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175 results on '"Litzinger J"'

1. Search for mixed-symmetry states of nuclei in the vicinity of the double-magic nucleus 208Pb

Author

Kocheva D., Stegmann R., Rainovski G., Jolie J., Pietralla N., Stahl C., Petkov P., Blazhev A., Hennig A., Bauer C., Braunroth Th., Carpenter M.P., Cortes L., Dewald A., Djongolov M., Fransen C., Gladnishki K., Janssens R.V.F., Karayonchev V., Lettmann M., Lister C.J., Litzinger J., Möller Th., Möller-Gatermann C., Scheck M., Scholz Ph., Schramm C., Thöle P., Werner V., Wölk D., Zhu S., and Van Isacker P.

Subjects
Physics, QC1-999
Abstract

In this work we present the results from two experiments dedicated to search for quadrupolecollective isovector valence-shell excitation, the states with so-called mixed proton-neutron symmetry (MSS), in nuclei around the doubly magic nucleus 208Pb. 212Po was studied in an α-transfer reaction. 204Hg was studied in an inverse kinematics Coulomb excitation reaction on a carbon target. Both experiments provide indications for existence of one-phonon MSSs. Those are the first experimentally identified MSSs in the mass A ≈ 208 region.

Published
2016
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2. Tests of collectivity in $^{98}$Zr by absolute transition rates

Author

Karayonchev, V., Jolie, J., Blazhev, A., Dewald, A., Esmaylzadeh, A., Fransen, C., Häfner, G., Knafla, L., Litzinger, J., Müller-Gatermann, C., Régis, J. -M., Schomacker, K., Vogt, A., Warr, N., Leviatan, A., and Gavrielov, N.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Lifetimes of low-spin excited states in $^{98}$Zr were measured using the recoil-distance Doppler-shift technique and the Doppler-shift attenuation method. The nucleus of interest was populated in a $^{96}$Zr($^{18}$O,$^{16}$O)$^{98}$Zr two-neutron transfer reaction at the Cologne FN Tandem accelerator. Lifetimes of six low-spin excited states, of which four are unknown, were measured. The deduced $B(E2)$ values were compared with Monte Carlo shell model and interacting boson model with configuration mixing calculations. Both approaches reproduce well most of the data but leave challenging questions regarding the structure of some low lying states., Comment: 13 pages, 12 figures, 3 tables, accepted for publication in Physical Review C

Published
2021
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3. Lifetime measurements on fission fragments in the A ∼ 100 region

Author

Grente L., Salsac M.-D., Korten W., Görgen A., Hagen T. W., Braunroth T., Bruyneel B., Celikovic I., Clément E., Delaune O., Dijon A., Drouart A., Ertürk S., Farget F., de France G., Gottardo A., Hackstein M., Jacquot B., Libert J., Litzinger J., Ljungvall J., Louchart C., Michelagnoli C., Napoli D.R., Navin A., Pillet N., Pipidis A., Recchia F., Rejmund M., Rother W., Sahin E., Schmitt C., Siem S., Sulignano B., Valiente-Dobon J.J., and Zell K.O.

Subjects
Physics, QC1-999
Abstract

Lifetimes of first 4+ and 6+ states have been measured in neutron-rich isotopes of Zr, Mo, Ru and Pd using the recoil distance Doppler shift method at GANIL. The nuclei were produced through a fusion-fission reaction in inverse kinematics. The fission fragments were fully identified in the large-acceptance VAMOS spectrometer and γ-rays were detected in coincidence with the EXOGAM germanium array. Lifetimes of excited states in the range of 1–100 ps were measured with the Cologne plunger. Preliminary lifetime results are presented as well as a discussion on the evolution of the collectivity in this region.

Published
2013
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4. Evidence for coexisting shapes in $^{98}$Zr through lifetime measurements

Author

Singh, Purnima, Korten, W., Hagen, T. W., Görgen, A., Grente, L., Salsac, M. -D., Farget, F., Clément, E., de France, G., Braunroth, T., Bruyneel, B., Celikovic, I., Delaune, O., Dewald, A., Dijon, A., Delaroche, J. -P., Girod, M., Hackstein, M., Jacquot, B., Libert, J., Litzinger, J., Ljungvall, J., Louchart, C., Gottardo, A., Michelagnoli, C., Müller-Gatermann, C., Napoli, D. R., Otsuka, T., Pillet, N., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Togashi, T., Tsunoda, Y., Theisen, Ch., and Valiente-Dobon, J. J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The lifetimes of first excited 2$^+$, 4$^+$ and 6$^+$ states in $^{98}$Zr were measured with the Recoil-Distance Doppler Shift method in an experiment performed at GANIL. Excited states in $^{98}$Zr were populated using the fission reaction between a 6.2 MeV/u $^{238}$U beam and a $^{9}$Be target. The $\gamma$ rays were detected with the EXOGAM array in correlation with the fission fragments identified in mass and atomic number in the VAMOS++ spectrometer. Our result shows very small B(E2;2$_1^+$ $\rightarrow$ 0$_1^+$) value in $^{98}$Zr thereby confirming the very sudden onset of collectivity at $N=60$. The experimental results are compared to large-scale Monte Carlo Shell model and beyond mean field calculations. The present results indicate coexistence of two additional deformed shapes in this nucleus along with the spherical ground state.

Published
2019
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5. A revised $B(E2; 2^+_1 \to 0^+_1)$ value in the semi-magic nucleus $^{210}$Po

Author

Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Astier, A., Braunroth, Th., Cortés, M. L., Dewald, A., Djongolov, M., Fransen, C., Gladnishki, K., Hennig, A., Karayonchev, V., Keatings, J. M., Litzinger, J., Müller-Gatermann, C., Petkov, P., Scheck, M., Spagnoletti, P., Scholz, Ph., Stahl, C., Stegmann, R., Stoyanova, M., Thöle, P., Warr, N., Werner, V., Witt, W., Wölk, D., Zell, K. O., Van Isacker, P., and Ponomarev, V. Yu.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The lifetimes of the $2^+_1$, the $2^+_2$ and the $3^-_1$ states of $^{210}$Po have been measured in the $^{208}$Pb($^{12}$C,$^{10}$Be)$^{210}$Po transfer reaction by the Doppler-shift attenuation method. The results for the lifetime of the $2^+_1$ state is about three times shorter than the adopted value. However, the new value still does not allow for consistent description of the properties of the yrast $2^+_1$, $4^+_1$, $6^+_1$, and $8^+_1$ states of $^{210}$Po in the framework of nuclear shell models. The Quasi-particle Phonon Model (QPM) calculations also cannot overcome this problem thus indicating the existence of a peculiarity which is neglected in both theoretical approaches.

Published
2017
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6. Low collectivity of the first 2⁺ states of ²¹²,²¹⁰Po

Author

Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Astier, A., Altenkirch, R., Bast, M., Beckers, M., Ansari, S., Braunroth, Th., Cappellazzo, M., Cortés, M.L., Dewald, A., Diel, F., Djongolov, M., Fransen, C., Gladnishki, K., Goldkuhle, A., Hennig, A., Karayonchev, V., Keatings, J.M., Kluge, E., Kröll, Th., Litzinger, J., Moschner, K., Müller-Gatermann, C., Petkov, P., Rudigier, M., Scheck, M., Spagnoletti, P., Scholz, Ph., Schmidt, T., Spieker, M., Stahl, C., Stegmann, R., Stolz, A., Vogt, A., Stoyanova, M., Thöle, P., Warr, N., Werner, V., Witt, W., Wölk, D., Zamora, J.C., Zell, K.O., Van Isacker, P., Ponomarev, V. Yu., Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Astier, A., Altenkirch, R., Bast, M., Beckers, M., Ansari, S., Braunroth, Th., Cappellazzo, M., Cortés, M.L., Dewald, A., Diel, F., Djongolov, M., Fransen, C., Gladnishki, K., Goldkuhle, A., Hennig, A., Karayonchev, V., Keatings, J.M., Kluge, E., Kröll, Th., Litzinger, J., Moschner, K., Müller-Gatermann, C., Petkov, P., Rudigier, M., Scheck, M., Spagnoletti, P., Scholz, Ph., Schmidt, T., Spieker, M., Stahl, C., Stegmann, R., Stolz, A., Vogt, A., Stoyanova, M., Thöle, P., Warr, N., Werner, V., Witt, W., Wölk, D., Zamora, J.C., Zell, K.O., Van Isacker, P., and Ponomarev, V. Yu.

Abstract

The lifetimes of the first 2⁺ excited states of ²¹²,²¹⁰Po were measured in two transfer reactions ²⁰⁸Pb(¹²C,⁸Be)²¹²Po and ²⁰⁸Pb(¹²C,¹⁰Be)²¹⁰Po by the Recoil Distance Doppler Shift (RDDS) method and by the Doppler Shift Attenuation method (DSAM), respectively. The derived absolute B(E2) values of 2.6(3) W.u. for ²¹²Po and 1.83(28) W.u. for ²¹⁰Po indicate low collectivity. It is shown that the properties of the yrast 2₁⁺, 4₁⁺, 6₁⁺ and 8₁⁺ states in both nuclei cannot be described consistently in the framework of nuclear shell models. It is also demonstrated in the case of ²¹⁰Po that Quasi-particle Phonon Model (QPM) calculations cannot overcome this problem thus indicating the existence of a peculiarity which is neglected in both theoretical approaches.

