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1. 133In: A Rosetta Stone for decays of r-process nuclei

Author

Xu, Z. Y., Madurga, M., Grzywacz, R., King, T. T., Algora, A., Andreyev, A. N., Benito, J., Berry, T., Borge, M. J. G., Costache, C., De Witte, H., Fijalkowska, A., Fraile, L. M., Fynbo, H. O. U., Gottardo, A., Halverson, C., Harkness-Brennan, L. J., Heideman, J., Huyse, M., Illana, A., Janiak, Ł., Judson, D. S., Korgul, A., Kurtukian-Nieto, T., Lazarus, I., Lică, R., Lozeva, R., Marginean, N., Marginean, R., Mazzocchi, C., Mihai, C., Mihai, R. E., Morales, A. I., Page, R. D., Pakarinen, J., Piersa-Siłkowska, M., Podolyák, Zs., Sarriguren, P., Singh, M., Sotty, Ch., Stepaniuk, M., Tengblad, O., Turturica, A., Van Duppen, P., Vedia, V., Viñals, S., Warr, N., Yokoyama, R., and Yuan, C. X.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The $\beta$ decays from both the ground state and a long-lived isomer of $^{133}$In were studied at the ISOLDE Decay Station (IDS). With a hybrid detection system sensitive to $\beta$, $\gamma$, and neutron spectroscopy, the comparative partial half-lives (logft) have been measured for all their dominant $\beta$-decay channels for the first time, including a low-energy Gamow-Teller transition and several First-Forbidden (FF) transitions. Uniquely for such a heavy neutron-rich nucleus, their $\beta$ decays selectively populate only a few isolated neutron unbound states in $^{133}$Sn. Precise energy and branching-ratio measurements of those resonances allow us to benchmark $\beta$-decay theories at an unprecedented level in this region of the nuclear chart. The results show good agreement with the newly developed large-scale shell model (LSSM) calculations. The experimental findings establish an archetype for the $\beta$ decay of neutron-rich nuclei southeast of $^{132}$Sn and will serve as a guide for future theoretical development aiming to describe accurately the key $\beta$ decays in the rapid-neutron capture (r-) process.

Published
2023
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2. Beta-delayed neutron spectroscopy of $^{133}$In

Author

Xu, Z. Y., Madurga, M., Grzywacz, R., King, T. T., Algora, A., Andreyev, A. N., Benito, J., Berry, T., Borge, M. J. G., Costache, C., De Witte, H., Fijalkowska, A., Fraile, L. M., Fynbo, H. O. U., Gottardo, A., Halverson, C., Harkness-Brennan, L. J., Heideman, J., Huyse, M., Illana, A., Janiak, Ł., Judson, D. S., Korgul, A., Kurtukian-Nieto, T., Lazarus, I., Lică, R., Lozeva, R., Marginean, N., Marginean, R., Mazzocchi, C., Mihai, C., Mihai, R. E., Morales, A. I., Page, R. D., Pakarinen, J., Piersa-Siłkowska, M., Podolyák, Zs., Sarriguren, P., Singh, M., Sotty, Ch., Stepaniuk, M., Tengblad, O., Turturica, A., Van Duppen, P., Vedia, V., Viñals, S., Warr, N., Yokoyama, R., and Yuan, C. X.

Subjects
Nuclear Experiment
Abstract

The decay properties of $^{133}$In were studied in detail at the ISOLDE Decay Station (IDS). The implementation of the Resonance Ionization Laser Ion Source (RILIS) allowed separate measurements of its $9/2^+$ ground state ($^{133g}$In) and $1/2^-$ isomer ($^{133m}$In). With the use of $\beta$-delayed neutron and $\gamma$ spectroscopy, the decay strengths above the neutron separation energy were quantified in this neutron-rich nucleus for the first time. The allowed Gamow-Teller transition $9/2^+\rightarrow7/2^+$ was located at 5.92 MeV in the $^{133g}$In decay with a logft = 4.7(1). In addition, several neutron-unbound states were populated at lower excitation energies by the First-Forbidden decays of $^{133g,m}$In. We assigned spins and parities to those neutron-unbound states based on the $\beta$-decay selection rules, the logft values, and systematics.

