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1. Axial and triaxial degrees of freedom in 72Zn

Author

Hellgartner, S, Mücher, D, Wimmer, K, Bildstein, V, Egido, JL, Gernhäuser, R, Krücken, R, Nowak, AK, Zielińska, M, Bauer, C, Benito, MLL, Bottoni, S, De Witte, H, Elseviers, J, Fedorov, D, Flavigny, F, Illana, A, Klintefjord, M, Kröll, T, Lutter, R, Marsh, B, Orlandi, R, Pakarinen, J, Raabe, R, Rapisarda, E, Reichert, S, Reiter, P, Scheck, M, Seidlitz, M, Siebeck, B, Siesling, E, Steinbach, T, Stora, T, Vermeulen, M, Voulot, D, Warr, N, and Wenander, FJC

Subjects
Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

The unstable N=42 nucleus 72Zn has been studied using multiple safe Coulomb excitation in inverse kinematics. The experiment was performed at the REX-ISOLDE facility at CERN making first use of the silicon detector array C-REX in combination with the γ-ray spectrometer Miniball. The high angular coverage of C-REX allowed to determine the reduced transition strengths for the decay of the yrast 01+, 21+ and 41+ as well as of the 02+ and 22+ states in 72Zn. The quadrupole moments of the 21+, 41+ and 22+ states were extracted. Using model independent quadrupole invariants, the ground state of 72Zn was found to have an average deformation in the γ degree of freedom close to maximum triaxiality. In comparison to experimental data in zinc isotopes with N

Published
2023

2. Spectroscopy of 46Ar by the (t,p) two-neutron transfer reaction

Author

Nowak, K., Wimmer, K., Hellgartner, S., Mücher, D., Bildstein, V., Diriken, J., Elseviers, J., Gaffney, L. P., Gernhäuser, R., Iwanicki, J., Johansen, J. G., Huyse, M., Konki, J., Krücken, T. Kröll R., Lutter, R., Orlandi, R., Pakarinen, J., Raabe, R., Reiter, P., Roger, T., Schrieder, G., Seidlitz, M., Sorlin, O., Van Duppen, P., Warr, N., De Witte, H., and Zielinska, M.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

States in the $N=28$ nucleus $^{46}$Ar have been studied by a two-neutron transfer reaction at REX-ISOLDE (CERN). A beam of radioactive $^{44}$ at an energy of 2.16~AMeV and a tritium loaded titanium target were used to populate $^{46}$ by the t($^{44}$,p) two-neutron transfer reaction. Protons emitted from the target were identified in the T-REX silicon detector array. The excitation energies of states in $^{46}$ have been reconstructed from the measured angles and energies of recoil protons. Angular distributions for three final states were measured and based on the shape of the differential cross section an excited state at 3695~keV has been identified as $J^\pi = 0^+$. The angular differential cross section for the population of different states are compared to calculations using a reaction model employing both sequential and direct transfer of two neutrons. Results are compared to shell model calculations using state-of-the-art effective interactions., Comment: 10 pages, 12 figures, PRC accepted

Published
2016
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3. Study of bound states in ¹⁰Be by one neutron removal reactions of ¹¹Be

Author

Johansen, Jacob G., Bildstein, V., Borge, M. J. G., Cubero, M., Diriken, J., Elseviers, J., Fraile, L. M., Fynbo, H. O. U., Gaffney, L. P., Gernhäuser, R., Jonson, B., Koldste, G. T., Konki, J., Kröll, T., Krücken, R., Mücher, D., Nilsson, T., Nowak, K., Pakarinen, J., Pesudo, V., Raabe, R., Riisager, K., Seidlitz, M., Tengblad, O., Törnqvist, H., Voulot, D., Warr, N., Wimmer, K., De Witte, H., Johansen, Jacob G., Bildstein, V., Borge, M. J. G., Cubero, M., Diriken, J., Elseviers, J., Fraile, L. M., Fynbo, H. O. U., Gaffney, L. P., Gernhäuser, R., Jonson, B., Koldste, G. T., Konki, J., Kröll, T., Krücken, R., Mücher, D., Nilsson, T., Nowak, K., Pakarinen, J., Pesudo, V., Raabe, R., Riisager, K., Seidlitz, M., Tengblad, O., Törnqvist, H., Voulot, D., Warr, N., Wimmer, K., and De Witte, H.

Abstract

The bound states of ¹⁰Be have been studied by removing single neutrons from ¹¹Be nuclei. A 2.8 MeV u⁻¹ beam of ¹¹Be was produced at ISOLDE, CERN and directed on to both proton and deuteron targets inducing one-neutron removal reactions. Charged particles were detected to identify the two reaction channels (d, t) and (p, d), and the individual states in ¹⁰Be were identified by gamma detection. All bound states but one were populated and identified in the (d, t) reaction. The combination of REX-ISOLDE and MINIBALL allowed for a clean separation of the high-lying states in ¹⁰Be. This is the first time these states have been separated in a reaction experiment. Differential cross sections have been calculated for all the reaction channels and compared to DWBA calculations. Spectroscopic factors are derived and compared to values from the litterature. While the overall agreement between the spectrocopic factors is poor, the ratio between the ground state and the first excited state is in agreement with the previous measured ones. Furthermore, a significant population of the 2⁺₂ state is observed, which which may indicate the presence of multi-step processes at our beam energy.

Published
2024

4. In-gas-cell laser ionization spectroscopy in the vicinity of 100Sn: Magnetic moments and mean-square charge radii of N=50-54 Ag

Author

Ferrer, R., Bree, N., Cocolios, T. E., Darby, I. G., De Witte, H., Dexters, W., Diriken, J., Elseviers, J., Franchoo, S., Huyse, M., Kesteloot, N., Kudryavtsev, Yu., Pauwels, D., Radulov, D., Roger, T., Savajols, H., Van Duppen, P., and Venhart, M.

Subjects
Nuclear Experiment, Physics - Atomic Physics
Abstract

In-gas-cell laser ionization spectroscopy studies on the neutron deficient 97-101Ag isotopes have been performed with the LISOL setup. Magnetic dipole moments and mean-square charge radii have been determined for the first time with the exception of 101Ag, which was found in good agreement with previous experimental values. The reported results allow tentatively assigning the spin of 97,99Ag to 9/2 and confirming the presence of an isomeric state in these two isotopes, whose collapsed hyperfine structure suggests a spin of 1/2 . The effect of the N=50 shell closure is not only manifested in the magnetic moments but also in the evolution of the mean-square charge radii of the isotopes investigated, in accordance with the spherical droplet model predictions.

Published
2013
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5. Study of bound states in 12Be through low-energy 11Be(d,p)-transfer reactions

Author

Johansen, J. G., Bildstein, V., Borge, M. J. G., Cubero, M., Diriken, J., Elseviers, J., Fraile, L. M., Fynbo, H. O. U., Gaffney, L. P., Gernhäuser, R., Jonson, B., Koldste, G. T., Konki, J., Kröll, T., Krücken, R., Mücher, D., Nilsson, T., Nowak, K., Pakarinen, J., Pesudo, V., Raabe, R., Riisager, K., Seidlitz, M., Tengblad, O., Törnqvist, H., Voulot, D., Warr, N., Wenander, F., Wimmer, K., and De Witte, H.

Subjects
Nuclear Experiment
Abstract

The bound states of 12Be have been studied through a 11Be(d,p)12Be transfer reaction experiment in inverse kinematics. A 2.8 MeV/u beam of 11Be was produced using the REX-ISOLDE facility at CERN. The outgoing protons were detected with the T-REX silicon detector array. The MINIBALL germanium array was used to detect gamma rays from the excited states in 12Be. The gamma-ray detection enabled a clear identification of the four known bound states in 12Be, and each of the states has been studied individually. Differential cross sections over a large angular range have been extracted. Spectroscopic factors for each of the states have been determined from DWBA calculations and have been compared to previous experimental and theoretical results.

Published
2013
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6. Magnetic dipole moment of 57,59Cu measured by in-gas-cell laser spectroscopy

Author

Cocolios, T. E., Andreyev, A. N., Bastin, B., Bree, N., Buscher, J., Elseviers, J., Gentens, J., Huyse, M., Kudryavtsev, Yu., Pauwels, D., Sonoda, T., Bergh, P. Van den, and Van Duppen, P.

Subjects
Nuclear Experiment
Abstract

In-gas-cell laser spectroscopy study of the 57,59,63,65Cu isotopes has been performed for the first time using the 244.164 nm optical transition from the atomic ground state of copper. The nuclear magnetic dipole moments for 57,59,65Cu relative to that of 63Cu have been extracted. The new value for 57Cu of mu(57Cu) = +2.582(7)mu_N is in strong disagreement with the previous literature value but in good agreement with recent theoretical and systematic predictions.

Published
2009
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7. Axial and triaxial degrees of freedom in 72Zn

Author

Hellgartner, S., primary, Mücher, D., additional, Wimmer, K., additional, Bildstein, V., additional, Egido, J.L., additional, Gernhäuser, R., additional, Krücken, R., additional, Nowak, A.K., additional, Zielińska, M., additional, Bauer, C., additional, Benito, M.L.L., additional, Bottoni, S., additional, De Witte, H., additional, Elseviers, J., additional, Fedorov, D., additional, Flavigny, F., additional, Illana, A., additional, Klintefjord, M., additional, Kröll, T., additional, Lutter, R., additional, Marsh, B., additional, Orlandi, R., additional, Pakarinen, J., additional, Raabe, R., additional, Rapisarda, E., additional, Reichert, S., additional, Reiter, P., additional, Scheck, M., additional, Seidlitz, M., additional, Siebeck, B., additional, Siesling, E., additional, Steinbach, T., additional, Stora, T., additional, Vermeulen, M., additional, Voulot, D., additional, Warr, N., additional, and Wenander, F.J.C., additional

Published
2023
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8. Axial and triaxial degrees of freedom in Zn

Author

Hellgartner, S., Mücher, D., Wimmer, K., Bildstein, V., Egido, J.L., Gernhäuser, R., Krücken, R., Nowak, A.K., Zielińska, M., Bauer, C., Benito, M.L.L., Bottoni, S., De Witte, H., Elseviers, J., Fedorov, D., Flavigny, F., Illana, A., Klintefjord, M., Kröll, T., Lutter, R., Marsh, B., Orlandi, R., Pakarinen, J., Raabe, R., Rapisarda, E., Reichert, S., Reiter, P., Scheck, M., Seidlitz, M., Siebeck, B., Siesling, E., Steinbach, T., Stora, T., Vermeulen, M., Voulot, D., Warr, N., and Wenander, F.J.C.

