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1. Evidence of Partial Seniority Conservation in the $\pi{g}_{9/2}$ Shell for the $N=50$ Isotones

Author

Perez-Vidal, Rm, Gadea, A, Domingo-Pardo, C, Gargano, A, Valiente-Dobon, Jj, Clement, E, Lemasson, A, Coraggio, L, Siciliano, M, Szilner, S, Bast, M, Braunroth, T, Collado, J, Corina, A, Dewald, A, Doncel, M, Dudouet, J, de France, G, Fransen, C, Gonzalez, V, Huyuk, T, Jacquot, B, John, Pr, Jungclaus, A, Kim, Yh, Korichi, A, Labiche, M, Lenzi, S, Li, H, Ljungvall, J, Lopez-Martens, A, Mengoni, D, Michelagnoli, C, Muller-Gatermann, C, Napoli, Dr, Navin, A, Quintana, B, Ramos, D, Rejmund, M, Sanchis, E, Simpson, J, Stezowski, O, Wilmsen, D, Zielinska, M, Boston, Aj, Barrientos, D, Bednarczyk, P, Benzoni, G, Birkenbach, B, Boston, Hc, Bracco, A, Cederwall, B, Cullen, Dm, Didierjean, F, Eberth, J, Gottardo, A, Goupil, J, Harkness-Brennan, Lj, Hess, H, Judson, Ds, Kaskas, A, Korten, W, Leoni, S, Menegazzo, R, Million, B, Nyberg, J, Podolyak, Z, Pullia, A, Ralet, D, Recchia, F, Reiter, P, Rezynkina, K, Salsac, Md, Senyigit, M, Sohler, D, Theisen, C, Verney, D, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Subatomär fysik, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Physics - Theory, Atom and Molecular Physics and Optics, Subatomic Physics, Atom- och molekylfysik och optik
Abstract

International audience; The reduced transition probabilities for the $4^+_1 \to 2^+_1$ and $2^+_1 \to 0^+_1$ transitions in $^{92}$Mo and $^{94}$Ru and for the $4^+_1 \to 2^+_1$ and $6^+_1 \to 4^+_1$ transitions in $^{90}$Zr have been determined in this experiment making use of a multinucleon transfer reaction. These results have been interpreted on the basis of realistic shell-model calculations in the $f_{5/2}, p_{3/2}, p_{1/2},$ and $g_{9/2}$ proton valence space. Only the combination of extensive lifetime information and large scale shell-model calculations allowed the extent of the seniority conservation in the $N=50 g_{9/2}$ orbital to be understood. The conclusion is that seniority is largely conserved in the first $\pi{g}_{9/2}$ orbital.

Published
2022

2. New beta-decaying state in Bi-214

Author

Andel, B, Van Duppen, P, Andreyev, AN, Blazhev, A, Grawe, H, Lica, R, Naidja, H, Stryjczyk, M, Algora, A, Antalic, S, Barzakh, A, Benito, J, Benzoni, G, Berry, T, Borge, MJG, Chrysalidis, K, Clisu, C, Costache, C, Cubiss, JG, De Witte, H, Fedorov, DV, Fedosseev, VN, Fraile, LM, Fynbo, HOU, Greenlees, PT, Harkness-Brennan, LJ, Huyse, M, Illana, A, Jolie, J, Judson, DS, Konki, J, Lazarus, I, Madurga, M, Marginean, N, Marginean, R, Mihai, C, Marsh, BA, Molkanov, P, Mosat, P, Murias, JR, Nacher, E, Negret, A, Page, RD, Pascu, S, Perea, A, Pucknell, V, Rahkila, P, Rapisarda, E, Rezynkina, K, Sanchez-Tembleque, V, Schomacker, K, Seliverstov, MD, Sotty, C, Stan, L, Surder, C, Tengblad, O, Vedia, V, Vinals, S, Wadsworth, R, Warr, N, Collaboration, IDS, Research Foundation - Flanders, KU Leuven, Belgian Science Policy Office, European Commission, Science and Technology Facilities Council (UK), Slovak Research and Development Agency, Russian Foundation for Basic Research, Institute of Atomic Physics (Romania), Agencia Estatal de Investigación (España), Federal Ministry of Education and Research (Germany), and Ministerio de Ciencia e Innovación (España)