Published
2023
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3. Detailed spectroscopy of doubly magic $^{132}$Sn

Author

Benito, J., Fraile, L. M., Korgul, A., Piersa, M., Adamska, E., Andreyev, A. N., Álvarez-Rodríguez, 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., Fernández-Martínez, G., Fijałkowska, A., Fila, M., Fynbo, H., Galaviz, D., Galve, P., García-Díez, M., Greenlees, P. T., Grzywacz, R., Harkness-Brennan, L. J., Henrich, C., Huyse, M., Ibáñez, P., Illana, A., Janas, Z., Jolie, J., Judson, D. S., Karayonchev, V., Kicinska-Habior, M., Konki, J., Kurcewicz, J., Lazarus, I., Lica, R., López-Montes, A., Lund, M., Mach, H., Madurga, M., Marroquín, I., Marsh, B., Martínez, M. C., Mazzocchi, C., Marginean, N., Marginean, R., Miernik, K., Mihai, C., Mihai, R. E., Nácher, E., Negret, A., Olaizola, B., Page, R. D., Paulauskas, S. V., Pascu, S., Perea, A., Pucknell, V., Rahkila, P., Raison, C., Rapisarda, E., Régis, J. -M., Rezynkina, K., Rotaru, F., Rothe, S., Sánchez-Parcerisa, D., Sánchez-Tembleque, V., Schomacker, K., Simpson, G. S., Sotty, Ch., Stan, L., Stanoiu, M., Stryjczyk, M., Tengblad, O., Turturica, A., Udías, J. M., Van Duppen, P., Vedia, V., Villa-Abaunza, A., Viñals, S., Walters, W. B., Wadsworth, R., and Warr, N.

Subjects
Nuclear Experiment
Abstract

The structure of the doubly magic $^{132}_{50}$Sn$_{82}$ has been investigated at the ISOLDE facility at CERN, populated both by the $\beta^-$decay of $^{132}$In and $\beta^-$-delayed neutron emission of $^{133}$In. The level scheme of $^{132}$Sn 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 $^{133}$In. Improved delayed neutron emission probabilities are obtained both for $^{132}$In and $^{133}$In. 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 \textit{N} = 82 and \textit{Z} = 50 shells, leading to positive and negative parity particle-hole multiplets. The experimental information provides new data to challenge the theoretical description of $^{132}$Sn., Comment: 19 pages, 11 figures. Accepted for publication in Phys. Rev. C

Published
2020
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4. Decay studies of the long-lived states in $^{186}$Tl

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., Podolyák, Zs., Pucknell, V., Rapisarda, E., Rotaru, F., Sotty, Ch., Tengblad, O., Vedia, V., Viñals, S., Wadsworth, R., Warr, N., and Wrzosek-Lipska, K.

Subjects
Nuclear Experiment
Abstract

Decay spectroscopy of the long-lived states in $^{186}$Tl has been performed at the ISOLDE Decay Station at ISOLDE, CERN. The $\alpha$ decay from the low-spin $(2^-)$ state in $^{186}$Tl was observed for the first time and a half-life of $3.4^{+0.5}_{-0.4}$ 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 $^{186}$Tl($10^{(-)}$) 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 $^{184}$Tl and $^{186}$Tl., Comment: 10 pages, 12 figures

Published
2020
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5. β -delayed neutron spectroscopy of In133

Author

Xu, Z. Y., primary, Madurga, M., additional, Grzywacz, R., additional, King, T. T., additional, Algora, A., additional, Andreyev, A. N., additional, Benito, J., additional, Berry, T., additional, Borge, M. J. G., additional, Costache, C., additional, De Witte, H., additional, Fijalkowska, A., additional, Fraile, L. M., additional, Fynbo, H. O. U., additional, Gottardo, A., additional, Halverson, C., additional, Harkness-Brennan, L. J., additional, Heideman, J., additional, Huyse, M., additional, Illana, A., additional, Janiak, Ł., additional, Judson, D. S., additional, Korgul, A., additional, Kurtukian-Nieto, T., additional, Lazarus, I., additional, Lică, R., additional, Lozeva, R., additional, Marginean, N., additional, Marginean, R., additional, Mazzocchi, C., additional, Mihai, C., additional, Mihai, R. E., additional, Morales, A. I., additional, Page, R. D., additional, Pakarinen, J., additional, Piersa-Siłkowska, M., additional, Podolyák, Zs., additional, Sarriguren, P., additional, Singh, M., additional, Sotty, Ch., additional, Stepaniuk, M., additional, Tengblad, O., additional, Turturica, A., additional, Van Duppen, P., additional, Vedia, V., additional, Viñals, S., additional, Warr, N., additional, Yokoyama, R., additional, and Yuan, C. X., additional

Published
2023
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6. In133 : A Rosetta Stone for Decays of r -Process Nuclei

