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2. New collective structures in 179Au and their implications for the triaxial deformation of the 178Pt core

Author

Balogh, M., Jajčišinová, E., Venhart, M., Herzáň, A., Wood, J. L., Joss, D. T., Ali, F. A., Auranen, K., Bánovská, S., Bírová, M., Carroll, R. J., Cox D., M., Cubiss J., G., Davis, T., Drummond M., C., Greenlees, P. T., Grahn, T., Gredley, A., Henderson, J., Jakobsson, U., Julin, R., Juutinen, S., Kantay, G., Konki, J., Konopka, P., Leino, M., Matoušek, V., Mistry A., K., 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., Seweryniak, D., Scholey, C., Sorri, J., Špaček, A., Stolze, S., Taylor, M., Thornthwaite, A., Uusitalo, J., Veselský, M., Vielhauer, S., and Wearing, F. P.

Subjects
platina, isotoopit, ydinfysiikka, kulta
Abstract

The extremely neutron-deficient isotope 179Au has been studied by a combination of in-beam γ-ray and isomeric-decay spectroscopy. For in-beam spectroscopy, the recoil-isomer tagging technique was employed, using the known 3/2−, T1/2=328 ns isomer. A new rotational band, associated with the unfavored signature band of the 1h9/2⊕2f7/2 proton-intruder configuration, was revealed. A previously unknown, high-spin isomeric state with an excitation energy of 1743(17) keV and T1/2=2.16(8)µs was discovered. Five decay paths were identified, some of them feeding previously unknown non-yrast excited states, associated with the 1i13/2 proton-intruder configuration. Calculations based on the particle-plus-triaxial-rotor model were performed to interpret the data. On the basis of these calculations, the new 1h9/2⊕2f7/2 rotational band is interpreted as due to triaxial deformation of the underlying configuration with β2≈0.26 and γ≈27∘. Observed non-yrast states of the positive-parity 1i13/2 intruder configuration are interpreted as due to triaxial deformation with β2≈0.26 and γ≈20∘. peerReviewed

Published
2022

3. 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

4. Competition between Allowed and First-Forbidden $beta$ Decay: The Case of $^208Hgrightarrow^208Tl$

Author

Carroll, R. J., Podolyák, Zs., Berry, T., Grawe, H., Alexander, T., Andreyev, A. N., Ansari, S., Borge, M. J. G., Brunet, M., Creswell, J. R., Fraile, L. M., Fahlander, C., Fynbo, H. O. U., Gamba, E. R., Gelletly, W., Gerst, R.-B., Górska, M., Gredley, A., Greenlees, P. T., Harkness-Brennan, L. J., Huyse, M., Judge, S. M., Judson, D. S., Konki, J., Kurcewicz, J., Kuti, I., Lalkovski, S., Lazarus, I. H., Licifmmode ăelse ă, R., Lund, M., Madurga, M., Marginean, N., Marginean, R., Marroquin, I., Mihai, C., Mihai, R. E., Nácher, E., Negret, A., Nita, C., Pascu, S., Page, R. D., Patel, Z., Perea, A., Phrompao, J., Piersa, M., Pucknell, V., Rahkila, P., Rapisarda, E., Regan, P. H., Rotaru, F., Rudigier, M., Shand, C. M., Shearman, R., Stegemann, S., Stora, T., Sotty, Ch., Tengblad, O., Van Duppen, P., Vedia, V., Wadsworth, R., Walker, P. M., Warr, N., Wearing, F., and De Witte, H.

Published
2020

5. Competition between Allowed and First-Forbidden beta Decay : The Case of Hg-208 -> Tl-2(0)8

Author

Carroll, RJ, Podolyak, Zs, Berry, T, Grawe, H, Alexander, T, Andreyev, AN, Ansari, S, Borge, MJG, Brunet, M, Creswell, JR, Fraile, LM, Fahlander, C, Fynbo, HOU, Gamba, ER, Gelletly, W, Gerst, R-B, Gorska, M, Gredley, A, Greenlees, PT, Harkness-Brennan, LJ, Huyse, M, Judge, SM, Judson, DS, Konki, J, Kurcewicz, J, Kuti, I, Lalkovski, S, Lazarus, IH, Lica, R, Lund, M, Madurga, M, Marginean, N, Marginean, R, Marroquin, I, Mihai, C, Mihai, RE, Nacher, E, Negret, A, Nita, C, Pascu, S, Page, RD, Patel, Z, Perea, A, Phrompao, J, Piersa, M, Pucknell, V, Rahkila, P, Rapisarda, E, Regan, PH, Rotaru, F, Rudigier, M, Shand, CM, Shearman, R, Stegemann, S, Stora, T, Sotty, Ch, Tengblad, O, Van Duppen, P, Vedia, V, Wadsworth, R, Walker, PM, Warr, N, Wearing, F, De Witte, H, and Helsinki Institute of Physics

Subjects
Science & Technology, NUCLEAR-DATA SHEETS, Physics, Physical Sciences, Physics, Multidisciplinary, SELECTION RULE, Nuclear Theory, Nuclear Experiment, 114 Physical sciences
Abstract

The β decay of ^{208}Hg into the one-proton hole, one neutron-particle _{81}^{208}Tl_{127} nucleus was investigated at CERN-ISOLDE. Shell-model calculations describe well the level scheme deduced, validating the proton-neutron interactions used, with implications for the whole of the N>126, Z

