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1. Quadrupole moments of high-spin isomers: test of the tilted-axis cranking model

Author

Balabanski, D. L., Vyvey, K., Neyens, G., Almehed, D., Blaha, P., Borremans, D., Chmel, S., Coulier, N., Coussement, R., De Clercq, W., Frauendorf, S., Georgiev, G., Hubel, H., Lepine-Szily, A., Mineva, M., Nenoff, N., Pancholi, S., Rossbach, D., Schwengner, R., Teughels, S., and Walker, P. M.

Subjects
Nuclear Experiment
Abstract

We report the results of recent measurements of the spectroscopic quadrupole moments of high-spin isomers. For the K=35/2- five-quasiparticle isomer in 179W we measured Q_s=4.00(+0.83)(-1.06)eb. It corresponds to a smaller deformation compared to the ground states of the W isotopes and is in disagreement with the current theoretical predictions. We also measured the quadrupole moment of the I=11- isomer in 196Pb, Q_s=(-)3.41(66)eb. It has the same proton s(-2)1/2 h9/2 i13/2 configuration as the one suggested for the I=16- magnetic bandhead which allows to deduce the quadrupole moment of the 16- state as Q_s=-0.316(97)eb. This small value proves the near sphericity of the bandhead., Comment: Contributed paper at "High Spin Physics 2001", see http://www.fuw.edu.pl/~hs2001/, to be published in Acta Physica Polonica B

Published
2001

2. Study of fission fragments produced by 14N + 235U reaction

Author

Yalçinkaya, M., Ganioglu, E., Erduran, M. N., Akkus, B., Bostan, M., Gürdal, G., Ertürk, S., Balabanski, D., Rainovski, G., Danchev, M., Dragomirova, R., Minkova, A., Vyvey, K., Beetge, R., Fearick, R. W., Mabala, G. K., Roux, D. G., Whittaker, W., Babu, B. R. S., Lawrie, J. J., Naguleswaran, S., Newman, R. T., Rigolet, C., Pilcher, J. V., Smith, F. D., Sharpey-Shafer, J. F., Fülöp, Zsolt, editor, Gyürky, György, editor, and Somorjai, Endre, editor

Published
2006
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4. Study of fission fragments produced by 14N + 235U reaction

Author

Yalçınkaya, M., Ganioglu, E., Erduran, M. N., Akkus, B., Bostan, M., Gürdal, G., Ertürk, S., Balabanski, D., Rainovski, G., Danchev, M., Dragomirova, R., Minkova, A., Vyvey, K., Beetge, R., Fearick, R. W., Mabala, G. K., Roux, D. G., Whittaker, W., Babu, B. R. S., Lawrie, J. J., Naguleswaran, S., Newman, R. T., Rigolet, C., Pilcher, J. V., Smith, F. D., and Sharpey-Shafer, J. F.

Published
2006
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6. Slowing down of gamma photons

Author

Coussement, R., Gheysen, S., Serdons, I., Callens, R., Vyvey, K., Shakhmuratov, R. N., Odeurs, J., Mandel, P., Rostovtsev, Y., and Kocharovskaya, O.

Published
2003
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8. Measurement of the g factors of isomers near the proposed N ≈ 40 subshell closure

Author

Georgiev, G., Balabanski, D. L., Bingham, C., Borcea, C., Coulier, N., Coussement, R., Daugas, J. M., Defrance, G., de Oliveira Santos, F., Goldring, G., Górska, M., Grawe, H., Grzywacz, R., Hass, M., O’Leary, C., Lewitowicz, M., Mach, H., Macovei, I., Page, R., Pfützner, M., Penionzkevich, Yu. E., Podolyák, Zs., Regan, P. H., Rykaczewski, K., Sawicka, M., Smirnova, N. A., Sobolev, Yu. G., Stanoiu, M., Teughels, S., Vyvey, K., and Neyens, G.

