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1. 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

2. 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

3. 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

4. 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

5. 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

6. 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., Clement, E., 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., Goldkuhle, A., Blazhev, A., Fransen, C., Dewald, A., Beckers, M., Birkenbach, B., Braunroth, T., Clement, E., 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., and Zell, K. O.
Abstract: Level lifetimes of the yrast (5/2(-)) to 13/2(-) states in the neutron-rich nucleus Ti-53, 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 Accelerateur National d'Ions Lourds facility in Caen, France, 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 and the Cologne plunger for deep-inelastic reactions. Reduced transition probabilities, deduced from the lifetimes, give new information on the nuclear structure of Ti-53, and are used to benchmark different shell-model calculations using established interactions in the f p shell.
Published: 2020

7. 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

8. 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

9. 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., Clement, E., 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., Goldkuhle, A., Blazhev, A., Fransen, C., Dewald, A., Beckers, M., Birkenbach, B., Braunroth, T., Clement, E., 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., and Zell, K. O.
Abstract: Level lifetimes of the yrast (5/2(-)) to 13/2(-) states in the neutron-rich nucleus Ti-53, 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 Accelerateur National d'Ions Lourds facility in Caen, France, 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 and the Cologne plunger for deep-inelastic reactions. Reduced transition probabilities, deduced from the lifetimes, give new information on the nuclear structure of Ti-53, and are used to benchmark different shell-model calculations using established interactions in the f p shell.
Published: 2020

10. 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, Lukas, 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, Lukas, 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

11. 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

12. 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., Zielinska, M., 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.
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
Full Text: View/download PDF

13. 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., Zielinska, M., 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.
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
Full Text: View/download PDF

14. 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., Zielinska, M., 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.
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
Full Text: View/download PDF

15. 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

16. 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

17. 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

18. 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, 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., Dobon, J-J Valiente, Voltolini, G., Zielinska, M., 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, 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., Dobon, J-J Valiente, Voltolini, G., and Zielinska, M.
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

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., Zielinska, M., 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.
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
Full Text: View/download PDF

20. 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

21. 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

22. 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

23. 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, 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., Dobon, J-J Valiente, Voltolini, G., Zielinska, M., 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, 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., Dobon, J-J Valiente, Voltolini, G., and Zielinska, M.
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

24. 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., Zielinska, M., 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.
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
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25. 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, E., Siem, Sunniva, Sulignano, Barbara, Togashi, Tomoaki, Tsunoda, Yuhsuke, Theisen, Christophe, Valiente-Dobon, Jose Javier, 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, E., Siem, Sunniva, Sulignano, Barbara, Togashi, Tomoaki, Tsunoda, Yuhsuke, Theisen, Christophe, and Valiente-Dobon, Jose Javier
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

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

Author: Hagen, T. W., Gorgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, E., Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, Valiente-Dobon, Jose Javier, Hagen, T. W., Gorgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, E., Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, and Valiente-Dobon, Jose Javier
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

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

Author: Hagen, T. W., Gorgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, Valiente-Dobon, Jose Javier, Hagen, T. W., Gorgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, and Valiente-Dobon, Jose Javier
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

29. 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

30. 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

31. 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, B., 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, B., 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.
Published: 2018

32. 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

33. 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

34. 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

35. 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, B., 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, B., 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.
Published: 2018

36. 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

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

Author: Hagen, T. W., Gorgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, Valiente-Dobon, Jose Javier, Hagen, T. W., Gorgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, and Valiente-Dobon, Jose Javier
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

38. Evolution of nuclear shapes in odd-mass yttrium and niobium isotopes from lifetime measurements following fission reactions

