\gamma) channel is strong enough to compete with the neutron channel. This leads to a less efficient neutron recycling compared to a previous suggestion of a very weak (\alpha,\gamma) channel. S process calculations using our rates confirm that massive rotating stars do play a significant role in the production of elements up to Sr, but they strongly reduce the s process contribution to heavier elements., Comment: 13 pages, 14 figures, 3 tables
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- 2013
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12. Fragmentation and systematics of the Pygmy Dipole Resonance in the stable N=82 isotones
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Savran, D., Elvers, M., Endres, J., Fritzsche, M., Löher, B., Pietralla, N., Ponomarev, V. Yu., Romig, C., Schnorrenberger, L., Sonnabend, K., and Zilges, A.
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Nuclear Experiment ,Nuclear Theory - Abstract
The low-lying electric dipole (E1) strength in the semi-magic nucleus 136Xe has been measured which finalizes the systematic survey to investigate the so-called pygmy dipole resonance (PDR) in all stable even N=82 isotones with the method of nuclear resonance fluorescence using real photons in the entrance channel. In all cases, a fragmented resonance-like structure of E1 strength is observed in the energy region 5 MeV to 8 MeV. An analysis of the fragmentation of the strength reveals that the degree of fragmentation decreases towards the proton-deficient isotones while the total integrated strength increases indicating a dependence of the total strength on the neutron-to-proton ratio. The experimental results are compared to microscopic calculations within the quasi-particle phonon model (QPM). The calculation includes complex configurations of up to three phonons and is able to reproduce also the fragmentation of the E1 strength which allows to draw conclusions on the damping of the PDR. Calculations and experimental data are in good agreement in the degree of fragmentation and also in the integrated strength if the sensitivity limit of the experiments is taken into account.
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- 2012
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13. Neutron-skin thickness from the study of the anti-analog giant dipole resonance
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Krasznahorkay, A., Stuhl, L., Csatlós, M., Algora, A., Gulyás, J., Timár, J., Paar, N., Vretenar, D., Boretzky, K., Heil, M., Litvinov, Yu. A., Rossi, D., Scheidenberger, C., Simon, H., Weick, H., Bracco, A., Brambilla, S., Blasi, N., Camera, F., Giaz, A., Million, B., Pellegri, L., Riboldi, S., Wieland, O., Altstadt, S., Fonseca, M., Glorius, J., Göbel, K., Heftrich, T., Koloczek, A., Kräckmann, S., Langer, C., Plag, R., Pohl, M., Rastrepina, G., Reifarth, R., Schmidt, S., Sonnabend, K., Weigand, M., Harakeh, M. N., Kalantar-Nayestanaki, N., Rigollet, C., Bagchi, S., Najafi, M. A., Aumann, T., Atar, L., Heine, M., Holl, M., Movsesyan, A., Schrock, P., Volkov, V., Wamers, F., Fiori, E., Löher, B., Marganiec, J., Savran, D., Johansson, H. T., Fernández, P. Diaz, Garg, U., and Balabanski, D. L.
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Nuclear Experiment - Abstract
The gamma-decay of the anti-analog of the giant dipole resonance (AGDR) has been measured to the isobaric analog state excited in the p(124Sn,n) reaction at a beam energy of 600 MeV/nucleon. The energy of the transition was also calculated with state-of-the-art self-consistent random-phase approximation (RPA) and turned out to be very sensitive to the neutron-skin thickness (\DeltaR_(pn)). By comparing the theoretical results with the measured one, the \DeltaR_(pn) value for 124Sn was deduced to be 0.175 \pm 0.048 fm, which agrees well with the previous results. The energy of the AGDR measured previously for ^(208)Pb was also used to determine the \DeltaR_(pn) for ^(208)Pb. In this way a very precise \DeltaR_(pn) = 0.181 \pm 0.031 neutron-skin thickness has been obtained for 208Pb. The present method offers new possibilities for measuring the neutron-skin thicknesses of very exotic isotopes., Comment: 5 pages, 3 figures
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- 2012
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14. First direct measurement of resonance strengths in 17O({\alpha}, {\gamma})21Ne
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Best, A., Görres, J., Couder, M., deBoer, R., Falahat, S., Kontos, A., LeBlanc, P. J., Li, Q., O'Brien, S., Sonnabend, K., Talwar, R., Uberseder, E., and Wiescher, M.
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Nuclear Experiment - Abstract
The reaction 17O({\alpha},{\gamma})21Ne has been measured by in-beam gamma spectroscopy for the first time in the energy range E{\alpha} = 750 keV to 1650 keV using highly enriched anodized Ta2(17O)5 targets. Resonances were found at E({\alpha}) = 1002 keV, 1386 keV and 1619 keV. Their strengths and primary gamma-ray branchings are given. The new results exclude the low reaction rate of Descouvemont and support the rate of Caughlan and Fowler. Implications for the neutron poisoning efficiency of 16O in the weak s process are discussed., Comment: 5 pages, 5 figures, 2 tables, Accepted for publication in Phys. Rev. C
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- 2011
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15. High precision $^{89}$Y($\alpha$,$\alpha$)$^{89}$Y scattering at low energies
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Kiss, G. G., Mohr, P., Fülöp, Zs., Galaviz, D., Gyürky, Gy., Elekes, Z., Somorjai, E., Kretschmer, A., Sonnabend, K., Zilges, A., and Avrigeanu, M.