Abstract

The unstable N=42 nucleus $^{72}$Zn has been studied using multiple safe Coulomb excitation in inverse kinematics. The experiment was performed at the REX-ISOLDE facility at CERN making first use of the silicon detector array C-REX in combination with the γ-ray spectrometer Miniball. The high angular coverage of C-REX allowed to determine the reduced transition strengths for the decay of the yrast 01+, 21+ and 41+ as well as of the 02+ and 22+ states in $^{72}$Zn. The quadrupole moments of the 21+, 41+ and 22+ states were extracted. Using model independent quadrupole invariants, the ground state of $^{72}$Zn was found to have an average deformation in the γ degree of freedom close to maximum triaxiality. In comparison to experimental data in zinc isotopes with N<40, the collectivity of the 41+ state in neutron-rich $^{72}$Zn is significantly larger, indicating a collective yrast band based on the ground state of $^{72}$Zn. In contrast, a low experimental B(E2;02+→21+) strength was determined, indicating a different structure for the 02+ state. Shell-model calculations propose a 02+ state featuring a larger fraction of the (spherical) N=40 closed-shell configuration in its wave function than for the 01+ ground state.The results were also compared with beyond mean field calculations which corroborate the large deformation in the γ degree of freedom, while pointing to a more deformed 02+ state. These experimental and theoretical findings establish the importance of the γ degree of freedom in the ground state of $^{72}$Zn, located between the $^{68,70}$Ni nuclei that have spherical ground states, and $^{76}$Ge, which has a rigid triaxial shape.

Published
2023

9. alpha-decay properties of Fr-200,Fr-202

Author

Ghys, L, Andreyev, AN, Huyse, M, Van Duppen, P, Antalic, S, Barzakh, A, Capponi, L, Cocolios, TE, Cubiss, J, Derkx, X, De Witte, H, Elseviers, J, Hessberger, FP, Kalaninova, Z, Koster, U, Lane, JFW, Liberati, V, Mitsuoka, S, Nagame, Y, Nishio, K, Ota, S, Pauwels, D, Page, RD, Popescu, L, Radulov, D, Rajabali, MM, Rapisarda, E, Sandhu, K, Truesdale, VL, Van den Bergh, P, and Wakabayashi, Y

Published
2019

10. Microscopic structure of coexisting 0(+) states in Ni-68 probed via two-neutron transfer

Author

Flavigny, F., Elseviers, J., Andreyev, A. N., Bauer, C., Bildstein, V., Blazhev, A., Brown, B. A., De Witte, H., Diriken, J., Fedosseev, V. N., Franchoo, S., Gernhaeuser, R., Huyse, M., Ilieva, S., Klupp, S., Kroell, Th., Lutter, R., Marsh, B. A., Muecher, D., Nowak, K., Otsuka, T., Pakarinen, J., Patronis, N., Raabe, R., Recchia, F., Reiter, P., Roger, T., Sambi, S., Seidlitz, M., Seliverstov, M. D., Siebeck, B., Tsunoda, Y., Van Duppen, P., Vermeulen, M., Von Schmid, M., Voulot, D., Warr, N., Wenander, F., Wimmer, K., and Helsinki Institute of Physics

Subjects
114 Physical sciences
Abstract

The structure of low-spin states originating from shape-coexisting configurations in Ni-68(40)28 was directly probed via the two-neutron transfer reaction Ni-66(t, p)Ni-68 in inverse kinematics using a radioactive ion beam on a radioactive target. The direct feeding to the first excited 0(+) state was measured for center-of-mass angles 4 degrees - 16 degrees and amounts to an integral of 4.2(16)% relative to the ground state. The observed difference in feeding of the 0(+) states is explained by the transfer of neutrons, mainly in the pf shell below N = 40 for the ground state, and across N = 40 in the g(9/2) orbital for the 0(2)(+), based on second-order distorted-wave Born approximation calculations combined with state-of-the-art shell-model two-nucleon amplitudes. However, the direct feeding to the 2(1)(+) state [29(3)%] is incompatible with these calculations.

Published
2019

11. Inverse odd-even staggering in nuclear charge radii and possible octupole collectivity in 217,218,219At revealed by in-source laser spectroscopy

Author

Barzakh, A. E., Cubiss, J. G., Andreyev, A. N., Seliverstov, M. D., Andel, B., Antalic, S., Ascher, P., Atanasov, D., Beck, D., Bieroifmmode nelse, J., Blaum, K., Borgmann, Ch., Breitenfeldt, M., Capponi, L., Cocolios, T. E., Day Goodacre, T., Derkx, X., De Witte, H., Elseviers, J., Fedorov, D. V., Fedosseev, V. N., Fritzsche, S., Gaffney, L. P., George, S., Ghys, L., Heßberger, F. P., Huyse, M., Imai, N., Kalaninová, Z., Kisler, D., Köster, U., Kowalska, M., Kreim, S., Lane, J. F. W., Liberati, V., Lunney, D., Lynch, K. M., Manea, V., Marsh, B. A., Mitsuoka, S., Molkanov, P. L., Nagame, Y., Neidherr, D., Nishio, K., Ota, S., Pauwels, D., Popescu, L., Radulov, D., Rapisarda, E., Revill, J. P., Rosenbusch, M., Rossel, R. E., Rothe, S., Sandhu, K., Schweikhard, L., Sels, S., Truesdale, V. L., Van Beveren, C., Van den Bergh, P., Van Duppen, P., Wakabayashi, Y., Wendt, K. D. A., Wienholtz, F., Whitmore, B. W., Wilson, G. L., Wolf, R. N., and Zuber, K.

Subjects
Physics::Atomic Physics, Präzisionsexperimente - Abteilung Blaum, Nuclear Experiment
Abstract

© 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Hyperfine-structure parameters and isotope shifts for the 795-nm atomic transitions in At217,218,219 have been measured at CERN-ISOLDE, using the in-source resonance-ionization spectroscopy technique. Magnetic dipole and electric quadrupole moments, and changes in the nuclear mean-square charge radii, have been deduced. A large inverse odd-even staggering in radii, which may be associated with the presence of octupole collectivity, has been observed. Namely, the radius of the odd-odd isotope At218 has been found to be larger than the average of its even-N neighbors, At217,219. The discrepancy between the additivity-rule prediction and experimental data for the magnetic moment of At218 also supports the possible presence of octupole collectivity in the considered nuclei. ispartof: Physical Review C vol:99 issue:5 status: published

Published
2019

12. Inverse odd-even staggering in nuclear charge radii and possible octupole collectivity in At-217,At-218,At-219 revealed by in-source laser spectroscopy

Author

Barzakh, AE, Cubiss, JG, Andreyev, AN, Seliverstov, MD, Andel, B, Antalic, S, Ascher, P, Atanasov, D, Beck, D, Bieron, J, Blaum, K, Borgmann, Ch, Breitenfeldt, M, Capponi, L, Cocolios, TE, Goodacre, T Day, Derkx, X, De Witte, H, Elseviers, J, Fedorov, DV, Fedosseev, VN, Fritzsche, S, Gaffney, LP, George, S, Ghys, L, Hessberger, FP, Huyse, M, Imai, N, Kalaninova, Z, Kisler, D, Koester, U, Kowalska, M, Kreim, S, Lane, JFW, Liberati, V, Lunney, D, Lynch, KM, Manea, V, Marsh, BA, Mitsuoka, S, Molkanov, PL, Nagame, Y, Neidherr, D, Nishio, K, Ota, S, Pauwels, D, Popescu, L, Radulov, D, Rapisarda, E, Revi, JP, Rosenbusch, M, Rossel, RE, Rothe, S, Sandhu, K, Schweikhard, L, Sels, S, Truesdale, VL, Van Beveren, C, Van den Bergh, P, Van Duppen, P, Wakabayashi, Y, Wendt, KDA, Wienholtz, F, Whitmore, BW, Wilson, GL, Wolf, RN, and Zuber, K

Published
2019

13. Microscopic structure of coexisting $0^+$ states in $^{68}$Ni probed via two-neutron transfer

Author

Flavigny, F., Elseviers, J., Andreyev, A.N., Bauer, C., Bildstein, V., Blazhev, A., Brown, B.A., De Witte, H., Diriken, J., Fedosseev, V.N., Franchoo, S., Gernhäuser, R., Huyse, M., Ilieva, S., Klupp, S., Kröll, Th., Lutter, R., Marsh, B.A., Mücher, D., Nowak, K., Otsuka, T., Pakarinen, J., Patronis, N., Raabe, R., Recchia, F., Reiter, P., Roger, T., Sambi, S., Seidlitz, M., Seliverstov, M.D., Siebeck, B., Tsunoda, Y., Van Duppen, P., Vermeulen, M., Von Schmid, M., Voulot, D., Warr, N., Wenander, F., Wimmer, K., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
energy levels and level densities, transfer reactions, Nuclear Physics - Experiment, collective levels, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ydinfysiikka, Nuclear Structure
Abstract

