21 results on '"Blazhev, Andrey"'
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2. Isomeric Lifetime Measurement in the Neutron-rich 189Ta
- Author
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Alhomaidhi Sultan, Sahin Elif, Werner Volker, Jolie Jan, Regan Patrick, Pietralla Norbert, Gerl Jürgen, Górska Magdalena, Benzoni Giovanna, Mistry Andrew K., Hubbard Nicolas, Aggez Guler, Albers Helena M., Arici Tugba, Armstrong Michael, Banerjee Akashrup, Das Biswarup, Davinson Thomas, Hall Oscar, Kojouharov Ivan, Koseoglou Pavlos, Mikolajczuk Michal, Podolyák Zsolt, Polettini Marta, Rudigier Matthias, Schaffner Henning, Wollersheim Hans-Jürgen, Yaneva Aleksandrina, Boutachkov Plamen, Dickel Timo, Haettner Emma, Heggen Henning, Hornung Christine, Knöbel Ronja, Kostyleva Daria, Kurz Nikolaus, Kuzminchuk Natalia, Mukha Ivan, Pietri Stephane, Plaß Wolfgang, Scheidenberger Christoph, Tanaka Yoshiki, Weick Helmut, Ahmed Usama, Aktas Özge, Algora Alejandro, Appleton Corrigan, Blazhev Andrey, Bruce Alison, Cederwall Bo, Chishti Muhammad M. R., Cortes Martha L., Crespi Fabio, Dobon Jose J., Doncel Maria, Ertoprak Aysegül, Esmaylzadeh Arwin, Expósito Marcos L., Fraile Luis M., García Jaime B., Gottardo Andrea, Ha Jeongsu, Jazrawi Shaheen, John Philipp R., Jones Calum, Karayonchev Vasil, Kern Ralph, Knafla Lukas, Kosir Gregor, Lozeva Radomira, Mengoni Daniele, Mertzimekis Theo J., Million Bénédicte, Morales Anabel, Murias Javier R., Orrigo Sonja E. A., Pellumaj Julgen, Pelonis Stefanos, Petrović Jana, Pigliapoco Sara, Quintana Begoña, Recchia Francesco, Rezynkina Kseniia, Sexton Lewis, Singh Nara, Söderström Pär-Anders, Sood Arshiya, Vasileiou Polytimos, Vesic Jelena, Wiederhold Johannes, zhang guangxin, Zidarova Radostina, and Zyriliou Aikaterini
- Subjects
Physics ,QC1-999 - Abstract
Isomeric states of the neutron-rich isotope 18973Ta116 were populated via fragmentation of a primary beam of 208Pb ions at 1 GeV/u impinging on a 9Be target at GSI, Darmstadt, Germany. The isotopes of interest were separated, identified and delivered to the DESPEC setup. Two isomers were deduced in 189Ta116 and their lifetimes were measured based on the γ-ray time distributions.
- Published
- 2023
- Full Text
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3. Studying Gamow-Teller transitions and the assignment of isomeric and ground states at N = 50
- Author
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Mollaebrahimi, Ali, Hornung, Christine, Dickel, Timo, Amanbayev, Daler, Kripko-Koncz, Gabriella, Plaß, Wolfgang R., Ayet San Andrés, Samuel, Beck, Sönke, Blazhev, Andrey, Bergmann, Julian, Geissel, Hans, Górska, Magdalena, Grawe, Hubert, Greiner, Florian, Haettner, Emma, Kalantar-Nayestanaki, Nasser, Miskun, Ivan, Nowacki, Frédéric, Scheidenberger, Christoph, Bagchi, Soumya, Balabanski, Dimiter L., Brencic, Ziga, Charviakova, Olga, Constantin, Paul, Dehghan, Masoumeh, Ebert, Jens, Gröf, Lizzy, Hall, Oscar, Harakeh, Muhsin N., Kaur, Satbir, Kankainen, Anu, Knöbel, Ronja, Kostyleva, Daria A., Kurkova, Natalia, Kuzminchuk, Natalia, Mardor, Israel, Nichita, Dragos, Otto, Jan-Hendrik, Patyk, Zygmunt, Pietri, Stephane, Purushothaman, Sivaji, Reiter, Moritz Pascal, Rink, Ann-Kathrin, Roesch, Heidi, Spătaru, Anamaria, Stanic, Goran, State, Alexandru, Tanaka, Yoshiki K., Vencelj, Matjaz, Weick, Helmut, Winfield, John S., Yavor, Michael I., and Zhao, Jianwei
- Published
- 2023
- Full Text
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4. Preliminary results of lifetime measurements in neutron-rich 53Ti
