Search

Your search keyword '"Nyakó, B. M."' showing total 196 results
Start Over Author "Nyakó, B. M."
196 results on '"Nyakó, B. M."'

1. Evidence for enhanced neutron-proton correlations from the level structure of the $N=Z+1$ nucleus $^{87}_{43}$Tc$^{\ }_{44}$

Author

Liu, X., Cederwall, B., Qi, C., Wyss, R. A., Aktas, Ö., Ertoprak, A., Zhang, W., Clément, E., de France, G., Ralet, D., Gadea, A., Goasduff, A., Jaworski, G., Kuti, I., Nyakó, B. M., Nyberg, J., Palacz, M., Wadsworth, R., Valiente-Dobón, J. J., Al-Azri, H., Nyberg, A. Ataç, Bäck, T., de Angelis, G., Doncel, M., Dudouet, J., Gottardo, A., Jurado, M., Ljungvall, J., Mengoni, D., Napoli, D. R., Petrache, C. M., Sohler, D., Timár, J., Barrientos, D., Bednarczyk, P., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Burrows, I., Charles, L., Ciemala, M., Crespi, F. C. L., Cullen, D. M., Désesquelles, P., Domingo-Pardo, C., Eberth, J., Erduran, N., Ertürk, S., González, V., Goupil, J., Hess, H., Huyuk, T., Jungclaus, A., Korten, W., Lemasson, A., Leoni, S., Maj, A., Menegazzo, R., Million, B., Perez-Vidal, R. M., Podolyàk, Zs., Pullia, A., Recchia, F., Reiter, P., Saillant, F., Salsac, M. D., Sanchis, E., Simpson, J., Stezowski, O., Theisen, C., and Zielińska, M.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The low-lying excited states in the neutron-deficient $N=Z+1$ nucleus $^{87}_{43}$Tc$^{\ }_{44}$ have been studied via the fusion-evaporation reaction $^{54}$Fe($^{36}$Ar, $2n1p$)$^{87}$Tc at the Grand Acc\'el\'erateur National d'Ions Lourds (GANIL), France. The AGATA spectrometer was used in conjunction with the auxiliary NEDA, Neutron Wall, and DIAMANT detector arrays to measure coincident prompt $\gamma$-rays, neutrons, and charged particles emitted in the reaction. A level scheme of $^{87}$Tc from the (9/2$^{+}_{g.s.}$) state to the (33/2$^{+}_{1}$) state was established based on 6 mutually coincident $\gamma$-ray transitions. The constructed level structure exhibits a rotational behavior with a sharp backbending at $\hbar\omega\approx 0.50$ MeV. A decrease in alignment frequency and increase in alignment sharpness in the odd-mass isotonic chains around $N=44$ is proposed as an effect of the enhanced isoscalar neutron-proton interactions in odd-mass nuclei when approaching the $N=Z$ line.

Published
2021

2. A new anomaly observed in $^4$He supports the existence of the hypothetical X17 particle

Author

Krasznahorkay, A. J., Csatlós, M., Csige, L., Gulyás, J., Krasznahorkay, A., Nyakó, B. M., Rajta, I., Timár, J., Vajda, I., and Sas, N. J.

Subjects
Nuclear Experiment, F.2.2
Abstract

Energy-sum and angular correlation spectra of $e^+e^-$ pairs produced in the $^{3}$H(p,$\gamma$)$^{4}$He nuclear reaction have been studied at $E_p$=510, 610 and 900 keV proton energies. The main features of the spectra can be understood by taking into account the internal and external pair creations following the direct proton radiative capture by $^{3}$H. However, these processes cannot account for the observed peak around 115$^\circ$ in the angular correlation spectra. This anomalous excess of $e^+e^-$ pairs can be described by the creation and subsequent decay of a light particle during the direct capture process. The derived mass of the particle is $m_\mathrm{X}c^2$=16.94$\pm0.12 (stat) \pm 0.21 (syst)$~MeV. According to the mass and branching ratio ($B_x=5.1(13)\times10^{-6}$), this is likely the same X17 particle, which we recently suggested [Phys. Rev. Lett. 116, 052501 (2016)] for describing the anomaly observed in the decay of $^8$Be., Comment: 5 pages, 4 figures. arXiv admin note: text overlap with arXiv:1910.10459

Published
2021
Full Text
View/download PDF

3. Medium-spin states of the neutron-rich nucleus $^{87}$Br

Author

Nyakó, B. M., Timár, J., Csatlós, M., Dombrádi, Zs., Krasznahorkay, A., Kuti, I., Sohler, D., Tornyi, T. G., Czerwiński, M., Rzcaca-Urban, T., Urban, W., Bcaczyk, P., Atanasova, L., Balabanski, D. L., Sieja, K., Blanc, A., Jentschel, M., Köster, U., Mutti, P., Soldner, T., de France, G., Simpson, G. S., and Ur, C. A.

Subjects
Nuclear Experiment
Abstract

Medium-spin excited states of the neutron-rich nucleus $^{87}$Br were observed and studied for the first time. They were populated in fission of $^{235}$U induced by the cold-neutron beam of the PF1B facility of the Institut Laue-Langevin, Grenoble. The measurement of $\gamma$ radiation following fission has been performed using the EXILL array of Ge detectors. The observed level scheme was compared with results of large valence space shell model calculations. The medium-spin level scheme consists of three band-like structures, which can be understood as bands built on the ${\pi}f_{5/2}$, ${\pi}(p_{3/2}+f_{5/2})$ and ${\pi}g_{9/2}$ configurations. The behavior of the observed ${\pi}g_{9/2}$ band at high spins shows a considerable deviation from the shell model predictions. This deviation in this band is probably the result of an increased collectivity, which can be understood assuming that the ${\pi}g_{9/2}$ high-$\it j$ proton polarizes the core.

Published
2021
Full Text
View/download PDF

4. First candidates for {\gamma} vibrational bands built on the [505]11/2- neutron orbital in odd-A Dy isotopes

Author

Majola, S. N. T., Sithole, M. A., Mdletshe, L., Hartley, D., Timar, J., Nyako, B. M., Allmond, J. M., Bark, R. A., Beausang, C., Bianco, L., Bucher, T. D., Bvumbi, S. P., Carpenter, M. P., Chiara, C. J., Cooper, N., Cullen, D. M., Curien, D., Dinoko, T. S., Gall, B. J. P., Garrett, P. E., Greenlees, P. T., Hirvonen, J., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kheswa, B. V., Kondev, F. G., Korichi, A., Kulp, W. D., Lauritsen, T., Lawrie, E. A., Makhathini, L., Masiteng, P. L., Maqabuka, B., Mccutchan, E. A., Miller, D., Miller, S., Minkova, A., Msebi, L., Mthembu, S. H., Ndayishimye, J., Nieminen, P., Ngcobo, P. Z., Ntshangase, S. S., Orce, J. N., Peura, P., Rahkila, P., Redon, N., Riedinger, L. L., Riley, M. A., Roux, D. G., Ruotsalainen, P., Piot, J., Saren, J., Sharpey-Schafer, J. F., Scholey, C., Shirinda, O., Simpson, J., Sorri, J., Stefanescu, I., Stolze, S., Uusitalo, J., Wang, X., Werner, V., Wood, J. L., Yu, C. H., Zhu, S., and Zimba, G.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Rotational structures have been measured using the Jurogam II and GAMMASPHERE arrays at low spin following the 155Gd({\alpha},2n)157Dy and 148Nd(12C, 5n)155Dy reactions at 25 and 65 MeV, respectively. We report high-K bands, which are conjectured to be the first candidates of a K{\pi}= 2+ {\gamma} vibrational band, built on the [505]11/2- neutron orbital, in both odd-A 155, 157Dy isotopes. The coupling of the first excited K=0+ states or the so-called \b{eta} vibrational bands at 661 and 676 keV in 154Dy and 156Dy to the [505]11/2- orbital, to produce a K{\pi}=11/2- band, was not observed in both 155Dy and 157Dy, respectively. The implication of these findings on the interpretation of the first excited 0+ states in the core nuclei 154Dy and 156Dy are also discussed., Comment: Published in Physical Rev C