© 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. The structure of low-spin states originating from shape-coexisting configurations in Ni284068 was directly probed via the two-neutron transfer reaction Ni66(t,p)Ni68 in inverse kinematics using a radioactive ion beam on a radioactive target. The direct feeding to the first excited 0+ state was measured for center-of-mass angles 4-16 and amounts to an integral of 4.2(16)% relative to the ground state. The observed difference in feeding of the 0+ states is explained by the transfer of neutrons, mainly in the pf shell below N=40 for the ground state, and across N=40 in the g9/2 orbital for the 02+, based on second-order distorted-wave Born approximation calculations combined with state-of-the-art shell-model two-nucleon amplitudes. However, the direct feeding to the 21+ state [29(3)%] is incompatible with these calculations. ispartof: Physical Review C vol:99 issue:5 pages:054332-054332 status: published

Published
2019

14. $\alpha$-decay properties of $^{200,202}$FR

Author

Ghys, L., Andreyev, A. N., Huyse, M., Van Duppen, P., Antalic, S., Barzakh, A., Capponi, L., Cocolios, T. E., Cubiss, J., Derkx, X., De Witte, H., Elseviers, J., Hessberger, F. P., Kalaninová, Z., Köster, U., Lane, J. F. W., Liberati, V., Mitsuoka, S., Nagame, Y., Nishio, K., Ota, S., Pauwels, D., Page, R. D., Popescu, L., Radulov, D., Rajabali, M. M., Rapisarda, E., Sandhu, K., Truesdale, V. L., Van den Bergh, P., Wakabayashi, Y., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Laue-Langevin (ILL), ILL, and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
ddc:530, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Structure
Abstract

International audience; Background: The neutron-deficient lead region provides a range of nuclear phenomena, including isomerism at low energies. This phenomenon can be studied by α decay because the degree of hindrance of α decay provides information on the change in nuclear structure of connected states. Purpose: The aim of this work was to investigate the α-decay properties of $^{200,202}$FR and daughter products. Method: Neutron-deficient francium nuclei are produced at ISOLDE-CERN bombarding a UCx target with 1.4 GeV protons. Surface ionization and mass-separation techniques were employed to provide a pure radioactive ion beam at a radiation-detection setup. Results: Due to the very high statistics and the high beam purity, improved decay data for $^{202}$FR and its daughters were obtained. In particular, this data set allowed us to identify many fine-structure α lines with a relative reduced α-decay width up to five orders of magnitude lower as the strongest ground-to-ground state or isomeric-to-isomeric state α-decay transition. In addition, several half-life values were extracted with similar or better precision as compared with the literature. Conclusions: The observation of crossover transitions positioned the isomeric high-spin level of $^{198}$At at an excitation energy of 265(3) keV. Half-life values of 4.47(5) s and 1.28(10) s were extracted for the ground state and isomeric state of $^{198}$At and 52(3) ms for the ground-state decay of $^{200}$FR. Furthermore, α-decay schemes for Fr202 and its daughter $^{198}$At could be constructed.

Published
2019

15. α -decay properties of $^{200,202}$FR

Author

Ghys, L, Andreyev, AN, Huyse, M, Van Duppen, P, Antalic, S, Barzakh, A, Capponi, L, Cocolios, TE, Cubiss, J, Derkx, X, De Witte, H, Elseviers, J, Hessberger, FP, Kalaninová, Z, Köster, U, Lane, JFW, Liberati, V, Mitsuoka, S, Nagame, Y, Nishio, K, Ota, S, Pauwels, D, Page, RD, Popescu, L, Radulov, D, Rajabali, MM, Rapisarda, E, Sandhu, K, Truesdale, VL, Van den Bergh, P, and Wakabayashi, Y

Subjects
Nuclear Physics - Experiment, Nuclear Experiment
Abstract

Background: The neutron-deficient lead region provides a range of nuclear phenomena, including isomerism at low energies. This phenomenon can be studied by α decay because the degree of hindrance of α decay provides information on the change in nuclear structure of connected states. Purpose: The aim of this work was to investigate the α-decay properties of $^{200,202}$FR and daughter products. Method: Neutron-deficient francium nuclei are produced at ISOLDE-CERN bombarding a UCx target with 1.4 GeV protons. Surface ionization and mass-separation techniques were employed to provide a pure radioactive ion beam at a radiation-detection setup. Results: Due to the very high statistics and the high beam purity, improved decay data for $^{202}$FR and its daughters were obtained. In particular, this data set allowed us to identify many fine-structure α lines with a relative reduced α-decay width up to five orders of magnitude lower as the strongest ground-to-ground state or isomeric-to-isomeric state α-decay transition. In addition, several half-life values were extracted with similar or better precision as compared with the literature. Conclusions: The observation of crossover transitions positioned the isomeric high-spin level of $^{198}$At at an excitation energy of 265(3) keV. Half-life values of 4.47(5) s and 1.28(10) s were extracted for the ground state and isomeric state of $^{198}$At and 52(3) ms for the ground-state decay of $^{200}$FR. Furthermore, α-decay schemes for Fr202 and its daughter $^{198}$At could be constructed.

Published
2019

16. Inverse odd-even staggering in nuclear charge radii and possible octupole collectivity in $^{217,218,219}At$ revealed by in-source laser spectroscopy

Author

Barzakh, A. E., Cubiss, J. G., Andreyev, A. N., Seliverstov, M. D., Adel, B., Antalic, S., Ascher, P., Atanasov, D., Beck, D., Bieroń, Jacek, Blaum, K., Borgmann, Ch., Breitenfeldt, M., Capponi, L., Cocolios, T. E., Day Goodacre, T., Derex, X., De Witte, H., Elseviers, J., Fedorov, D. V., Fedosseev, N. V., Fritzsche, S., Gaffney, L. P., George, S., Ghys, L., Heßberger, F. P., Huyse, M., Imai, N., Kalaninová, Z., Kisler, D., Koster, U., Kowalska, M., Mitsuoka, S., Molkanov, P. L., Nagame, Y., Neidherr, D., Nishio, K., Ota, S., Pauwels, D., Popescu, L., Radulow, D., Rapisarda, E., Revill, J. P., Rosenbusch, M., Rossel, R. E., Rothe, S., Sandhu, K., Schweikhard, L., Sels, S., Truesdale, V. L., Van Beveren, C., Van den Bergh, P., Van Duppen, P., Wakabayashi, Y., Wendt, K. D. A., Wienholtz, F., Whitmore, B. W., Wilson, G. L., Wolf, R. N., and Zuber, K.

Published
2019

17. Inverse odd-even staggering in nuclear charge radii and possible octupole collectivity in $^{217,218,219}\mathrm{At}$ revealed by in-source laser spectroscopy

Author

Barzakh, A.E., Cubiss, J.G., Andreyev, A.N., Seliverstov, M.D., Andel, B., Antalic, S., Ascher, P., Atanasov, D., Beck, D., Bieroń, J., Blaum, K., Borgmann, Ch., Breitenfeldt, M., Capponi, L., Cocolios, T.E., Day Goodacre, T., Derkx, X., De Witte, H., Elseviers, J., Fedorov, D.V., Fedosseev, V.N., Fritzsche, S., Gaffney, L.P., George, S., Ghys, L., Heßberger, F.P., Huyse, M., Imai, N., Kalaninová, Z., Kisler, D., Köster, U., Kowalska, M., Kreim, S., Lane, J.F.W., Liberati, V., Lunney, D., Lynch, K.M., Manea, V., Marsh, B.A., Mitsuoka, S., Molkanov, P.L., Nagame, Y., Neidherr, D., Nishio, K., Ota, S., Pauwels, D., Popescu, L., Radulov, D., Rapisarda, E., Revill, J.P., Rosenbusch, M., Rossel, R.E., Rothe, S., Sandhu, K., Schweikhard, L., Sels, S., Truesdale, V.L., Van Beveren, C., Van Den Bergh, P., Van Duppen, P., Wakabayashi, Y., Wendt, K.D.A., Wienholtz, F., Whitmore, B.W., Wilson, G.L., Wolf, R.N., Zuber, K., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear Physics - Experiment, Physics::Atomic Physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Structure
Abstract

International audience; Hyperfine-structure parameters and isotope shifts for the 795-nm atomic transitions in $^{217,218,219}$At have been measured at CERN-ISOLDE, using the in-source resonance-ionization spectroscopy technique. Magnetic dipole and electric quadrupole moments, and changes in the nuclear mean-square charge radii, have been deduced. A large inverse odd-even staggering in radii, which may be associated with the presence of octupole collectivity, has been observed. Namely, the radius of the odd-odd isotope $^{218}$At has been found to be larger than the average of its even-$N$ neighbors, $^{217,219}$At. The discrepancy between the additivity-rule prediction and experimental data for the magnetic moment of $^{218}$At also supports the possible presence of octupole collectivity in the considered nuclei.

Published
2019

18. Inverse odd-even staggering in nuclear charge radii and possible octupole collectivity in $^{217 , 218 , 219}$At revealed by in-source laser spectroscopy

Author

Barzakh, A. E., Cubiss, J. G., Andreyev, A. N., Seliverstov, M. D., Andel, B., Antalic, S., Ascher, P., Atanasov, D., Beck, D., Bieroń, J., Blaum, K., Borgmann, Ch., Breitenfeldt, M., Capponi, L., Cocolios, T. E., Day Goodacre, T., Derkx, X., De Witte, H., Elseviers, J., Fedorov, D. V., Fedosseev, V. N., Fritzsche, S., Gaffney, L. P., George, S., Ghys, L., Hessberger, Fritz-Peter, Huyse, M., Imai, N., Kalaninová, Z., Kisler, D., Köster, U., Kowalska, M., Kreim, S., Lane, J. F. W., Liberati, V., Lunney, D., Lynch, K. M., Manea, V., Marsh, B. A., Mitsuoka, S., Molkanov, P. L., Nagame, Y., Neidherr, D., Nishio, K., Ota, S., Pauwels, D., Popescu, L., Radulov, D., Rapisarda, E., Revill, J. P., Rosenbusch, M., Rossel, R. E., Rothe, S., Sandhu, K., Schweikhard, L., Sels, S., Truesdale, V. L., Van Beveren, C., Van Den Bergh, P., Van Duppen, P., Wakabayashi, Y., Wendt, K. D. A., Wienholtz, F., Whitmore, B. W., Wilson, G. L., Wolf, R. N., and Zuber, K.

