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1. Coulomb excitation of Rn-222

Author

Spagnoletti, P., Butler, P. A., Gaffney, L. P., Abrahams, K., Bowry, M., Cederkall, J., Chupp, T., de Angelis, G., De Witte, H., Garrett, P. E., Goldkuhle, A., Henrich, C., Illana, A., Johnston, K., Joss, D. T., Keatings, J. M., Kelly, N. A., Komorowska, M., Konki, J., Kroll, T., Lozano, M., Singh, B. S. Nara, O'Donnell, D., Ojala, J., Page, R. D., Pedersen, L. G., Raison, C., Reiter, P., Rodriguez, J. A., Rosiak, D., Rothe, S., Scheck, M., Seidlitz, M., Shneidman, T. M., Siebeck, B., Sinclair, J., Smith, J. F., Stryjczyk, M., Van Duppen, P., Vinals, S., Virtanen, V., Wrzosek-Lipska, K., Warr, N., Zielinska, M., Spagnoletti, P., Butler, P. A., Gaffney, L. P., Abrahams, K., Bowry, M., Cederkall, J., Chupp, T., de Angelis, G., De Witte, H., Garrett, P. E., Goldkuhle, A., Henrich, C., Illana, A., Johnston, K., Joss, D. T., Keatings, J. M., Kelly, N. A., Komorowska, M., Konki, J., Kroll, T., Lozano, M., Singh, B. S. Nara, O'Donnell, D., Ojala, J., Page, R. D., Pedersen, L. G., Raison, C., Reiter, P., Rodriguez, J. A., Rosiak, D., Rothe, S., Scheck, M., Seidlitz, M., Shneidman, T. M., Siebeck, B., Sinclair, J., Smith, J. F., Stryjczyk, M., Van Duppen, P., Vinals, S., Virtanen, V., Wrzosek-Lipska, K., Warr, N., and Zielinska, M.

Abstract

The nature of quadrupole and octupole collectivity in 222Rn was investigated by determining the electricquadrupole (E2) and octupole (E3) matrix elements using subbarrier, multistep Coulomb excitation. The radioactive 222Rn beam, accelerated to 4.23 MeV/u, was provided by the HIE-ISOLDE facility at CERN. Data were collected in the Miniball gamma -ray spectrometer following the bombardment of two targets, 120Sn and 60Ni. Transition E2 matrix elements within the ground-state and octupole bands were measured up to 10 h over bar and the results were consistent with a constant intrinsic electric-quadrupole moment, 518(11) e fm2. The values of the intrinsic electric-octupole moment for the 0+ -> 3- and 2+ -> 5- transitions were found to be respectively -210 e fm3 and 2300+300-500 e fm3 while a smaller value, 1200+500-900 e fm3, was found for the 2+ -> 1- transition. In addition, four excited non-yrast states were identified in this work via gamma -gamma coincidences.

Published
2022

2. First beta-decay spectroscopy of In-135 and new beta-decay branches of In-134

Author

Piersa-Silkowska, M., Korgul, A., Benito, J., Fraile, L. M., Adamska, E., Andreyev, A. N., Alvarez-Rodriguez, R., Barzakh, A. E., Benzoni, G., Berry, T., Borge, M. J. G., Carmona, M., Chrysalidis, K., Correia, J. G., Costache, C., Cubiss, J. G., Goodacre, T. Day, De Witte, H., Fedorov, D., V, Fedosseev, V. N., Fernandez-Martinez, G., Fijalkowska, A., Fynbo, H., Galaviz, D., Galve, P., Garcia-Diez, M., Greenlees, P. T., Grzywacz, R., Harkness-Brennan, L. J., Henrich, C., Huyse, M., Ibanez, P., Illana, A., Janas, Z., Johnston, K., Jolie, J., Judson, D. S., Karanyonchev, V, Kicinska-Habior, M., Konki, J., Koszuk, L., Kurcewicz, J., Lazarus, I, Lica, R., Lopez-Montes, A., Mach, H., Madurga, M., Marroquin, I, Marsh, B., Martinez, M. C., Mazzocchi, C., Miernik, K., Mihai, C., Marginean, N., Marginean, R., Negret, A., Nacher, E., Ojala, J., Olaizola, B., Page, R. D., Pakarinen, J., Pascu, S., Paulauskas, S., V, Perea, A., Pucknell, V, Rahkila, P., Raison, C., Rapisarda, E., Rezynkina, K., Rotaru, F., Rothe, S., Rykaczewski, K. P., Regis, J-M, Schomacker, K., Silkowski, M., Simpson, G., Sotty, C., Stan, L., Stanoiu, M., Stryjczyk, M., Sanchez-Parcerisa, D., Sanchez-Tembleque, V, Tengblad, O., Turturica, A., Udias, J. M., Van Duppen, P., Vedia, V., Villa, A., Vinals, S., Wadsworth, R., Walters, W. B., Warr, N., Wilkins, S. G., Piersa-Silkowska, M., Korgul, A., Benito, J., Fraile, L. M., Adamska, E., Andreyev, A. N., Alvarez-Rodriguez, R., Barzakh, A. E., Benzoni, G., Berry, T., Borge, M. J. G., Carmona, M., Chrysalidis, K., Correia, J. G., Costache, C., Cubiss, J. G., Goodacre, T. Day, De Witte, H., Fedorov, D., V, Fedosseev, V. N., Fernandez-Martinez, G., Fijalkowska, A., Fynbo, H., Galaviz, D., Galve, P., Garcia-Diez, M., Greenlees, P. T., Grzywacz, R., Harkness-Brennan, L. J., Henrich, C., Huyse, M., Ibanez, P., Illana, A., Janas, Z., Johnston, K., Jolie, J., Judson, D. S., Karanyonchev, V, Kicinska-Habior, M., Konki, J., Koszuk, L., Kurcewicz, J., Lazarus, I, Lica, R., Lopez-Montes, A., Mach, H., Madurga, M., Marroquin, I, Marsh, B., Martinez, M. C., Mazzocchi, C., Miernik, K., Mihai, C., Marginean, N., Marginean, R., Negret, A., Nacher, E., Ojala, J., Olaizola, B., Page, R. D., Pakarinen, J., Pascu, S., Paulauskas, S., V, Perea, A., Pucknell, V, Rahkila, P., Raison, C., Rapisarda, E., Rezynkina, K., Rotaru, F., Rothe, S., Rykaczewski, K. P., Regis, J-M, Schomacker, K., Silkowski, M., Simpson, G., Sotty, C., Stan, L., Stanoiu, M., Stryjczyk, M., Sanchez-Parcerisa, D., Sanchez-Tembleque, V, Tengblad, O., Turturica, A., Udias, J. M., Van Duppen, P., Vedia, V., Villa, A., Vinals, S., Wadsworth, R., Walters, W. B., Warr, N., and Wilkins, S. G.

Abstract

The beta decay of the neutron-rich In-134 and In-135 was investigated experimentally in order to provide new insights into the nuclear structure of the tin isotopes with magic proton number Z = 50 above the N = 82 shell. The beta-delayed gamma-ray spectroscopy measurement was performed at the ISOLDE facility at CERN, where indium isotopes were selectively laser-ionized and on-line mass separated. Three beta-decay branches of In-134 were established, two of which were observed for the first time. Population of neutron-unbound states decaying via. rays was identified in the two daughter nuclei of In-134, Sn-134 and Sn-133, at excitation energies exceeding the neutron separation energy by 1 MeV. The beta-delayed one- and two-neutron emission branching ratios of In-134 were determined and compared with theoretical calculations. The beta-delayed one-neutron decay was observed to be dominant beta-decay branch of In-134 even though the Gamow-Teller resonance is located substantially above the two-neutron separation energy of Sn-134. Transitions following the beta decay of In-135 are reported for the first time, including. rays tentatively attributed to Sn-135. In total, six new levels were identified in Sn-134 on the basis of the beta.. coincidences observed in the In-134 and In-135 beta decays. A transition that might be a candidate for deexciting the missing neutron single-particle 13/2(+) state in Sn-133 was observed in both beta decays and its assignment is discussed. Experimental level schemes of Sn-134 and Sn-135 are compared with shell-model predictions. Using the fast timing technique, half-lives of the 2(+), 4(+), and 6(+) levels in Sn-134 were determined. From the lifetime of the 4(+) state measured for the first time, an unexpectedly large B(E2; 4(+)-> 2(+)) transition strength was deduced, which is not reproduced by the shell-model calculations.

