Search

Your search keyword '"Gladnishki, K."' showing total 216 results
Start Over Author "Gladnishki, K."
216 results on '"Gladnishki, K."'

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

Author

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

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

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

Published
2017
Full Text
View/download PDF

3. Experimental study of the quadrupole collectivity of the low-lying states of 205Bi.

Author

Manov, V., Kocheva, D., Rainovski, G., Jolie, J., Beckers, M., Blazhev, A., Esmaylzadeh, A., Fransen, C., Gladnishki, K. A., and Spee, F.

Abstract

We present results from an experiment dedicated to measure the lifetimes of the low-lying excited states of 205Bi. This nucleus was studied in the one-proton transfer reaction 204Pb(16O,15N)205Bi and the lifetimes of the 11 / 2 1 - , 7 / 2 1 - , 5 / 2 1 - , 7 / 2 2 - states were determined by utilizing the Recoil Distance Doppler Shift method. Upon comparing the results with the expectations of the particle-core coupling model, it indicates a low quadrupole collectivity in the structure of these states. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

4. Search for one-phonon mixed-symmetry states in the radioactive nucleus ¹⁴⁰Nd

Author

Gladnishki, K. A., Rainovski, G., Petkov, P., Jolie, J., Pietralla, N., Blazhev, A., Damyanova, A., Danchev, M., Dewald, A., Fransen, C., Hackstein, M., Möller, O., Pissulla, T., Reese, M., Rother, W., Gladnishki, K. A., Rainovski, G., Petkov, P., Jolie, J., Pietralla, N., Blazhev, A., Damyanova, A., Danchev, M., Dewald, A., Fransen, C., Hackstein, M., Möller, O., Pissulla, T., Reese, M., and Rother, W.

Abstract

Low-spin excited states of ¹⁴⁰Nd have been studied via the ¹⁴⁰Ce(³He,3n)¹⁴⁰Nd reaction. The results from the data analysis show that one of the candidates for the one-phonon mixed symmetry state of ¹⁴⁰Nd, namely the 2⁺₃ state at 2140 keV with an effective lifetime of 220(90) fs, decay with a fast M1 transition to the 2⁺₁ state. Therefore consequently this state can be treated as, at least a fragment of the one-phonon MSS of ¹⁴⁰Nd. This is the first example where mixed symmetry character is tentatively assigned to a state of an unstable nucleus from the mass A ≈ 140 region based on the data on absolute M1 transition rates.

Published
2024

5. One-phonon isovector 2⁺₁,MS state in the neutron rich nucleus ¹³²Te

Author

Danchev, M., Rainovski, G., Pietralla, N., Gargano, A., Covello, A., Baktash, C., Beene, J. R., Bingham, C. R., Galindo-Uribarri, A., Gladnishki, K. A., Gross, C. J., Ponomarev, V. Yu, Radford, D. C., Riedinger, L. L., Scheck, M., Stuchbery, A. E., Wambach, J., Yu, C.-H., Zamfir, N. V., Danchev, M., Rainovski, G., Pietralla, N., Gargano, A., Covello, A., Baktash, C., Beene, J. R., Bingham, C. R., Galindo-Uribarri, A., Gladnishki, K. A., Gross, C. J., Ponomarev, V. Yu, Radford, D. C., Riedinger, L. L., Scheck, M., Stuchbery, A. E., Wambach, J., Yu, C.-H., and Zamfir, N. V.

Abstract

The 2⁺₂ state in ¹³²Te is identified as the one-phonon MSS in a projectile Coulomb excitation experiment presenting a firm example of a MSS in unstable, neutron rich nuclei. The results of shell-model calculations based on the low-momentum interaction Vlow-k are in good agreement with experiment demonstrating the ability of the effective shell-model interaction to produce states of mixed-symmetry character.

Published
2024

6. On the origin of low-lying M1 strength in even-even nuclei

Author

Rainovski, G., Danchev, M., Pietralla, N., Gargano, A., Covello, A., Baktash, C., Beene, J. R., Bingham, C. R., Galindo-Uribarri, A., Gladnishki, K. A., Gross, C. J., Ponomarev, V. Yu, Radford, D. C., Riedinger, L. L., Scheck, M., Stuchbery, A. E., Wambach, J., Yu, C.-H., Zamfir, N. V., Rainovski, G., Danchev, M., Pietralla, N., Gargano, A., Covello, A., Baktash, C., Beene, J. R., Bingham, C. R., Galindo-Uribarri, A., Gladnishki, K. A., Gross, C. J., Ponomarev, V. Yu, Radford, D. C., Riedinger, L. L., Scheck, M., Stuchbery, A. E., Wambach, J., Yu, C.-H., and Zamfir, N. V.

Abstract

The 2⁺₂ state in ¹³²Te is identified as the one-phonon MSS in a projectile Coulomb excitation experiment presenting a firm example of a MSS in unstable, neutron rich nuclei. The results of shell-model calculations based on the low-momentum interaction Vlow−k are in good agreement with experiment demonstrating, the ability of the effective shell-model interaction to produce states of mixed symmetry character.

Published
2024

7. 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

8. Coulomb excitation of 73Ga

Author

Diriken, J., Stefanescu, I., Balabanski, D., Blasi, N., Blazhev, A., Bree, N., Cederkäll, J., Cocolios, T. E., Davinson, T., Eberth, J., Ekström, A., Fedorov, D. V., Fedosseev, V. N., Fraile, L. M., Franchoo, S., Georgiev, G., Gladnishki, K., Huyse, M., Ivanov, O. V., Ivanov, V. S., Iwanicki, J., Jolie, J., Konstantinopoulos, T., Kröll, Th., Krücken, R., Köster, U., Lagoyannis, A., Bianco, G. Lo, Maierbeck, P., Marsh, B. A., Napiorkowski, P., Patronis, N., Pauwels, D., Reiter, P., Seliverstov, M., Sletten, G., Van de Walle, J., Van Duppen, P., Voulot, D., Walters, W. B., Warr, N., Wenander, F., and Wrzosek, K.

Subjects
Nuclear Experiment
Abstract

The B(E2; Ii -> If) values for transitions in 71Ga and 73Ga were deduced from a Coulomb excitation experiment at the safe energy of 2.95 MeV/nucleon using post-accelerated beams of 71,73Ga at the REX-ISOLDE on-line isotope mass separator facility. The emitted gamma rays were detected by the MINIBALL-detector array and B(E2; Ii->If) values were obtained from the yields normalized to the known strength of the 2+ -> 0+ transition in the 120Sn target. The comparison of these new results with the data of less neutron-rich gallium isotopes shows a shift of the E2 collectivity towards lower excitation energy when adding neutrons beyond N = 40. This supports conclusions from previous studies of the gallium isotopes which indicated a structural change in this isotopical chain between N = 40 and N = 42. Combined with recent measurements from collinear laser spectroscopy showing a 1/2- spin and parity for the ground state, the extracted results revealed evidence for a 1/2-; 3/2- doublet near the ground state in 73 31Ga42 differing by at most 0.8 keV in energy.

Published
2010
Full Text
View/download PDF

9. Coulomb excitation of $^{68}$Ni at safe energies

Author

Bree, N., Stefanescu, I., Butler, P. A., Cederkäll, J., Davinson, T., Delahaye, P., Eberth, J., Fedorov, D., Fedosseev, V. N., Fraile, L. M., Franchoo, S., Georgiev, G., Gladnishki, K., Huyse, M., Ivanov, O., Iwanicki, J., Jolie, J., Köster, U., Kröll, Th., Krücken, R., Marsh, B. A., Niedermaier, O., Reiter, P., Scheit, H., Schwalm, D., Sieber, T., Van de Walle, J., Van Duppen, P., Warr, N., Weisshaar, D., Wenander, F., and Zemlyanoy, S.