Published
2024

7. A new dedicated plunger device for the GALILEO [formula omitted]-ray detector array

Author

Müller-Gatermann, C., von Spee, F., Goasduff, A., Bazzacco, D., Beckers, M., Braunroth, T., Boso, A., Cocconi, P., de Angelis, G., Dewald, A., Fransen, C., Goldkuhle, A., Gottardo, A., Gozzelino, A., Hadyńska-Klęk, K., Jawroski, G., John, P.R., Jolie, J., Lenzi, S.M., Litzinger, J., Menegazzo, R., Mengoni, D., Napoli, D.R., Recchia, F., Siciliano, M., Testov, D., Thiel, S., Valiente-Dobón, J.J., and Zell, K.O.

Published
2019
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8. Lifetime measurement of excited states in 46Ti

Author

Goldkuhle, A., Fransen, C., Dewald, A., Arnswald, K., Bast, M., Beckers, M., Blazhev, A., Braunroth, T., Hackenberg, G., Häfner, G., Litzinger, J., Jolie, J., Müller-Gatermann, C., von Spee, F., Warr, N., Werner, D., and Zell, K. O.

Published
2019
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9. Lifetimes of excited states in triaxially deformed 107Tc and 109,111,113Rh

Author

Hagen, T. W., Görgen, A., Korten, W., Grente, L., Salsac, M. -D., Farget, F., Braunroth, T., Bruyneel, B., Celikovic, I., Clément, E., de France, G., Delaune, O., Dewald, A., Dijon, A., Hackstein, M., Jacquot, B., Litzinger, J., Ljungvall, J., Louchart, C., Michelagnoli, C., Napoli, D. R., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Theisen, Ch., and Valiente-Dobon, J. J.

Published
2018
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10. Lifetime measurements of excited states in neutron-rich $^{53}$Ti : Benchmarking effective shell-model interactions

Author

Goldkuhle, A., Blazhev, A., Fransen, C., Dewald, A., Beckers, M., Birkenbach, B., Braunroth, T., Clément, E., Dudouet, J., Eberth, J., Hess, H., Jacquot, B., Jolie, J., Kim, Y.-H., Lemasson, A., Lenzi, S., Li, H., Litzinger, J., Michelagnoli, C., Müller-Gatermann, C., Nara Singh, B., Pérez-Vidal, R., Ralet, D., Reiter, P., Vogt, A., Warr, N., Zell, K., 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 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 de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-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)-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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)

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

International audience; Level lifetimes of the yrast (5/2 −) to 13/2 − states in the neutron-rich nucleus 53 Ti, produced in a multinucleon-transfer reaction, have been measured for the first time. The recoil distance Doppler-shift method was employed and lifetimes of the excited states were extracted by a lineshape analysis aided by Geant4-based Monte-Carlo simulations. The experiment was performed at the Grand Accélérateur National d'Ions Lourds facility in Caen, France, by using the Advanced Gamma Tracking Array for the γ-ray detection coupled to the large-acceptance variable mode spectrometer for an event-by-event particle identification and the Cologne plunger for deep-inelastic reactions. Reduced transition probabilities, deduced from the lifetimes, give new information on the nuclear structure of 53 Ti, and are used to benchmark different shell-model calculations using established interactions in the fp shell.

Published
2020
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11. Tests of collectivity in Zr98 by absolute transition rates

Author

Karayonchev, V., primary, Jolie, J., additional, Blazhev, A., additional, Dewald, A., additional, Esmaylzadeh, A., additional, Fransen, C., additional, Häfner, G., additional, Knafla, L., additional, Litzinger, J., additional, Müller-Gatermann, C., additional, Régis, J.-M., additional, Schomacker, K., additional, Vogt, A., additional, Warr, N., additional, Leviatan, A., additional, and Gavrielov, N., additional

Published
2020
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12. Lifetime measurements of excited states in neutron-rich Ti53 : Benchmarking effective shell-model interactions

Author

Goldkuhle, A., primary, Blazhev, A., additional, Fransen, C., additional, Dewald, A., additional, Beckers, M., additional, Birkenbach, B., additional, Braunroth, T., additional, Clément, E., additional, Dudouet, J., additional, Eberth, J., additional, Hess, H., additional, Jacquot, B., additional, Jolie, J., additional, Kim, Y.-H., additional, Lemasson, A., additional, Lenzi, S. M., additional, Li, H. J., additional, Litzinger, J., additional, Michelagnoli, C., additional, Müller-Gatermann, C., additional, Nara Singh, B. S., additional, Pérez-Vidal, R. M., additional, Ralet, D., additional, Reiter, P., additional, Vogt, A., additional, Warr, N., additional, and Zell, K. O., additional

Published
2020
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14. Lifetime measurements of excited states in neutron-rich Ti 53: Benchmarking effective shell-model interactions

Author

Goldkuhle, A., Blazhev, A., Fransen, C., Dewald, A., Beckers, M., Birkenbach, B., Braunroth, T., Cl+¬ment, E., Dudouet, J., Eberth, J., Hess, H., Jacquot, B., Jolie, J., Kim, Y. -H., Lemasson, A., Lenzi, S. M., H. J., Li, Litzinger, J., Michelagnoli, C., M++ller-Gatermann, C., Nara Singh, B. S., P+¬rez-Vidal, R. M., Ralet, D., Reiter, P., Vogt, A., Warr, N., and Zell, K. O.

Published
2020

15. Lifetime measurements in Ti-52,Ti-54 to study shell evolution toward N=32

Author

Goldkuhle, A, Fransen, C, Blazhev, A, Beckers, M, Birkenbach, B, Braunroth, T, Clement, E, Dewald, A, Dudouet, J, Eberth, J, Hess, H, Jacquot, B, Jolie, J, Kim, Y-H, Lemasson, A, Lenzi, SM, Li, HJ, Litzinger, J, Michelagnoli, C, Mueller-Gatermann, C, Singh, BS Nara, Perez-Vidal, RM, Ralet, D, Reiter, P, Vogt, A, Warr, N, Zell, KO, Atac, A, Barrientos, D, Barthe-Dejean, C, Benzoni, G, Boston, AJ, Boston, HC, Bourgault, P, Burrows, I, Cacitti, J, Cederwall, B, Ciemala, M, Cullen, DM, De France, G, Domingo-Pardo, C, Foucher, J-L, Fremont, G, Gadea, A, Gangnant, P, Gonzalez, V, Goupil, J, Henrich, C, Houarner, C, Jean, M, Judson, DS, Korichi, A, Korten, W, Labiche, M, Lefevre, A, Legeard, L, Legruel, F, Leoni, S, Ljungvall, J, Maj, A, Maugeais, C, Menager, L, Menard, N, Menegazzo, R, Mengoni, D, Million, B, Munoz, H, Napoli, DR, Navin, A, Nyberg, J, Ozille, M, Podolyak, Zs, Pullia, A, Raine, B, Recchia, F, Ropert, J, Saillant, F, Salsac, MD, Sanchis, E, Schmitt, C, Simpson, J, Spitaels, C, Stezowski, O, Theisen, Ch, Toulemonde, M, Tripon, M, Dobon, J-J Valiente, Voltolini, G, Zielinska, M, and Collaboration, AGATA

Published
2019

16. Lifetime measurements in Ti 52,54 to study shell evolution toward N=32

Author

Goldkuhle, A., Fransen, C., Blazhev, A., Beckers, M., Birkenbach, B., Braunroth, T., Clément, E., Dewald, A., Dudouet, J., Eberth, J., Hess, H., Jacquot, B., Jolie, J., Kim, Y.H., Lemasson, A., Lenzi, Silvia M., Li, H.J., Litzinger, J., Michelagnoli, C., Müller-Gatermann, C., Nara Singh, B.S., Pérez-Vidal, R.M., Ralet, D., Reiter, P., Vogt, A., Warr, N., Zell, K.O., Ataç, A., Barrientos, D., Barthe-Dejean, C., Benzoni, G., Boston, A.J., Boston, H.C., Bourgault, P., Burrows, I., Cacitti, J., Cederwall, B., Ciemala, M., Cullen, D.M., De France, G., Domingo Pardo, César, Foucher, J.L., Fremont, G., Gadea, Andrés, Gangnant, P., González, V., Goupil, J., Henrich, C., Houarner, C., Sanchis, E., Ministerio de Economía y Competitividad (España), and Ministerio de Ciencia, Innovación y Universidades (España)

Subjects
Nuclear Experiment
Abstract

AGATA Collaboration, Lifetimes of the excited states in the neutron-rich Ti52,54 nuclei, produced in a multinucleon-transfer reaction, were measured by employing the Cologne plunger device and the recoil-distance Doppler-shift method. The experiment was performed at the Grand Accélérateur National d'Ions Lourds facility by using the Advanced Gamma Tracking Array for the γ-ray detection, coupled to the large-acceptance variable mode spectrometer for an event-by-event particle identification. A comparison between the transition probabilities obtained from the measured lifetimes of the 21+ to 81+ yrast states in Ti52,54 and that from the shell-model calculations based on the well-established GXPF1A, GXPF1B, and KB3G fp shell interactions support the N=32 subshell closure. The B(E2) values for Ti52 determined in this work are in disagreement with the known data, but are consistent with the predictions of the shell-model calculations and reduce the previously observed pronounced staggering across the even-even titanium isotopes.

Published
2019

17. Lifetime measurement of excited states in Ce-144: Enhanced E1 strengths in a candidate for octupole deformation

Author

Beckers, M., Mueller-Gatermann, C., Blazhev, A., Braunroth, T., Dewald, A., Fransen, C., Goldkuhle, A., Kornwebel, L., Litzinger, J., von Spee, F., Zell, K-O, Beckers, M., Mueller-Gatermann, C., Blazhev, A., Braunroth, T., Dewald, A., Fransen, C., Goldkuhle, A., Kornwebel, L., Litzinger, J., von Spee, F., and Zell, K-O

Abstract

A lifetime measurement of excited states in Ce-144 using the (142)ce(O-18, O-16) reaction with a beam energy of 67 MeV and the recoil distance Doppler-shift method was performed at the Cologne FN Tandem accelerator. Lifetimes of the three lowest yrast states in Ce-144 have been measured as well as for the 3(1)(-) state and an effective lifetime of the 4(2)(+) state. Reduced E2 transition strengths determined using these results have been compared to predictions from recent shell-model calculations. From the interband transitions reduced E1 strengths could be determined, which are strongly enhanced.