Published
2021

3. New beta-decaying state in Bi-214

Author

Andel, B., Van Duppen, P., Andreyev, A. N., Blazhev, A., Grawe, H., Lica, R., Naidja, H., Stryjczyk, M., Algora, A., Antalic, S., Barzakh, A., Benito, J., Benzoni, G., Berry, T., Borge, M. J. G., Chrysalidis, K., Clisu, C., Costache, C., Cubiss, J. G., De Witte, H., Fedorov, D., V, Fedosseev, V. N., Fraile, L. M., Fynbo, H. O. U., Greenlees, P. T., Harkness-Brennan, L. J., Huyse, M., Illana, A., Jolie, J., Judson, D. S., Konki, J., Lazarus, I, Madurga, M., Marginean, N., Marginean, R., Mihai, C., Marsh, B. A., Molkanov, P., Mosat, P., Murias, J. R., Nacher, E., Negret, A., Page, R. D., Pascu, S., Perea, A., Pucknell, V, Rahkila, P., Rapisarda, E., Rezynkina, K., Sanchez-Tembleque, V, Schomacker, K., Seliverstov, M. D., Sotty, C., Stan, L., Surder, C., Tengblad, O., Vedia, V., Vinals, S., Wadsworth, R., Warr, N., Andel, B., Van Duppen, P., Andreyev, A. N., Blazhev, A., Grawe, H., Lica, R., Naidja, H., Stryjczyk, M., Algora, A., Antalic, S., Barzakh, A., Benito, J., Benzoni, G., Berry, T., Borge, M. J. G., Chrysalidis, K., Clisu, C., Costache, C., Cubiss, J. G., De Witte, H., Fedorov, D., V, Fedosseev, V. N., Fraile, L. M., Fynbo, H. O. U., Greenlees, P. T., Harkness-Brennan, L. J., Huyse, M., Illana, A., Jolie, J., Judson, D. S., Konki, J., Lazarus, I, Madurga, M., Marginean, N., Marginean, R., Mihai, C., Marsh, B. A., Molkanov, P., Mosat, P., Murias, J. R., Nacher, E., Negret, A., Page, R. D., Pascu, S., Perea, A., Pucknell, V, Rahkila, P., Rapisarda, E., Rezynkina, K., Sanchez-Tembleque, V, Schomacker, K., Seliverstov, M. D., Sotty, C., Stan, L., Surder, C., Tengblad, O., Vedia, V., Vinals, S., Wadsworth, R., and Warr, N.

Abstract

A new beta-decaying state in Bi-214 has been identified at the ISOLDE Decay Station at the CERN-ISOLDE facility. A preferred I-pi = (8(-)) assignment was suggested for this state based on the beta-decay feeding pattern to levels in Po-214 and shell-model calculations. The half-life of the I-pi = (8) state was deduced to be T-1/2 = 9.39(10) min. The deexcitation of the levels populated in Po-214 by the beta decay of this state was investigated via gamma-gamma coincidences and a number of new levels and transitions was identified. Shell-model calculations for excited states in Bi-214 and Po-214 were performed using two different effective interactions: the H208 and the modified Kuo-Herling particle interaction. Both calculations agree on the interpretation of the new beta-decaying state as an I-pi = 8 - isomer and allow for tentative assignment of shell-model states to several high-spin states in Po-214.

Published
2021

4. Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive Ra-222 and Ra-228 Beams

Author

Butler, P. A., Gaffney, L. P., Spagnoletti, P., Abrahams, K., Bowry, M., Cederkall, J., de Angelis, G., De Witte, H., Garrett, P. E., Goldkuhle, A., Henrich, C., Illana, A., Johnston, K., Joss, D. T., Keatings, J. M., Kelly, N. A., Komorowska, M., Konki, J., Kroell, T., Lozano, M., Singh, B. S. Nara, O'Donnell, D., Ojala, J., Page, R. D., Pedersen, L. G., Raison, C., Reiter, P., Rodriguez, J. A., Rosiak, D., Rothe, S., Scheck, M., Seidlitz, M., Shneidman, T. M., Siebeck, B., Sinclair, J., Smith, J. F., Stryjczyk, M., Van Duppen, P., Vinals, S., Virtanen, V., Warr, N., Wrzosek-Lipska, K., Zielinska, M., Butler, P. A., Gaffney, L. P., Spagnoletti, P., Abrahams, K., Bowry, M., Cederkall, J., de Angelis, G., De Witte, H., Garrett, P. E., Goldkuhle, A., Henrich, C., Illana, A., Johnston, K., Joss, D. T., Keatings, J. M., Kelly, N. A., Komorowska, M., Konki, J., Kroell, T., Lozano, M., Singh, B. S. Nara, O'Donnell, D., Ojala, J., Page, R. D., Pedersen, L. G., Raison, C., Reiter, P., Rodriguez, J. A., Rosiak, D., Rothe, S., Scheck, M., Seidlitz, M., Shneidman, T. M., Siebeck, B., Sinclair, J., Smith, J. F., Stryjczyk, M., Van Duppen, P., Vinals, S., Virtanen, V., Warr, N., Wrzosek-Lipska, K., and Zielinska, M.

Abstract

There is sparse direct experimental evidence that atomic nuclei can exhibit stable pear shapes arising from strong octupole correlations. In order to investigate the nature of octupole collectivity in radium isotopes, electric octupole (E3) matrix elements have been determined for transitions in Ra-222,Ra-228 nuclei using the method of sub-barrier, multistep Coulomb excitation. Beams of the radioactive radium isotopes were provided by the HIE-ISOLDE facility at CERN. The observed pattern of E3 matrix elements for different nuclear transitions is explained by describing Ra-222 as pear shaped with stable octupole deformation, while Ra-228 behaves like an octupole vibrator.

Published
2020

5. 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., 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., and De Witte, H.

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

6. Decay studies of the long-lived states in Tl-186

Author

Stryjczyk, M., Andel, B., Andreyev, A. N., Cubiss, J., Pakarinen, J., Rezynkina, K., Van Duppen, P., Antalic, S., Berry, T., Borge, M. J. G., Clisu, C., Cox, D. M., De Witte, H., Fraile, L. M., Fynbo, H. O. U., Gaffney, L. P., Harkness-Brennan, L. J., Huyse, M., Illana, A., Judson, D. S., Konki, J., Kurcewicz, J., Lazarus, I, Lica, R., Madurga, M., Marginean, N., Marginean, R., Mihai, C., Mosat, P., Nacher, E., Negret, A., Ojala, J., Ovejas, J. D., Page, R. D., Papadakis, P., Pascu, S., Perea, A., Podolyak, Zs, Pucknell, V, Rapisarda, E., Rotaru, F., Sotty, C., Tengblad, O., Vedia, V., Vinals, S., Wadsworth, R., Warr, N., Wrzosek-Lipska, K., Stryjczyk, M., Andel, B., Andreyev, A. N., Cubiss, J., Pakarinen, J., Rezynkina, K., Van Duppen, P., Antalic, S., Berry, T., Borge, M. J. G., Clisu, C., Cox, D. M., De Witte, H., Fraile, L. M., Fynbo, H. O. U., Gaffney, L. P., Harkness-Brennan, L. J., Huyse, M., Illana, A., Judson, D. S., Konki, J., Kurcewicz, J., Lazarus, I, Lica, R., Madurga, M., Marginean, N., Marginean, R., Mihai, C., Mosat, P., Nacher, E., Negret, A., Ojala, J., Ovejas, J. D., Page, R. D., Papadakis, P., Pascu, S., Perea, A., Podolyak, Zs, Pucknell, V, Rapisarda, E., Rotaru, F., Sotty, C., Tengblad, O., Vedia, V., Vinals, S., Wadsworth, R., Warr, N., and Wrzosek-Lipska, K.

Abstract

Decay spectroscopy of the long-lived states in Tl-186 has been performed at the ISOLDE Decay Station at ISOLDE, CERN. The a decay from the low-spin (2(-)) state in Tl-186 was observed for the first time and a half-life of 3.4(-0.)(4)(+0.5) s was determined. Based on the alpha-decay energy, the relative positions of the long-lived states were fixed, with the (2(-)) state as the ground state, the 7((+)) state at 77(56) keV, and the 10((-)) state at 451(56) keV. The level scheme of the internal decay of the Tl-186(10((-))) state [T-1/2 = 3.40(9) s], which was known to decay solely through emission of 374-keV gamma-ray transition, was extended and a lower limit for the beta-decay branching b(beta) > 5.9(3)% was determined. The extracted retardation factors for the gamma decay of the 10((-) )state were compared to the available data in neighboring odd-odd thallium isotopes indicating the importance of the pi d(3/2) shell in the isomeric decay and significant structure differences between Tl-184 and Tl-186.