Subjects
Physics, Science & Technology, 010308 nuclear & particles physics, State (functional analysis), 01 natural sciences, ISOLDE, 3. Good health, Physics, Nuclear, NUCLEAR-DATA SHEETS, Quantum mechanics, 0103 physical sciences, Physical Sciences, SHELL-MODEL, Física nuclear, 010306 general physics
Abstract

13 pags., 7 figs., 3 tabs., A new β-decaying state in Bi214 has been identified at the ISOLDE Decay Station at the CERN-ISOLDE facility. A preferred Iπ=(8-) assignment was suggested for this state based on the β-decay feeding pattern to levels in Po214 and shell-model calculations. The half-life of the Iπ=(8-) state was deduced to be T1/2=9.39(10) min. The deexcitation of the levels populated in Po214 by the β decay of this state was investigated via γ-γ coincidences and a number of new levels and transitions was identified. Shell-model calculations for excited states in Bi214 and Po214 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 β-decaying state as an Iπ=8- isomer and allow for tentative assignment of shell-model states to several high-spin states in Po214., This work has been supported by the Research Foundation Flanders (FWO, Belgium), by GOA/2015/010 (BOF KU Leuven), the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office (BriX network P7/12), by the ENSAR2: European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 654002, by the U.K. Science and Technology Facilities Council, by the Slovak Research and Development Agency (Contract No. APVV-18-0268), by the Slovak grant agency VEGA (Contract No. 1/0651/21), by RFBR according to the research project N 19-02-00005, by the Romanian IFA Grant CERN/ISOLDE, by the Spanish Funding Agency (AEI) under the project PID2019-104390GB-I00, by the German BMBF under Grant No. 05P18PKCIA and by the Spanish Ministerio de Ciencia e Innovación grant PID2019-104714GB-C21. M.S. acknowledges funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 771036 (ERC CoG MAIDEN).

Published
2021

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

Author

Piersa-Silkowska, M, Korgul, A, Benito, J, Fraile, LM, Adamska, E, Andreyev, AN, Alvarez-Rodriguez, R, Barzakh, AE, Benzoni, G, Berry, T, Borge, MJG, Carmona, M, Chrysalidis, K, Correia, JG, Costache, C, Cubiss, JG, Goodacre, T Day, De Witte, H, Fedorov, D, Fedosseev, VN, Fernandez-Martinez, G, Fijalkowska, A, Fynbo, H, Galaviz, D, Galve, P, Garcia-Diez, M, Greenlees, PT, Grzywacz, R, Harkness-Brennan, LJ, Henrich, C, Huyse, M, Ibanez, P, Illana, A, Janas, Z, Johnston, K, Jolie, J, Judson, DS, 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, MC, Mazzocchi, C, Miernik, K, Mihai, C, Marginean, N, Marginean, R, Negret, A, Nacher, E, Ojala, J, Olaizola, B, Page, RD, Pakarinen, J, Pascu, S, Paulauskas, S, Perea, A, Pucknell, V, Rahkila, P, Raison, C, Rapisarda, E, Rezynkina, K, Rotaru, F, Rothe, S, Rykaczewski, KP, 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, JM, Van Duppen, P, Vedia, V, Villa, A, Vinals, S, Wadsworth, R, Walters, WB, Warr, N, and Wilkins, SG

