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26 results on '"Özel-Tashenov, B."'

1. Low-energy dipole strength in 112,120Sn

Author

Özel-Tashenov, B., Enders, J., Lenske, H., Krumbholz, A. M., Litvinova, E., von Neumann-Cosel, P., Poltoratska, I., Richter, A., Rusev, G., Savran, D., and Tsoneva, N.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The 112,120Sn(gamma,gamma') reactions below the neutron separation energies have been studied at the superconducting Darmstadt electron linear accelerator S-DALINAC for different endpoint energies of the incident bremsstrahlung spectrum. Dipole strength distributions are extracted for 112Sn up to 9.5 MeV and for 120Sn up to 9.1 MeV. A concentration of dipole excitations is observed between 5 and 8 MeV in both nuclei. Missing strength due to unobserved decays to excited states is estimated in a statistical model. A fluctuation analysis is applied to the photon scattering spectra to extract the amount of the unresolved strength hidden in background due to fragmentation. The strength distributions are discussed within different model approaches such as the quasiparticle-phonon model and the relativistic time blocking approximation allowing for an inclusion of complex configurations beyond the initial particle-hole states. While a satisfactory description of the fragmentation can be achieved for sufficently large model spaces, the predicted centroids and total electric dipole strengths for stable tin isotopes strongly depend on the assumptions about the underlying mean field., Comment: 14 pages, 12 figures, revised version, accepted for publication in Phys. Rev. C

Published
2014
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2. Hypernuclear spectroscopy of products from 6Li projectiles on a carbon target at 2 AGeV

Author

Rappold, C., Kim, E., Nakajima, D., Saito, T. R., Bertini, O., Bianchin, S., Bozkurt, V., Kavatsyuk, M., Ma, Y., Maas, F., Minami, S., Özel-Tashenov, B., Yoshida, K., Achenbach, P., Ajimura, S., Aumann, T., Gayoso, C. Ayerbe, Bhang, H. C., Caesar, C., Erturk, S., Fukuda, T., Göküzüm, B., Guliev, E., Hiraiwa, T., Hoffmann, J., Ickert, G., Ketenci, Z. S., Khaneft, D., Kim, M., Kim, S., Koch, K., Kurz, N., Fèvre, A. Le, Mizoi, Y., Moritsu, M., Nagae, T., Nungesser, L., Okamura, A., Ott, W., Pochodzalla, J., Sakaguchi, A., Sako, M., Schmidt, C. J., Sekimoto, M., Simon, H., Sugimura, H., Takahashi, T., Tambave, G. J., Tamura, H., Trautmann, W., Voltz, S., Yokota, N., and Yoon, C. J.

Subjects
Nuclear Experiment
Abstract

A novel experiment, aiming at demonstrating the feasibility of hypernuclear spectroscopy with heavy-ion beams, was conducted. Using the invariant mass method, the spectroscopy of hypernuclear products of 6Li projectiles on a carbon target at 2 AGeV was performed. Signals of the \Lambda-hyperon and 3\Lambda H and 4\Lambda H hypernuclei were observed for final states of p+\pi^-, 3He+\pi^- and 4He+\pi^-, respectively, with significance values of 6.7, 4.7 and 4.9\sigma. By analyzing the proper decay time from secondary vertex distribution with the unbinned maximum likelihood fitting method, their lifetime values were deduced to be $262 ^{+56}_{-43} \pm 45$ ps for \Lambda, $183 ^{+42}_{-32} \pm 37$ ps for 3\Lambda H, and $140 ^{+48}_{-33}\pm 35 $ ps for 4\Lambda H., Comment: 13 pages, 10 figures, accepted for publication in Nuclear Physics A, v2 : revised few references

Published
2013
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3. Pygmy dipole resonance in 208Pb