Published
2020

6. Competition between Allowed and First-Forbidden β Decay: The Case of ^{208}Hg→^{208}Tl

Author

Carroll, R. J., Podolyák, Zs., Berry, T., Grawe, H., Alexander, T., Andreyev, A. N., Ansari, S., Borge, M. J. G., Brunet, M., Creswell, J. R., Fraile, L. M., Fahlander, C., Fynbo, H. O. U., Gamba, E. R., Gelletly, W., Gerst, R.-B., Górska, M., Gredley, A., Greenlees, P. T., Harkness-Brennan, L. J., Huyse, M., Judge, S. M., Judson, D. S., Konki, J., Kurcewicz, J., Kuti, I., Lalkovski, S., Lazarus, I. H., Lică, R., Lund, M., Madurga, M., Marginean, N., Marginean, R., Marroquin, I., Mihai, C., Mihai, R. E., Nácher, E., Negret, A., Nita, C., Pascu, S., Page, R. D., Patel, Z., Perea, A., Phrompao, J., Piersa, M., Pucknell, V., Rahkila, P., Rapisarda, E., Regan, P. H., Rotaru, F., Rudigier, M., Shand, C. M., Shearman, R., Stegemann, S., Stora, T., Sotty, Ch., Tengblad, O., Van Duppen, P., Vedia, V., Wadsworth, R., Walker, P. M., Warr, N., Wearing, F., and De Witte, H.

Subjects
Nuclear Theory, Nuclear Physics - Experiment, ddc:530, Nuclear Experiment
Abstract

Physical review letters 125(19), 192501 (2020). doi:10.1103/PhysRevLett.125.192501, Published by APS, College Park, Md.

Published
2020
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7. Octupole states in Tl-207 studied through beta decay

Author

Berry, T. A., Podolyak, Zs, Carroll, R. J., Lica, R., Brown, B. A., Grawe, H., Sotty, Ch, Timofeyuk, N. K., Alexander, T., Andreyev, A. N., Ansari, S., Borge, M. J. G., Brunet, M., Cresswell, J. R., Fahlander, C., Fraile, L. M., Fynbo, H. O. U., Gamba, E., Gelletly, W., Gerst, R-B, Gorska, M., Gredley, A., Greenlees, P., Harkness-Brennan, L. J., Huyse, M., Judge, S. M., Judson, D. S., Konki, J., Kowalska, M., Kurcewicz, J., Kuti, I., Lalkovski, S., Lazarus, I., Lund, M., Madurga, M., Marginean, N., Mihai, C., Mihai, R. E., Nacher, E., Negret, A., Nae, S., Nita, C., Pascu, S., Page, R. D., Patel, Z., Perea, A., Phrompao, J., Piersa, M., Pucknell, V., Rahkila, P., Rapisarda, E., Regan, P. H., Rotaru, F., Rudigier, M., Shand, C. M., Shearman, R., Simpson, E. C., Stegemann, S., Stora, T., Tengblad, O., Turturica, A., Van Duppen, P., Vedia, V., Walker, P. M., Warr, N., Wearing, F. P., De Witte, H., and Helsinki Institute of Physics

Subjects
114 Physical sciences
Abstract

The beta decay of Hg-207 into the single-proton-hole nucleus Tl-207 has been studied through gamma-ray spectroscopy at the ISOLDE Decay Station (IDS) with the aim of identifying states resulting from coupling of the pi s(1/2)(-1), pi d(3/2)(-1) and pi h(11/2)(-1) shell model orbitals to the collective octupole vibration. Twenty-two states were observed lying between 2.6 and 4.0 MeV, eleven of which were observed for the first time, and 78 new transitions were placed. Two octupole states (s(3/2)-coupled) are identified and three more states (d(3/2)-coupled) are tentatively assigned using spin-parity inferences, while further h(11/2)-coupled states may also have been observed for the first time. Comparisons are made with state-of-the-art large-scale shell model calculations and previous observations made in this region, and systematic underestimation of the energy of the octupole vibrational states is noted. We suggest that in order to resolve the difference in predicted energies for collective and noncollective t = 1 states (t is the number of nucleons breaking the Pb-208 core), the effect of t = 2 mixing may be reduced for octupole-coupled states. The inclusion of mixing with t = 0, 2, 3 excitations is necessary to replicate all t = 1 state energies accurately.

Published
2020

8. Octupole states in $^{207}TI$ studied through $\beta$ decay

Author

Berry, T. A., Podolyák, Zs., Carroll, R. J., Lică, R., Brown, B. A., Grawe, Hubert, Sotty, Ch., Timofeyuk, N. K., Alexander, T., Andreyev, A. N., Ansari, S., Borge, M. J. G., Brunet, M., Cresswell, J. R., Fahlander, C., Fraile, L. M., Fynbo, H. O. U., Gamba, E., Gelletly, W., Gerst, R.-B., Górska, M., Gredley, A., Greenlees, P., Harkness-Brennan, L. J., Huyse, M., Judge, S. M., Judson, D. S., Konki, J., Kowalska, M., Kurcewicz, J., Kuti, I., Lalkovski, S., Lazarus, I., Lund, M., Madurga, M., Mărginean, N., Mărginean, R., Marroquin, I., Mihai, C., Mihai, R. E., Nácher, E., Negret, A., Nae, S., Niţă, C., Pascu, S., Page, R. D., Patel, Z., Perea, A., Phrompao, J., Piersa, M., Pucknell, V., Rahkila, P., Rapisarda, E., Regan, P. H., Rotaru, F., Rudigier, M., Shand, C. M., Shearman, R., Simpson, E. C., Stegemann, S., Stora, T., Tengblad, O., Turturica, A., Van Duppen, P., Vedia, V., Walker, P. M., Warr, N., Wearing, F. P., and De Witte, H.