Subjects
ISOMER, Science & Technology, NEUTRON EMISSION PROBABILITIES, Physics, MODEL, Physics, Nuclear, NUCLEAR-DATA SHEETS, STATES, Physical Sciences, ISOTOPES, PICOSECOND LIFETIME MEASUREMENTS, RICH NUCLEI, HALF-LIVES, SN-132
Abstract

ispartof: PHYSICAL REVIEW C vol:104 issue:4 status: published

Published
2021

4. 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

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

Author

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

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

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

Published
2020

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

Author

Stryjczyk, M, Andel, B, Andreyev, AN, Cubiss, J, Pakarinen, J, Rezynkina, K, Van Duppen, P, Antalic, S, Berry, T, Borge, MJG, Clisu, C, Cox, DM, De Witte, H, Fraile, LM, Fynbo, HOU, Gaffney, LP, Harkness-Brennan, LJ, Huyse, M, Illana, A, Judson, DS, 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, JD, Page, RD, Papadakis, P, Pascu, S, Perea, A, Podolyák, Z, Pucknell, V, Rapisarda, E, Rotaru, F, Sotty, C, Tengblad, O, Vedia, V, Viñals, S, Wadsworth, R, Warr, N, Wrzosek-Lipska, K, and IDS Collaboration

Abstract

ispartof: Physical Review C vol:102 issue:2 status: published

Published
2020

7. Detailed spectroscopy of doubly magic 132Sn

Author

Benito, J, Fraile, LM, Korgul, A, Piersa, M, Adamska, E, Andreyev, AN, Álvarez-Rodríguez, R, Barzakh, AE, Benzoni, G, Berry, T, Borge, MJG, Carmona, M, Chrysalidis, K, Costache, C, Cubiss, JG, Day Goodacre, T, De Witte, H, Fedorov, DV, Fedosseev, VN, Fernández-Martínez, G, Fijałkowska, A, Fila, M, Fynbo, H, Galaviz, D, Galve, P, García-Díez, M, Greenlees, PT, Grzywacz, R, Harkness-Brennan, LJ, Henrich, C, Huyse, M, Ibáñez, P, Illana Sison, A, Janas, Z, Jolie, J, Judson, DS, Karayonchev, V, Kicińska-Habior, M, Konki, J, Kurcewicz, J, Lazarus, I, Lică, R, López-Montes, A, Lund, M, Mach, H, Madurga, M, Marroquín, I, Marsh, B, Martínez, MC, Mazzocchi, C, Mărginean, N, Mărginean, R, Miernik, K, Mihai, C, Mihai, RE, Nácher, E, Negret, A, Olaizola, B, Page, RD, Paulauskas, SV, 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, GS, Sotty, C, Stan, L, Stănoiu, M, Stryjczyk, M, Tengblad, O, Turturica, A, Udías, JM, Van Duppen, P, Vedia, V, Villa-Abaunza, A, Viñals, S, Walters, WB, Wadsworth, R, Warr, N, and IDS Collaboration

Abstract

ispartof: Physical Review C vol:102 issue:1 status: published

Published
2020

8. Nuclear structure of Au-181 studied via beta(+)/EC decay of Hg-181 at ISOLDE

Author

Sedlak, M, Venhart, M, Wood, JL, Matousek, V, Balogh, M, Boston, AJ, Cocolios, TE, Harkness-Brennan, LJ, Herzberg, R-D, Joss, DT, Judson, DS, Kliman, J, Page, RD, Patel, A, Petrik, K, and Veselsky, M