Published
2020
Full Text
View/download PDF

5. Spectroscopy of low spin states in 157Dy: Search for evidence of enhanced octupole correlations

Author

Majola, S. N. T., Bark, R. A., Bianco, L., Bucher, T. D., Bvumbi, S. P., Cullen, D. M., Garrett, P. E., Greenlees, P. T., Hartley, D., Hirvonen, J, Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kheswa, B. V., Korichi, A., Lawrie, E. A., Masiteng, P. L., Maqabuka, B., Mdletshe, L., Minkova, A., Ndayishimye, J., Nieminen, P., Newman, R., Nyako, B. M., Ntshangase, S. S., Peura, P., Rahkila, P., Riedinger, L. L., Riley, M., Roux, D., Ruotsalainen, P., Saren, J., Sharpey-Schafer, J. F., Scholey, C., Shirinda, O., Sithole, A., Sorri, J., Stolze, S., Timar, J., Uusitalo, J., and Zimba, G.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Low-spin states of 157Dy have been studied using the JUROGAM II array, following the 155Gd ({\alpha}, 2n) reaction at a beam energy of 25 MeV. The level scheme of 157Dy has been expanded with four new bands. Rotational structures built on the [523]5/2- and [402]3/2+ neutron orbitals constitute new additions to the level scheme as do many of the inter- and intra-band transitions. This manuscript also reports the observation of cross I- to (I-1)- and I- to (I-1)+ E1 dipole transitions inter-linking structures built on the [523]5/2- (band 5) and [402]3/2+ (band 7) neutron orbitals. These interlacing band structures are interpreted as the bands of parity doublets with simplex quantum number s = -i related to possible octupole correlations., Comment: Published in Physical Review C (2019)

Published
2020
Full Text
View/download PDF

6. Experimental Evidence for Transverse Wobbling in $^{105}$Pd

Author

Timár, J., Chen, Q. B., Kruzsicz, B., Sohler, D., Kuti, I., Zhang, S. Q., Meng, J., Joshi, P., Wadsworth, R., Starosta, K., Algora, A., Bednarczyk, P., Curien, D., Dombrádi, Zs., Duchêne, G., Gizon, A., Gizon, J., Jenkins, D. G., Koike, T., Krasznahorkay, A., Molnár, J., Nyakó, B. M., Paul, E. S., Rainovski, G., Scheurer, J. N., Simons, A. J., Vaman, C., and Zolnai, L.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

New rotational bands built on the $\nu$$(h_{11/2})$ configuration have been identified in $^{105}$Pd. Two bands built on this configuration show the characteristics of transverse wobbling: the $\Delta$$I$=1 transitions between them have a predominant E2 component and the wobbling energy decreases with increasing spin. The properties of the observed wobbling bands are in good agreement with theoretical results obtained using constrained triaxial covariant density functional theory and quantum particle rotor model calculations. This provides the first experimental evidence for transverse wobbling bands based on a one-neutron configuration, and also represents the first observation of wobbling motion in the $A$$\sim$100 mass region.

Published
2019
Full Text
View/download PDF

7. Observation of Anomalous Internal Pair Creation in $^8$Be: A Possible Signature of a Light, Neutral Boson

Author

Krasznahorkay, A. J., Csatlós, M., Csige, L., Gácsi, Z., Gulyás, J., Hunyadi, M., Ketel, T. J., Krasznahorkay, A., Kuti, I., Nyakó, B. M., Stuhl, L., Timár, J., Tornyi, T. G., and Vajta, Zs.

Subjects
Nuclear Experiment
Abstract

Electron-positron angular correlations were measured for the isovector magnetic dipole 17.6 MeV state ($J^\pi=1^+$, $T=1$) $\rightarrow$ ground state ($J^\pi=0^+$, $T=0$) and the isoscalar magnetic dipole 18.15 MeV ($J^\pi=1^+$, $T=0$) state $\rightarrow$ ground state transitions in $^{8}$Be. Significant deviation from the internal pair creation was observed at large angles in the angular correlation for the isoscalar transition with a confidence level of $> 5\sigma$. This observation might indicate that, in an intermediate step, a neutral isoscalar particle with a mass of 16.70$\pm0.35 $ (stat)$\pm 0.5 $ (sys) MeV$/c^2$ and $J^\pi = 1^+$ was created., Comment: 5 pages, 5 figures

Published
2015
Full Text
View/download PDF

8. Candidate revolving chiral doublet bands in 119Cs

Author

Zheng, K. K., Petrache, C. M., Zhang, Z. H., Astier, A., Lv, B. F., Greenlees, P. T., Grahn, T., Julin, R., Juutinen, S., Luoma, M., Ojala, J., Pakarinen, J., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Tann, H., Uusitalo, J., Zimba, G., Cederwall, B., Aktas, Ö., Ertoprak, A., Zhang, W., Guo, S., Liu, M. L., Zhou, X. H., Kuti, I., Nyakó, B. M., Sohler, D., Timár, J., Andreoiu, C., Doncel, M., Joss, D. T., and Page, R. D.

Published
2022
Full Text
View/download PDF

9. $\gamma$-ray linear polarization measurements and $(g_{9/2})^{-3}$ neutron alignment in $^{91}$Ru

Author

Zheng, Y., de France, G., Clément, E., Dijon, A., Cederwall, B., Wadsworth, R., Bäck, T., Moradi, F. Ghazi, Jaworski, G., Nyakó, B. M., Nyberg, J., Palacz, M., Al-Azri, H., de Angelis, G., Atac, A., Aktaş, Ö., Bhattacharyya, S., Brock, T., Davies, P. J., Di Nitto, A., Dombradi, Zs., Gadea, A., Gal, J., Joshi, P., Juhasz, K., Julin, R., Jungclaus, A., Kalinka, G., Kownacki, J., La Rana, G., Lenzi, S. M., Molnar, J., Moro, R., Napoli, D. R., Singh, B. S. Nara, Persson, A., Recchia, F., Sandzelius, M., Scheurer, J. -N., Sletten, G., Sohler, D., Söderström, P. -A., Taylor, M. J., Timar, J., Valiente-Dobon, J. J., and Vardaci, E.

Subjects
Nuclear Experiment
Abstract

Linear polarization measurements have been performed for $\gamma$-rays in $^{91}$Ru produced with the $^{58}$Ni($^{36}$Ar, $2p1n$$\gamma$)$^{91}$Ru reaction at a beam energy of 111 MeV. The EXOGAM Ge clover array has been used to measure the $\gamma$-$\gamma$ coincidences, $\gamma$-ray linear polarization and $\gamma$-ray angular distributions. The polarization sensitivity of the EXOGAM clover detectors acting as Compton polarimeters has been determined in the energy range 0.3$-$1.3 MeV. Several transitions have been observed for the first time. Measurements of linear polarization and angular distribution have led to the firm assignments of spin differences and parity of high-spin states in $^{91}$Ru. More specifically, calculations using a semi-empirical shell model were performed to understand the structures of the first and second (21/2$^{+}$) and (17/2$^{+}$) levels. The results are in good agreement with the experimental data, supporting the interpretation of the non yrast (21/2$^{+}$) and (17/2$^{+}$) states in terms of the $J_{\rm max}$ and $J_{\rm max}-2$ members of the seniority-three $\nu(g_{9/2})^{-3}$ multiplet., Comment: 19 pages, 8 figures, 2 tables

Published
2013
Full Text
View/download PDF

10. The first candidate for chiral nuclei in the $A\sim80$ mass region: $^{80}$Br

Author

Wang, S. Y., Qi, B., Liu, L., Zhang, S. Q., Hua, H., Li, X. Q., Chen, Y. Y., Zhu, L. H., Meng, J., Wyngaardt, S. M., Papka, P., Ibrahim, T. T., Bark, R. A., Datta, P., Lawrie, E. A., Lawrie, J. J., Majola, S. N. T., Masiteng, P. L., Mullins, S. M., Gál, J., Kalinka, G., Molnár, J., Nyakó, B. M., Timár, J., Juhász, K., and Schwengner, R.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Excited states of $^{80}$Br have been investigated via the $^{76}$Ge($^{11}$B, $\alpha$3n) and $^{76}$Ge($^{7}$Li, 3n) reactions and a new $\Delta I$ = 1 band has been identified which resides $\sim$ 400 keV above the yrast band. Based on the experimental results and their comparison with the triaxial particle rotor model calculated ones, a chiral character of the two bands within the $\pi g_{9/2}\otimes \nu g_{9/2}$ configuration is proposed, which provides the first evidence for chirality in the $A\sim80$ region., Comment: 15 pages, 6 figures, accepted for publication in Physics Letters B