- Author
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Goldkuhle Alina, Fransen Christoph, Dewald Alfred, Alahari Navin, Beckers Marcel, Birkenbach Benedikt, Blazhev Andrey, Braunroth Thomas, Clément Emmanuel, De France Gilles, Dudouet Jérémie, Eberth Jürgen, Hess Herbert, Jacquot Bertrand, Kim Yung-Hee, Lemasson Antoine, Lenzi Silvia Monica, Li Hongjie, Ljungvall Joa, Litzinger Julia, Michelagnoli Caterine, Müller-Gatermann Claus, Napoli Daniel Ricardo, Nara Singh Bondili Sreenivasa, Perez-Vidal Rosa Maria, Ralet Damian, Reiter Peter, Rejmund Maurycy, Vogt Andreas, Warr Nigel, Zell Karl Oskar, and Zielińska Magda
- Subjects
Physics ,QC1-999 - Abstract
To study the nuclear structure of neutron-rich titanium isotopes, a lifetime measurement was performed at the Grand Accélérateur National d'Ions Lourds (GANIL) facility in Caen, France. The nucleiwere produced in a multinucleon-transfer reaction by using a 6.76 MeV/u 238U beam. The Advanced Gamma Tracking Array (AGATA) was employed for the γ-ray detection and target-like recoils were identified event-by-event by the large-acceptance variable mode spectrometer (VAMOS++). Preliminary level lifetimes of the (5/2−) to 13/2− states of the yrast band in the neutron-rich nucleus 53Ti were measured for the first time employing the recoil distance Doppler-shift (RDDS) method and the compact plunger for deep inelastic reactions. The differential decay curve method (DDCM) was used to obtain the lifetimes from the RDDS data.
- Published
- 2019
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5. Lifetimes and electromagnetic transition strength in 124Ba
- Author
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Trichkova Mariya, Beckers Marcel, Gladnishki Kalin, Dewald Alfred, Blazhev Andrey, Müller-Gatermann Claus, Fransen Christoph, Jolie Jan, Kalaydjieva Desislava, Rainovski Georgi, and Zell Karl-Oskar
- Subjects
Physics ,QC1-999 - Abstract
Lifetimes of excited states of 124Ba were measured by the Recoil Distance Doppler Shift (RDDS) technique. The γ-ray coincidence data were analysed by the Differential Decay Curve method (DDCM). The trend of the experimentally deduced normalized B(E2) values reveals a drop at the 8+1 state, which may be caused by structural changes in the backbending region.
- Published
- 2018
- Full Text
- View/download PDF
6. A study on the transition between seniority-type and collective excitations in 204Po and 206Po
- Author
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Stoyanova Milena, Rainovski Georgi, Jolie Jan, Pietralla Norbert, Blazhev Andrey, Djongolov Martin, Esmaylzadeh Arwin, Gerhard Lisa, Gladnishki Kalin, Karayonchev Vasil, Keatings James, Kern Ralph, Kocheva Diana, Kröll Thorsten, Mashtakov Konstantin, Möller Oliver, Régis Jean-Marc, Scheck Marcus, Schomacker Kerstin, Sinclair Jacqueline, Sürder Chistian, Werner Volker, and Wiederhold Johannes
- Subjects
Physics ,QC1-999 - Abstract
Low-lying yrast states in 204Po and 206Po have been investigated by the γ-γ fast timing technique with LaBr3(Ce) detectors. Excited states of these nuclei were populated in the 197Au(11B,4n) and the 198Pt(12C,4n) fusion-evaporation reactions, respectively, at the FN-Tandem Facility at the University of Cologne. The lifetimes of the 4+1 states in both nuclei were measured, along with an upper limit for the 2+1 state in 204Po. The preliminary results are discussed in the scope of the systematic behavior of the transition strengths between yrast states in polonium isotopes.