Subjects
ddc:530
Abstract

Physical review / C covering nuclear physics 99(5), 054317 (2019). doi:10.1103/PhysRevC.99.054317, Published by Inst., Woodbury, NY

Published
2019

19. Coulomb excitation of re-accelerated 208Rn and 206Po beams

Author

Grahn T., Albers M., Auranen K., Bauer C., Bernards C., Blazhev A., Butler P., Bönig S., Damyanova A., De Coster T., De Witte H., Elseviers J., Gaffney L. P., Huyse M., Herzáň A., Jakobsson U., Kesteloot N., Konki J., Kröll Th., Lewandowski L., Mosher K., Pakarinen J., Peura P., Pfeiffer M., Radeck D., Rahkila P., Rapisarda E., Reiter P., Reynders K., Rudiger M., Salsac M.-D., Sambi S., Scheck M., Siebeck B., Seidlitz M., Steinbach T., Stolze S., Thoele P., Thürauf M., Warr N., Van Duppen P., Venhart M., Vermeulen M. J., Werner V., Veselsky M., Vogt A., Wenander F., Wrzosek-Lipska K., and Zielinska M.

Subjects
Physics, QC1-999
Abstract

In the present study, B(E2; 2+ → 0+) values have been measured in the 208Rn and 206Po nuclei through Coulomb excitation of re-accelerated radioactive beams in inverse kinematics at CERN-ISOLDE. The resulting B(E2; 2+ → 0+) in 208Rn is ∼ 0.08 e2b2. These nuclei lie in, or at the boundary of the region where seniority scheme should persist. However, contributions from collective excitations may be present when moving away from the N = 126 shell closure. To date, surprisingly little is known of the transition probabilities between the low-spin states in this region.

Published
2013
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20. Microscopic structure of coexisting 0+ states in Ni68 probed via two-neutron transfer

Author

Flavigny, F., Elseviers, J., Andreyev, A. N., Bauer, C., Bildstein, V., Blazhev, A., Brown, B. A., De Witte, H., Diriken, J., Fedosseev, V. N., Franchoo, S., Gernhäuser, R., Huyse, M., Ilieva, S., Klupp, S., Kröll, Th., Lutter, R., Marsh, B. A., Mücher, D., Nowak, K., Otsuka, T., Pakarinen, J., Patronis, N., Raabe, R., Recchia, F., Reiter, P., Roger, T., Sambi, S., Seidlitz, M., Seliverstov, M. D., Siebeck, B., Tsunoda, Y., Van Duppen, P., Vermeulen, M., Von Schmid, M., Voulot, D., Warr, N., Wenander, F., and Wimmer, K.

Subjects
ddc
Published
2018

21. Charge radii and electromagnetic moments of $^{195--211}\mathrm{At}$

Author

Cubiss, JG, Barzakh, AE, Seliverstov, MD, Andreyev, AN, Andel, B, Antalic, S, Ascher, P, Atanasov, D, Beck, D, Bieroń, J, Blaum, K, Borgmann, C, Breitenfeldt, M, Capponi, L, Cocolios, TE, Day Goodacre, T, Derkx, X, De Witte, H, Elseviers, J, Fedorov, DV, Fedosseev, VN, Fritzsche, S, Gaffney, LP, George, S, Ghys, L, Heßberger, FP, Huyse, M, Imai, N, Kalaninová, Z, Kisler, D, Köster, U, Kowalska, M, Kreim, S, Lane, JFW, Liberati, V, Lunney, D, Lynch, KM, Manea, V, Marsh, BA, Mitsuoka, S, Molkanov, PL, Nagame, Y, Neidherr, D, Nishio, K, Ota, S, Pauwels, D, Popescu, L, Radulov, D, Rapisarda, E, Revill, JP, Rosenbusch, M, Rossel, RE, Rothe, S, Sandhu, K, Schweikhard, L, Sels, S, Truesdale, VL, Van Beveren, C, Van den Bergh, P, Wakabayashi, Y, Van Duppen, P, Wendt, KDA, Wienholtz, F, Whitmore, BW, Wilson, GL, Wolf, RN, and Zuber, K

Subjects
Nuclear Experiment
Abstract

© 2018 authors. Hyperfine-structure parameters and isotope shifts of At195-211 have been measured for the first time at CERN-ISOLDE, using the in-source resonance-ionization spectroscopy method. The hyperfine structures of isotopes were recorded using a triad of experimental techniques for monitoring the photo-ion current. The Multi-Reflection Time-of-Flight Mass Spectrometer, in connection with a high-resolution electron multiplier, was used as an ion-counting setup for isotopes that either were affected by strong isobaric contamination or possessed a long half-life; the ISOLDE Faraday cups were used for cases with high-intensity beams; and the Windmill decay station was used for short-lived, predominantly α-decaying nuclei. The electromagnetic moments and changes in the mean-square charge radii of the astatine nuclei have been extracted from the measured hyperfine-structure constants and isotope shifts. This was only made possible by dedicated state-of-the-art large-scale atomic computations of the electronic factors and the specific mass shift of atomic transitions in astatine that are needed for these extractions. By comparison with systematics, it was possible to assess the reliability of the results of these calculations and their ascribed uncertainties. A strong deviation in the ground-state mean-square charge radii of the lightest astatine isotopes, from the trend of the (spherical) lead isotopes, is interpreted as the result of an onset of deformation. This behavior bears a resemblance to the deviation observed in the isotonic polonium isotopes. Cases for shape coexistence have been identified in At197,199, for which a significant difference in the charge radii for ground (9/2-) and isomeric (1/2+) states has been observed. ispartof: Physical Review C vol:97 issue:5 status: Published online

Published
2018

22. Charge radii and electromagnetic moments of $^{195 – 211}$At

Author

Cubiss, J. G., Barzakh, A. E., Seliverstov, M. D., Andreyev, A. N., Andel, B., Antalic, S., Ascher, P., Atanasov, D., Beck, D., Bieroń, J., Blaum, K., Borgmann, Ch., Breitenfeldt, M., Capponi, L, Cocolios, T. E., Day Goodacre, T., Derkx, X., De Witte, H., Elseviers, J., Fedorov, D. V., Fedosseev, V N, Fritzsche, S., Gaffney, L. P., George, S., Ghys, L., Heßberger, F. P., Huyse, M., Imai, N., Kalaninová, Z., Kisler, D., Köster, U., Kowalska, M., Kreim, S., Lane, J. F. W., Liberati, V., Lunney, D., Lynch, K. M., Manea, V., Marsh, B. A., Mitsuoka, S., Molkanov, P. L., Nagame, Y., Neidherr, D., Nishio, K., Ota, S., Pauwels, D., Popescu, L., Radulov, D., Rapisarda, E., Revill, J. P., Rosenbusch, M., Rossel, R.E., Rothe, S., Sandhu, K., Schweikhard, L., Sels, S., Truesdale, V. L., Van Beveren, C., Van den Bergh, P., Wakabayashi, Y., Van Duppen, P., Wendt, K.D.A., Wienholtz, F., Whitmore, B. W., Wilson, G. L., Wolf, R.N., Zuber, K, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Laue-Langevin (ILL), ILL, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
ddc:530, Physics::Atomic Physics, Präzisionsexperimente - Abteilung Blaum, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Physical review / C 97(5), 054327 (2018). doi:10.1103/PhysRevC.97.054327, Published by Inst., Woodbury, NY

Published
2018

23. Single-neutron orbits near 78Ni: Spectroscopy of the N=49 isotope 79Zn

Author

Orlandi, R., Mücher, D., Raabe, R., Jungclaus, A., Pain, S.D., Bildstein, V., Chapman, R., de Angelis, G., Johansen, J.G., Van Duppen, P., Andreyev, A.N., Bottoni, S., Cocolios, T.E., De Witte, H., Diriken, J., Elseviers, J., Flavigny, F., Gaffney, L.P., Gernhäuser, R., Gottardo, A., Huyse, M., Illana, A., Konki, J., Kröll, T., Krücken, R., Lane, J.F.W., Liberati, V., Marsh, B., Nowak, K., Nowacki, F., Pakarinen, J., Rapisarda, E., Recchia, F., Reiter, P., Roger, T., Sahin, E., Seidlitz, M., Sieja, K., Smith, J.F., Valiente Dobón, J.J., von Schmid, M., Voulot, D., Warr, N., Wenander, F.K., and Wimmer, K.

Subjects
Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Physics::Atomic Physics, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment
Published
2015
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24. Detailed alpha-decay study of Tl-180

Author

Andel, B, Andreyev, AN, Antalic, S, Barzakh, A, Bree, N, Cocolios, TE, Comas, VF, Diriken, J, Elseviers, J, Fedorov, DV, Fedosseev, VN, Franchoo, S, Ghys, L, Heredia, JA, Huyse, M, Ivanov, O, Koster, U, Liberati, V, Marsh, BA, Nishio, K, Page, RD, Patronis, N, Seliverstov, MD, Tsekhanovich, I, Van den Bergh, P, De Walle, J Van, Van Duppen, P, Venhart, M, Vermote, S, Veselsky, M, and Wagemans, C

Published
2017

25. Study of bound states in Be-10 by one neutron removal reactions of Be-11

Author

Johansen, Jacob G., Bildstein, V., Borge, M. J. G., Cubero, M., Diriken, J., Elseviers, J., Fraile, L. M., Fynbo, H. O. U., Gaffney, L. P., Gernhaeuser, R., Jonson, B., Koldste, G. T., Konki, J., Kroell, T., Kruecken, R., Muecher, D., Nilsson, T., Nowak, K., Pakarinen, J., Pesudo, V., Raabe, R., Riisager, K., Seidlitz, M., Tengblad, O., Toernqvist, H., Voulot, D., Warr, N., Wimmer, K., De Witte, H., and Helsinki Institute of Physics

Subjects
PHYSICS, EXOTIC NUCLEI, REX-ISOLDE, differential cross section, RADIOACTIVE BEAMS, transfer reactions, gamma spectroscopy, Physics::Accelerator Physics, SCATTERING, CHANNELS CALCULATIONS, Nuclear Experiment, 114 Physical sciences, Be-10
Abstract

The bound states of Be-10 have been studied by removing single neutrons from Be-11 nuclei. A 2.8 MeV u(-1) beam of Be-11 was produced at ISOLDE, CERN and directed on to both proton and deuteron targets inducing one-neutron removal reactions. Charged particles were detected to identify the two reaction channels (d, t) and (p, d), and the individual states in Be-10 were identified by gamma detection. All bound states but one were populated and identified in the (d, t) reaction. The combination of REX-ISOLDE and MINIBALL allowed for a clean separation of the high-lying states in Be-10. This is the first time these states have been separated in a reaction experiment. Differential cross sections have been calculated for all the reaction channels and compared to DWBA calculations. Spectroscopic factors are derived and compared to values from the litterature. While the overall agreement between the spectrocopic factors is poor, the ratio between the ground state and the first excited state is in agreement with the previous measured ones. Furthermore, a significant population of the 2(2)(+) state is observed, which which may indicate the presence of multi-step processes at our beam energy.