Published
2001
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13. Spectroscopic quadrupole moments of high-spin isomers in 193 Pb

Author

Balabanski, D. L., Ionescu-Bujor, M., Iordachescu, A., Bazzacco, D., Brandolini, F., Bucurescu, D., Chmel, S., Danchev, M., De Poli, M., Georgiev, G., Haas, H., Hübel, H., Marginean, N., Menegazzo, R., Neyens, G., Pavan, P., Rainovski, G., Rossi Alvarez, C., Ur, C. A., Vyvey, K., and Frauendorf, S.

Published
2003
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14. g-factors of isomeric states in the neutron-rich nuclei

Author

Georgiev, G., Neyens, G., Hass, M., Balabanski, D. L., Bingham, C., Borcea, C., Coulier, N., Coussement, R., Daugas, J. M., de France, G., Górska, M., Grawe, H., Grzywacz, R., Lewitowicz, M., Mach, H., Matea, I., de Oliveira Santos, F., Page, R. D., Pfützner, M., Penionzhkevich, Yu E., Podolyák, Z., Regan, P. H., Rykaczewski, K., Sawicka, M., Smirnova, N. A., Sobolev, Yu, Stanoiu, M., Teughels, S., and Vyvey, K.

Published
2003
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16. Spin, quadrupole moment, and deformation of the magnetic-rotational band head in Pb-193

Author

Balabanski, D.L., Ionescu-Bujor, M., Iordachescu, A., Bazzacco, D., Brandolini, F., Bucurescu, D., Chmel, S., Danchev, M., Poli, M. de, Georgiev, G., Haas, H., Hübel, H., Marginean, N., Menegazzo, R., Neyens, G., Pavan, P., Rossi Alvarez, C., Ur, C.A., Vyvey, K., Frauendorf, S., Instituut voor Kern-en Stralingsfysica (IKS), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (INFN, Sezione di Padova), Istituto Nazionale di Fisica Nucleare (INFN), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (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), and Publica

Subjects
PB-200, NUCLEI, STATES, Nuclear Theory, ISOTOPES, DIPOLE BANDS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], NEUTRON-DEFICIENT PB, SHEARS MECHANISM
Abstract

he spectroscopic quadrupole moment of the T-1/2 = 9.4(5) ns isomer in Pb-193 at an excitation energy E-ex = (2585 + x) keV is measured by the time-differential perturbed angular distribution method as vertical bar Q(s)vertical bar = 2.6(3) e b. Spin and parity I-pi = 27/2(-) are assigned to it based on angular distribution measurements. This state is the band head of a magnetic-rotational band, described by the coupling of a neutron hole in the 1i(13/2) subshell with the (3s(1/2)(-2)1h(9/2)1i(13/2))(11-) proton excitation. The pairing-plus-quadrupole tilted-axis cranking calculations reproduce the measured quadrupole moment with a moderate oblate deformation epsilon(2) = -0.11, similar to that of the 11(-)proton intruder states, which occur in the even-even Pb nuclei in the region. This is the first direct measurement of a quadrupole moment and thus of the deformation of a magnetic-rotational band head.

Published
2011
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17. Spin, quadrupole moment, and deformation of the magnetic-rotational band head in (193)Pb

Author

Balabanski, D L, Ionescu-Bujor, M, Iordachescu, A, Bazzacco, D, Brandolini, F, Bucurescu, D, Chmel, S, Danchev, M, De Poli, M, Georgiev, G, Haas, H, Hubel, H, Marginean, N, Menegazzo, R, Neyens, G, Pavan, P, Rossi Alvarez, C, Ur, C A, Vyvey, K, and Frauendorf, S

Subjects
Nuclear Theory, Nuclear Physics - Experiment
Abstract

The spectroscopic quadrupole moment of the T(1/2) = 9.4(5) ns isomer in (193)Pb at an excitation energy E(ex) = (2585 + x) keV is measured by the time-differential perturbed angular distribution method as vertical bar Q(s)vertical bar = 2.6(3) e b. Spin and parity I(pi) = 27/2(-) are assigned to it based on angular distribution measurements. This state is the band head of a magnetic-rotational band, described by the coupling of a neutron hole in the 1i(13/2) subshell with the (3s(1/2)(-2)1h(9/2)1i(13/2))(11-) proton excitation. The pairing-plus-quadrupole tilted-axis cranking calculations reproduce the measured quadrupole moment with a moderate oblate deformation epsilon(2) = -0.11, similar to that of the 11(-)proton intruder states, which occur in the even-even Pb nuclei in the region. This is the first direct measurement of a quadrupole moment and thus of the deformation of a magnetic-rotational band head.

