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812 results on '"Scholey, C"'

51. First observation of high-K isomeric states in $$^{249}$$Md and $$^{251}$$Md

Author

Goigoux, T., primary, Theisen, Ch., additional, Sulignano, B., additional, Airiau, M., additional, Auranen, K., additional, Badran, H., additional, Briselet, R., additional, Calverley, T., additional, Cox, D., additional, Déchery, F., additional, Bisso, F. Defranchi, additional, Drouart, A., additional, Favier, Z., additional, Gall, B., additional, Grahn, T., additional, Greenlees, P. T., additional, Hauschild, K., additional, Herzáň, A., additional, Herzberg, R.-D., additional, Jakobsson, U., additional, Julin, R., additional, Juutinen, S., additional, Konki, J., additional, Leino, M., additional, Lightfoot, A., additional, Lopez-Martens, A., additional, Mistry, A., additional, Nieminen, P., additional, Pakarinen, J., additional, Papadakis, P., additional, Partanen, J., additional, Peura, P., additional, Rahkila, P., additional, Rey-Herme, E., additional, Rubert, J., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scholey, C., additional, Sorri, J., additional, Stolze, S., additional, Uusitalo, J., additional, Vandebrouck, M., additional, Ward, A., additional, Zielińska, M., additional, Jachimowicz, P., additional, Kowal, M., additional, and Skalski, J., additional

Published
2021
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52. Lifetime measurements of excited states in 169,171,173Os: Persistence of anomalous B(E2) ratios in transitional rare earth nuclei in the presence of a decoupled i13/2 valence neutron

Author

Zhang, W., Cederwall, B., Doncel, M., Aktas, Ö., Ertoprak, A., Liotta, R., Qi, C., Grahn, T., Nara Singh, B.S., Cullen, D.M., Hodge, D., Giles, M., Stolze, S., Badran, H., Braunroth, T., Calverley, T., Cox, D.M., Fang, Y.D., Greenlees, P.T., Hilton, J., Ideguchi, E., Julin, R., Juutinen, S., Kumar Raju, M., Li, H., Liu, H., Matta, S., Subramaniam, P., Modamio, V., Pakarinen, J., Papadakis, P., Partanen, J., Petrache, C.M., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., Sorri, J., Taylor, M.J., Uusitalo, J., and Valiente-Dobón, J.J.

Published
2021
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53. Single-particle and collective excitations in the transitional nucleus 166Os

Author

Stolze, S, primary, Grahn, T, additional, Julin, R, additional, Joss, D T, additional, Andgren, K, additional, Auranen, K, additional, Bönig, S, additional, Cox, D, additional, Darby, I G, additional, Doncel, M, additional, Eeckhaudt, S, additional, Greenlees, P T, additional, Hadinia, B, additional, Herzáň, A, additional, Jakobsson, U, additional, Jones, P, additional, Juutinen, S, additional, Ketelhut, S, additional, Konki, J, additional, Kröll, T, additional, Leppänen, A-P, additional, Nyman, M, additional, Page, R D, additional, Pakarinen, J, additional, Partanen, J, additional, McPeake, C G, additional, O’Donnell, D, additional, Peura, P, additional, Rahkila, P, additional, Ruotsalainen, P, additional, Sandzelius, M, additional, Sarén, J, additional, Saygı, B, additional, Scholey, C, additional, Simpson, J, additional, Sorri, J, additional, Taylor, M J, additional, Thornthwaite, A, additional, and Uusitalo, J, additional

Published
2021
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54. Isomeric 13/2+ (νi13/2−1) state in 211Th

Author

Auranen, K., Uusitalo, J., Badran, H., Grahn, T., Greenlees, P. T., Herzáň, A., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., Leppänen, A.-P., O'Neill, G., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., Sinclair, L., Sorri, J., Stolze, S., and Voss, A.

Subjects
ydinfysiikka
Abstract

Using a fusion-evaporation reaction and a gas-filled recoil separator, an isomeric state [T12=83(8)μs] with a most likely spin and parity of 132+ has been identified in Th211. The isomeric state is mainly depopulated via a hindered internal M2 transition [B(M2)=0.0025(5) W.u.], but also a weak α-decay branch of 4(3)% was observed. The present observations fit well to the systematic pattern set by the previously identified states of the same spin and parity in this region of the nuclear chart. peerReviewed

Published
2021

55. Identification of sub-μs isomeric states in the odd-odd nucleus 178Au

Author

Gillespie, S. A., Stott, A., Andreyev, A. N., Cubiss, J. G., Al Monthery, M., Barton, C. J., Antalic, S., Auranen, K., Badran, H., Cox, D., Grahn, T., Greenlees, P. T., Herzan, A., Higgins, E., Julin, R., Juutinen, S., Klimo, J., Konki, J., Leino, M., Mallaburn, M., Pakarinen, J., Papadakis, P., Partanen, J., Prajapati, P. M., Rahkila, P., Sandzelius, M., Scholey, C., Sorri, J., Stolze, S., Urban, R., Uusitalo, J., Venhart, M., and Wearing, F.

Subjects
isotoopit, Nuclear Experiment, ydinfysiikka, kulta
Abstract

The neutron-deficient gold (Z=79) isotopes in the vicinity of the neutron midshell N=104 provide prolific examples of shape coexistence and isomerism at low excitation energy. They can be probed via a number of different experimental techniques. In this study, two new isomeric states with half-lives of 294(7) and 373(9) ns have been observed in the neutron-deficient odd-odd nuclide 178Au (N=99) in an experiment at the RITU gas-filled separator at JYFL, Jyväskylä. This result was achieved due to the use of a segmented planar germanium detector with a high efficiency at low energies. By applying the recoil-decay tagging technique, they were assigned to decay to two different long-lived α-decaying states in 178Au. peerReviewed

Published
2021

56. Identification of excited states in $_{52}^{107}\mathrm{Te}_{55}$

Author

Zhang, W., Cederwall, B., Qi, C., Ertoprak, A., Aktas, Ö., Liu, X., Andgren, K., Auranen, K., Bäck, T., Barber, L., Beeton, G., Cullen, D.M., Darby, I.G., Dimmock, M.R., Eeckhaudt, S., Ganioğlu, E., Górska, M., Grahn, T., Greenlees, P.T., Hadinia, B., Ideguchi, E., Illana, A., Jones, P.M., Joss, D.T., Julin, R., Juutinen, S., Keatings, J.M., Khaplanov, A., Kulali, F., Leino, M., Luoma, M., Lv, B., Nara Singh, B.S., Nelson, L., Niikura, M., Nyman, M., Ojala, J., Page, R.D., Pakarinen, J., Paul, E.S., Petrache, C., Petri, M., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., Smith, J.F., Sorri, J., Tann, H., Zimba, G., Uusitalo, J., Wadsworth, R., Wyss, R., 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; Excited states in the extremely neutron-deficient nucleus Te107 have been identified from two separate experiments using the recoil-decay tagging technique. Two connected structures were observed on the basis of γγ-coincidence relations and tentatively assigned as built on the mixed-parentage νg7/2d5/2 and νh11/2 intruder configurations. The observed structures were compared with large-scale shell-model calculations and total Routhian surface calculations. Collective behavior was discovered to persist in the νh11/2 band of Te107 which highlights the shape-polarizing effect of a single valence neutron occupying the h11/2 intruder orbit as the N=50 shell closure is approached.

Published
2021

57. Identification of excited states in 107,52Te55

Author

Zhang, W., Cederwall, B., Qi, C., Ertoprak, A., Aktas, Ö., Liu, X., Andgren, K., Auranen, K., Bäck, T., Barber, L., Beeton, G., Cullen, D. M., Darby, I. G., Dimmock, M. R., Eeckhaudt, S., Ganioğlu, E., Górska, M., Grahn, T., Greenlees, P. T., Hadinia, B., Ideguchi, E., Illana, A., Jones, P. M., Joss, D. T., Julin, R., Juutinen, S., Keatings, J. M., Khaplanov, A., Kulali, F., Leino, M., Luoma, M., Lv, B., Nara Singh, B. S., Nelson, L., Niikura, M., Nyman, M., Ojala, J., Page, R. D., Pakarinen, J., Paul, E. S., Petrache, C., Petri, M., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., Smith, J. F., Sorri, J., Tann, H., Zimba, G., Uusitalo, J., Wadsworth, R., and Wyss, R.