Author

Poltoratska, I., von Neumann-Cosel, P., Tamii, A., Adachi, T., Bertulani, C. A., Carter, J., Dozono, M., Fujita, H., Fujita, K., Fujita, Y., Hatanaka, K., Itoh, M., Kawabata, T., Kalmykov, Y., Krumbholz, A. M., Litvinova, E., Matsubara, H., Nakanishi, K., Neveling, R., Okamura, H., Ong, H. J., Özel-Tashenov, B., Ponomarev, V. Yu., Richter, A., Rubio, B., Sakaguchi, H., Sakemi, Y., Sasamoto, Y., Shimbara, Y., Shimizu, Y., Smit, F. D., Suzuki, T., Tameshige, Y., Wambach, J., Yosoi, M., and Zenihiro, J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Scattering of protons of several hundred MeV is a promising new spectroscopic tool for the study of electric dipole strength in nuclei. A case study of 208Pb shows that at very forward angles J^pi = 1- states are strongly populated via Coulomb excitation. A separation from nuclear excitation of other modes is achieved by a multipole decomposition analysis of the experimental cross sections based on theoretical angular distributions calculated within the quasiparticle-phonon model. The B(E1) transition strength distribution is extracted for excitation energies up to 9 MeV, i.e., in the region of the so-called pygmy dipole resonance (PDR). The Coulomb-nuclear interference shows sensitivity to the underlying structure of the E1 transitions, which allows for the first time an experimental extraction of the electromagnetic transition strength and the energy centroid of the PDR., Comment: submitted to Phys. Rev. C

Published
2012
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4. Complete electric dipole response and the neutron skin in 208Pb

Author

Tamii, A., Poltoratska, I., von Neumann-Cosel, P., Fujita, Y., Adachi, T., Bertulani, C. A., Carter, J., Dozono, M., Fujita, H., Fujita, K., Hatanaka, K., Heilmann, A. M., Ishikawa, D., Itoh, M., Ong, H. J., Kawabata, T., Kalmykov, Y., Litvinova, E., Matsubara, H., Nakanishi, K., Neveling, R., Okamura, H., Özel-Tashenov, B., Ponomarev, V. Yu., Richter, A., Rubio, B., Sakaguchi, H., Sakemi, Y., Sasamoto, Y., Shimbara, Y., Shimizu, Y., Smit, F. D., Suzuki, T., Tameshige, Y., Wambach, J., Yamada, R., Yosoi, M., and Zenihiro, J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

A benchmark experiment on 208Pb shows that polarized proton inelastic scattering at very forward angles including 0{\deg} is a powerful tool for high-resolution studies of electric dipole (E1) and spin magnetic dipole (M1) modes in nuclei over a broad excitation energy range to test up-to-date nuclear models. The extracted E1 polarizability leads to a neutron skin thickness r_skin = 0.156+0.025-0.021 fm in 208Pb derived within a mean-field model [Phys. Rev. C 81, 051303 (2010)], thereby constraining the symmetry energy and its density dependence, relevant to the description of neutron stars., Comment: 5 pages, 5 figures, revised mansucript

Published
2011
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5. Exclusive electroproduction of K+ Lambda and K+ Sigma^0 final states at Q^2 = 0.030-0.055 (GeV/c)^2

Author

Achenbach, P., Gayoso, C. Ayerbe, Bernauer, J. C., Bianchin, S., Böhm, R., Borodina, O., Bösz, M., Bosnar, D., Bozkurt, V., Bydžovský, P., Debenjak, L., Distler, M. O., Esser, A., Friščić, I., Göküzüm, B., de la Paz, M. Gómez Rodríguez, Grießinger, K., Jennewein, P., Kim, E., Makek, M., Merkel, H., Minami, S., Müller, U., Nakajima, D., Nungesser, L., Özel-Tashenov, B., Pochodzalla, J., Potokar, M., Rappold, Ch., Saito, T. R., Majos, S. Sánchez, Schlimme, B. S., Širca, S., Weinriefer, M., and Yoon, C. J.