Author

Xu, Z. Y., primary, Madurga, M., additional, Grzywacz, R., additional, King, T. T., additional, Algora, A., additional, Andreyev, A. N., additional, Benito, J., additional, Berry, T., additional, Borge, M. J. G., additional, Costache, C., additional, De Witte, H., additional, Fijalkowska, A., additional, Fraile, L. M., additional, Fynbo, H. O. U., additional, Gottardo, A., additional, Halverson, C., additional, Harkness-Brennan, L. J., additional, Heideman, J., additional, Huyse, M., additional, Illana, A., additional, Janiak, Ł., additional, Judson, D. S., additional, Korgul, A., additional, Kurtukian-Nieto, T., additional, Lazarus, I., additional, Lică, R., additional, Lozeva, R., additional, Marginean, N., additional, Marginean, R., additional, Mazzocchi, C., additional, Mihai, C., additional, Mihai, R. E., additional, Morales, A. I., additional, Page, R. D., additional, Pakarinen, J., additional, Piersa-Siłkowska, M., additional, Podolyák, Zs., additional, Sarriguren, P., additional, Singh, M., additional, Sotty, Ch., additional, Stepaniuk, M., additional, Tengblad, O., additional, Turturica, A., additional, Van Duppen, P., additional, Vedia, V., additional, Viñals, S., additional, Warr, N., additional, Yokoyama, R., additional, and Yuan, C. X., additional

Published
2023
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7. 133In: A Rosetta Stone for decays of r-process nuclei

Author

Xu, Z.Y., Madurga, M., Grzywacz, R., King, T.T., Algora, A., Andreyev, A.N., Benito, J., Berry, T., Borge, M.J.G., Costache, C., De Witte, H., Fijalkowska, A., Fraile, L.M., Fynbo, H.O.U., Gottardo, A., Halverson, C., Harkness-Brennan, L.J., Heideman, J., Huyse, M., Illana, A., Janiak, Ł., Judson, D.S., Korgul, A., Kurtukian-Nieto, T., Lazarus, I., Lică, R., Lozeva, R., Marginean, N., Marginean, R., Mazzocchi, C., Mihai, C., Mihai, R.E., Morales, A.I., Page, R.D., Pakarinen, J., Piersa-Siłkowska, M., Podolyák, Zs., Sarriguren, P., Singh, M., Sotty, Ch., Stepaniuk, M., Tengblad, O., Turturica, A., Van Duppen, P., Vedia, V., Viñals, S., Warr, N., Yokoyama, R., and Yuan, C.X.

Subjects
Nuclear Theory (nucl-th), nucl-th, Nuclear Theory, Nuclear Physics - Theory, FOS: Physical sciences, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), nucl-ex, Nuclear Experiment
Abstract

The β decays from both the ground state and a long-lived isomer of In133 were studied at the ISOLDE Decay Station (IDS). With a hybrid detection system sensitive to β, γ, and neutron spectroscopy, the comparative partial half-lives (logft) have been measured for all their dominant β-decay channels for the first time, including a low-energy Gamow-Teller transition and several first-forbidden (FF) transitions. Uniquely for such a heavy neutron-rich nucleus, their β decays selectively populate only a few isolated neutron unbound states in Sn133. Precise energy and branching-ratio measurements of those resonances allow us to benchmark β-decay theories at an unprecedented level in this region of the nuclear chart. The results show good agreement with the newly developed large-scale shell model (LSSM) calculations. The experimental findings establish an archetype for the β decay of neutron-rich nuclei southeast of Sn132 and will serve as a guide for future theoretical development aiming to describe accurately the key β decays in the rapid-neutron capture (r-) process. The $\beta$ decays from both the ground state and a long-lived isomer of $^{133}$In were studied at the ISOLDE Decay Station (IDS). With a hybrid detection system sensitive to $\beta$, $\gamma$, and neutron spectroscopy, the comparative partial half-lives (logft) have been measured for all their dominant $\beta$-decay channels for the first time, including a low-energy Gamow-Teller transition and several First-Forbidden (FF) transitions. Uniquely for such a heavy neutron-rich nucleus, their $\beta$ decays selectively populate only a few isolated neutron unbound states in $^{133}$Sn. Precise energy and branching-ratio measurements of those resonances allow us to benchmark $\beta$-decay theories at an unprecedented level in this region of the nuclear chart. The results show good agreement with the newly developed large-scale shell model (LSSM) calculations. The experimental findings establish an archetype for the $\beta$ decay of neutron-rich nuclei southeast of $^{132}$Sn and will serve as a guide for future theoretical development aiming to describe accurately the key $\beta$ decays in the rapid-neutron capture (r-) process.