- Published
- 2018
- Full Text
- View/download PDF
7. Search for Isovector Valence-Shell Excitations in 140Nd and 142Sm via Coulomb excitation reactions of radioactive ion beams
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Kern Ralph, Stegmann Robert, Pietralla Norbert, Rainovski Georgi, Gaffney Liam Paul, Blazhev Andrey, Boukhari Amar, Cederkäll Joakim, Cubiss James, Djongolov Martin, Fransen Christoph, Gladnishki Kalin, Giannopoulos Efstathios, Hess Herbert, Jolie Jan, Karayonchev Vasil, Kaya Levent, Keatings James, Kocheva Diana, Kröll Thorsten, Möller Oliver, O'Neill George, Pakarinen Janne, Reiter Peter, Rosiak Dawid, Scheck Marcus, Snall Jacob, Söderström Pär-Anders, Spagnoletti Pietro, Stoyanova Milena, Thiel Stefan, Vogt Andreas, Warr Nigel, Welker Andree, Werner Volker, Wiederhold Johannes, De Witte Hilde, and Zidarova Radostina
- Subjects
Physics ,QC1-999 - Abstract
Projectile Coulomb excitation experiments were performed at HIE-ISOLDE at CERN with the radioactive ion beams of 140Nd and 142Sm. Ions with an energy of 4:62 MeV/A were impinging on a 1.45 mg/cm2 thick 208Pb target. The γ-rays depopulating the Coulomb-excited states were recorded by the HPGe-array MINIBALL and scattered particles were detected by a double-sided silicon strip detector. Experimental intensities were used for the determination of electromagnetic transition matrix elements. A preliminary result of the B(M1; 2+3 → 2+1) of 140Nd and an upper limit for the case of 142Sm are revealing the main fragments of the proton-neutron mixed-symmetry 2+1;ms states.
- Published
- 2018
- Full Text
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8. Isomer studies in the vicinity of the doubly-magic nucleus 100Sn: Observation of a new low-lying isomeric state in 97Ag
- Author
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Hornung, Christine, Amanbayev, Daler, Dedes, Irene, Kripko-Koncz, Gabriella, Miskun, Ivan, Shimizu, Noritaka, Ayet San Andrés, Samuel, Bergmann, Julian, Dickel, Timo, Dudek, Jerzy, Ebert, Jens, Geissel, Hans, Górska, Magdalena, Grawe, Hubert, Greiner, Florian, Haettner, Emma, Otsuka, Takaharu, Plaß, Wolfgang R., Purushothaman, Sivaji, Rink, Ann-Kathrin, Scheidenberger, Christoph, Weick, Helmut, Bagchi, Soumya, Blazhev, Andrey, Charviakova, Olga, Curien, Dominique, Finlay, Andrew, Kaur, Satbir, Lippert, Wayne, Otto, Jan-Hendrik, Patyk, Zygmunt, Pietri, Stephane, Tanaka, Yoshiki K., Tsunoda, Yusuke, and Winfield, John S.
- Published
- 2020
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9. Isomer studies in the vicinity of the doubly-magic nucleus Sn: Observation of a new low-lying isomeric state in Ag
- Author
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Hornung, Christine, Amanbayev, Daler, Dedes, Irene, Kripko-Koncz, Gabriella, Miskun, Ivan, Shimizu, Noritaka, Ayet San Andrés, Samuel, Bergmann, Julian, Dickel, Timo, Dudek, Jerzy, Ebert, Jens, Geissel, Hans, Górska, Magdalena, Grawe, Hubert, Greiner, Florian, Haettner, Emma, Otsuka, Takaharu, Plaß, Wolfgang R., Purushothaman, Sivaji, Rink, Ann-Kathrin, Scheidenberger, Christoph, Weick, Helmut, Bagchi, Soumya, Blazhev, Andrey, Charviakova, Olga, Curien, Dominique, Finlay, Andrew, Kaur, Satbir, Lippert, Wayne, Otto, Jan-Hendrik, Patyk, Zygmunt, Pietri, Stephane, Tanaka, Yoshiki K., Tsunoda, Yusuke, and Winfield, John S.