Subjects
isotoopit, telluuri, nuclear physics, nuclear structure, ydinfysiikka
Abstract

Excited states in the extremely neutron-deficient nucleus 107Te have been identified from two separate experiments using the recoil-decay tagging technique. Two connected structures were observed on the basis of γγ-coincidence relations and tentatively assigned as built on the mixed-parentage νg7/2d5/2 and νh11/2 intruder configurations. The observed structures were compared with large-scale shell-model calculations and total Routhian surface calculations. Collective behavior was discovered to persist in the νh11/2 band of 107Te which highlights the shape-polarizing effect of a single valence neutron occupying the h11/2 intruder orbit as the N=50 shell closure is approached. peerReviewed

Published
2021

58. Tilted precession bands in $^{135}$Nd

Author

Lv, B.F., Petrache, C.M., Lawrie, E.A., Astier, A., Dupont, E., Zheng, K.K., Greenlees, P., Badran, H., Calverley, T., Cox, D.M., Grahn, T., Hilton, J., Julin, R., Juutinen, S., Konki, J., Pakarinen, J., Papadakis, P., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Uusitalo, J., Cederwall, B., Ertoprak, A., Liu, H., Guo, S., Wang, J.G., Ong, H.J., Zhou, X.H., Sun, Z.Y., Kuti, I., Timár, J., Tucholski, A., Srebrny, J., Andreoiu, C., 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ydinfysiikka, Nuclear Structure
Abstract

International audience; Two new excited bands built on the πh11/2 configuration have been identified in Nd135 in addition to the known πh11/2 band. The energy spectra of the excited bands and the available electromagnetic transition probabilities are in good agreement with theoretical results obtained using quasiparticle-plus-triaxial-rotor model calculations. The properties of the bands identify them as tilted precession bands instead of wobbling bands. Our results give a new insight into the interpretation of the low-lying bands in odd-A mass nuclei, and can stimulate future studies to address the nuclear triaxiality.

Published
2021

59. Tilted precession bands in ¹³⁵Nd

Author

Lv, B. F. (B. F.), Petrache, C. M. (C. M.), Lawrie, E. A. (E. A.), Astier, A. (A.), Dupont, E. (E.), Zheng, K. K. (K. K.), Greenlees, P. (P.), Badran, H. (H.), Calverley, T. (T.), Cox, D. M. (D. M.), Grahn, T. (T.), Hilton, J. (J.), Julin, R. (R.), Juutinen, S. (S.), Konki, J. (J.), Pakarinen, J. (J.), Papadakis, P. (P.), Partanen, J. (J.), Rahkila, P. (P.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Saren, J. (J.), Scholey, C. (C.), Sorri, J. (J.), Stolze, S. (S.), Uusitalo, J. (J.), Cederwall, B. (B.), Ertoprak, A. (A.), Liu, H. (H.), Guo, S. (S.), Wang, J. G. (J. G.), Ong, H. J. (H. J.), Zhou, X. H. (X. H.), Sun, Z. Y. (Z. Y.), Kuti, I. (I.), Timár, J. (J.), Tucholski, A. (A.), Srebrny, J. (J.), and Andreoiu, C. (C.)

Abstract

Two new excited bands built on the πh11/2 configuration have been identified in ¹³⁵Nd in addition to the known πh11/2 band. The energy spectra of the excited bands and the available electromagnetic transition probabilities are in good agreement with theoretical results obtained using quasiparticle-plus-triaxial-rotor model calculations. The properties of the bands identify them as tilted precession bands instead of wobbling bands. Our results give a new insight into the interpretation of the low-lying bands in odd-A mass nuclei, and can stimulate future studies to address the nuclear triaxiality.

Published
2021

60. Lifetime measurements of excited states in Os-169,Os-171,Os-173: Persistence of anomalous B(E2) ratios in transitional rare earth nuclei in the presence of a decoupled i(13/2) valence neutron

Author

Zhang, W., Cederwall, B., Doncel, M., Aktas, O., Ertoprak, A., Liotta, R., Qi, C., Grahn, T., Singh, B. S. Nara, Cullen, D. M., Hodge, D., Giles, M., Stolze, S., Badran, H., Braunroth, T., Calverley, T., Cox, D. M., Fang, Y. D., Greenlees, P. T., Hilton, J., Ideguchi, E., Julin, R., Juutinen, S., Raju, M. Kumar, Li, H., Liu, H., Matta, S., Subramaniam, P., Modamio, V, Pakarinen, J., Papadakis, P., Partanen, J., Petrache, C. M., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Taylor, M. J., Uusitalo, J., Valiente-Dobon, J. J., Zhang, W., Cederwall, B., Doncel, M., Aktas, O., Ertoprak, A., Liotta, R., Qi, C., Grahn, T., Singh, B. S. Nara, Cullen, D. M., Hodge, D., Giles, M., Stolze, S., Badran, H., Braunroth, T., Calverley, T., Cox, D. M., Fang, Y. D., Greenlees, P. T., Hilton, J., Ideguchi, E., Julin, R., Juutinen, S., Raju, M. Kumar, Li, H., Liu, H., Matta, S., Subramaniam, P., Modamio, V, Pakarinen, J., Papadakis, P., Partanen, J., Petrache, C. M., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Taylor, M. J., Uusitalo, J., and Valiente-Dobon, J. J.

Abstract

Lifetimes of low-lying excited states in the nu i(13/2+) bands of the neutron-deficient osmium isotopes 169,171,173Os have been measured for the first time using the recoil-distance Doppler shift and recoil-isomer tagging techniques. An unusually low value is observed for the ratio B(E2; 21/2(+) -> 17/2+)/B(E2; 17/2+ -> 13/2+) in 169Os, similar to the anomalously low values of the ratio B(E2; 4+1 -> 2+1 )/B(E2; 2(1)(+) -> 0(gs)(+)) previously observed in several transitional rare-earth nuclides with even numbers of neutrons and protons, including the neighbouring 168,170Os. Furthermore, the evolution of B(E2; 21/2(+) -> 17/2(+))/B(E2; 17/2(+) -> 13/2(+)) with increasing neutron number in the odd-mass isotopic chain 169,171,173Os is observed to follow the same trend as observed previously in the eveneven Os isotopes. These findings indicate that the possible quantum phase transition from a seniority conserving structure to a collective regime as a function of neutron number suggested for the even-even systems is maintained in these odd-mass osmium nuclei, with the odd valence neutron merely acting as a spectator. As for the even-even nuclei, the phenomenon is highly unexpected for nuclei that are not situated near closed shells. (C) 2021 The Author(s). Published by Elsevier B.V.

Published
2021

61. Lifetime measurements of excited states in 169,171,173Os:persistence of anomalous B(E2) ratios in transitional rare earth nuclei in the presence of a decoupled i13/2 valence neutron

Author

Zhang, W. (W.), Cederwall, B. (B.), Doncel, M. (M.), Aktas, O. (O.), Ertoprak, A. (A.), Liotta, R. (R.), Qi, C. (C.), Grahn, T. (T.), Singh, B. S. (B. S. Nara), Cullen, D. M. (D. M.), Hodge, D. (D.), Giles, M. (M.), Stolze, S. (S.), Badran, H. (H.), Braunroth, T. (T.), Calverley, T. (T.), Cox, D. M. (D. M.), Fang, Y. D. (Y. D.), Greenlees, P. T. (P. T.), Hilton, J. (J.), Ideguchi, E. (E.), Julin, R. (R.), Juutinen, S. (S.), Raju, M. K. (M. Kumar), Li, H. (H.), Liu, H. (H.), Matta, S. (S.), Subramaniam, P. (P.), Modamio, V. (V), Pakarinen, J. (J.), Papadakis, P. (P.), Partanen, J. (J.), Petrache, C. M. (C. M.), Rahkila, P. (P.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Saren, J. (J.), Scholey, C. (C.), Sorri, J. (J.), Taylor, M. J. (M. J.), Uusitalo, J. (J.), Valiente-Dobon, J. J. (J. J.), Zhang, W. (W.), Cederwall, B. (B.), Doncel, M. (M.), Aktas, O. (O.), Ertoprak, A. (A.), Liotta, R. (R.), Qi, C. (C.), Grahn, T. (T.), Singh, B. S. (B. S. Nara), Cullen, D. M. (D. M.), Hodge, D. (D.), Giles, M. (M.), Stolze, S. (S.), Badran, H. (H.), Braunroth, T. (T.), Calverley, T. (T.), Cox, D. M. (D. M.), Fang, Y. D. (Y. D.), Greenlees, P. T. (P. T.), Hilton, J. (J.), Ideguchi, E. (E.), Julin, R. (R.), Juutinen, S. (S.), Raju, M. K. (M. Kumar), Li, H. (H.), Liu, H. (H.), Matta, S. (S.), Subramaniam, P. (P.), Modamio, V. (V), Pakarinen, J. (J.), Papadakis, P. (P.), Partanen, J. (J.), Petrache, C. M. (C. M.), Rahkila, P. (P.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Saren, J. (J.), Scholey, C. (C.), Sorri, J. (J.), Taylor, M. J. (M. J.), Uusitalo, J. (J.), and Valiente-Dobon, J. J. (J. J.)