Published
2011
Full Text
View/download PDF

11. Evidence for a spin-aligned neutron-proton paired phase from the level structure of $^{92}$Pd

Author

Cederwall, B., Moradi, F. Ghazi, Bäck, T., Johnson, A., Blomqvist, J., Clément, E., de France, G., Wadsworth, R., Andgren, K., Lagergren, K., Dijon, A., Jaworski, G., Liotta, R., Qi, C., Nyakó, B. M., Nyberg, J., Palacz, M., Al-Azri, H., Algora, A., de Angelis, G., Ataç, A., Bhattacharyya, S., Brock, T., Brown, J. R., Davies, P., Di Nitto, A., Dombrádi, Zs., Gadea, A., Gál, J., Hadinia, B., Johnston-Theasby, F., Joshi, P., Juhász, K., Julin, R., Jungclaus, A., Kalinka, G., Kara, S. O., Khaplanov, A., Kownacki, J., La Rana, G., Lenzi, S. M., Molnár, J., Moro, R., Napoli, D. R., Singh, B. S. Nara, Persson, A., Recchia, F., Sandzelius, M., Scheurer, J. -N., Sletten, G., Sohler, D., Söderström, P. -A., Taylor, M. J., Timár, J., Valiente-Dobón, J. J., Vardaci, E., and Williams, S.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The general phenomenon of shell structure in atomic nuclei has been understood since the pioneering work of Goeppert-Mayer, Haxel, Jensen and Suess.They realized that the experimental evidence for nuclear magic numbers could be explained by introducing a strong spin-orbit interaction in the nuclear shell model potential. However, our detailed knowledge of nuclear forces and the mechanisms governing the structure of nuclei, in particular far from stability, is still incomplete. In nuclei with equal neutron and proton numbers ($N = Z$), the unique nature of the atomic nucleus as an object composed of two distinct types of fermions can be expressed as enhanced correlations arising between neutrons and protons occupying orbitals with the same quantum numbers. Such correlations have been predicted to favor a new type of nuclear superfluidity; isoscalar neutron-proton pairing, in addition to normal isovector pairing (see Fig. 1). Despite many experimental efforts these predictions have not been confirmed. Here, we report on the first observation of excited states in $N = Z = 46$ nucleus $^{92}$Pd. Gamma rays emitted following the $^{58}$Ni($^{36}$Ar,2$n$)$^{92}$Pd fusion-evaporation reaction were identified using a combination of state-of-the-art high-resolution {\gamma}-ray, charged-particle and neutron detector systems. Our results reveal evidence for a spin-aligned, isoscalar neutron-proton coupling scheme, different from the previous prediction. We suggest that this coupling scheme replaces normal superfluidity (characterized by seniority coupling) in the ground and low-lying excited states of the heaviest N = Z nuclei. The strong isoscalar neutron- proton correlations in these $N = Z$ nuclei are predicted to have a considerable impact on their level structures, and to influence the dynamics of the stellar rapid proton capture nucleosynthesis process., Comment: 13 pages, 3 figures

Published
2011
Full Text
View/download PDF

12. Lifetimes of core-excited states in semi-magic 95Rh

Author

Ertoprak, A., Qi, C., Cederwall, B., Doncel, M., Jakobsson, U., Nyakó, B. M., Jaworski, G., Davies, P., de France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Akkus, B., Al Azri, H., Algora, A., de Angelis, G., Atac, A., Bäck, T., Boso, A., Clément, E., Debenham, D. M., Dombrádi, Zs., Ertürk, S., Gadea, A., Ghazi Moradi, F., Gottardo, A., Hüyük, T., Ideguchi, E., Li, H., Michelagnoli, C., Modamio, V., Nyberg, J., Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Sohler, D., Timár, J., Valiente-Dobón, J. J., and Xiao, Z. G.

Published
2020
Full Text
View/download PDF

13. Evidence for spherical-oblate shape coexistence in Tc87

Author

Liu, X., primary, Cederwall, B., additional, Qi, C., additional, Wyss, R. A., additional, Aktas, Ö., additional, Ertoprak, A., additional, Zhang, W., additional, Clément, E., additional, de France, G., additional, Ralet, D., additional, Gadea, A., additional, Goasduff, A., additional, Jaworski, G., additional, Kuti, I., additional, Nyakó, B. M., additional, Nyberg, J., additional, Palacz, M., additional, Wadsworth, R., additional, Valiente-Dobón, J. J., additional, Al-Azri, H., additional, Ataç Nyberg, A., additional, Bäck, T., additional, de Angelis, G., additional, Doncel, M., additional, Dudouet, J., additional, Gottardo, A., additional, Jurado, M., additional, Ljungvall, J., additional, Mengoni, D., additional, Napoli, D. R., additional, Petrache, C. M., additional, Sohler, D., additional, Timár, J., additional, Barrientos, D., additional, Bednarczyk, P., additional, Benzoni, G., additional, Birkenbach, B., additional, Boston, A. J., additional, Boston, H. C., additional, Burrows, I., additional, Charles, L., additional, Ciemala, M., additional, Crespi, F. C. L., additional, Cullen, D. M., additional, Désesquelles, P., additional, Domingo-Pardo, C., additional, Eberth, J., additional, Erduran, N., additional, Ertürk, S., additional, González, V., additional, Goupil, J., additional, Hess, H., additional, Huyuk, T., additional, Jungclaus, A., additional, Korten, W., additional, Lemasson, A., additional, Leoni, S., additional, Maj, A., additional, Menegazzo, R., additional, Million, B., additional, Perez-Vidal, R. M., additional, Podolyàk, Zs., additional, Pullia, A., additional, Recchia, F., additional, Reiter, P., additional, Saillant, F., additional, Salsac, M. D., additional, Sanchis, E., additional, Simpson, J., additional, Stezowski, O., additional, Theisen, C., additional, and Zielińska, M., additional

Published
2022
Full Text
View/download PDF

14. M1 and E2 transition rates from core-excited states in semi-magic 94Ru

Author

Ertoprak, A., Cederwall, B., Qi, C., Doncel, M., Jakobsson, U., Nyakó, B. M., Jaworski, G., Davies, P., de France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Akkus, B., Al Azri, H., Algora, A., de Angelis, G., Atac, A., Bäck, T., Boso, A., Clément, E., Debenham, D. M., Dombrádi, Zs., Ertürk, S., Gadea, A., Ghazi Moradi, F., Gottardo, A., Hüyük, T., Ideguchi, E., Li, H., Michelagnoli, C., Modamio, V., Nyberg, J., Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Timár, J., Valiente-Dobón, J. J., and Xiao, Z. G.

Published
2018
Full Text
View/download PDF

15. Probing shell structure in neutron-rich nuclei with in-beam γ-spectroscopy

Author

Azaiez, F., Belleguic, M., Sohler, D., Stanoiu, M., Dombrádi, Zs., Sorlin, O., Timár, J., Amorini, F., Baiborodin, D., Bauchet, A., Becker, F., Borcea, C., Bourgeois, C., Dlouhy, Z., Donzaud, C., Duprat, J., Guillemaud-Mueller, D., Ibrahim, F., Lopez, M. J., Lucas, R., Lukyanov, S. M., Maslov, V., Mrazek, J., Moore, C., Nowacki, F., Nyakó, B. M., Penionzhkevich, Yu.-E., Saint-Laurent, M. G., Sarazin, F., Scarpaci, J. A., Sletten, G., Stodel, C., Taylor, M., Theisen, C., Voltolini, G., Äystö, Juha, editor, Dendooven, Peter, editor, Jokinen, Ari, editor, and Leino, Matti, editor

Published
2003
Full Text
View/download PDF

17. Systematics of Terminating Configurations in A ≈100 Pd Nuclei

Author

Nyakó, B. M., Gizon, J., Gizon, A., Timár, J., Zolnai, L., Perez, G. E., Dombrádi, Zs., Sohler, D., Boston, A. J., Joss, D. T., Paul, E. S., Semple, A. T., O’Brien, N. J., Parry, C. M., Afanasjev, A. V., Ragnarsson, I., Smit, F. D., editor, Lindsay, R., editor, and Förtsch, S. V., editor

Published
1999
Full Text
View/download PDF

18. Refined description of the positive-parity bands and the extent of octupole correlations in Ba120

Author

Lv, B. F., primary, Petrache, C. M., additional, Zheng, K. K., additional, Zhang, Z. H., additional, Sun, W., additional, Li, Z. P., additional, He, X. T., additional, Zhang, J., additional, Astier, A., additional, Greenlees, P., additional, Grahn, T., additional, Julin, R., additional, Juutinen, S., additional, Luoma, M., additional, Ojala, J., additional, Pakarinen, J., additional, Partanen, J., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Tann, H., additional, Uusitalo, J., additional, Zimba, G., additional, Cederwall, B., additional, Aktas, Ö., additional, Ertoprak, A., additional, Zhang, W., additional, Guo, S., additional, Liu, M. L., additional, Ong, H. J., additional, Sun, Z. Y., additional, Wang, J. G., additional, Zhou, X. H., additional, Kuti, I., additional, Nyakó, B. M., additional, Sohler, D., additional, Timár, J., additional, Andreoiu, C., additional, Doncel, M., additional, Joss, D. T., additional, and Page, R. D., additional