Subjects
Nuclear Experiment
Abstract

Cross section measurements of the exclusive p(e,e'K+)Lambda,Sigma^0 electroproduction reactions have been performed at the Mainz Microtron MAMI in the A1 spectrometer facility using for the first time the Kaos spectrometer for kaon detection. These processes were studied in a kinematical region not covered by any previous experiment. The nucleon was probed in its third resonance region with virtual photons of low four-momenta, Q^2= 0.030-0.055 (GeV/c)^2. The MAMI data indicate a smooth transition in Q^2 from photoproduction to electroproduction cross sections. Comparison with predictions of effective Lagrangian models based on the isobar approach reveal that strong longitudinal couplings of the virtual photon to the N* resonances can be excluded from these models., Comment: 16 pages, 7 figures

Published
2011
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7. Production of hypernuclei in peripheral HI collisions: The HypHI project at GSI

Author

Saito, T.R., Nakajima, D., Rappold, C., Bianchin, S., Borodina, O., Bozkurt, V., Göküzüm, B., Kavatsyuk, M., Kim, E., Ma, Y., Maas, F., Minami, S., Özel-Tashenov, B., Achenbach, P., Ajimura, S., Aumann, T., Gayoso, C. Ayerbe, Bhang, H.C., Caesar, C., Erturk, S., Fukuda, T., Guliev, E., Hayashi, Y., Hiraiwa, T., Hoffmann, J., Ickert, G., Ketenci, Z.S., Khaneft, D., Kim, M., Kim, S., Koch, K., Kurz, N., Le Fevre, A., Mizoi, Y., Moritsu, M., Nagae, T., Nungesser, L., Okamura, A., Ott, W., Pochodzalla, J., Sakaguchi, A., Sako, M., Schmidt, C.J., Sekimoto, M., Simon, H., Sugimura, H., Takahashi, T., Tambave, G.J., Tamura, H., Trautmann, W., Voltz, S., Yokota, N., Yoon, C.J., and Yoshida, K.

Published
2012
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9. First measurements of Λ and [formula omitted] hyperons in elementary electroproduction at MAMI

Author

Achenbach, P., Gayoso, C. Ayerbe, Bernauer, J.C., Bianchin, S., Böhm, R., Borodina, O., Bosnar, D., Bozkurt, V., Debenjak, L., Denig, A., Distler, M.O., Esser, A., Fonvieille, H., Friščić, I., Göküzüm, B., Grießinger, K., Kim, E., Maas, F.E., Makek, M., Merkel, H., Minami, S., Müller, U., Nakajima, D., Nungesser, L., Özel-Tashenov, B., Pochodzalla, J., Potokar, M., Rappold, Ch., Saito, T.R., Sánchez Majos, S., Schlimme, B.S., Širca, S., and Weinriefer, M.

Published
2010
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10. The HypHI Phase 0 experiment

Author

Saito, T.R., Bianchin, S., Borodina, O., Bozkurt, V., Göküzüm, B., Kavatsyuk, M., Kim, E., Minami, S., Nakajima, D., Özel-Tashenov, B., Rappold, C., Achenbach, P., Ajimura, S., Aumann, T., Caesar, C., Erturk, S., Fukuda, T., Guliev, E., Hayashi, Y., Hiraiwa, T., Hoffmann, J., Ickert, G., Ketenci, Z.S., Khaneft, D., Kim, M., Kim, S., Koch, K., Kurz, N., Ma, Y., Maas, F., Mizoi, S., Moritsu, M., Nagae, T., Okamura, A., Ott, W., Pochodzalla, J., Sakaguchi, A., Sako, M., Schmidt, C.J., Sekimoto, M., Simon, H., Sugimura, H., Takahashi, T., Tambave, G.J., Tanida, K., Tamura, K., Träger, M., Trautmann, W., Voltz, S., Yoon, C.J., and Yoshida, K.

Published
2010
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11. Scintillating fiber detectors for the HypHI project at GSI

Author

Nakajima, D., Özel-Tashenov, B., Bianchin, S., Borodina, O., Bozkurt, V., Göküzüm, B., Kavatsyuk, M., Minami, S., Rappold, C., Saito, T.R., Achenbach, P., Ajimura, S., Ayerbe, C., Fukuda, T., Hayashi, Y., Hiraiwa, T., Hoffmann, J., Koch, K., Kurz, N., Lepyoshkina, O., Maas, F., Mizoi, Y., Mochizuki, T., Moritsu, M., Nagae, T., Nungesser, L., Okamura, A., Ott, W., Pochodzalla, J., Sakaguchi, A., Sako, M., Schmidt, C.J., Sugimura, H., Tanida, K., Träger, M., Trautmann, W., and Voltz, S.