Author: Hagen, T. W., Goergen, A., Korten, W., Grente, L., Salsac, M. -D., Farget, F., Ragnarsson, I., 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., Goergen, A., Korten, W., Grente, L., Salsac, M. -D., Farget, F., Ragnarsson, I., 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 Y-99, Y-101, Nb-101, Nb-103, and Nb-105 were measured in an experiment using the recoil distance Doppler shift method at GANIL (Grand Accelerateur National d'Ions Lourds). The neutron-rich nuclei were produced in fission reactions between a U-238 beam and a Be-9 target. Prompt gamma rays were measured with the EXOGAM array and correlated with fission fragments that were identified in mass and atomic number with the VAMOS++ spectrometer. The measured lifetimes, together with branching ratios, provide B(M1) and B(E2) values for the strongly coupled rotational bands built on the [422] 5/2(+) ground state in the Y and Nb nuclei with neutron number N >= 60. The comparison of the experimental results with triaxial particle-rotor calculations provides information about the evolution of the nuclear shape in this mass region.
Published: 2017

39. Enhanced collectivity along the N = Z line: Lifetime measurements in Ti-44, Cr-48, and Fe-52

Author: Arnswald, K., Braunroth, T., Seidlitz, M., Coraggio, L., Reiter, P., Birkenbach, B., Blazhev, A., Dewald, A., Fransen, C., Fu, B., Gargano, A., Hess, H., Hirsch, R., Itaco, N., Lenzi, S. M., Lewandowski, L., Litzinger, J., Mueller-Gatermann, C., Queiser, M., Rosiak, D., Schneiders, D., Siebeck, B., Steinbach, T., Vogt, A., Wolf, K., Zell, K. O., Arnswald, K., Braunroth, T., Seidlitz, M., Coraggio, L., Reiter, P., Birkenbach, B., Blazhev, A., Dewald, A., Fransen, C., Fu, B., Gargano, A., Hess, H., Hirsch, R., Itaco, N., Lenzi, S. M., Lewandowski, L., Litzinger, J., Mueller-Gatermann, C., Queiser, M., Rosiak, D., Schneiders, D., Siebeck, B., Steinbach, T., Vogt, A., Wolf, K., and Zell, K. O.
Abstract: Lifetimes of the 2(1)(+) states in Ti-44, Cr-48,Cr-50, and Fe-52 were determined with high accuracy exploiting the recoil distance Doppler-shift method. The reduced E2 transition strengths of Ti-44 and Fe-52 differ considerably from previously known values. A systematic increase in collectivity is found for the N = Z nuclei compared to neighboring isotopes. The B(E2) values along the Ti, Cr, and Fe isotopic chains are compared to shell-model calculations employing established interactions for the 0 f 1p shell, as well as a novel effective shell-model Hamiltonian starting from a realistic nucleon-nucleon potential. The theoretical approaches underestimate the B(E2) values for the lower-mass Ti isotopes. Strong indication is found for particle-hole cross-shell configurations, recently corroborated by similar results for the neighboring isotone Ca-42. (C) 2017 The Author(s). Published by Elsevier B.V.
Published: 2017

40. 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., Duchene, 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., Moeller, 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-Dobon, J. J., Vandone, V., Didierjean, F., Verney, D., Duchene, 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., Moeller, 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-Dobon, J. J., and Vandone, V.
Abstract: Background: While the N = 50 shell-gap evolution towards Ni-78 is presently in the focus of nuclear structure research, experimental information on the neutron effective single-particle energy sequence above the Ni-78 core remain scarce. Direct nucleon-exchange reactions are indeed difficult with presently available post-accelerated radioactive-ion beams (especially for high orbital-momentum orbitals) in this exotic region. Purpose: In this study we probe the evolution of the vlg(7/2)effective single-particle energy which is a key to understanding the possible evolution of the spin-orbit splitting due to the proton-neutron interaction in the Ni-78 region. To achieve this goal, a method based on lifetime measurements is used for the first time. The obtained lifetimes of the 7/2(1)(-) states in Kr-87 and Se-85 are used to investigate the vlg7/2 evolution. Method: Yrast and near-yrast states in the light N = 51 isotones Se-85 and Kr-87 were populated via multinucleon transfer reactions, using a Se-82 beam and a U-238 target at the LNL tandem-ALPI facility. The prompt y rays were detected by the AGATA Demonstrator and particle identification was performed using the PRISMA spectrometer. Lifetime measurements were performed by using the Cologne plunger device for deep inelastic reactions and the Recoil Distance Doppler Shift technique. Results: We obtain (tau(7/21+)) = 0.4(-0.4)(+1.6) ps for Kr-87. In the case of Se-85 an upper limit of 3(2) ps is obtained for the (tau(7/21+)) value. Conclusion: For Kr-87, the measured (7/2(1)(+)) lifetime is consistent with a core-coupled 2(+) circle times v2d(5/2) configuration for this state. This result is consistent with that obtained by direct reaction, which validates our method. For Se-85, the measured (7/2(1)(+)) lifetime limit indicates a very small contribution of the vlg(7/2) configuration to the wave function of this state.
Published: 2017