Published
2022
Full Text
View/download PDF

19. Candidate revolving chiral doublet bands in $${}^{119}$$Cs

Author

Zheng, K. K., primary, Petrache, C. M., additional, Zhang, Z. H., additional, Astier, A., additional, Lv, B. F., additional, Greenlees, P. T., additional, Grahn, T., additional, Julin, R., additional, Juutinen, S., additional, Luoma, M., additional, Ojala, J., additional, Pakarinen, J., additional, Partanen, J., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Tann, H., additional, Uusitalo, J., additional, Zimba, G., additional, Cederwall, B., additional, Aktas, Ö., additional, Ertoprak, A., additional, Zhang, W., additional, Guo, S., additional, Liu, M. L., additional, Zhou, X. H., additional, Kuti, I., additional, Nyakó, B. M., additional, Sohler, D., additional, Timár, J., additional, Andreoiu, C., additional, Doncel, M., additional, Joss, D. T., additional, and Page, R. D., additional

Published
2022
Full Text
View/download PDF

20. Evidence for spherical-oblate shape coexistence in $^{87}\mathrm{Tc}$

Author

Liu, X, Cederwall, B, Qi, C, Wyss, R A, Aktas, Ö, Ertoprak, A, Zhang, W, Clément, E, de France, G, Ralet, D, Gadea, A, Goasduff, A, Jaworski, G, Kuti, I, Nyakó, B M, Nyberg, J, Palacz, M, Wadsworth, R, Valiente-Dobón, J J, Al-Azri, H, Nyberg, A Ataç, Bäck, T, de Angelis, G, Doncel, M, Dudouet, J, Gottardo, A, Jurado, M, Ljungvall, J, Mengoni, D, Napoli, D R, Petrache, C M, Sohler, D, Timár, J, Barrientos, D, Bednarczyk, P, Benzoni, G, Birkenbach, B, Boston, A J, Boston, H C, Burrows, I, Charles, L, Ciemala, M, Crespi, F C L, Cullen, D M, Désesquelles, P, Domingo-Pardo, C, Eberth, J, Erduran, N, Ertürk, S, González, V, Goupil, J, Hess, H, Huyuk, T, Jungclaus, A, Korten, W, Lemasson, A, Leoni, S, Maj, A, Menegazzo, R, Million, B, Perez-Vidal, R M, Podolyàk, Zs, Pullia, A, Recchia, F, Reiter, P, Saillant, F, Salsac, M D, Sanchis, E, Simpson, J, Stezowski, O, Theisen, C, Zielinska, M, 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 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 des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

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

International audience; Excited states in the neutron-deficient nucleus $^{87}$Tc have been studied via the fusion-evaporation reaction $^{54}$Fe($^{36}$Ar, 2$n$1p) $^{87}$Tc at 115 MeV beam energy. The AGATA γ -ray spectrometer coupled to the DIAMANT, NEDA, and Neutron Wall detector arrays for light-particle detection was used to measure the prompt coincidence of $\gamma$ rays and light particles. Six transitions from the deexcitation of excited states belonging to a new band in $^{87}$Tc were identified by comparing $\gamma$-ray intensities in the spectra gated under different reaction channel selection conditions. The constructed level structure was compared with the shell model and total Routhian surface calculations. The results indicate that the new band structure in $^{87}$Tc is built on a spherical configuration, which is different from that assigned to the previously identified oblate yrast rotational band.

Published
2022

21. Refined description of the positive-parity bands and the extent of octupole correlations in 120Ba

Author

Lv, B. F., Petrache, C. M., Zheng, K. K., Zhang, Z. H., Sun, W., Li, Z. P., He, X. T., Zhang, J., Astier, A., Greenlees, P., Grahn, T., Julin, R., Juutinen, S., Luoma, M., Ojala, J., Pakarinen, J., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Tann, H., Uusitalo, J., Zimba, G., Cederwall, B., Aktas, Ö., Ertoprak, A., Zhang, W., Guo, S., Liu, M. L., Ong, H. J., Sun, Z. Y., Wang, J. G., Zhou, X. H., Kuti, I., Nyakó, B. M., Sohler, D., Timár, J., Andreoiu, C., Doncel, M., Joss, D. T., and Page, R. D.

Subjects
isotoopit, barium, ydinfysiikka
Abstract

Three new negative-parity bands have been identified in 120Ba, two of them forming a strongly coupled band. The previously known negative-parity band is significantly extended to high spin, while the lower part of the yrare positive-parity band has been modified. From the analysis of the band properties and comparison with the neighboring nuclei a coherent description of all bands is achieved. In particular, a simple explanation of the evolution of the positive-parity bands at high spin is proposed, including the possible occupation of the νf7/2[541]1/2− intruder orbital. Cranked Nilsson-Strutinsky calculations reveal similar quadrupole deformations but different triaxiality of the bands, while particle number conserving cranked shell model calculations qualitatively reproduce the experimental data and support the assigned configurations. The new measured ratios of reduced transition probabilities B(E1)/B(E2) complete the systematics in the 118–124Ba nuclei, exhibiting a decrease with decreasing neutron number, and are compared with the known values in the 116–120Xe nuclei, which are larger. Extended calculations with the quadrupole and octupole collective Hamiltonian based on the relativistic Hartree-Bogoliubov model employing the relativistic DD-PC1 density functional nicely reproduce the decreasing trend towards lower neutron numbers for Ba and Xe nuclei, as well as the larger values in Xe nuclei, but are much larger in amplitude than the experimental values. On the other hand, particle number conserving cranked shell model calculations without octupole deformation overestimate the low-spin values, while those with octupole deformation included reproduce the experimental values in 120Ba, suggesting the possible existence of moderate octupole collectivity in the negative-parity bands of nuclei in this mass region. peerReviewed

Published
2022

22. Evidence for enhanced neutron-proton correlations from the level structure of the N=Z+1 nucleus 87Tc

Author

Liu, X., Cederwall, B., Qi, C., Wyss, R. A., Aktas, Ertoprak, A., Zhang, W., Clément, E., De France, G., Ralet, D., Gadea, A., Goasduff, A., Jaworski, G., Kuti, I., Nyakó, B. M., Nyberg, J., Palacz, M., Wadsworth, R., Valiente-Dobón, J. J., Al-Azri, H., Ataç Nyberg, A., Bäck, T., De Angelis, G., Doncel, M., Dudouet, J., Gottardo, A., Jurado, M., Ljungvall, J., Mengoni, D., Napoli, D. R., Petrache, C. M., Sohler, D., Timár, J., Barrientos, D., Bednarczyk, P., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Burrows, I., Charles, L., Ciemala, M., Crespi, F. C.L., Cullen, D. M., Désesquelles, P., Domingo-Pardo, C., Eberth, J., Erduran, N., Ertürk, S., González, V., Goupil, J., Hess, H., Huyuk, T., Jungclaus, A., Korten, W., Lemasson, A., Leoni, S., Maj, A., Menegazzo, R., Million, B., Perez-Vidal, R. M., Podolyàk, Zs, Pullia, A., Recchia, F., Reiter, P., Saillant, F., Salsac, M. D., Sanchis, E., Simpson, J., Stezowski, O., Theisen, C., and Zielińska, M.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Nuclear Experiment
Abstract

The low-lying excited states in the neutron-deficient N=Z+1 nucleus Tc444387 have been studied via the fusion-evaporation reaction Fe54(Ar36, 2n1p)Tc87 at the Grand Accélérateur National d'Ions Lourds (GANIL), France. The AGATA spectrometer was used in conjunction with the auxiliary NEDA, Neutron Wall, and DIAMANT detector arrays to measure coincident prompt γ rays, neutrons, and charged particles emitted in the reaction. A level scheme of Tc87 from the (9/2g.s.+) state to the (33/21+) state was established based on six mutually coincident γ-ray transitions. The constructed level structure exhibits a rotational behavior with a sharp backbending at ω≈0.50 MeV. A decrease in alignment frequency and increase in alignment sharpness in the odd-mass isotonic chains around N=44 is proposed as an effect of the enhanced isoscalar neutron-proton interactions in odd-mass nuclei when approaching the N=Z line.