Published
2009
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13. Exclusive electroproduction of K+Λ and K+Σ0 final states at Q2 = 0.030–0.055 (GeV/c)2

Author

Achenbach, P., Ayerbe Gayoso, C., Bernauer, J. C., Bianchin, S., Böhm, R., Borodina, O., Bosnar, D., Bösz, M., Bozkurt, V., Bydžovský, P., Debenjak, L., Distler, M. O., Esser, A., Friščić, I., Gómez Rodríguez, M., Göküzüm, B., Grießinger, K., Jennewein, P., Kim, E., Makek, M., Merkel, H., Minami, S., Müller, U., Nakajima, D., Nungesser, L., Özel-Tashenov, B., Pochodzalla, J., Rappold, Ch., Saito, T. R., Sánchez Majos, S., Schlimme, B. S., Širca, S., Weinriefer, M., Yoon, C. J., and A1 Collaboration

Published
2012
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14. Hypernuclear production cross section in the reaction of 6Li + 12C at 2 A GeV

Author

Rappold, C., Saito, T.R., Bertini, O., Bianchin, S., Bozkurt, V., Kim, E., Kavatsyuk, M., Ma, Y., Maas, F., Minami, S., Nakajima, D., Özel-Tashenov, B., Yoshida, K., Achenbach, P., Ajimura, S., Aumann, T., Ayerbe Gayoso, C., Bhang, H.C., Caesar, C., Erturk, S., Fukuda, T., Göküzüm, B., Guliev, E., Hoffmann, J., Ickert, G., Ketenci, Z.S., Khaneft, D., Kim, M., Kim, S., Koch, K., Kurz, N., Le Fèvre, A., Mizoi, Y., Nungesser, L., Ott, W., Pochodzalla, J., Sakaguchi, A., Schmidt, C.J., Sekimoto, M., Simon, H., Takahashi, T., Tambave, G.J., Tamura, H., Trautmann, W., Voltz, S., and Yoon, C.J.

Published
2015
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15. Hypernuclear production cross section in the reaction of Li + C at 2 GeV

Author

Rappold, C., Saito, T.R., Bertini, O., Bianchin, S., Bozkurt, V., Kim, E., Kavatsyuk, M., Ma, Y., Maas, F., Minami, S., Nakajima, D., Özel-Tashenov, B., Yoshida, K., Achenbach, P., Ajimura, S., Aumann, T., Ayerbe Gayoso, C., Bhang, H.C., Caesar, C., Erturk, S., Fukuda, T., Göküzüm, B., Guliev, E., Hoffmann, J., Ickert, G., Ketenci, Z.S., Khaneft, D., Kim, M., Kim, S., Koch, K., Kurz, N., Le Fèvre, A., Mizoi, Y., Nungesser, L., Ott, W., Pochodzalla, J., Sakaguchi, A., Schmidt, C.J., Sekimoto, M., Simon, H., Takahashi, T., Tambave, G.J., Tamura, H., Trautmann, W., Voltz, S., and Yoon, C.J.

Abstract

Hypernuclear production cross sections have been deduced for the first time with induced reaction of heavy ion beam on fixed target and by means of the invariant mass method by the HypHI Collaboration exploiting the reaction of 6Li + 12C at 2A GeV or sNN=2.70 GeV. A production cross section of 3.9±1.4 μb for 3ΛH and of 3.1±1.0 μb for 4ΛH respectively in the projectile rapidity region was inferred as well as the total production cross section of the Λ hyperon was measured and found to be equal to 1.7±0.8 mb. A global fit based on a Bayesian approach was performed in order to include and propagate statistical and systematic uncertainties. Production ratios of 3ΛH/4ΛH, 3ΛH/Λ and 4ΛH/Λ were included in the inference procedure. The strangeness population factors S$_{3}$ and S$_{4}$ of 3ΛH and 4ΛH respectively were extracted. In addition, the multiplicities of the Λ hyperon, 3ΛH, and 4ΛH together with the rapidity and transversal momentum density distributions of the observed hypernuclei were extracted and reported.