Published
2011

18. Quadrupole moment of the 8+ yrast state in 84Kr

Author

Schwengner, R., Balabanski, D. L., Neyens, G., Benouaret, N., Borremans, D., Coulier, N., Rydt, M., Georgiev, G., Mallion, S., Rainovski, G., Rusev, G., Teughels, S., and Vyvey, K.

Subjects
level-mixing spectroscopy, nuclear quadrupole moments, shell model, Nuclear structure
Abstract

The quadrupole moment of the 8+ yrast state in 84Kr was measured using the level-mixing spectroscopy technique to be Q = 36(4) efm2. The result is compared with predictions of the shell model using common sets of effective charges. The comparison of experimental quadrupole moments with calculated values for 8+ states in Kr, Sr and Zr isotopes with N = 48, 50 and for 9/2+ states in isotopes with N = 47, 49 suggests a modification of the effective charges used in this region.

Published
2006

19. Quadrupole moments and g factors for high-spin neutron isomers in $^{193}$Pb

Author

Ionescu-Bujor, M., Iordachescu, A., Balabanski, D.L., Chmel, S., Neyens, G., Baldsiefen, G., Bazzacco, D., Brandolini, F., Bucuresu, D., Danchev, M., De Poli, M., Georgiev, G., Görgen, A., Haas, H., Hübel, H., Ilie, G., Marginean, N., Menegazzo, R., Pavan, P., Rainovski, G., Ribas, R.V., Rossi Alvarez, C., Ur, C.A., Vyvey, K., Frauendorf, S., 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), 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.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Physics
Published
2004
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20. Study of fission fragments produced by 14N + 235U reaction

Author

Yalçinkaya, M., primary, Ganioglu, E., additional, Erduran, M. N., additional, Akkus, B., additional, Bostan, M., additional, Gürdal, G., additional, Ertürk, S., additional, Balabanski, D., additional, Rainovski, G., additional, Danchev, M., additional, Dragomirova, R., additional, Minkova, A., additional, Vyvey, K., additional, Beetge, R., additional, Fearick, R. W., additional, Mabala, G. K., additional, Roux, D. G., additional, Whittaker, W., additional, Babu, B. R. S., additional, Lawrie, J. J., additional, Naguleswaran, S., additional, Newman, R. T., additional, Rigolet, C., additional, Pilcher, J. V., additional, Smith, F. D., additional, and Sharpey-Shafer, J. F., additional

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21. g-factors of isomeric states in the neutron-rich nuclei

Author

Georgiev, G., Neyens, G., Hass, M., Balabanski, D.L., Bingham, C., Borcea, C., Coulier, N., Coussement, R., Daugas, J.M., de France, G., Gorska, M., Grawe, H., Grzywacz, R., Lewitowicz, M., Mach, H., Matea, I., de Oliveira Santos, Francois, Page, R.D., Pfutzner, M., Penionzhkevich, Yu. E., Podolyak, Z., Regan, P.H., Rykaczewski, K., Sawicka, M., Smirnova, N.A., Sobolev, Yu., Stanoiu, M., Teughels, S., Vyvey, K., 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), 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), and Lion, Michel