Abstract

Lifetimes of low-lying excited states in the vi13/2⁺ bands of the neutron-deficient osmium isotopes 169,171,173Os have been measured for the first time using the recoil-distance Doppler shift and recoil-isomer tagging techniques. An unusually low value is observed for the ratio B(E2; 21/2⁺ → 17/2⁺) /B(E2; 17/2⁺ → 13/2⁺) in 169Os, similar to the “anomalously” low values of the ratio B(E2; 4⁺1 → 2⁺1 )/B(E2; 2⁺1 → 0⁺gs) previously observed in several transitional rare-earth nuclides with even numbers of neutrons and protons, including the neighboring 168,170Os. Furthermore, the evolution of B(E2; 21/2⁺→ 17/2⁺)/B(E2; 17/2⁺ → 13/2⁺) with increasing neutron number in the odd-mass isotopic chain 169,171,173Os is observed to follow the same trend as observed previously in the even-even Os isotopes. These findings indicate that the possible quantum phase transition from a seniority conserving structure to a collective regime as a function of neutron number suggested for the even-even systems is maintained in these odd-mass osmium nuclei, with the odd valence neutron merely acting as a “spectator”. As for the even-even nuclei, the phenomenon is highly unexpected for nuclei that are not situated near closed shells.

Published
2021

62. Lifetimes of intruder states in 186Pb, 188Pb and 194Po

Author

Grahn, T., Dewald, A., Möller, O., Julin, R., Beausang, C.W., Christen, S., Darby, I.G., Eeckhaudt, S., Greenlees, P.T., Görgen, A., Helariutta, K., Jolie, J., Jones, P., Juutinen, S., Kettunen, H., Kröll, T., Krücken, R., Coz, Y. Le, Leino, M., Leppänen, A.-P., Maierbeck, P., Meyer, D.A., Melon, B., Nieminen, P., Nyman, M., Page, R.D., Pakarinen, J., Petkov, P., Rahkila, P., Saha, B., Sandzelius, M., Sarén, J., Scholey, C., Uusitalo, J., Bender, M., and Heenen, P.-H.

Published
2008
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63. [formula omitted]-Decay branching ratios measured by [formula omitted]-ray tagging

Author

Bianco, L., Page, R.D., Joss, D.T., Simpson, J., Cederwall, B., Gómez Hornillos, M.B., Greenlees, P.T., Hadinia, B., Jakobsson, U., Jones, P.M., Julin, R., Ketelhut, S., Labiche, M., Leino, M., Nyman, M., Paul, E.S., Petri, M., Peura, P., Puurunen, A., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sapple, P.J., Sarén, J., Scholey, C., Thomson, J., and Uusitalo, J.

Published
2008
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64. Population of a low-spin positive-parity band from high-spin intruder states in 177Au: The two-state mixing effect

Author

Venhart, M., Balogh, M., Herzáň, A., Wood, J.L., Ali, F.A., Joss, D.T., Andreyev, A.N., Auranen, K., Carroll, R.J., Drummond, M.C., Easton, J.L., Greenlees, P.T., Grahn, T., Gredley, A., Henderson, J., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Lawrie, E.A., Leino, M., Matoušek, V., McPeake, C.G., O'Donnell, D., Page, R.D., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Saygı, B., Sedlák, M., Scholey, C., Sorri, J., Stolze, S., Thornthwaite, A., Urban, R., Uusitalo, J., Veselský, M., and Wearing, F.P.

Published
2020
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65. Structure of rotational bands in 253No

Author

Herzberg, R. -D., Moon, S., Eeckhaudt, S., Greenlees, P. T., Butler, P. A., Page, T., Afanasjev, A. V., Amzal, N., Bastin, J. E., Becker, F., Bender, M., Bruyneel, B., Cocks, J. F. C., Darby, I. G., Dorvaux, O., Eskola, K., Gerl, J., Grahn, T., Gray-Jones, C., Hammond, N. J., Hauschild, K., Heenen, P. -H., Helariutta, K., Herzberg, A., Hessberger, F., Houry, M., Hürstel, A., Humphreys, R. D., Jones, G. D., Jones, P. M., Julin, R., Juutinen, S., Kankaanpää, H., Kettunen, H., Khoo, T. L., Korten, W., Kuusiniemi, P., LeCoz, Y., Leino, M., Leppänen, A. -P., Lister, C. J., Lucas, R., Muikku, M., Nieminen, P., Nyman, M., Page, R. D., Page, T., Pakarinen, J., Pritchard, A., Rahkila, P., Reiter, P., Sandzelius, M., Saren, J., Schlegel, Ch., Scholey, C., Theisen, Ch., Trzaska, W. H., Uusitalo, J., Wiens, A., and Wollersheim, H. J.

Published
2009
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66. Lifetime measurement in 195Po

Author

Grahn, T., Dewald, A., Greenlees, P. T., Jakobsson, U., Jolie, J., Jones, P., Julin, R., Juutinen, S., Ketelhut, S., Kröll, T., Krücken, R., Leino, M., Maierbeck, P., Melon, B., Nyman, M., Page, R. D., Peura, P., Pissulla, Th., Rahkila, P., Sarén, J., Scholey, C., Sorri, J., and Uusitalo, J.

Published
2009
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67. Isomeric 132+ (νi132−1) state in Th211

Author

Auranen, K., primary, Uusitalo, J., additional, Badran, H., additional, Grahn, T., additional, Greenlees, P. T., additional, Herzáň, A., additional, Jakobsson, U., additional, Julin, R., additional, Juutinen, S., additional, Konki, J., additional, Leino, M., additional, Leppänen, A.-P., additional, O'Neill, G., additional, Pakarinen, J., additional, Papadakis, P., additional, Partanen, J., additional, Peura, P., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scholey, C., additional, Sinclair, L., additional, Sorri, J., additional, Stolze, S., additional, and Voss, A., additional

Published
2021
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68. Tilted precession bands in Nd135

Author

Lv, B. F., primary, Petrache, C. M., additional, Lawrie, E. A., additional, Astier, A., additional, Dupont, E., additional, Zheng, K. K., additional, Greenlees, P., additional, Badran, H., additional, Calverley, T., additional, Cox, D. M., additional, Grahn, T., additional, Hilton, J., additional, Julin, R., additional, Juutinen, S., additional, Konki, J., additional, Pakarinen, J., additional, Papadakis, P., additional, Partanen, J., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Saren, J., additional, Scholey, C., additional, Sorri, J., additional, Stolze, S., additional, Uusitalo, J., additional, Cederwall, B., additional, Ertoprak, A., additional, Liu, H., additional, Guo, S., additional, Wang, J. G., additional, Ong, H. J., additional, Zhou, X. H., additional, Sun, Z. Y., additional, Kuti, I., additional, Timár, J., additional, Tucholski, A., additional, Srebrny, J., additional, and Andreoiu, C., additional

Published
2021
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69. Identification of sub- μs isomeric states in the odd-odd nucleus Au178

Author

Gillespie, S. A., primary, Stott, A., additional, Andreyev, A. N., additional, Cubiss, J. G., additional, Al Monthery, M., additional, Barton, C. J., additional, Antalic, S., additional, Auranen, K., additional, Badran, H., additional, Cox, D., additional, Grahn, T., additional, Greenlees, P. T., additional, Herzan, A., additional, Higgins, E., additional, Julin, R., additional, Juutinen, S., additional, Klimo, J., additional, Konki, J., additional, Leino, M., additional, Mallaburn, M., additional, Pakarinen, J., additional, Papadakis, P., additional, Partanen, J., additional, Prajapati, P. M., additional, Rahkila, P., additional, Sandzelius, M., additional, Scholey, C., additional, Sorri, J., additional, Stolze, S., additional, Urban, R., additional, Uusitalo, J., additional, Venhart, M., additional, and Wearing, F., additional

Published
2021
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70. In-beam gamma-ray spectroscopy of 190, 197Po

Author

Wiseman, D. R., Andreyev, A. N., Page, R. D., Smith, M. B., Darby, I. G., Eeckhaudt, S., Grahn, T., Greenlees, P. T., Jones, P., Julin, R., Juutinen, S., Kettunen, H., Leino, M., Leppänen, A. -P., Nyman, M., Pakarinen, J., Rahkila, P., Sandzelius, M., Sarén, J., Scholey, C., and Uusitalo, J.