Subjects
RELEASE, Science & Technology, Physics, ALPHA-DECAY, Physics, Particles & Fields, ENERGY, Physics, Nuclear, EXCITED-STATES, SPIN, SHAPE COEXISTENCE, Physical Sciences, BETA-DECAY, PARTICLE, DATA SHEETS, TRANSITION
Abstract

ispartof: EUROPEAN PHYSICAL JOURNAL A vol:56 issue:6 status: published

Published
2020

9. (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

10. 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

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

Author

Piersa, M, Korgul, A, Fraile, LM, Benito, J, Adamska, E, Andreyev, AN, Álvarez-Rodríguez, R, Barzakh, AE, Benzoni, G, Berry, T, Borge, MJG, Carmona, M, Chrysalidis, K, Correia, JG, Costache, C, Cubiss, JG, Day Goodacre, T, De Witte, H, Fedorov, DV, Fedosseev, VN, Fernández-Martínez, G, Fijałkowska, A, Fila, M, Fynbo, H, Galaviz, D, Greenlees, PT, Grzywacz, R, Harkness-Brennan, LJ, Henrich, C, Huyse, M, Illana Sison, A, Janas, Z, Johnston, K, Judson, DS, Karanyonchev, V, Kicińska-Habior, M, Konki, J, Kurcewicz, J, Lazarus, I, Lică, R, Mach, H, Madurga, M, Marroquín, I, Marsh, B, Martínez, MC, Mazzocchi, C, Mărginean, N, Mărginean, R, Miernik, K, Mihai, C, Nácher, E, Negret, A, Olaizola, B, Page, RD, 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, C, Stan, L, Stănoiu, M, Stryjczyk, M, Tengblad, O, Turturica, A, Udías, JM, Van Duppen, P, Vedia, V, Villa, A, Viñals, S, Wadsworth, R, Walters, WB, Warr, N, and IDS Collaboration

Abstract

© 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Excited states in Sn133 were investigated through the β decay of In133 at the ISOLDE facility. The ISOLDE Resonance Ionization Laser Ion Source (RILIS) provided isomer-selective ionization for In133, allowing us to study separately, and in detail, the β-decay branch of In133Jπ=(9/2+) ground state and its Jπ=(1/2-) isomer. Thanks to the large spin difference of the two β-decaying states of In133, it is possible to investigate separately the lower and higher spin states in the daughter, Sn133, and thus to probe independently different single-particle and single-hole levels. We report here new γ transitions observed in the decay of In133, including those assigned to the deexcitation of the neutron-unbound states. ispartof: Physical Review C vol:99 issue:2 status: published

Published
2019

14. Role of the Delta Resonance in the Population of a Four-Nucleon State in the 56Fe to 54Fe Reaction at Relativistic Energies

Author

Podolyak, Zs, Harkness-Brennan, LJ, and Judson, DS

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The 54Fe nucleus was populated from a 56Fe beam impinging on a Be target with an energy of E/A=500MeV. The internal decay via γ-ray emission of the 10+ metastable state was observed. As the structure of this isomeric state has to involve at least four unpaired nucleons, it cannot be populated in a simple two-neutron removal reaction from the 56Fe ground state. The isomeric state was produced in the low-momentum (-energy) tail of the parallel momentum (energy) distribution of 54Fe, suggesting that it was populated via the decay of the Δ0 resonance into a proton. This process allows the population of four-nucleon states, such as the observed isomer. Therefore, it is concluded that the observation of this 10+ metastable state in 54Fe is a consequence of the quark structure of the nucleons.

Published
2016

15. Beta-delayed proton emission from Mg-20

Author

Lund, MV, Andreyev, A, Borge, MJG, Cederkall, J, De Witte, H, Fraile, LM, Fynbo, HOU, Greenlees, PT, Harkness-Brennan, LJ, Howard, AM, Huyse, M, Jonson, B, Judson, DS, Kirsebom, OS, Konki, J, Kurcewicz, J, Lazarus, I, Lica, R, Lindberg, S, Madurga, M, Marginean, N, Marginean, R, Marroquin, I, Mihai, C, Munch, M, Nacher, E, Negret, A, Nilsson, T, Page, RD, Pascu, S, Perea, A, Pucknell, V, Rahkila, P, Rapisarda, E, Riisager, K, Rotaru, F, Sotty, C, Stanoiu, M, Tengblad, O, Turturica, A, Van Duppen, P, Vedia, V, Wadsworth, R, Warr, N, and Collaboration, IDS