Published
2020

7. 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

8. Detailed spectroscopy of doubly magic Sn-132

Author

Benito, J., Fraile, L. M., Korgul, A., Piersa, M., Adamska, E., Andreyev, A. N., Alvarez-Rodriguez, R., Barzakh, A. E., Benzoni, G., Berry, T., Borge, M. J. G., Carmona, M., Chrysalidis, K., Costache, C., Cubiss, J. G., Goodacre, T. Day, De Witte, H., Fedorov, D., V, Fedosseev, V. N., Fernandez-Martinez, G., Fijalkowska, A., Fila, M., Fynbo, H., Galaviz, D., Galve, P., Garcia-Diez, M., Greenlees, P. T., Grzywacz, R., Harkness-Brennan, L. J., Henrich, C., Huyse, M., Ibanez, P., Illana, A., Janas, Z., Jolie, J., Judson, D. S., Karayonchev, V, Kicinska-Habior, M., Konki, J., Kurcewicz, J., Lazarus, I, Lica, R., Lopez-Montes, A., Lund, M., Mach, H., Madurga, M., Marroquin, I, Marsh, B., Martinez, M. C., Mazzocchi, C., Marginean, N., Marginean, R., Miernik, K., Mihai, C., Mihai, R. E., Nacher, E., Negret, A., Olaizola, B., Page, R. D., Paulauskas, S., V, Pascu, S., Perea, A., Pucknell, V, Rahkila, P., Raison, C., Rapisarda, E., Regis, J-M, Rezynkina, K., Rotaru, F., Rothe, S., Sanchez-Parcerisa, D., Sanchez-Tembleque, V, Schomacker, K., Simpson, G. S., Sotty, Ch, Stan, L., Stanoiu, M., Stryjczyk, M., Tengblad, O., Turturica, A., Udias, J. M., Van Duppen, P., Vedia, V., Villa-Abaunza, A., Vinals, S., Walters, W. B., Wadsworth, R., Warr, N., Benito, J., Fraile, L. M., Korgul, A., Piersa, M., Adamska, E., Andreyev, A. N., Alvarez-Rodriguez, R., Barzakh, A. E., Benzoni, G., Berry, T., Borge, M. J. G., Carmona, M., Chrysalidis, K., Costache, C., Cubiss, J. G., Goodacre, T. Day, De Witte, H., Fedorov, D., V, Fedosseev, V. N., Fernandez-Martinez, G., Fijalkowska, A., Fila, M., Fynbo, H., Galaviz, D., Galve, P., Garcia-Diez, M., Greenlees, P. T., Grzywacz, R., Harkness-Brennan, L. J., Henrich, C., Huyse, M., Ibanez, P., Illana, A., Janas, Z., Jolie, J., Judson, D. S., Karayonchev, V, Kicinska-Habior, M., Konki, J., Kurcewicz, J., Lazarus, I, Lica, R., Lopez-Montes, A., Lund, M., Mach, H., Madurga, M., Marroquin, I, Marsh, B., Martinez, M. C., Mazzocchi, C., Marginean, N., Marginean, R., Miernik, K., Mihai, C., Mihai, R. E., Nacher, E., Negret, A., Olaizola, B., Page, R. D., Paulauskas, S., V, Pascu, S., Perea, A., Pucknell, V, Rahkila, P., Raison, C., Rapisarda, E., Regis, J-M, Rezynkina, K., Rotaru, F., Rothe, S., Sanchez-Parcerisa, D., Sanchez-Tembleque, V, Schomacker, K., Simpson, G. S., Sotty, Ch, Stan, L., Stanoiu, M., Stryjczyk, M., Tengblad, O., Turturica, A., Udias, J. M., Van Duppen, P., Vedia, V., Villa-Abaunza, A., Vinals, S., Walters, W. B., Wadsworth, R., and Warr, N.

Abstract

The structure of the doubly magic Sn-132(50)82 has been investigated at the ISOLDE facility at CERN, populated both by the beta(-) decay of In-132 and beta(-)-delayed neutron emission of In-133. The level scheme of Sn-13(2) is greatly expanded with the addition of 68 gamma transitions and 17 levels observed for the first time in the beta decay. The information on the excited structure is completed by new gamma transitions and states populated in the beta-n decay of In-133. Improved delayed neutron emission probabilities are obtained both for In-132 and In-133. Level lifetimes are measured via the advanced time-delayed beta gamma gamma(t) fast-timing method. An interpretation of the level structure is given based on the experimental findings and the particle-hole configurations arising from core excitations both from the N = 82 and Z = 50 shells, leading to positive- and negative-parity particle-hole multiplets. The experimental information provides new data to challenge the theoretical description of Sn-132.

Published
2020

9. beta decay of In-133: gamma emission from neutron-unbound states in Sn-133

Author

Piersa, M., Korgul, A., Fraile, L. M., Benito, J., Adamska, E., Andreyev, A. N., Alvarez-Rodriguez, R., Barzakh, A. E., Benzoni, G., Berry, T., Borge, M. J. G., Carmona, M., Chrysalidis, K., Correia, J. G., Costache, C., Cubiss, J. G., Goodacre, T. Day, De Witte, H., Fedorov, D., V, Fedosseev, V. N., Fernandez-Martinez, G., Fijalkowska, A., Fila, M., Fynbo, H., Galaviz, D., Greenlees, P. T., Grzywacz, R., Harkness-Brennan, L. J., Henrich, C., Huyse, M., Illana, A., Janas, Z., Johnston, K., Judson, D. S., Karanyonchev, V, Kicinska-Habior, M., Konki, J., Kurcewicz, J., Lazarus, I, Lica, R., Mach, H., Madurga, M., Marroquin, I, Marsh, B., Martinez, M. C., Mazzocchi, C., Marginean, N., Marginean, R., Miernik, K., Mihai, C., Nacher, E., Negret, A., Olaizola, B., Page, R. D., Paulaskalas, S., Pascu, S., Perea, A., Pucknell, V, Rahkila, P., Rapisarda, E., Regis, J-M, Rotaru, F., Rothe, S., Sanchez-Tembleque, V, Simpson, G., Sotty, Ch, Stan, L., Stanoiu, M., Stryjczyk, M., Tengblad, O., Turturica, A., Udias, J. M., Van Duppen, P., Vedia, V., Villa, A., Vinals, S., Wadsworth, R., Walters, W. B., Warr, N., Piersa, M., Korgul, A., Fraile, L. M., Benito, J., Adamska, E., Andreyev, A. N., Alvarez-Rodriguez, R., Barzakh, A. E., Benzoni, G., Berry, T., Borge, M. J. G., Carmona, M., Chrysalidis, K., Correia, J. G., Costache, C., Cubiss, J. G., Goodacre, T. Day, De Witte, H., Fedorov, D., V, Fedosseev, V. N., Fernandez-Martinez, G., Fijalkowska, A., Fila, M., Fynbo, H., Galaviz, D., Greenlees, P. T., Grzywacz, R., Harkness-Brennan, L. J., Henrich, C., Huyse, M., Illana, A., Janas, Z., Johnston, K., Judson, D. S., Karanyonchev, V, Kicinska-Habior, M., Konki, J., Kurcewicz, J., Lazarus, I, Lica, R., Mach, H., Madurga, M., Marroquin, I, Marsh, B., Martinez, M. C., Mazzocchi, C., Marginean, N., Marginean, R., Miernik, K., Mihai, C., Nacher, E., Negret, A., Olaizola, B., Page, R. D., Paulaskalas, S., Pascu, S., Perea, A., Pucknell, V, Rahkila, P., Rapisarda, E., Regis, J-M, Rotaru, F., Rothe, S., Sanchez-Tembleque, V, Simpson, G., Sotty, Ch, Stan, L., Stanoiu, M., Stryjczyk, M., Tengblad, O., Turturica, A., Udias, J. M., Van Duppen, P., Vedia, V., Villa, A., Vinals, S., Wadsworth, R., Walters, W. B., and Warr, N.

Abstract

Excited states in Sn-133 were investigated through the beta decay of In-133 at the ISOLDE facility. The ISOLDE Resonance Ionization Laser Ion Source (RILIS) provided isomer-selective ionization for In-133, allowing us to study separately, and in detail, the beta-decay branch of In-133 J(pi)= (9/2(+)) ground state and its J(pi) = (1/2(-)) isomer.Thanks to the large spin difference of the two beta-decaying states of In-133, it is possible to investigate separately the lower and higher spin states in the daughter, Sn-133, and thus to probe independently different single-particle and single-hole levels. We report here new gamma transitions observed in the decay of In-133, including those assigned to the deexcitation of the neutron-unbound states.

Published
2019

10. Normal and intruder configurations in Si- 34 populated in the beta(-) decay of Mg-34 and Al-34

Author

Lica, R., Rotaru, F., Borge, M. J. G., Grevy, S., Negoita, F., Poves, A., Sorlin, O., Andreyev, A. N., Borcea, R., Costache, C., De Witte, H., Fraile, L. M., Greenlees, P. T., Huyse, M., Ionescu, A., Kisyov, S., Konki, J., Lazarus, I, Madurga, M., Marginean, N., Marginean, R., Mihai, C., Mihai, R. E., Negret, A., Nowacki, F., Page, R. D., Pakarinen, J., Pucknell, V, Rahkila, P., Rapisarda, E., Serban, A., Sotty, C. O., Stan, L., Stanoiu, M., Tengblad, O., Turturica, A., Van Duppen, P., Warr, N., Dessagne, Ph, Stora, T., Borcea, C., Calinescu, S., Daugas, J. M., Filipescu, D., Kuti, I, Franchoo, S., Gheorghe, I, Morfouace, P., Morel, P., Mrazek, J., Pietreanu, D., Sohler, D., Stefan, I, Suvaila, R., Toma, S., Ur, C. A., Lica, R., Rotaru, F., Borge, M. J. G., Grevy, S., Negoita, F., Poves, A., Sorlin, O., Andreyev, A. N., Borcea, R., Costache, C., De Witte, H., Fraile, L. M., Greenlees, P. T., Huyse, M., Ionescu, A., Kisyov, S., Konki, J., Lazarus, I, Madurga, M., Marginean, N., Marginean, R., Mihai, C., Mihai, R. E., Negret, A., Nowacki, F., Page, R. D., Pakarinen, J., Pucknell, V, Rahkila, P., Rapisarda, E., Serban, A., Sotty, C. O., Stan, L., Stanoiu, M., Tengblad, O., Turturica, A., Van Duppen, P., Warr, N., Dessagne, Ph, Stora, T., Borcea, C., Calinescu, S., Daugas, J. M., Filipescu, D., Kuti, I, Franchoo, S., Gheorghe, I, Morfouace, P., Morel, P., Mrazek, J., Pietreanu, D., Sohler, D., Stefan, I, Suvaila, R., Toma, S., and Ur, C. A.