Published
2007
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71. Excited states in Ra-217 populated in the alpha decay of Th-221

Author

Parr, E, Smith, JF, Greenlees, PT, Auranen, K, Chapman, R, Cullen, DM, Grahn, T, Grocutt, L, Herzan, A, Herzberg, R-D, Hodge, D, Jakobsson, U, Julin, R, Juutinen, S, Konki, J, McPeake, C, Mengoni, D, Mistry, AK, Mulholland, KF, O'Neill, GG, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Saren, J, Scheck, M, Scholey, C, Siciliano, M, Smolen, M, Sorri, J, Stolze, S, Taylor, MJ, and Uusitalo, J

Published
2020

72. Population of a low-spin positive-parity band from high-spin intruder states in Au: The two-state mixing effect

Author

Venhart, M., Balogh, M., Herzáň, A., Wood, J.L., Ali, F.A., Joss, D.T., Andreyev, A.N., Auranen, K., Carroll, R.J., Drummond, M.C., Easton, J.L., Greenlees, P.T., Grahn, T., Gredley, A., Henderson, J., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Lawrie, E.A., Leino, M., Matoušek, V., McPeake, C.G., O'Donnell, D., Page, R.D., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Saygı, B., Sedlák, M., Scholey, C., Sorri, J., Stolze, S., Thornthwaite, A., Urban, R., Uusitalo, J., Veselský, M., and Wearing, F.P.

Abstract

The extremely neutron-deficient isotopes $^{177,179}$Au were studied by means of in-beam γ-ray spectroscopy. Specific tagging techniques, α-decay tagging in $^{177}$Au and isomer tagging in $^{179}$Au, were used for these studies. Feeding of positive-parity, nearly spherical states, which are associated with 2d3/2 and 3s1/2 proton-hole configurations, from the 1i13/2 proton-intruder configuration was observed in $^{177}$Au. Such a decay path has no precedent in odd-Au isotopes and it is explained by the effect of mixing of wave functions of the initial state.

Published
2020

73. High-spin states of Th-218

Author

O'Donnell, D, Page, RD, Grahn, T, Ali, FA, Auranen, K, Capponi, L, Carroll, RJ, Chishti, MMR, Drummond, MC, Greenlees, PT, Henderson, J, Herzan, A, Jakobsson, U, Joss, DT, Julin, R, Juutinen, S, Konki, J, Labiche, M, Leino, M, Mason, PJR, McPeake, CG, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Revill, J, Ruotsalainen, P, Sandzelius, M, Saren, J, Saygi, B, Scholey, C, Simpson, J, Smith, JF, Smolen, M, Sorri, J, Stolze, S, Sullivan, CM, Thornthwaite, A, Uusitalo, J, Kumar, A, and Srivastava, PC

Published
2020

74. Multiple chiral bands in Nd-137

Author

Petrache, CM, Lv, BF, Chen, QB, Meng, J, Astier, A, Dupont, E, Zheng, KK, Greenlees, PT, Badran, H, Calverley, T, Cox, DM, Grahn, T, Hilton, J, Julin, R, Juutinen, S, Konki, J, Pakarinen, J, Papadakis, P, Partanen, J, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Saren, J, Scholey, C, Sorri, J, Stolze, S, Uusitalo, J, Cederwall, B, Ertoprak, A, Liu, H, Guo, S, Wang, JG, Zhou, XH, Kuti, I, Timar, J, Tucholski, A, Srebrny, J, and Andreoiu, C

Published
2020

75. In-beam gamma-ray and electron spectroscopy of Md-249,Md-251

Author

Briselet, R, Theisen, Ch, Sulignano, B, Airiau, M, Auranen, K, Cox, DM, Dechery, F, Drouart, A, Favier, Z, Gall, B, Goigoux, T, Grahn, T, Greenlees, PT, Hauschild, K, Herzan, A, Herzberg, R-D, Jakobsson, U, Julin, R, Juutinen, S, Konki, J, Leino, M, Lopez-Martens, A, Mistry, A, Nieminen, P, Pakarinen, J, Papadakis, P, Peura, P, Rey-Herme, E, Rahkila, P, Rubert, J, Ruotsalainen, P, Sandzelius, M, Saren, J, Scholey, C, Sorri, J, Stolze, S, Uusitalo, J, Vandebrouck, M, Ward, A, Zielinska, M, Bally, B, Bender, M, and Ryssens, W

Published
2020

76. Evidence for octupole collectivity in Pt-172

Author

Ertoprak, A., Cederwall, B., Qi, C., Aktas, O., Doncel, M., Hadinia, B., Liotta, R., Sandzelius, M., Scholey, C., Andgren, K., Back, T., Badran, H., Braunroth, T., Calverley, T., Cox, D. M., Cullen, D. M., Fang, Y. D., Ganioglu, E., Giles, M., Gomez Hornillos, M. B., Grahn, T., Greenlees, P. T., Hilton, J., Hodge, D., Ideguchi, E., Jakobsson, U., Johnson, A., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Khaplanov, A., Kumar Raju, M., Leino, M., Li, H., Liu, H., Matta, S., Modamio, V., Nara Singh, B. S., Niikura, M., Nyman, M., Ozgur, I., Page, R. D., Pakarinen, J., Papadakis, P., Partanen, J., Paul, E. S., Petrache, C. M., Peura, P., Rahkila, P., Ruotsalainen, P., Saren, J., Sorri, J., Stolze, S., Subramaniam, P., Taylor, M. J., Uusitalo, J., Valiente-Dobon, J. J., Wyss, R., and Department of Chemistry

Subjects
COEXISTENCE, NUCLEI, SPECTROMETERS, MOMENTS, SHAPES, INSTABILITY, 116 Chemical sciences, EXCITED-STATE, MASS, 114 Physical sciences, TRANSITION, GAMMA-RAY SPECTROSCOPY
Abstract

Excited states in the extremely neutron-deficient nucleus Pt-172 were populated via Ru-96(Kr-78, 2p) and Mo-92(Kr-83, 3n) reactions. The level scheme has been extended up to an excitation energy of approximate to 5MeV and tentative spin-parity assignments up to I-pi = 18(+). Linear polarization and angular distribution measurements were used to determine the electromagnetic E1 character of the dipole transitions connecting the positive-parity ground-state band with an excited side-band, firmly establishing it as a negativeparity band. The lowestmember of this negative-parity structure was firmly assigned spin-parity 3(-). In addition, we observed an E3 transition from this 3(-) state to the ground state, providing direct evidence for octupole collectivity in Pt-172. Large-scale shell model (LSSM) and total Routhian surface (TRS) calculations have been performed, supporting the interpretation of the 3(-) state as a collective octupole-vibrational state.