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Nuclear Experiment - Abstract
Elastic scattering cross sections of the $^{89}$Y($\alpha$,$\alpha$)$^{89}$Y reaction have been measured at energies E$_{c.m.}$ = 15.51 and 18.63 MeV. The high precision data for the semi-magic $N = 50$ nucleus $^{89}$Y are used to derive a local potential and to evaluate the predictions of global and regional $\alpha$-nucleus potentials. The variation of the elastic alpha scattering cross sections along the $N = 50$ isotonic chain is investigated by a study of the ratios of angular distributions for $^{89}$Y($\alpha$,$\alpha$)$^{89}$Y and $^{92}$Mo($\alpha$,$\alpha$)$^{92}$Mo at E$_{c.m.} \approx$ 15.51 and 18.63 MeV. This ratio is a very sensitive probe at energies close to the Coulomb barrier, where scattering data alone is usually not enough to characterize the different potentials. Furthermore, $\alpha$-cluster states in $^{93}$Nb = $^{89}$Y $\otimes$ $\alpha$ are investigated.
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- 2010
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16. Isospin Character of the Pygmy Dipole Resonance in 124Sn
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Endres, J., Litvinova, E., Savran, D., Butler, P. A., Harakeh, M. N., Harissopulos, S., Herzberg, R. -D., Krücken, R., Lagoyannis, A., Pietralla, N., Ponomarev, V. Yu., Popescu, L., Ring, P., Scheck, M., Sonnabend, K., Stoica, V. I., Wörtche, H. J., and Zilges, A.
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Nuclear Experiment ,Nuclear Theory - Abstract
The pygmy dipole resonance has been studied in the proton-magic nucleus 124Sn with the (a,a'g) coincidence method at E=136 MeV. The comparison with results of photon-scattering experiments reveals a splitting into two components with different structure: one group of states which is excited in (a,a'g) as well as in (g,g') reactions and a group of states at higher energies which is only excited in (g,g') reactions. Calculations with the self-consistent relativistic quasiparticle time-blocking approximation and the quasiparticle phonon model are in qualitative agreement with the experimental results and predict a low-lying isoscalar component dominated by neutron-skin oscillations and a higher-lying more isovector component on the tail of the giant dipole resonance.
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- 2010
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17. Investigation of photoneutron reactions close to and above the neutron emission threshold in the rare earth region
- Author
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Hasper, J., Müller, S., Savran, D., Schnorrenberger, L., Sonnabend, K., and Zilges, A.
- Subjects
Astrophysics - Abstract
We have investigated the photoneutron cross section of the isotopes $^{148,150}$Nd, $^{154}$Sm, and $^{154,160}$Gd close to the neutron emission threshold in photoactivation experiments at the Darmstadt superconducting electron linear accelerator S-DALINAC. Naturally composed targets were activated with a high-intensity bremsstrahlung beam at various energies and the reaction yields have been determined by measuring the activity of the produced radioactive isotopes with HPGe detectors. The results are compared to two different statistical model calculations., Comment: Accepted for publication in Physical Review C
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- 2007
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18. $^{187}$Re(\gamm,n) cross section close to and above the neutron threshold
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Müller, S., Kretschmer, A., Sonnabend, K., Zilges, A., and Galaviz, D.
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Astrophysics - Abstract
The neutron capture cross section of the unstable nucleus $^{186}$Re is studied by investigating the inverse photodisintegration reaction $^{187}$Re($\gamma$,n). The special interest of the {\it s}-process branching point $^{186}$Re is related to the question of possible {\it s}-process contributions to the abundance of the {\it r}-process chronometer nucleus ^{187}$Re. We use the photoactivation technique to measure photodisintegration rates. Our experimental results are in good agreement with two different statistical model calculations. Although the cross sections predicted by both models for the inverse reaction $^{186}$Re(n,$\gamma$) is too low to remove the overproduction of $^{186}$Os; the two predicted neutron-capture cross sections differ by a factor of 2.4; this calls for future theoretical study., Comment: Phys. Rev. C, in press
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- 2005
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19. Systematic study of (g,n) reaction rates for Z>=78 isotopes
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Sonnabend, K., Vogt, K., Galaviz, D., Mueller, S., and Zilges, A.
- Subjects
Astrophysics - Abstract
The (g,n) reaction rates of the isotopes 196,198,204-Hg and 204-Pb have been determined using the photoactivation technique in an energy region relevant for p process nucleosynthesis. The systematic study of the ground-state (g,n) reaction rates on even-even nuclei in the mass region Z>=78 is complemented with these experiments. The data are compared to rates predicted in the framework of two statistical model approaches., Comment: Phys. Rev. C, in press; Erratum (Phys. Rev. C, submitted) added
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- 2004
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20. The (n,g) cross sections of short-living s-process branching points
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Sonnabend, K., Mengoni, A., Mohr, P., Rauscher, T., Vogt, K., and Zilges, A.