- Abstract
Long-lived isomeric states in $^{97}$Ag and $^{101−109}$In were investigated with the FRS Ion Catcher at GSI. In the isotope $^{97}$Ag, a long-lived (1/2−) isomeric state was discovered, and its excitation energy was determined to be 618(38) keV. This is simultaneously the first discovery of a nuclear isomeric state by multiple-reflection time-of-flight mass spectrometry. The measured excitation energies were compared to large-scale shell-model calculations, which indicated the importance of core excitation around $^{100}$Sn. Furthermore, advanced mean-field calculations for the $^{97}$Ag nucleus and relevant neighboring nuclei were performed, which have contributed to a better understanding of the repetitive appearance of certain isomeric structures in neighboring nuclei, and which have supported the discovery of the isomeric state in $^{97}$Ag in a global shell-evolution scheme.
- Published
- 2020
10. Performing the differential decay curve method on y-ray transitions with unresolved Doppler-shifted components
- Author
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Barber, Liam, Cullen, David M., Giles, M.M., Nara Singh, B.S., Mallaburn, M.J., Beckers, Marcel, Blazhev, Andrey, Braunroth, Thomas, Dewald, Alfred, Fransen, Christoph, Goldkuhle, Alina, Jolie, Jan, Mammes, Franziska, Müller-Gatermann, Claus, Wölk, Dorothea, Zell, Karl Oskar, and Publica
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unresolved Doppler-shifted component ,RDDS ,DDCM ,UDCM ,plunger ,nuclear-state lifetime - Abstract
A new method of extracting the g-ray intensities necessary to perform lifetime measurements using the differential decay curve method (DDCM) is presented in this work, the unresolved Doppler-shifted components method (UDCM). The UDCM allows for a DDCM analysis to be performed using a g-ray transition for which the fully Doppler-shifted and degraded components are unresolvable in energy and so are detected as a single peak. This technique was used to measure the known lifetime of the yrast 2+1 state in 50Mn with a depopulating transition that does not have resolvable fully Doppler-shifted and degraded components. The lifetime measured through applying the UDCM was consistent with the standard DDCM measurement of the 2+1 state. Use of the UDCM allows for DDCM lifetime measurements to be made using transitions of smaller g-ray energies, smaller recoil velocities and, in some cases, with a smaller uncertainty. In contrast to a standard DDCM analysis, a UDCM analysis is also independent of the widths of the fully Doppler-shifted and degraded components and as a result they do not need to be determined.
- Published
- 2020
11. Proton-proton correlations observed in two-proton radioactivity of 94Ag
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Mukha, Ivan, Roeckl, Ernst, Batist, Leonid, Blazhev, Andrey, Doring, Joachim, Grawe, Hubert, Grigorenko, Leonid, Huyse, Mark, Janas, Zenon, Kirchner, Reinhard, La Commara, Marco, Mazzocchi, Chiara, Tabor, Sam L., and Van Duppen, Piet
- Subjects
Environmental issues ,Science and technology ,Zoology and wildlife conservation - Abstract
Author(s): Ivan Mukha (corresponding author) [1, 2, 3, 10]; Ernst Roeckl [1]; Leonid Batist [4]; Andrey Blazhev [1, 5]; Joachim Doring [1]; Hubert Grawe [1]; Leonid Grigorenko [6]; Mark Huyse [...]