Abstract

The structure of Si-34 was studied through gamma spectroscopy separately in the beta(-) decays of Mg-34 and Al-34 at the ISOLDE facility of CERN. Different configurations in Si-34 were populated independently from the two recently identified beta-decaying states in Al-34 having spin-parity assignments J(pi) = 4(-) dominated by the normal configuration pi(d(5/2))(-1) circle times nu(f(7/2)) and J(pi) = 1(+) by the intruder configuration pi(d(5/2))(-1) circle times nu(d(3/2))(-1) (f(7/2))(2). The paper reports on spectroscopic properties of Si-34 such as an extended level scheme, spin and parity assignments based on log(ft) values and gamma-ray branching ratios, absolute beta feeding intensities, and neutron emission probabilities. A total of 11 newly identified levels and 26 transitions were added to the previously known level scheme of Si-34. Large scale shell-model calculations using the SDPF-U-MIX interaction, able to treat higher order intruder configurations, are compared with the new results and conclusions are drawn concerning the predictive power of SDPF-U-MIX, the N = 20 shell gap, the level of mixing between normal and intruder configurations for the 0(1)(+), 0(2)(+), and 2(1)(+) states, and the absence of triaxial deformation in Si-3(4).

Published
2019

11. First Accurate Normalization of the beta-delayed alpha Decay of N-16 and Implications for the C-12(alpha,gamma)O-16 Astrophysical Reaction Rate

Author

Kirsebom, O. S., Tengblad, O., Lica, R., Munch, M., Riisager, K., Fynbo, H. O. U., Borge, M. J. G., Madurga, M., Marroquin, I., Andreyev, A. N., Berry, T. A., Christensen, E. R., Fernandez, P. Diaz, Doherty, D. T., Van Duppen, P., Fraile, L. M., Gallardo, M. C., Greenlees, P. T., Harkness-Brennan, L. J., Hubbard, N., Huyse, M., Jensen, J. H., Johansson, H., Jonson, B., Judson, D. S., Konki, J., Lazarus, I., Lund, M. V., Marginean, N., Marginean, R., Perea, A., Mihai, C., Negret, A., Page, R. D., Pucknell, V., Rahkila, P., Sorlin, O., Sotty, C., Swartz, J. A., Sorensen, H. B., Toernqvist, H., Vedia, V., Warr, N., De Witte, H., Kirsebom, O. S., Tengblad, O., Lica, R., Munch, M., Riisager, K., Fynbo, H. O. U., Borge, M. J. G., Madurga, M., Marroquin, I., Andreyev, A. N., Berry, T. A., Christensen, E. R., Fernandez, P. Diaz, Doherty, D. T., Van Duppen, P., Fraile, L. M., Gallardo, M. C., Greenlees, P. T., Harkness-Brennan, L. J., Hubbard, N., Huyse, M., Jensen, J. H., Johansson, H., Jonson, B., Judson, D. S., Konki, J., Lazarus, I., Lund, M. V., Marginean, N., Marginean, R., Perea, A., Mihai, C., Negret, A., Page, R. D., Pucknell, V., Rahkila, P., Sorlin, O., Sotty, C., Swartz, J. A., Sorensen, H. B., Toernqvist, H., Vedia, V., Warr, N., and De Witte, H.

Abstract

The C-12(alpha,gamma)O-16 reaction plays a central role in astrophysics, but its cross section at energies relevant for astrophysical applications is only poorly constrained by laboratory data. The reduced a width, gamma(11), of the bound 1(-) level in O-16 is particularly important to determine the cross section. The magnitude of gamma(11) is determined via sub-Coulomb a-transfer reactions or the beta-delayed a decay of N-16, but the latter approach is presently hampered by the lack of sufficiently precise data on the beta-decay branching ratios. Here we report improved branching ratios for the bound 1(-) level [b(beta,11) = (5.02 +/- 0.10) x 10(-2)] and for beta-delayed alpha emission [b(beta alpha) = (1.59 +/- 0.06) x 10(-5)]. Our value for b(beta alpha) is 33% larger than previously held, leading to a substantial increase in gamma(11). Our revised value for gamma(11) is in good agreement with the value obtained in a-transfer studies and the weighted average of the two gives a robust and precise determination of gamma(11), which provides significantly improved constraints on the C-12(alpha,gamma) cross section in the energy range relevant to hydrostatic He burning.

Published
2018

12. Lifetime measurements of excited states in W-162 and W-164 and the evolution of collectivity in rare-earth nuclei

Author

Doncel, Maria, Cederwall, Bo, Qi, Chong, Li, Hongjie J., Jakobsson, Ulrika, Auranen, K., Boenig, S., Drummond, M. C., Grahn, T., Greenlees, P. T., Herzan, A., Joss, D. T., Julin, R., Juutinen, S., Konki, J., Kroell, T., Leino, M., McPeake, C., O'Donnell, D., Page, R. D., Pakarinen, J., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Saygi, B., Scholey, C., Sorri, J., Stolze, S., Taylor, M. J., Thornthwaite, A., Uusitalo, J., and Ege Üniversitesi

Subjects
Physical Sciences, Fysik
Abstract

WOS: 000400140500006, Lifetimes of the first excited 2(+) states in the extremely neutron- deficient W-162 and W-164 nuclei have been measured using the recoil distance Doppler shift technique. Experimental B(E2) data for the isotopic chains of hafnium, tungsten, and osmium, from the midshell region near the beta-stability line towards the N = 82 closed shell and the most neutron-deficient nuclides, are compared with predictions of nuclear deformations and 2(1)(+) -> 0(g.s)(.+) reduced transition strengths from different classes of state-of-the-art theoretical model calculations. The results reveal striking differences and deficiencies in the predictive power of current nuclear structure models., Swedish Research CouncilSwedish Research Council [621-2014-5558]; United Kingdom Science and Technology Facilities Council (STFC)Science & Technology Facilities Council (STFC)Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)Japan Society for the Promotion of Science; EU 7th Framework Programme, Integrating Activities Transnational Access [262010 ENSAR]; Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL), This work was supported by the Swedish Research Council under Grant No. 621-2014-5558, the United Kingdom Science and Technology Facilities Council (STFC), the EU 7th Framework Programme, Integrating Activities Transnational Access, Project No. 262010 ENSAR, and the Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL). The authors acknowledge the support of the GAMMAPOOL for the JUROGAM detectors.

Published
2017

13. Identification of the crossing point at N=21 between normal and intruder configurations

Author

Lica, R., Rotaru, F., Borge, M. J. G., Grevy, S., Negoita, F., Poves, A., Sorlin, O., Andreyev, A. N., Borcea, R., Costache, C., De Witte, H., Fraile, L. M., Greenlees, P. T., Huyse, M., Ionescu, A., Kisyov, S., Konki, J., Lazarus, I., Madurga, M., Marginean, N., Marginean, R., Mihai, C., Mihai, R. E., Negret, A., Page, R. D., Pakarinen, J., Pascu, S., Pucknell, V., Rahkila, P., Rapisarda, E., Serban, A., Sotty, C. O., Stan, L., Stanoiu, M., Tengblad, O., Turturica, A., Van Duppen, P., Wadsworth, R., Warr, N., Lica, R., Rotaru, F., Borge, M. J. G., Grevy, S., Negoita, F., Poves, A., Sorlin, O., Andreyev, A. N., Borcea, R., Costache, C., De Witte, H., Fraile, L. M., Greenlees, P. T., Huyse, M., Ionescu, A., Kisyov, S., Konki, J., Lazarus, I., Madurga, M., Marginean, N., Marginean, R., Mihai, C., Mihai, R. E., Negret, A., Page, R. D., Pakarinen, J., Pascu, S., Pucknell, V., Rahkila, P., Rapisarda, E., Serban, A., Sotty, C. O., Stan, L., Stanoiu, M., Tengblad, O., Turturica, A., Van Duppen, P., Wadsworth, R., and Warr, N.

Abstract

The beta(-) decay of Mg-34 was used to study the Al-34 nucleus through. spectroscopy at the Isotope Separator On-Line facility of CERN. Previous studies identified two beta-decaying states in Al-34 having spin-parity assignments J(pi) = 4(-) dominated by the normal configuration pi(d(5/2))(-1)circle times nu(f(7/2)) and J(pi) = 1(+) by the intruder configuration pi(d(5/2))(-1) circle times nu(d(3/2))(-1) (f(7/2))(2). Their unknown ordering and relative energy have been the subject of debate for the placement of Al-34 inside or outside the N = 20 island of inversion. We report here that the 1(+) intruder lies only 46.6 keV above the 4(-) ground state. In addition, a new half-life of T-1/2 = 44.9(4) ms, that is twice as long as the previously measured 20(10) ms, has been determined for Mg-34. Large-scale shell-model calculations with the recently developed SDPF-U-MIX interaction are compared with the new data and used to interpret the mechanisms at play at the very border of the N = 20 island of inversion.