Published
2023

8. Competition between allowed and first-forbidden beta decays of At-208 and expansion of the Po-208 level scheme

Author

Brunet, M, Podolyak, Zs, Berry, TA, Brown, BA, Carroll, RJ, Lica, R, Sotty, Ch, Andreyev, AN, Borge, MJG, Cubiss, JG, Fraile, LM, Fynbo, HOU, Gamba, E, Greenlees, P, Harkness-Brennan, LJ, Huyse, M, Judson, DS, Konki, J, Kurcewicz, J, Lazarus, I, Madurga, M, Marginean, N, Marginean, R, Marroquin, I, Mihai, C, Nacher, E, Negret, A, Pascu, S, Page, RD, Perea, A, Phrompao, J, Piersa, M, Pucknell, V, Rahkila, P, Rapisarda, E, Regan, PH, Rotaru, F, Rudigier, M, Shand, CM, Shearman, R, Simpson, EC, Stora, T, Tengblad, O, Van Duppen, P, Vedia, V, Vinals, S, Wadsworth, R, Warr, N, and De Witte, H

Subjects
Science & Technology, Physics, Nuclear, NUCLEAR-DATA SHEETS, STATES, Physics, Physical Sciences, TRANSITION
Abstract

ispartof: PHYSICAL REVIEW C vol:103 issue:5 status: published

Published
2021

9. Competition between allowed and first-forbidden β decays of at 208 and expansion of the Po 208 level scheme

Author

Brunet, M., Podolyák, Zs, Berry, T. A., Brown, B. A., Carroll, R. J., Lica, R., Sotty, Ch, Andreyev, A. N., Borge, M. J.G., Cubiss, J. G., Fraile, L. M., Fynbo, H. O.U., Gamba, E., Greenlees, P., Harkness-Brennan, L. J., Huyse, M., Judson, D. S., Konki, J., Kurcewicz, J., Lazarus, I., Madurga, M., Marginean, N., Marginean, R., Marroquin, I., Mihai, C., Nácher, E., Negret, A., Pascu, S., Page, R. D., 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., Stora, T., Tengblad, O., Van Duppen, P., Vedia, V., Vinals, S., Wadsworth, R., Warr, N., De Witte, H., European Commission, Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Research Foundation - Flanders, KU Leuven, Belgian Science Policy Office, National Science Centre (Poland), National Science Foundation (US), Department for Business, Energy and Industrial Strategy (UK), and National Measurement Office (UK)

Abstract

13 pags., 5 figs., 2 tabs., The structure of Po208 populated through the EC/β+ decay of At208 is investigated using γ-ray spectroscopy at the ISOLDE Decay Station. The presented level scheme contains 27 new excited states and 43 new transitions, as well as a further 50 previously observed γ rays which have been (re)assigned a position. The level scheme is compared to shell model calculations. Through this analysis approximately half of the β-decay strength of At208 is found to proceed via allowed decay and half via first-forbidden decay. The first-forbidden transitions predominantly populate core excited states at high excitation energies, which is qualitatively understood using shell model considerations. This mass region provides an excellent testing ground for the competition between allowed and first-forbidden β-decay calculations, important for the detailed understanding of the nucleosynthesis of heavy elements., The research leading to these results received funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 654002. Support from the European Union Seventh Framework through ENSAR Contract No. 262010, as well as the Science and Technology Facilities Council (U.K.) through Grants No. ST/P005314/1, No. ST/L005743/1, No. ST/J000051/1, No. ST/L005670/1, and No. ST/P004598/1, the German BMBF under Contract No. 05P18PKCIA and “Verbundprojekt 05P2018” as well as Spanish MINECO Grants No. FPA2015-65035- P and No. FPA2017-87568-P, FWO Vlaanderen (Belgium), GOA/2015/010 (BOF KU Leuven), the Excellence of Science Programme (EOS-FWO), the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office (BriX network P7/12), the Polish National Science Centre under Contracts No. UMO-2015/18/M/ST2/00523 and No. UMO-2019/33/N/ST2/03023, National Science Foundation (U.S.) Grant No. PHY1811855, and the Romanian IFA project CERN-RO/ISOLDE is acknowledged. P.H.R. acknowledges support from the U.K. Department for Business, Energy and Industrial Strategy via the National Measurement Office

Published
2021

10. Competition between allowed and first-forbidden β decays of At208 and expansion of the Po208 level scheme

Author

Brunet, M., Podolyák, Zs., Berry, T. A., Brown, B. A., Carroll, R. J., Lica, R., Sotty, Ch., Andreyev, A. N., Borge, M. J. G., Cubiss, J. G., Fraile, L. M., Fynbo, H. O. U., Gamba, E., Greenlees, P., Harkness-Brennan, L. J., Huyse, M., Judson, D. S., Konki, J., Kurcewicz, J., Lazarus, I., Madurga, M., Marginean, N., Marginean, R., Marroquin, I., Mihai, C., Nácher, E., Negret, A., Pascu, S., Page, R. D., 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., Stora, T., Tengblad, O., Van Duppen, P., Vedia, V., Vinals, S., Wadsworth, R., Warr, N., and De Witte, H.