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2002

22. Spectroscopic quadrupole moments of high-spin isomers in $^{193}$Pb

Author

Balabanski, D.L., Ionescu-Bujor, M., Iordachescu, A., Bazzacco, D., Brandolini, F., Bucurescu, D., Chmel, S., Danchev, M., De Poli, M., Georgiev, G., Haas, H., Hubel, H., Marginean, N., Mengazzo, R., Neyens, G., Pavan, P., Rainovski, G., Rossi Alvarez, C., Ur, C.A., Vyvey, K., Frauendorf, S., 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), Lion, Michel, 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], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2002

23. g-factor measurements of isomeric states in neutron rich nuclei

Author

Georgi Georgiev, Neyens, G., Hass, M., Balabanski, D. L., Bingham, C., Borcea, C., Coulier, N., Coussement, R., Daugas, J. M., France, G., Santos, F. D., Gorska, M., Grawe, H., Grzywacz, R., Lewitowicz, M., Mach, H., Matea, I., Page, R. D., Pfutzner, M., Penionzhkevich, Y. E., Podolyak, Z., Regan, P. H., Rykaczewski, K., Sawicka, M., Smirnova, N. A., Sobolev, Y., Stanoiu, M., Teughels, S., Vyvey, K., Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Electromagnet, Magnetic moment, Spectrometer, Isotope, 020206 networking & telecommunications, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], law.invention, Magnetic field, Nuclear physics, Microsecond, law, Nuclear magnetic moment, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Neutron, Atomic physics, Nuclear Experiment
Abstract

We report on the first application of the TDPAD method to measure the g factor of neutron‐rich isomeric states, produced and aligned in a projectile fragmentation reaction. The feasibility of similar measurement opens up a new, unexplored region of the nuclear chart for studies of the magnetic moments of microsecond isomers. Nuclei around 68Ni were produced following the fragmentation of 61.6 MeV/u 76Ge on a 145 mg/cm2 Be target. The isotopes of interest were selected using the LISE spectrometer at GANIL, Caen, France, and were implanted in a high purity Cu foil fixed between the poles of an electromagnet. Two Ge Clover detectors, positioned in a plane perpendicular to the holding magnetic field, were used to observe the rotation of the nuclear spin ensemble and to derive the experimental R(t) function. The experimental result for the isomer in 67Ni (Jπ = 9/2+, T1/2 = 13.3 μs, Ex = 1007 keV), |g| = 0.125(6), is presented herein and is also compared to the theoretical expectations.

Published
2002
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24. Spin polarization of $^{27}$Na and $^{31}$Al in intermediate energy projectile fragmentation of $^{36}$S

Author

Borremans, D., Daugas, J.M., Teughels, S., Balabanski, D.L., Coulier, N., de Oliveira Santos, Francois, Georgiev, G., Hass, M., Lewitowicz, M., Matea, I., Penionzhkevich, Yu.E., Schmidt-Ott, W.-D., Sobolev, Yu.E., Stanoiu, M., Vyvey, K., Neyens, G., 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), 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.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2002
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25. Gyromagnetic factors of isomers in the neutron-rich N=40 region: the case of $^{69}$Cu

Author

Georgiev, G., Neyens, G., Balabanski, D.L., Bingham, C., Borcea, C., Coulier, N., Coussement, R., Daugas, J.M., De France, G., Goldring, G., Gorska, M., Grawe, H., Grzywacz, R., Hass, M., Lewitowicz, M., Mach, H., Matea, I., de Oliveira Santos, Francois, Page, R.D., Pfuetzner, M., Penionzhkevich, Yu.E., Podolyak, Zs., Regan, P.H., Rykaczewski, K., Sawicka, M., Smirnova, N.A., Sobolev, Yu., Stanoiu, M., Teughels, S., Vyvey, K., Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Casten R., Jan Jolie, Kneissl U., Lieb P., 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), Lion, Michel, and Casten R., Jan Jolie, Kneissl U., Lieb P.

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2001

28. Static Quadrupole Moment of the Five-Quasiparticle K=35/2 Isomer in 179W Studied with the Level-Mixing Spectroscopy Method

Author

Balabanski, D. L., Vyvey, K., Neyens, G., Coulier, N., Coussement, R., Georgiev, G., Lépine-Szily, A., Ternier, S., Teughels, S., Mineva, M., Walker, P. M., Blaha, P., Almehed, D., and Frauendorf, S.