Published
2017

14. Reduced transition probabilities along the yrast line in W-166

Author

Saygi, B., Joss, D. T., Page, R. D., Grahn, T., Simpson, J., O'Donnell, D., Alharshan, G., Auranen, K., Back, T., Boening, S., Braunroth, T., Carroll, R. J., Cederwall, B., Cullen, D. M., Dewald, A., Doncel, M., Donosa, L., Drummond, M. C., Ertugral, F., Erturk, S., Fransen, C., Greenlees, P. T., Hackstein, M., Hauschild, K., Herzan, A., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Konki, J., Kroell, T., Labiche, M., Lopez-Martens, A., McPeake, C. G., Moradi, F., Moeller, O., Mustafa, M., Nieminen, P., Pakarinen, J., Partanen, J., Peura, P., Procter, M., Rahkila, P., Rother, W., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Taylor, M. J., Thornthwaite, A., Uusitalo, J., Saygi, B., Joss, D. T., Page, R. D., Grahn, T., Simpson, J., O'Donnell, D., Alharshan, G., Auranen, K., Back, T., Boening, S., Braunroth, T., Carroll, R. J., Cederwall, B., Cullen, D. M., Dewald, A., Doncel, M., Donosa, L., Drummond, M. C., Ertugral, F., Erturk, S., Fransen, C., Greenlees, P. T., Hackstein, M., Hauschild, K., Herzan, A., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Konki, J., Kroell, T., Labiche, M., Lopez-Martens, A., McPeake, C. G., Moradi, F., Moeller, O., Mustafa, M., Nieminen, P., Pakarinen, J., Partanen, J., Peura, P., Procter, M., Rahkila, P., Rother, W., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Taylor, M. J., Thornthwaite, A., and Uusitalo, J.

Abstract

Lifetimes of excited states in the yrast band of the neutron-deficient nuclide W-166 have been measured utilizing the DPUNS plunger device at the target position of the JUROGAM II gamma-ray spectrometer in conjunction with the RITU gas-filled separator and the GREAT focal-plane spectrometer. Excited states in W-166 were populated in the Mo-92(Kr-78, 4p) reaction at a bombarding energy of 380 MeV. The measurements reveal a low value for the ratio of reduced transitions probabilities for the lowest-lying transitions B(E2; 4(+)-> 2(+)) / B(E2; 2(+)-> 0(+)) = 0.33(5), compared with the expected ratio for an axially deformed rotor (B-4/2 = 1.43).

Published
2017

15. Precision measurements of proton emission from the ground states of Ta-156 and Re-160

Author

Darby, I. G., Page, R. D., Joss, D. T., Bianco, L., Grahn, T., Judson, D. S., Simpson, J., Eeckhaudt, S., Greenlees, P. T., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Leppanen, A-P., Nyman, M., Rahkila, P., Saren, J., Scholey, C., Steer, A. N., Uusitalo, J., Venhart, M., Erturk, S., Gall, B., Hadinia, B., Darby, Iain -- 0000-0003-2091-2616, Scholey, Catherine -- 0000-0002-8743-6071, Jones, Pete -- 0000-0001-7480-6603, Grahn, Tuomas -- 0000-0002-6255-2279, and [Darby, I. G. -- Page, R. D. -- Joss, D. T. -- Bianco, L. -- Grahn, T. -- Judson, D. S.] Univ Liverpool, Dept Phys, Liverpool L69 7ZE, Merseyside, England -- [Simpson, J.] Daresbury Lab, STFC, Warrington WA4 4AD, Cheshire, England -- [Eeckhaudt, S. -- Greenlees, P. T. -- Jones, P. M. -- Julin, R. -- Juutinen, S. -- Ketelhut, S. -- Leino, M. -- Leppanen, A-P. -- Nyman, M. -- Rahkila, P. -- Saren, J. -- Scholey, C. -- Steer, A. N. -- Uusitalo, J. -- Venhart, M.] Univ Jyvaskyla, Dept Phys, FIN-40014 Jyvaskyla, Finland -- [Erturk, S.] Nigde Univ, Fen Edebiyat Fak, Fiz Bolumu, Nigde, Turkey -- [Gall, B.] ULP Strasbourg, IPHC, CNRS, IN2P3, F-67037 Strasbourg 2, France -- [Hadinia, B.] Royal Inst Technol, Alba Nova Ctr, S-10691 Stockholm, Sweden

Abstract

WOS: 000291798600001, The decays of the pi d(3/2) ground states of Ta-156 and Re-160 have been studied in detail using the GREAT spectrometer. More than 7000 Re-160 nuclei were produced in reactions of 290- and 300-MeV Ni-58 ions with an isotopically enriched Cd-106 target and separated in flight using the RITU separator. The proton and alpha decays of the pi d(3/2) level were confirmed and the half-life and branching ratios of this state were determined with improved precision to be t(1/2) = 611 +/- 7 mu s and b(p) = 89 +/- 1% and b(alpha) = 11 +/- 1%, respectively. The alpha-decay branch populated the ground state of Ta-156, allowing improved values for the proton-decay energy and half-life to be obtained (E-p = 1011 +/- 5 keV; t(1/2) = 106 +/- 4 ms). The beta decay of this level was identified for the first time and a branching ratio of b(beta) = 29 +/- 3% was deduced. The spectroscopic factors deduced from these measurements are compared with predictions., UK Science and Technology Facilities Council; Swedish Natural Science Research Council; Academy of Finland [44875]; European Union [RII3-CT-2004-506065, HPMT-CT-2001-00250]; [209430]; [111965]; Science and Technology Facilities Council [ST/J000108/1, ST/F012039/1, ST/G008620/1, ST/J000094/1, EP/C015266/1, EP/C015371/1, ST/G008671/1], The authors thank the technical staff at the University of Jyvaskyla for their excellent support and Paul Morrall from Daresbury Laboratory for making the targets. This work was supported by the UK Science and Technology Facilities Council; the Swedish Natural Science Research Council; the Academy of Finland through the Finnish Centre of Excellence Programme (Project No. 44875 Nuclear and Condensed Matter Physics Programme at JYFL) and support for C.S. (Contract No. 209430) and P.T.G. (Contract No. 111965); the European Union Sixth Framework Contract EURONS (Contract No. RII3-CT-2004-506065); and the European Union Marie Curie Programme (Contract No. HPMT-CT-2001-00250).

Published
2011

16. In-beam gamma-ray spectroscopy of the N=85 isotones W-159 and Re-160

Author

Sapple, P. J., Page, R. D., Joss, D. T., Bianco, L., Grahn, T., Pakarinen, J., Thomson, J., Simpson, J., O'Donnell, D., Erturk, S., Greenlees, P. T., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Nyman, M., Peura, P., Puurunen, A., Rahkila, P., Ruotsalainen, P., Saren, J., Scholey, C., Uusitalo, J., Scholey, Catherine -- 0000-0002-8743-6071, Pakarinen, Janne -- 0000-0001-8944-8757, O'Donnell, David -- 0000-0002-4710-3803, Ruotsalainen, Panu -- 0000-0002-8335-452X, Jones, Pete -- 0000-0001-7480-6603, Grahn, Tuomas -- 0000-0002-6255-2279, Jakobsson, Ulrika -- 0000-0001-9741-141X, Peura, Pauli -- 0000-0002-8541-0169, and [Sapple, P. J. -- Page, R. D. -- Joss, D. T. -- Bianco, L. -- Grahn, T. -- Pakarinen, J. -- Thomson, J.] Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England -- [Simpson, J. -- O'Donnell, D.] STFC Daresbury Lab, Warrington WA4 4AD, Cheshire, England -- [Erturk, S.] Nigde Univ, Fen Edebiyat Fak, Fiz Bolumu, TR-51100 Nigde, Turkey -- [Greenlees, P. T. -- Jakobsson, U. -- Jones, P. M. -- Julin, R. -- Juutinen, S. -- Ketelhut, S. -- Leino, M. -- Nyman, M. -- Peura, P. -- Puurunen, A. -- Rahkila, P. -- Ruotsalainen, P. -- Saren, J. -- Scholey, C. -- Uusitalo, J.] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland

Abstract

WOS: 000296522000001, Excited states have been identified in the isotones W-159(74) and Re-160(75), which were produced in fusion-evaporation reactions of a beam of 310-MeV Ni-58 ions with an isotopically enriched Cd-106 target. The strongest gamma-ray transitions in W-159 and Re-160 are interpreted as continuing the regular sequence of states identified in lighter N = 85 isotones that are built upon 9/2(-) and 10(+) states, respectively. The half-life of Hf-155, the beta-decaying daughter of the a decay of W-159, was measured with improved precision to be 840 +/- 30 ms., UK Science and Technology Facilities Council; EU [RII3-CT-2004-506065 (EURONS)]; Academy of Finland [213503, 209430, 111965]; Science and Technology Facilities Council [ST/J000108/1, ST/G008620/1, EP/C015371/1, ST/J000094/1, EP/C015266/1, ST/G008671/1], The authors thank the technical staff at the University of Jyvaskyla for their excellent support and Paul Morrall for making the targets. This work has been supported by the UK Science and Technology Facilities Council; by the EU 6th Framework Programme "Integrating Infrastructure Initiative Transnational Access," Contract No. RII3-CT-2004-506065 (EURONS); and by the Academy of Finland under the Finnish Centre of Excellence Programme 2006-2011 (Nuclear and Accelerator Based Physics Programme at JYFL), Contract No. 213503. C. S. (Contract No. 209430) and P. T. G. (Contract No. 111965) acknowledge the support of the Academy of Finland. We thank the GAMMAPOOL European Spectroscopy Resource for the loan of germanium detectors for JUROGAM, and we thank the French CNRS/IN2P3 for the use of the TNT2 digital electronics.

