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3 results on '"Nyberg, A Atac"'

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. Evidence for enhanced neutron-proton correlations from the levelstructure of the N= Z+ 1 nucleus 8743Tc44

Author

Liu, X., Cederwall, B., Qi, C., Wyss, R. A., Aktas, O., Ertoprak, A., Zhang, W., Clement, E., de France, G., Ralet, D., Gadea, A., Goasduff, A., Jaworski, G., Kuti, I, Nyako, B. M., Nyberg, Johan, Palacz, M., Wadsworth, R., Valiente-Dobon, J. J., Al-Azri, H., Nyberg, A. Atac, Back, T., de Angelis, G., Doncel, M., Dudouet, J., Gottardo, A., Jurado, M., Ljungvall, J., Mengoni, D., Napoli, D. R., Petrache, C. M., Sohler, D., Timar, 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., Desesquelles, P., Domingo-Pardo, C., Eberth, J., Erduran, N., Erturk, S., Gonzalez, 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, C., and Zielinska, M.

Subjects
Subatomär fysik, Astrophysics::High Energy Astrophysical Phenomena, Atom and Molecular Physics and Optics, Nuclear Theory, Subatomic Physics, Atom- och molekylfysik och optik, Nuclear Experiment
Abstract

The low-lying excited states in the neutron-deficient N = Z + 1 nucleus (87)(43)Tcc(44) have been studied via the fusion-evaporation reaction Fe-54(Ar-36, 2n1p)Tc-87 at the Grand Accelerateur 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 Tc-87 from the (9/2(g.s.)(+)) state to the (33/2(1)(+)) state was established based on six mutually coincident gamma-ray transitions. The constructed level structure exhibits a rotational behavior with a sharp backbending at (h) over bar omega approximate to 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. Title in WoS: Evidence for enhanced neutron-proton correlations from the level structure of the N = Z+1 nucleus Tc-87(43)44

Published
2021

3. 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., Zhang, W., Qi, C., Clement, E., de France, G., Ralet, D., Gadea, A., Goasduff, A., Jaworski, G., Kuti, I., Nyako, B. M., Nyberg, Johan, Palacz, M., Wadsworth, R., Valiente-Dobon, J. J., Al-Azri, H., Nyberg, A. Atac, Back, T., de Angelis, G., Doncel, M., Dudouet, J., Gottardo, A., Jurado, M., Ljungvall, J., Mengoni, D., Napoli, D. R., Petrache, C. M., Sohler, D., Timar, 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., Desesquelles, P., Domingo-Pardo, C., Eberth, J., Erduran, N., Erturk, S., Gonzalez, 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 Zielinska, M.

Subjects
Subatomär fysik, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Subatomic Physics, Nuclear Experiment
Abstract

The low-lying energy spectrum of the extremely neutron-deficient self-conjugate (N = Z) nuclide Ru-88(44)44 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 Ru-88 were populated via the Fe-54(Ar-36, 2n gamma)Ru-88* fusion-evaporation reaction at the Grand Accelerateur National d'Ions Lourds (GANIL) accelerator complex. The observed gamma-ray cascade is assigned to Ru-88 using clean prompt gamma-gamma-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

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