Published
2021

23. Observation of excited states in the neutron-rich nucleus Br89

Author

Nyakó, B. M., primary, Timár, J., additional, Csatlós, M., additional, Dombrádi, Zs., additional, Krasznahorkay, A. J., additional, Kuti, I., additional, Sohler, D., additional, Tornyi, T. G., additional, Czerwiński, M., additional, Rząca-Urban, T., additional, Urban, W., additional, Atanasova, L., additional, Balabanski, D. L., additional, Sieja, K., additional, Blanc, A., additional, de France, G., additional, Jentschel, M., additional, Köster, U., additional, Mutti, P., additional, Simpson, G. S., additional, Soldner, T., additional, and Ur, C. A., additional

Published
2021
Full Text
View/download PDF

24. Rich band structure and multiple long-lived isomers in the odd-odd Cs118 nucleus

Author

Zheng, K. K., primary, Petrache, C. M., additional, Zhang, Z. H., additional, Astier, A., additional, Lv, B. F., additional, Greenlees, P. T., additional, Grahn, T., additional, Julin, R., additional, Juutinen, S., additional, Luoma, M., additional, Ojala, J., additional, Pakarinen, J., additional, Partanen, J., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Tann, H., additional, Uusitalo, J., additional, Zimba, G., additional, Cederwall, B., additional, Aktas, Ö., additional, Ertoprak, A., additional, Zhang, W., additional, Guo, S., additional, Liu, M. L., additional, Zhou, X. H., additional, Kuti, I., additional, Nyakó, B. M., additional, Sohler, D., additional, Timár, J., additional, Andreoiu, C., additional, Doncel, M., additional, Joss, D. T., additional, and Page, R. D., additional

Published
2021
Full Text
View/download PDF

26. Complete set of proton excitations in Cs119

Author

Zheng, K. K., primary, Petrache, C. M., additional, Zhang, Z. H., additional, Astier, A., additional, Lv, B. F., additional, Greenlees, P. T., additional, Grahn, T., additional, Julin, R., additional, Juutinen, S., additional, Luoma, M., additional, Ojala, J., additional, Pakarinen, J., additional, Partanen, J., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Tann, H., additional, Uusitalo, J., additional, Zimba, G., additional, Cederwall, B., additional, Aktas, Ö., additional, Ertoprak, A., additional, Zhang, W., additional, Guo, S., additional, Liu, M. L., additional, Zhou, X. H., additional, Kuti, I., additional, Nyakó, B. M., additional, Sohler, D., additional, Timár, J., additional, Andreoiu, C., additional, Doncel, M., additional, Joss, D. T., additional, and Page, R. D., additional

Published
2021
Full Text
View/download PDF

27. Evidence for enhanced neutron-proton correlations from the level structure of the N=Z+1 nucleus Tc444387

Author

Liu, X., primary, Cederwall, B., additional, Qi, C., additional, Wyss, R. A., additional, Aktas, Ö., additional, Ertoprak, A., additional, Zhang, W., additional, Clément, E., additional, de France, G., additional, Ralet, D., additional, Gadea, A., additional, Goasduff, A., additional, Jaworski, G., additional, Kuti, I., additional, Nyakó, B. M., additional, Nyberg, J., additional, Palacz, M., additional, Wadsworth, R., additional, Valiente-Dobón, J. J., additional, Al-Azri, H., additional, Ataç Nyberg, A., additional, Bäck, T., additional, de Angelis, G., additional, Doncel, M., additional, Dudouet, J., additional, Gottardo, A., additional, Jurado, M., additional, Ljungvall, J., additional, Mengoni, D., additional, Napoli, D. R., additional, Petrache, C. M., additional, Sohler, D., additional, Timár, J., additional, Barrientos, D., additional, Bednarczyk, P., additional, Benzoni, G., additional, Birkenbach, B., additional, Boston, A. J., additional, Boston, H. C., additional, Burrows, I., additional, Charles, L., additional, Ciemala, M., additional, Crespi, F. C. L., additional, Cullen, D. M., additional, Désesquelles, P., additional, Domingo-Pardo, C., additional, Eberth, J., additional, Erduran, N., additional, Ertürk, S., additional, González, V., additional, Goupil, J., additional, Hess, H., additional, Huyuk, T., additional, Jungclaus, A., additional, Korten, W., additional, Lemasson, A., additional, Leoni, S., additional, Maj, A., additional, Menegazzo, R., additional, Million, B., additional, Perez-Vidal, R. M., additional, Podolyàk, Zs., additional, Pullia, A., additional, Recchia, F., additional, Reiter, P., additional, Saillant, F., additional, Salsac, M. D., additional, Sanchis, E., additional, Simpson, J., additional, Stezowski, O., additional, Theisen, C., additional, and Zielińska, M., additional

Published
2021
Full Text
View/download PDF

28. Neutron excitations in Ba119

Author

Zheng, K. K., primary, Petrache, C. M., additional, Zhang, Z. H., additional, Astier, A., additional, Lv, B. F., additional, Greenlees, P. T., additional, Grahn, T., additional, Julin, R., additional, Juutinen, S., additional, Luoma, M., additional, Ojala, J., additional, Pakarinen, J., additional, Partanen, J., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Tann, H., additional, Uusitalo, J., additional, Zimba, G., additional, Cederwall, B., additional, Aktas, Ö., additional, Ertoprak, A., additional, Zhang, W., additional, Guo, S., additional, Liu, M. L., additional, Zhou, X. H., additional, Kuti, I., additional, Nyakó, B. M., additional, Sohler, D., additional, Timár, J., additional, Andreoiu, C., additional, Doncel, M., additional, Joss, D. T., additional, and Page, R. D., additional

Published
2021
Full Text
View/download PDF

29. Neutron excitations in 119Ba

Author

Zheng, K. K., Petrache, C. M., Zhang, Z. H., Astier, A., Lv B., F., Greenlees, P. T., Grahn, T., Julin, R., Juutinen, S., Luoma, M., Ojala, J., Pakarinen, J., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Tann, H., Uusitalo, J., Zimba, G., Cederwall, B., Aktas, Ö., Ertoprak, A., Zhang, W., Guo, S., Liu, M. L., Zhou, X. H., Kuti, I., Nyakó, B. M., Sohler, D., Timár, J., Andreoiu, C., Doncel, M., Joss, D. T., and Page, R. D.

Subjects
ydinfysiikka
Abstract

The neutron-deficient 119Ba nucleus has been studied using the 58Ni(64Zn,2pn) reaction and the JUROGAM 3 γ-ray detector array coupled to the MARA recoil-mass separator setup. One new rotational band and several low-lying states are newly identified. A half-life of T1/2=0.36(2)μs has been measured for the 5/2− bandhead of the νh11/2 band. The two previously known rotational bands are confirmed, except for the higher part of the +1/2 signature partner of the positive-parity band. Configurations are assigned based on the analysis of the observed quasiparticle alignments whose nature is unveiled by the calculations using the particle number conserving cranked shell model. peerReviewed

Published
2021

30. Rich band structure and multiple long-lived isomers in the odd-odd 118Cs nucleus

Author

Zheng, K. K., Petrache, C. M., Zhang, Z. H., Astier, A., Lv, B. F., Greenlees, P. T., Grahn, T., Julin, R., Juutinen, S., Luoma, M., Ojala, J., Pakarinen, J., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Tann, H., Uusitalo, J., Zimba, G., Cederwall, B., Aktas, Ö., Ertoprak, A., Zhang, W., Guo, S., Liu, M. L., Zhou, X. H., Kuti, I., Nyakó, B. M., Sohler, D., Timár, J., Andreoiu, C., Doncel, M., Joss, D. T., and Page, R. D.