41. Low collectivity of the 2(1)(+) state of Po-212

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., Kroell, Th., Litzinger, J., Moschner, K., Mueller-Gatermann, C., Petkov, P., Scheck, M., Scholz, Ph., Schmidt, T., Spagnoletti, P., Stahl, C., Stegmann, R., Stolz, A., Vogt, A., Warr, N., Werner, V., Woelk, D., Zamora, J. C., Zell, K. O., Ponomarev, V. Yu., Van Isacker, P., 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., Kroell, Th., Litzinger, J., Moschner, K., Mueller-Gatermann, C., Petkov, P., Scheck, M., Scholz, Ph., Schmidt, T., Spagnoletti, P., Stahl, C., Stegmann, R., Stolz, A., Vogt, A., Warr, N., Werner, V., Woelk, D., Zamora, J. C., Zell, K. O., Ponomarev, V. Yu., and Van Isacker, P.
Abstract: The lifetime of the 2(1)(+) state of Po-212 was measured in the Pb-208(C-12, Be-8)Po-212 transfer reaction by gamma-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 alpha-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 Po-212 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 Pb-210 and Po-210.
Published: 2017

42. A revised B(E2; 2(1)(+) -> 0(1)(+)) value in the semi-magic nucleus Po-210

Author: Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Astier, A., Altenkirch, R., Ansari, S., Braunroth, Th., Cortes, M. L., Dewald, A., Diel, F., Djongolov, M., Fransen, C., Gladnishki, K., Hennig, A., Karayonchev, V., Keatings, J. M., Kluge, E., Litzinger, J., Mueller-Gatermann, C., Petkov, P., Rudigier, M., Scheck, M., Scholz, Ph., Spagnoletti, P., Spieker, M., Stahl, C., Stegmann, R., Stoyanova, M., Thoele, P., Warr, N., Werner, V., Witt, W., Woelk, D., Zell, K. O., Van Isacker, P., Ponomarev, V. Yu., Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Astier, A., Altenkirch, R., Ansari, S., Braunroth, Th., Cortes, M. L., Dewald, A., Diel, F., Djongolov, M., Fransen, C., Gladnishki, K., Hennig, A., Karayonchev, V., Keatings, J. M., Kluge, E., Litzinger, J., Mueller-Gatermann, C., Petkov, P., Rudigier, M., Scheck, M., Scholz, Ph., Spagnoletti, P., Spieker, M., Stahl, C., Stegmann, R., Stoyanova, M., Thoele, P., Warr, N., Werner, V., Witt, W., Woelk, D., Zell, K. O., Van Isacker, P., and Ponomarev, V. Yu.
Abstract: The lifetimes of the 2(1)(+), the 2(2)(+) and the 3-1 states of Po-210 have been measured in the Pb-208(C-12, Be-10)Po-210 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 Po-210 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

43. Evolution of nuclear shapes in odd-mass yttrium and niobium isotopes from lifetime measurements following fission reactions