Published
2020

18. Tests of collectivity in Zr-98 by absolute transition rates

Author

Karayonchev, V, Jolie, J., Blazhev, A., Dewald, A., Esmaylzadeh, A., Fransen, C., Haefner, G., Knafla, L., Litzinger, J., Muller-Gatermann, C., Regis, J-M, Schomacker, K., Vogt, A., Warr, N., Leviatan, A., Gavrielov, N., Karayonchev, V, Jolie, J., Blazhev, A., Dewald, A., Esmaylzadeh, A., Fransen, C., Haefner, G., Knafla, L., Litzinger, J., Muller-Gatermann, C., Regis, J-M, Schomacker, K., Vogt, A., Warr, N., Leviatan, A., and Gavrielov, N.

Abstract

Lifetimes of low-spin excited states in Zr-98 were measured using the recoil-distance Doppler-shift technique , and the Doppler-shift attenuation method. The nucleus of interest was populated in a( 96)zr(O-18, O-16) Zr-98 two- neutron transfer reaction at the Cologne FN Tandem accelerator. Lifetimes of six low-spin excited states, of which four are unknown, were measured. The deduced B(E2) values were compared with Monte Carlo shell model and interacting boson model with configuration mixing calculations. Both approaches reproduce well most of the data but leave challenging questions regarding the structure of some low-lying states.

Published
2020

19. Lifetime measurements in Ti-52,Ti-54 to study shell evolution toward N=32

Author

Goldkuhle, A., Fransen, C., Blazhev, A., Beckers, M., Birkenbach, B., Braunroth, T., Clement, E., Dewald, A., Dudouet, J., Eberth, J., Hess, H., Jacquot, B., Jolie, J., Kim, Y-H, Lemasson, A., Lenzi, S. M., Li, H. J., Litzinger, J., Michelagnoli, C., Mueller-Gatermann, C., Singh, B. S. Nara, Perez-Vidal, R. M., Ralet, D., Reiter, P., Vogt, A., Warr, N., Zell, K. O., Atac, A., Barrientos, D., Barthe-Dejean, C., Benzoni, G., Boston, A. J., Boston, H. C., Bourgault, P., Burrows, I, Cacitti, J., Cederwall, B., Ciemala, M., Cullen, D. M., De France, G., Domingo-Pardo, C., Foucher, J-L, Fremont, G., Gadea, A., Gangnant, P., Gonzalez, V, Goupil, J., Henrich, C., Houarner, C., Jean, M., Judson, D. S., Korichi, A., Korten, W., Labiche, M., Lefevre, A., Legeard, L., Legruel, F., Leoni, S., Ljungvall, J., Maj, A., Maugeais, C., Menager, L., Menard, N., Menegazzo, R., Mengoni, D., Million, B., Munoz, H., Napoli, D. R., Navin, A., Nyberg, Johan, Ozille, M., Podolyak, Zs, Pullia, A., Raine, B., Recchia, F., Ropert, J., Saillant, F., Salsac, M. D., Sanchis, E., Schmitt, C., Simpson, J., Spitaels, C., Stezowski, O., Theisen, Ch, Toulemonde, M., Tripon, M., Dobon, J-J Valiente, Voltolini, G., and Zielinska, M.

Subjects
Subatomär fysik, Subatomic Physics, Nuclear Experiment
Abstract

Lifetimes of the excited states in the neutron-rich Ti-52,Ti-54 nuclei, produced in a multinucleon-transfer reaction, were measured by employing the Cologne plunger device and the recoil-distance Doppler-shift method. The experiment was performed at the Grand Accelerateur National d'Ions Lourds facility by using the Advanced Gamma Tracking Array for the gamma-ray detection, coupled to the large-acceptance variable mode spectrometer for an event-by-event particle identification. A comparison between the transition probabilities obtained from the measured lifetimes of the 2(1)(+) to 8(1)(+) yrast states in Ti-52,Ti-54 and that from the shell-model calculations based on the well-established GXPF1A, GXPF1B, and KB3G fp shell interactions support the N = 32 subshell closure. The B(E2) values for Ti-52 determined in this work are in disagreement with the known data, but are consistent with the predictions of the shell-model calculations and reduce the previously observed pronounced staggering across the even-even titanium isotopes.

Published
2019

20. Shape coexistence in $^{178}$Hg

Author

Müller-Gatermann, C., Dewald, A., Fransen, C., Auranen, K., Badran, H., Beckers, M., Blazhev, A., Braunroth, T., Cullen, D.M., Fruet, G., Goldkuhle, A., Grahn, T., Greenlees, P.T., Herzáň, A., Jakobsson, U., Jenkins, D., Jolie, J., Julin, R., Juutinen, S., Konki, J., Leino, M., Litzinger, J., Nomura, K., Pakarinen, J., Peura, P., Procter, M.G., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., Sorri, J., Stolze, S., Taylor, M.J., Uusitalo, J., Zell, K.O., Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
alpha decay, collective levels, collective models, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ydinfysiikka, Nuclear Experiment, Nuclear Structure
Abstract

Lifetime measurements of excited states in 178 Hg have been performed using the 103 Rh ( 78 Kr , p 2 n ) reaction at a beam energy of 354 MeV. The recoil-decay tagging (RDT) technique was applied to select the 178 Hg nuclei and associate the prompt γ rays with the correlated characteristic ground-state α decay. Lifetimes of the four lowest yrast states of 178 Hg have been determined using the recoil distance Doppler-shift (RDDS) method. The experimental data are compared to theoretical predictions with focus on shape coexistence. The results confirm the shift of the deformed prolate structures to higher lying states but also indicate their increasing deformation with decreasing neutron number. peerReviewed

Published
2019
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21. Evidence for Coexisting Shapes through Lifetime Measurements in $^{98}\mathrm{Zr}$

Author

Singh, P, Korten, W, Hagen, TW, Görgen, A, Grente, L, Salsac, M-D, Farget, F, Clément, E, de France, G, Braunroth, T, Bruyneel, B, Celikovic, I, Delaune, O, Dewald, A, Dijon, A, Delaroche, J-P, Girod, M, Hackstein, M, Jacquot, B, Libert, J, Litzinger, J, Ljungvall, J, Louchart, C, Gottardo, A, Michelagnoli, C, Müller-Gatermann, C, Napoli, DR, Otsuka, T, Pillet, N, Recchia, F, Rother, W, Sahin, E, Siem, S, Sulignano, B, Togashi, T, Tsunoda, Y, Theisen, C, and Valiente-Dobon, JJ

Abstract

The lifetimes of the first excited 2^{+}, 4^{+}, and 6^{+} states in ^{98}Zr were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in ^{98}Zr were populated using the fission reaction between a 6.2 MeV/u ^{238}U beam and a ^{9}Be target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small B(E2;2_{1}^{+}→0_{1}^{+}) value in ^{98}Zr, thereby confirming the very sudden onset of collectivity at N=60. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state. ispartof: PHYSICAL REVIEW LETTERS vol:121 issue:19 pages:192501-192501 ispartof: location:United States status: published

Published
2018

22. Shape coexistence in Hg178

Author

Müller-Gatermann, C., primary, Dewald, A., additional, Fransen, C., additional, Auranen, K., additional, Badran, H., additional, Beckers, M., additional, Blazhev, A., additional, Braunroth, T., additional, Cullen, D. M., additional, Fruet, G., additional, Goldkuhle, A., additional, Grahn, T., additional, Greenlees, P. T., additional, Herzáň, A., additional, Jakobsson, U., additional, Jenkins, D., additional, Jolie, J., additional, Julin, R., additional, Juutinen, S., additional, Konki, J., additional, Leino, M., additional, Litzinger, J., additional, Nomura, K., additional, Pakarinen, J., additional, Peura, P., additional, Procter, M. G., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scholey, C., additional, Sorri, J., additional, Stolze, S., additional, Taylor, M. J., additional, Uusitalo, J., additional, and Zell, K. O., additional

Published
2019
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23. A new dedicated plunger device for the GALILEO γ-ray detector array

Author

Müller-Gatermann, C., primary, von Spee, F., additional, Goasduff, A., additional, Bazzacco, D., additional, Beckers, M., additional, Braunroth, T., additional, Boso, A., additional, Cocconi, P., additional, de Angelis, G., additional, Dewald, A., additional, Fransen, C., additional, Goldkuhle, A., additional, Gottardo, A., additional, Gozzelino, A., additional, Hadyńska-Klęk, K., additional, Jawroski, G., additional, John, P.R., additional, Jolie, J., additional, Lenzi, S.M., additional, Litzinger, J., additional, Menegazzo, R., additional, Mengoni, D., additional, Napoli, D.R., additional, Recchia, F., additional, Siciliano, M., additional, Testov, D., additional, Thiel, S., additional, Valiente-Dobón, J.J., additional, and Zell, K.O., additional

Published
2019
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24. Shape coexistence in ¹⁷⁸Hg