Subjects
cesium, ydinfysiikka
Abstract

One of the largest sets of collective excitations built on two-quasiparticle configurations in odd-odd nuclei of the proton-rich A≈120 mass region is reported in 118Cs. Several new rotational bands and long-lived isomers have been identified. The 8+ bandhead of the πh11/2⊗νh11/2 band is a short-lived isomer with a half-life in the nanosecond range, while the 7+ state below it is a long-lived isomer with a half-life of T1/2=0.55(6)μs. Two other long-lived isomers have been identified: a 66-keV transition detected at the MARA focal plane depopulates one of them, indicating a half-life in the microsecond range, while no depopulating transitions have been identified for the other, indicating a much longer half-life. Extensive particle number conserving cranked shell model calculations and alignment analysis have been employed to investigate the rich band structure of 118Cs, which exhibits one of the most complete sets of two-quasiparticle configurations in nuclei close to the proton drip line. peerReviewed

Published
2021

31. Evidence for enhanced neutron-proton correlations from the level structure of the N=Z+1 nucleus Tc44 4387

Author

Liu, X., Cederwall, B., Qi, C., Wyss, R. A., Aktas, Ó, Ertoprak, A., Zhang, W., Clément, E., De France, G., Ralet, D., Gadea, Andrés, Goasduff, A., Jaworski, G., Kuti, I., Nyakó, B. M., Nyberg, J., Palacz, M., Wadsworth, R., Valiente-Dobón, J. J., Al-Azri, H., Ataç Nyberg, A., Bäck, T., De Angelis, G., Doncel, M., Dudouet, J., Gottardo, A., Jurado, M., Ljungvall, J., Mengoni, D., Napoli, D.R., Petrache, C. M., Sohler, D., Timár, J., Barrientos, D., Bednarczyk, P., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Burrows, I., Charles, L., Ciemala, M., Crespi, F.C.L., Cullen, D.M., Désesquelles, P., Domingo Pardo, César, Eberth, J., Erduran, N., Ertürk, S., González, V., Goupil, J., Hess, H., Hüyük, T., Jungclaus, Andrea, Korten, W., Lemasson, A., Leoni, S., Maj, A., Menegazzo, R., Million, B., Perez-Vidal, R. M., Podolyàk, Zs, Pullia, A., Recchia, F., Reiter, P., Saillant, F., Salsac, M. D., Sanchis, E., Simpson, J., Stezowski, O., Theisen, C., Zielińska, M., Swedish Research Council, European Commission, Science and Technology Facilities Council (UK), National Science Centre (Poland), National Research, Development and Innovation Office (Hungary), Agencia Estatal de Investigación (España), Generalitat Valenciana, and China Scholarship Council

Abstract

5 pags., 4 figs., The low-lying excited states in the neutron-deficient N=Z+1 nucleus Tc444387 have been studied via the fusion-evaporation reaction Fe54(Ar36, 2n1p)Tc87 at the Grand Accélérateur National d'Ions Lourds (GANIL), France. The AGATA spectrometer was used in conjunction with the auxiliary NEDA, Neutron Wall, and DIAMANT detector arrays to measure coincident prompt γ rays, neutrons, and charged particles emitted in the reaction. A level scheme of Tc87 from the (9/2g.s.+) state to the (33/21+) state was established based on six mutually coincident γ-ray transitions. The constructed level structure exhibits a rotational behavior with a sharp backbending at ω≈0.50 MeV. A decrease in alignment frequency and increase in alignment sharpness in the odd-mass isotonic chains around N=44 is proposed as an effect of the enhanced isoscalar neutron-proton interactions in odd-mass nuclei when approaching the N=Z line., This work was supported by the Swedish Research Council under Grants No. 621-2014-5558 and No. 2019-04880, the EU 7th Framework Programme, Integrating Activities Transnational Access, Project No. 262010 ENSAR, the UK STFC under Grants No. ST/L005727/1 and No. ST/P003885/1, the Polish National Science Centre, Grants No. 2017/25/B/ST2/01569, No. COPIN-INFN, No. COPIN-IN2P3, and No. COPIGAL projects, the National Research, Development and Innovation Fund of Hungary (Project No. K128947), the European Regional Development Fund (Contract No. GINOP-2.3.3-15-2016-00034), the Hungarian National Research, Development and Innovation Office - NKFIH, Contract No. PD124717, the Ministerio de Ciencia e Innovación and Generalitat Valenciana, Spanish, under Grants No. SEV-2014-0398, No. FPA2017-84756-C4, and No. PROMETEO/2019/005 and by the EU FEDER funds. X.L. gratefully acknowledges support from the China Scholarship Council, Grant No. 201700260183 for his stay in Sweden.

Published
2021

32. Complete set of proton excitations in 119Cs

Author

Zheng, K. K., Petrache, C. M., Zhang, Z. H., Astier, A., Lv, B. F., Greenlees, P. T., Grahn, T., Julin, R., Juutinen, S., Luoma, M., Ojala, J., Pakarinen, J., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Tann, H., Uusitalo, J., Zimba, G., Cederwall, B., Aktas, Ö., Ertoprak, A., Zhang, W., Guo, S., Liu, M. L., Zhou, X. H., Kuti, I., Nyakó, B. M., Sohler, D., Timár, J., Andreoiu, C., Doncel, M., Joss, D. T., and Page, R. D.

Subjects
cesium, ydinfysiikka
Abstract

The very neutron-deficient strongly deformed 119Cs nucleus has been studied using the 58Ni(64Zn,3p) reaction and the JUROGAM 3 γ-ray detector array coupled to the MARA recoil-mass separator setup. The excitation energies of all observed bands have been determined, spins and parities have been firmly assigned to most of the observed states. The previously known and the newly identified rotational bands have been extended to very high spin and excitation energy. The configurations of the observed bands are discussed using the particle number conserving cranked shell model. The present study establishes the largest set of rotational bands observed in the proton-rich A≈120 mass region. peerReviewed

Published
2021

33. Medium-spin states of the neutron-rich nucleus Br87

Author

Nyakó, B. M., primary, Timár, J., additional, Csatlós, M., additional, Dombrádi, Zs., additional, Krasznahorkay, A., additional, Kuti, I., additional, Sohler, D., additional, Tornyi, T. G., additional, Czerwiński, M., additional, Rząca-Urban, T., additional, Urban, W., additional, Bączyk, P., additional, Atanasova, L., additional, Balabanski, D. L., additional, Sieja, K., additional, Blanc, A., additional, Jentschel, M., additional, Köster, U., additional, Mutti, P., additional, Soldner, T., additional, de France, G., additional, Simpson, G. S., additional, and Ur, C. A., additional

Published
2021
Full Text
View/download PDF

34. Lifetimes of core-excited states in semi-magic $^{95}$Rh

Author

Ertoprak, A., Qi, C., Cederwall, B., Doncel, M., Jakobsson, U., Nyakó, B. M., Jaworski, G., Davies, P., de France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Akkus, B., Al Azri, H., Algora, A., de Angelis, G., Atac, A., Bäck, T., Boso, A., Clément, E., Debenham, D. M., Dombrádi, Zs, Ertürk, S., Gadea, A., Ghazi Moradi, F., Gottardo, A., Hüyük, T., Ideguchi, E., Li, H., Michelagnoli, C., Modamio, V., Nyberg, J., Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Sohler, D., Timár, J., Valiente-Dobón, J. J., Xiao, Z. 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), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
lifetimes, core-excited states, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ydinfysiikka, ComputingMilieux_MISCELLANEOUS
Abstract

Lifetimes of negative-parity states have been determined in the neutron deficient semi-magic (N = 50) nucleus 95Rh. The fusion-evaporation reaction 58Ni(40Ca,3p) was used to populate high-spin states in 95Rh at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator facility. The results were obtained using the Doppler Shift Attenuation Method (DSAM) based on the Doppler broadened line shapes produced during the slowing down process of the residual nuclei in a thick 6mg/cm2 metallic target. B(M1) and B(E2) reduced transition strengths are compared with predictions from large-scale shell-model calculations. peerReviewed