- Subjects
Astrophysics - Abstract
An experimental method to determine the (n,g) cross section of short-living s-process branching points using data of the inverse (g,n) reaction is presented. The method was used to observe the branching point nucleus 95Zr because the elemental abundance patterns corresponding to this branching point cannot be reproduced by full stellar models and a possible error source is the neutron capture cross section of 95Zr. The analysis of the experiment is still under progress, we will outline the current status in this manuscript., Comment: 10 pages, 6 figures
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- 2004
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21. The s-process branching at 185W
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Sonnabend, K., Mohr, P., Vogt, K., Zilges, A., Mengoni, A., Rauscher, T., Beer, H., Kaeppeler, F., and Gallino, R.
- Subjects
Astrophysics - Abstract
The neutron capture cross section of the unstable nucleus 185W has been derived from experimental photoactivation data of the inverse reaction 186W(gamma,n)185W. The new result of sigma = (687 +- 110) mbarn confirms the theoretically predicted neutron capture cross section of 185W of sigma = 700 mbarn at kT = 30 keV. A neutron density in the classical s-process of n_n = (3.8 +0.9 -0.8} * 1e8 cm-3 is derived from the new data for the 185W branching. In a stellar s-process model one finds a significant overproduction of the residual s-only nucleus 186Os., Comment: ApJ, in press
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- 2002
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22. Qualitative und quantitative Analyse des funktionellen Kardio-MRT unter Kombination von Compressed SENSE und Deep-learning basierter Bildrekonstruktion.
- Author
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Klein, K, additional, Langenbach, M, additional, Terzis, R, additional, Langenbach, I, additional, Pennig, L, additional, Maintz, D, additional, Matej, G, additional, Sonnabend, K, additional, and Nähle, P, additional
- Published
- 2023
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23. Ein auf Deep Learning basierender Rekonstruktionsansatz für beschleunigte MRT-Bilder der Schulter mit Compressed Sensing: Bewertung bei gesunden Probanden
- Author
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Dratsch, T, additional, Sonnabend, K, additional, Rauen, P, additional, Zäske, C, additional, Siedek, F, additional, Maintz, D, additional, Bratke, G, additional, and Iuga, A, additional
- Published
- 2023
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24. Detection and size measurements of kidney stones on virtual non-contrast reconstructions derived from dual-layer computed tomography in an ex vivo phantom setup
- Author
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Reimer, R. P., primary, Zaytoun, H., additional, Klein, K., additional, Sonnabend, K., additional, Lennartz, S., additional, Zopfs, D., additional, Heidenreich, A., additional, Maintz, D., additional, and Große Hokamp, N., additional
- Published
- 2022
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25. Behavior of a trapezoid-based data acquisition system up to 100 kHz and beyond
- Author
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Schmidt, S., Heftrich, T., Glorius, J., Hampel, G., Plag, R., Reifarth, R., Slavkovská, Z., Sonnabend, K., Stieghorst, C., Wiehl, N., and Zauner, S.
- Published
- 2014
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26. Detektion und Größenmessungen von Nierensteinen in virtuell-nativen Rekonstruktionen (VNR) aus der Spektral-Detektor-Computertomographie (SDCT)
- Author
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Reimer, P R, additional, Zaytoun, H, additional, Klein, K, additional, Sonnabend, K, additional, Lennartz, S, additional, Zopfs, D, additional, Fischer, N, additional, Maintz, D, additional, and Große-Hokamp, N, additional
- Published
- 2022
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27. Intraindividuelle longitudinale Konstanz virtuell nativer Rekonstruktionen der Spektral Detektor-CT
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Zopfs, D, additional, Sonnabend, K, additional, Lotter-Becker, L, additional, Reimer, P R, additional, Hentschke, C, additional, Lennartz, S, additional, and Große-Hokamp, N, additional
- Published
- 2022
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28. Compressed sense (CS) ermöglicht Scanzeitreduktion von Sequenzen zur Metallartefaktreduktion (MARS) sowie weitere Artefaktabnahme gegenüber MARS ohne CS
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Siedek, F, additional, Große-Hokamp, N, additional, Weiss, K, additional, Maintz, D, additional, Sonnabend, K, additional, Persigehl, T, additional, and Haneder, S, additional
- Published
- 2022
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29. 13,14B(n, γ) via Coulomb Dissociation for Nucleosynthesis towards the r-Process
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Altstadt, S.G., Adachi, T., Aksyutina, Y., Alcantara, J., Alvarez-Pol, H., Ashwood, N., Atar, L., Aumann, T., Avdeichikov, V., Barr, M., Beceiro, S., Bemmerer, D., Benlliure, J., Bertulani, C.A., Boretzky, K., Borge, M.J.G., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chakraborty, S., Chartier, M., Chulkov, L., Cortina-Gil, D., Datta Pramanik, U., Diaz Fernandez, P., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L.M., Freer, M., Freudenberger, M., Fynbo, H.O.U., Galaviz, D., Geissel, H., Gernhäuser, R., Göbel, K., Golubev, P., Gonzalez Diaz, D., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Holt, J.D., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H.T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knöbel, R., Kröll, T., Krücken, R., Kurcewicz, J., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lepyoshkina, O., Machado, J., Marganiec, J., Maroussov, V., Menéndez, J., Mostazo, M., Movsesyan, A., Najafi, M.A., Nilsson, T., Nociforo, C., Panin, V., Perea, A., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M.V., Rigollet, C., Riisager, K., Röder, M., Rossi, D., Sanchez del Rio, J., Savran, D., Scheit, H., Schwenk, A., Simon, H., Simonis, J., Sonnabend, K., Sorlin, O., Stoica, V., Streicher, B., Taylor, J., Tengblad, O., Terashima, S., Thies, R., Togano, Y., Uberseder, E., Van de Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J.S., Woods, P., Yakorev, D., Zhukov, M.V., Zilges, A., Zoric, M., and Zuber, K.