Subjects
Nuclear Experiment
Abstract

The $B(E2;0^+\to2^+)$ value in $^{68}$Ni has been measured using Coulomb excitation at safe energies. The $^{68}$Ni radioactive beam was post-accelerated at the ISOLDE facility (CERN) to 2.9 MeV/u. The emitted $\gamma$ rays were detected by the MINIBALL detector array. A kinematic particle reconstruction was performed in order to increase the measured c.m. angular range of the excitation cross section. The obtained value of 2.8$^{+1.2}_{-1.0}$ 10$^2$ e$^2$fm$^4$ is in good agreement with the value measured at intermediate energy Coulomb excitation, confirming the low $0^+\to2^+$ transition probability., Comment: 4 pages, 5 figures

Published
2008
Full Text
View/download PDF

10. Experimental evidence for low-lying quadrupole isovector excitation of 208Po

Author

Yaneva, A., Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Dewald, A., Djongolov, M., Fransen, C., Gladnishki, K. A., Henrich, C., Homm, I., Ide, K. E., John, P. R., Kalaydjieva, D., Karayonchev, V., Kern, R., Kleemann, J., Kröll, Th., Müller-Gatermann, C., Scheck, M., Spagnoletti, P., Stoyanova, M., and Werner, V.

Published
2020
Full Text
View/download PDF

11. Benchmarking the PreSPEC@GSI experiment for Coulex-multipolarimetry on the π(p3/2)→π(p1/2)85Br spin-flip transition in π(p3/2)→π(p1/2)85Br

Author

Napiralla, P., Lettmann, M., Stahl, C., Rainovski, G., Pietralla, N., Afara, S., Ameil, F., Arici, T., Aydin, S., Barrientos, D., Bednarczyk, P., Bentley, M. A., Benzoni, G., Birkenbach, B., Blazhev, A., Boston, A. J., Boutachkov, P., Bracco, A., Bruyneel, B., Clément, E., Cortés, M. L., Crespi, F. C. L., Cullen, D. M., Curien, D., Désesquelles, P., Didierjean, F., Domingo-Pardo, C., Duchêne, G., Eberth, J., Egger, H., Fahlander, C., Gerl, J., Gladnishki, K. A., Golubev, P., González, V., Górska, M., Gottardo, A., Grassi, L., Habermann, T., Harkness-Brennan, L. J., Hess, H., Jenkins, D. G., John, P. R., Jolie, J., Judson, D. S., Kojouharov, I., Korten, W., Labiche, M., Lalović, N., Lizarazo, C., Louchart-Henning, C., Maj, A., Menegazzo, R., Mengoni, D., Merchan, E., Million, B., Möller, O., Möller, T., Moschner, K., Modamio, V., Napoli, D., Singh, B. S. Nara, Podolyák, Zs., Pietri, S., Ralet, D., Reese, M., Reiter, P., Rudolph, D., Sanchis, E., Sarmiento, L. G., Schaffner, H., Simpson, J., Singh, P. P., Valiente-Dobón, J. J., Werner, V., and Wieland, O.

Published
2020
Full Text
View/download PDF

12. X-ray– γ fast-timing lifetime measurement of the 61+ state in Po206

Author

Stoychev, K., primary, Djongolov, M., additional, Karayonchev, V., additional, Rainovski, G., additional, Ley, M., additional, Jolie, J., additional, Bittner, D., additional, Blazhev, A., additional, Dunkel, F., additional, Esmaylzadeh, A., additional, Fransen, C., additional, Garbe, J., additional, Gerhard, L. M., additional, Gerst, R.-B., additional, Geusen, K., additional, Gladnishki, K. A., additional, Häfner, G., additional, Kalaydjieva, D., additional, Klöckner, L., additional, Knafla, L., additional, Kocheva, D., additional, Kornwebel, L., additional, Müller-Gatermann, C., additional, Nikodem, E., additional, Régis, J.-M., additional, Schomacker, K., additional, and Stoyanova, M., additional

Published
2023
Full Text
View/download PDF

13. New evidence for alpha clustering structure in the ground state band of Po

Author

von Tresckow, Ma., Rudigier, M., Shneidman, T.M., Kröll, Th., Boromiza, M., Clisu, C., Costache, C., Filipescu, D., Florea, N.M., Gheorghe, I., Gladnishki, K., Ionescu, A., Kocheva, D., Lică, R., Mărginean, N., Mărginean, R., Mashtakov, K.R., Mihai, C., Mihai, R.E., Negret, A., Nita, C.R., Olacel, A., Oprea, A., Pascu, S., Rainovski, G., Sava, T., Scheck, M., Spagnoletti, P., Sotty, C., Stan, L., Stiru, I., Toma, S., Turturică, A., and Ujeniuc, S.

Abstract

Half-lives of the low-lying yrast states of $^{212}$Po have been measured using the delayed coincidence fast-timing method. We report on the first measurement of the 41+ half-life, as well as a new measurement of the 61+ half-life with improved accuracy compared to previous studies. The extracted lifetime of the 41+ and 61+ state have been determined to be 100(14) ps and 1.66(28) ns respectively. With these measurements, precise values are now available for the reduced transition strengths B(E2) of all ground state band levels in $^{212}$Po up to the first 8+ state, in particular B(E2; 41+→21+) = 9.4(13) W.u. and B(E2;61+→41+) = 8.7(15) W.u. Comparison of the new available data with an α-clustering model calculation provides evidence that the inclusion of the α-cluster degree of freedom significantly improves agreement with experimental data compared to earlier shell model calculations.

Published
2021

14. Magnetic moment of the 11/2 − isomeric state in 99 Mo and neutron spin g factor quenching in A∼100 nuclei

Author

Daugas, J.M., Rosse, B., Balabanski, D.L., Bucurescu, D., Kisyov, S., Regan, P.H., Georgiev, G., Gaudefroy, L., Gladnishki, K., Méot, V., Morel, P., Pietri, S., Roig, O., Simpson, G.S., DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Paris Saclay, Extreme Light Infrastruture - Nuclear Physics (ELI-NP), National Institut for Nuclear Physics and Engineering (IFIN HH), National Institut for Nuclear Physics and Engineering, Romanian Academy, Department of Physics, University of Surrey, University of Surrey (UNIS), National Physical Laboratory [Teddington] (NPL), Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France, Faculty of Physics, Sofia University saint Kliment Ohridski, Helmholtz Centre for Heavy Ion Research (GSI), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Sofia University 'St. Kliment Ohridski'

Subjects
[PHYS]Physics [physics]
Abstract

International audience; The gyromagnetic factor of the low-lying Ex=684.10(19)keV isomeric state of the nucleus 99Mo was measured using the time-dependent perturbed angular distribution technique. This level is assigned a spin and parity of Jπ=11/2−, with a half-life of T1/2=742(13)ns. The state of interest was populated and spin-aligned via a single-neutron transfer on a highly enriched 98Mo target. A magnetic moment μexpt.=−0.627(20)μN was obtained. This result is far from the Schmidt value expected for a pure single-particle νh11/2 state. A comparison of experimental spectroscopic properties of this nucleus is made with results of multishell Interacting boson-fermion Model (IBFM-1) calculations. In this approach, the Jπ=11/2− isomeric state in 99Mo has a pure νh11/2 configuration. Its magnetic moment, as well as that of other two excited states could be reasonably well reproduced by reducing the free neutron spin g factor with a quenching factor of 0.45. This low value is not appropriate only for this case, similar values for the quenching factor being also required in order to describe magnetic moments in other nuclei from the same mass region