Published
2017

26. Detailed $\alpha$-decay study of $^{180}\mathrm{Tl}$

Author

Andel, B., Andreyev, A.N., Antalic, S., Barzakh, A., Bree, N., Cocolios, T.E., Comas, V.F., Diriken, J., Elseviers, J., Fedorov, D.V., Fedosseev, V.N., Franchoo, S., Ghys, L., Heredia, J.A., Huyse, M., Ivanov, O., Köster, U., Liberati, V., Marsh, B.A., Nishio, K., Page, R.D., Patronis, N., Seliverstov, M.D., Tsekhanovich, I., Van Den Bergh, P., Van De Walle, J., Van Duppen, P., Venhart, M., Vermote, S., Veselský, M., Wagemans, C., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut Laue-Langevin (ILL), ILL, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
High Energy Physics::Experiment, Nuclear Physics - Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; A detailed $\alpha$-decay spectroscopy study of $^{180}\mathrm{Tl}$ has been performed at ISOLDE (CERN). $Z$-selective ionization by the Resonance Ionization Laser Ion Source (RILIS) coupled to mass separation provided a high-purity beam of $^{180}\mathrm{Tl}$. Fine-structure $\alpha$ decays to excited levels in the daughter $^{176}\mathrm{Au}$ were identified and an $\alpha$-decay scheme of $^{180}\mathrm{Tl}$ was constructed based on an analysis of $\alpha$-$\gamma$ and $\alpha$-$\gamma$-$\gamma$ coincidences. Multipolarities of several $\gamma$-ray transitions deexciting levels in $^{176}\mathrm{Au}$ were determined. Based on the analysis of reduced $\alpha$-decay widths, it was found that all $\alpha$ decays are hindered, which signifies a change of configuration between the parent and all daughter states.

Published
2017

27. Detailed α-decay study of 180Tl

Author

Andel, B., Andreyev, A. N., Antalic, S., Barzakh, A., Bree, N., Cocolios, T. E., Comas, V. F., Diriken, J., Elseviers, J., Fedorov, D. V., Fedosseev, V N, Franchoo, S., Ghys, L., Heredia, J. A., Huyse, M., Ivanov, O., Köster, U., Liberati, V., Marsh, B. A., Nishio, K., Page, R D, Patronis, N., Seliverstov, M. D., Tsekhanovich, I. S., Van den Bergh, P., Van de Walle, J., Van Duppen, P., Venhart, M., Vermote, S., Veselsky, M., and Wagemans, C.

Subjects
THALLIUM ISOTOPES, Physics and Astronomy, TL NUCLEI, ODD BI ISOTOPES, High Energy Physics::Experiment, Nuclear Experiment, NEUTRON-DEFICIENT, INTRUDER STATES
Abstract

A detailed α-decay spectroscopy study of 180Tl has been performed at ISOLDE (CERN). Z-selective ionization by the Resonance Ionization Laser Ion Source (RILIS) coupled to mass separation provided a high-purity beam of 180Tl. Fine-structure α decays to excited levels in the daughter 176Au were identified and an α-decay scheme of 180Tl was constructed based on an analysis of α−γ and α−γ−γ coincidences. Multipolarities of several γ-ray transitions deexciting levels in 176Au were determined. Based on the analysis of reduced α-decay widths, it was found that all α decays are hindered, which signifies a change of configuration between the parent and all daughter states. ispartof: Physical Review C vol:96 issue:5 status: published

Published
2017

28. Study of the deformation-driving νd5/2 orbital in 6728Ni39 using one-neutron transfer reactions

Author

Diriken, J., Patronis, N., Andreyev, A.N., Antalic, S., Bildstein, V., Blazhev, A., Darby, I.G., De Witte, H., Eberth, J., Elseviers, J., Fedosseev, V.N., Flavigny, F., Fransen, Ch., Georgiev, G., Gernhauser, R., Hess, H., Huyse, M., Jolie, J., Kröll, Th., Krücken, R., Lutter, R., Marsh, B.A., Mertzimekis, T., Muecher, D., Nowacki, F., Orlandi, R., Pakou, A., Raabe, R., Randisi, G., Reiter, P., Roger, T., Seidlitz, M., Seliverstov, M., Sieja, K., Sotty, C., Tornqvist, H., Van De Walle, J., Van Duppen, P., Voulot, D., Warr, N., Wenander, F., and Wimmer, K.

Subjects
Nuclear and High Energy Physics
Published
2014
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30. Evolution of single-particle strength in neutron-rich 71Cu

Author

Morfouace, P., Franchoo, S., Sieja, K., Matea, I., Nalpas, L., Niikura, M., Sánchez-Benítez, A.M., Stefan, I., Assié, M., Azaiez, F., Beaumel, D., Boissinot, S., Borcea, C., Borcea, R., Burgunder, G., Cáceres, L., De Séréville, N., Dombrádi, Zs., Elseviers, J., Fernández-Domínguez, B., Gillibert, A., Giron, S., Grévy, S., Hammache, F., Kamalou, O., Lapoux, V., Lefebvre, L., Lepailleur, A., Louchart, C., Marquinez-Duran, G., Martel, I., Matta, A., Mengoni, D., Napoli, D.R., Recchia, F., Scarpaci, J.-A., Sohler, D., Sorlin, O., Stanoiu, M., Stodel, C., Thomas, J.-C., and Vajta, Zs.

Published
2015
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31. Collective 2(1)(+) excitations in Po-206 and Rn-208,Rn-210

Author

Grahn, T, Pakarinen, J, Jokiniemi, L, Albers, M, Auranen, K, Bauer, C, Bernards, C, Blazhev, A, Butler, PA, Boenig, S, Damyanova, A, De Coster, T, De Witte, H, Elseviers, J, Gaffney, LP, Huyse, M, Herzan, A, Jakobsson, U, Julin, R, Kesteloot, N, Konki, J, Kroell, Th, Lewandowski, L, Moschner, K, Peura, P, Pfeiffer, M, Radeck, D, Rahkila, P, Rapisarda, E, Reiter, P, Reynders, K, Rudiger, M, Salsac, M-D, Sambi, S, Scheck, M, Seidlitz, M, Siebeck, B, Steinbach, T, Stolze, S, Suhonen, J, Thoele, P, Thuerauf, M, Warr, N, Van Duppen, P, Venhart, M, Vermeulen, MJ, Werner, V, Veselsky, M, Vogt, A, Wrzosek-Lipska, K, and Zielinska, M

Subjects
Nuclear Theory, Physics::Accelerator Physics, Nuclear Experiment
Abstract

In the present study, values have been measured in the 208,210Rn and 206Po nuclei through Coulomb excitation of re-accelerated radioactive beams in inverse kinematics at CERN-ISOLDE. These nuclei have been proposed to lie in, or at the boundary of the region where the seniority scheme should persist. However, contributions from collective excitations are likely to be present when moving away from the N=126 closed shell. Such an effect is confirmed by the observed increased collectivity of the transitions. Experimental results have been interpreted with the aid of theoretical studies carried out within the BCS-based QRPA framework. ispartof: European Physical Journal A, Hadrons and Nuclei vol:52 issue:11 status: published

Published
2016

32. β -delayed fission and α decay of at 196

Author

Truesdale, V. L., Andreyev, A. N., Ghys, L., Huyse, M., Van Duppen, P., Sels, S., Andel, B., Antalic, S., Barzakh, A., Capponi, L., Cocolios, T. E., Derkx, X., De Witte, H., Elseviers, J., Fedorov, D. V., Fedosseev, V. N., Heßberger, F. P., Kalaninová, Z., Köster, U., Lane, J. F W, Liberati, V., Lynch, K. M., Marsh, B. A., Mitsuoka, S., Nagame, Y., Nishio, K., Ota, S., Pauwels, D., Popescu, L., Radulov, D., Rapisarda, E., Rothe, S., Sandhu, K., Seliverstov, M. D., Sjödin, A. M., Van Beveren, C., Van Den Bergh, P., and Wakabayashi, Y.

Subjects
Nuclear Experiment
Abstract

A nuclear-decay spectroscopy study of the neutron-deficient isotope At196 is reported where an isotopically pure beam was produced using the selective Resonance Ionization Laser Ion Source and On-Line Isotope Mass Separator (CERN). The fine-structure α decay of At196 allowed the low-energy excited states in the daughter nucleus Bi192 to be investigated. A β-delayed fission study of At196 was also performed. A mixture of symmetric and asymmetric fission-fragment mass distributions of the daughter isotope Po196 (populated by β decay of At196) was deduced based on the measured fission-fragment energies. A βDF probability PβDF(At196)=9(1)×10-5 was determined.