Subjects
ddc:530
Abstract

Physical review / C 101(5), 054311 (2020). doi:10.1103/PhysRevC.101.054311, Published by APS, Woodbury, NY

Published
2020
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9. Octupole states in 207Tl studied through β decay

Author

Berry, T A, Podolyák, Zs, Carroll, R J, Lică, R, Brown, B A, Grawe, H, Sotty, Ch, Timofeyuk, N K, Alexander, T, Andreyev, A N, Ansari, S, Borge, M J G, Brunet, M, Cresswell, J R, Fahlander, C, Fraile, L M, Fynbo, H O U, Gamba, E, Gelletly, W, Gerst, R B, Górska, M, Gredley, A, Greenlees, P, Harkness-Brennan, L J, Huyse, M, Judge, S M, Judson, D S, Konki, J, Kowalska, M, Kurcewicz, J, Kuti, I, Lalkovski, S, Lazarus, I, Lund, M, Madurga, M, Mărginean, N, Mărginean, R, Marroquin, I, Mihai, C, Mihai, R E, Nácher, E, Negret, A, Nae, S, Niţă, C, Pascu, S, Page, R D, Patel, Z, Perea, A, Phrompao, J, Piersa, M, Pucknell, V, Rahkila, P, Rapisarda, E, Regan, P H, Rotaru, F, Rudigier, M, Shand, C M, Shearman, R, Simpson, E C, Stegemann, S, Stora, T, Tengblad, O, Turturica, A, Van Duppen, P, Vedia, V, Walker, P M, Warr, N, Wearing, F P, and De Witte, H

Subjects
nucleon distribution, Nuclear Physics - Experiment, collective levels, beta decay, ydinfysiikka, nuclear structure and decays
Abstract

The β decay of 207Hg into the single-proton-hole nucleus 207Tl has been studied through γ-ray spectroscopy at the ISOLDE Decay Station (IDS) with the aim of identifying states resulting from coupling of the πs−11/2, πd−13/2, and πh−111/2 shell model orbitals to the collective octupole vibration. Twenty-two states were observed lying between 2.6 and 4.0 MeV, eleven of which were observed for the first time, and 78 new transitions were placed. Two octupole states (s1/2-coupled) are identified and three more states (d3/2-coupled) are tentatively assigned using spin-parity inferences, while further h11/2-coupled states may also have been observed for the first time. Comparisons are made with state-of-the-art large-scale shell model calculations and previous observations made in this region, and systematic underestimation of the energy of the octupole vibrational states is noted. We suggest that in order to resolve the difference in predicted energies for collective and noncollective t=1 states (t is the number of nucleons breaking the 208Pb core), the effect of t=2 mixing may be reduced for octupole-coupled states. The inclusion of mixing with t=0,2,3 excitations is necessary to replicate all t=1 state energies accurately.

Published
2020
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10. Competition between Allowed and First-Forbidden β Decay : The Case of Hg208→Tl208

Author

Carroll, R. J., Podolyák, Zs., Berry, T., Grawe, H., Alexander, T., Andreyev, A. N., Ansari, S., Borge, M. J. G., Brunet, M., Creswell, J. R., Fraile, L. M., Fahlander, C., Fynbo, H. O. U., Gamba, E. R., Gelletly, W., Gerst, R.-B., Górska, M., Gredley, A., Greenlees, P. T., Harkness-Brennan, L. J., Huyse, M., Judge, S. M., Judson, D. S., Konki, J., Kurcewicz, J., Kuti, I., Lalkovski, S., Lazarus, I. H., Lică, R., Lund, M., Madurga, M., Marginean, N., Marginean, R., Marroquin, I., Mihai, C., Mihai, R. E., Nácher, E., Negret, A., Nita, C., Pascu, S., Page, R. D., Patel, Z., Perea, A., Phrompao, J., Piersa, M., Pucknell, V., Rahkila, P., Rapisarda, E., Regan, P. H., Rotaru, F., Rudigier, M., Shand, C. M., Shearman, R., Stegemann, S., Stora, T., Sotty, Ch., Tengblad, O., Van Duppen, P., Vedia, V., Wadsworth, R., Walker, P. M., Warr, N., Wearing, F., and De Witte, H.

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

The β decay of 208Hg into the one-proton hole, one neutron-particle 20881Tl127 nucleus was investigated at CERN-ISOLDE. Shell-model calculations describe well the level scheme deduced, validating the proton-neutron interactions used, with implications for the whole of the N>126, Z