Published
2016

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

Author

Lica, R, Mach, H, Fraile, LM, Gargano, A, Borge, MJG, Marginean, N, Sotty, CO, Vedia, V, Andreyev, AN, Benzoni, G, Bomans, P, Borcea, R, Coraggio, L, Costache, C, Flavigny, F, Fynbo, H, Gaffney, Liam, Greenlees, PT, Harkness-Brennan, LJ, Huyse, Mark, Ibanez, P, Judson, DS, Konki, J, Korgul, A, Kroell, T, Kurcewicz, J, Lalkovski, S, Lazarus, I, Lund, MV, Madurga, M, Marginean, R, Marroquin, I, Mihai, C, Mihai, RE, Morales, AI, Nacher, E, Negret, A, Page, RD, Pakarinen, J, Pascu, S, Paziy, V, Perea, A, Perez-Liva, M, Picado, E, Pucknell, V, Rapisarda, E, Rahkila, P, Rotaru, F, Swartz, JA, Tengblad, O, Van Duppen, Piet, Wadsworth, R, Walters, WB, and Warr, N

Abstract

© 2016 authors. Published by the American Physical Society. The levels in Sn129 populated from the β- decay of In129 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 Sn129 are expected to have configurations dominated by the neutron s1/2 (l=0) and d3/2 (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 have measured the half-life of the 1/2+ 315.3-keV state, T1/2= 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 T1/2 value by the renormalization of the M1 effective operator for neutron holes. We express our deep appreciation to the late Professor Henryk Mach, who was the initiator of this investigation. He was an inspiring collaborator, mentor, and leader in developing the βγ γ (t) fast-timing technique. His memory and accomplishments will always be with us. This work was partially supported by the Spanish MINECO through Projects No. FPA2012-32443, No. FPA2013-41267-P, and CPAN Consolider (Project No. CSD-2007-00042), and by Romanian IFA Grant CERN/ISOLDE. It was also partly funded by the NuPNET network FATIMA (PRI-PIMNUP-2011-1338), by FWO-Vlaanderen (Belgium), by GOA/2010/010 (BOF KU Leuven), and by the Interuniversity Attraction Poles Programme initiated by the Belgian Science PolicyOffice (BriX network P7/12). Support from Grupo de F´ısica Nuclear (GFN-UCM), Programmi di Ricerca Scientifica di Rilevante Interesse Nazionale (PRIN) Grant No. 2001024324 01302, German BMBF under Contracts No. 05P12PKFNE and No. 05P15PKCIA, the U.K. Science and Technology Facilities Council, and the European Union Seventh Framework through ENSAR (Contract No. 262010) is also acknowledged. Fasttiming electronics were provided by the Fast Timing Collaboration, the ISOLDE Decay Station collaboration, and MASTICON. ispartof: PHYSICAL REVIEW C vol:93 issue:4 status: published

Published
2016

17. Fast-timing study of the l -forbidden 12+→32+ M1 transition in Sn 129 FAST-TIMING STUDY of the l -FORBIDDEN ⋯ R. LICǎ et al

Author

LicǍ, R, Mach, H, Fraile, LM, Gargano, A, Borge, MJG, MǍrginean, N, Sotty, CO, Vedia, V, Andreyev, AN, Benzoni, G, Bomans, P, Borcea, R, Coraggio, L, Costache, C, De Witte, H, Flavigny, F, Fynbo, H, Gaffney, LP, Greenlees, PT, Harkness-Brennan, LJ, Huyse, M, Ibáñez, P, Judson, DS, Konki, J, Korgul, A, Kröll, T, Kurcewicz, J, Lalkovski, S, Lazarus, I, Lund, MV, Madurga, M, MǍrginean, R, Marroquín, I, Mihai, C, Mihai, RE, Morales, AI, Nácher, E, Negret, A, Page, RD, Pakarinen, J, Pascu, S, Paziy, V, Perea, A, Pérez-Liva, M, Picado, E, Pucknell, V, Rapisarda, E, Rahkila, P, Rotaru, F, Swartz, JA, Tengblad, O, Van Duppen, P, Vidal, M, Wadsworth, R, Walters, WB, and Warr, N