- Published
- 2006
- Full Text
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12. Probing isospin symmetry in the (50Fe, 50Mn, 50Cr) isobaric triplet via electromagnetic transition rates
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Giles, Michael M., Nara Singh, B.S., Barber, Liam, Cullen, David M., Mallaburn, M.J., Beckers, Marcel, Blazhev, Andrey, Braunroth, Thomas, Dewald, Alfred, Fransen, Christoph, Goldkuhle, Alina, Jolie, Jan, Mammes, Franziska, Müller-Gatermann, Claus, Wölk, Dorothea, Zell, Karl Oskar, Lenzi, Silvia M., Poves, Alfredo, and Publica
- Abstract
Lifetimes of the T = 1 isobaric analog Ip = 2+ states in 50Mn and 50Cr were measured simultaneously by employing the recoil distance Doppler-shift (RDDS) technique. The states were populated in a fusion-evaporation reaction with a ¹²C beam on a 40Ca target. An analysis of the data and the calculations from the present work, together with the available B(E2 : 2+ RT 0+) data of the isobaric analog states in 50Fe and 50Cr, were used to study isospin symmetry in the three A = 50 isobaric nuclei. Shell-model calculations reproduce the magnitudes as well as the increasing trend of the B(E2) data with increasing Z. To draw a firm conclusion on the level of isospin mixing in the triplet, a new precision measurement of the 2+ RT 0+ transition rate in 50Fe will be required.
- Published
- 2019
13. Preliminary results of lifetime measurements in neutron-rich 53Ti.
- Author
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de Angelis, G., Corradi, L., Goldkuhle, Alina, Fransen, Christoph, Dewald, Alfred, Alahari, Navin, Beckers, Marcel, Birkenbach, Benedikt, Blazhev, Andrey, Braunroth, Thomas, Clément, Emmanuel, De France, Gilles, Dudouet, Jérémie, Eberth, Jürgen, Hess, Herbert, Jacquot, Bertrand, Kim, Yung-Hee, Lemasson, Antoine, Lenzi, Silvia Monica, and Li, Hongjie
- Subjects
NEUTRONS ,TITANIUM isotopes ,NUCLEAR structure ,INELASTIC scattering ,SPECTROMETERS - Abstract
To study the nuclear structure of neutron-rich titanium isotopes, a lifetime measurement was performed at the Grand Accélérateur National d'Ions Lourds (GANIL) facility in Caen, France. The nucleiwere produced in a multinucleon-transfer reaction by using a 6.76 MeV/u
238 U beam. The Advanced Gamma Tracking Array (AGATA) was employed for the γ-ray detection and target-like recoils were identified event-by-event by the large-acceptance variable mode spectrometer (VAMOS++). Preliminary level lifetimes of the (5/2− ) to 13/2− states of the yrast band in the neutron-rich nucleus53 Ti were measured for the first time employing the recoil distance Doppler-shift (RDDS) method and the compact plunger for deep inelastic reactions. The differential decay curve method (DDCM) was used to obtain the lifetimes from the RDDS data. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
14. A revised B(E2; 21+ RT 01+) value in the semi-magic nucleus ²¹0Po
- Author
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Kocheva, Diana, Rainovski, Georgi, Jolie, Jan, Pietralla, Norbert, Blazhev, Andrey, Astier, Alain, Altenkirch, Richard, Ansari, Saba, Braunroth, Thomas, Cortés, Martha Liliana, Dewald, Alfred, Diel, Felix, Djongolov, Martin, Fransen, Christoph, Gladnishki, Kalin, Hennig, Andreas, Karayonchev, Vasil, Keatings, James Michael, Kluge, Eschly, Litzinger, Julia, Müller-Gatermann, Claus, Petkov, Pavel, Rudigier, Matthias, Scheck, Marcus, Scholz, Philipp, Spagnoletti, Pietro, Spieker, Mark, Stahl, Christian, Stegmann, Robert, Stoyanova, Milena, Thöle, Pierre, Warr, Nigel, Werner, Volker, Witt, Waldemar, Wölk, Dorothea, Zell, Karl Oskar, Isacker, Piet van, Ponomarev, Vladimir Y., and Publica
- Abstract
The lifetimes of the 21+ , the 22+ and the 31- states of ²¹0Po have been measured in the ²08Pb(¹²C,¹0Be)²¹0Po transfer reaction by the Doppler-shift attenuation method. The result for the lifetime of the 21+ 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 21+ , 41+ , 61+ , and 81+ states of ²¹0Po 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
15. Low collectivity of the 21+ state of ²¹²Po
- Author
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Kocheva, Diana, Rainovski, Georgi, Jolie, Jan, Pietralla, Norbert, Blazhev, Andrey, Altenkirch, Richard, Ansari, Saba, Astier, Alain, Bast, Marcel, Beckers, Marcel, Braunroth, Thomas, Cappellazzo, Mario, Dewald, Alfred, Diel, Felix, Djongolov, Martin, Fransen, Christoph, Gladnishki, Kalin, Goldkuhle, Alina, Hennig, Andreas, Karayonchev, Vasil, Keatings, James Michael, Kluge, Eschly, Kröll, Thorsten, Litzinger, Julia, Moschner, Kevin, Müller-Gatermann, Claus, Petkov, Pavel, Scheck, Marcus, Scholz, Philipp, Schmidt, Tobias, Spagnoletti, Pietro, Stahl, Christian, Stegmann, Robert, Stolz, Alexander, Vogt, Andreas, Warr, Nigel, Werner, Volker, Wölk, Dorothea, Zamora, Juan Carlos, Zell, Karl Oskar, Ponomarev, Vladimir Yu., Isacker, Piet van, and Publica
- Abstract
The lifetime of the 21+ state of ²¹²Po was measured in the ²08Pb(¹²C,8Be)²¹²Po transfer reaction by g-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 a-cluster components in the structure of the 21+ state. It is demonstrated that a consistent description of the properties of the 21+− 41+− 61+− 81+ sequence in ²¹²Po 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 ²¹0Pb and ²¹0Po.