Published
2020

11. Competition between Allowed and First-Forbidden beta Decay: The Case of Hg-208 -> Tl-2(0)8

Author

Carroll, R. J., Podolyak, Zs, Berry, T., Grawe, H., Alexander, T., Andreyev, A. N., Ansari, S., Borge, M. J. G., Brunet, M., Creswell, J. R., Fraile, L. M., Fahlander, C., Fynbo, H. O. U., Gamba, E. R., Gelletly, W., Gerst, R-B, Gorska, M., Gredley, A., Greenlees, P. T., Harkness-Brennan, L. J., Huyse, M., Judge, S. M., Judson, D. S., Konki, J., Kurcewicz, J., Kuti, I, Lalkovski, S., Lazarus, I. H., Lica, R., Lund, M., Madurga, M., Marginean, N., Marginean, R., Marroquin, I, Mihai, C., Mihai, R. E., Nacher, E., Negret, A., Nita, C., Pascu, S., Page, R. D., Patel, Z., Perea, A., Phrompao, J., Piersa, M., Pucknell, V, Rahkila, P., Rapisarda, E., Regan, P. H., Rotaru, F., Rudigier, M., Shand, C. M., Shearman, R., Stegemann, S., Stora, T., Sotty, Ch, Tengblad, O., Van Duppen, P., Vedia, V., Wadsworth, R., Walker, P. M., Warr, N., Wearing, F., De Witte, H., Carroll, R. J., Podolyak, Zs, Berry, T., Grawe, H., Alexander, T., Andreyev, A. N., Ansari, S., Borge, M. J. G., Brunet, M., Creswell, J. R., Fraile, L. M., Fahlander, C., Fynbo, H. O. U., Gamba, E. R., Gelletly, W., Gerst, R-B, Gorska, M., Gredley, A., Greenlees, P. T., Harkness-Brennan, L. J., Huyse, M., Judge, S. M., Judson, D. S., Konki, J., Kurcewicz, J., Kuti, I, Lalkovski, S., Lazarus, I. H., Lica, R., Lund, M., Madurga, M., Marginean, N., Marginean, R., Marroquin, I, Mihai, C., Mihai, R. E., Nacher, E., Negret, A., Nita, C., Pascu, S., Page, R. D., Patel, Z., Perea, A., Phrompao, J., Piersa, M., Pucknell, V, Rahkila, P., Rapisarda, E., Regan, P. H., Rotaru, F., Rudigier, M., Shand, C. M., Shearman, R., Stegemann, S., Stora, T., Sotty, Ch, Tengblad, O., Van Duppen, P., Vedia, V., Wadsworth, R., Walker, P. M., Warr, N., Wearing, F., and De Witte, H.

Abstract

The beta decay of Hg-208 into the one-proton hole, one neutron-particle Tl-208(81)127 nucleus was investigated at CERN-ISOLDE. Shell-model calculations describe well the level scheme deduced, validating the proton-neutron interactions used, with implications for the whole of the N > 126, Z < 82 quadrant of neutron-rich nuclei. While both negative and positive parity states with spin 0 and 1 are expected within the Q(beta) window, only three negative parity states are populated directly in the beta decay. The data provide a unique test of the competition between allowed Gamow-Teller and Fermi, and first-forbidden beta decays, essential for the understanding of the nucleosynthesis of heavy nuclei in the rapid neutron capture process. Furthermore, the observation of the parity changing 0(+) -> 0(-)beta decay where the daughter state is core excited is unique, and can provide information on mesonic corrections of effective operators.

Published
2020

12. alpha-spectroscopy studies of the new nuclides Pt-165 and Hg-170

Author

Hilton, J, Uusitalo, J, Saren, J, Page, RD, Joss, DT, AlAqeel, MAM, Badran, H, Briscoe, AD, Calverley, T, Cox, DM, Grahn, T, Gredley, A, Greenlees, PT, Harding, R, Herzan, A, Higgins, IE, Julin, R, Juutinen, S, Konki, J, Labiche, M, Leino, M, Lewis, MC, Ojala, J, Pakarinen, J, Papadakis, P, Partanen, J, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Scholey, C, Sorri, J, Sottili, L, Stolze, S, and Wearing, F

Published
2019

13. Investigation of the Delta n=0 selection rule in Gamow-Teller transitions: The beta-decay of Hg-207

Author

Berry, TA, Podolyak, Zs, Carroll, RJ, Lica, R, Grawe, H, Timofeyuk, NK, Alexander, T, Andreyev, AN, Ansari, S, Borge, MJG, Creswell, J, Fahlander, C, Fraile, LM, Fynbo, HOU, Gelletly, W, Gerst, R-B, Gorska, M, Gredley, A, Greenlees, R, Harkness-Brennan, LJ, Huyse, M, Judge, SM, Judson, DS, Konki, J, Kurcewicz, J, Kuti, I, Lalkovski, S, Lazarus, I, Lund, M, Madurga, M, Marginean, N, Marginean, R, Marroquin, I, Mihai, C, Mihai, RE, Nacher, E, Nae, S, Negret, A, Nita, C, Page, RD, Pascu, S, Patel, Z, Perea, A, Pucknell, V, Rahkila, R, Rapisarda, E, Regan, PH, Rotaru, F, Shand, CM, Simpson, EC, Sotty, Ch, Stegemann, S, Stora, T, Tengblad, O, Turturicag, A, Van Duppen, R, Vedia, V, Wadsworth, R, Walker, PM, Warr, N, Wearing, F, and De Witte, H

Published
2019

14. Investigation of the Δn = 0 selection rule in Gamow-Teller transitions : The β-decay of 207 Hg

Author

Berry, T. A., Podolyák, Zs, Carroll, R. J., Lică, R., Grawe, H., Timofeyuk, N. K., Alexander, T., Andreyev, A. N., Ansari, S., Borge, M. J.G., Creswell, J., Fahlander, C., Fraile, L. M., Fynbo, H. O.U., Gelletly, W., Gerst, R. B., Górska, M., Gredley, A., Greenlees, P., Harkness-Brennan, L. J., Huyse, M., Judge, S. M., Judson, D. S., Konki, J., Kurcewicz, J., Kuti, I., Lalkovski, S., Lazarus, I., Lund, M., Madurga, M., Mărginean, N., Mărginean, R., Marroquin, I., Mihai, C., Mihai, R. E., Nácher, E., Nae, S., Negret, A., Niţă, C., Page, R. D., Pascu, S., Patel, Z., Perea, A., Pucknell, V., Rahkila, P., Rapisarda, E., Regan, P. H., Rotaru, F., Shand, C. M., Simpson, E. C., Sotty, Ch, Stegemann, S., Stora, T., Tengblad, O., Turturica, A., Van Duppen, P., Vedia, V., Wadsworth, R., Walker, P. M., Warr, N., Wearing, F., and De Witte, H.