Published
2020

77. Evidence for octupole collectivity in $$^{172}{\mathrm {Pt}}$$172Pt

Author

Ertoprak, A, Cederwall, B, Qi, C, Aktas, Ö, Doncel, M, Hadinia, B, Liotta, R, Sandzelius, M, Scholey, C, Andgren, K, Bäck, T, Badran, H, Braunroth, T, Calverley, T, Cox, DM, Cullen, DM, Fang, YD, Ganioğlu, E, Giles, M, Gomez Hornillos, MB, Grahn, T, Greenlees, PT, Hilton, J, Hodge, D, Ideguchi, E, Jakobsson, U, Johnson, A, Jones, PM, Julin, R, Juutinen, S, Ketelhut, S, Khaplanov, A, Kumar Raju, M, Leino, M, Li, H, Liu, H, Matta, S, Modamio, V, Nara Singh, BS, Niikura, M, Nyman, M, Özgür, I, Page, RD, Pakarinen, J, Papadakis, P, Partanen, J, Paul, ES, Petrache, CM, Peura, P, Rahkila, P, Ruotsalainen, P, Sarén, J, Sorri, J, Stolze, S, Subramaniam, P, Taylor, MJ, Uusitalo, J, Valiente-Dobón, JJ, and Wyss, R

Published
2020

78. Delayed or absent π(h11/2)2 alignment in Xe 111

Author

Capponi, L., Smith, J. F., Ruotsalainen, P., Scholey, C., Rahkila, P., Bianco, L., Boston, A. J., Boston, H. C., Cullen, D. M., Derkx, X., Drummond, M. C., Grahn, T., Greenlees, P. T., Grocutt, L., Hadinia, B., Jakobsson, U., Joss, D. T., Julin, R., Juutinen, S., Labiche, M., Leino, M., Leach, K. G., McPeake, C., Mulholland, K. F., Nieminen, P., O'Donnell, D., Paul, E. S., Peura, P., Sandzelius, M., Sarén, J., Saygi, B., Sorri, J., Stolze, S., Thornthwaite, A., Taylor, M. J., and Uusitalo, J.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Excited states have been identified in the very neutron-deficient N=Z+3 nucleus Xe111 for the first time, using the Ni58(Ni58,αn) heavy-ion fusion-evaporation reaction. γ-ray transitions have been unambiguously assigned to Xe111 by correlation with the characteristic Xe111→Te107→Sn103 α-decay chain using the method of recoil-decay tagging. Inspection of γγ-coincidence data has shown that five of the transitions form a rotational-like sequence. Excitation-energy systematics suggest that the sequence could be the favored signature partner of a band built on an h11/2 neutron. Aligned angular momenta of states in the band have been compared to analogous bands in neighboring xenon isotopes. The aligned angular momenta for the Xe111 band are constant over the range of observed rotational frequencies, suggesting that the first π(h11/2)2 alignment is either delayed or absent. It is speculated that the alignment of h11/2 protons in the presence of neutrons in near-identical h11/2 orbitals may be affected by neutron-proton interactions or by the onset of octupole correlations.

Published
2020

79. Delayed or absent pi(h(11/2))(2) alignment in Xe-111

Author

Capponi, L, Smith, JF, Ruotsalainen, P, Scholey, C, Rahkila, P, Bianco, L, Boston, AJ, Boston, HC, Cullen, DM, Derkx, X, Drummond, MC, Grahn, T, Greenlees, PT, Grocutt, L, Hadinia, B, Jakobsson, U, Joss, DT, Julin, R, Juutinen, S, Labiche, M, Leino, M, Leach, KG, McPeake, C, Mulholland, KF, Nieminen, P, O'Donnell, D, Pa, ES ul, Peura, P, Sandzelius, M, Saren, J, Saygi, B, Sorri, J, Stolze, S, Thornthwaite, A, Taylor, MJ, and Uusitalo, J

Published
2020

80. Stability of the heaviest elements: K isomer in No-250

Author

Kallunkathariyil, J, Sulignano, B, Greenlees, PT, Khuyagbaatar, J, Theisen, Ch, Auranen, K, Badran, H, Bisso, F, Brionnet, P, Briselet, R, Drouart, A, Favier, Z, Goigoux, T, Grahn, T, Hauschild, K, Herzan, A, Hessberger, FP, Jakobsson, U, Julin, R, Juutinen, S, Konki, J, Leino, M, Lightfoot, A, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Rezynkina, K, Ruotsalainen, P, Sandzelius, M, Saren, J, Scholey, C, Siciliano, M, Sorri, J, Stolze, S, Svirikhin, AI, Uusitalo, J, Vandebrouck, M, Ward, A, Wraith, C, and Zielinska, M

Published
2020

81. Excited states in 217Ra populated in the α decay of 221Th

Author

Parr, E., Smith, J. F., Greenlees, P. T., Auranen, K., Chapman, R., Cullen, D. M., Grahn, T., Grocutt, L., Herzáň, A., Herzberg, R.-D., Hodge, D., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., McPeake, C., Mengoni, D., Mistry, A. K., Mulholland, K. F., O'Neill, G. G., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scheck, M., Scholey, C., Siciliano, M., Smolen, M., Sorri, J., Stolze, S., Taylor, M. J., and Uusitalo, J.

Subjects
alpha decay, energy levels and level densities, ydinfysiikka, nuclear structure and decays
Abstract

Fine structure in the α decay of 22190Th, populating excited states in 21788Ra, was studied using αγ-coincidence spectroscopy. Two α-decay branches from 221Th have been newly observed, with Eα(keV)[bα(%)]=7951(8)[0.14(3)] and 8247(3)[1.51(12)], together with three previously known branches. Also, two new states in 217Ra were identified at E = 177 and 227 keV. The ground-state configurations of the odd-A, N = 131 transitional isotones above 208Pb are interpreted from their α-decay fine structure systematics and considered in terms of predictions using spherical shell and reflection-asymmetric models. peerReviewed

Published
2020

82. 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

83. Isomeric 13/2+ state in 201Fr

Author

Auranen, K., Jakobsson, U., Badran, H., Grahn, T., Greenlees, P. T., Herzán, A., Julin, R., Juutinen, S., Konki, J., Leino, M., Leppänen, A.-P., O'Neill, G., Pakarinen, J., Papadakis, P., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., Sinclair, L., Sorri, J., Stolze, S., Uusitalo, J., and Voss, A.

Subjects
lifetimes and widths, alpha decay, energy levels and level densities, nuclear spin and parity, isomer decays, ydinfysiikka, nuclear structure and decays
Abstract

We have identified an isomeric state in 201Fr for which we propose a spin and parity of 13/2 +, and interpret it as arising from the π(i13/2 ) configuration. A half-life of 720(40) ns was measured, corresponding to B(M2) = 0.17(2) W.u., in good agreement with those of other 13/2 + → 9/2 − [π(i13/2 ) → π(h9/2 )] transitions observed in other nuclei in the region. The nuclei of interest were produced in a fusion-evaporation reaction and their decay properties were investigated using the GREAT spectrometer at the focal plane of the RITU gas-filled recoil separator. peerReviewed

Published
2020

84. Exploring the boundaries of the nuclear landscape : α-decay properties of 211Pa

Author

Auranen, K., Uusitalo, J., Badran, H., Grahn, T., Greenlees, P. T., Herzáň, A., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., Leppänen, A.-P., O'Neill, G., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., Sinclair, L., Sorri, J., Stolze, S., and Voss, A.

Subjects
lifetimes and widths, isotoopit, alpha decay, proton emission, rare and new isotopes, nuclear spin and parity, High Energy Physics::Experiment, ydinfysiikka, nuclear structure and decays, binding energy and masses, nuclear binding
Abstract

Employing the recoil ion transport unit (RITU) and a fusion-evaporation reaction, the α decay of 211Pa has been identified via the implantation-decay correlation technique through observation of chains up to four consecutive decays. An α-particle energy and half-life of 8320(40) keV and 3.8+4.6−1.4 ms, respectively, were measured, corresponding to favored α decay. In addition, more precise α-decay properties of 212Pa and 213Pa were obtained due to accumulated statistics. The present data were compared to those predicted by selected atomic mass models and it was used to estimate the possibility of observing proton emission from these isotopes. peerReviewed

Published
2020

85. In-beam γ-ray and electron spectroscopy of Md249,251

Author

Briselet, R., Theisen, Ch., Sulignano, B., Airiau, M., Auranen, K., Cox, D. M., Déchery, F., Drouart, A., Favier, Z., Gall, B., Goigoux, T., Grahn, T., Greenlees, P. T., Hauschild, K., Herzan, A., Herzberg, R.-D., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., Lopez-Martens, A., Mistry, A., Nieminen, P., Pakarinen, J., Papadakis, P., Peura, P., Rey-Herme, E., Rahkila, P., Rubert, J., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., Sorri, J., Stolze, S., Uusitalo, J., Vandebrouck, M., Ward, A., Zielińska, M., Bally, B., Bender, M., and Ryssens, W.