Author

Mueller-Gatermann, C. (C.), Dewald, A. (A.), Fransen, C. (C.), Auranen, K. (K.), Badran, H. (H.), Beckers, M. (M.), Blazhev, A. (A.), Braunroth, T. (T.), Cullen, D. M. (D. M.), Fruet, G. (G.), Goldkuhle, A. (A.), Grahn, T. (T.), Greenlees, P. T. (P. T.), Herzan, A. (A.), Jakobsson, U. (U.), Jenkins, D. (D.), Jolie, J. (J.), Julin, R. (R.), Juutinen, S. (S.), Konki, J. (J.), Leino, M. (M.), Litzinger, J. (J.), Nomura, K. (K.), Pakarinen, J. (J.), Peura, P. (P.), Procter, M. G. (M. G.), Rahkila, P. (P.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Saren, J. (J.), Scholey, C. (C.), Sorri, J. (J.), Stolze, S. (S.), Taylor, M. J. (M. J.), Uusitalo, J. (J.), Zell, K. O. (K. O.), Mueller-Gatermann, C. (C.), Dewald, A. (A.), Fransen, C. (C.), Auranen, K. (K.), Badran, H. (H.), Beckers, M. (M.), Blazhev, A. (A.), Braunroth, T. (T.), Cullen, D. M. (D. M.), Fruet, G. (G.), Goldkuhle, A. (A.), Grahn, T. (T.), Greenlees, P. T. (P. T.), Herzan, A. (A.), Jakobsson, U. (U.), Jenkins, D. (D.), Jolie, J. (J.), Julin, R. (R.), Juutinen, S. (S.), Konki, J. (J.), Leino, M. (M.), Litzinger, J. (J.), Nomura, K. (K.), Pakarinen, J. (J.), Peura, P. (P.), Procter, M. G. (M. G.), Rahkila, P. (P.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Saren, J. (J.), Scholey, C. (C.), Sorri, J. (J.), Stolze, S. (S.), Taylor, M. J. (M. J.), Uusitalo, J. (J.), and Zell, K. O. (K. O.)

Abstract

Lifetime measurements of excited states in ¹⁷⁸Hg have been performed using the ¹⁰³Rh(⁷⁸Kr,p2n) reaction at a beam energy of 354 MeV. The recoil-decay tagging (RDT) technique was applied to select the ¹⁷⁸Hg nuclei and associate the prompt γ rays with the correlated characteristic ground-state α decay. Lifetimes of the four lowest yrast states of ¹⁷⁸Hg have been determined using the recoil distance Doppler-shift (RDDS) method. The experimental data are compared to theoretical predictions with focus on shape coexistence. The results confirm the shift of the deformed prolate structures to higher lying states but also indicate their increasing deformation with decreasing neutron number.

Published
2019

25. A new dedicated plunger device for the GALILEO gamma-ray detector array

Author

Mueller-Gatermann, C., von Spee, F., Goasduff, A., Bazzacco, D., Beckers, M., Braunroth, T., Boso, A., Cocconi, P., de Angelis, G., Dewald, A., Fransenn, C., Goldkuhle, A., Gottardo, A., Gozzelino, A., Hadynska-Klek, K., Jawroski, G., John, P. R., Jolie, J., Lenzi, S. M., Litzinger, J., Menegazzo, R., Mengoni, D., Napoli, D. R., Recchia, F., Sicilia, M., Testov, D., Thiel, S., Valiente-Dobon, J. J., Zell, K. O., Mueller-Gatermann, C., von Spee, F., Goasduff, A., Bazzacco, D., Beckers, M., Braunroth, T., Boso, A., Cocconi, P., de Angelis, G., Dewald, A., Fransenn, C., Goldkuhle, A., Gottardo, A., Gozzelino, A., Hadynska-Klek, K., Jawroski, G., John, P. R., Jolie, J., Lenzi, S. M., Litzinger, J., Menegazzo, R., Mengoni, D., Napoli, D. R., Recchia, F., Sicilia, M., Testov, D., Thiel, S., Valiente-Dobon, J. J., and Zell, K. O.

Abstract

A new device, the GALILEO plunger, has been developed for lifetime measurement studies using the GALILEO gamma-ray detector array at the Laboratori Nazionali di Legnaro (LNL) in Legnaro, Italy. This plunger device holds two stretched metal foils in the beam path for the use of the recoil distance Doppler-shift technique in order to measure lifetimes of nuclear excited states in the range of 1 ps to 1 ns. The compact design allows one to combine different auxiliary detectors with the plunger device inside the target chamber and takes care of high gamma-ray transparency. The design and control of the device are presented in this paper, together with lifetimes of excited states in Pt-180 measured within the first in-beam commissioning run.

Published
2019

26. Shape coexistence in Hg-178

Author

Mueller-Gatermann, C., Dewald, A., Fransen, C., Auranen, K., Badran, H., Beckers, M., Blazhev, A., Braunroth, T., Cullen, D. M., Fruet, G., Goldkuhle, A., Grahn, T., Greenlees, P. T., Herzan, A., Jakobsson, U., Jenkins, D., Jolie, J., Julin, R., Juutinen, S., Konki, J., Leino, M., Litzinger, J., Nomura, K., Pakarinen, J., Peura, P., Procter, M. G., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Taylor, M. J., Uusitalo, J., Zell, K. O., Mueller-Gatermann, C., Dewald, A., Fransen, C., Auranen, K., Badran, H., Beckers, M., Blazhev, A., Braunroth, T., Cullen, D. M., Fruet, G., Goldkuhle, A., Grahn, T., Greenlees, P. T., Herzan, A., Jakobsson, U., Jenkins, D., Jolie, J., Julin, R., Juutinen, S., Konki, J., Leino, M., Litzinger, J., Nomura, K., Pakarinen, J., Peura, P., Procter, M. G., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Taylor, M. J., Uusitalo, J., and Zell, K. O.

Abstract

Lifetime measurements of excited states in Hg-178 have been performed using the Rh-103(Kr-78, p2n) reaction at a beam energy of 354 MeV. The recoil-decay tagging (RDT) technique was applied to select the Hg-178 nuclei and associate the prompt gamma rays with the correlated characteristic ground-state alpha decay. Lifetimes of the four lowest yrast states of Hg-178 have been determined using the recoil distance Doppler-shift (RDDS) method. The experimental data are compared to theoretical predictions with focus on shape coexistence. The results confirm the shift of the deformed prolate structures to higher lying states but also indicate their increasing deformation with decreasing neutron number.

Published
2019

27. Lifetime measurement of excited states in Ti-46

Author

Goldkuhle, A., Fransen, C., Dewald, A., Arnswald, K., Bast, M., Beckers, M., Blazhev, A., Braunroth, T., Hackenberg, G., Haefner, G., Litzinger, J., Jolie, J., Mueller-Gatermann, C., von Spee, F., Warr, N., Werner, D., Zell, K. O., Goldkuhle, A., Fransen, C., Dewald, A., Arnswald, K., Bast, M., Beckers, M., Blazhev, A., Braunroth, T., Hackenberg, G., Haefner, G., Litzinger, J., Jolie, J., Mueller-Gatermann, C., von Spee, F., Warr, N., Werner, D., and Zell, K. O.

Abstract

The level lifetimes of the yrast 2(1)(+), 4(1)(+) and 6(1)(+) states and an upper limit of the lifetime of the 8(1)(+) state in Ti-46 have been measured with high accuracy exploiting the recoil distance Doppler-shift method (RDDS) and using coincidences. The nuclei were populated by the fusion evaporation reaction Ca-40(Be-9, 2p1n)Ti-46 at a beam energy of E=33 MeV at the FN tandem accelerator of the University of Cologne, Germany. Lifetimes were extracted using the established differential decay curve method (DDCM).

Published
2019

28. Transition probabilities in neutron-rich 80,82Se and the role of the {\nu}g9/2 orbital

Author

Litzinger, J, Blazhev, Andrey, Dewald, Alfred, Didierjean, Francois, Duchene, G, Fransen, C., Lozeva, R, Verney, D, De Angelis, G., Bazzacco, Dino, Birkenbach, B., Bottoni, S., Bracco, Angela, Braunroth, T, Cederwall, B., Corradi, Lorenzo, Crespi, F.C.L., Désesquelles, Pierre, Eberth, Jürgen, Ellinger, E., Farnea, Enrico, Fioretto, E., Gernhauser, Roman, Goasduff, A, Görgen, Andreas, Gottardo, Andrea, Grebosz, J, Hackstein, Matthias, Hess, Herbert, Ibrahim, Fadi, Jolie, J, Jungclaus, Andrea, Kolos, K, Korten, Wolfram, Leoni, Silvia, Lunardi, Santo, Maj, Adam, Menegazzo, R., Mengoni, Daniele, Michelagnoli, Caterina, Mijatovic, T., Million, Bénédicte, Möller, O, Modamio, Victor, Montagnoli, G., Montanari, D., Morales, Ana Isabel, Napoli, D.R., Niikura, Megumi, Pietralla, Norbert A., Pollarolo, G., Pullia, A., Quintana, B., Recchia, Francesco, Reiter, Peter, Rosso, D., Sahin, Eda, Salsac, Marie Delphine, Scarlassara, F., Söderström, Pär Anders, Stefanini, AM, Stezowski, Olivier, Szilner, Suzana, Theisen, Christophe, Valiente-Dobón, Jose Javier, Vandone, V, and Vogt, A.