Abstract

Gamow-Teller β decay is forbidden if the number of nodes in the radial wave functions of the initial and final states is different. This Δn=0 requirement plays a major role in the β decay of heavy neutron-rich nuclei, affecting the nucleosynthesis through the increased half-lives of nuclei on the astrophysical r-process pathway below both Z=50 (for N>82) and Z=82 (for N>126). The level of forbiddenness of the Δn=1ν1g 9/2 →π0g 7/2 transition has been investigated from the β − decay of the ground state of 207 Hg into the single-proton-hole nucleus 207 Tl in an experiment at the ISOLDE Decay Station. From statistical observational limits on possible γ-ray transitions depopulating the π0g 7/2 −1 state in 207 Tl, an upper limit of 3.9×10 −3 % was obtained for the probability of this decay, corresponding to log⁡ft>8.8 within a 95% confidence limit. This is the most stringent test of the Δn=0 selection rule to date.

Published
2019

15. α-spectroscopy studies of the new nuclides 165Pt and 170Hg

Author

Hilton, J., Uusitalo, J., Sarén, J., Page, R. D., Joss, D. T., AlAqeel, M. A. M., Badran, H., Briscoe, A. D., Calverley, T., Cox, D. M., Grahn, T., Gredley, A., Greenlees, P. T., Harding, R., Herzan, A., Higgins, E., Julin, R., Juutinen, S., Konki, J., Labiche, M., Leino, M., Lewis, M. C., Ojala, J., Pakarinen, J., Papadakis, P., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Scholey, C., Sorri, J., Sottili, L., Stolze, S., and Wearing, F.

Subjects
alpha decay, transfer reactions, ydinfysiikka, nuclear structure and decays
Abstract

The new nuclides 165Pt and 170Hg were produced in the reactions 92Mo(78Kr,5n) and 96Ru(78Kr,4n) at bombarding energies of 418 MeV and 390 MeV, respectively. For 170Hg an α-particle energy of Eα=7590(30)keV and half-life of t1/2=0.08+0.40−0.04ms were deduced, while for 165Pt the corresponding values were 7272(14) keV and 0.26+0.26−0.09ms. Comparison of the reduced α-decay widths with systematics indicates that both α decays are unhindered. Although combining the measured α-decay Q values with extrapolated masses suggests that both new nuclides are unbound to two-proton emission by more than 1 MeV, their α-decay half-lives are too short for this decay mode to compete. Improved data were also obtained for 166,167Pt, produced via the 96Ru(78Kr,α4n) and 96Ru(78Kr,α3n) reactions at bombarding energies of 390 MeV and 418 MeV. peerReviewed

Published
2019

16. Investigation of the Δn = 0 selection rule in Gamow-Teller transitions : The β-decay of 207Hg

Author

Berry, T. A., Podolyák, Zs., Carroll, R. J., Lică, R., Grawe, H., Timofeyuk, N. K., Alexander, T., Andreyev, A. N., Ansari, S., Borge, M. J. G., Creswell, J., Fynbo, H. O. U., Gelletly, W., Gerst, R.-B., Górska, M., Gredley, A., Greenlees, Paul, Harkness-Brennan, L. J., Huyse, M., Judge, S. M., Judson, D. S., Konki, Joonas, Kurcewicz, J., Kuti, I., Lalkovski, S., Lazarus, I., Lund, M., Madurga, M., Mărginean, N., Mărginean, R., Marroquin, I., Mihai, C., Mihai, R. E., Nácher, E., Nae, S., Negret, A., Niţă, C., Pascu, S., Page, R. D., Patel, Z., Perea, A., Pucknell, V., Rahkila, Panu, Rapisarda, E., Regan, P. H., Rotaru, F., Shand, C. M., Simpson, E. C., Sotty, Ch., Stegemann, S., Stora, T., Tengblad, O., Turturica, A., Van Duppen, P., Vedia, V., Wadsworth, R., Walker, P. M., Warr, N., Wearing, F., and De Witte, H.

Subjects
Gamow-Teller transitions, ydinfysiikka
Abstract

Gamow-Teller β decay is forbidden if the number of nodes in the radial wave functions of the initial and final states is different. This Δn = 0 requirement plays a major role in the β decay of heavy neutron-rich nuclei, affecting the nucleosynthesis through the increased half-lives of nuclei on the astrophysical r-process pathway below both Z = 50 (for N > 82) and Z = 82 (for N >126). The level of forbiddenness of the Δn = 1ν1g9/2 → π0g7/2 transition has been investigated from the β− decay of the ground state of 207Hg into the single-proton-hole nucleus 207Tl in an experiment at the ISOLDE Decay Station. From statistical observational limits on possible γ-ray transitions depopulating the π0g7/2−1 state in 207Tl, an upper limit of 3.9 × 10−3% was obtained for the probability of this decay, corresponding to log ft > 8.8 within a 95% confidence limit. This is the most stringent test of the Δn = 0 selection rule to date. peerReviewed