Author: Hagen, T. W., Görgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Ragnarsson, Ingemar, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, Valiente-Dobon, Jose Javier, Hagen, T. W., Görgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Ragnarsson, Ingemar, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, and Valiente-Dobon, Jose Javier
Abstract: Lifetimes of excited states in Y-99, Y-101, Nb-101, Nb-103, and Nb-105 were measured in an experiment using the recoil distance Doppler shift method at GANIL (Grand Accelerateur National dIons Lourds). The neutron-rich nuclei were produced in fission reactions between a U-238 beam and a Be-9 target. Prompt gamma rays were measured with the EXOGAM array and correlated with fission fragments that were identified in mass and atomic number with the VAMOS++ spectrometer. The measured lifetimes, together with branching ratios, provide B(M1) and B(E2) values for the strongly coupled rotational bands built on the [422] 5/2(+) ground state in the Y and Nb nuclei with neutron number N GT = 60. The comparison of the experimental results with triaxial particle-rotor calculations provides information about the evolution of the nuclear shape in this mass region.
Published: 2017

44. Evolution of nuclear shapes in odd-mass yttrium and niobium isotopes from lifetime measurements following fission reactions

Author: Hagen, T. W., Goergen, A., Korten, W., Grente, L., Salsac, M. -D., Farget, F., Ragnarsson, I., 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., Goergen, A., Korten, W., Grente, L., Salsac, M. -D., Farget, F., Ragnarsson, I., 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 Y-99, Y-101, Nb-101, Nb-103, and Nb-105 were measured in an experiment using the recoil distance Doppler shift method at GANIL (Grand Accelerateur National d'Ions Lourds). The neutron-rich nuclei were produced in fission reactions between a U-238 beam and a Be-9 target. Prompt gamma rays were measured with the EXOGAM array and correlated with fission fragments that were identified in mass and atomic number with the VAMOS++ spectrometer. The measured lifetimes, together with branching ratios, provide B(M1) and B(E2) values for the strongly coupled rotational bands built on the [422] 5/2(+) ground state in the Y and Nb nuclei with neutron number N >= 60. The comparison of the experimental results with triaxial particle-rotor calculations provides information about the evolution of the nuclear shape in this mass region.
Published: 2017

45. Enhanced collectivity along the N = Z line: Lifetime measurements in Ti-44, Cr-48, and Fe-52

Author: Arnswald, K., Braunroth, T., Seidlitz, M., Coraggio, L., Reiter, P., Birkenbach, B., Blazhev, A., Dewald, A., Fransen, C., Fu, B., Gargano, A., Hess, H., Hirsch, R., Itaco, N., Lenzi, S. M., Lewandowski, L., Litzinger, J., Mueller-Gatermann, C., Queiser, M., Rosiak, D., Schneiders, D., Siebeck, B., Steinbach, T., Vogt, A., Wolf, K., Zell, K. O., Arnswald, K., Braunroth, T., Seidlitz, M., Coraggio, L., Reiter, P., Birkenbach, B., Blazhev, A., Dewald, A., Fransen, C., Fu, B., Gargano, A., Hess, H., Hirsch, R., Itaco, N., Lenzi, S. M., Lewandowski, L., Litzinger, J., Mueller-Gatermann, C., Queiser, M., Rosiak, D., Schneiders, D., Siebeck, B., Steinbach, T., Vogt, A., Wolf, K., and Zell, K. O.
Abstract: Lifetimes of the 2(1)(+) states in Ti-44, Cr-48,Cr-50, and Fe-52 were determined with high accuracy exploiting the recoil distance Doppler-shift method. The reduced E2 transition strengths of Ti-44 and Fe-52 differ considerably from previously known values. A systematic increase in collectivity is found for the N = Z nuclei compared to neighboring isotopes. The B(E2) values along the Ti, Cr, and Fe isotopic chains are compared to shell-model calculations employing established interactions for the 0 f 1p shell, as well as a novel effective shell-model Hamiltonian starting from a realistic nucleon-nucleon potential. The theoretical approaches underestimate the B(E2) values for the lower-mass Ti isotopes. Strong indication is found for particle-hole cross-shell configurations, recently corroborated by similar results for the neighboring isotone Ca-42. (C) 2017 The Author(s). Published by Elsevier B.V.
Published: 2017