Published
2011

17. Isomeric and ground-state properties of Pt-171(78), Os-167(76), and W-163(74)

Author

Scholey, C., Andgren, K., Bianco, L., Cederwall, B., Darby, I. G., Eeckhaudt, S., Erturk, S., Hornillos, M. B. Gomez, Grahn, T., Greenlees, P. T., Hadinia, B., Ideguchi, E., Jones, P., Joss, D. T., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Leppanen, A.-P., Nieminen, P., Niikura, M., Nyman, M., O'Donnell, D., Page, R. D., Pakarinen, J., Rahkila, P., Saren, J., Sandzelius, M., Simpson, J., Sorri, J., Thomson, J., Uusitalo, J., Venhart, M., Cederwall, Bo -- 0000-0003-1771-2656, Darby, Iain -- 0000-0003-2091-2616, Niikura, Megumi -- 0000-0002-5940-2667, Scholey, Catherine -- 0000-0002-8743-6071, Pakarinen, Janne -- 0000-0001-8944-8757, O'Donnell, David -- 0000-0002-4710-3803, Grahn, Tuomas -- 0000-0002-6255-2279, Jones, Pete -- 0000-0001-7480-6603, Gomez Hornillos -- 0000-0002-9282-9195, and [Scholey, C. -- Darby, I. G. -- Eeckhaudt, S. -- Grahn, T. -- Greenlees, P. T. -- Jones, P. -- Julin, R. -- Juutinen, S. -- Ketelhut, S. -- Leino, M. -- Leppanen, A.-P. -- Nieminen, P. -- Nyman, M. -- Pakarinen, J. -- Rahkila, P. -- Saren, J. -- Sandzelius, M. -- Sorri, J. -- Uusitalo, J. -- Venhart, M.] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland -- [Andgren, K. -- Cederwall, B. -- Hadinia, B. -- Sandzelius, M.] Royal Inst Technol, S-10691 Stockholm, Sweden -- [Bianco, L. -- Darby, I. G. -- Joss, D. T. -- Page, R. D. -- Thomson, J.] Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England -- [Erturk, S.] Nigde Univ, Dept Phys, TR-51200 Nigde, Turkey -- [Hornillos, M. B. Gomez -- O'Donnell, D. -- Simpson, J.] STFC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England -- [Ideguchi, E. -- Niikura, M.] Univ Tokyo, Ctr Nucl Study, Wako, Saitama 3510198, Japan -- [Venhart, M.] Comenius Univ, Dept Nucl Phys & Biophys, Bratislava 84248, Slovakia

Abstract

WOS: 000274002700018, Decay paths, half-lives, and excitation energies of the i(13/2) bandheads of the neutron-deficient nuclei Pt-171, Os-167, and W-163 have been established for the first time. Gamma-ray transitions, X-rays, and internal conversion electrons have been observed, allowing internal-conversion coefficients to be measured and B(M2) reduced transition probabilities to be extracted. These results elucidate the low-lying single-quasiparticle structures and give the energy level spacings between the nu f(7/2), nu h(9/2), and nu i(13/2) quasineutron states for all three nuclei. Moreover, ground-state spin assignments have been made for the first time, along with the measurement of the alpha-decay branching ratio for Pt-171. The decay paths of the i(13/2) bandheads were followed by favored alpha decays, indicating that all three nuclei have the same I-pi = 7/2(-) ground state., Academy of Finland [44875, 213503]; Swedish Research Council; Goran Gustafsson Foundation; EU [HPRI-CT-1999-00044]; EXOTAG [HPRI-1999-CT-50017]; UK Engineering and Physical Sciences Research Council and Science; Technology Facilities Council [209430, 121110, 111965]; Slovak Research and Development Agency [APVV-20-006205]; Science and Technology Facilities Council [EP/C543157/1, EP/C015371/1, EP/C015266/1, ST/J000108/1, ST/G008671/1, ST/F012039/1, ST/G008620/1], This work has been supported by the Academy of Finland under the Finnish Centre of Excellence Programme (Project Nos. 44875 and 213503), the Swedish Research Council, the Goran Gustafsson Foundation, the EU FP5(HPRI-CT-1999-00044) and EXOTAG (HPRI-1999-CT-50017), through the EU-FP6-I3 project EURONS (RII3-CT-2004-506065), and the UK Engineering and Physical Sciences Research Council and Science and Technology Facilities Council. C. S. (209430), P.N. (121110), and P. T. G. (111965) acknowledge the support of the Academy of Finland; V. M., M. S., and I. G. D. acknowledge support from the EC Marie Curie Actions grant; V. M. acknowledges the Slovak Research and Development Agency (Contract No. APVV-20-006205); and E. I. and M. N. support from the JSPS Core-to-Core Program, International Research Network for Exotic Femto Systems. We thank the UK/France (STFC/IN2P3) Loan Pool and GAMMAPOOL European Spectroscopy Resource for the loan of the detectors for JUROGAM and GSI for the loan of the VEGA (1/4018/07) detectors.

Published
2010

18. Collective excitations in the transitional nuclei Re-163 and Re-165

Author

Davis-Merry, T. R., Joss, D. T., Page, R. D., Simpson, J., Paul, E. S., Ali, F. A., Gomez-Hornillos, M. B., and 0-Belirlenecek

Subjects
0-Belirlenecek
Abstract

WOS: 000351510400001, Excited states in the neutron-deficient nuclei (163)(75) Re-88 and (165)(75) Re-90 were populated in the Cd-106(Ni-60, p2n gamma) and Mo-92(Kr-78, 3p2n gamma) fusion-evaporation reactions at bombarding energies of 270 and 380 MeV, respectively.. rays were detected at the target position using the JUROGAM spectrometer while recoiling ions were separated in-flight by the RITU gas-filled recoil separator and implanted in the GREAT spectrometer. The energy level schemes for Re-163 and Re-165 were identified using recoil-decay correlation techniques. At low spin, the yrast bands of these isotopes consist of signature partner bands based on a single pi h(11/2) quasiproton configuration. The bands display large energy splitting consistent with the soft triaxial shape typical of transitional nuclei above N = 82. The configurations of the excited states are proposed within the framework of the cranked shell model., UK Science and Technology Facilities Council; EU 6th Framework Programme, "Integrating Infrastructure Initiative-Transnational Access" [506065]; Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator-Based Physics Programme at JYFL); Academy of Finland [121110, 209430]; Science and Technology Facilities Council [EP/D002257/1, ST/J000108/1, ST/J000094/1, EP/E004385/1, EP/C015266/1, ST/L005670/1, ST/G008671/1, ST/L005689/1], The authors express their gratitude to the staff of the Accelerator Laboratory at the University of Jyvaskyla for their excellent technical support. The authors also wish to thank Paul Morrall of the STFC Daresbury Laboratory for the preparation of the targets used in this work. Financial support for this work was provided by the UK Science and Technology Facilities Council and by the EU 6th Framework Programme, "Integrating Infrastructure Initiative-Transnational Access," Contract No. 506065 (EURONS), and by the Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator-Based Physics Programme at JYFL). P.T.G (Grant No. 121110) and C.S. (Grant No. 209430) acknowledge the support of the Academy of Finland.

Published
2015

19. gamma-ray spectroscopy of Ta-163

Author

Sandzelius, M., Cederwall, B., Ganioglu, E., Thomson, J., Andgren, K., Bianco, L., Back, T., Eeckhaudt, S., Ertuerk, S., Hornillos, M. B. Gomez, Grahn, T., Greenlees, P. T., Hadinia, B., Johnson, A., Jones, P. M., Joss, D. T., Julin, R., Juutinen, S., Ketelhut, S., Khaplanov, A., Leino, M., Nyman, M., Page, R. D., Rahkila, P., Saren, J., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., Wyss, R., Cederwall, Bo -- 0000-0003-1771-2656, Scholey, Catherine -- 0000-0002-8743-6071, Wyss, Ramon A. -- 0000-0001-6899-2964, Grahn, Tuomas -- 0000-0002-6255-2279, Jones, Pete -- 0000-0001-7480-6603, Back, Torbjorn -- 0000-0003-1996-0805, and [Sandzelius, M. -- Cederwall, B. -- Ganioglu, E. -- Andgren, K. -- Back, T. -- Hadinia, B. -- Johnson, A. -- Khaplanov, A. -- Wyss, R.] Royal Inst Technol, Dept Phys, S-10691 Stockholm, Sweden -- [Sandzelius, M. -- Eeckhaudt, S. -- Grahn, T. -- Greenlees, P. T. -- Jones, P. M. -- Julin, R. -- Juutinen, S. -- Ketelhut, S. -- Leino, M. -- Nyman, M. -- Rahkila, P. -- Saren, J. -- Scholey, C. -- Sorri, J. -- Uusitalo, J.] Univ Jyvaskyla, Dept Phys, FIN-40014 Jyvaskyla, Finland -- [Thomson, J. -- Bianco, L. -- Joss, D. T. -- Page, R. D.] Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England -- [Ertuerk, S. -- Hornillos, M. B. Gomez -- Simpson, J.] CCLRC Daresbury Lab, Warrington WA4 4AD, Cheshire, England -- [Ganioglu, E.] Univ Istanbul, Fac Sci, Dept Phys, TR-34459 Istanbul, Turkey -- Nigde Univ, Fac Sci, Dept Phys, TR-51200 Nigde, Turkey