Abstract

Transition probabilities of intermediate-spin yrast and non-yrast excitations in 80,82Se were investigated in a recoil distance Doppler-shift (RDDS) experiment performed at the Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro. The Cologne Plunger device for deep inelastic scattering was used for the RDDS technique and was combined with the AGATA Demonstrator array for the γ -ray detection and coupled to the PRISMA magnetic spectrometer for an event-by-event particle identification. In 80Se, the level lifetimes of the yrast (6+ 1 ) and (8+ 1 ) states and of a non-yrast band feeding the yrast 4+ 1 state are determined. A spin and parity assignment of the head of this sideband is discussed based on the experimental results and supported by large-scale shell-model calculations. In 82Se, the level lifetimes of the yrast 6+ 1 state and the yrare 4+ 2 state and lifetime limits of the yrast (10+ 1 ) state and of the 5− 1 state are determined. Although the experimental results contain large uncertainties, they are interpreted with care in terms of large-scale shell-model calculations using the effective interactions JUN45 and jj44b. The excited states’ wave functions are investigated and discussed with respect to the role of the neutron g9/2 orbital.

Published
2018

29. Evidence for Coexisting Shapes through Lifetime Measurements in Zr98

Author

Singh, Purnima, Korten, Wolfram, Hagen, T. W., Gorgen, Andreas, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Clement, Emmanuel, de France, Gilles, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Delaune, Olivier, Dewald, Alfred, Dijon, A., Delaroche, Jean Paul, Girod, Michel, Hackstein, Matthias, Jacquot, Bertrand, Libert, J., Litzinger, J., Ljungvall, Joa, Louchart, C., Gottardo, Andrea, Michelagnoli, Caterina, Muller-Gatermann, C, Napoli, Daniel R., Otsuka, Takaharu, Pillet, Nathalie, Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Togashi, Tomoaki, Tsunoda, Yuhsuke, Theisen, Christophe, and Valiente-Dobon, Jose Javier

Subjects
Nuclear Experiment
Abstract

The lifetimes of the first excited 2+, 4+, and 6+ states in Zr98 were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in Zr98 were populated using the fission reaction between a 6.2 MeV/u U238 beam and a Be9 target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small B(E2;21+→01+) value in Zr98, thereby confirming the very sudden onset of collectivity at N=60. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state. © 2018 American Physical Society.

Published
2018

30. Transition probabilities in neutron-rich 80, 82Se and the role of the νg9/2 orbital

Author

Litzinger, J., Blazhev, A., Dewald, A., Didierjean, F., Duchene, G., Fransen, C., Lozeva, R., Verney, D., de Angelis, G., Bazzacco, D., Birkenbach, B., Bottoni, S., Bracco, A., Braunroth, T., Cederwall, B., Corradi, L., Crespi, F. C. L., Desesquelles, P., Eberth, J., Ellinger, E., Farnea, E., Fioretto, E., Gernhauser, R., Goasduff, A., Gorgen, A., Gottardo, A., Grebosz, J., Hackstein, M., Hess, H., Ibrahim, F., Jolie, J., Jungclaus, A., Kolos, K., Korten, W., Leoni, S., Lunardi, S., Maj, A., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatović, Tea, Million, B., Moller, O., Modamio, V., Montagnoli, G., Montanari, D., Morales, A. I., Napoli, D. R., Niikura, M., Pietralla, N., Pollarolo, G., Pullia, A., Quintana, B., Recchia, F., Reiter, P., Rosso, D., Sahin, E., Salsac, M. D., Scarlassara, F., Soderstrom, P.-A., Stefanini, A. M., Stezowski, O., Szilner, Suzana, Theisen, Ch., Valiente-Dobon, J. J., Vandone, V., and Vogt, A.

Subjects
nuclear structure, intermediate-spin yrast and non-yrast excitations, Physics
Abstract

Transition probabilities of intermediate-spin yrast and non-yrast excitations in 80, 82Se were investigated in a recoil distance Doppler-shift (RDDS) experiment performed at the Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro. The Cologne Plunger device for deep inelastic scattering was used for the RDDS technique and was combined with the AGATA Demonstrator array for the γ-ray detection and coupled to the PRISMA magnetic spectrometer for an event-by-event particle identification. In 80Se, the level lifetimes of the yrast (6+1) and (8+1) states and of a non-yrast band feeding the yrast 4+1 state are determined. A spin and parity assignment of the head of this sideband is discussed based on the experimental results and supported by large-scale shell-model calculations. In 82Se, the level lifetimes of the yrast 6+1 state and the yrare 4+2 state and lifetime limits of the yrast (10+1) state and of the 5−1 state are determined. Although the experimental results contain large uncertainties, they are interpreted with care in terms of large-scale shell-model calculations using the effective interactions JUN45 and jj44b. The excited states' wave functions are investigated and discussed with respect to the role of the neutron g9/2 orbital.

Published
2018
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31. Transition probabilities in neutron-rich Se 80,82 and the role of the νg9/2 orbital

Author

Litzinger, J., Blazhev, A., Dewald, A., Didierjean, F., Duchêne, G., Fransen, C., Lozeva, R., Verney, D., Angelis, G. de, Bazzacco, D., Birkenbach, B., Bottoni, S., Bracco, A., Braunroth, T., Cederwall, B., Corradi, L., Crespi, F.C.L., Désesquelles, P., Eberth, J., Ellinger, E., Farnea, E., Fioretto, E., Gernhäuser, R., Goasduff, A., Görgen, A., Gottardo, A., Grebosz, J., Hackstein, M., Hess, H., Ibrahim, F., Jolie, J., Jungclaus, Andrea, Kolos, K., Korten, W., Leoni, S., Lunardi, S., Maj, A., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Million, B., Möller, O., Modamio, V., Montagnoli, G., Montanari, D., Morales, Ana Isabel, Napoli, D.R., Niikura, M., Quintana, B., Ministerio de Economía y Competitividad (España), Federal Ministry of Education and Research (Germany), German Research Foundation, European Commission, and Bonn-Cologne Graduate School of Physics and Astronomy

Abstract

13 pags., 12 figs., 4 tabs., Transition probabilities of intermediate-spin yrast and non-yrast excitations in Se80,82 were investigated in a recoil distance Doppler-shift (RDDS) experiment performed at the Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro. The Cologne Plunger device for deep inelastic scattering was used for the RDDS technique and was combined with the AGATA Demonstrator array for the γ-ray detection and coupled to the PRISMA magnetic spectrometer for an event-by-event particle identification. In Se80, the level lifetimes of the yrast (61+) and (81+) states and of a non-yrast band feeding the yrast 41+ state are determined. A spin and parity assignment of the head of this sideband is discussed based on the experimental results and supported by large-scale shell-model calculations. In Se82, the level lifetimes of the yrast 61+ state and the yrare 42+ state and lifetime limits of the yrast (101+) state and of the 51- state are determined. Although the experimental results contain large uncertainties, they are interpreted with care in terms of large-scale shell-model calculations using the effective interactions JUN45 and jj44b. The excited states' wave functions are investigated and discussed with respect to the role of the neutron g9/2 orbital., This work was partially supported by the European Union Seventh Framework Program FP7/2007-2013 under Grant Agreement No. 262010 ENSAR, by the German Research Foundation (DFG) under Contract No. DE 1516/3-1, by the German BMBF under Grant No. 05P15PKFNA and by the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2014-57196-C5-4-P. J.L. and A.V. thank the Bonn-Cologne Graduate School of Physics and Astronomy (BCGS) for financial support.

Published
2018

32. Low-lying electromagnetic transition strengths in 180 Pt

Author

Müller-Gatermann, C., Dewald, A., Fransen, C., Braunroth, T., Jolie, J., Litzinger, J., Regis, J. M., von Spee, F., Warr, N., Zell, K. O., Grahn, Tuomas, Greenlees, Paul, Hauschild, Karl, Jakobsson, Ulrika, Julin, Rauno, Juutinen, Sakari, Ketelhut, Steffen, Nieminen, Päivi, Nyman, Markus, Peura, Pauli, Rahkila, Panu, Ruotsalainen, Panu, Sandzelius, Mikael, Sarén, Jan, Scholey, Catherine, Sorri, Juha, Stolze, Sanna, Uusitalo, Juha, and Petkov, P.

Subjects
electromagnetic transition, Nuclear Experiment
Abstract

Lifetime measurements have been performed using the 98 Mo ( 86 Kr , 4 n ) 180 Pt reaction at a beam energy of 380 MeV, and the recoil distance Doppler-shift method. In a second experiment the 168 Yb ( 16 O , 4 n ) 180 Pt reaction at a beam energy of 88 MeV using the Ge-gated γ − γ fast timing technique was used to determine lifetimes. Lifetimes of the four lowest yrast states of 180 Pt have been determined. The experimental data are compared to calculations within the framework of the interacting boson model and the general collective model. Both models predict a deformed ground state and are consistent with all the remaining experimental results. peerReviewed

Published
2018

33. Transition probabilities in neutron-rich $^{80,82}$Se and the role of the $νg_{9/2}$ orbital

Author

Litzinger, J., Blazhev, A., Dewald, A., Didierjean, F., Duchêne, G., Fransen, C., Lozeva, R., Verney, D., De Angelis, G., Bazzacco, D., Birkenbach, B., Bottoni, S., Bracco, A., Braunroth, T., Cederwall, B., Corradi, L., Crespi, F.C.L., Désesquelles, P., Eberth, J., Ellinger, E., Farnea, E., Fioretto, E., Gernhäuser, R., Goasduff, A., Görgen, A., Gottardo, A., Grebosz, J., Hackstein, M., Hess, H., Ibrahim, F., Jolie, J., Jungclaus, A., Kolos, K., Korten, W., Leoni, S., Lunardi, S., Maj, A., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Million, B., Möller, O., Modamio, V., Montagnoli, G., Montanari, D., Morales, A.I., Napoli, D.R., Niikura, M., Pietralla, N., Pollarolo, G., Pullia, A., Quintana, B., Recchia, F., Reiter, P., Rosso, D., Sahin, E., Salsac, M.D., Scarlassara, F., Söderström, P.A., Stefanini, A.M., Stezowski, O., Szilner, S., Theisen, Ch., Valiente-Dobón, J.J., Vandone, V., Vogt, A., Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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 de Physique Nucléaire d'Orsay (IPNO), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-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), 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), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

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

International audience; Transition probabilities of intermediate-spin yrast and non-yrast excitations in Se80,82 were investigated in a recoil distance Doppler-shift (RDDS) experiment performed at the Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro. The Cologne Plunger device for deep inelastic scattering was used for the RDDS technique and was combined with the AGATA Demonstrator array for the γ-ray detection and coupled to the PRISMA magnetic spectrometer for an event-by-event particle identification. In Se80, the level lifetimes of the yrast (61+) and (81+) states and of a non-yrast band feeding the yrast 41+ state are determined. A spin and parity assignment of the head of this sideband is discussed based on the experimental results and supported by large-scale shell-model calculations. In Se82, the level lifetimes of the yrast 61+ state and the yrare 42+ state and lifetime limits of the yrast (101+) state and of the 51− state are determined. Although the experimental results contain large uncertainties, they are interpreted with care in terms of large-scale shell-model calculations using the effective interactions JUN45 and jj44b. The excited states' wave functions are investigated and discussed with respect to the role of the neutron g9/2 orbital.