Subjects
electromagnetic transitions, spektroskopia, nuclear spin and parity, collective levels, ydinfysiikka
Abstract

The odd-Z 251Md nucleus was studied using combined γ-ray and conversion-electron in-beam spectroscopy. Besides the previously observed rotational band based on the [521]1/2− configuration, another rotational structure has been identified using γ−γ coincidences. The use of electron spectroscopy allowed the rotational bands to be observed over a larger rotational frequency range. Using the transition intensities that depend on the gyromagnetic factor, a [514]7/2− single-particle configuration has been inferred for this band, i.e., the ground-state band. A physical background that dominates the electron spectrum with an intensity of ≃60% was well reproduced by simulating a set of unresolved excited bands. Moreover, a detailed analysis of the intensity profile as a function of the angular momentum provided a method for deriving the orbital gyromagnetic factor, namely gK=0.69+0.19−0.16 for the ground-state band. The odd-Z 249Md was studied using γ-ray in-beam spectroscopy. Evidence for octupole correlations resulting from the mixing of the Δl=Δj=3 [521]3/2− and [633]7/2+ Nilsson orbitals were found in both 249,251Md. A surprising similarity of the 251Md ground-state band transition energies with those of the excited band of 255Lr has been discussed in terms of identical bands. Skyrme-Hartree-Fock-Bogoliubov calculations were performed to investigate the origin of the similarities between these bands. peerReviewed

Published
2020

86. Stability of the heaviest elements: $K$ isomer in $^{250}\mathrm{No}$

Author

Kallunkathariyil, J., Sulignano, B., Greenlees, P.T., Khuyagbaatar, J., Theisen, Ch., Auranen, K., Badran, H., Bisso, F., Brionnet, P., Briselet, R., Drouart, A., Favier, Z., Goigoux, T., Grahn, T., Hauschild, K., Herzan, A., Heßberger, F.P., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., Lightfoot, A., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Rezynkina, K., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Siciliano, M., Sorri, J., Stolze, S., Svirikhin, A.I., Uusitalo, J., Vandebrouck, M., Ward, A., Wraith, C., Zielińska, M., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-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), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Experiment, Nuclear Structure
Abstract

International audience; Decay spectroscopy of $^{250}\mathrm{No}$ has been performed using digital electronics and pulse-shape analysis of the fast nuclear decays for the first time. Previous studies of $^{250}\mathrm{No}$ reported two distinct fission decay lifetimes, related to the direct fission of the ground state and to the decay of an isomeric state but without the possibility to determine if the isomeric state decayed directly via fission or via internal electromagnetic transitions to the ground state. The data obtained in the current experiment allowed the puzzle to finally be resolved, attributing the shorter half-life of $t_{1/2}=3.8 \pm 0.3 \mu s$ to the ground state and the longer half-life $t_{1/2}=34.9^{+3.9}_{-3.2} \mu s$ to the decay of an isomeric state. $^{250}\mathrm{No}$ becomes, thus, one of a very few examples of very heavy nuclei with an isomeric state living considerably longer than its ground state. This phenomenon has important consequences for the nuclear-structure models aiming to determine the borders of the island of stability of superheavy elements.

Published
2020

87. High-spin states of ²¹⁸Th

Author

O'Donnell, D. (D.), Page, R. D. (R. D.), Grahn, T. (T.), Ali, F. A. (F. A.), Auranen, K. (K.), Capponi, L. (L.), Carroll, R. J. (R. J.), Chishti, M. M. (M. M. R.), Drummond, M. C. (M. C.), Greenlees, P. T. (P. T.), Henderson, J. (J.), Herzan, A. (A.), Jakobsson, U. (U.), Joss, D. T. (D. T.), Julin, R. (R.), Juutinen, S. (S.), Konki, J. (J.), Labiche, M. (M.), Leino, M. (M.), Mason, P. J. (P. J. R.), McPeake, C. G. (C. G.), Pakarinen, J. (J.), Papadakis, P. (P.), Partanen, J. (J.), Peura, P. (P.), Rahkila, P. (P.), Revill, J. (J.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Saren, J. (J.), Saygi, B. (B.), Scholey, C. (C.), Simpson, J. (J.), Smith, J. F. (J. F.), Smolen, M. (M.), Sorri, J. (J.), Stolze, S. (S.), Sullivan, C. M. (C. M.), Thornthwaite, A. (A.), Uusitalo, J. (J.), Kumar, A. (A.), and Srivastava, P. C. (P. C.)

Subjects
fusion-evaporation reactions, gamma-ray spectroscopy, shell model, alpha-decay, Nuclear Experiment, thorium
Abstract

High-spin states in the N = 128 nucleus ²¹⁸Th have been investigated following fusion–evaporation reactions, using the recoil-decay tagging technique. Due to the short-lived nature of the ground state of ²¹⁸Th prompt γ rays have been correlated with the α decay of the daughter nucleus ²¹⁴Ra. The level scheme representing the decay of excited states has been extended to (16⁺) with the observation of six previously unreported transitions. The observations are compared with the results of shell model calculations and within the context of the systematics of neighbouring nuclei.

Published
2020

88. 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., 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., ZIMBA, G., Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-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), and 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)

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

89. Excited states in Ra 217 populated in the +¦ decay of Th 221

Author

Parr, E., Smith, J. F., Greenlees, P. T., Auranen, K., Chapman, R., Cullen, D. M., Grahn, T., Grocutt, L., Herz+i+e, A., Herzberg, R. -D., Hodge, D., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Mcpeake, C., Mengoni, D., Mistry, A. K., Mulholland, K. F., O'Neill, G. G., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sar+¬n, J., Scheck, M., Scholey, C., Siciliano, M., Smolen, M., Sorri, J., Stolze, S., Taylor, M. J., and Uusitalo, J.

Published
2020

90. Signatures of enhanced octupole correlations at high spin in ¹³⁶Nd

Author

Petrache, C. M. (C. M.), Minkov, N. (N.), Nakatsukasa, T. (T.), Lv, B. F. (B. F.), Astier, A. (A.), Dupont, E. (E.), Zheng, K. K. (K. K.), Greenlees, P. (P.), Badran, H. (H.), Calverley, T. (T.), Cox, D. M. (D. M.), Grahn, T. (T.), Hilton, J. (J.), Julin, R. (R.), Juutinen, S. (S.), Konki, J. (J.), Pakarinen, J. (J.), Papadakis, P. (P.), Partanen, J. (J.), Rahkila, P. (P.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Saren, J. (J.), Scholey, C. (C.), Sorri, J. (J.), Stolze, S. (S.), Uusitalo, J. (J.), Cederwall, B. (B.), Ertoprak, A. (A.), Liu, H. (H.), Guo, S. (S.), Liu, M. L. (M. L.), Wang, J. G. (J. G.), Zhou, X. H. (X. H.), Kuti, I. (I), Timar, J. (J.), Tucholski, A. (A.), Srebrny, J. (J.), and Andreoiu, C. (C.)

Subjects
Nuclear Theory, Physics::Accelerator Physics, Physics::Atomic Physics
Abstract

Experimental signatures of moderately enhanced octupole correlations at high spin in ¹³⁶Nd are indicated for the first time. The extracted dipole moments of two negative-parity bands are only two times smaller than those of the lanthanide nuclei with N≈90 which present well-established octupole correlations. Calculations using the cranked quasiparticle random phase approximation and a model of quadrupole-octupole rotations with octupole vibrations reveal the structure of the bands and the enhanced octupole correlations at high spin in ¹³⁶Nd.

Published
2020

91. Delayed or absent π(h11/2)2 alignment in 111Xe

Author

Capponi, L., Smith, J. F., Ruotsalainen, P., Scholey, C., Rahkila, P., Bianco, L., Boston, A. J., Boston, H., Cullen, D. M., Derkx, X., Drummond, M. C., Grahn, T., Greenlees, P. T., Grocutt, L., Hadinia, B., Jakobsson, U., Joss, D. T., Julin, R., Juutinen, S., Labiche, M., Leino, M., Leach, K. G., McPeake, C., Mulholland, K. F., Nieminen, P., O'Donnell, D., Paul, E. S., Peura, P., Sandzelius, M., Sarén, J., Saygi, B., Sorri, J., Stolze, S., Thornthwaite, A., Taylor, M. J., and Uusitalo, J.