- Published
- 2014
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30. Study of the 106Cd(α, α)106Cd scattering at energies relevant to the p-process
- Author
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Kiss, G. G., Fülöp, Zs., Gyürky, Gy., Máté, Z., Somorjai, E., Galaviz, D., Kretschmer, A., Sonnabend, K., Zilges, A., Fülöp, Zsolt, editor, Gyürky, György, editor, and Somorjai, Endre, editor
- Published
- 2006
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31. Photodissociation of neutron deficient nuclei
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Sonnabend, K., Babilon, M., Hasper, J., Müller, S., Zarza, M., Zilges, A., Fülöp, Zsolt, editor, Gyürky, György, editor, and Somorjai, Endre, editor
- Published
- 2006
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32. Physics book: CRYRING@ESR
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Lestinsky, M., Andrianov, V., Aurand, B., Bagnoud, V., Bernhardt, D., Beyer, H., Bishop, S., Blaum, K., Bleile, A., Borovik, Jr., At., Bosch, F., Bostock, C.J., Brandau, C., Bräuning-Demian, A., Bray, I., Davinson, T., Ebinger, B., Echler, A., Egelhof, P., Ehresmann, A., Engström, M., Enss, C., Ferreira, N., Fischer, D., Fleischmann, A., Förster, E., Fritzsche, S., Geithner, R., Geyer, S., Glorius, J., Göbel, K., Gorda, O., Goullon, J., Grabitz, P., Grisenti, R., Gumberidze, A., Hagmann, S., Heil, M., Heinz, A., Herfurth, F., Heß, R., Hillenbrand, P.-M., Hubele, R., Indelicato, P., Källberg, A., Kester, O., Kiselev, O., Knie, A., Kozhuharov, C., Kraft-Bermuth, S., Kühl, T., Lane, G., Litvinov, Yu.A., Liesen, D., Ma, X.W., Märtin, R., Moshammer, R., Müller, A., Namba, S., Neumeyer, P., Nilsson, T., Nörtershäuser, W., Paulus, G., Petridis, N., Reed, M., Reifarth, R., Reiß, P., Rothhardt, J., Sanchez, R., Sanjari, M.S., Schippers, S., Schmidt, H.T., Schneider, D., Scholz, P., Schuch, R., Schulz, M., Shabaev, V., Simonsson, A., Sjöholm, J., Skeppstedt, Ö, Sonnabend, K., Spillmann, U., Stiebing, K., Steck, M., Stöhlker, T., Surzhykov, A., Torilov, S., Träbert, E., Trassinelli, M., Trotsenko, S., Tu, X.L., Uschmann, I., Walker, P.M., Weber, G., Winters, D.F.A., Woods, P.J., Zhao, H.Y., and Zhang, Y.H.
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- 2016
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33. The Darmstadt High-Intensity Photon Setup (DHIPS) at the S-DALINAC
- Author
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Sonnabend, K., Savran, D., Beller, J., Büssing, M.A., Constantinescu, A., Elvers, M., Endres, J., Fritzsche, M., Glorius, J., Hasper, J., Isaak, J., Löher, B., Müller, S., Pietralla, N., Romig, C., Sauerwein, A., Schnorrenberger, L., Wälzlein, C., Zilges, A., and Zweidinger, M.