Published
2018
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34. Evidence for coexisting shapes through lifetime measurements in 98Zr

Author

Singh, Purnima, Korten, Wolfram, Hagen, Trine Wiborg, Görgen, Andreas, Grente, Lucie, Salsac, Marie Delphine, Farget, F., Braunroth, T, Bruyneel, Bart, Celikovic, I, Clement, E, de France, G., Delaune, O, Dewald, Alfred, Dijon, Aurore, Delaroche, Jean Paul, Girod, Michel, Hackstein, Matthias, Jacquot, Bertrand, Libert, J., Litzinger, J, Ljungvall, Joa, Louchart, C, Gottardo, Andrea, Michelagnoli, Caterina, Napoli, D.R., Otsuka, Takaharu, Pillet, N., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, B, Togashi, T., Theisen, Christophe, and Valiente-Dobón, Jose Javier

Subjects
Nuclear Experiment
Abstract

The lifetimes of the first excited 2þ, 4þ, and 6þ states in 98Zr were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in 98Zr were populated using the fission reaction between a 6.2 MeV=u 238U beam and a 9 Be target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small BðE2; 2þ 1 → 0þ 1 Þ value in 98Zr, thereby confirming the very sudden onset of collectivity at N ¼ 60. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state.

Published
2018

35. Evidence for Coexisting Shapes through Lifetime Measurements in $^{98}$Zr

Author

Singh, Purnima, Korten, W., Hagen, T.W., Görgen, A., Grente, L., Salsac, M.-D., Farget, F., Clément, E., De France, G., Braunroth, T., Bruyneel, B., Celikovic, I., Delaune, O., Dewald, A., Dijon, A., Delaroche, J.-P., Girod, M., Hackstein, M., Jacquot, B., Libert, J., Litzinger, J., Ljungvall, J., Louchart, C., Gottardo, A., Michelagnoli, C., Müller-Gatermann, C., Napoli, D.R., Otsuka, T., Pillet, N., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Togashi, T., Tsunoda, Y., Theisen, Ch., Valiente-Dobon, J.J., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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 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
Physics and Astronomy (all), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Physics
Abstract

The lifetimes of the first excited 2^{+}, 4^{+}, and 6^{+} states in ^{98}Zr were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in ^{98}Zr were populated using the fission reaction between a 6.2 MeV/u ^{238}U beam and a ^{9}Be target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small B(E2;2_{1}^{+}→0_{1}^{+}) value in ^{98}Zr, thereby confirming the very sudden onset of collectivity at N=60. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state.

Published
2018
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36. Evidence for Coexisting Shapes through Lifetime Measurements in Zr98

Author

Singh, Purnima, primary, Korten, W., additional, Hagen, T. W., additional, Görgen, A., additional, Grente, L., additional, Salsac, M.-D., additional, Farget, F., additional, Clément, E., additional, de France, G., additional, Braunroth, T., additional, Bruyneel, B., additional, Celikovic, I., additional, Delaune, O., additional, Dewald, A., additional, Dijon, A., additional, Delaroche, J.-P., additional, Girod, M., additional, Hackstein, M., additional, Jacquot, B., additional, Libert, J., additional, Litzinger, J., additional, Ljungvall, J., additional, Louchart, C., additional, Gottardo, A., additional, Michelagnoli, C., additional, Müller-Gatermann, C., additional, Napoli, D. R., additional, Otsuka, T., additional, Pillet, N., additional, Recchia, F., additional, Rother, W., additional, Sahin, E., additional, Siem, S., additional, Sulignano, B., additional, Togashi, T., additional, Tsunoda, Y., additional, Theisen, Ch., additional, and Valiente-Dobon, J. J., additional

Published
2018
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37. Low collectivity of the first 2+ states of 212,210Po

Author

Kocheva, D., primary, Rainovski, G., additional, Jolie, J., additional, Pietralla, N., additional, Blazhev, A., additional, Astier, A., additional, Altenkirch, R., additional, Bast, M., additional, Beckers, M., additional, Ansari, S., additional, Braunroth, Th., additional, Cappellazzo, M., additional, Cortés, M.L., additional, Dewald, A., additional, Diel, F., additional, Djongolov, M., additional, Fransen, C., additional, Gladnishki, K., additional, Goldkuhle, A., additional, Hennig, A., additional, Karayonchev, V., additional, Keatings, J.M., additional, Kluge, E., additional, Kröll, Th., additional, Litzinger, J., additional, Moschner, K., additional, Müller-Gatermann, C., additional, Petkov, P., additional, Rudigier, M., additional, Scheck, M., additional, Spagnoletti, P., additional, Scholz, Ph., additional, Schmidt, T., additional, Spieker, M., additional, Stahl, C., additional, Stegmann, R., additional, Stolz, A., additional, Vogt, A., additional, Stoyanova, M., additional, Thöle, P., additional, Warr, N., additional, Werner, V., additional, Witt, W., additional, Wölk, D., additional, Zamora, J.C., additional, Zell, K.O., additional, Van Isacker, P., additional, and Ponomarev, V.Yu., additional

Published
2018
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38. Transition probabilities in neutron-rich Se80,82 and the role of the νg9/2 orbital

Author

Litzinger, J., primary, Blazhev, A., additional, Dewald, A., additional, Didierjean, F., additional, Duchêne, G., additional, Fransen, C., additional, Lozeva, R., additional, Verney, D., additional, de Angelis, G., additional, Bazzacco, D., additional, Birkenbach, B., additional, Bottoni, S., additional, Bracco, A., additional, Braunroth, T., additional, Cederwall, B., additional, Corradi, L., additional, Crespi, F. C. L., additional, Désesquelles, P., additional, Eberth, J., additional, Ellinger, E., additional, Farnea, E., additional, Fioretto, E., additional, Gernhäuser, R., additional, Goasduff, A., additional, Görgen, A., additional, Gottardo, A., additional, Grebosz, J., additional, Hackstein, M., additional, Hess, H., additional, Ibrahim, F., additional, Jolie, J., additional, Jungclaus, A., additional, Kolos, K., additional, Korten, W., additional, Leoni, S., additional, Lunardi, S., additional, Maj, A., additional, Menegazzo, R., additional, Mengoni, D., additional, Michelagnoli, C., additional, Mijatovic, T., additional, Million, B., additional, Möller, O., additional, Modamio, V., additional, Montagnoli, G., additional, Montanari, D., additional, Morales, A. I., additional, Napoli, D. R., additional, Niikura, M., additional, Pietralla, N., additional, Pollarolo, G., additional, Pullia, A., additional, Quintana, B., additional, Recchia, F., additional, Reiter, P., additional, Rosso, D., additional, Sahin, E., additional, Salsac, M. D., additional, Scarlassara, F., additional, Söderström, P.-A., additional, Stefanini, A. M., additional, Stezowski, O., additional, Szilner, S., additional, Theisen, Ch., additional, Valiente-Dobón, J. J., additional, Vandone, V., additional, and Vogt, A., additional

Published
2018
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39. Low-lying electromagnetic transition strengths in Pt180

Author

Müller-Gatermann, C., primary, Dewald, A., additional, Fransen, C., additional, Braunroth, T., additional, Jolie, J., additional, Litzinger, J., additional, Régis, J. M., additional, von Spee, F., additional, Warr, N., additional, Zell, K. O., additional, Grahn, T., additional, Greenlees, P. T., additional, Hauschild, K., additional, Jakobsson, U., additional, Julin, R., additional, Juutinen, S., additional, Ketelhut, S., additional, Nieminen, P., additional, Nyman, M., additional, Peura, P., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scholey, C., additional, Sorri, J., additional, Stolze, S., additional, Uusitalo, J., additional, and Petkov, P., additional

Published
2018
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40. Enhanced collectivity along the N = Z line: lifetime measurements in 44Ti, 48Cr, and 52Fe

Author

Arnswald, K., primary, Reiter, P., additional, Coraggio, L., additional, Birkenbach, B., additional, Blazhev, A., additional, Braunroth, T., additional, Dewald, A., additional, Fransen, C., additional, Fu, B., additional, Gargano, A., additional, Hess, H., additional, Hirsch, R., additional, Itaco, N., additional, Lenzi, S. M., additional, Lewandowski, L., additional, Litzinger, J., additional, Müller-Gatermann, C., additional, Queiser, M., additional, Rosiak, D., additional, Schneiders, D., additional, Seidlitz, M., additional, Siebeck, B., additional, Steinbach, T., additional, Vogt, A., additional, Wolf, K., additional, and Zell, K. O., additional