Abstract

The spectroscopic quadrupole moment of the high-spin, high-K five-quasiparticle isomer (Kπ=[(35-)/2],T1/2=750(80) ns, Ei = 3349 keV) in 179W has been determined using the level mixing spectroscopy method. A value Qs = 4.00([(+0.83) || (-1.06)])e b was derived, which corresponds to an intrinsic quadrupole moment Q0 = 4.73([(+0.98) || (-1.25)])e b and to a quadrupole deformation β2 = 0.185([(+0.038) || (-0.049)]). These values differ significantly from the deduced ground-state quadrupole moments and are in disagreement with the current theoretical predictions in this mass region.

Published
2001

29. g-factors of isomers around N $\approx$ 40, Z $\approx$ 28 from time-dependent Larmir precession on spin-aligned projectile-like fragments

Author

Neyens, G., Georgiev, G., Grzywacz, R., Hass, M., de Oliveira Santos, Francois, Lewitowicz, M., Balabanski, D.L., Bingham, C., Borcea, C., Coulier, N., Coussement, R., Daugas, J.M., De France, G., Goldring, G., Gorska, M., Grawe, H., O'Leary, C., Macovei, I., Mach, H., Page, R., Pfutzner, M., Penionskhevich, Yu.-E., Sawicka, M., Smirnova, N.A., Sobolev, Yu., Teughels, S., Vyvey, K., Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Lion, Michel, 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], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2000

30. Nuclear spin alignment and quadrupole moment of light projectile fragment studies with the level mixing resonance (LMR0 method

Author

Neyens, G., Coulier, N., Ternier, S., Vyvey, K., Cossement, R., Balabanski, D., Casandjian, J.M., Chartier, M., Cortina-Gil, M.D., Lewitowicz, M., Mittig, W., Ostrowski, A.N., Roussel-Chomaz, P., Alamanos, N., Lepine-Szily, A., 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), Bertulani C.A. Felipe Canto L. Mahir S. Hussein, and Lion, Michel

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
1996

31. Isomer shift determination in Eu compounds using stroboscopic detection of synchrotron radiation

Author

UCL, Serdons, I., Nasu, S., Callens, R., Coussement, R., Kawakami, T, Ladriere, J., Morimoto, S., Ono, T, Vyvey, K, Yamada, T, Yoda, Y., Odeurs, J., UCL, Serdons, I., Nasu, S., Callens, R., Coussement, R., Kawakami, T, Ladriere, J., Morimoto, S., Ono, T, Vyvey, K, Yamada, T, Yoda, Y., and Odeurs, J.

Abstract

The first application of stroboscopic detection of nuclear resonant scattering with synchrotron radiation on Eu-151 is reported. It is shown that stroboscopic detection is a useful technique for the determination of isomer shifts and this is confirmed by a measurement of the isomer shift of Eu-151 in EuPd2Si2 at pressures ranging from ambient pressure to 5 GPa. The results are compared with previous measurements.

Published
2004

32. Quadrupole moments and g factors for high-spin neutron isomers in Pb-193

Author

Ionescu-Bujor, M., Iordachescu, A., Balabanski, D. L., Chmel, S., Neyens, G., Baldsiefen, G., Bazzacco, D., Brandolini, F., Bucurescu, D., Danchev, M., Poli, M., Georgiev, G., Grogen, A., Haas, H., Hubel, H., Ilie, G., Marginean, N., Menegazzo, R., Pavan, P., Rainovski, G., Ribas, R. V., Alvarez, C. R., Ur, C. A., Vyvey, K., Frauendorf, S., Ionescu-Bujor, M., Iordachescu, A., Balabanski, D. L., Chmel, S., Neyens, G., Baldsiefen, G., Bazzacco, D., Brandolini, F., Bucurescu, D., Danchev, M., Poli, M., Georgiev, G., Grogen, A., Haas, H., Hubel, H., Ilie, G., Marginean, N., Menegazzo, R., Pavan, P., Rainovski, G., Ribas, R. V., Alvarez, C. R., Ur, C. A., Vyvey, K., and Frauendorf, S.