Published
2021
Full Text
View/download PDF

15. New evidence for alpha clustering structure in the ground state band of 212Po

Author

von Tresckow, Ma., primary, Rudigier, M., additional, Shneidman, T.M., additional, Kröll, Th., additional, Boromiza, M., additional, Clisu, C., additional, Costache, C., additional, Filipescu, D., additional, Florea, N.M., additional, Gheorghe, I., additional, Gladnishki, K., additional, Ionescu, A., additional, Kocheva, D., additional, Lică, R., additional, Mărginean, N., additional, Mărginean, R., additional, Mashtakov, K.R., additional, Mihai, C., additional, Mihai, R.E., additional, Negret, A., additional, Nita, C.R., additional, Olacel, A., additional, Oprea, A., additional, Pascu, S., additional, Rainovski, G., additional, Sava, T., additional, Scheck, M., additional, Spagnoletti, P., additional, Sotty, C., additional, Stan, L., additional, Stiru, I., additional, Toma, S., additional, Turturică, A., additional, and Ujeniuc, S., additional

Published
2021
Full Text
View/download PDF

16. Magnetic moment of the 11/2− isomeric state in Mo99 and neutron spin g factor quenching in A≈100 nuclei

Author

Daugas, J. M., primary, Rosse, B., additional, Balabanski, D. L., additional, Bucurescu, D., additional, Kisyov, S., additional, Regan, P. H., additional, Georgiev, G., additional, Gaudefroy, L., additional, Gladnishki, K., additional, Méot, V., additional, Morel, P., additional, Pietri, S., additional, Roig, O., additional, and Simpson, G. S., additional

Published
2021
Full Text
View/download PDF

17. Microscopic structure of the one-phonon 2+ states of Po208

Author

Kalaydjieva, D., primary, Kocheva, D., additional, Rainovski, G., additional, Karayonchev, V., additional, Jolie, J., additional, Pietralla, N., additional, Beckers, M., additional, Blazhev, A., additional, Dewald, A., additional, Djongolov, M., additional, Esmaylzadeh, A., additional, Fransen, C., additional, Gladnishki, K. A., additional, Goldkuhle, A., additional, Henrich, C., additional, Homm, I., additional, Ide, K. E., additional, John, P. R., additional, Kern, R., additional, Kleemann, J., additional, Kröll, Th., additional, Müller-Gatermann, C., additional, Scheck, M., additional, Spagnoletti, P., additional, Stoyanova, M., additional, Stoychev, K., additional, Werner, V., additional, Yaneva, A., additional, Dimitrova, S. S., additional, De Gregorio, G., additional, Naïdja, H., additional, and Gargano, A., additional

Published
2021
Full Text
View/download PDF

18. In-beam measurements of sub-nanosecond nuclear lifetimes with a mixed array of HPGe and LaBr3:Ce detectors

Author

Mărginean, N., Balabanski, D. L., Bucurescu, D., Lalkovski, S., Atanasova, L., Căta-Danil, G., Căta-Danil, I., Daugas, J. M., Deleanu, D., Detistov, P., Deyanova, G., Filipescu, D., Georgiev, G., Ghiţă, D., Gladnishki, K. A., Lozeva, R., Glodariu, T., Ivaşcu, M., Kisyov, S., Mihai, C., Mărginean, R., Negret, A., Pascu, S., Radulov, D., Sava, T., Stroe, L., Suliman, G., and Zamfir, N. V.

Published
2010
Full Text
View/download PDF

19. Spin-alignment and g-factor measurement of the $I^{\pi}$ = 12+ isomer in 192Pb produced in the relativistic-energy fragmentation of a 238U beam

Author

Kmiecik, M., Maj, A., Gerl, J., Neyens, G., Atanasova, L., Balabanski, D. L., Becker, F., Bednarczyk, P., Benzoni, G., Blasi, N., Bracco, A., Brambilla, S., Caceres, L., Camera, F., Ciemała, M., Crespi, F. C. L., Chamoli, S. K., Chmel, S., Daugas, J. M., Detistov, P., Doornenbal, P., Georgiev, G., Gladnishki, K., Górska, M., Grawe, H., Grȩbosz, J., Hass, M., Hoischen, R., Ilie, G., Ionescu-Bujor, M., Jolie, J., Kojuharov, I., Krasznahorkay, A., Kulessa, R., Lach, M., Lakshmi, S., Leoni, S., Lo Bianco, G., Lozeva, R., Maier, K. H., Mallion, S., Mazurek, K., Mȩczyński, W., Million, B., Montanari, D., Myalski, S., Petrache, C., Pfützner, M., Pietri, S., Podolyák, Zs., Prokopowicz, W., Rudolph, D., Saito, N., Saito, T. R., Saltarelli, A., Simpson, G. S., Styczeń, J., Vermeulen, N., Werner-Malento, E., Wieland, O., Wollersheim, H. J., and Ziȩbliński, M.

Published
2010
Full Text
View/download PDF

20. Restoring the valence-shell stabilization in 140 Nd

Author

Kern, R., Zidarova, R., Pietralla, N., Rainovski, G., Stegmann, R., Blazhev, A., Boukhari, A., Cederkäll, J., Cubiss, J. G., Djongolov, M., Fransen, C., Gaffney, L. P., Gladnishki, K., Giannopoulos, E., Hess, H., Jolie, J., Karayonchev, V., Kaya, L., Keatings, J. M., Kocheva, D., Kröll, Th., Möller, O., O'Neill, G. G., Pakarinen, J., Reiter, P., Rosiak, D., Scheck, M., Snall, J., Söderström, P.-A., Spagnoletti, P., Stoyanova, M., Thiel, S., Vogt, A., Warr, N., Welker, A., Werner, V., Wiederhold, J., and De Witte, H.

Published
2020

21. Microscopic structure of the one-phonon 2(+) states of Po-208

Author

Kalaydjieva, D., Kocheva, D., Rainovski, G., Karayonchev, V, Jolie, J., Pietralla, N., Beckers, M., Blazhev, A., Dewald, A., Djongolov, M., Esmaylzadeh, A., Fransen, C., Gladnishki, K. A., Goldkuhle, A., Henrich, C., Homm, I, Ide, K. E., John, P. R., Kern, R., Kleemann, J., Kroell, Th, Muller-Gatermann, C., Scheck, M., Spagnoletti, P., Stoyanova, M., Stoychev, K., Werner, V, Yaneva, A., Dimitrova, S. S., De Gregorio, G., Naidja, H., Gargano, A., Kalaydjieva, D., Kocheva, D., Rainovski, G., Karayonchev, V, Jolie, J., Pietralla, N., Beckers, M., Blazhev, A., Dewald, A., Djongolov, M., Esmaylzadeh, A., Fransen, C., Gladnishki, K. A., Goldkuhle, A., Henrich, C., Homm, I, Ide, K. E., John, P. R., Kern, R., Kleemann, J., Kroell, Th, Muller-Gatermann, C., Scheck, M., Spagnoletti, P., Stoyanova, M., Stoychev, K., Werner, V, Yaneva, A., Dimitrova, S. S., De Gregorio, G., Naidja, H., and Gargano, A.