Abstract

WOS: 000272313000030, Excited states in Ta-163 have been identified for the first time using the Cd-106(Ni-60,3p) fusion evaporation reaction. gamma rays were detected using the JUROGAM gamma-ray spectrometer and recoil discrimination was achieved using the recoil ion transport unit (RITU) gas-filled separator in conjunction with the GREAT spectrometer situated at the focal plane of the RITU. The yrast states are assigned to a strongly coupled rotational band based on a pi h(11/2) configuration. This structure exhibits large signature splitting at low spins that disappears after the paired band crossing because of the alignment of a pair of i(13/2) neutrons. This effect is ascribed to triaxial shape changes induced by the core-polarizing properties of the deformation-aligned h(11/2) proton and the rotation-aligned i(13/2) neutrons. Two additional strongly coupled band structures have been established and are discussed in terms of octupole-vibrational and two-quasiparticle excitations built on the yrast structure. The experimental results are compared with predictions from cranked-shell-model and total-Routhian-surface calculations., Swedish Research Council; Goran Gustafsson Foundation; Academy of Finland under the Finnish Centre of Excellence Programme 2006-2011 [44875]; UK Science and Technology Facilities Council; European Union [HPRI-CT-1999-00044]; NordForsk [070315]; Turkish Atomic Energy Authority (TAEK) [DPT-04K120100-4]; Finnish Academy [209430-111965]; UK/France [EPSRC/IN2P3]; Science and Technology Facilities Council [ST/G008620/1, EP/C015266/1, ST/F012039/1, ST/G008671/1, EP/C015371/1, ST/J000108/1, EP/C543157/1], The authors thank the crew at the Accelerator Laboratory at the University of Jyvraskyla for their excellent technical support. Further support for this work has been provided by the Swedish Research Council, the Goran Gustafsson Foundation, the Academy of Finland under the Finnish Centre of Excellence Programme 2006-2011 (Project No. 44875, Nuclear and Condensed Matter Physics Programme at JYFL), the UK Science and Technology Facilities Council and the European Union Fifth Framework Programme "Improving Human Potential-Access to Research Infrastructure" (Contract No. HPRI-CT-1999-00044), the Nordic Infrastructure support by NordForsk (Project 070315), and the Turkish Atomic Energy Authority (TAEK) under Project No. DPT-04K120100-4. C. S. and P. T. G. acknowledge support from the Finnish Academy (Contract No. 209430-111965). We also thank the UK/France (EPSRC/IN2P3) Detector Loan Pool and the EUROBALL owners committee (gamma-pool network) for the loan of the EUROGAM detectors of JUROGAM and GSI for the loan of two additional VEGA clover detectors.

Published
2009

20. Fast-timing study of the l-forbidden 1/2(+) -> 3/2(+) M1 transition in Sn-129

Author

Lica, R., Mach, H., Fraile, L. M., Gargano, A., Borge, M. J. G., Marginean, N., Sotty, C. O., Vedia, V., Andreyev, A. N., Benzoni, G., Bomans, P., Borcea, R., Coraggio, L., Costache, C., De Witte, H., Flavigny, F., Fynbo, H., Gaffney, L. P., Greenlees, P. T., Harkness-Brennan, L. J., Huyse, M., Ibanez, P., Judson, D. S., Konki, J., Korgul, A., Kroell, T., Kurcewicz, J., Lalkovski, S., Lazarus, I., Lund, M. V., Madurga, M., Marginean, R., Marroquin, I., Mihai, C., Mihai, R. E., Morales, A. I., Nacher, E., Negret, A., Page, R. D., Pakarinen, J., Pascu, S., Paziy, V., Perea, A., Perez-Liva, M., Picado, E., Pucknell, V., Rapisarda, E., Rahkila, P., Rotaru, F., Swartz, J. A., Tengblad, O., Van Duppen, P., Vidal, M., Wadsworth, R., Walters, W. B., Warr, N., Lica, R., Mach, H., Fraile, L. M., Gargano, A., Borge, M. J. G., Marginean, N., Sotty, C. O., Vedia, V., Andreyev, A. N., Benzoni, G., Bomans, P., Borcea, R., Coraggio, L., Costache, C., De Witte, H., Flavigny, F., Fynbo, H., Gaffney, L. P., Greenlees, P. T., Harkness-Brennan, L. J., Huyse, M., Ibanez, P., Judson, D. S., Konki, J., Korgul, A., Kroell, T., Kurcewicz, J., Lalkovski, S., Lazarus, I., Lund, M. V., Madurga, M., Marginean, R., Marroquin, I., Mihai, C., Mihai, R. E., Morales, A. I., Nacher, E., Negret, A., Page, R. D., Pakarinen, J., Pascu, S., Paziy, V., Perea, A., Perez-Liva, M., Picado, E., Pucknell, V., Rapisarda, E., Rahkila, P., Rotaru, F., Swartz, J. A., Tengblad, O., Van Duppen, P., Vidal, M., Wadsworth, R., Walters, W. B., and Warr, N.

Abstract

The levels in Sn-129 populated from the beta(-) decay of In-129 isomers were investigated at the ISOLDE facility of CERN using the newly commissioned ISOLDE Decay Station (IDS). The lowest 1/2(+) state and the 3/2(+) ground state in 129Sn are expected to have configurations dominated by the neutron s(1/2) (l = 0) and d(3/2) (l = 2) single-particle states, respectively. Consequently, these states should be connected by a somewhat slow l-forbidden M1 transition. Using fast-timing spectroscopy we havemeasured the half-life of the 1/2(+) 315.3-keV state, T-1/2 = 19(10) ps, which corresponds to a moderately fast M1 transition. Shell-model calculations using the CD-Bonn effective interaction, with standard effective charges and g factors, predict a 4-ns half-life for this level. We can reconcile the shell-model calculations to the measured T-1/2 value by the renormalization of the M1 effective operator for neutron holes.

Published
2016

21. Excited states and reduced transition probabilities in Os-168

Author

Grahn, T., Stolze, S., Joss, D. T., Page, R. D., Saygi, B., O'Donnell, D., Akmali, M., Andgren, K., Bianco, L., Cullen, D. M., Dewald, A., Greenlees, P. T., Heyde, K., Iwasaki, H., Jakobsson, U., Jones, P., Judson, D. S., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Lumley, N., Mason, P. J. R., Moeller, O., Nomura, K., Nyman, M., Petts, A., Peura, P., Pietralla, N., Pissulla, Th., Rahkila, P., Sapple, P. J., Saren, J., Scholey, C., Simpson, J., Sorri, J., Stevenson, P. D., Uusitalo, J., Watkins, H. V., Wood, J. L., Grahn, T., Stolze, S., Joss, D. T., Page, R. D., Saygi, B., O'Donnell, D., Akmali, M., Andgren, K., Bianco, L., Cullen, D. M., Dewald, A., Greenlees, P. T., Heyde, K., Iwasaki, H., Jakobsson, U., Jones, P., Judson, D. S., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Lumley, N., Mason, P. J. R., Moeller, O., Nomura, K., Nyman, M., Petts, A., Peura, P., Pietralla, N., Pissulla, Th., Rahkila, P., Sapple, P. J., Saren, J., Scholey, C., Simpson, J., Sorri, J., Stevenson, P. D., Uusitalo, J., Watkins, H. V., and Wood, J. L.

Abstract

The level scheme of the neutron-deficient nuclide Os-168 has been extended and mean lifetimes of excited states have been measured by the recoil distance Doppler-shift method using the JUROGAM gamma-ray spectrometer in conjunction with the IKP Koln plunger device. The 168Os. rays were measured in delayed coincidence with recoiling fusion-evaporation residues detected at the focal plane of the RITU gas-filled separator. The ratio of reduced transition probabilities B(E2; 4(1)(+)-> 2(1)(+))/B(E2; 2(1)(+)-> 0(1)(+)) is measured to be 0.34(18), which is very unusual for collective band structures and cannot be reproduced by interacting boson model (IBM-2) calculations based on the SkM* energy-density functional.

Published
2016

22. Shape coexistence in neutron-deficient Hg isotopes studied via lifetime measurements in Hg-184,Hg-186 and two-state mixing calculations

Author

Gaffney, L. P., Hackstein, M., Page, R. D., Grahn, T., Scheck, M., Butler, P. A., Bertone, P. F., Bree, N., Carroll, R. J., Carpenter, M. P., Chiara, C. J., Dewald, A., Filmer, F., Fransen, C., Huyse, M., Janssens, R. V. F., Joss, D. T., Julin, R., Kondev, F. G., Nieminen, P., Pakarinen, J., Rigby, S. V., Rother, W., Van Duppen, P., Watkins, H. V., Wrzosek-Lipska, K., Zhu, S., Gaffney, L. P., Hackstein, M., Page, R. D., Grahn, T., Scheck, M., Butler, P. A., Bertone, P. F., Bree, N., Carroll, R. J., Carpenter, M. P., Chiara, C. J., Dewald, A., Filmer, F., Fransen, C., Huyse, M., Janssens, R. V. F., Joss, D. T., Julin, R., Kondev, F. G., Nieminen, P., Pakarinen, J., Rigby, S. V., Rother, W., Van Duppen, P., Watkins, H. V., Wrzosek-Lipska, K., and Zhu, S.