Subjects
electromagnetic transitions, beta decay, fysiikka, nuclear structure and decays
Abstract

The structure of 208Po populated through the EC/β+ decay of 208At is investigated using γ-ray spectroscopy at the ISOLDE Decay Station. The presented level scheme contains 27 new excited states and 43 new transitions, as well as a further 50 previously observed γ rays which have been (re)assigned a position. The level scheme is compared to shell model calculations. Through this analysis approximately half of the β-decay strength of 208At is found to proceed via allowed decay and half via first-forbidden decay. The first-forbidden transitions predominantly populate core excited states at high excitation energies, which is qualitatively understood using shell model considerations. This mass region provides an excellent testing ground for the competition between allowed and first-forbidden β-decay calculations, important for the detailed understanding of the nucleosynthesis of heavy elements. peerReviewed

Published
2021

11. 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

12. 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

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

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, Zsolt, Pucknell, V., Rapisarda, E., Rotaru, F., Sotty, Ch., Tengblad, O., Vedia, V., Vinals, S., Wadsworth, R., Warr, N., and Wrzosek-Lipska, K.

Subjects
Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Decay spectroscopy of the long-lived states in 186Tl has been performed at the ISOLDE Decay Station at ISOLDE, CERN. The � decay from the low-spin (2

Published
2020

14. 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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15. 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

16. Competition between allowed and first-forbidden β decays of At208 and expansion of the Po208 level scheme

Author

Brunet, M., primary, Podolyák, Zs., additional, Berry, T. A., additional, Brown, B. A., additional, Carroll, R. J., additional, Lica, R., additional, Sotty, Ch., additional, Andreyev, A. N., additional, Borge, M. J. G., additional, Cubiss, J. G., additional, Fraile, L. M., additional, Fynbo, H. O. U., additional, Gamba, E., additional, Greenlees, P., additional, Harkness-Brennan, L. J., additional, Huyse, M., additional, Judson, D. S., additional, Konki, J., additional, Kurcewicz, J., additional, Lazarus, I., additional, Madurga, M., additional, Marginean, N., additional, Marginean, R., additional, Marroquin, I., additional, Mihai, C., additional, Nácher, E., additional, Negret, A., additional, Pascu, S., additional, Page, R. D., additional, Perea, A., additional, Phrompao, J., additional, Piersa, M., additional, Pucknell, V., additional, Rahkila, P., additional, Rapisarda, E., additional, Regan, P. H., additional, Rotaru, F., additional, Rudigier, M., additional, Shand, C. M., additional, Shearman, R., additional, Simpson, E. C., additional, Stora, T., additional, Tengblad, O., additional, Van Duppen, P., additional, Vedia, V., additional, Vinals, S., additional, Wadsworth, R., additional, Warr, N., additional, and De Witte, H., additional

Published
2021
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17. 208Po populated through EC/β+ decay

Author

Brunet, M., primary, Berry, T.A., additional, Podolyák, Zs., additional, Carroll, R. J., additional, Lica, R., additional, Sotty, Ch., additional, Andreyev, A. N., additional, Borge, M. J. G., additional, Cubiss, J. G., additional, Fraile, L. M., additional, Fynbo, H. O. U., additional, Gamba, E., additional, Greenless, P., additional, Harkness-Brennan, L.J., additional, Huyse, M., additional, Judson, D. S., additional, Konki, J., additional, Kurcewicz, J., additional, Lazarus, I., additional, Madurga, M., additional, Marginean, N., additional, Marginean, R., additional, Marroquin, I., additional, Mihai, C., additional, Nácher, E., additional, Negret, A., additional, Pascu, S., additional, Page, R. D., additional, Perea, A., additional, Phrompao, J., additional, Piersa, M., additional, Pucknell, V., additional, Rahkila, P., additional, Rapisarda, E., additional, Regan, P. H., additional, Rotaru, F., additional, Rudigier, M., additional, Shand, C. M., additional, Shearman, R., additional, Simpson, E. C., additional, Stora, T., additional, Tengblad, O., additional, Duppen, P. Van, additional, Vedia, V., additional, Vinals, S., additional, Wadsworth, R., additional, Warr, N., additional, and De Witte, H., additional

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

Author

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

Published
2020
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19. Octupole states in Tl207 studied through β decay

Author

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

Published
2020
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20. 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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21. (208)po populated through EC/beta(+) decay

Author

Brunet, M, Berry, TA, Podolyak, Zs, Carroll, RJ, Lica, R, Sotty, Ch, Andreyev, AN, Borge, MJG, Cubiss, JG, Fraile, LM, Fynbo, HOU, Gamba, E, Greenless, P, Harkness-Brennan, LJ, Huyse, M, Judson, DS, Konki, J, Kurcewicz, J, Lazarus, I, Madurga, M, Marginean, N, Marginean, R, Marroquin, I, Mihai, C, Nacher, E, Negret, A, Pascu, S, Page, RD, Perea, A, Phrompao, J, Piersa, M, Pucknell, V, Rahkila, P, Rapisarda, E, Regan, PH, Rotaru, F, Rudigier, M, Shand, CM, Shearman, R, Simpson, EC, Stora, T, Tengblad, O, Van Duppen, P, Vedia, V, Vinals, S, Wadsworth, R, Warr, N, De Witte, H, Publishing, IOP, European Commission, Science and Technology Facilities Council (UK), National Measurement System (UK), Federal Ministry of Education and Research (Germany), and Ministerio de Economía y Competitividad (España)