Abstract

The lifetimes of the 2(1)(+) and 4(1)(+) states of Po-208 were measured in the a-transfer reaction Pb-204(C-12, Be-8) Po-208 by gamma-ray spectroscopy utilizing the recoil distance Doppler shift method. The newly extracted transition strengths alongside ones of the decay of the 2(2)(+) state were compared to the results of large-scale shell-model calculations using an effective interaction derived from the realistic CD-Bonn nucleon-nucleon potential. The comparison indicates the importance of the quadrupole isovector excitations in the valence shell for a fine tuning of the two-body matrix elements of the shell-model interaction.

Published
2021

22. Lifetimes and structures of low-lying negative-parity states of Po-209

Author

Karayonchev, V, Stoyanova, M., Rainovski, G., Jolie, J., Blazhev, A., Djongolov, M., Esmaylzadeh, A., Fransen, C., Gladnishki, K., Knafla, L., Kocheva, D., Kornwebel, L., Regis, J-M, De Gregorio, G., Gargano, A., Karayonchev, V, Stoyanova, M., Rainovski, G., Jolie, J., Blazhev, A., Djongolov, M., Esmaylzadeh, A., Fransen, C., Gladnishki, K., Knafla, L., Kocheva, D., Kornwebel, L., Regis, J-M, De Gregorio, G., and Gargano, A.

Abstract

The 5/2(1)(-), 9/2(1)(-), and 11 /2(1)(-) states in Po-209 were populated in the beta decay of At-209 and their lifetimes measured using the electronic gamma-gamma fast timing technique. The lifetime of the 9/2(1)(-) state is measured for first time. The lifetime of the 5/2(1)(-) is measured to be shorter than the value adopted in the literature while the lifetime of the 11/2(1)(-) state agrees well with the previous measurement. In order to get deeper insight into the structure of the states, a shell-model calculation was carried out adopting a microscopic effective interaction derived from the realistic CD-Bonn potential. The comparison between theoretical and experimental data for the low-lying negative-parity states of Po-209 supports the reliability of the predicted wave functions, which are found to be dominated by the coupling of a neutron hole to the yrast states of Po-210. However, it also points to the important role played by minor wave-function components in describing the reduced electromagnetic strengths, suggesting the need of additional configuration mixing for achieving a better quantitative agreement.

Published
2021

23. Lifetimes and structures of low-lying negative-parity states of Po209

Author

Karayonchev, V., primary, Stoyanova, M., additional, Rainovski, G., additional, Jolie, J., additional, Blazhev, A., additional, Djongolov, M., additional, Esmaylzadeh, A., additional, Fransen, C., additional, Gladnishki, K., additional, Knafla, L., additional, Kocheva, D., additional, Kornwebel, L., additional, Régis, J.-M., additional, De Gregorio, G., additional, and Gargano, A., additional

Published
2021
Full Text
View/download PDF

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

Author

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

Subjects
Physics, QC1-999
Abstract

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

Published
2016
Full Text
View/download PDF

25. Restoring the valence-shell stabilization in Nd140

Author

Kern, R., primary, Zidarova, R., additional, Pietralla, N., additional, Rainovski, G., additional, Stegmann, R., additional, Blazhev, A., additional, Boukhari, A., additional, Cederkäll, J., additional, Cubiss, J. G., additional, Djongolov, M., additional, Fransen, C., additional, Gaffney, L. P., additional, Gladnishki, K., additional, Giannopoulos, E., additional, Hess, H., additional, Jolie, J., additional, Karayonchev, V., additional, Kaya, L., additional, Keatings, J. M., additional, Kocheva, D., additional, Kröll, Th., additional, Möller, O., additional, O'Neill, G. G., additional, Pakarinen, J., additional, Reiter, P., additional, Rosiak, D., additional, Scheck, M., additional, Snall, J., additional, Söderström, P.-A., additional, Spagnoletti, P., additional, Stoyanova, M., additional, Thiel, S., additional, Vogt, A., additional, Warr, N., additional, Welker, A., additional, Werner, V., additional, Wiederhold, J., additional, and De Witte, H., additional

Published
2020
Full Text
View/download PDF

26. Experimental evidence for low-lying quadrupole isovector excitation of $$^{208}$$Po

Author

Yaneva, A., primary, Kocheva, D., additional, Rainovski, G., additional, Jolie, J., additional, Pietralla, N., additional, Blazhev, A., additional, Dewald, A., additional, Djongolov, M., additional, Fransen, C., additional, Gladnishki, K. A., additional, Henrich, C., additional, Homm, I., additional, Ide, K. E., additional, John, P. R., additional, Kalaydjieva, D., additional, Karayonchev, V., additional, Kern, R., additional, Kleemann, J., additional, Kröll, Th., additional, Müller-Gatermann, C., additional, Scheck, M., additional, Spagnoletti, P., additional, Stoyanova, M., additional, and Werner, V., additional

Published
2020
Full Text
View/download PDF

27. Evolution of the structure of the ${4}_{1}^{+}$ states in Po isotopes

Author

Stoyanova, M., primary, Karayonchev, V., additional, Rainovski, G., additional, Jolie, J., additional, Pietralla, N., additional, Blazhev, A., additional, Dewald, A., additional, Djongolov, M., additional, Esmaylzadeh, A., additional, Fransen, C., additional, Garbe, J., additional, Gerhard, L., additional, Gladnishki, K. A., additional, Ide, K., additional, John, P. R., additional, Kern, R., additional, Kleemann, J., additional, Kocheva, D., additional, Kröll, Th., additional, Müller-Gatermann, C., additional, Régis, J.-M., additional, Spagnoletti, P., additional, Werner, V., additional, and Yaneva, A., additional

Published
2020
Full Text
View/download PDF

28. Benchmarking the PreSPEC@GSI experiment for Coulex-multipolarimetry on the $$\pi (p_{3/2})\rightarrow \pi (p_{1/2})$$ spin-flip transition in $$^{85}\hbox {Br}$$

Author

Napiralla, P., primary, Lettmann, M., additional, Stahl, C., additional, Rainovski, G., additional, Pietralla, N., additional, Afara, S., additional, Ameil, F., additional, Arici, T., additional, Aydin, S., additional, Barrientos, D., additional, Bednarczyk, P., additional, Bentley, M. A., additional, Benzoni, G., additional, Birkenbach, B., additional, Blazhev, A., additional, Boston, A. J., additional, Boutachkov, P., additional, Bracco, A., additional, Bruyneel, B., additional, Clément, E., additional, Cortés, M. L., additional, Crespi, F. C. L., additional, Cullen, D. M., additional, Curien, D., additional, Désesquelles, P., additional, Didierjean, F., additional, Domingo-Pardo, C., additional, Duchêne, G., additional, Eberth, J., additional, Egger, H., additional, Fahlander, C., additional, Gerl, J., additional, Gladnishki, K. A., additional, Golubev, P., additional, González, V., additional, Górska, M., additional, Gottardo, A., additional, Grassi, L., additional, Habermann, T., additional, Harkness-Brennan, L. J., additional, Hess, H., additional, Jenkins, D. G., additional, John, P. R., additional, Jolie, J., additional, Judson, D. S., additional, Kojouharov, I., additional, Korten, W., additional, Labiche, M., additional, Lalović, N., additional, Lizarazo, C., additional, Louchart-Henning, C., additional, Maj, A., additional, Menegazzo, R., additional, Mengoni, D., additional, Merchan, E., additional, Million, B., additional, Möller, O., additional, Möller, T., additional, Moschner, K., additional, Modamio, V., additional, Napoli, D., additional, Singh, B. S. Nara, additional, Podolyák, Zs., additional, Pietri, S., additional, Ralet, D., additional, Reese, M., additional, Reiter, P., additional, Rudolph, D., additional, Sanchis, E., additional, Sarmiento, L. G., additional, Schaffner, H., additional, Simpson, J., additional, Singh, P. P., additional, Valiente-Dobón, J. J., additional, Werner, V., additional, and Wieland, O., additional