Published
2015

16. Hypernuclear production cross section in the reaction of $^{6}$Li + $^{12}$C at 2AGeV

Author

Rappold, C., Saito, Takehiko, Nakajima, D., Özel-Tashenov, B., Yoshida, K., Achenbach, P., Ajimura, S., Aumann, T., Ayerbe Gayoso, C., Bhang, H. C., Caesar, C., Erturk, S., Bertini, O., Fukuda, T., Göküzüm, B., Guliev, E., Hoffmann, J., Ickert, G., Ketenci, Z. S., Khaneft, Dmitry, Kim, M., Kim, S., Koch, K., Bianchin, S., Kurz, N., Le Fèvre, A., Mizoi, Y., Nungesser, L., Ott, W., Pochodzalla, J., Sakaguchi, A., Schmidt, C. J., Sekimoto, M., Simon, H., Bozkurt, V., Takahashi, T., Tambave, G. J., Tamura, H., Trautmann, W., Voltz, S., Yoon, C. J., Kim, E., Kavatsyuk, M., Ma, Y., Maas, F., and Minami, S.

Subjects
ddc:530
Abstract

Physics letters / B 747, 129 - 134 (2015). doi:10.1016/j.physletb.2015.05.059, Published by North-Holland Publ., Amsterdam

Published
2015
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18. First measurements of Lambda and Sigma0 hyperons in elementary electroproduction at MAMI

Author

Achenbach, P., Ayerbe Gayoso, C., Bernauer, J.C., Bianchin, S., Böhm, R., Borodina, O., Bosnar, D., Bozkurt, V., Debenjak, L., Denig, A., Distler, M.O., Essera, A., Fonvieille, H., Friščić, I., Göküzüm, B., Grießinger, K., Kim, E., Maas, F.E., Makek, M., Merkel, H., Minami, S., Müller, U., Nakajima, D., Nungesser, L., Özel-Tashenov, B., Pochodzalla, J., Potokar, M., Rappold, Ch., Saito, T.R., Sánchez Majos, S., Schlimme, B.S., Širca, S., Weinriefera, M., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and MAMI-A1

Subjects
Missing mass spectroscopy, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Electroproduction reactions, Kaon, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2009
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19. Low-energy dipole strength inSn112,120

Author

Özel-Tashenov, B., primary, Enders, J., additional, Lenske, H., additional, Krumbholz, A. M., additional, Litvinova, E., additional, von Neumann-Cosel, P., additional, Poltoratska, I., additional, Richter, A., additional, Rusev, G., additional, Savran, D., additional, and Tsoneva, N., additional

Published
2014
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20. Search for evidence ofΛ3nby observingd+π−andt+π−final states in the reaction of6Li+12C at2AGeV

Author

Rappold, C., primary, Kim, E., additional, Saito, T. R., additional, Bertini, O., additional, Bianchin, S., additional, Bozkurt, V., additional, Kavatsyuk, M., additional, Ma, Y., additional, Maas, F., additional, Minami, S., additional, Nakajima, D., additional, Özel-Tashenov, B., additional, Yoshida, K., additional, Achenbach, P., additional, Ajimura, S., additional, Aumann, T., additional, Ayerbe Gayoso, C., additional, Bhang, H. C., additional, Caesar, C., additional, Erturk, S., additional, Fukuda, T., additional, Göküzüm, B., additional, Guliev, E., additional, Hoffmann, J., additional, Ickert, G., additional, Ketenci, Z. S., additional, Khaneft, D., additional, Kim, M., additional, Kim, S., additional, Koch, K., additional, Kurz, N., additional, Le Fèvre, A., additional, Mizoi, Y., additional, Nungesser, L., additional, Ott, W., additional, Pochodzalla, J., additional, Sakaguchi, A., additional, Schmidt, C. J., additional, Sekimoto, M., additional, Simon, H., additional, Takahashi, T., additional, Tambave, G. J., additional, Tamura, H., additional, Trautmann, W., additional, Voltz, S., additional, and Yoon, C. J., additional