Subjects
History, Horizon (archaeology), 010308 nuclear & particles physics, Industrial strategy, 01 natural sciences, language.human_language, Computer Science Applications, Education, German, Political science, 0103 physical sciences, language, Economic history, media_common.cataloged_instance, Física nuclear, Nuclear Physics - Experiment, European union, 010306 general physics, ydinfysiikka, polonium, media_common
Abstract

The structure of 208Po resulting from the EC/β + decay of 208At was studied at CERN’s ISOLDE Decay Station (IDS). The high statistics afforded by the high yield of 208At and the high efficiency HPGe clusters at the IDS allowed for greater insight into lower intensity transitions and thus significant expansion of the 208Po level scheme. Furthermore, investigation into the isomeric state yielded a new half life 377(9) ns in addition to uncovering new transitions populating the state., The research leading to these results has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 654002. As well as the Science and Technology Facilities Council (UK) through grants ST/P005314/1, ST/L005743/1, ST/J000051/1, ST/L005670/1, and ST/P004598/1 and (PHR) by the UK Department of Business, Energy and Industrial Strategy (BEIS) via the National Measurement System. Further funding was provided by the German BMBF under contract 05P18PKCIA and ”Verbundprojekt 05P2018” as well as the Spanish MINECO grant FPA2015-65035-P.

Published
2020

22. 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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23. 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

24. 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

25. 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

26. 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

27. 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

28. $\beta$ decay of $^{133}\mathrm{In}$: $\gamma$ emission from neutron-unbound states in $^{133}\mathrm{Sn}$

Author

Piersa, M., Korgul, A., Fraile, L.M., Benito, J., Adamska, E., Andreyev, A.N., Álvarez-Rodríguez, R., Barzakh, A.E., Benzoni, G., Berry, T., Borge, M.J.G., Carmona, M., Chrysalidis, K., Correia, J.G., Costache, C., Cubiss, J.G., Day Goodacre, T., De Witte, H., Fedorov, D.V., Fedosseev, V.N., Fernández-Martínez, G., Fijałkowska, 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., Kicińska-Habior, M., Konki, J., Kurcewicz, J., Lazarus, I., Lică, R., Mach, H., Madurga, M., Marroquín, I., Marsh, B., Martínez, M.C., Mazzocchi, C., Mărginean, N., Mărginean, R., Miernik, K., Mihai, C., Nácher, E., Negret, A., Olaizola, B., Page, R.D., Paulaskalas, S., Pascu, S., Perea, A., Pucknell, V., Rahkila, P., Rapisarda, E., Régis, J.M., Rotaru, F., Rothe, S., Sánchez-Tembleque, V., Simpson, G., Sotty, Ch., Stan, L., Stănoiu, M., Stryjczyk, M., Tengblad, O., Turturica, A., Udías, J.M., Van Duppen, P., Vedia, V., Villa, A., Viñals, S., Wadsworth, R., Walters, W.B., Warr, N., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), IDS, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)

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

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

Published
2019
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29. 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

30. 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

31. 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

32. INVESTIGATION OF LOW-LYING STATES IN Sn-133 POPULATED IN THE beta DECAY OF In-133 USING ISOMER-SELECTIVE LASER IONIZATION