Published
2019

17. α-spectroscopy studies of the new nuclides ¹⁶⁵Pt and ¹⁷⁰Hg

Author

Hilton, J. (J.), Uusitalo, J. (J.), Saren, J. (J.), Page, R. D. (R. D.), Joss, D. T. (D. T.), AlAqeel, M. A. (M. A. M.), Badran, H. (H.), Briscoe, A. D. (A. D.), Calverley, T. (T.), Cox, D. M. (D. M.), Grahn, T. (T.), Gredley, A. (A.), Greenlees, P. T. (P. T.), Harding, R. (R.), Herzan, A. (A.), Higgins, I. E. (I. E.), Julin, R. (R.), Juutinen, S. (S.), Konki, J. (J.), Labiche, M. (M.), Leino, M. (M.), Lewis, M. C. (M. C.), Ojala, J. (J.), Pakarinen, J. (J.), Papadakis, P. (P.), Partanen, J. (J.), Rahkila, P. (P.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Scholey, C. (C.), Sorri, J. (J.), Sottili, L. (L.), Stolze, S. (S.), and Wearing, F. (F.)

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

The new nuclides \(^{165}\mathrm{Pt}\) and \(^{170}\mathrm{Hg}\) were produced in the reactions \(^{92}\mathrm{Mo}(^{78}\mathrm{Kr},5n)\) and \(^{96}\mathrm{Ru}(^{78}\mathrm{Kr},4n)\) at bombarding energies of 418 MeV and 390 MeV, respectively. For \(^{170}\mathrm{Hg}\) an α-particle energy of \(E_{α} = 7590(30)\) keV and half-life of \(t_{1/2} = 0.08^{+0.40}_{−0.04}\)ms were deduced, while for \(^{165}\mathrm{Pt}\) the corresponding values were 7272(14) keV and \(0.26^{+0.26}_{−0.09}\)ms. Comparison of the reduced α-decay widths with systematics indicates that both α decays are unhindered. Although combining the measured α-decay Q values with extrapolated masses suggests that both new nuclides are unbound to two-proton emission by more than 1 MeV, their α-decay half-lives are too short for this decay mode to compete. Improved data were also obtained for \(^{166,167}\mathrm{Pt}\), produced via the \(^{96}\mathrm{Ru}(^{78}\mathrm{Kr},α4n)\) and \(^{96}\mathrm{Ru}(^{78}\mathrm{Kr},α3n)\) reactions at bombarding energies of 390 MeV and 418 MeV.

Published
2019

18. Investigation of the Delta n=0 selection rule in Gamow-Teller transitions: The beta-decay of Hg-207

Author

Berry, T. A., Podolyak, Zs, Carroll, R. J., Lica, R., Grawe, H., Timofeyuk, N. K., Alexander, T., Andreyev, A. N., Ansari, S., Borge, M. J. G., Creswell, J., Fahlander, C., Fraile, L. M., Fynbo, H. O. U., Gelletly, W., Gerst, R-b, Gorska, M., Gredley, A., Greenlees, R., Harkness-Brennan, L. J., Huyse, M., Judge, S. M., Judson, D. S., Konki, J., Kurcewicz, J., Kuti, I, Lalkovski, S., Lazarus, I, Lund, M., Madurga, M., Marginean, N., Marginean, R., Marroquin, I, Mihai, C., Mihai, R. E., Nacher, E., Nae, S., Negret, A., Nita, C., Page, R. D., Pascu, S., Patel, Z., Perea, A., Pucknell, V, Rahkila, R., Rapisarda, E., Regan, P. H., Rotaru, F., Shand, C. M., Simpson, E. C., Sotty, Ch, Stegemann, S., Stora, T., Tengblad, O., Turturicag, A., Van Duppen, R., Vedia, V., Wadsworth, R., Walker, P. M., Warr, N., Wearing, F., De Witte, H., Berry, T. A., Podolyak, Zs, Carroll, R. J., Lica, R., Grawe, H., Timofeyuk, N. K., Alexander, T., Andreyev, A. N., Ansari, S., Borge, M. J. G., Creswell, J., Fahlander, C., Fraile, L. M., Fynbo, H. O. U., Gelletly, W., Gerst, R-b, Gorska, M., Gredley, A., Greenlees, R., Harkness-Brennan, L. J., Huyse, M., Judge, S. M., Judson, D. S., Konki, J., Kurcewicz, J., Kuti, I, Lalkovski, S., Lazarus, I, Lund, M., Madurga, M., Marginean, N., Marginean, R., Marroquin, I, Mihai, C., Mihai, R. E., Nacher, E., Nae, S., Negret, A., Nita, C., Page, R. D., Pascu, S., Patel, Z., Perea, A., Pucknell, V, Rahkila, R., Rapisarda, E., Regan, P. H., Rotaru, F., Shand, C. M., Simpson, E. C., Sotty, Ch, Stegemann, S., Stora, T., Tengblad, O., Turturicag, A., Van Duppen, R., Vedia, V., Wadsworth, R., Walker, P. M., Warr, N., Wearing, F., and De Witte, H.

Abstract

Gamow-Teller beta decay is forbidden if the number of nodes in the radial wave functions of the initial and final states is different. This Delta n = 0 requirement plays a major role in the beta decay of heavy neutron-rich nuclei, affecting the nucleosynthesis through the increased half-lives of nuclei on the astrophysical r-process pathway below both Z = 50 (for N > 82) and Z = 82 (for N > 126). The level of forbiddenness of the Delta n = 1 nu 1g(9/2) -> pi 0g(7/2) transition has been investigated from the beta(-) decay of the ground state of Hg-207 into the single-proton-hole nucleus Tl-207 in an experiment at the ISOLDE Decay Station. From statistical observational limits on possible gamma-ray transitions depopulating the pi 0g(7/2)(-1) state in Tl-207, an upper limit of 3.9 x 10(-3)% was obtained for the probability of this decay, corresponding to log ft > 8.8 within within a 95% confidence limit. This is the most stringent test of the Delta n = 0 selection rule to date. (C) 2019 The Authors. Published by Elsevier B.V.