- Published
- 2017
16. Lifetimes and electromagnetic transition strength in 124Ba.
- Author
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Arsenyev, N., Bezbakh, A., Rogov, I., Shneidman, T., Vdovin, A., Trichkova, Mariya, Beckers, Marcel, Gladnishki, Kalin, Dewald, Alfred, Blazhev, Andrey, Müller-Gatermann, Claus, Fransen, Christoph, Jolie, Jan, Kalaydjieva, Desislava, Rainovski, Georgi, and Zell, Karl-Oskar
- Subjects
BARIUM compounds ,ELECTROMAGNETIC fields ,STRENGTH of materials ,EXCITED states ,DOPPLER effect - Abstract
Lifetimes of excited states of
124 Ba were measured by the Recoil Distance Doppler Shift (RDDS) technique. The γ-ray coincidence data were analysed by the Differential Decay Curve method (DDCM). The trend of the experimentally deduced normalized B(E2) values reveals a drop at the 8+ 1 state, which may be caused by structural changes in the backbending region. [ABSTRACT FROM AUTHOR]- Published
- 2018
17. Search for Isovector Valence-Shell Excitations in 140Nd and 142Sm via Coulomb excitation reactions of radioactive ion beams.
- Author
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Arsenyev, N., Bezbakh, A., Rogov, I., Shneidman, T., Vdovin, A., Kern, Ralph, Stegmann, Robert, Pietralla, Norbert, Rainovski, Georgi, Gaffney, Liam Paul, Blazhev, Andrey, Boukhari, Amar, Cederkäll, Joakim, Cubiss, James, Djongolov, Martin, Fransen, Christoph, Gladnishki, Kalin, Giannopoulos, Efstathios, Hess, Herbert, and Jolie, Jan
- Subjects
NUCLEAR shell theory ,COULOMB excitation ,ION beams ,ELECTROMAGNETIC fields ,SYMMETRY (Physics) - Abstract
Projectile Coulomb excitation experiments were performed at HIE-ISOLDE at CERN with the radioactive ion beams of
140 Nd and142 Sm. Ions with an energy of 4:62 MeV/A were impinging on a 1.45 mg/cm2 thick208 Pb target. The γ-rays depopulating the Coulomb-excited states were recorded by the HPGe-array MINIBALL and scattered particles were detected by a double-sided silicon strip detector. Experimental intensities were used for the determination of electromagnetic transition matrix elements. A preliminary result of the B(M1; 2+ 3 → 2+ 1 ) of140 Nd and an upper limit for the case of142 Sm are revealing the main fragments of the proton-neutron mixed-symmetry 2+ 1;ms states. [ABSTRACT FROM AUTHOR]- Published