46. A revised B(E2; 2(1)(+) -> 0(1)(+)) value in the semi-magic nucleus Po-210

Author: Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Astier, A., Altenkirch, R., Ansari, S., Braunroth, Th., Cortes, M. L., Dewald, A., Diel, F., Djongolov, M., Fransen, C., Gladnishki, K., Hennig, A., Karayonchev, V., Keatings, J. M., Kluge, E., Litzinger, J., Mueller-Gatermann, C., Petkov, P., Rudigier, M., Scheck, M., Scholz, Ph., Spagnoletti, P., Spieker, M., Stahl, C., Stegmann, R., Stoyanova, M., Thoele, P., Warr, N., Werner, V., Witt, W., Woelk, D., Zell, K. O., Van Isacker, P., Ponomarev, V. Yu., Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Astier, A., Altenkirch, R., Ansari, S., Braunroth, Th., Cortes, M. L., Dewald, A., Diel, F., Djongolov, M., Fransen, C., Gladnishki, K., Hennig, A., Karayonchev, V., Keatings, J. M., Kluge, E., Litzinger, J., Mueller-Gatermann, C., Petkov, P., Rudigier, M., Scheck, M., Scholz, Ph., Spagnoletti, P., Spieker, M., Stahl, C., Stegmann, R., Stoyanova, M., Thoele, P., Warr, N., Werner, V., Witt, W., Woelk, D., Zell, K. O., Van Isacker, P., and Ponomarev, V. Yu.
Abstract: The lifetimes of the 2(1)(+), the 2(2)(+) and the 3-1 states of Po-210 have been measured in the Pb-208(C-12, Be-10)Po-210 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 Po-210 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

47. Low collectivity of the 2(1)(+) state of Po-212

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., Kroell, Th., Litzinger, J., Moschner, K., Mueller-Gatermann, C., Petkov, P., Scheck, M., Scholz, Ph., Schmidt, T., Spagnoletti, P., Stahl, C., Stegmann, R., Stolz, A., Vogt, A., Warr, N., Werner, V., Woelk, D., Zamora, J. C., Zell, K. O., Ponomarev, V. Yu., Van Isacker, P., 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., Kroell, Th., Litzinger, J., Moschner, K., Mueller-Gatermann, C., Petkov, P., Scheck, M., Scholz, Ph., Schmidt, T., Spagnoletti, P., Stahl, C., Stegmann, R., Stolz, A., Vogt, A., Warr, N., Werner, V., Woelk, D., Zamora, J. C., Zell, K. O., Ponomarev, V. Yu., and Van Isacker, P.
Abstract: The lifetime of the 2(1)(+) state of Po-212 was measured in the Pb-208(C-12, Be-8)Po-212 transfer reaction by gamma-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 alpha-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 Po-212 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 Pb-210 and Po-210.
Published: 2017