Published
2019

19. Change in structure between the = 1/2 States in Tl and Au

Author

Cubiss, J.G., Barzakh, A.E., Andreyev, A.N., Al Monthery, M., Althubiti, N., Andel, B., Antalic, S., Atanasov, D., Blaum, K., Cocolios, T.E., Day Goodacre, T., de Groote, R.P., de Roubin, A., Farooq-Smith, G.J., Fedorov, D.V., Fedosseev, V.N., Ferrer, R., Fink, D.A., Gaffney, L.P., Ghys, L., Gredley, A., Harding, R.D., Herfurth, F., Huyse, M., Imai, N., Joss, D.T., Köster, U., Kreim, S., Liberati, V., Lunney, D., Lynch, K.M., Manea, V., Marsh, B.A., Martinez Palenzuela, Y., Molkanov, P.L., Mosat, P., Neidherr, D., O'Neill, G.G., Page, R.D., Procter, T.J., Rapisarda, E., Rosenbusch, M., Rothe, S., Sandhu, K., Schweikhard, L., Seliverstov, M.D., Sels, S., Spagnoletti, P., Truesdale, V.L., Van Beveren, C., Van Duppen, P., Veinhard, M., Venhart, M., Veselský, M., Wearing, F., Welker, A., Wienholtz, F., Wolf, R.N., Zemlyanoy, S.G., and Zuber, K.

Abstract

The first accurate measurements of the α-decay branching ratio and half-life of the Iπ=1/2+ ground state in $^{181}$Tl have been made, along with the first determination of the magnetic moments and I=1/2 spin assignments of the ground states in $^{177,179}$Au. The results are discussed within the complementary systematics of the reduced α-decay widths and nuclear g factors of low-lying, Iπ=1/2+ states in the neutron-deficient lead region. The findings shed light on the unexpected hindrance of the 1/2+→1/2+, $^{181}$Tl→g177Au$^{g}$ α decay, which is explained by a mixing of π3s1/2 and π2d3/2 configurations in $^{177}$Au$^{g}$, whilst $^{181}$Tl$^{g}$ remains a near-pure π3s1/2. This conclusion is inferred from the g factor of $^{177}$Au$^{g}$ which has an intermediate value between those of π3s1/2 and π2d3/2 states. A similar mixed configuration is proposed for the Iπ=1/2+ ground state of $^{179}$Au. This mixing may provide evidence for triaxial shapes in the ground states in these nuclei.

Published
2018

20. Change in structure between the I = 1/2 states in 181Tl and 177,179Au

Author

Cubiss, J.G., primary, Barzakh, A.E., additional, Andreyev, A.N., additional, Al Monthery, M., additional, Althubiti, N., additional, Andel, B., additional, Antalic, S., additional, Atanasov, D., additional, Blaum, K., additional, Cocolios, T.E., additional, Day Goodacre, T., additional, de Groote, R.P., additional, de Roubin, A., additional, Farooq-Smith, G.J., additional, Fedorov, D.V., additional, Fedosseev, V.N., additional, Ferrer, R., additional, Fink, D.A., additional, Gaffney, L.P., additional, Ghys, L., additional, Gredley, A., additional, Harding, R.D., additional, Herfurth, F., additional, Huyse, M., additional, Imai, N., additional, Joss, D.T., additional, Köster, U., additional, Kreim, S., additional, Liberati, V., additional, Lunney, D., additional, Lynch, K.M., additional, Manea, V., additional, Marsh, B.A., additional, Martinez Palenzuela, Y., additional, Molkanov, P.L., additional, Mosat, P., additional, Neidherr, D., additional, O'Neill, G.G., additional, Page, R.D., additional, Procter, T.J., additional, Rapisarda, E., additional, Rosenbusch, M., additional, Rothe, S., additional, Sandhu, K., additional, Schweikhard, L., additional, Seliverstov, M.D., additional, Sels, S., additional, Spagnoletti, P., additional, Truesdale, V.L., additional, Van Beveren, C., additional, Van Duppen, P., additional, Veinhard, M., additional, Venhart, M., additional, Veselský, M., additional, Wearing, F., additional, Welker, A., additional, Wienholtz, F., additional, Wolf, R.N., additional, Zemlyanoy, S.G., additional, and Zuber, K., additional

Published
2018
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21. Spectroscopy of Hf-161 from low to high spin

Author

Mason, PJR, Simpson, J, Paul, ES, Riley, MA, Auranen, K, Badran, H, Baron, JS, Boston, AJ, Davis-Merry, T, Grahn, T, Greenlees, PT, Herzan, A, Jakobsson, U, Joss, DT, Julin, R, Juutinen, S, Konki, J, Leino, M, McPeake, C, Miller, SL, O'Neill, G, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Saren, J, Scholey, C, Sharpey-Schafer, JF, Sinclair, L, Sorri, J, Stolze, S, Uusitalo, J, Villafani, K, Wearing, F, and Wright, JP

Published
2014

22. Spectroscopy of 161Hf from low to high spin

Author

Mason, P. J. R., Simpson, J., Paul, E. S., Riley, M. A., Auranen, Kalle, Badran, Hussam, Baron, J. S., Boston, A. J., Davis-Merry, T., Grahn, Tuomas, Greenlees, Paul, Herzan, Andrej, Jakobsson, Ulrika, Joss, D. T., Julin, Rauno, Juutinen, Sakari, Konki, Joonas, Leino, Matti, McPeake, C., Miller, S. L., O'Neill, G., Pakarinen, Janne, Papadakis, Philippos, Partanen, Jari, Peura, Pauli, Rahkila, Panu, Ruotsalainen, Panu, Sandzelius, Mikael, Sarén, Jan, Scholey, Catherine, Sharpey-Schafer, J. F., Sinclair, L., Sorri, Juha, Stolze, Sanna, Uusitalo, Juha, Villafani, K., Wearing, F., and Wrigh, J. P.