Abstract

The g factors and quadrupole moments of the 21/2(-) and 33/2(+) isomers in Pb-193 have been measured by the time-differential perturbed gamma-ray angular distribution method as g(21/2(-))=-0.059(11), \Q(21/2(-))\=0.22(2) eb and g(33/2(+))=-0.171(9), parallel toQ(33/2(+))\=0.45(4) eb. The results support the three-neutron configurations (1i(13/2))(12)(+2)x3p(3/2) and (1i(13/2))(3) for the 21/2(-) and 33/2(+) states, respectively. The quadrupole moment of the 12(+) isomer in Pb-194 described by the two-neutron (1i(13/2))(2) configuration has been remeasured as \Q(12(+))\=0.48(3) eb in perfect agreement with the previous data. The experimental results are discussed within a microscopic Bardeen-Cooper-Schrieffer approach in a number-projected one- and three-quasiparticle neutron space, and in the frame of the pairing plus quadrupole tilted-axis cranking model.

Published
2004

33. Spin, quadrupole moment, and deformation of the magnetic-rotational band head inPb193

Author

Balabanski, D. L., primary, Ionescu-Bujor, M., additional, Iordachescu, A., additional, Bazzacco, D., additional, Brandolini, F., additional, Bucurescu, D., additional, Chmel, S., additional, Danchev, M., additional, De Poli, M., additional, Georgiev, G., additional, Haas, H., additional, Hübel, H., additional, Marginean, N., additional, Menegazzo, R., additional, Neyens, G., additional, Pavan, P., additional, Rossi Alvarez, C., additional, Ur, C. A., additional, Vyvey, K., additional, and Frauendorf, S., additional

Published
2011
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34. Principles of stroboscopic detection of nuclear forward-scattered synchrotron radiation

Author

UCL, Callens, R., Coussement, R., Kawakami, T, Ladrière, Jean, Nasu, S., Ono, T, Serdons, I., Vyvey, K, Yamada, T, Yoda, Y., Odeurs, J., UCL, Callens, R., Coussement, R., Kawakami, T, Ladrière, Jean, Nasu, S., Ono, T, Serdons, I., Vyvey, K, Yamada, T, Yoda, Y., and Odeurs, J.

Abstract

The basic principles of stroboscopic detection of nuclear resonant forward-scattered synchrotron radiation are discussed. It is explained how the experiment can be configured in such a way that energy-resolved spectra with a straightforward interpretation are obtained. The theory is supported by a set of experimental spectra on the single-line compound potassium ferrocyanide trihydrate. Further, it is shown that a stroboscopic measurement is equivalent to an interferometer experiment. Finally, a comparison of stroboscopic detection and other Mossbauer techniques is given.

Published
2003

35. Slowing Down of Gamma Photons

Author

Coussement, Romain, Gheysen, S., Serdons, I., Callens, R., Vyvey, K., Shakhmuratov, Rustem, Odeurs, Jos, Mandel, Paul, Rostovtsev, Yuri, Kocharovskaya, Olga, Coussement, Romain, Gheysen, S., Serdons, I., Callens, R., Vyvey, K., Shakhmuratov, Rustem, Odeurs, Jos, Mandel, Paul, Rostovtsev, Yuri, and Kocharovskaya, Olga

Abstract

SCOPUS: re.j, info:eu-repo/semantics/published

Published
2003

36. Principles of stroboscopic detection of nuclear forward-scattered synchrotron radiation

Author

Callens, R., Coussement, Romain, Kawakami, Takashi, Ladrière, Jean, Nasu, Saburo, Ono, Teruo, Serdons, I., Vyvey, K., Yamada, Takahiro, Yoda, Yoshitaka, Odeurs, Jos, Callens, R., Coussement, Romain, Kawakami, Takashi, Ladrière, Jean, Nasu, Saburo, Ono, Teruo, Serdons, I., Vyvey, K., Yamada, Takahiro, Yoda, Yoshitaka, and Odeurs, Jos