Published
2013
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21. Hypernuclear spectroscopy of products from 6Li projectiles on a carbon target at 2A GeV

Author

Rappold, C., primary, Kim, E., additional, Nakajima, D., additional, Saito, T.R., additional, Bertini, O., additional, Bianchin, S., additional, Bozkurt, V., additional, Kavatsyuk, M., additional, Ma, Y., additional, Maas, F., additional, Minami, S., additional, Özel-Tashenov, B., additional, Yoshida, K., additional, Achenbach, P., additional, Ajimura, S., additional, Aumann, T., additional, Ayerbe Gayoso, C., additional, Bhang, H.C., additional, Caesar, C., additional, Erturk, S., additional, Fukuda, T., additional, Göküzüm, B., additional, Guliev, E., additional, Hiraiwa, T., additional, Hoffmann, J., additional, Ickert, G., additional, Ketenci, Z.S., additional, Khaneft, D., additional, Kim, M., additional, Kim, S., additional, Koch, K., additional, Kurz, N., additional, Le Fèvre, A., additional, Mizoi, Y., additional, Moritsu, M., additional, Nagae, T., additional, Nungesser, L., additional, Okamura, A., additional, Ott, W., additional, Pochodzalla, J., additional, Sakaguchi, A., additional, Sako, M., additional, Schmidt, C.J., additional, Sekimoto, M., additional, Simon, H., additional, Sugimura, H., additional, Takahashi, T., additional, Tambave, G.J., additional, Tamura, H., additional, Trautmann, W., additional, Voltz, S., additional, Yokota, N., additional, and Yoon, C.J., additional

Published
2013
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22. Pygmy dipole resonance in208Pb

Author

Poltoratska, I., primary, von Neumann-Cosel, P., additional, Tamii, A., additional, Adachi, T., additional, Bertulani, C. A., additional, Carter, J., additional, Dozono, M., additional, Fujita, H., additional, Fujita, K., additional, Fujita, Y., additional, Hatanaka, K., additional, Itoh, M., additional, Kawabata, T., additional, Kalmykov, Y., additional, Krumbholz, A. M., additional, Litvinova, E., additional, Matsubara, H., additional, Nakanishi, K., additional, Neveling, R., additional, Okamura, H., additional, Ong, H. J., additional, Özel-Tashenov, B., additional, Ponomarev, V. Yu., additional, Richter, A., additional, Rubio, B., additional, Sakaguchi, H., additional, Sakemi, Y., additional, Sasamoto, Y., additional, Shimbara, Y., additional, Shimizu, Y., additional, Smit, F. D., additional, Suzuki, T., additional, Tameshige, Y., additional, Wambach, J., additional, Yosoi, M., additional, and Zenihiro, J., additional

Published
2012
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23. Complete Electric Dipole Response and the Neutron Skin inPb208

Author

Tamii, A., primary, Poltoratska, I., additional, von Neumann-Cosel, P., additional, Fujita, Y., additional, Adachi, T., additional, Bertulani, C. A., additional, Carter, J., additional, Dozono, M., additional, Fujita, H., additional, Fujita, K., additional, Hatanaka, K., additional, Ishikawa, D., additional, Itoh, M., additional, Kawabata, T., additional, Kalmykov, Y., additional, Krumbholz, A. M., additional, Litvinova, E., additional, Matsubara, H., additional, Nakanishi, K., additional, Neveling, R., additional, Okamura, H., additional, Ong, H. J., additional, Özel-Tashenov, B., additional, Ponomarev, V. Yu., additional, Richter, A., additional, Rubio, B., additional, Sakaguchi, H., additional, Sakemi, Y., additional, Sasamoto, Y., additional, Shimbara, Y., additional, Shimizu, Y., additional, Smit, F. D., additional, Suzuki, T., additional, Tameshige, Y., additional, Wambach, J., additional, Yamada, R., additional, Yosoi, M., additional, and Zenihiro, J., additional