Author

Piersa, M., Korgul, A., Fraile, L. M., Benito, J., Adamska, E., Alvarez, R., Barzakh, A. E., Benzoni, G., Berry, T., Borge, M. J. G., Carmona, M., Chrysalidis, K., Correia, G., Costache, C., Goodacre, T. Day, Fedorov, D. V., Fedosseev, V. N., Fernandez-Martinez, G., Fila, M., Galaviz, D., Grzywacz, R., Henrich, C., Illana, A., Janas, Z., Johnston, K., Karanyonchev, V., Kicinska-Habior, M., Lica, R., Madurga, M., Marroquin, I., Marsh, B., Martinez, C., Mazzocchi, C., Miernik, K., Mihai, R., Olaizola, B., Paulaskalas, S., Regis, J-M, Rothe, S., Sanchez-Tembleque, V., Simpson, G., Sotty, Ch., Stan, L., Stanoiu, M., Stryjczyk, M., Turturica, A., Udias, J. M., Vedia, V., Villa, A., Walters, W. B., Piersa, M., Korgul, A., Fraile, L. M., Benito, J., Adamska, E., Alvarez, R., Barzakh, A. E., Benzoni, G., Berry, T., Borge, M. J. G., Carmona, M., Chrysalidis, K., Correia, G., Costache, C., Goodacre, T. Day, Fedorov, D. V., Fedosseev, V. N., Fernandez-Martinez, G., Fila, M., Galaviz, D., Grzywacz, R., Henrich, C., Illana, A., Janas, Z., Johnston, K., Karanyonchev, V., Kicinska-Habior, M., Lica, R., Madurga, M., Marroquin, I., Marsh, B., Martinez, C., Mazzocchi, C., Miernik, K., Mihai, R., Olaizola, B., Paulaskalas, S., Regis, J-M, Rothe, S., Sanchez-Tembleque, V., Simpson, G., Sotty, Ch., Stan, L., Stanoiu, M., Stryjczyk, M., Turturica, A., Udias, J. M., Vedia, V., Villa, A., and Walters, W. B.

Abstract

Excited states in the neutron-rich isotope Sn-133 were studied via the beta decay of In-133. Isomer selective ionization using the ISOLDE RILIS enabled the beta decays of In-133(gs) (I-pi = 9/2(+)) and In-133m (I-pi = 1/2(-)) to be studied independently for the first time. A description of the experimental setup at the ISOLDE Decay Station is presented together with preliminary results from the experiment.

Published
2018

33. Investigation of low-lying states in 133sn populated in the - Decay of 133in using isomer-selective laser ionization

Author

National Science Centre (Poland), Fundação para a Ciência e a Tecnologia (Portugal), SCOAP, Ministerio de Economía y Competitividad (España), Piersa, M., Korgul, A., Fraile, Luis M., Benito, J., Adamska, E., Álvarez, R., Barzakh, A.E., Benzoni, G., Berry, T., García Borge, María José, Carmona, M., Chrysalidis, K., Correia, G., Costache, C., Day Goodacre, T., Fedorov, D.V., Fedosseev, V.N., Fernández-Martínez, G., Fila, M., Galaviz, D., Grzywacz, R., Henrich, C., Illana, A., Janas, A., Johnston, K., Karanyonchev, V., Kicinska-Habior, M., Lică, R., Madurga, Miguel, Marroquín, I., Marsh, B., Martínez, C., Mazzocchi, C., Miernik, K., Mihai, R., Olaizola, B., Paulaskalas, S., Régis, J.-M., Rothe, S., Sánchez-Tembleque, V., Simpson, G., Sotty, Ch., Stan, L., Stanoiu, M., Stryjczyk, M., Turturica, A., Udías, J. M., Vedia, V., Villa, A., Walters, W. B., National Science Centre (Poland), Fundação para a Ciência e a Tecnologia (Portugal), SCOAP, Ministerio de Economía y Competitividad (España), Piersa, M., Korgul, A., Fraile, Luis M., Benito, J., Adamska, E., Álvarez, R., Barzakh, A.E., Benzoni, G., Berry, T., García Borge, María José, Carmona, M., Chrysalidis, K., Correia, G., Costache, C., Day Goodacre, T., Fedorov, D.V., Fedosseev, V.N., Fernández-Martínez, G., Fila, M., Galaviz, D., Grzywacz, R., Henrich, C., Illana, A., Janas, A., Johnston, K., Karanyonchev, V., Kicinska-Habior, M., Lică, R., Madurga, Miguel, Marroquín, I., Marsh, B., Martínez, C., Mazzocchi, C., Miernik, K., Mihai, R., Olaizola, B., Paulaskalas, S., Régis, J.-M., Rothe, S., Sánchez-Tembleque, V., Simpson, G., Sotty, Ch., Stan, L., Stanoiu, M., Stryjczyk, M., Turturica, A., Udías, J. M., Vedia, V., Villa, A., and Walters, W. B.

Abstract

Excited states in the neutron-rich isotope 133Sn were studied via the ß decay of 133In. Isomer selective ionization using the ISOLDE RILIS enabled the ß decays of 133Ings (I¿ = 9=2+) and 133mIn (II¿ = 1=2-) to be studied independently for the first time. A description of the experimental setup at the ISOLDE Decay Station is presented together with preliminary results from the experiment.