- Published
- 2011
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34. Structure of high-lying levels populated in the Y-96 -> Zr-96 beta decay
- Author
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Mashtakov, KR, Ponomarevc, V Yu, Scheck, M, Finch, SW, Isaak, J, Zweidinger, M, Agar, O, Bathia, C, Beck, T, Beller, J, Bowrya, M, Chapman, R, Chishti, MMR, Friman-Gayer, U, Gaffney, LP, Garrett, PE, Gregor, ET, Keatings, JM, Koster, U, Loher, B, MacLean, AD, O'Donnell, D, Pai, H, Pietralla, N, Rainovski, G, Ramdhane, M, Romig, C, Rusev, G, Savran, D, Simpson, GS, Sinclair, J, Sonnabend, K, Spagnoletti, P, Tonchev, AP, and Tornow, W
- Subjects
Science & Technology ,Physics, Nuclear ,Reactor antineutrino anomaly ,NUCLEAR-DATA SHEETS ,Quasi-particle phonon model ,Physics ,Physical Sciences ,High resolution gamma-ray spectroscopy ,Pygmy dipole resonance ,Astronomy & Astrophysics ,Physics, Particles & Fields - Abstract
ispartof: PHYSICS LETTERS B vol:820 status: published
- Published
- 2021
35. Structure of high-lying levels populated in the Y → Zr Decay
- Author
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Mashtakov, K.R., Ponomarev, V.Yu., Scheck, M., Finch, S.W., Isaak, J., Zweidinger, M., Agar, O., Bathia, C., Beck, T., Beller, J., Bowry, M., Chapman, R., Chishti, M.M.R., Friman-Gayer, U., Gaffney, L.P., Garrett, P.E., Gregor, E.T., Keatings, J.M., Köster, U., Löher, B., MacLean, A.D., O'Donnell, D., Pai, H., Pietralla, N., Rainovski, G., Ramdhane, M., Romig, C., Rusev, G., Savran, D., Simpson, G.S., Sinclair, J., Sonnabend, K., Spagnoletti, P., Tonchev, A.P., and Tornow, W.
- Abstract
The nature of the high-lying final levels of the $^{96}$Y$_{gs}$ β decay, one of the three most important contributors to the high-energy reactor antineutrino spectrum, has been investigated in high-resolution γ-ray spectroscopy following the β decay as well as in a campaign of inelastic photon scattering experiments. The comprehensive approach establishes 1$^{−}$ levels associated with the Pygmy Dipole Resonance as high-lying final levels in the β decay. Branching ratios extracted from β decay complement photon scattering and allow the absolute E1 excitation strength to be determined for levels populated in both reactions. The combined data represents a comprehensive approach to the wavefunction of the 1− levels below the Qβ value, which are investigated in the Quasiparticle Phonon Model. The calculations reveal that the components populated in β decay contribute only with small amplitudes to the complex wavefunction of these 1$^{−}$ levels. A comparison of the β decay results to data from total absorption γ-ray spectroscopy demonstrates a good agreement between both measurements.
- Published
- 2021
36. Structure of high-lying levels populated in the 96Y →96Zr β decay
- Author
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Mashtakov, K.R., Ponomarev, V.Yu., Scheck, M., Finch, S.W., Isaak, J., Zweidinger, M., Agar, O., Bathia, C., Beck, T., Beller, J., Bowry, M., Chapman, R., Chishti, M.M.R., Friman-Gayer, U., Gaffney, L.P., Garrett, P.E., Gregor, E.T., Keatings, J.M., Köster, U., Löher, B., MacLean, A.D., O'Donnell, D., Pai, H., Pietralla, N., Rainovski, G., Ramdhane, M., Romig, C., Rusev, G., Savran, D., Simpson, G.S., Sinclair, J., Sonnabend, K., Spagnoletti, P., Tonchev, A.P., and Tornow, W.
- Published
- 2021
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37. The low-energy photon tagger NEPTUN
- Author
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Savran, D., Lindenberg, K., Glorius, J., Löher, B., Müller, S., Pietralla, N., Schnorrenberger, L., Simon, V., Sonnabend, K., Wälzlein, C., Elvers, M., Endres, J., Hasper, J., and Zilges, A.
- Published
- 2010
- Full Text
- View/download PDF
38. Structure of high-lying levels populated in the $^{96}Y$ ��� $^{96}Zr$ $��$ decay
- Author
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Mashtakov, K. R., Ponomarev, V. Yu., Scheck, M., Finch, S. W., Isaak, J., Zweidinger, M., Agar, O., Bathia, C., Beck, T., Beller, J., Bowry, M., Chapman, R., Chishti, M. M. R., Friman-Gayer, U., Gaffney, L. P., Garrett, P. E., Gregor, E. T., Keatings, J. M., K��ster, U., L��her, Bastian, MacLean, A. D., O'Donnell, D., Pai, H., Pietralla, N., Rainovski, G., Ramdhane, M., Romig, C., Rusev, G., Savran, D., Simpson, G. S., Sinclair, J., Sonnabend, K., Spagnoletti, P., Tonchev, A. P., and Tornow, W.
- Abstract
Physics letters / B 820, 136569 (2021). doi:10.1016/j.physletb.2021.136569, Published by North-Holland Publ., Amsterdam
- Published
- 2021
- Full Text
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39. Neutron activation of $^{69}$Ga and $^{71}$Ga at kBT≈25 keV
- Author
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Göbel, K., Beinrucker, C., Brückner, B., Erbacher, P., Fiebiger, S., Fonseca, M., Heftrich, M., Heftrich, T., Käppeler, F., Krása, A., Kurtulgil, D., Lederer-Woods, C., Plag, R., Plompen, A., Reifarth, R., Schmidt, S., Sonnabend, K., and Weigand, M.