Published
2020
Full Text
View/download PDF

29. Lifetime measurements of the low-lying excited states of 208Po

Author

Kocheva, D., primary, Yaneva, A., additional, Kalaydjieva, D., additional, Rainovski, G., additional, Jolie, J., additional, Pietralla, N., additional, Beckers, M., additional, Blazhev, A., additional, Bussmann, L., additional, Cappellazzo, M., additional, Dewald, A., additional, Diel, F., additional, Djongolov, M., additional, Dunkel, F., additional, Esmaylzadeh, A., additional, Falk, B., additional, Fransen, C., additional, Garbe, J., additional, Gerhard, L., additional, Gerst, R.-B., additional, Gladnishki, K. A., additional, Goldkuhle, A., additional, Hackenberg, G., additional, Henrich, C., additional, Homm, I., additional, Ide, K., additional, Karayonchev, V., additional, Kern, R., additional, Kleeman, J., additional, Knafla, L., additional, Kornwebel, L., additional, Kröll, Th., additional, Ley, M., additional, Müller-Gatermann, C., additional, Scheck, M., additional, Schmidt, T., additional, Spagnoletti, P., additional, Stoyanova, M., additional, and Werner, V., additional

Published
2020
Full Text
View/download PDF

30. Benchmarking the PreSPEC@GSI experiment for Coulex-multipolarimetry on the π(p3 / 2) → π(p1 / 2) spin-flip transition in 85Br

Author

Napiralla, P., Lettmann, M., Stahl, C., Rainovski, G., Pietralla, N., Afara, S., Ameil, F., Arici, T., Aydin, S., Barrientos, D., Bednarczyk, P., Bentley, M. A., Benzoni, G., Birkenbach, B., Blazhev, A., Boston, A. J., Boutachkov, P., Bracco, A., Bruyneel, B., Clément, E., Cortés, M. L., Crespi, F. C. L., Cullen, D. M., Curien, D., Désesquelles, P., Didierjean, F., Domingo-Pardo, C., Duchêne, G., Eberth, J., Egger, H., Fahlander, C., Gerl, J., Gladnishki, K. A., Golubev, P., González, V., Górska, M., Gottardo, A., Grassi, L., Habermann, T., Harkness-Brennan, L. J., Hess, H., Jenkins, D. G., John, P. R., Jolie, J., Judson, D. S., Kojouharov, I., Korten, W., Labiche, M., Lalović, N., Lizarazo, C., Louchart-Henning, C., Maj, A., Menegazzo, R., Mengoni, D., Merchan, E., Million, B., Möller, O., Möller, T., Moschner, K., Modamio, V., Napoli, D., Singh, B. S. Nara, Podolyak, Zs., Pietri, S., Ralet, D., Reese, M., Reiter, P., Rudolph, D., Sanchis, E., Sarmiento, L. G., Schaffner, H., Simpson, J., Singh, P. P., Valiente-Dobón, J. J., Werner, V., and Wieland, O.

Abstract

A first performance test of the Coulomb excitation multipolarimetry (Coulex-multipolarimetry) method is presented. It is based on a 85Br π(p3/2) → π(p1/2) spin-flip experiment performed as part of the PreSPEC-AGATA campaign at the GSI Helmholtzzentrum für Schwerionenforschung (GSI). Via determination of background levels around the expected 85Br excitations as well as measured 197Au excitations, an upper limit for the M1 transition strength of the 1/2⁻₁ → 3/2⁻g.s. transition in 85Br and a lower beam time limit for upcoming experimental campaigns utilizing Coulex-multipolarimetry have been inferred. The impact of the use of AGATA in its anticipated 1π configuration on these estimates is deduced via Geant4 simulations.

Published
2020

31. Restoring the valence-shell stabilization in 140Nd

Author

Kern, R, Zidarova, R, Pietralla, N, Rainovski, G, Stegmann, R, Blazhev, A, Boukhari, A, Cederkäll, J, Cubiss, J G, Djongolov, M, Fransen, C, Gaffney, L P, Gladnishki, K, Giannopoulos, E, Hess, H, Jolie, J, Karayonchev, V, Kaya, L, Keatings, J M, Kocheva, D, Kröll, Th, Möller, O, O'Neill, G G, Pakarinen, J, Reiter, P, Rosiak, D, Scheck, M, Snall, J, Söderström, P A, Spagnoletti, P, Stoyanova, M, Thiel, S, Vogt, A, Warr, N, Welker, A, Werner, V, Wiederhold, J, and De Witte, H

Subjects
electromagnetic transitions, Nuclear Physics - Experiment, collective levels, ydinfysiikka, nuclear structure and decays
Abstract

A projectile Coulomb-excitation experiment was performed at the radioactive-ion beam facility HIE-ISOLDE at CERN to obtain $E2$ and $M1$ transition matrix elements of $^{140}$Nd using the multistep Coulomb-excitation code GOSIA. The absolute $M1$ strengths, $\textrm{B}(M1;2^+_2→2^+_1)=0.033(8)μ^2_N,\textrm{B}(M1;2^+_3→2^+_1)=0.26^{+0.11}_{−0.10}μ^2_N$, and $\textrm{B}(M1;2^+_4→2^+_1)

Published
2020

32. Physics opportunities with the Advanced Gamma Tracking Array : AGATA

Author

Korten, W., Atac, A., Beaumel, D., Bednarczyk, P., Bentley, M. A., Benzoni, G., Boston, A., Bracco, A., Cederkall, J., Cederwall, B., Ciemala, M., Clement, E., Crespi, F. C. L., Curien, D., de Angelis, G., Didierjean, F., Doherty, D. T., Dombradi, Zs., Duchene, G., Dudek, J., Fernandez-Dominguez, B., Fornal, B., Gadea, A., Gaffney, L. P., Gerl, J., Gladnishki, K., Goasduff, A., Gorska, M., Greenlees, P. T., Hess, H., Jenkins, D. G., John, P. R., Jungclaus, A., Kmiecik, M., Korichi, A., Labiche, M., Leoni, S., Ljungvall, J., Lopez-Martens, A., Maj, A., Mengoni, D., Million, B., Nannini, A., Napoli, D., Nolan, P. J., Nyberg, Johan, Obertelli, A., Pakarinen, J., Pietralla, N., Podolyak, Zs., Quintana, B., Raabe, R., Rainovski, G., Recchia, F., Reiter, P., Rudolph, D., Simpson, J., Theisen, Ch., Tonev, D., Tumino, A., Valiente-Dobon, J. J., Wieland, O., Wimmer, K., Zielinska, M., Korten, W., Atac, A., Beaumel, D., Bednarczyk, P., Bentley, M. A., Benzoni, G., Boston, A., Bracco, A., Cederkall, J., Cederwall, B., Ciemala, M., Clement, E., Crespi, F. C. L., Curien, D., de Angelis, G., Didierjean, F., Doherty, D. T., Dombradi, Zs., Duchene, G., Dudek, J., Fernandez-Dominguez, B., Fornal, B., Gadea, A., Gaffney, L. P., Gerl, J., Gladnishki, K., Goasduff, A., Gorska, M., Greenlees, P. T., Hess, H., Jenkins, D. G., John, P. R., Jungclaus, A., Kmiecik, M., Korichi, A., Labiche, M., Leoni, S., Ljungvall, J., Lopez-Martens, A., Maj, A., Mengoni, D., Million, B., Nannini, A., Napoli, D., Nolan, P. J., Nyberg, Johan, Obertelli, A., Pakarinen, J., Pietralla, N., Podolyak, Zs., Quintana, B., Raabe, R., Rainovski, G., Recchia, F., Reiter, P., Rudolph, D., Simpson, J., Theisen, Ch., Tonev, D., Tumino, A., Valiente-Dobon, J. J., Wieland, O., Wimmer, K., and Zielinska, M.