Subjects
Nuclear Theory, collective levels, Nuclear Experiment, ydinfysiikka, nuclear structure and decays
Abstract

Excited states have been identified in the very neutron-deficient N = Z + 3 nucleus 111Xe for the first time, using the 58Ni(58Ni, αn) heavy-ion fusion-evaporation reaction. γ -ray transitions have been unambiguously assigned to 111Xe by correlation with the characteristic 111Xe → 107Te → 103Sn α-decay chain using the method of recoil-decay tagging. Inspection of γ γ -coincidence data has shown that five of the transitions form a rotational-like sequence. Excitation-energy systematics suggest that the sequence could be the favored signature partner of a band built on an h11/2 neutron. Aligned angular momenta of states in the band have been compared to analogous bands in neighboring xenon isotopes. The aligned angular momenta for the 111Xe band are constant over the range of observed rotational frequencies, suggesting that the first π(h11/2 ) 2 alignment is either delayed or absent. It is speculated that the alignment of h11/2 protons in the presence of neutrons in near-identical h11/2 orbitals may be affected by neutron-proton interactions or by the onset of octupole correlations. peerReviewed

Published
2020

92. Signatures of enhanced octupole correlations at high spin in $^{136}\mathrm{Nd}$

Author

Petrache, C.M., Minkov, N., Nakatsukasa, T., Lv, B.F., Astier, A., Dupont, E., Zheng, K.K., Greenlees, P., Badran, H., Calverley, T., Cox, D.M., Grahn, T., Hilton, J., Julin, R., Juutinen, S., Konki, J., Pakarinen, J., Papadakis, P., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Uusitalo, J., Cederwall, B., Ertoprak, A., Liu, H., Guo, S., Liu, M.L., Wang, J.G., Zhou, X.H., Kuti, I., Timár, J., Tucholski, A., Srebrny, J., Andreoiu, C., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and 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)

Subjects
Nuclear Theory, Physics::Accelerator Physics, Physics::Atomic Physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure
Abstract

International audience; Experimental signatures of moderately enhanced octupole correlations at high spin in Nd136 are indicated for the first time. The extracted dipole moments of two negative-parity bands are only two times smaller than those of the lanthanide nuclei with N≈90 which present well-established octupole correlations. Calculations using the cranked quasiparticle random phase approximation and a model of quadrupole-octupole rotations with octupole vibrations reveal the structure of the bands and the enhanced octupole correlations at high spin in Nd136.

Published
2020

93. In-beam γ-ray and electron spectroscopy of ²⁴⁹,²⁵¹Md

Author

Briselet, R. (R.), Theisen, C. (Ch), Sulignano, B. (B.), Airiau, M. (M.), Auranen, K. (K.), Cox, D. M. (D. M.), Dechery, F. (F.), Drouart, A. (A.), Favier, Z. (Z.), Gall, B. (B.), Goigoux, T. (T.), Grahn, T. (T.), Greenlees, P. T. (P. T.), Hauschild, K. (K.), Herzan, A. (A.), Herzberg, R.-D. (R-D), Jakobsson, U. (U.), Julin, R. (R.), Juutinen, S. (S.), Konki, J. (J.), Leino, M. (M.), Lopez-Martens, A. (A.), Mistry, A. (A.), Nieminen, P. (P.), Pakarinen, J. (J.), Papadakis, P. (P.), Peura, P. (P.), Rey-Herme, E. (E.), Rahkila, P. (P.), Rubert, J. (J.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Saren, J. (J.), Scholey, C. (C.), Sorri, J. (J.), Stolze, S. (S.), Uusitalo, J. (J.), Vandebrouck, M. (M.), Ward, A. (A.), Zielinska, M. (M.), Bally, B. (B.), Bender, M. (M.), and Ryssens, W. (W.)

Abstract

The odd-Z ²⁵¹Md nucleus was studied using combined γ-ray and conversion-electron in-beam spectroscopy. Besides the previously observed rotational band based on the [521]1/2⁻ configuration, another rotational structure has been identified using γ−γ coincidences. The use of electron spectroscopy allowed the rotational bands to be observed over a larger rotational frequency range. Using the transition intensities that depend on the gyromagnetic factor, a [514]7/2⁻ single-particle configuration has been inferred for this band, i.e., the ground-state band. A physical background that dominates the electron spectrum with an intensity of ≃60% was well reproduced by simulating a set of unresolved excited bands. Moreover, a detailed analysis of the intensity profile as a function of the angular momentum provided a method for deriving the orbital gyromagnetic factor, namely \(g_{K}=0.69^{+0.19}_{−0.16}\) for the ground-state band. The odd-Z ²⁴⁹Md was studied using γ-ray in-beam spectroscopy. Evidence for octupole correlations resulting from the mixing of the Δl=Δj=3 [521]3/2⁻ and [633]7/2⁺ Nilsson orbitals were found in both ²⁴⁹,²⁵¹Md. A surprising similarity of the²⁵¹Md ground-state band transition energies with those of the excited band of ²⁵⁵Lr has been discussed in terms of identical bands. Skyrme-Hartree-Fock-Bogoliubov calculations were performed to investigate the origin of the similarities between these bands.

Published
2020

94. Stability of the heaviest elements : K isomer in 250No

Author

Kallunkathariyil, J., Sulignano, B., Greenlees, P. T., Khuyagbaatar, J., Theisen, Ch., Auranen, K., Badran, H., Bisso, F., Brionnet, P., Briselet, R., Drouart, A., Favier, Z., Goigoux, T., Grahn, T., Hauschild, K., Herzan, A., Heßberger, F. P., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., Lightfoot, A., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Rezynkina, K., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Siciliano, M., Sorri, J., Stolze, S., Svirikhin, A. I., Uusitalo, J., Vandebrouck, M., Ward, A., Wraith, C., and Zielińska, M.

Subjects
isomer decays, ydinfysiikka, nuclear structure and decays
Abstract

Decay spectroscopy of 250No has been performed using digital electronics and pulse-shape analysis of the fast nuclear decays for the first time. Previous studies of 250No reported two distinct fission decay lifetimes, related to the direct fission of the ground state and to the decay of an isomeric state but without the possibility to determine if the isomeric state decayed directly via fission or via internal electromagnetic transitions to the ground state. The data obtained in the current experiment allowed the puzzle to finally be resolved, attributing the shorter half-life of t1/2 = 3.8 ± 0.3 μs to the ground state and the longer half-life t1/2 = 34.9+3.9 −3.2 μs to the decay of an isomeric state. 250No becomes, thus, one of a very few examples of very heavy nuclei with an isomeric state living considerably longer than its ground state. This phenomenon has important consequences for the nuclear-structure models aiming to determine the borders of the island of stability of superheavy elements. peerReviewed

Published
2020

95. Delayed or absent pi(h(11/2))(2) alignment in Xe-111

Author

Capponi, L., Smith, J. F., Ruotsalainen, P., Scholey, C., Rahkila, P., Bianco, L., McPeake, C., and Ege Üniversitesi

Abstract

Excited states have been identified in the very neutron-deficient N = Z + 3 nucleus Xe-111 for the first time, using the Ni-58(Ni-58, alpha n) heavy-ion fusion-evaporation reaction. gamma-ray transitions have been unambiguously assigned to Xe-111 by correlation with the characteristic Xe-111 -> Te-107 -> Sn-103 alpha-decay chain using the method of recoil-decay tagging. Inspection of gamma gamma-coincidence data has shown that five of the transitions form a rotational-like sequence. Excitation-energy systematics suggest that the sequence could be the favored signature partner of a band built on an h(11/2) neutron. Aligned angular momenta of states in the band have been compared to analogous bands in neighboring xenon isotopes. the aligned angular momenta for the Xe-111 band are constant over the range of observed rotational frequencies, suggesting that the first pi(h(11/2))(2) alignment is either delayed or absent. It is speculated that the alignment of h(11/2) protons in the presence of neutrons in near-identical h(11/2) orbitals may be affected by neutron-proton interactions or by the onset of octupole correlations., Science and Technology Facilities Council (UK)Science & Technology Facilities Council (STFC) [ST/J000183/2, ST/L005808/1]; EUEuropean Union (EU) [262010]; Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL) [213503], This work was supported by the Science and Technology Facilities Council (UK) under Grants No. ST/J000183/2 (UWS) and No. ST/L005808/1 (UWS). It was also supported by the EU 7th Framework Programme "Integrating Activities-Transnational Access" Project No. 262010 (EN-SAR) and by the Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL; Contract No. 213503). the authors acknowledge the support of Gammapool for the loan of the Jurogam HPGe detectors.