Published
2020

35. Isospin Properties of Nuclear Pair Correlations from the Level Structure of the Self-Conjugate Nucleus Ru 88

Author

Cederwall, B., Liu, X., Aktas, O., Ertoprak, A., Qi, C., Clément, E., De France, G., Ralet, D., Gadea, A., Goasduff, A., Jaworski, G., Kuti, I., Nyakó, B. M., Nyberg, J., Palacz, M., Wadsworth, R., Valiente-Dobón, J. J., Al-Azri, H., Ataç Nyberg, A., Bäck, T., De Angelis, G., Doncel, M., Dudouet, J., Gottardo, A., Jurado, M., Ljungvall, J., Mengoni, D., Napoli, D. R., Petrache, C. M., Sohler, D., Timár, J., Barrientos, D., Bednarczyk, P., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Burrows, I., Charles, L., Ciemala, M., Crespi, F. C.L., Cullen, D. M., Désesquelles, P., Domingo-Pardo, C., Eberth, J., Erduran, N., Ertürk, S., González, V., Goupil, J., Hess, H., Huyuk, T., Jungclaus, A., Korten, W., Lemasson, A., Leoni, S., Maj, A., Menegazzo, R., Million, B., Perez-Vidal, R. M., Podolyak, Zs, Pullia, A., Recchia, F., Reiter, P., Saillant, F., Salsac, M. D., Sanchis, E., Simpson, J., Stezowski, O., Theisen, Ch, and Zielińska, M.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The low-lying energy spectrum of the extremely neutron-deficient self-conjugate (N=Z) nuclide Ru448844 has been measured using the combination of the Advanced Gamma Tracking Array (AGATA) spectrometer, the NEDA and Neutron Wall neutron detector arrays, and the DIAMANT charged particle detector array. Excited states in Ru88 were populated via the Fe54(Ar36,2nγ)Ru88∗ fusion-evaporation reaction at the Grand Accélérateur National d'Ions Lourds (GANIL) accelerator complex. The observed γ-ray cascade is assigned to Ru88 using clean prompt γ-γ-2-neutron coincidences in anticoincidence with the detection of charged particles, confirming and extending the previously assigned sequence of low-lying excited states. It is consistent with a moderately deformed rotating system exhibiting a band crossing at a rotational frequency that is significantly higher than standard theoretical predictions with isovector pairing, as well as observations in neighboring N>Z nuclides. The direct observation of such a "delayed" rotational alignment in a deformed N=Z nucleus is in agreement with theoretical predictions related to the presence of strong isoscalar neutron-proton pair correlations.

Published
2020

36. First candidates for γ vibrational bands built on the [505]11/2⁻ neutron orbital in odd-A Dy isotopes

Author

Majola, S. N. T., Sithole, M. A., Mdletshe, L., Hartley, D., Timár, J., Nyakó, B. M., Allmond, J. M., Bark, R. A., Beausang, C., Bianco, L., Bucher, T. D., Bvumbi, S. P., Carpenter, M. P., Chiara, C. J., Cooper, N., Cullen, D. M., Curien, D., Dinoko, T. S., Gall, B. J. P., Garrett, P. E., Greenlees, P. T., Hirvonen, J., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kheswa, B. V., Kondev, F. G., Korichi, A., Kulp, W. D., Lauritsen, T., Lawrie, E. A., Makhathini, L., Masiteng, P. L., Maqabuka, B., McCutchan, E. A., Miller, D., Miller, S., Minkova, A., Msebi, L., Mthembu, S. H., Ndayishimye, J., Nieminen, P., Ngcobo, P. Z., Ntshangase, S. S., Orce, J. N., Peura, P., Rahkila, P., Redon, N., Riedinger, L. L., Riley, M. A., Roux, D. G., Ruotsalainen, P., Piot, J., Saren, J., Sharpey-Schafer, J. F., Scholey, C., Shirinda, O., Simpson, J., Sorri, J., Stefanescu, I., Stolze, S., Uusitalo, J., Wang, X., Werner, V., Wood, J. L., Yu, C.-H., Zhu, S., and Zimba, G.

Subjects
nuclear spin and parity, shell model, collective levels, hiukkasfysiikka, ydinfysiikka, nuclear structure and decays, nuclear fusion, nuclear reactions
Abstract

Rotational structures have been measured using the Jurogam II and GAMMASPHERE arrays at low spin following the 155Gd(α,2n)157Dy and 148Nd(12C,5n)155Dy reactions at 25 and 65 MeV, respectively. We report high-K bands, which are conjectured to be the first candidates of a Kπ=2+γ vibrational band, built on the [505]11/2− neutron orbital, in both odd-A155,157Dy isotopes. The coupling of the first excited K=0+ states or the so-called β vibrational bands at 661 and 676 keV in 154Dy and 156Dy to the [505]11/2− orbital, to produce a Kπ=11/2− band, was not observed in both 155Dy and 157Dy, respectively. The implication of these findings on the interpretation of the first excited 0+ states in the core nuclei 154Dy and 156Dy are also discussed. peerReviewed

Published
2020

37. Highly deformed band structures due to core excitations in Xe123

Author

Basu, Anwesha, primary, Singh, A. K., additional, Ragnarsson, I., additional, Carlsson, B. G., additional, Kardan, A., additional, Hagemann, G. B., additional, Sletten, G., additional, Herskind, B., additional, Hübel, H., additional, Chmel, S., additional, Wilson, A. N., additional, Rogers, J., additional, Janssens, R. V. F., additional, Carpenter, M. P., additional, Khoo, T. L., additional, Kondev, F. G., additional, Lauritsen, T., additional, Zhu, S., additional, Korichi, A., additional, Fallon, P., additional, Nyakó, B. M., additional, and Timár, J., additional

Published
2021
Full Text
View/download PDF

38. Co-existing coupling schemes at high spin in 166Hf

Author

Jensen, D. Ringkjøbing, Domscheit, J., Hagemann, G. B., Bergström, M., Herskind, B., Nielsen, B. S., Sletten, G., Varmette, P. G., Törmänen, S., Hübel, H., Ma, W., Bracco, A., Camera, F., Demaria, F., Frattini, S., Million, B., Napoli, D., Maj, A., Nyakó, B. M., Joss, D. T., and Aiche, M.

Published
2000
Full Text
View/download PDF

39. Evidence for a spin-aligned neutron–proton paired phase from the level structure of 92Pd

Author

Cederwall, B., Moradi, Ghazi F., Bäck, T., Johnson, A., Blomqvist, J., Clément, E., de France, G., Wadsworth, R., Andgren, K., Lagergren, K., Dijon, A., Jaworski, G., Liotta, R., Qi, C., Nyakó, B. M., Nyberg, J., Palacz, M., Al-Azri, H., Algora, A., de Angelis, G., Ataç, A., Bhattacharyya, S., Brock, T., Brown, J. R., Davies, P., Di Nitto, A., Dombrádi, Zs., Gadea, A., Gál, J., Hadinia, B., Johnston-Theasby, F., Joshi, P., Juhász, K., Julin, R., Jungclaus, A., Kalinka, G., Kara, S. O., Khaplanov, A., Kownacki, J., La Rana, G., Lenzi, S. M., Molnár, J., Moro, R., Napoli, D. R., Singh, Nara B. S., Persson, A., Recchia, F., Sandzelius, M., Scheurer, J.-N., Sletten, G., Sohler, D., Söderström, P.-A., Taylor, M. J., Timár, J., Valiente-Dobón, J. J., Vardaci, E., and Williams, S.

Published
2011
Full Text
View/download PDF

40. Triaxiality-related nuclear phenomena in the A ≈ 100 mass region

Author

Timár, J., primary, Kruzsicz, B., additional, Kuti, I., additional, Sohler, D., additional, Molnár, J., additional, Nyakó, B. M., additional, Chen, Q.B., additional, Zhang, S.Q., additional, Meng, J., additional, Joshi, P., additional, Wadsworth, R., additional, Starosta, K., additional, and Koike, T., additional

Published
2020
Full Text
View/download PDF

41. First candidates for γ vibrational bands built on the [505]11/2− neutron orbital in odd- A Dy isotopes

Author

Majola, S. N. T., primary, Sithole, M. A., additional, Mdletshe, L., additional, Hartley, D., additional, Timár, J., additional, Nyakó, B. M., additional, Allmond, J. M., additional, Bark, R. A., additional, Beausang, C., additional, Bianco, L., additional, Bucher, T. D., additional, Bvumbi, S. P., additional, Carpenter, M. P., additional, Chiara, C. J., additional, Cooper, N., additional, Cullen, D. M., additional, Curien, D., additional, Dinoko, T. S., additional, Gall, B. J. P., additional, Garrett, P. E., additional, Greenlees, P. T., additional, Hirvonen, J., additional, Jakobsson, U., additional, Jones, P. M., additional, Julin, R., additional, Juutinen, S., additional, Ketelhut, S., additional, Kheswa, B. V., additional, Kondev, F. G., additional, Korichi, A., additional, Kulp, W. D., additional, Lauritsen, T., additional, Lawrie, E. A., additional, Makhathini, L., additional, Masiteng, P. L., additional, Maqabuka, B., additional, McCutchan, E. A., additional, Miller, D., additional, Miller, S., additional, Minkova, A., additional, Msebi, L., additional, Mthembu, S. H., additional, Ndayishimye, J., additional, Nieminen, P., additional, Ngcobo, P. Z., additional, Ntshangase, S. S., additional, Orce, J. N., additional, Peura, P., additional, Rahkila, P., additional, Redon, N., additional, Riedinger, L. L., additional, Riley, M. A., additional, Roux, D. G., additional, Ruotsalainen, P., additional, Piot, J., additional, Saren, J., additional, Sharpey-Schafer, J. F., additional, Scholey, C., additional, Shirinda, O., additional, Simpson, J., additional, Sorri, J., additional, Stefanescu, I., additional, Stolze, S., additional, Uusitalo, J., additional, Wang, X., additional, Werner, V., additional, Wood, J. L., additional, Yu, C.-H., additional, Zhu, S., additional, and Zimba, G., additional