Abstract

New physics opportunities are opening up by the Advanced Gamma Tracking Array, AGATA, as it evolves to the full 4 pi instrument. AGATA is a high-resolution gamma -ray spectrometer, solely built from highly segmented high-purity Ge detectors, capable of measuring gamma rays from a few tens of keV to beyond 10 MeV, with unprecedented efficiency, excellent position resolution for individual gamma -ray interactions, and very high count-rate capability. As a travelling detector AGATA will be employed at all major current and near-future European research facilities delivering stable and radioactive ion beams.

Published
2020
Full Text
View/download PDF

33. Benchmarking the PreSPEC@GSI experiment for Coulex-multipolarimetry on the p( p3/2). p( p1/2) spin-flip transition in 85Br

Author

Napiralla, P., Lettmann, M., Stahl, C., Rainovski, G., Pietralla, N., Afara, S., Ameil, F., Arici, T., Aydin, S., Barrientos, D., Bednarczyk, P., Bentley, M. A., Benzoni, G., Birkenbach, B., Blazhev, A., Boston, A. J., Boutachkov, P., Bracco, A., Bruyneel, B., Clement, E., Cortes, M. L., Crespi, F. C. L., Cullen, D. M., Curien, D., Desesquelles, P., Didierjean, F., Domingo-Pardo, C., Duchene, G., Eberth, J., Egger, H., Fahlander, C., Gerl, J., Gladnishki, K. A., Golubev, P., Gonzalez, V, Gorska, M., Gottardo, A., Grassi, L., Habermann, T., Harkness-Brennan, L. J., Hess, H., Jenkins, D. G., John, P. R., Jolie, J., Judson, D. S., Kojouharov, I, Korten, W., Labiche, M., Lalovic, N., Lizarazo, C., Louchart-Henning, C., Maj, A., Menegazzo, R., Mengoni, D., Merchan, E., Million, B., Moeller, O., Moeller, T., Moschner, K., Modamio, V, Napoli, D., Singh, B. S. Nara, Podolyak, Zs, Pietri, S., Ralet, D., Reese, M., Reiter, P., Rudolph, D., Sanchis, E., Sarmiento, L. G., Schaffner, H., Simpson, J., Singh, P. P., Valiente-Dobon, J. J., Werner, V, Wieland, O., Napiralla, P., Lettmann, M., Stahl, C., Rainovski, G., Pietralla, N., Afara, S., Ameil, F., Arici, T., Aydin, S., Barrientos, D., Bednarczyk, P., Bentley, M. A., Benzoni, G., Birkenbach, B., Blazhev, A., Boston, A. J., Boutachkov, P., Bracco, A., Bruyneel, B., Clement, E., Cortes, M. L., Crespi, F. C. L., Cullen, D. M., Curien, D., Desesquelles, P., Didierjean, F., Domingo-Pardo, C., Duchene, G., Eberth, J., Egger, H., Fahlander, C., Gerl, J., Gladnishki, K. A., Golubev, P., Gonzalez, V, Gorska, M., Gottardo, A., Grassi, L., Habermann, T., Harkness-Brennan, L. J., Hess, H., Jenkins, D. G., John, P. R., Jolie, J., Judson, D. S., Kojouharov, I, Korten, W., Labiche, M., Lalovic, N., Lizarazo, C., Louchart-Henning, C., Maj, A., Menegazzo, R., Mengoni, D., Merchan, E., Million, B., Moeller, O., Moeller, T., Moschner, K., Modamio, V, Napoli, D., Singh, B. S. Nara, Podolyak, Zs, Pietri, S., Ralet, D., Reese, M., Reiter, P., Rudolph, D., Sanchis, E., Sarmiento, L. G., Schaffner, H., Simpson, J., Singh, P. P., Valiente-Dobon, J. J., Werner, V, and Wieland, O.

Abstract

A first performance test of the Coulomb excitation multipolarimetry (Coulex-multipolarimetry) method is presented. It is based on a 85Br pp3/ 2. pp1/ 2 spinflip experiment performed as part of the PreSPEC-AGATA campaign at the GSI Helmholtzzentrum fur Schwerionen-forschung (GSI). Via determination of background levels around the expected 85Br excitations as well as measured 197Au excitations, an upper limit for the M1 transition strength of the 1/2- 1. 3/2- g.s. transition in 85Br and a lower beam time limit for upcoming experimental campaigns utilizing Coulex-multipolarimetry have been inferred. The impact of the use of AGATA in its anticipated 1p configuration on these estimates is deduced via Geant4 simulations.

Published
2020

34. Restoring the valence-shell stabilization in Nd-140

Author

Kern, R., Zidarova, R., Pietralla, N., Rainovski, G., Stegmann, R., Blazhev, A., Boukhari, A., Cederkall, J., Cubiss, J. G., Djongolov, M., Fransen, C., Gaffney, L. P., Gladnishki, K., Giannopoulos, E., Hess, H., Jolie, J., Karayonchev, V, Kaya, L., Keatings, J. M., Kocheva, D., Kroell, Th, Moeller, O., O'Neill, G. G., Pakarinen, J., Reiter, P., Rosiak, D., Scheck, M., Snall, J., Soederstroem, P-A, Spagnoletti, P., Stoyanova, M., Thiel, S., Vogt, A., Warr, N., Welker, A., Werner, V, Wiederhold, J., De Witte, H., Kern, R., Zidarova, R., Pietralla, N., Rainovski, G., Stegmann, R., Blazhev, A., Boukhari, A., Cederkall, J., Cubiss, J. G., Djongolov, M., Fransen, C., Gaffney, L. P., Gladnishki, K., Giannopoulos, E., Hess, H., Jolie, J., Karayonchev, V, Kaya, L., Keatings, J. M., Kocheva, D., Kroell, Th, Moeller, O., O'Neill, G. G., Pakarinen, J., Reiter, P., Rosiak, D., Scheck, M., Snall, J., Soederstroem, P-A, Spagnoletti, P., Stoyanova, M., Thiel, S., Vogt, A., Warr, N., Welker, A., Werner, V, Wiederhold, J., and De Witte, H.

Abstract

A projectile Coulomb-excitation experiment was performed at the radioactive-ion beam facility HIE-ISOLDE at CERN to obtain E2 and M1 transition matrix elements of Nd-140 using the multistep Coulomb-excitation code GOSIA. The absolute M1 strengths, B(M1; 2(2)(-) -> 2(1)(+)) = 0.033(8)mu(2)(N), B(M1 ; 2(3)(+) -> 2(1)(+)) = 0.26(-0.10)(+0.11)mu(2)(N), and B(M1; 2(4)+ -> 2(1)(+)) < 0.04 mu(2)(N) identify the 2(3)(+) state as the main fragment of the one-quadrupole-phonon proton-neutron mixed-symmetry state of Nd-140. The degree of F-spin mixing in Nd-140 was quantified with the determination of the mixing matrix element VF-mix < 7(-7)(-13) keV.