Published
2018

34. Investigation of Low-lying States in $^{133}$Sn Populated in the $\beta $ Decay of $^{133}$In Using Isomer-selective Laser Ionization

Author

Piersa, M., primary, Korgul, A., additional, Fraile, L.M., additional, Benito, J., additional, Adamska, E., additional, Álvarez, R., additional, Barzakh, A.E., additional, Benzoni, G., additional, Berry, T., additional, Borge, M.J.G., additional, Carmona, M., additional, Chrysalidis, K., additional, Correia, G., additional, Costache, C., additional, Day Goodacre, T., additional, Fedorov, D.V., additional, Fedosseev, V.N., additional, Fernández-Martínez, G., additional, Fila, M., additional, Galaviz, D., additional, Grzywacz, R., additional, Henrich, C., additional, Illana, A., additional, Janas, Z., additional, Johnston, K., additional, Karanyonchev, V., additional, Kicińska-Habior, M., additional, Lică, R., additional, Madurga, M., additional, Marroquín, I., additional, Marsh, B., additional, Martínez, C., additional, Mazzocchi, C., additional, Miernik, K., additional, Mihai, R., additional, Olaizola, B., additional, Paulaskalas, S., additional, Régis, J.-M., additional, Rothe, S., additional, Sánchez-Tembleque, V., additional, Simpson, G., additional, Sotty, Ch., additional, Stan, L., additional, Stănoiu, M., additional, Stryjczyk, M., additional, Turturica, A., additional, Udías, J.M., additional, Vedia, V., additional, Villa, A., additional, and Walters, W.B., additional

Published
2018
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35. β decay of In 133 : γ emission from neutron-unbound states in Sn 133

Author

Piersa, M., Korgul, A., Fraile, L. M., Benito, J., Adamska, E., Andreyev, A. N., Álvarez-Rodríguez, R., Barzakh, A. E., Benzoni, G., Berry, T., Borge, M. J. G., Carmona, M., Chrysalidis, K., Correia, J. G., Costache, C., Cubiss, J. G., Day Goodacre, T., De Witte, H., Fedorov, D. V., Fedosseev, V. N., Fernández-Martínez, G., Fijałkowska, 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., Kicińska-Habior, M., Konki, J., Kurcewicz, J., Lazarus, I., Lică, R., Mach, H., Madurga, M., Marroquín, I., Marsh, B., Martínez, M. C., Mazzocchi, C., Mărginean, N., Mărginean, R., Miernik, K., Mihai, C., Nácher, E., Negret, A., Olaizola, B., Page, R. D., Paulaskalas, S., Pascu, S., Perea, A., Pucknell, V., Rahkila, P., Rapisarda, E., Régis, J.-M., Rotaru, F., Rothe, S., Sánchez-Tembleque, V., Simpson, G., Sotty, Ch., Stan, L., Stănoiu, M., Stryjczyk, M., Tengblad, O., Turturica, A., Udías, J. M., Van Duppen, P., Vedia, V., Villa, A., Viñals, S., Wadsworth, R., Walters, W. B., and Warr, N.

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36. Compound-Nucleus and Doorway-State Decays of β-Delayed Neutron Emitters ^{51,52,53}K.

Author

Xu ZY, Grzywacz R, Gottardo A, Madurga M, Alonso IM, Andreyev AN, Benzoni G, Borge MJG, Cap T, Costache C, De Witte H, Dimitrov BI, Escher JE, Fijalkowska A, Fraile LM, Franchoo S, Fynbo HOU, Gonsalves BC, Gross CJ, Harkness-Brennan LJ, Heideman J, Huyse M, Judson DS, Kawano T, King TT, Kisyov S, Kolos K, Korgul A, Lazarus I, Lică R, Liu ML, Lynch L, Marginean N, Marginean R, Mazzocchi C, Mengoni D, Mihai C, Morales AI, Page RD, Pakarinen J, Paulauskas SV, Perea A, Piersa-Siłkowska M, Podolyák Z, Sotty C, Taylor S, Tengblad O, Van Duppen P, Vedia V, Verney D, Warr N, and Yuan CX

Abstract

We investigated decays of ^{51,52,53}K at the ISOLDE Decay Station at CERN in order to understand the mechanism of the β-delayed neutron-emission (βn) process. The experiment quantified neutron and γ-ray emission paths for each precursor. We used this information to test the hypothesis, first formulated by Bohr in 1939, that neutrons in the βn process originate from the structureless "compound nucleus." The data are consistent with this postulate for most of the observed decay paths. The agreement, however, is surprising because the compound-nucleus stage should not be achieved in the studied β decay due to insufficient excitation energy and level densities in the neutron emitter. In the ^{53}K βn decay, we found a preferential population of the first excited state in ^{52}Ca that contradicted Bohr's hypothesis. The latter was interpreted as evidence for direct neutron emission sensitive to the structure of the neutron-unbound state. We propose that the observed nonstatistical neutron emission proceeds through the coupling with nearby doorway states that have large neutron-emission probabilities. The appearance of "compound-nucleus" decay is caused by the aggregated small contributions of multiple doorway states at higher excitation energy.

Published
2024
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