Published
2020
Full Text
View/download PDF

42. Evolution of collective and noncollective structures in Xe123

Author

Basu, Anwesha, primary, Singh, A. K., additional, Nag, S., additional, Hagemann, G. B., additional, Sletten, G., additional, Herskind, B., additional, Wilson, A. N., additional, Rogers, J., additional, Ragnarsson, I., additional, Hübel, H., additional, Chmel, S., additional, Janssens, R. V. F., additional, Carpenter, M. P., additional, Khoo, T. L., additional, Kondev, F. G., additional, Lauritsen, T., additional, Zhu, S., additional, Korichi, A., additional, Fallon, P., additional, Nyakó, B. M., additional, and Timár, J., additional

Published
2020
Full Text
View/download PDF

43. Isospin Properties of Nuclear Pair Correlations from the Level Structure of the Self-Conjugate Nucleus Ru88

Author

Cederwall, B., primary, Liu, X., additional, Aktas, Ö., additional, Ertoprak, A., additional, Zhang, W., additional, Qi, C., additional, Clément, E., additional, de France, G., additional, Ralet, D., additional, Gadea, A., additional, Goasduff, A., additional, Jaworski, G., additional, Kuti, I., additional, Nyakó, B. M., additional, Nyberg, J., additional, Palacz, M., additional, Wadsworth, R., additional, Valiente-Dobón, J. J., additional, Al-Azri, H., additional, Ataç Nyberg, A., additional, Bäck, T., additional, de Angelis, G., additional, Doncel, M., additional, Dudouet, J., additional, Gottardo, A., additional, Jurado, M., additional, Ljungvall, J., additional, Mengoni, D., additional, Napoli, D. R., additional, Petrache, C. M., additional, Sohler, D., additional, Timár, J., additional, Barrientos, D., additional, Bednarczyk, P., additional, Benzoni, G., additional, Birkenbach, B., additional, Boston, A. J., additional, Boston, H. C., additional, Burrows, I., additional, Charles, L., additional, Ciemala, M., additional, Crespi, F. C. L., additional, Cullen, D. M., additional, Désesquelles, P., additional, Domingo-Pardo, C., additional, Eberth, J., additional, Erduran, N., additional, Ertürk, S., additional, González, V., additional, Goupil, J., additional, Hess, H., additional, Huyuk, T., additional, Jungclaus, A., additional, Korten, W., additional, Lemasson, A., additional, Leoni, S., additional, Maj, A., additional, Menegazzo, R., additional, Million, B., additional, Perez-Vidal, R. M., additional, Podolyak, Zs., additional, Pullia, A., additional, Recchia, F., additional, Reiter, P., additional, Saillant, F., additional, Salsac, M. D., additional, Sanchis, E., additional, Simpson, J., additional, Stezowski, O., additional, Theisen, Ch., additional, and Zielińska, M., additional

Published
2020
Full Text
View/download PDF

47. β and γ bands in N = 88, 90, and 92 isotones investigated with a five-dimensional collective Hamiltonian based on covariant density functional theory : Vibrations, shape coexistence, and superdeformation

Author

Majola, S. N. T., Shi, Z., Song, B. Y., Li, Z. P., Zhang, S. Q., Bark, R. A., Sharpey-Schafer, J. F., Aschman, D. G., Bvumbi, S. P., Bucher, T. D., Cullen, D. M., Dinoko, T. S., Easton, J. E., Erasmus, N., Greenlees, P. T., Hartley, D. J., Hirvonen, J., Korichi, A., Jakobsson, U., Jones, P., Jongile, S., Julin, R., Juutinen, S., Ketelhut, S., Kheswa, B. V., Khumalo, N. A., Lawrie, E. A., Lawrie, J. J., Lindsay, R., Madiba, T. E., Makhathini, L., Maliage, S. M., Maqabuka, B., Malatji, K. L., Masiteng, P. L., Mashita, P. I., Mdletshe, L., Minkova, A., Msebi, L., Mullins, S. M., Ndayishimye, J., Negi, D., Netshiya, A., Newman, R., Ntshangase, S. S., Ntshodu, R., Nyakó, B. M., Papka, P., Peura, P., Rahkila, P., Riedinger, L. L., Riley, M. A., Roux, D. G., Ruotsalainen, P., Saren, J. J., Scholey, C., Shirinda, O., Sithole, M. A., Sorri, J., Stankiewicz, M., Stolze, S., Timár, J., Uusitalo, J., Vymers, P. A., Wiedeking, M., and Zimba, G. L.

Subjects
electromagnetic transitions, nuclear density functional theory, nuclear spin and parity, nucleon induced nuclear reactions, collective levels, collective models, low and intermediate energy heavy-ion reactions, ydinfysiikka
Abstract

A comprehensive systematic study is made for the collective β and γ bands in even-even isotopes with neutron numbers N=88 to 92 and proton numbers Z=62(Sm) to 70 (Yb). Data, including excitation energies, B(E0) and B(E2) values, and branching ratios from previously published experiments are collated with new data presented for the first time in this study. The experimental data are compared to calculations using a five-dimensional collective Hamiltonian (5DCH) based on the covariant density functional theory (CDFT). A realistic potential in the quadrupole shape parameters V(β,γ) is determined from potential energy surfaces (PES) calculated using the CDFT. The parameters of the 5DCH are fixed and contained within the CDFT. Overall, a satisfactory agreement is found between the data and the calculations. In line with the energy staggering S(I) of the levels in the 2γ+ bands, the potential energy surfaces of the CDFT calculations indicate γ-soft shapes in the N=88 nuclides, which become γ rigid for N=90 and N=92. The nature of the 02+ bands changes with atomic number. In the isotopes of Sm to Dy, they can be understood as β vibrations, but in the Er and Yb isotopes the 02+ bands have wave functions with large components in a triaxial superdeformed minimum. In the vicinity of 152Sm, the present calculations predict a soft potential in the β direction but do not find two coexisting minima. This is reminiscent of 152Sm exhibiting an X(5) behavior. The model also predicts that the 03+ bands are of two-phonon nature, having an energy twice that of the 02+ band. This is in contradiction with the data and implies that other excitation modes must be invoked to explain their origin. peerReviewed

Published
2019

48. Experimental Evidence for Transverse Wobbling in $^{105}$Pd

Author

Timár, J, Chen, Q B, Kruzsicz, B, Sohler, D, Kuti, I, Zhang, S Q, Meng, J, Joshi, P, Wadsworth, R, Starosta, K, Algora, A, Bednarczyk, P, Curien, D, Dombrádi, Zs, Duchêne, G, Gizon, A, Gizon, J, Jenkins, D G, Koike, T, Krasznahorkay, A, Molnár, J, Nyakó, B M, Paul, E S, Rainovski, G, Scheurer, J N, Simons, A J, Vaman, C, Zolnai, L, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 ), and Université Grenoble Alpes (UGA)

Subjects
Nuclear Theory (nucl-th), Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Physics::Geophysics, Nuclear Physics
Abstract

New rotational bands built on the $\nu$$(h_{11/2})$ configuration have been identified in $^{105}$Pd. Two bands built on this configuration show the characteristics of transverse wobbling: the $\Delta$$I$=1 transitions between them have a predominant E2 component and the wobbling energy decreases with increasing spin. The properties of the observed wobbling bands are in good agreement with theoretical results obtained using constrained triaxial covariant density functional theory and quantum particle rotor model calculations. This provides the first experimental evidence for transverse wobbling bands based on a one-neutron configuration, and also represents the first observation of wobbling motion in the $A$$\sim$100 mass region.

Published
2019

49. Systematics of Terminating Configurations in A ≈100 Pd Nuclei

Author

Nyakó, B. M., primary, Gizon, J., additional, Gizon, A., additional, Timár, J., additional, Zolnai, L., additional, Perez, G. E., additional, Dombrádi, Zs., additional, Sohler, D., additional, Boston, A. J., additional, Joss, D. T., additional, Paul, E. S., additional, Semple, A. T., additional, O’Brien, N. J., additional, Parry, C. M., additional, Afanasjev, A. V., additional, and Ragnarsson, I., additional

Published
2000
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results