Abstract

The basic principles of stroboscopic detection of nuclear resonant forward-scattered synchrotron radiation are discussed. It is explained how the experiment can be configured in such a way that energy-resolved spectra with a straightforward interpretation are obtained. The theory is supported by a set of experimental spectra on the single-line compound potassium ferrocyanide trihydrate. Further, it is shown that a stroboscopic measurement is equivalent to an interferometer experiment. Finally, a comparison of stroboscopic detection and other Mössbauer techniques is given., SCOPUS: ar.j, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2003

37. Controlling absorption of gamma radiation via nuclear level anticrossing

Author

Coussement, Romain, Rostovtsev, Yuri, Odeurs, Jos, Neyens, G., Muramatsu, Hisakazu, Gheysen, S., Callens, R., Vyvey, K., Kozyreff, Gregory, Mandel, Paul, Shakhmuratov, Rustem, Kocharovskaya, O., Coussement, Romain, Rostovtsev, Yuri, Odeurs, Jos, Neyens, G., Muramatsu, Hisakazu, Gheysen, S., Callens, R., Vyvey, K., Kozyreff, Gregory, Mandel, Paul, Shakhmuratov, Rustem, and Kocharovskaya, O.

Abstract

A significant reduction of absorption for single gamma photons has been experimentally observed by studying Mössbauer spectra of 57Fe in a FeCO3 crystal. The experimental results have been explained in terms of a quantum interference effect involving nuclear level anticrossing due to the presence of a combined magnetic dipole and electric quadrupole interaction., Journal Article, info:eu-repo/semantics/published

Published
2002

38. Induced transparency for gamma radiation via nuclear level mixing

Author

Odeurs, Jos, Coussement, Romain, Vyvey, K., Muramatsu, Hisakazu, Gheysen, S., Callens, R., Neyens, Gerda, Serdons, I., Shakhmuratov, Rustem, Rostovtsev, Yuri, Kocharovskaya, Olga, Odeurs, Jos, Coussement, Romain, Vyvey, K., Muramatsu, Hisakazu, Gheysen, S., Callens, R., Neyens, Gerda, Serdons, I., Shakhmuratov, Rustem, Rostovtsev, Yuri, and Kocharovskaya, Olga

Abstract

A significant reduction of absorption of single gamma photons has been observed using the Mössbauer spectra of 57Fe in a FeCO3 crystal. The absorption deficit can be ascribed to partially destructive interference for absorption because of two indistinguishable absorption paths. The necessary coherence is created by means of level mixing produced by a suitable combination of a magnetic dipole and electric quadrupole interaction., SCOPUS: cp.j, info:eu-repo/semantics/published

Published
2002

39. Quadrupole Moment of the 11- Intruder Isomer in 196Pb and Its Implications for the 16- Shears Band Head

Author

Vyvey, K., Chmel, S., Neyens, G., Hübel, H., Balabanski, D. L., Borremans, D., Coulier, N., Coussement, R., Georgiev, G., Nenoff, N., Pancholi, S., Rossbach, D., Schwengner, R., Teughels, S., Frauendorf, S., Vyvey, K., Chmel, S., Neyens, G., Hübel, H., Balabanski, D. L., Borremans, D., Coulier, N., Coussement, R., Georgiev, G., Nenoff, N., Pancholi, S., Rossbach, D., Schwengner, R., Teughels, S., and Frauendorf, S.

Abstract

The quadrupole moment of the 11- isomer in 196Pb has been measured by the level mixing spectroscopy method. This state has a pi (3s_1/2^-2 1h_9/2 1i_13/2)11- configuration which is involved in most of the shears band heads in the Pb region. The first directly measured value of Qs(11-) = (-) 3.41(66) b, coupled to the previously known quadrupole moment of the nu (1i_13/2 )12+ isomer allows us to estimate the quadrupole moment of the 16- shears band head as Qs(16-) = -0.32(10) b. The experimental values are compared to tilted axis cranking calculations, giving insight into the validity of the additivity approach to couple quadrupole moments and on the amount of deformation in the shears bands.