Published
2020

96. Spectroscopy and single-particle structure of the odd- Z heavy elements 255Lr, 251Md and 247Es

Author

Chatillon, A., Theisen, Ch., Greenlees, P. T., Auger, G., Bastin, J. E., Bouchez, E., Bouriquet, B., Casandjian, J. M., Cee, R., Clément, E., Dayras, R., de France, G., de Toureil, R., Eeckhaudt, S., Görgen, A., Grahn, T., Grévy, S., Hauschild, K., Herzberg, R. -D., Ikin, P. J. C., Jones, G. D., Jones, P., Julin, R., Juutinen, S., Kettunen, H., Korichi, A., Korten, W., Le Coz, Y., Leino, M., Lopez-Martens, A., Lukyanov, S. M., Penionzhkevich, Yu. E., Perkowski, J., Pritchard, A., Rahkila, P., Rejmund, M., Saren, J., Scholey, C., Siem, S., Saint-Laurent, M. G., Simenel, C., Sobolev, Yu. G., Stodel, Ch., Uusitalo, J., Villari, A., Bender, M., Bonche, P., and Heenen, P. -H.

Published
2006
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97. Recoil-fission tagging of the transfermium nucleus 252No

Author

Leppänen, A. -P., Uusitalo, J., Greenlees, P. T., Herzberg, R. -D., Amzal, N., Becker, F., Butler, P. A., Chewter, A. J. C., Cocks, J. F. C., Dorvaux, O., Eeckhaudt, S., Eskola, K., Gerl, J., Grahn, T., Hammond, N. J., Hauschild, K., Helariutta, K., Heßberger, F. P., Houry, M., Jones, G. D., Jones, P. M., Julin, R., Juutinen, S., Kankaanpää, H., Kettunen, H., Khoo, T. L., Korten, W., Kuusiniemi, P., Le Coz, Y., Leino, M., Lister, C. J., Lucas, R., Muikku, M., Nieminen, P., Nyman, M., Page, R. D., Pakarinen, J., Rahkila, P., Reiter, P., Sarén, J., Schlegel, Ch., Scholey, C., Stezowski, O., Theisen, Ch., Trzaska, W. H., and Wollersheim, H. J.

Published
2006
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98. First candidates for γ vibrational bands built on the [505]11/2⁻ neutron orbital in odd-A Dy isotopes

Author

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

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.

Published
2020

99. Evidence for octupole collectivity in 172Pt

Author

Ertoprak, Aysegul, Cederwall, Bo, Qi, Chong, Aktas, Özge, Doncel, Maria, Hadinia, Baharak, Liotta, Roberto, Sandzelius, M., Scholey, C., Andgren, Karin, Bäck, Torbjörn, Badran, H., Braunroth, T., Calverley, T., Cox, D. M., Cullen, D. M., Fang, Y. D., Ganioglu, E., Giles, M., Gomez-Hornillos, M.B., Grahn, T., Greenlees, P. T., Hilton, J., Hodge, D., Ideguchi, E., Jakobsson, U., Johnson, Arne, Jones, P.M., Julin, R., Juutinen, S., Ketelhut, S., Khaplanov, Anton, Kumar Raju, M., Leino, M., Li, H., Liu, H., Matta, S., Modamio, V., Nara Singh, B. S., Niikura, M., Nyman, M., Özgur, I., Page, R. D., Pakarinen, J., Papadakis, P., Partanen, J., Paul, E. S., Petrache, C. M., Peura, P., Rahkila, P., Ruotsalainen, P., Saren, J., Sorri, J., Stolze, S., Subramaniam, P., Taylor, M. J., Uusitalo, J., Valiente-Dobon, J. J., Wyss, Ramon Alexander, Ertoprak, Aysegul, Cederwall, Bo, Qi, Chong, Aktas, Özge, Doncel, Maria, Hadinia, Baharak, Liotta, Roberto, Sandzelius, M., Scholey, C., Andgren, Karin, Bäck, Torbjörn, Badran, H., Braunroth, T., Calverley, T., Cox, D. M., Cullen, D. M., Fang, Y. D., Ganioglu, E., Giles, M., Gomez-Hornillos, M.B., Grahn, T., Greenlees, P. T., Hilton, J., Hodge, D., Ideguchi, E., Jakobsson, U., Johnson, Arne, Jones, P.M., Julin, R., Juutinen, S., Ketelhut, S., Khaplanov, Anton, Kumar Raju, M., Leino, M., Li, H., Liu, H., Matta, S., Modamio, V., Nara Singh, B. S., Niikura, M., Nyman, M., Özgur, I., Page, R. D., Pakarinen, J., Papadakis, P., Partanen, J., Paul, E. S., Petrache, C. M., Peura, P., Rahkila, P., Ruotsalainen, P., Saren, J., Sorri, J., Stolze, S., Subramaniam, P., Taylor, M. J., Uusitalo, J., Valiente-Dobon, J. J., and Wyss, Ramon Alexander

Abstract

Excited states in the extremely neutron-deficient nucleus 172Pt were populated via 96Ru(78Kr,2p) and 92Mo(83Kr,3n) reactions. The level scheme has been extended up to an excitation energy of ~ 5 MeV and tentative spin-parity assignments up to Iπ = 18+. Linear polarization and angular distribution measurements were used to determine the electromagnetic E1 character of the dipole transitions connecting the positive-parity ground-state band with an excited side-band, firmly establishing it as a negative-parity band. The lowest member of this negative-parity structure was firmly assigned spin-parity 3-. In addition, we observed an E3 transition from this 3- state to the ground state, providing direct evidence for octupole collectivity in 172Pt. Large-scale shell model (LSSM) and total Routhian surface (TRS) calculations have been performed, supporting the interpretation of the 3- state as a collective octupole-vibrational state., QC 20200427

Published
2020
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100. Multiple chiral bands in 137 Nd

Author

Petrache, C. M., Lv, B. F., Chen, Q. B., Meng, J., Astier, A., Dupont, E., Zheng, K. K., Greenlees, P. T., Badran, H., Calverley, T., Cox, D. M., Grahn, T., Hilton, J., Julin, R., Juutinen, S., Konki, J., Pakarinen, J., Papadakis, P., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Uusitalo, J., Cederwall, Bo, Ertoprak, Aysegül, Liu, Huan, Guo, S., Wang, J. G., Zhou, X. H., Kuti, I., Timár, J., Tucholski, A., Srebrny, J., Andreoiu, C., Petrache, C. M., Lv, B. F., Chen, Q. B., Meng, J., Astier, A., Dupont, E., Zheng, K. K., Greenlees, P. T., Badran, H., Calverley, T., Cox, D. M., Grahn, T., Hilton, J., Julin, R., Juutinen, S., Konki, J., Pakarinen, J., Papadakis, P., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Uusitalo, J., Cederwall, Bo, Ertoprak, Aysegül, Liu, Huan, Guo, S., Wang, J. G., Zhou, X. H., Kuti, I., Timár, J., Tucholski, A., Srebrny, J., and Andreoiu, C.

Abstract

Two new bands have been identified in 137Nd from a high-statistics JUROGAM II gamma-ray spectroscopy experiment. Constrained density functional theory and particle rotor model calculations are used to assign configurations and investigate the band properties, which are well described and understood. It is demonstrated that these two new bands can be interpreted as chiral partners of previously known three-quasiparticle positive- and negative-parity bands. The newly observed chiral doublet bands in 137Nd represent an important support to the existence of multiple chiral bands in nuclei. The present results constitute the missing stone in the series of Nd nuclei showing multiple chiral bands, which becomes the most extended sequence of odd–even and even-even nuclei presenting multiple chiral bands in the Segré chart., QC 20220614

Published
2020
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