- Subjects
Physics ,ddc:530 - Abstract
Background: About 50% of heavy elements are produced by the slow neutron capture process (s process) in stars. The element gallium is mostly produced during the weak s process in massive stars. Purpose: Our activation at k$_{B}$T≈25 keV is the first experiment in a series of activation and time-of-flight measurements on $^{69}$Ga and $^{71}$Ga relevant for astrophysics. Methods: We activated $^{69}$Ga and $^{71}$Ga with a neutron distribution that corresponds to a quasistellar distribution with k$_{B}$T=25 keV at the Joint Research Centre (JRC), Geel, Belgium. Protons were provided by an electrostatic Van de Graaff accelerator to produce neutrons via the reaction $^{7}$Li(p,n). The produced activity was measured via the γ emission by the decaying product nuclei by high-purity germanium detectors. Results: We provide spectrum-averaged cross sections (SACS) and ratios of the cross sections σ$_{Ga}$/σ$_{Au}$ for the neutron spectrum of the activation. We obtain values of σ$_{69Ga,SACS}$=(186±12) mb and σ$_{71GA,SACS}$ = (112±7) mb, and cross section ratios of σ$_{69Ga}$/σ$_{Au}$=0.29±0.02 and σ$_{71Ga}$/σ$_{Au}$ = 0.17±0.01. Conclusions: Our data disagree with the available evaluated data provided by KADoNiS v0.3, our cross-section ratio is about 20% higher for $^{69}$Ga and about 20% lower for $^{71}$Ga.
- Published
- 2021
40. Storage ring at HIE-ISOLDE: Technical design report
- Author
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Grieser, M., Litvinov, Yu. A., Raabe, R., Blaum, K., Blumenfeld, Y., Butler, P. A., Wenander, F., Woods, P. J., Aliotta, M., Andreyev, A., Artemyev, A., Atanasov, D., Aumann, T., Balabanski, D., Barzakh, A., Batist, L., Bernardes, A. -P., Bernhardt, D., Billowes, J., Bishop, S., Borge, M., Borzov, I., Bosch, F., Boston, A. J., Brandau, C., Catford, W., Catherall, R., Cederkäll, J., Cullen, D., Davinson, T., Dillmann, I., Dimopoulou, C., Dracoulis, G., Düllmann, Ch. E., Egelhof, P., Estrade, A., Fischer, D., Flanagan, K., Fraile, L., Fraser, M. A., Freeman, S. J., Geissel, H., Gerl, J., Greenlees, P., Grisenti, R. E., Habs, D., von Hahn, R., Hagmann, S., Hausmann, M., He, J. J., Heil, M., Huyse, M., Jenkins, D., Jokinen, A., Jonson, B., Joss, D. T., Kadi, Y., Kalantar-Nayestanaki, N., Kay, B. P., Kiselev, O., Kluge, H. -J., Kowalska, M., Kozhuharov, C., Kreim, S., Kröll, T., Kurcewicz, J., Labiche, M., Lemmon, R. C., Lestinsky, M., Lotay, G., Ma, X. W., Marta, M., Meng, J., Mücher, D., Mukha, I., Müller, A., Murphy, A. St J., Neyens, G., Nilsson, T., Nociforo, C., Nörtershäuser, W., Page, R. D., Pasini, M., Petridis, N., Pietralla, N., Pfützner, M., Podolyák, Z., Regan, P., Reed, M. W., Reifarth, R., Reiter, P., Repnow, R., Riisager, K., Rubio, B., Sanjari, M. S., Savin, D. W., Scheidenberger, C., Schippers, S., Schneider, D., Schuch, R., Schwalm, D., Schweikhard, L., Shubina, D., Siesling, E., Simon, H., Simpson, J., Smith, J., Sonnabend, K., Steck, M., Stora, T., Stöhlker, T., Sun, B., Surzhykov, A., Suzaki, F., Tarasov, O., Trotsenko, S., Tu, X. L., Van Duppen, P., Volpe, C., Voulot, D., Walker, P. M., Wildner, E., Winckler, N., Winters, D. F. A., Wolf, A., Xu, H. S., Yakushev, A., Yamaguchi, T., Yuan, Y. J., Zhang, Y. H., and Zuber, K.
- Published
- 2012
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41. The photoresponse of 45Sc up to 7 MeV
- Author
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Savran, D., Bayer, W., Galaviz, D., Müller, S., Sonnabend, K., and Zilges, A.