Published
2011
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24. First measurements of Λ and hyperons in elementary electroproduction at MAMI

Author

Achenbach, P., primary, Gayoso, C. Ayerbe, additional, Bernauer, J.C., additional, Bianchin, S., additional, Böhm, R., additional, Borodina, O., additional, Bosnar, D., additional, Bozkurt, V., additional, Debenjak, L., additional, Denig, A., additional, Distler, M.O., additional, Esser, A., additional, Fonvieille, H., additional, Friščić, I., additional, Göküzüm, B., additional, Grießinger, K., additional, Kim, E., additional, Maas, F.E., additional, Makek, M., additional, Merkel, H., additional, Minami, S., additional, Müller, U., additional, Nakajima, D., additional, Nungesser, L., additional, Özel-Tashenov, B., additional, Pochodzalla, J., additional, Potokar, M., additional, Rappold, Ch., additional, Saito, T.R., additional, Sánchez Majos, S., additional, Schlimme, B.S., additional, Širca, S., additional, and Weinriefer, M., additional

Published
2010
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25. Low-energy dipole strength in 112,120Sn.

Author

Özel-Tashenov, B., Enders, J., Lenske, H., Krumbholz, A. M., Litvinova, E., von Neumann-Cosel, P., Poltoratska, I., Richter, A., Rusev, G., Savran, D., and Tsoneva, N.

Subjects
*ELECTRIC dipole moments, *BREMSSTRAHLUNG, *STATISTICAL models, *FLUCTUATIONS (Physics), *SPIN-phonon interactions, *TIN isotopes
Abstract

The 112,l20Sn(y,y') reactions below the neutron separation energies have been studied at the superconducting Darmstadt electron linear accelerator S-DALINAC for different endpoint energies of the incident bremsstrahlung spectrum. Dipole strength distributions are extracted for 112Sn up to 9.5 MeV and for 120Sn up to 9.1 MeV. A concentration of dipole excitations is observed between 5 and 8 MeV in both nuclei. Missing strength due to unobserved decays to excited states is estimated in a statistical model. A fluctuation analysis is applied to the photon scattering spectra to extract the amount of the unresolved strength hidden in the background due to fragmentation. The strength distributions are discussed within different model approaches such as the quasiparticle-phonon model and the relativistic time blocking approximation, allowing for an inclusion of complex configurations beyond the initial particle-hole states. While a satisfactory description of the fragmentation can be achieved for sufficiently large model spaces, the predicted centroids and total electric dipole strengths for stable tin isotopes strongly depend on the assumptions about the underlying mean field. [ABSTRACT FROM AUTHOR]

Published
2014
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26. Hypernuclear spectroscopy of products from 6Li projectiles on a carbon target at.

Author

Rappold, C., Kim, E., Nakajima, D., Saito, T.R., Bertini, O., Bianchin, S., Bozkurt, V., Kavatsyuk, M., Ma, Y., Maas, F., Minami, S., Özel-Tashenov, B., Yoshida, K., Achenbach, P., Ajimura, S., Aumann, T., Ayerbe Gayoso, C., Bhang, H.C., Caesar, C., and Erturk, S.

Subjects
*NUCLEAR spectroscopy, *LITHIUM isotopes, *CARBON, *TARGETING (Nuclear strategy), *NUCLEAR physics experiments, *HEAVY ions
Abstract

Abstract: A novel experiment, aiming at demonstrating the feasibility of hypernuclear spectroscopy with heavy ion beams, was conducted. Using the invariant mass method, the spectroscopy of hypernuclear products of 6Li projectiles on a carbon target at was performed. Signals of the Λ-hyperon and and hypernuclei were observed for final states of , and , respectively, with significance values of 6.7, 4.7 and 4.9σ. By analyzing the proper decay time from secondary vertex distribution with the unbinned maximum likelihood fitting method, their lifetime values were deduced to be for Λ, for , and for . [Copyright &y& Elsevier]

Published
2013
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