Published
2018
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41. Transition probabilities in neutron-rich Se-80,Se-82 and the role of the nu g(9/2) orbital

Author

Litzinger, J., Blazhev, A., Dewald, A., Didierjean, F., Duchene, G., Fransen, C., Lozeva, R., Verney, D., de Angelis, G., Bazzacco, D., Birkenbach, B., Bottoni, S., Bracco, A., Braunroth, T., Cederwall, Bo, Corradi, L., Crespi, F. C. L., Desesquelles, P., Eberth, J., Ellinger, E., Farnea, E., Fioretto, E., Gernhaeuser, R., Goasduff, A., Gorgen, A., Gottardo, A., Grebosz, J., Hackstein, M., Hess, H., Ibrahim, F., Jolie, J., Jungclaus, A., Kolos, K., Korten, W., Leoni, S., Lunardi, S., Maj, A., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Million, B., Moeller, O., Modamio, V., Montagnoli, G., Montanari, D., Morales, A. I., Napoli, D. R., Niikura, M., Pietralla, N., Pollarolo, G., Pullia, A., Quintana, B., Recchia, F., Reiter, P., Rosso, D., Sahin, E., Salsac, M. D., Scarlassara, F., Soderstroem, P. -A, Stefanini, A. M., Stezowski, O., Szilner, S., Theisen, Ch., Valiente-Dobon, J. J., Vandone, V., Vogt, A., Litzinger, J., Blazhev, A., Dewald, A., Didierjean, F., Duchene, G., Fransen, C., Lozeva, R., Verney, D., de Angelis, G., Bazzacco, D., Birkenbach, B., Bottoni, S., Bracco, A., Braunroth, T., Cederwall, Bo, Corradi, L., Crespi, F. C. L., Desesquelles, P., Eberth, J., Ellinger, E., Farnea, E., Fioretto, E., Gernhaeuser, R., Goasduff, A., Gorgen, A., Gottardo, A., Grebosz, J., Hackstein, M., Hess, H., Ibrahim, F., Jolie, J., Jungclaus, A., Kolos, K., Korten, W., Leoni, S., Lunardi, S., Maj, A., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Million, B., Moeller, O., Modamio, V., Montagnoli, G., Montanari, D., Morales, A. I., Napoli, D. R., Niikura, M., Pietralla, N., Pollarolo, G., Pullia, A., Quintana, B., Recchia, F., Reiter, P., Rosso, D., Sahin, E., Salsac, M. D., Scarlassara, F., Soderstroem, P. -A, Stefanini, A. M., Stezowski, O., Szilner, S., Theisen, Ch., Valiente-Dobon, J. J., Vandone, V., and Vogt, A.

Abstract

Transition probabilities of intermediate-spin yrast and non-yrast excitations in Se-80,Se-82 were investigated in a recoil distance Doppler-shift (RDDS) experiment performed at the Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro. The Cologne Plunger device for deep inelastic scattering was used for the RDDS technique and was combined with the AGATA Demonstrator array for the gamma-ray detection and coupled to the PRISMA magnetic spectrometer for an event-by-event particle identification. In Se-80, the level lifetimes of the yrast (6(1)(+)) and (8(1)(+)) states and of a non-yrast band feeding the yrast 4(1)(+) state are determined. A spin and parity assignment of the head of this sideband is discussed based on the experimental results and supported by large-scale shell-model calculations. In Se-82, the level lifetimes of the yrast 6(1)(+) state and the yrare 4(2)(+) state and lifetime limits of the yrast (10(1)(+)) state and of the 5(1)(-) state are determined. Although the experimental results contain large uncertainties, they are interpreted with care in terms of large-scale shell-model calculations using the effective interactions JUN45 and jj44b. The excited states' wave functions are investigated and discussed with respect to the role of the neutron g(9/2) orbital., QC 20180723

Published
2018
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42. Low-lying electromagnetic transition strengths in Pt-180

Author

Mueller-Gatermann, C., Dewald, A., Fransen, C., Braunroth, T., Jolie, J., Litzinger, J., Regis, J. M., von Spee, F., Warr, N., Zell, K. O., Grahn, T., Greenlees, P. T., Hauschild, K., Jakobsson, U., Julin, R., Juutinen, S., Ketelhut, S., Nieminen, P., Nyman, M., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Uusitalo, J., Petkov, P., Mueller-Gatermann, C., Dewald, A., Fransen, C., Braunroth, T., Jolie, J., Litzinger, J., Regis, J. M., von Spee, F., Warr, N., Zell, K. O., Grahn, T., Greenlees, P. T., Hauschild, K., Jakobsson, U., Julin, R., Juutinen, S., Ketelhut, S., Nieminen, P., Nyman, M., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Uusitalo, J., and Petkov, P.

Abstract

Lifetime measurements have been performed using the Mo-98(Kr-86, 4n)Pt-180 reaction at a beam energy of 380 MeV, and the recoil distance Doppler-shift method. In a second experiment the Yb-168(O-16, 4n)Pt-180 reaction at a beam energy of 88 MeV using the Ge-gated gamma-gamma fast timing technique was used to determine lifetimes. Lifetimes of the four lowest yrast states of Pt-180 have been determined. The experimental data are compared to calculations within the framework of the interacting boson model and the general collective model. Both models predict a deformed ground state and are consistent with all the remaining experimental results.

Published
2018

43. Lifetimes of excited states in triaxially deformed Tc-107 and Rh-109,Rh-111,Rh-113

Author

Hagen, T. W., Gorgen, A., Korten, W., Grente, L., Salsac, M. -D., Farget, F., Braunroth, T., Bruyneel, B., Celikovic, I., Clement, E., de France, G., Delaune, O., Dewald, A., Dijon, A., Hackstein, M., Jacquot, B., Litzinger, J., Ljungvall, J., Louchart, C., Michelagnoli, C., Napoli, D. R., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Theisen, Ch., Valiente-Dobon, J. J., Hagen, T. W., Gorgen, A., Korten, W., Grente, L., Salsac, M. -D., Farget, F., Braunroth, T., Bruyneel, B., Celikovic, I., Clement, E., de France, G., Delaune, O., Dewald, A., Dijon, A., Hackstein, M., Jacquot, B., Litzinger, J., Ljungvall, J., Louchart, C., Michelagnoli, C., Napoli, D. R., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Theisen, Ch., and Valiente-Dobon, J. J.

Abstract

Lifetimes of excited states in Tc-107, Rh-109, Rh-111, and Rh-113 were measured at GANIL using the Recoil-Distance Doppler Shift method. The neutron-rich nuclei were produced in fission reactions in inverse kinematics with a U-238 beam impinging on a Be-9 target. Fission fragments were identified event-by-event in the ray-tracing spectrometer VAMOS++ and correlated with prompt gamma rays observed around the target position with the EXOGAM Ge detector array. Several lifetimes were obtained for states in the positiveparity yrast bands in the four nuclei and compared to triaxial particle-rotor calculations. The results clarify the configuration for the strongest positive-parity band in Tc-107 and suggest a gradual increase of triaxial deformation with atomic number Z, reaching almost maximum triaxiality for the neutron-rich Rh nuclei.

Published
2018

44. Evidence for Coexisting Shapes through Lifetime Measurements in Zr-98

Author

Singh, Purnima, Korten, W., Hagen, T. W., Gorgen, A., Grente, L., Salsac, M-D, Farget, F., Clement, E., de France, G., Braunroth, T., Bruyneel, B., Celikovic, I, Delaune, O., Dewald, A., Dijon, A., Delaroche, J-P, Girod, M., Hackstein, M., Jacquot, B., Libert, J., Litzinger, J., Ljungvall, J., Louchart, C., Gottardo, A., Michelagnoli, C., Mueller-Gatermann, C., Napoli, D. R., Otsuka, T., Pillet, N., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Togashi, T., Tsunoda, Y., Theisen, Ch, Valiente-Dobon, J. J., Singh, Purnima, Korten, W., Hagen, T. W., Gorgen, A., Grente, L., Salsac, M-D, Farget, F., Clement, E., de France, G., Braunroth, T., Bruyneel, B., Celikovic, I, Delaune, O., Dewald, A., Dijon, A., Delaroche, J-P, Girod, M., Hackstein, M., Jacquot, B., Libert, J., Litzinger, J., Ljungvall, J., Louchart, C., Gottardo, A., Michelagnoli, C., Mueller-Gatermann, C., Napoli, D. R., Otsuka, T., Pillet, N., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Togashi, T., Tsunoda, Y., Theisen, Ch, and Valiente-Dobon, J. J.

Abstract

The lifetimes of the first excited 2(+), 4(+), and 6(+) states in Zr-98 were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in Zr-98 were populated using the fission reaction between a 6.2 MeV/u U-238 beam and a Be-9 target. The gamma rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small B(E2; 2(1)(+) -> 0(1)(+)) value in Zr-98, thereby confirming the very sudden onset of collectivity at N = 60. The experimenta(l) results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground State.

Published
2018

45. Neutron effective single-particle energies above Ni 78: A hint from lifetime measurements in the N=51 isotones Se 85 and Kr 87

Author

Didierjean, F., Verney, D., Duchãªne, G., Litzinger, J., Sieja, K., Dewald, A., Goasduff, A., Lozeva, R., Fransen, C., De Angelis, G., Aydin, S., Bazzacco, D., Bracco, A., Bottoni, S., Corradi, L., Crespi, F., Ellinger, E., Farnea, E., Fioretto, E., Franchoo, S., Gottardo, A., Grocutt, L., Hackstein, M., Ibrahim, F., Kolos, K., Leoni, S., Lenzi, S., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Modamio, V., Mã¶ller, O., Montagnoli, G., Montanari, D., Morales, A. I., Napoli, D., Niikura, M., Recchia, F., Sahin, E., Scarlassara, F., Sengele, L., Szilner, S., Smith, J. F., Stefanini, A. M., Ur, C., Valiente-Dobón, J. J., and Vandone, V.