Subjects
spektroskopia, neutron-deficient nuclei
Abstract

Excited states in the neutron-deficient nucleus 161 72Hf89 have been populated using the 118Sn(48Ti,5n) 161Hf and 110Pd(56Fe,5n) 161Hf fusion-evaporation reactions at 240 and 270 MeV, respectively. The level scheme for 161Hf has been extended with the observation of new band structures and an I π = (13/2+) isomeric state with a half-life of 4.8(2) μs has been identified. The decay path from this isomer to the (7/2−) ground state is established. The yrast band, based on the (13/2+) isomeric state, is extended up to (73/2+) and side band structures are identified up to (69/2−) and (55/2−). Quasiparticle assignments for these rotational structures are made on the basis of their alignment properties and Woods-Saxon cranked shell-model calculations. peerReviewed

Published
2014

23. Competition between Allowed and First-Forbidden β Decay: The Case of Hg 208 → Tl 208

Author

Carroll, R. J., Podolyák, Zs., Berry, T., Grawe, H., Alexander, T., Andreyev, A. N., Ansari, S., Borge, M. J. G., Brunet, M., Creswell, J. R., Fraile, L. M., Fahlander, C., Fynbo, H. O. U., Gamba, E. R., Gelletly, W., Gerst, R.-B., Górska, M., Gredley, A., Greenlees, P. T., Harkness-Brennan, L. J., Huyse, M., Judge, S. M., Judson, D. S., Konki, J., Kurcewicz, J., Kuti, I., Lalkovski, S., Lazarus, I. H., Lică, R., Lund, M., Madurga, M., Marginean, N., Marginean, R., Marroquin, I., Mihai, C., Mihai, R. E., Nácher, E., Negret, A., Nita, C., Pascu, S., Page, R. D., Patel, Z., Perea, A., Phrompao, J., Piersa, M., Pucknell, V., Rahkila, P., Rapisarda, E., Regan, P. H., Rotaru, F., Rudigier, M., Shand, C. M., Shearman, R., Stegemann, S., Stora, T., Sotty, Ch., Tengblad, O., Van Duppen, P., Vedia, V., Wadsworth, R., Walker, P. M., Warr, N., Wearing, F., and De Witte, H.

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24. Octupole states in Tl 207 studied through β decay

Author

Berry, T. A., Podolyák, Zs, Carroll, R. J., Licǎ, R., Brown, B. A., Grawe, H., Sotty, Ch, Timofeyuk, N. K., Alexander, T., Andreyev, A. N., Ansari, S., Borge, M. J.G., Brunet, M., Cresswell, J. R., Fahlander, C., Fraile, L. M., Fynbo, H. O.U., Gamba, E., Gelletly, W., Gerst, R. B., Górska, M., Gredley, A., Greenlees, P., Harkness-Brennan, L. J., Huyse, M., Judge, S. M., Judson, D. S., Konki, J., Kowalska, M., Kurcewicz, J., Kuti, I., Lalkovski, S., Lazarus, I., Lund, M., Madurga, M., Mǎrginean, N., Mǎrginean, R., Marroquin, I., Mihai, C., Mihai, R. E., Nácher, E., Negret, A., Nae, S., Niţǎ, C., Pascu, S., Page, R. D., Patel, Z., Perea, A., Phrompao, J., Piersa, M., Pucknell, V., Rahkila, P., Rapisarda, E., Regan, P. H., Rotaru, F., Rudigier, M., Shand, C. M., Shearman, R., Simpson, E. C., Stegemann, S., Stora, T., Tengblad, O., Turturica, A., Van Duppen, P., Vedia, V., Walker, P. M., Warr, N., Wearing, F. P., and De Witte, H.

Abstract

The β decay of Hg207 into the single-proton-hole nucleus Tl207 has been studied through γ-ray spectroscopy at the ISOLDE Decay Station (IDS) with the aim of identifying states resulting from coupling of the πs1/2-1, πd3/2-1, and πh11/2-1 shell model orbitals to the collective octupole vibration. Twenty-two states were observed lying between 2.6 and 4.0 MeV, eleven of which were observed for the first time, and 78 new transitions were placed. Two octupole states (s1/2-coupled) are identified and three more states (d3/2-coupled) are tentatively assigned using spin-parity inferences, while further h11/2-coupled states may also have been observed for the first time. Comparisons are made with state-of-the-art large-scale shell model calculations and previous observations made in this region, and systematic underestimation of the energy of the octupole vibrational states is noted. We suggest that in order to resolve the difference in predicted energies for collective and noncollective t=1 states (t is the number of nucleons breaking the Pb208 core), the effect of t=2 mixing may be reduced for octupole-coupled states. The inclusion of mixing with t=0,2,3 excitations is necessary to replicate all t=1 state energies accurately.

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