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17 results on '"Braunroth Th."'

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

Author

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

Subjects
Physics, QC1-999
Abstract

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

Published
2016
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2. A revised $B(E2; 2^+_1 \to 0^+_1)$ value in the semi-magic nucleus $^{210}$Po

Author

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

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

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

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

Author

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

Abstract

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

Published
2024

4. 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

5. 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

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

Author

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

Published
2018
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7. Low collectivity of the 2(1)(+) state of Po-212

Author

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

Abstract

The lifetime of the 2(1)(+) state of Po-212 was measured in the Pb-208(C-12, Be-8)Po-212 transfer reaction by gamma-ray spectroscopy employing the recoil distance Doppler shift (RDDS) method. The derived absolute B(E2) value of 2.6(3) W.u. indicates a low collectivity and contradicts previous claims of alpha-cluster components in the structure of the 2(1)(+) state. It is demonstrated that a consistent description of the properties of the 2(1)(+)-4(1)(+)-6(1)(+)-8(1)(+) sequence in Po-212 cannot be achieved in the framework of a single-j shell-model calculation, either. This puzzle is traced to the properties of the seniority-2 configurations in Pb-210 and Po-210.

Published
2017

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

Author

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

Abstract

The lifetimes of the 2(1)(+), the 2(2)(+) and the 3-1 states of Po-210 have been measured in the Pb-208(C-12, Be-10)Po-210 transfer reaction by the Doppler-shift attenuation method. The result for the lifetime of the 2(1)(+) state is about three times shorter than the adopted value. However, the new value still does not allow for a consistent description of the properties of the yrast 2(1)(+), 4(1)(+), 6(1)(+), and 8(1)(+) states of Po-210 in the framework of nuclear shell models. Quasi-particle Phonon Model (QPM) calculations also cannot overcome this problem thus indicating the existence of a peculiarity which is neglected in both theoretical approaches.

Published
2017

9. 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

10. 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
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11. 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
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12. 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

13. Low-lying isovector 2(+) valence-shell excitations of Po-212

Author

Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Stahl, C., 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., Mueller-Gatermann, C., Scheck, M., Scholz, Ph., Stegmann, R., Thoele, P., Werner, V., Witt, W., Woelk, D., Van Isacker, P., Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Stahl, C., 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., Mueller-Gatermann, C., Scheck, M., Scholz, Ph., Stegmann, R., Thoele, P., Werner, V., Witt, W., Woelk, D., and Van Isacker, P.

Abstract

We present the results from an experiment dedicated to search for quadrupole-collective isovector valence-shell excitations, states with so-called mixed proton-neutron symmetry (MSS), of Po-212. This nucleus was studied in an a-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 qualitative agreement with a simple single-j shell model calculation, which, together with the observed lack of quadrupole collectivity, indicates that the isovector nature of low-lying states is a property of the leading single-particle valence shell configuration.

Published
2016

14. Search for mixed-symmetry states in212Po

Author

Kocheva, D., primary, Rainovski, G., additional, Jolie, J., additional, Pietralla, N., additional, Stahl, C., additional, Petkov, P., additional, Blazhev, A., additional, Hennig, A., additional, Astier, A., additional, Braunroth, Th., additional, Cortes, L., additional, Dewald, A., additional, Djongolov, M., additional, Fransen, C., additional, Gladnishki, K., additional, Karayonchev, V., additional, Litzinger, J., additional, Müller-Gatermann, C., additional, Scheck, M., additional, Scholz, Ph., additional, Schramm, C., additional, Tölle, P., additional, Werner, V., additional, Witt, W., additional, Wölk, D., additional, and Van Isacker, P., additional

Published
2016
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15. Low-lying isovector2+valence-shell excitations ofPo212

Author

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

Published
2016
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16. Search formixed-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., and Lettmann, M.

Subjects
QUADRUPOLES, ELECTROMAGNETIC theory, QUADRUPOLE moments, NEUTRON-proton interactions, NUCLEAR reactions, PARTICLE interactions
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. [ABSTRACT FROM AUTHOR]

Published
2016
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17. A revised B(E2;2 $ \rightarrow$ 0 ) value in the semi-magic nucleus Po.

Author

Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Astier, A., Altenkirch, R., Ansari, S., Braunroth, Th., Cortés, M., Dewald, A., Diel, F., Djongolov, M., Fransen, C., Gladnishki, K., Hennig, A., Karayonchev, V., Keatings, J., Kluge, E., and Litzinger, J.

Subjects
ELECTRON-nucleus scattering, CHARGE transfer, DOPPLER effect, PHONONS, QUASIPARTICLES
Abstract

The lifetimes of the $ 2^+_1$ , the $ 2^+_2$ and the $ 3^-_1$ states of Po have been measured in the Pb(C,Be)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 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. [ABSTRACT FROM AUTHOR]

Published
2017
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