Published
2020

35. Experimental evidence for low-lying quadrupole isovector excitation of Po-208

Author

Yaneva, A., Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Dewald, A., Djongolov, M., Fransen, C., Gladnishki, K. A., Henrich, C., Homm, I, Ide, K. E., John, P. R., Kalaydjieva, D., Karayonchev, V, Kern, R., Kleemann, J., Kroell, Th, Mueller-Gatermann, C., Scheck, M., Spagnoletti, P., Stoyanova, M., Werner, V, Yaneva, A., Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Dewald, A., Djongolov, M., Fransen, C., Gladnishki, K. A., Henrich, C., Homm, I, Ide, K. E., John, P. R., Kalaydjieva, D., Karayonchev, V, Kern, R., Kleemann, J., Kroell, Th, Mueller-Gatermann, C., Scheck, M., Spagnoletti, P., Stoyanova, M., and Werner, V

Abstract

We present the results from an experiment dedicated to measure the lifetime of the 2(2)(+) state, candidate for the one-phonon mixed-symmetry state, of Po-208. This nucleus was studied in the a-transfer reaction Pb-204(C-12,Be-8)208Po and the lifetime of the 2(2)(+) state was determined by utilizing the Doppler-shift attenuation method. The experimental data show that the 2(2)(+) state decays with a sizable M1 transition to the 2(1)(+) state revealing its isovector nature.

Published
2020

36. Lifetimes of the 41+ states of Po206 and Po204 : A study of the transition from noncollective seniority-like mode to collectivity

Author

Stoyanova, M., primary, Rainovski, G., additional, Jolie, J., additional, Pietralla, N., additional, Blazhev, A., additional, Beckers, M., additional, Dewald, A., additional, Djongolov, M., additional, Esmaylzadeh, A., additional, Fransen, C., additional, Gerhard, L. M., additional, Gladnishki, K. A., additional, Herb, S., additional, John, P. R., additional, Karayonchev, V., additional, Keatings, J. M., additional, Kern, R., additional, Knafla, L., additional, Kocheva, D., additional, Kornwebel, L., additional, Kröll, Th., additional, Ley, M., additional, Mashtakov, K. M., additional, Müller-Gatermann, C., additional, Régis, J.-M., additional, Scheck, M., additional, Schomacker, K., additional, Sinclair, J., additional, Spagnoletti, P., additional, Sürder, C., additional, Warr, N., additional, Werner, V., additional, and Wiederhold, J., additional

Published
2019
Full Text
View/download PDF

37. Lifetimes of the 4(1)(+) states of Po-206 and Po-204: A study of the transition from noncollective seniority-like mode to collectivity

Author

Stoyanova, M., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Beckers, M., Dewald, A., Djongolov, M., Esmaylzadeh, A., Fransen, C., Gerhard, L. M., Gladnishki, K. A., Herb, S., John, P. R., Karayonchev, V, Keatings, J. M., Kern, R., Knafla, L., Kocheva, D., Kornwebel, L., Kroell, Th, Ley, M., Mashtakov, K. M., Mueller-Gatermann, C., Regis, J. M., Scheck, M., Schomacker, K., Sinclair, J., Spagnoletti, P., Suerder, C., Warr, N., Werner, V, Wiederhold, J., Stoyanova, M., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Beckers, M., Dewald, A., Djongolov, M., Esmaylzadeh, A., Fransen, C., Gerhard, L. M., Gladnishki, K. A., Herb, S., John, P. R., Karayonchev, V, Keatings, J. M., Kern, R., Knafla, L., Kocheva, D., Kornwebel, L., Kroell, Th, Ley, M., Mashtakov, K. M., Mueller-Gatermann, C., Regis, J. M., Scheck, M., Schomacker, K., Sinclair, J., Spagnoletti, P., Suerder, C., Warr, N., Werner, V, and Wiederhold, J.

Abstract

Low-lying yrast states of Po-204 and Po-206 were investigated by the gamma-gamma fast timing technique with LaBr3(Ce) detectors. Excited states of these nuclei were populated in the Au-197(B-11, 4n)Po-204 and the Pt-198(C-12, 4n )Po-206 fusion-evaporation reactions, respectively. The beams were delivered by the FN-Tandem accelerator at the University of Cologne. The lifetimes of the 4(1)(+) states of both nuclei were measured, along with an upper lifetime limit for the 2(1)(+) state of Po-204. A comparison between the derived B(E2; 4(1)(+) -> 2(1)(+)) values and results from simplified empirical two-state mixing calculations suggests that for the 4(1)(+) states of even-even polonium isotopes the transition from single-particle mode at N = 126 to collective mode, when reducing the number of neutrons, occurs above N = 122.

Published
2019

38. Nuclear moments and transition probabilities in the vicinity of the doubly magic '\^{208}'Pb. '\^{210}'Po and '\^{210}'Pb studies during the LS2

Author

Stuchbery, A, Georgiev, G, Allmond, J, Balabanski, D, Bignell, L, Blazhev, A, Boukhari, A, Braunroth, T, Dewald, A, Fransen, C, Gaffney, L, Gladnishki, K, Kibedi, T, Kusoglu, A, Lane, G, Ljungvall, L, Lozeva, R, Mitchell, A, Müller-Gatermann, C, Rainovski, G, Ralet, D, and Warr, N

Subjects
Detectors and Experimental Techniques
Published
2017

39. Low collectivity of the first 2+ states of 212,210Po

Author

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

Published
2018
Full Text
View/download PDF

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

Author

Kocheva , D., Rainovski , G., Jolie , J., Pietralla , N., Blazhev , A., Astier , A., Altenkirch , R., Ansari , S., Braunroth , Th., Cortés , M.L., Dewald , A., Diel , F., Djongolov , M., Fransen , C., Gladnishki , K., Hennig , A., Karayonchev , V., Keatings , J.M., Kluge , E., Litzinger , J., Müller-Gatermann , C., Petkov , P., Rudigier , M., Scheck , M., Scholz , Ph., Spagnoletti , P., Spieker , M., Stahl , C., Stegmann , R., Stoyanova , M., Thöle , P., Warr , N., Werner , V., Zell , K.O., Van Isacker , P., Ponomarev , V.Yu., Wölk , D., Witt , W., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière ( CSNSM ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Grand Accélérateur National d'Ions Lourds ( GANIL ), and Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS )

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

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

Published
2017
Full Text
View/download PDF

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

Author

Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Altenkirch, R., Ansari, S., Astier, A., Bast, M., Beckers, M., Braunroth, Th., Cappellazzo, M., Dewald, A., Diel, F., Djongolov, M., Fransen, C., Gladnishki, K., Goldkuhle, A., Hennig, A., Karayonchev, V., Keatings, J.M., Kluge, E., Kröll, Th., Litzinger, J., Moschner, K., Müller-Gatermann, C., Petkov, P., Scheck, M., Scholz, Ph., Schmidt, T., Spagnoletti, P., Stahl, C., Stegmann, R., Stolz, A., Vogt, A., Warr, N., Werner, V., Wölk, D., Zamora, J.C., Zell, K.O., Ponomarev, V.Yu., Van Isacker, P., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

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

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

Published
2017
Full Text
View/download PDF

42. Lifetime measurements in Ru 100

Author

Konstantinopoulos, T. Petkov, P. Goasduff, A. Arici, T. Astier, A. Atanasova, L. Axiotis, M. Bonatsos, D. Detistov, P. Dewald, A. Eller, M.J. Foteinou, V. Gargano, A. Georgiev, G. Gladnishki, K. Gottardo, A. Harissopulos, S. Hess, H. Kaim, S. Kocheva, D. Kusoglu, A. Lagoyannis, A. Ljungvall, J. Lutter, R. Matea, I. Melon, B. Mertzimekis, T.J. Nannini, A. Petrache, C.M. Petrovici, A. Provatas, G. Reiter, P. Rocchini, M. Roccia, S. Seidlitz, M. Siebeck, B. Suzuki, D. Warr, N. De Witte, H. Zerrouki, T.