Published
2016

33. β-delayed fission and α decay of At196

Author

Truesdale, V. L., Andreyev, A. N., Ghys, L., Huyse, M., Van Duppen, P., Sels, S., Andel, B., Antalic, S., Barzakh, A., Capponi, L., Cocolios, T. E., Derkx, X., De Witte, H., Elseviers, J., Fedorov, D. V., Fedosseev, V. N., Heßberger, F. P., Kalaninová, Z., Köster, U., Lane, J. F. W., Liberati, V., Lynch, K. M., Marsh, B. A., Mitsuoka, S., Nagame, Y., Nishio, K., Ota, S., Pauwels, D., Popescu, L., Radulov, D., Rapisarda, E., Rothe, S., Sandhu, K., Seliverstov, M. D., Sjödin, A. M., Van Beveren, C., Van den Bergh, P., and Wakabayashi, Y.

Published
2016

34. Spectroscopy of Ar-46 by the (t, p) two-neutron transfer reaction

Author

Nowak, K, Wimmer, K, Hellgartner, S, Muecher, D, Bildstein, V, Diriken, Jan, Elseviers, J, Gaffney, LP, Gernhaeuser, R, Iwanicki, J, Johansen, JG, Huyse, Mark, Konki, J, Kroell, T, Kruecken, R, Lutter, R, Orlandi, R, Pakarinen, J, Raabe, Riccardo, Reiter, P, Roger, T, Schrieder, G, Seidlitz, M, Sorlin, O, Van Duppen, Piet, Warr, N, Zielinska, M, De Witte, Hilde, and Helsinki Institute of Physics

Subjects
Physics::Accelerator Physics, Nuclear Experiment, 114 Physical sciences
Abstract

© 2016 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. States in the N=28 nucleus Ar46 have been studied by a two-neutron transfer reaction at REX-ISOLDE (CERN). A beam of radioactive Ar44 at an energy of 2.16 AMeV and a tritium-loaded titanium target were used to populate Ar46 by the H3(Ar44,p) two-neutron transfer reaction. Protons emitted from the target were identified in the T-REX silicon detector array. The excitation energies of states in Ar46 have been reconstructed from the measured angles and energies of recoil protons. Angular distributions for three final states were measured and based on the shape of the differential cross section an excited state at 3695 keV was identified as Jπ=0+. The angular differential cross section for the population of different states are compared to calculations using a reaction model employing both sequential and direct transfer of two neutrons. Results are compared to shell-model calculations using state-of-the-art effective interactions. 10 pages, 12 figures, PRC accepted ispartof: Physical Review C vol:93 issue:4 status: published

Published
2016

35. Spectroscopy of $^{46}$Ar by the (t,p) two-neutron transfer reaction

Author

Nowak, K., Wimmer, K., Hellgartner, S., Mücher, D., Bildstein, V., Diriken, J., Elseviers, J., Gaffney, L. P., Gernhäuser, R., Iwanicki, J., Johansen, J. G., Huyse, M., Konki, Joonas, Kröll, T., Krücken, R., Lutter, R., Orlandi, R., Pakarinen, Janne, Raabe, R., Reiter, P., Roger, T., Schrieder, G., Seidlitz, M., Sorlin, O., Van Duppen, P., Warr, N., De Witte, H., Zielińska, M., Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear Theory (nucl-th), nuclear spectroscopy, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], argon, FOS: Physical sciences, Physics::Accelerator Physics, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, two-neutron transfer reaction
Abstract

States in the $N=28$ nucleus $^{46}$Ar have been studied by a two-neutron transfer reaction at REX-ISOLDE (CERN). A beam of radioactive $^{44}$ at an energy of 2.16~AMeV and a tritium loaded titanium target were used to populate $^{46}$ by the t($^{44}$,p) two-neutron transfer reaction. Protons emitted from the target were identified in the T-REX silicon detector array. The excitation energies of states in $^{46}$ have been reconstructed from the measured angles and energies of recoil protons. Angular distributions for three final states were measured and based on the shape of the differential cross section an excited state at 3695~keV has been identified as $J^\pi = 0^+$. The angular differential cross section for the population of different states are compared to calculations using a reaction model employing both sequential and direct transfer of two neutrons. Results are compared to shell model calculations using state-of-the-art effective interactions., Comment: 10 pages, 12 figures, PRC accepted

Published
2016

36. beta-delayed fission and alpha decay of At-196

Author

Truesdale, VL, Andreyev, AN, Ghys, Lars, Huyse, Mark, Van Duppen, Piet, Sels, Simon, Andel, B, Antalic, S, Barzakh, A, Capponi, L, Cocolios, Thomas Elias, Derkx, X, De Witte, Hilde, Elseviers, J, Fedorov, DV, Fedosseev, VN, Hessberger, FP, Kalaninova, Z, Koster, U, Lane, JFW, Liberati, V, Lynch, KM, Marsh, BA, Mitsuoka, S, Nagame, Y, Nishio, K, Ota, S, Pauwels, D, Popescu, L, Radulov, D, Rapisarda, E, Rothe, S, Sandhu, K, Seliverstov, MD, Sjodin, AM, Van Beveren, Céline, Van Den Bergh, Piet, and Wakabayashi, Y

Subjects
Nuclear Experiment
Abstract

A nuclear-decay spectroscopy study of the neutron-deficient isotope 196At is reported where an isotopically pure beam was produced using the selective Resonance Ionization Laser Ion Source and On-Line Isotope Mass Separator (CERN). The fine-structure α decay of 196At allowed the low-energy excited states in the daughter nucleus 192Bi to be investigated. A β-delayed fission study of 196At was also performed. A mixture of symmetric and asymmetric fission-fragment mass distributions of the daughter isotope 196Po (populated by β decay of 196At) was deduced based on the measured fission-fragment energies. A βDF probability PβDF(196At) = 9(1) × 10−5 was determined. ispartof: Physical Review C vol:94 issue:3 status: published

Published
2016

37. Shape coexistence studied in ${}^{\mathrm{182,184}}$Hg via theβdecay of ${}^{\mathrm{182,184}}$Tl

Author

Rapisarda, E, primary, Andreyev, A N, additional, Antalic, S, additional, Barzakh, A, additional, Cocolios, T E, additional, Darby, I G, additional, Groote, R De, additional, Witte, H De, additional, Diriken, J, additional, Elseviers, J, additional, Fedorov, D, additional, Fedosseev, V N, additional, Ferrer, R, additional, Huyse, M, additional, Kalaninová, Z, additional, Köster, U, additional, Lane, J, additional, Liberati, V, additional, Lynch, K M, additional, Marsh, B A, additional, Molkanov, P L, additional, Pauwels, D, additional, Procter, T J, additional, Radulov, D, additional, Sandhu, K, additional, Seliverstov, M D, additional, Beveren, C Van, additional, Bergh, P Van den, additional, Duppen, P Van, additional, Venhart, M, additional, Veselský, M, additional, and Wrzosek-Lipska, K, additional

Published
2017
Full Text
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38. Study of bound states in10Be by one neutron removal reactions of11Be

Author

Johansen, Jacob G, primary, Bildstein, V, additional, Borge, M J G, additional, Cubero, M, additional, Diriken, J, additional, Elseviers, J, additional, Fraile, L M, additional, Fynbo, H O U, additional, Gaffney, L P, additional, Gernhäuser, R, additional, Jonson, B, additional, Koldste, G T, additional, Konki, J, additional, Kröll, T, additional, Krücken, R, additional, Mücher, D, additional, Nilsson, T, additional, Nowak, K, additional, Pakarinen, J, additional, Pesudo, V, additional, Raabe, R, additional, Riisager, K, additional, Seidlitz, M, additional, Tengblad, O, additional, Törnqvist, H, additional, Voulot, D, additional, Warr, N, additional, Wimmer, K, additional, and Witte, H De, additional

Published
2017
Full Text
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39. Study of the deformation-driving nu d(5/2) orbital in Ni-67(28)39 using one-neutron transfer reactions

Author

Diriken, J., Patronis, N., Andreyev, A.N., Antalic, S., Bildstein, V., Blazhev, A., Darby, I.G., De Witte, H., Eberth, J., Elseviers, J., Fedosseev, V.N., Flavigny, F., Fransen, C., Georgiev, G., Gernhauser, R., Hess, H., Huyse, M., Jolie, J., Kroll, T., Krucken, R., Lutter, R., Marsh, B.A., Mertzimekis, T., Muecher, D., Nowacki, F., Orlandi, R., Pakou, A., Raabe, R., Randisi, G., Reiter, P., Roger, T., Seidlitz, M., Seliverstov, M., Sieja, K., Sotty, C., Tornqvist, H., Van De Walle, J., Van Duppen, P., Voulot, D., Warr, N., Wenander, F., Wimmer, K., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

40. Erratum to 'Study of the deformation-driving νd5/2νd5/2 orbital in 6728Ni39 using one-neutron transfer reactions

Author

Diriken, J., Patronis, N., Andreyev, A.N., Antalic, S., Bildstein, V., Blazhev, A., Darby, I.G., Witte, H. De, Eberth, J., Elseviers, J., Fedosseev, V.N., Flavigny, F., Fransen, Ch., Georgiev, G., Gernhauser, R., Hess, H., Huyse, M., Jolie, J., Kröll, Th., Krücken, R., Lutter, R., Marsh, B.A., Mertzimekis, T., Muecher, D., Nowacki, F., Orlandi, R., Pakou, A., Raabe, R., Randisi, G., Reiter, P., Roger, T., Seidlitz, M., Seliverstov, M., Sieja, K., Sotty, C., Tornqvist, H., Walle, J. Van De, Duppen, P. Van, Voulot, D., Warr, N., Wenander, F., Wimmer, K., CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire Départemental de Préhistoire du Lazaret (LDPL), and Département des Alpes-Maritimes

Subjects
[PHYS]Physics [physics], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

41. Erratum to 'Study of the deformation-driving D Orbital in Ni using one-neutron transfer reactions' [Phys. Lett. B 736 (2014) 533–538]

Author

Diriken, J., Patronis, N., Andreyev, A.N., Antalic, S., Bildstein, V., Blazhev, A., Darby, I.G., De Witte, H., Eberth, J., Elseviers, J., Fedosseev, V.N., Flavigny, F., Fransen, Ch., Georgiev, G., Gernhauser, R., Hess, H., Huyse, M., Jolie, J., Kröll, Th., Krücken, R., Lutter, R., Marsh, B.A., Mertzimekis, T., Muecher, D., Nowacki, F., Orlandi, R., Pakou, A., Raabe, R., Randisi, G., Reiter, P., Roger, T., Seidlitz, M., Seliverstov, M., Sieja, K., Sotty, C., Tornqvist, H., Van De Walle, J., Van Duppen, P., Voulot, D., Warr, N., Wenander, F., and Wimmer, K.