- 2018
18. A study on the transition between seniority-type and collective excitations in 204Po and 206Po.
- Author
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Arsenyev, N., Bezbakh, A., Rogov, I., Shneidman, T., Vdovin, A., Stoyanova, Milena, Rainovski, Georgi, Jolie, Jan, Pietralla, Norbert, Blazhev, Andrey, Djongolov, Martin, Esmaylzadeh, Arwin, Gerhard, Lisa, Gladnishki, Kalin, Karayonchev, Vasil, Keatings, James, Kern, Ralph, Kocheva, Diana, Kröll, Thorsten, and Mashtakov, Konstantin
- Subjects
COLLECTIVE excitations ,YRAST states ,EXCITED state energies ,EVAPORATION control ,NUCLEAR reactions ,POLONIUM isotopes - Abstract
Low-lying yrast states in
204 Po and206 Po have been investigated by the γ-γ fast timing technique with LaBr3 (Ce) detectors. Excited states of these nuclei were populated in the197 Au(11 B,4n) and the198 Pt(12 C,4n) fusion-evaporation reactions, respectively, at the FN-Tandem Facility at the University of Cologne. The lifetimes of the 4+ 1 states in both nuclei were measured, along with an upper limit for the 2+ 1 state in204 Po. The preliminary results are discussed in the scope of the systematic behavior of the transition strengths between yrast states in polonium isotopes. [ABSTRACT FROM AUTHOR]- Published
- 2018
19. Nuclear Structure in the region of the doubly-magic $^{100}Sn$
- Author
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Blazhev, Andrey A.
- Subjects
Dissertation - Published
- 2005
20. Proton–proton correlations observed in two-proton radioactivity of 94Ag.
- Author
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Mukha, Ivan, Roeckl, Ernst, Batist, Leonid, Blazhev, Andrey, Döring, Joachim, Grawe, Hubert, Grigorenko, Leonid, Huyse, Mark, Janas, Zenon, Kirchner, Reinhard, La Commara, Marco, Mazzocchi, Chiara, Tabor, Sam L., and Van Duppen, Piet
- Subjects
PROTON-proton interactions ,NUCLEAR reactions ,COLLISIONS (Nuclear physics) ,NUCLEAR energy ,NUCLEAR physics ,RADIOACTIVITY ,RADIATION - Abstract
The stability and spontaneous decay of naturally occurring atomic nuclei have been much studied ever since Becquerel discovered natural radioactivity in 1896. In 1960, proton-rich nuclei with an odd or an even atomic number Z were predicted to decay through one- and two-proton radioactivity, respectively. The experimental observation of one-proton radioactivity was first reported in 1982, and two-proton radioactivity has now also been detected by experimentally studying the decay properties of
45 Fe (refs 3, 4) and54 Zn (ref. 5). Here we report proton–proton correlations observed during the radioactive decay of a spinning long-lived state of the lightest known isotope of silver,94 Ag, which is known to undergo one-proton decay. We infer from these correlations that the long-lived state must also decay through simultaneous two-proton emission, making94 Ag the first nucleus to exhibit one- as well as two-proton radioactivity. We attribute the two-proton emission behaviour and the unexpectedly large probability for this decay mechanism to a very large deformation of the parent nucleus into a prolate (cigar-like) shape, which facilitates emission of protons either from the same or from opposite ends of the ‘cigar’. [ABSTRACT FROM AUTHOR]- Published
- 2006
- Full Text
- View/download PDF
21. In Memoriam: Hubert Grawe (1938–2020).
- Author
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Górska, Magda, Blazhev, Andrey, Gerl, Jürgen, Roeckl, Ernst, and Rudolph, Dirk
- Subjects
- *
NUCLEAR physics , *NUCLEAR shell theory , *NUCLEAR spectroscopy , *NUCLEAR structure , *ATOMIC nucleus - Abstract
Following his studies at the universities of Munich and Freiburg, Hubert received his doctorate in Freiburg at the end of the 1960s under the supervision of Theodor Schmidt. Graph Hubert Grawe It is with deep sadness that we have to inform you that Hubert Grawe passed away suddenly on 8 November 2020 at the age of 82. Hubert followed this research line at the Hahn-Meitner-Institut (HMI) in Berlin, where he first worked on combining solid-state physics and nuclear physics to derive precise nuclear moments. [Extracted from the article]
- Published
- 2021
- Full Text
- View/download PDF
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