Subjects
Nuclear and High Energy Physics
Published
2017

46. A revised B(E2; 2$^{+}_{1} \to 0^{+}_{1}$) value in the semi-magic nucleus $^{210}$Po

Author

Kocheva , D., Rainovski , G., Jolie , J., Pietralla , N., Blazhev , A., Astier , A., Altenkirch , R., Ansari , S., Braunroth , Th., Cortés , M.L., Dewald , A., Diel , F., Djongolov , M., Fransen , C., Gladnishki , K., Hennig , A., Karayonchev , V., Keatings , J.M., Kluge , E., Litzinger , J., Müller-Gatermann , C., Petkov , P., Rudigier , M., Scheck , M., Scholz , Ph., Spagnoletti , P., Spieker , M., Stahl , C., Stegmann , R., Stoyanova , M., Thöle , P., Warr , N., Werner , V., Zell , K.O., Van Isacker , P., Ponomarev , V.Yu., Wölk , D., Witt , W., Centre de Sciences Nucléaires et de Sciences de la Matière (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), 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), 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), 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 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 ), Grand Accélérateur National d'Ions Lourds ( GANIL ), and 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 )

Subjects
Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 25.45.Hi, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 190 ≤ A ≤ 219, Random-phase approximations, 27.80.+w, Nuclear Theory (nucl-th), Electromagnetic transitions, Transfer reactions, 21.60.Jz, 21.10.Tg, 23.20.-g, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, [ PHYS.NUCL ] Physics [physics]/Nuclear Theory [nucl-th]
Abstract

International audience; The lifetimes of the $ 2^+_1$ , the $ 2^+_2$ and the $ 3^-_1$ states of$^{210}$Po have been measured in the$^{208}$Pb($^{12}$C,$^{10}$Be)$^{210}$Po transfer reaction by the Doppler-shift attenuation method. The result for the lifetime of the $ 2^+_1$ state is about three times shorter than the adopted value. However, the new value still does not allow for a consistent description of the properties of the yrast $ 2^+_1$ , $ 4^+_1$ , $ 6^+_1$ , and $ 8^+_1$ states of$^{210}$Po in the framework of nuclear shell models. Quasi-particle Phonon Model (QPM) calculations also cannot overcome this problem thus indicating the existence of a peculiarity which is neglected in both theoretical approaches.

Published
2017
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47. Low collectivity of the ${2}_{1}^{+}$ state of $^{212}\mathrm{Po}$

Author

Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Altenkirch, R., Ansari, S., Astier, A., Bast, M., Beckers, M., Braunroth, Th., Cappellazzo, M., Dewald, A., Diel, F., Djongolov, M., Fransen, C., Gladnishki, K., Goldkuhle, A., Hennig, A., Karayonchev, V., Keatings, J.M., Kluge, E., Kröll, Th., Litzinger, J., Moschner, K., Müller-Gatermann, C., Petkov, P., Scheck, M., Scholz, Ph., Schmidt, T., Spagnoletti, P., Stahl, C., Stegmann, R., Stolz, A., Vogt, A., Warr, N., Werner, V., Wölk, D., Zamora, J.C., Zell, K.O., Ponomarev, V.Yu., Van Isacker, P., 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), 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; The lifetime of the $2^+_1$ state of $^{212}$Po was measured in the $^{208}$Pb($^{12}$C,$^{8}$Be)$^{212}$Po transfer reaction by γ -ray spectroscopy employing the recoil distance Doppler shift (RDDS) method. The derived absolute B(E2) value of 2.6(3)W.u. indicates a low collectivity and contradicts previous claims of α-cluster components in the structure of the $2^+_1$ state. It is demonstrated that a consistent description of the properties of the $2^+_1$−$4^+_1$−$6^+_1$−$8^+_1$ sequence in $^{212}$Po cannot be achieved in the framework of a single-j shell-model calculation, either. This puzzle is traced to the properties of the seniority-2 configurations in $^{210}$Pb and $^{210}$Po.

Published
2017
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48. Lifetime measurements in 52,54Ti to study shell evolution toward N=32

Author

Goldkuhle, A., Fransen, C., Blazhev, A., Beckers, M., Birkenbach, B., Braunroth, T., Clément, E., Dewald, A., Dudouet, J., Eberth, J., Hess, H., Jacquot, B., Jolie, J., Kim, Y.H., Lemasson, A., Lenzi, S.M., Li, H.J., Litzinger, J., Michelagnoli, C., Müller-Gatermann, C., Nara Singh, B.S., Pérez-Vidal, R.M., Ralet, D., Reiter, P., Vogt, A., Warr, N., Zell, K.O., Ataç, A., Barrientos, D., Barthe-Dejean, C., Benzoni, G., Boston, A.J., Boston, H.C., Bourgault, P., Burrows, I., Cacitti, J., Cederwall, B., Ciemala, M., Cullen, D.M., De France, G., Domingo-Pardo, C., Foucher, J.L., Fremont, G., Gadea, A., Gangnant, P., González, V., Goupil, J., Henrich, C., Houarner, C., Jean, M., Judson, D.S., Korichi, A., Korten, W., Labiche, M., Lefevre, A., Legeard, L., Legruel, F., Leoni, S., Ljungvall, J., Maj, A., Maugeais, C., Ménager, L., Ménard, N., Menegazzo, R., Mengoni, D., Million, B., Munoz, H., Napoli, D.R., Navin, A., Nyberg, J., Ozille, M., Podolyak, Zs., Pullia, A., Raine, B., Recchia, F., Ropert, J., Saillant, F., Salsac, M.D., Sanchis, E., Schmitt, C., Simpson, J., Spitaels, C., Stezowski, O., Theisen, Ch., Toulemonde, M., Tripon, M., Valiente Dobón, J.J., Voltolini, G., 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), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), AGATA, ILL, Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), 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), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

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

International audience; Lifetimes of the excited states in the neutron-rich Ti52,54 nuclei, produced in a multinucleon-transfer reaction, were measured by employing the Cologne plunger device and the recoil-distance Doppler-shift method. The experiment was performed at the Grand Accélérateur National d'Ions Lourds facility by using the Advanced Gamma Tracking Array for the γ-ray detection, coupled to the large-acceptance variable mode spectrometer for an event-by-event particle identification. A comparison between the transition probabilities obtained from the measured lifetimes of the 21+ to 81+ yrast states in Ti52,54 and that from the shell-model calculations based on the well-established GXPF1A, GXPF1B, and KB3G fp shell interactions support the N=32 subshell closure. The B(E2) values for Ti52 determined in this work are in disagreement with the known data, but are consistent with the predictions of the shell-model calculations and reduce the previously observed pronounced staggering across the even-even titanium isotopes.

Published
2019
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49. Lifetime measurements in Pd-102: Searching for empirical proof of the E(5) critical-point symmetry in nuclear structure

Author

Konstantinopoulos, T., Ashley, S. F., Axiotis, M., Spyrou, A., Harissopulos, S., Dewald, A., Litzinger, J., Möller, O., Müller Gatterman, C., Petkov, P., Napoli, D. R., Marginean, N., De Angelis, G., C. A., Ur, Bazzacco, D., Farnea, E., Lenzi, SILVIA MONICA, Vlastou, R., Balabanski, D., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM SNO), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Univ. Paris-Sud, Institute of Nuclear and Particle Physics, NCRS Demokritos, and National Centre for Scientific Research 'Demokritos'

Subjects
[PHYS]Physics [physics], Nuclear and High Energy Physics, STATES, DECAY CURVE METHOD, EVEN-EVEN NUCLEI, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], LIMIT
Abstract

International audience; Lifetimes of yrast and nonyrast states of Pd-102 populated via the Zr-92(C-13, 3n) reaction are measured by means of the recoil distance Doppler-shift technique with a Cologne plunger coupled to a GASP spectrometer. The event-by-event data accumulated at 24 plunger distances in the range of 0.1 mu m to 9 mm are analyzed using the differential decay curve method. The resulting B(E2) values of the gamma transitions depopulating yrast-band members up to the I-pi = 8(+) state are found to deviate significantly from the corresponding predictions of the E(5) critical-point symmetry.

Published
2016
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50. Low-lying isovector 2+ valence-shell excitations of $^{212}$Po

Author

Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Stahl, Clement, Petkov, P., Blazhev, A., Hennig, A., Astier, A., Braunroth, Th., Cortes, M. L., Dewald, A., Djongolov, M., Fransen, C., Gladnishki, K., Karayonchev, V., Litzinger, J., Muller-Gatermann, C., Scheck, M., Scholz, Ph., Stegmann, R., Thole, P., Werner, V., Witt, W., Wolk, D., van Isacker, P., Centre de Sciences Nucléaires et de Sciences de la Matière (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), 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), 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 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)

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

International audience; We present the results from an experiment dedicated to search for quadrupole-collective isovector valence-shellexcitations, states with so-called mixed proton-neutron symmetry (MSS), of 212Po. This nucleus was studiedin an α-transfer reaction. The lifetimes of two short-lived excited states, candidates for the one-phonon MSS,were determined by utilizing the Doppler shift attenuation method. The experimental results are in qualitativeagreement with a simple single-j shell model calculation, which, together with the observed lack of quadrupolecollectivity, indicates that the isovector nature of low-lying states is a property of the leading single-particlevalence shell configuration.

Published
2016
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