Published
2015

42. Testing refined shell-model interactions in the sd shell: Coulomb excitation of 26Na

Author

Siebeck, B., Seidlitz, M., Blazhev, A., Reiter, P., Altenkirch, R., Bauer, C., Butler, P. A., De Witte, H., Elseviers, J., Gaffney, L. P., Hess, H., Huyse, M., Kröll, T., Lutter, R., Pakarinen, Janne, Pietralla, N., Radeck, F., Scheck, M., Schneiders, D., Sotty, C., Van Duppen, P., Vermeulen, M., Voulot, D., Warr, N., and Wenander, F.

Subjects
shell-model calculations, nuclei, refined shell-model interactions
Abstract

Background: Shell-model calculations crucially depend on the residual interaction used to approximate the nucleon-nucleon interaction. Recent improvements to the empirical universal sd interaction (USD) describing nuclei within the sd shell yielded two new interactions—USDA and USDB—causing changes in the theoretical description of these nuclei. Purpose: Transitionmatrix elements between excited states provide an excellent probe to examine the underlying shell structure. These observables provide a stringent test for the newly derived interactions. The nucleus 26Na with 7 valence neutrons and 3 valence protons outside the doubly-magic 16O core is used as a test case. Method: A radioactive beam experiment with 26Na (T1/2 = 1,07s) was performed at the REX-ISOLDE facility (CERN) using Coulomb excitation at safe energies below the Coulomb barrier. Scattered particles were detected with an annular Si detector in coincidence with γ rays observed by the segmented MINIBALL array. Coulomb excitation cross sections of the beam have been obtained by normalization to the well known Coulomb excitation cross sections of the 104Pd target. Results: The observation of three γ -ray transitions in 26Na together with available spectroscopic data allows us to determine E2- and M1-transitional matrix elements. Results are compared to theoretical predictions. Conclusion: The improved theoretical description of 26Na could be validated. Remaining discrepancies between experimental data and theoretical predictions indicate the need for future experiments and possibly further theoretical improvements. ispartof: Physical Review C vol:91 issue:1 status: published

Published
2015

43. Testing refined shell-model interactions in the sd shell: Coulomb excitation of Na26

Author

Siebeck, B, Seidlitz, M, Blazhev, A, Reiter, P, Altenkirch, R, Bauer, C, Butler, P A, De Witte, H, Elseviers, J, Gaffney, L P, Hess, H, Huyse, M, Kröll, T, Lutter, R, Pakarinen, J, Pietralla, N, Radeck, F, Scheck, M, Schneiders, D, Sotty, C, Van Duppen, P, Vermeulen, M, Voulot, D, Warr, N, and Wenander, F

Subjects
Nuclear Physics - Experiment
Abstract

Background: Shell-model calculations crucially depend on the residual interaction used to approximate the nucleon-nucleon interaction. Recent improvements to the empirical universal sd interaction (USD) describing nuclei within the sd shell yielded two new interactions—USDA and USDB—causing changes in the theoretical description of these nuclei. Purpose: Transition matrix elements between excited states provide an excellent probe to examine the underlying shell structure. These observables provide a stringent test for the newly derived interactions. The nucleus Na26 with 7 valence neutrons and 3 valence protons outside the doubly-magic 16O core is used as a test case. Method: A radioactive beam experiment with Na26 (T1/2=1,07s) was performed at the REX-ISOLDE facility (CERN) using Coulomb excitation at safe energies below the Coulomb barrier. Scattered particles were detected with an annular Si detector in coincidence with γ rays observed by the segmented MINIBALL array. Coulomb excitation cross sections of the beam have been obtained by normalization to the well known Coulomb excitation cross sections of the Pd104 target. Results: The observation of three γ-ray transitions in Na26 together with available spectroscopic data allows us to determine E2- and M1-transitional matrix elements. Results are compared to theoretical predictions. Conclusion: The improved theoretical description of Na26 could be validated. Remaining discrepancies between experimental data and theoretical predictions indicate the need for future experiments and possibly further theoretical improvements.

Published
2015

44. Single-neutron orbits near Ni-78: Spectroscopy of the N=49 isotope Zn-79

Author

Orlandi, R., Mücher, D., Raabe, R., Jungclaus, A., Pain, S.D., Bildstein, V., Chapman, R., Angelis, G. de, Johansen, J.G., Van Duppen, P., Andreyev, A.N., Bottoni, S., Cocolios, T.E., De Witte, H., Diriken, J., Elseviers, J., Flavigny, F., Gaffney, L.P., Gernhäuser, R., Gottardo, A., Huyse, M., Illana, A., Konki, Joonas, Kröll, T., Krücken, R., Lane, J.F.W., Liberati, V., Marsh, B., Nowak, K., Nowacki, F., Pakarinen, Janne, Rapisarda, E., Recchia, F., Reiter, P., Roger, T., Sahin, E., Seidlitz, M., Sieja, K., Smith, J.F., Dobón, J.J. Valiente, von Schmid, M., Voulot, D., Warr, N., Wenander, F.K., Wimmer, K., European Commission, Ministerio de Ciencia e Innovación (España), Fonds Wetenschappelijk Onderzoek, Belgian Science Policy Office, Federal Ministry of Education and Research (Germany), Science and Technology Facilities Council (UK), Helsinki Institute of Physics, and Research Foundation - Flanders

Subjects
NUCLEI, RICH ISOTOPES, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, education, gamma-Ray transitions, N = 50 shell closure, Y-Ray transitions, 114 Physical sciences, ELASTIC-SCATTERING, Transfer reactions, Nuclear structure, Nuclear Experiment, N=50 shell closure
Abstract

5 pags., 6 figs., Single-neutron states in the , isotope 79Zn have been populated using the 78Zn(d, p)79Zn transfer reaction at REX-ISOLDE, CERN. The experimental setup allowed the combined detection of protons ejected in the reaction, and of γ rays emitted by 79Zn. The analysis reveals that the lowest excited states populated in the reaction lie at approximately 1 MeV of excitation, and involve neutron orbits above the shell gap. From the analysis of γ-ray data and of proton angular distributions, characteristic of the amount of angular momentum transferred, a configuration was assigned to a state at 983 keV. Comparison with large-scale-shell-model calculations supports a robust neutron shell-closure for 78Ni. These data constitute an important step towards the understanding of the magicity of 78Ni and of the structure of nuclei in the region., This work was supported by the European Commission through the Marie Curie Actions Contracts Nos. PIEFGA-2011-30096 (R.O.) and PIEFGA-2008-219175 (J.P.), by the Spanish Ministerio de Ciencia e Innovación under contracts FPA2009-13377-C02 and FPA2011-29854-C04, by the Spanish MEC Consolider – Ingenio 2010, Project No. CDS2007-00042 (CPAN), by FWO-Vlaanderen (Belgium), by GOA/2010/010 (BOF KU Leuven), by the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office (BriX network P7/12), by the European Union Seventh Framework Programme through ENSAR, contract no. RII3-CT-2010-262010, and by the German BMBF under contracts 05P09PKCI5, 05P12PKFNE, 05P12RDCIA and 06DA9036I. R.O., R.C., J.F.W.L., V.L. and J.F.S. also acknowledge support from STFC, Grant Nos. PP/F000944/1, ST/F007590/1, and ST/J000183/2.

Published
2015

45. Spectroscopy of Ar-46 by the (t, p) two-neutron transfer reaction

Author

University of Helsinki, Helsinki Institute of Physics, Nowak, K., Wimmer, K., Hellgartner, S., Muecher, D., Bildstein, V., Diriken, J., Elseviers, J., Gaffney, L. P., Gernhaeuser, R., Iwanicki, J., Johansen, J. G., Huyse, M., Konki, J., Kroell, T., Kruecken, R., Lutter, R., Orlandi, R., Pakarinen, J., Raabe, R., Reiter, P., Roger, T., Schrieder, G., Seidlitz, M., Sorlin, O., Van Duppen, P., Warr, N., De Witte, H., Zielinska, M., University of Helsinki, Helsinki Institute of Physics, Nowak, K., Wimmer, K., Hellgartner, S., Muecher, D., Bildstein, V., Diriken, J., Elseviers, J., Gaffney, L. P., Gernhaeuser, R., Iwanicki, J., Johansen, J. G., Huyse, M., Konki, J., Kroell, T., Kruecken, R., Lutter, R., Orlandi, R., Pakarinen, J., Raabe, R., Reiter, P., Roger, T., Schrieder, G., Seidlitz, M., Sorlin, O., Van Duppen, P., Warr, N., De Witte, H., and Zielinska, M.

Abstract

States in the N = 28 nucleus Ar-46 have been studied by a two-neutron transfer reaction at REX-ISOLDE (CERN). A beam of radioactive Ar-44 at an energy of 2.16 AMeV and a tritium-loaded titanium target were used to populate Ar-46 by the H-3(Ar-44, p) two-neutron transfer reaction. Protons emitted from the target were identified in the T-REX silicon detector array. The excitation energies of states in Ar-46 have been reconstructed from the measured angles and energies of recoil protons. Angular distributions for three final states were measured and based on the shape of the differential cross section an excited state at 3695 keV was identified as J(pi) = 0(+). The angular differential cross section for the population of different states are compared to calculations using a reaction model employing both sequential and direct transfer of two neutrons. Results are compared to shell-model calculations using state-of-the-art effective interactions.