Published
2002

40. Stroboscopic detection of nuclear forward-scattered synchrotron radiation

Author

Callens, R., Coussement, Romain, L’abbé, C., Nasu, Saburo, Vyvey, K., Yamada, Takahiro, Yoda, Yoshitaka, Odeurs, Jos, Callens, R., Coussement, Romain, L’abbé, C., Nasu, Saburo, Vyvey, K., Yamada, Takahiro, Yoda, Yoshitaka, and Odeurs, Jos

Abstract

Stroboscopic detection of nuclear forward-scattered synchrotron radiation is proposed and applied. Stroboscopic measurements provide energy-resolved spectra and relax the condition on the bunch mode. This concept is applied to study the magnetism in (formula presented) under high pressure. © 2002 The American Physical Society., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2002

42. Quadrupole moment of the8+yrast state inKr84

Author

Schwengner, R., primary, Balabanski, D. L., additional, Neyens, G., additional, Benouaret, N., additional, Borremans, D., additional, Coulier, N., additional, Rydt, M. De, additional, Georgiev, G., additional, Mallion, S., additional, Rainovski, G., additional, Rusev, G., additional, Teughels, S., additional, and Vyvey, K., additional

Published
2006
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43. Study of the static quadrupole moment of the K=35/2 isomer in 179W

Author

Vyvey, K, Neyens, G, Balabanski, D, Ternier, S, Coulier, N, Teughels, S, Gauga, Irina, Wyckmans, R, Coussement, R, Mineva, M, Walker, Philip M, Byrne, Aidan, Dracoulis, George, Blaha, Charles D., Vyvey, K, Neyens, G, Balabanski, D, Ternier, S, Coulier, N, Teughels, S, Gauga, Irina, Wyckmans, R, Coussement, R, Mineva, M, Walker, Philip M, Byrne, Aidan, Dracoulis, George, and Blaha, Charles D.

Published
1999

45. Quadrupole moments andgfactors for high-spin neutron isomers inPb193

Author

Ionescu-Bujor, M., primary, Iordachescu, A., additional, Balabanski, D. L., additional, Chmel, S., additional, Neyens, G., additional, Baldsiefen, G., additional, Bazzacco, D., additional, Brandolini, F., additional, Bucurescu, D., additional, Danchev, M., additional, De Poli, M., additional, Georgiev, G., additional, Görgen, A., additional, Haas, H., additional, Hübel, H., additional, Ilie, G., additional, Marginean, N., additional, Menegazzo, R., additional, Pavan, P., additional, Rainovski, G., additional, Ribas, R. V., additional, Rossi Alvarez, C., additional, Ur, C. A., additional, Vyvey, K., additional, and Frauendorf, S., additional

Published
2004
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50. gfactor measurements of s isomeric states in neutron-rich nuclei around68Ni produced in projectile-fragmentation reactions

Author

Georgiev, G, primary, Neyens, G, additional, Hass, M, additional, Balabanski, D L, additional, Bingham, C, additional, Borcea, C, additional, Coulier, N, additional, Coussement, R, additional, Daugas, J M, additional, France, G De, additional, Santos, F de Oliveira, additional, G rska, M, additional, Grawe, H, additional, Grzywacz, R, additional, Lewitowicz, M, additional, Mach, H, additional, Matea, I, additional, Page, R D, additional, Pf tzner, M, additional, Penionzhkevich, Yu E, additional, Podoly k, Z, additional, Regan, P H, additional, Rykaczewski, K, additional, Sawicka, M, additional, Smirnova, N A, additional, Sobolev, Yu G, additional, Stanoiu, M, additional, Teughels, S, additional, and Vyvey, K, additional

Published
2002
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