Abstract

The neutron-deficient mercury isotopes, Hg-184,Hg-186, were studied with the recoil distance Doppler-shift method using the Gammasphere array and the Koln plunger device. The differential decay curve method was employed to determine the lifetimes of the yrast states in Hg-184,Hg-186. An improvement on previously measured values of yrast states up to 8(+) is presented as well as first values for the 9(3) state in Hg-184 and 10(+) state in 186Hg. B(E2) values are calculated and compared to a two-state mixing model which utilizes the variable moment of inertia model, allowing for extraction of spin-dependent mixing strengths and amplitudes.

Published
2014

23. Shape Coexistence in the Neutron- Deficient Even-Even Hg182-188 Isotopes Studied via Coulomb Excitation

Author

Bree, N., Wrzosek-Lipska, K., Petts, A., Andreyev, A., Bastin, B., Bender, M., Blazhev, A., Bruyneel, B., Butler, P. A., Butterworth, J., Carpenter, M. P., Cederkaell, J., Clement, E., Cocolios, T. E., Deacon, A., Diriken, J., Ekstroem, A., Fitzpatrick, C., Fraile, L. M., Fransen, Ch., Freeman, S. J., Gaffney, L. P., Garcia-Ramos, J. E., Geibel, K., Gernhaeuser, R., Grahn, T., Guttormsen, M., Hadinia, B., Hadynska-Klek, K., Hass, M., Heenen, P. -H., Herzberg, R. -D., Hess, H., Heyde, K., Huyse, M., Ivanov, O., Jenkins, D. G., Julin, R., Kesteloot, N., Kroell, Th., Kruecken, R., Larsen, A. C., Lutter, R., Marley, P., Napiorkowski, P. J., Orlandi, R., Page, R. D., Pakarinen, J., Patronis, N., Peura, P. J., Piselli, E., Rahkila, P., Rapisarda, E., Reiter, P., Robinson, A. P., Scheck, M., Siem, S., Chakkal, K. Singh, Smith, J. F., Srebrny, J., Stefanescu, I., Tveten, G. M., Van Duppen, P., de Walle, J. Van, Voulot, D., Warr, N., Wenander, F., Wiens, A., Wood, J. L., Zielinska, M., Bree, N., Wrzosek-Lipska, K., Petts, A., Andreyev, A., Bastin, B., Bender, M., Blazhev, A., Bruyneel, B., Butler, P. A., Butterworth, J., Carpenter, M. P., Cederkaell, J., Clement, E., Cocolios, T. E., Deacon, A., Diriken, J., Ekstroem, A., Fitzpatrick, C., Fraile, L. M., Fransen, Ch., Freeman, S. J., Gaffney, L. P., Garcia-Ramos, J. E., Geibel, K., Gernhaeuser, R., Grahn, T., Guttormsen, M., Hadinia, B., Hadynska-Klek, K., Hass, M., Heenen, P. -H., Herzberg, R. -D., Hess, H., Heyde, K., Huyse, M., Ivanov, O., Jenkins, D. G., Julin, R., Kesteloot, N., Kroell, Th., Kruecken, R., Larsen, A. C., Lutter, R., Marley, P., Napiorkowski, P. J., Orlandi, R., Page, R. D., Pakarinen, J., Patronis, N., Peura, P. J., Piselli, E., Rahkila, P., Rapisarda, E., Reiter, P., Robinson, A. P., Scheck, M., Siem, S., Chakkal, K. Singh, Smith, J. F., Srebrny, J., Stefanescu, I., Tveten, G. M., Van Duppen, P., de Walle, J. Van, Voulot, D., Warr, N., Wenander, F., Wiens, A., Wood, J. L., and Zielinska, M.

Abstract

Coulomb-excitation experiments to study electromagnetic properties of radioactive even-even Hg isotopes were performed with 2.85 MeV/nucleon mercury beams from REX-ISOLDE. Magnitudes and relative signs of the reduced E2 matrix elements that couple the ground state and low-lying excited states in Hg182-188 were extracted. Information on the deformation of the ground and the first excited 0(+) states was deduced using the quadrupole sum rules approach. Results show that the ground state is slightly deformed and of oblate nature, while a larger deformation for the excited 0(+) state was noted in Hg-182; 184. The results are compared to beyond mean field and interacting-boson based models and interpreted within a two-state mixing model. Partial agreement with the model calculations was obtained. The presence of two different structures in the light even-mass mercury isotopes that coexist at low excitation energy is firmly established.

Published
2014

24. Lifetime measurements probing triple shape coexistence in Au-175

Author

Watkins, H., Joss, D. T., Grahn, T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kroell, T., Kruecken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, T., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Saren, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., Venhart, M., Watkins, H., Joss, D. T., Grahn, T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kroell, T., Kruecken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, T., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Saren, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., and Venhart, M.

Abstract

Lifetimes of the low-lying excited states in the very neutron-deficient nucleus Au-175 have been measured by the recoil-distance Doppler-shift method using gamma-ray spectra obtained with the recoil-decay tagging technique. Transition quadrupole moments and reduced transition probabilities extracted for this odd-Z nucleus indicate the existence of three different shapes and the competition between collective and noncollective structures.

Published
2011

25. Competing quasiparticle configurations in W-163

Author

E. S. Paul, P. Rahkila, J. Simpson, Jan Sarén, David O'Donnell, S. Erturk, Paul Greenlees, Matti Leino, P. J. Sapple, M. B. Gomez-Hornillos, Juha Uusitalo, Janne Pakarinen, Peter M. Jones, R. D. Page, T. Grahn, Mikael Sandzelius, Steffen Ketelhut, C. Scholey, L. Bianco, N. Rowley, S. Eeckhaudt, Bo Cederwall, M. Nyman, J. Thomson, R. Julin, Juha Sorri, Baharak Hadinia, Iain Darby, S. Juutinen, D. T. Joss, Pakarinen, Janne -- 0000-0001-8944-8757, Darby, Iain -- 0000-0003-2091-2616, O'Donnell, David -- 0000-0002-4710-3803, Scholey, Catherine -- 0000-0002-8743-6071, Cederwall, Bo -- 0000-0003-1771-2656, Jones, Pete -- 0000-0001-7480-6603, Gomez Hornillos -- 0000-0002-9282-9195, Grahn, Tuomas -- 0000-0002-6255-2279, [Thomson, J. -- Joss, D. T. -- Paul, E. S. -- Bianco, L. -- Darby, I. G. -- Grahn, T. -- Page, R. D. -- Pakarinen, J. -- Sapple, P. J.] Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England -- [Scholey, C. -- Eeckhaudt, S. -- Greenlees, P. T. -- Jones, P. -- Julin, R. -- Juutinen, S. -- Leino, M. -- Nyman, M. -- Rahkila, P. -- Sandzelius, M. -- Saren, J. -- Sorri, J. -- Uusitalo, J.] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland -- [Simpson, J. -- Gomez-Hornillos, M. B. -- O'Donnell, D. -- Rowley, N.] STFC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England -- [Erturk, S.] Nigde Univ, Fen Edebiyat Fak, Fizik Bolumu, TR-51100 Nigde, Turkey -- [Cederwall, B. -- Hadinia, B. -- Sandzelius, M.] Royal Inst Technol, Dept Phys, S-10691 Stockholm, Sweden, and 0-Belirlenecek

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Neutron emission, Stable isotope ratio, Excited state, Quasiparticle, Parity (physics), Nuclide, Atomic physics, 0-Belirlenecek, Radioactive decay
Abstract

WOS: 000274002700019, Excited states in the neutron-deficient nuclide W-163 were investigated using the Cd-106(Ni-60, 2pn)W-163 reaction at a beam energy of 270 MeV. The level scheme for W-163 was extended significantly with the observation of five new band structures. The yrast band based on a 13/2(+) isomeric state is extended up to (57/2(+)). Two band structures were established on the 7/2(-) ground state. Quasiparticle configuration assignments for the new band structures were made on the basis of cranked Woods-Saxon shell-model calculations. The results reported in this article suggest that the negative-parity nu(f(7/2), h(9/2)) orbitals are responsible for the first rotational alignment in the yrast band., UK Science and Technology Facilities Council (STFC); EU [506065]; Academy of Finland; Swedish Research Council [111965]; C. S. [209430]; Science and Technology Facilities Council [EP/C015266/1, EP/C015371/1, ST/G008620/1, ST/J000108/1, ST/F012039/1, EP/C543157/1, ST/G008671/1], Financial support for this work has been provided by the UK Science and Technology Facilities Council (STFC), the EU sixth Framework Programme, Integrating Infrastructure Initiative-Transnational Access, (EURONS, Contract No. 506065), the Academy of Finland under the Finnish Centre of Excellence Programme 2006-2011, and by the Swedish Research Council. P. T. G. (Contract No. 111965) and C. S. (Contract No. 209430) acknowledge the support of the Academy of Finland. We thank the UK/France (STFC/IN2P3) Loan Pool and the GAMMAPOOL European Spectroscopy Resource for the loan of detectors for JUROGAM and GSI for the loan of the VEGA detectors. The authors express their gratitude to the staff of the Accelerator Laboratory at the University of Jyvaskyla a for their excellent technical support. The authors also thank Paul Morrall of Daresbury Laboratory for preparation of the Cd targets.

Published
2010

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