Published
2016

46. Spectroscopy of Ar-46 by the (t, p) two-neutron transfer reaction

Author

Nowak, K., Wimmer, K., Hellgartner, S., Muecher, D., Bildstein, V., Diriken, J., Elseviers, J., Gaffney, L. P., Gernhaeuser, R., Iwanicki, J., Johansen, J. G., Huyse, M., Konki, J., Kroell, T., Kruecken, R., Lutter, R., Orlandi, R., Pakarinen, J., Raabe, R., Reiter, P., Roger, T., Schrieder, G., Seidlitz, M., Sorlin, O., Van Duppen, P., Warr, N., De Witte, H., Zielinska, M., Nowak, K., Wimmer, K., Hellgartner, S., Muecher, D., Bildstein, V., Diriken, J., Elseviers, J., Gaffney, L. P., Gernhaeuser, R., Iwanicki, J., Johansen, J. G., Huyse, M., Konki, J., Kroell, T., Kruecken, R., Lutter, R., Orlandi, R., Pakarinen, J., Raabe, R., Reiter, P., Roger, T., Schrieder, G., Seidlitz, M., Sorlin, O., Van Duppen, P., Warr, N., De Witte, H., and Zielinska, M.

Abstract

States in the N = 28 nucleus Ar-46 have been studied by a two-neutron transfer reaction at REX-ISOLDE (CERN). A beam of radioactive Ar-44 at an energy of 2.16 AMeV and a tritium-loaded titanium target were used to populate Ar-46 by the H-3(Ar-44, p) two-neutron transfer reaction. Protons emitted from the target were identified in the T-REX silicon detector array. The excitation energies of states in Ar-46 have been reconstructed from the measured angles and energies of recoil protons. Angular distributions for three final states were measured and based on the shape of the differential cross section an excited state at 3695 keV was identified as J(pi) = 0(+). The angular differential cross section for the population of different states are compared to calculations using a reaction model employing both sequential and direct transfer of two neutrons. Results are compared to shell-model calculations using state-of-the-art effective interactions.

Published
2016

47. Collective 2(1)(+) excitations in Po-206 and Rn-208,Rn-210

Author

Grahn, T., Pakarinen, J., Jokiniemi, L., Albers, M., Auranen, K., Bauer, C., Bernards, C., Blazhev, A., Butler, P. A., Boenig, S., Damyanova, A., De Coster, T., De Witte, H., Elseviers, J., Gaffney, L. P., Huyse, M., Herzan, A., Jakobsson, U., Julin, R., Kesteloot, N., Konki, J., Kroell, Th., Lewandowski, L., Moschner, K., Peura, P., Pfeiffer, M., Radeck, D., Rahkila, P., Rapisarda, E., Reiter, P., Reynders, K., Rudiger, M., Salsac, M. -D., Sambi, S., Scheck, M., Seidlitz, M., Siebeck, B., Steinbach, T., Stolze, S., Suhonen, J., Thoele, P., Thuerauf, M., Warr, N., Van Duppen, P., Venhart, M., Vermeulen, M. J., Werner, V., Veselsky, M., Vogt, A., Wrzosek-Lipska, K., Zielinska, M., Grahn, T., Pakarinen, J., Jokiniemi, L., Albers, M., Auranen, K., Bauer, C., Bernards, C., Blazhev, A., Butler, P. A., Boenig, S., Damyanova, A., De Coster, T., De Witte, H., Elseviers, J., Gaffney, L. P., Huyse, M., Herzan, A., Jakobsson, U., Julin, R., Kesteloot, N., Konki, J., Kroell, Th., Lewandowski, L., Moschner, K., Peura, P., Pfeiffer, M., Radeck, D., Rahkila, P., Rapisarda, E., Reiter, P., Reynders, K., Rudiger, M., Salsac, M. -D., Sambi, S., Scheck, M., Seidlitz, M., Siebeck, B., Steinbach, T., Stolze, S., Suhonen, J., Thoele, P., Thuerauf, M., Warr, N., Van Duppen, P., Venhart, M., Vermeulen, M. J., Werner, V., Veselsky, M., Vogt, A., Wrzosek-Lipska, K., and Zielinska, M.

Abstract

In the present study, B(E2; 2(1)(+) -> 0(1)(+)) values have been measured in the Rn-208,Rn-210 and Po-206 nuclei through Coulomb excitation of re-accelerated radioactive beams in inverse kinematics at CERNISOLDE. These nuclei have been proposed to lie in, or at the boundary of the region where the seniority scheme should persist. However, contributions from collective excitations are likely to be present when moving away from the N = 126 closed shell. Such an effect is confirmed by the observed increased collectivity of the 2(1)(+) -> 0(1)(+) transitions. Experimental results have been interpreted with the aid of theoretical studies carried out within the BCS-based QRPA framework.

Published
2016

48. Alpha decay of 176Au

Author

Andreyev, A. N., Antalic, S., Ackermann, D., Cocolios, T. E., Elseviers, J., Franchoo, S., Heinz, S., Heßberger, F. P., Hofmann, S., Huyse, M., Khuyagbaatar, J., Kindler, B., Lommel, B., Mann, R., Page, R. D., Van Duppen, P., and Venhart, M.

Published
2014

49. Study of the deformation-driving vd5/2 orbital in 6728Ni39 using one-neutron transfer reactions

Author

Diriken, J., Patronis, N., Andreyev, A.N., Antalic, S., Bildstein, V., Blazhev, A., Darby, I.G., De Witte, H., Eberth, J., Elseviers, J., Fedosseev, V.N., Flavigny, F., Fransen, Ch., Georgiev, G., Gernhauser, R., Hess, H., Huyse, M., Jolie, J., Kröll, Th., Krücken, R., Lutter, R., Marsh, B.A., Mertzimekis, T., Muecher, D., Nowacki, F., Orlandi, R., Pakou, A., Raabe, R., Randisi, G., Reiter, P., Roger, T., Seidlitz, M., Seliverstov, M., Sieja, K., Sotty, C., Tornqvist, H., Van De Walle, J., Van Duppen, P., Voulot, D., Warr, N., Wenander, F., and Wimmer, K.

Abstract

The ν g 9 / 2 , d 5 / 2 , s 1 / 2 orbitals are assumed to be responsible for the swift onset of collectivity observed in the region below 68Ni. Especially the single-particle energies and strengths of these orbitals are of importance. We studied such properties in the nearby 67Ni nucleus, by performing a ( d , p ) -experiment in inverse kinematics employing a post-accelerated radioactive ion beam (RIB) at the REX-ISOLDE facility. The experiment was performed at an energy of 2.95 MeV/u using a combination of the T-REX particle detectors, the Miniball γ-detection array and a newly-developed delayed-correlation technique as to investigate μs-isomers. Angular distributions of the ground state and multiple excited states in 67Ni were obtained and compared with DWBA cross-section calculations, leading to the identification of positive-parity states with substantial ν g 9 / 2 (1007 keV) and ν d 5 / 2 (2207 keV and 3277 keV) single-particle strengths up to an excitation energy of 5.8 MeV. 50% of the ν d 5 / 2 single-particle strength relative to the ν g 9 / 2 -orbital is concentrated in and shared between the first two observed 5 / 2 + levels. A comparison with extended Shell Model calculations and equivalent (3He, d) studies in the region around 9040Zr50 highlights similarities for the strength of the negative-parity pf and positive-parity g 9 / 2 state, but differences are observed for the d 5 / 2 single-particle strength.

Published
2014

50. Study of the deformation-driving νd5/2 orbital in 67 28 Ni 39 using one-neutron transfer reactions

Author

Diriken, J., Patronis, N., Andreyev, A.N., Antalic, S., Bildstein, V., Blazhev, A., Darby, I.G., De Witte, H., Eberth, J., Elseviers, J., Fedosseev, V.N., Flavigny, F., Fransen, Ch., Georgiev, G., Gernhauser, R., Hess, H., Huyse, M., Jolie, J., Kröll, Th., Krücken, R., Lutter, R., Marsh, B.A., Mertzimekis, T., Muecher, D., Nowacki, F., Orlandi, R., Pakou, A., Raabe, R., Randisi, G., Reiter, P., Roger, T., Seidlitz, M., Seliverstov, M., Sieja, K., Sotty, C., Tornqvist, H., Van De Walle, J., Van Duppen, P., Voulot, D., Warr, N., Wenander, F., and Wimmer, K.

Abstract

The νg9/2,d5/2,s1/2 orbitals are assumed to be responsible for the swift onset of collectivity observed in the region below 68 Ni. Especially the single-particle energies and strengths of these orbitals are of importance. We studied such properties in the nearby 67 Ni nucleus, by performing a (d,p) -experiment in inverse kinematics employing a post-accelerated radioactive ion beam (RIB) at the REX-ISOLDE facility. The experiment was performed at an energy of 2.95 MeV/u using a combination of the T-REX particle detectors, the Miniball γ -detection array and a newly-developed delayed-correlation technique as to investigate μs-isomers. Angular distributions of the ground state and multiple excited states in 67 Ni were obtained and compared with DWBA cross-section calculations, leading to the identification of positive-parity states with substantial νg9/2 (1007 keV) and νd5/2 (2207 keV and 3277 keV) single-particle strengths up to an excitation energy of 5.8 MeV. 50% of the νd5/2 single-particle strength relative to the νg9/2 -orbital is concentrated in and shared between the first two observed 5/2+ levels. A comparison with extended Shell Model calculations and equivalent ( 3 He, d ) studies in the region around 90 40 Zr 50 highlights similarities for the strength of the negative-parity pf and positive-parity g9/2 state, but differences are observed for the d5/2 single-particle strength.

Published
2014

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