48. 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., Duchene, 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., Moeller, 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-Dobon, J. J., Vandone, V., Didierjean, F., Verney, D., Duchene, 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., Moeller, 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-Dobon, J. J., and Vandone, V.
Abstract: Background: While the N = 50 shell-gap evolution towards Ni-78 is presently in the focus of nuclear structure research, experimental information on the neutron effective single-particle energy sequence above the Ni-78 core remain scarce. Direct nucleon-exchange reactions are indeed difficult with presently available post-accelerated radioactive-ion beams (especially for high orbital-momentum orbitals) in this exotic region. Purpose: In this study we probe the evolution of the vlg(7/2)effective single-particle energy which is a key to understanding the possible evolution of the spin-orbit splitting due to the proton-neutron interaction in the Ni-78 region. To achieve this goal, a method based on lifetime measurements is used for the first time. The obtained lifetimes of the 7/2(1)(-) states in Kr-87 and Se-85 are used to investigate the vlg7/2 evolution. Method: Yrast and near-yrast states in the light N = 51 isotones Se-85 and Kr-87 were populated via multinucleon transfer reactions, using a Se-82 beam and a U-238 target at the LNL tandem-ALPI facility. The prompt y rays were detected by the AGATA Demonstrator and particle identification was performed using the PRISMA spectrometer. Lifetime measurements were performed by using the Cologne plunger device for deep inelastic reactions and the Recoil Distance Doppler Shift technique. Results: We obtain (tau(7/21+)) = 0.4(-0.4)(+1.6) ps for Kr-87. In the case of Se-85 an upper limit of 3(2) ps is obtained for the (tau(7/21+)) value. Conclusion: For Kr-87, the measured (7/2(1)(+)) lifetime is consistent with a core-coupled 2(+) circle times v2d(5/2) configuration for this state. This result is consistent with that obtained by direct reaction, which validates our method. For Se-85, the measured (7/2(1)(+)) lifetime limit indicates a very small contribution of the vlg(7/2) configuration to the wave function of this state.
Published: 2017

49. Evolution of nuclear shapes in odd-mass yttrium and niobium isotopes from lifetime measurements following fission reactions

Author: Hagen, T. W., Görgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Ragnarsson, Ingemar, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, Valiente-Dobon, Jose Javier, Hagen, T. W., Görgen, Andreas, Korten, Wolfram, Grente, Lucie, Salsac, Marie Delphine, Farget, Fanny, Ragnarsson, Ingemar, Braunroth, Thomas, Bruyneel, Bart, Čeliković, Igor T., Clement, Emmanuel, de France, Gilles, Delaune, Olivier, Dewald, Alfred, Dijon, A., Hackstein, Matthias, Jacquot, Bertrand, Litzinger, J., Ljungvall, Joa, Louchart, C., Michelagnoli, Caterina, Napoli, Daniel R., Recchia, Francesco, Rother, Wolfram, Sahin, Eda, Siem, Sunniva, Sulignano, Barbara, Theisen, Christophe, and Valiente-Dobon, Jose Javier
Abstract: Lifetimes of excited states in Y-99, Y-101, Nb-101, Nb-103, and Nb-105 were measured in an experiment using the recoil distance Doppler shift method at GANIL (Grand Accelerateur National dIons Lourds). The neutron-rich nuclei were produced in fission reactions between a U-238 beam and a Be-9 target. Prompt gamma rays were measured with the EXOGAM array and correlated with fission fragments that were identified in mass and atomic number with the VAMOS++ spectrometer. The measured lifetimes, together with branching ratios, provide B(M1) and B(E2) values for the strongly coupled rotational bands built on the [422] 5/2(+) ground state in the Y and Nb nuclei with neutron number N GT = 60. The comparison of the experimental results with triaxial particle-rotor calculations provides information about the evolution of the nuclear shape in this mass region.
Published: 2017

50. 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., Moeller, O., Mueller-Gatterman, C., Petkov, P., Napoli, D. R., Marginean, N., de Angelis, G., Ur, C. A., Bazzacco, D., Farnea, E., Lenzi, S. M., Vlastou, R., Balabanski, D., Konstantinopoulos, T., Ashley, S. F., Axiotis, M., Spyrou, A., Harissopulos, S., Dewald, A., Litzinger, J., Moeller, O., Mueller-Gatterman, C., Petkov, P., Napoli, D. R., Marginean, N., de Angelis, G., Ur, C. A., Bazzacco, D., Farnea, E., Lenzi, S. M., Vlastou, R., and Balabanski, D.
Abstract: 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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