Abstract

The nucleus Ru100 appears to be a good candidate for the E(5) critical point symmetry which describes the U(5)-SO(6) shape phase transition. To investigate this point with respect to the electromagnetic transition strengths, lifetime measurements of its yrast states have been performed using the recoil distance Doppler shift technique as well as the Doppler shift attenuation method. As a result, the lifetimes of the yrast 2+, 4+, and 8+ states were determined. The deduced transition strengths are compared to the E(5) predictions as well as to the results of excited Vampir and shell-model calculations. © 2017 American Physical Society.

Published
2017

43. Lifetime measurements in $^{100}$Ru

Author

Konstantinopoulos, T., Petkov, P., Goasduff, A., Arici, T., Astier, A., Atanasova, L., Axiotis, M., Bonatsos, D., Detistov, P., Dewald, A., Eller, M.J., Foteinou, V., Gargano, A., Georgiev, G., Gladnishki, K., Gottardo, A., Harissopulos, S., Hess, H., Kaim, S., Kocheva, D., Kusoglu, A., Lagoyannis, A., Ljungvall, J., Lutter, R., Matea, I., Melon, B., Mertzimekis, T.J., Nannini, A., Petrache, C.M., Petrovici, A., Provatas, G., Reiter, P., Rocchini, M., Roccia, S., Seidlitz, M., Siebeck, B., Suzuki, D., Warr, N., De Witte, H., Zerrouki, T., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

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

International audience; The nucleus Ru100 appears to be a good candidate for the E(5) critical point symmetry which describes the U(5)-SO(6) shape phase transition. To investigate this point with respect to the electromagnetic transition strengths, lifetime measurements of its yrast states have been performed using the recoil distance Doppler shift technique as well as the Doppler shift attenuation method. As a result, the lifetimes of the yrast 2+, 4+, and 8+ states were determined. The deduced transition strengths are compared to the E(5) predictions as well as to the results of excited Vampir and shell-model calculations.

Published
2017
Full Text
View/download PDF

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

Author

Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Stahl, Clement, Petkov, P., Blazhev, A., Hennig, A., Astier, A., Braunroth, Th., Cortes, M. L., Dewald, A., Djongolov, M., Fransen, C., Gladnishki, K., Karayonchev, V., Litzinger, J., Muller-Gatermann, C., Scheck, M., Scholz, Ph., Stegmann, R., Thole, P., Werner, V., Witt, W., Wolk, D., van Isacker, P., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

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

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

Published
2016
Full Text
View/download PDF

45. Search formixed-symmetry states of nuclei in the vicinity of the double-magic nucleus 208Pb

Author

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

Abstract

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

Published
2016
Full Text
View/download PDF

46. Low collectivity of the 21+ state of Po212

Author

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

Published
2017
Full Text
View/download PDF

47. A revised B(E2;2+ 1 $ \rightarrow$ → 0+ 1) value in the semi-magic nucleus 210Po

Author

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

Published
2017
Full Text
View/download PDF

48. Lifetimes and electromagnetic transition strengths in Dy157

Author

Gladnishki, K. A., primary, Petkov, P., additional, Möller, O., additional, Dewald, A., additional, Jolie, J., additional, Tonev, D., additional, Trichkova, M., additional, Heinze, S., additional, von Brentano, P., additional, Bazzacco, D., additional, Ur, C. A., additional, Farnea, E., additional, Axiotis, M., additional, Lunardi, S., additional, de Angelis, G., additional, Napoli, D. R., additional, Marginean, N., additional, Martinez, T., additional, Caprio, M. A., additional, and Rainovski, G., additional

Published
2017
Full Text
View/download PDF

49. Search for mixed-symmetry states of nuclei in the vicinity of the double-magic nucleus

Author

Kocheva, D., Stegmann, R., Rainovski, G., Jolie, J., Pietralla, N., Stahl, Clement, Petkov, P., Blazhev, A., Hennig, A., Bauer, C., Braunroth, Th., Cortes, L., Dewald, A., Djongolov, M., Fransen, C., Gladnishki, K., Karayonchev, V., Lettmann, M., Litzinger, J., Möller, Th., Müller-Gatermann, C., Scheck, M., Scholz, Ph., Schramm, C., Thöle, P., Werner, V., Wölk, D., Zhu, S., Van Isacker, P., Grand Accélérateur National d'Ions Lourds (GANIL), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

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

This is an Open Access article distributed under the terms of Creative Commons Attribution Licence 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.; International audience; In this work we present the results from two experiments dedicated to search for quadrupole-collective isovector valence-shell excitation, the states with so-called mixed proton-neutron symmetry (MSS), in nuclei around the doubly magic nucleus $^{208}$Pb. $^{212}$Po was studied in an α-transfer reaction. $^{204}$Hg was studied in an inverse kinematics Coulomb excitation reaction on a carbon target. Both experiments provide indications for existence of one-phonon MSSs. Those are the first experimentally identified MSSs in the mass A ≈ 208 region.

Published
2015
Full Text
View/download PDF

50. Lifetime measurements in Ru-100

Author

Konstantinopoulos, T., Petkov, P., Goasduff, A., Arici, T., Astier, A., Atanasova, L., Axiotis, M., Bonatsos, D., Detistov, P., Dewald, A., Eller, M. J., Foteinou, V., Gargano, A., Georgiev, G., Gladnishki, K., Gottardo, A., Harissopulos, S., Hess, H., Kaim, S., Kocheva, D., Kusoglu, A., Lagoyannis, A., Ljungvall, J., Lutter, R., Matea, I., Melon, B., Mertzimekis, T. J., Nannini, A., Petrache, C. M., Petrovici, A., Provatas, G., Reiter, P., Rocchini, M., Roccia, S., Seidlitz, M., Siebeck, B., Suzuki, D., Warr, N., De Witte, H., Zerrouki, T., Konstantinopoulos, T., Petkov, P., Goasduff, A., Arici, T., Astier, A., Atanasova, L., Axiotis, M., Bonatsos, D., Detistov, P., Dewald, A., Eller, M. J., Foteinou, V., Gargano, A., Georgiev, G., Gladnishki, K., Gottardo, A., Harissopulos, S., Hess, H., Kaim, S., Kocheva, D., Kusoglu, A., Lagoyannis, A., Ljungvall, J., Lutter, R., Matea, I., Melon, B., Mertzimekis, T. J., Nannini, A., Petrache, C. M., Petrovici, A., Provatas, G., Reiter, P., Rocchini, M., Roccia, S., Seidlitz, M., Siebeck, B., Suzuki, D., Warr, N., De Witte, H., and Zerrouki, T.

Abstract

The nucleus Ru-100 appears to be a good candidate for the E(5) critical point symmetry which describes the U(5)-SO(6) shape phase transition. To investigate this point with respect to the electromagnetic transition strengths, lifetime measurements of its yrast states have been performed using the recoil distance Doppler shift technique as well as the Doppler shift attenuation method. As a result, the lifetimes of the yrast 2(+), 4(+), and 8(+) states were determined. The deduced transition strengths are compared to the E(5) predictions as well as to the results of excited Vampir and shell-model calculations.

Published
2017

Catalog

Books, media, physical & digital resources
See catalog results