- Published
- 2008
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42. The dipole response of 87Rb and its impact on the 86Rb(n,γ)87Rb cross section
- Author
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Wilhelmy, J., Müscher, M., Rusev, G., Schwengner, R., Beyer, R., Bhike, M., Erbacher, P., Fiedler, F., Friman-Gayer, U., Glorius, J., Greifenhagen, R., Hammer, S., Hensel, T., Isaak, J., Junghans, A. R., Krishichayan, F., Löher, B., Müller, S. E., Pietralla, N., Reinicke, S., Savran, D., Scholz, P., Sonnabend, K., Szücs, T., Tamkas, M., Tornow, W., Turkat, S., Wagner, A., and Zilges, A.
- Abstract
Background: Detailed information on the low-lying dipole response in atomic nuclei along isotonic or isotopic chains is well suited to systematically investigate the structure and evolution of the Pygmy Dipole Resonance (PDR). Moreover, the dipole strength below and around the neutron separation energy Sn has impact on statistical model calculations for nucleosynthesis processes. Purpose: The photon strength function (PSF) of 87 Rb, which is directly connected to the photoabsorption cross section, is a crucial input for statistical model calculations constraining the Maxwellian-averaged cross section (MACS) of the neutron capture of the unstable s-process branching-point nucleus 86 Rb. Within this work, the photoabsorption cross section is investigated. Methods: The photoabsorption cross section of the N = 50 nucleus 87 Rb was determined from photon-scattering experiments via the Nuclear Resonance Fluorescence (NRF) technique. Bremsstrahlung beams at the γELBE facility in conjunction with monoenergetic photon beams at the HIGS facility were used to determine the integrated cross sections Is of isolated states as well as the averaged cross section as function of the excitation energy. Decays to the ground state were disentangled from decays to first low-lying excited states. Statistical and experimental approaches for the γ-decay properties at various excitation energies were applied. The linearly polarized photon beams at HIGS provide information on the ratio of electric and magnetic type of radiation. Results: Within this work, more than 200 ground-state decays and associated levels in 87Rb were identified. Moreover, transitions below the sensitivity limit of the state-by-state analysis were taken into account via a statistical approach from the bremsstrahlung data as well as model-independently from the HIGS data. The photoabsorption cross sections at various excitation energies were determined. The dipole response between 6 and 10 MeV of 87 Rb is in agreement with assuming contributions of electric multipolarity, only. Conclusions: The photoabsorption cross section of 87Rb does not contradict with the trend of decreasing E1 strength with increasing proton number along the N = 50 isotonic chain but might also be associated with a constant trend. The experimental γ decay at various excitation energies of the HIGS data supports the statistical approach but does not provide a stringent proof due to the limited sensitivity in the decay channels. The additional E1 strength observed in the present experiments significantly enhances the MACSs compared to recent microscopic D1M HFB+QRPA calculations only. Moreover, theoretical estimations provided by the KADoN iS project could be significantly improved.
- Published
- 2020
43. Structure of high-lying levels populated in the $^{96}$Y $\rightarrow ^{96}$Zr $\beta$ decay
- Author
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Mashtakov, K.R., Ponomarev, V.Yu., Scheck, M., Finch, S.W., Isaak, J., Zweidinger, M., Agar, O., Bathia, C., Beck, T., Beller, J., Bowry, M., Chapman, R., Chishti, M.M.R., Friman-Gayer, U., Gaffney, L.P., Garrett, P.E., Gregor, E.T., Keatings, J.M., Köster, U., Löher, B., MacLean, A.D., O'Donnell, D., Pai, H., Pietralla, N., Rainovski, G., Ramdhane, M., Romig, C., Rusev, G., Savran, D., Simpson, G.S., Sinclair, J., Sonnabend, K., Spagnoletti, P., Tonchev, A.P., Tornow, W., HEP, INSPIRE, Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)
- Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,High Energy Physics::Experiment ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Experiment - Abstract
The nature of $J^{\pi}=1^-$ levels of $^{96}$Zr below the $\beta$-decay $Q_{\beta}$ value of $^{96}$Y has been investigated in high-resolution $\gamma$-ray spectroscopy following the $\beta$ decay as well as in a campaign of inelastic photon scattering experiments. Branching ratios extracted from $\beta$ decay allow the absolute $E1$ excitation strength to be determined for levels populated in both reactions. The combined data represents a comprehensive approach to the wavefunction of $1^-$ levels below the $Q_{\beta}$ value, which are investigated in the theoretical approach of the Quasiparticle Phonon Model. This study clarifies the nuclear structure properties associated with the enhanced population of high-lying levels in the $^{96}$Y$_{gs}$ $\beta$ decay, one of the three most important contributors to the high-energy reactor antineutrino spectrum.
- Published
- 2020
44. Structure of high-lying levels populated in the ⁹⁶Y → ⁹⁶Zr β decay
- Author
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Mashtakov, K. R., Ponomarev, V. Yu., Scheck, M., Finch, S. W., Isaak, J., Zweidinger, M., Agar, O., Bathia, C., Beck, T., Beller, J., Bowry, M., Chapman, R., Chishti, M. M. R., Friman-Gayer, U., Gaffney, L. P., Garrett, P. E., Gregor, E. T., Keatings, J. M., Köster, U., Löher, B., McLean, A. D., O'Donnell, D., Pai, H., Pietralla, N., Rainovski, G., Ramdhane, M., Romig, C., Rusev, G., Savran, D., Simpson, G. S., Sinclair, J., Sonnabend, K., Spagnoletti, P., Tonchev, A. P., and Tornow, W.
- Abstract
The nature of Jπ=1− levels of 96Zr below the β-decay Qβ value of 96Y has been investigated in high-resolution γ-ray spectroscopy following the β decay as well as in a campaign of inelastic photon scattering experiments. Branching ratios extracted from β decay allow the absolute E1 excitation strength to be determined for levels populated in both reactions. The combined data represents a comprehensive approach to the wavefunction of 1− levels below the Qβ value, which are investigated in the theoretical approach of the Quasiparticle Phonon Model. This study clarifies the nuclear structure properties associated with the enhanced population of high-lying levels in the 96Ygs β decay, one of the three most important contributors to the high-energy reactor antineutrino spectrum.
- Published
- 2020
45. Beschleunigung der Kardio-MRT mit Compressed Sense und Deep-learning basierter Bildrekonstruktion: Eine qualitative Analyse.
- Author
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Klein, K, Langenbach, M, Terzis, R, Langenbach, I, Pennig, L, Maintz, D, Gajzler, M, Sonnabend, K, and Naehle, C
- Published
- 2024
- Full Text
- View/download PDF
46. Schnellere 3D-MR-Bildgebung des Knies. Ein auf Deep Learning basierender Rekonstruktionsansatz für beschleunigte Bildgebung mit Compressed Sensing: Bewertung bei gesunden Probanden.
- Author
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Dratsch, T, Zaeske, C, Siedek, F, Rauen, P, Große Hokamp, N, Sonnabend, K, Maintz, D, Bratke, G, and Iuga, A
- Published
- 2024
- Full Text
- View/download PDF
47. MRT des Kniegelenkes unter 5 Minuten mittels KI: ein Superresolution Rekonstruktionsansatz für Compressed Sensing.
- Author
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Terzis, R, Dratsch, T, Hahnfeldt, R, Basten, L, Rauen, P, Sonnabend, K, Weiss, K, Reimer, R, Maintz, D, Iuga, A I, and Bratke, G
- Published
- 2024
- Full Text
- View/download PDF
48. Ist ein 3 Minuten Knie MRT-Protokoll im klinischen Alltag ausreichend? Ein SuperResolution Rekonstruktionsansatz für niedrig aufgelöste Sequenzen mittels KI und Compressed Sensing.
- Author
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Hahnfeldt, R, Terzis, R, Dratsch, T, Basten, L, Rauen, P, Oppermann, J, Grevenstein, D, Sonnabend, K, Maintz, D, Kottlors, J, Brakte, G, Iuga, A I, and Skornitzke, S
- Published
- 2024
- Full Text
- View/download PDF
49. QPM Analysis of 205Tl Nuclear Excitations below the Giant Dipole Resonance
- Author
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Benouaret N., Beller J., Isaak J., Kelley J.H., Pai H., Pietralla N., Ponomarev V.Yu., Raut R., Romig C., Rusev G., Savran D., Scheck M., Schnorrenberger L., Sonnabend K., Tonchev A.P., Tornow W., Weller H.R., and Zweidinger M.
- Subjects
Physics ,QC1-999 - Abstract
We analysed our experimental recent findings of the dipole response of the odd-mass stable nucleus 205Tl within the quasi-particle phonon model. Using the phonon basis constructed for the neighbouring 204Hg and wave function configurations for 205Tl consisting of a mixture of quasiparticle ⊗ N-phonon configurations (N=0,1,2), only one group of fragmented dipole excited states has been reproduced at 5.5 MeV in comparison to the experimental distribution which shows a second group at about 5 MeV. The computed dipole transition strengths are mainly of E1 character which could be associated to the pygmy dipole resonance.
- Published
- 2015
- Full Text
- View/download PDF
50. Direct Determination of Ground-State Transition Widths and Natural Level Widths with the Method of Relative Self Absorption
- Author
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Romig C., Beck T., Beller J., Birkhan J., Endres A., Fritzsche M., Gayer U., Glorius J., Isaak J., Mertes L., Pai H., Pietralla N., Ries P., Savran D., Scheck M., Schnorrenberger L., Sonnabend K., Werner V., and Zweidinger M.
- Subjects
Physics ,QC1-999 - Abstract
The method of relative self absorption is based on the technique of nuclear resonance fluorescence measurements. It allows for a model-independent determination of ground-state transition widths, natural level widths, and, consequently, of branching ratios to the ground state for individual excitations. Relative self–absorption experiments have been performed on the nuclei 6Li and 140Ce. In order to investigate the total level width for the 0+1, T = 1 level at 3563 keV in 6Li, a high-precision self-absorption measurement has been performed. In the case of 140Ce, self absorption has been applied for the first time to study decay widths of dipole-excited states in the energy regime of the pygmy dipole resonance.
- Published
- 2015
- Full Text
- View/download PDF
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