Abstract

© 2016 authors. Published by the American Physical Society.The levels in Sn129 populated from the β- decay of In129 isomers were investigated at the ISOLDE facility of CERN using the newly commissioned ISOLDE Decay Station (IDS). The lowest 12+ state and the 32+ ground state in Sn129 are expected to have configurations dominated by the neutron s12 (l=0) and d32 (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 have measured the half-life of the 12+ 315.3-keV state, T12= 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 T12 value by the renormalization of the M1 effective operator for neutron holes.

Published
2016

18. 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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19. High-Precision Spectroscopy of ^{20}O Benchmarking Ab Initio Calculations in Light Nuclei.

Author

Zanon I, Clément E, Goasduff A, Menéndez J, Miyagi T, Assié M, Ciemała M, Flavigny F, Lemasson A, Matta A, Ramos D, Rejmund M, Achouri L, Ackermann D, Barrientos D, Beaumel D, Benzoni G, Boston AJ, Boston HC, Bottoni S, Bracco A, Brugnara D, de France G, de Sereville N, Delaunay F, Desesquelles P, Didierjean F, Domingo-Prato C, Dudouet J, Eberth J, Fernández D, Fougères C, Gadea A, Galtarossa F, Girard-Alcindor V, Gonzales V, Gottardo A, Hammache F, Harkness-Brennan LJ, Hess H, Judson DS, Jungclaus A, Kaşkaş A, Kim YH, Kuşoğlu A, Labiche M, Leblond S, Lenain C, Lenzi SM, Leoni S, Li H, Ljungvall J, Lois-Fuentes J, Lopez-Martens A, Maj A, Menegazzo R, Mengoni D, Michelagnoli C, Million B, Napoli DR, Nyberg J, Pasqualato G, Podolyak Z, Pullia A, Quintana B, Recchia F, Regueira-Castro D, Reiter P, Rezynkina K, Rojo JS, Salsac MD, Sanchis E, Şenyiğit M, Siciliano M, Sohler D, Stezowski O, Theisen C, Utepov A, Valiente-Dobón JJ, Verney D, and Zielinska M

Abstract

The excited states of unstable ^{20}O were investigated via γ-ray spectroscopy following the ^{19}O(d,p)^{20}O reaction at 8  AMeV. By exploiting the Doppler shift attenuation method, the lifetimes of the 2_{2}^{+} and 3_{1}^{+} states were firmly established. From the γ-ray branching and E2/M1 mixing ratios for transitions deexciting the 2_{2}^{+} and 3_{1}^{+} states, the B(E2) and B(M1) were determined. Various chiral effective field theory Hamiltonians, describing the nuclear properties beyond ground states, along with a standard USDB interaction, were compared with the experimentally obtained data. Such a comparison for a large set of γ-ray transition probabilities with the valence space in medium similarity renormalization group ab initio calculations was performed for the first time in a nucleus far from stability. It was shown that the ab initio approaches using chiral effective field theory forces are challenged by detailed high-precision spectroscopic properties of nuclei. The reduced transition probabilities were found to be a very constraining test of the performance of the ab initio models.

Published
2023
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20. ^{133}In: A Rosetta Stone for Decays of r-Process Nuclei.

Author

Xu ZY, Madurga M, Grzywacz R, King TT, Algora A, Andreyev AN, Benito J, Berry T, Borge MJG, Costache C, De Witte H, Fijalkowska A, Fraile LM, Fynbo HOU, Gottardo A, Halverson C, Harkness-Brennan LJ, Heideman J, Huyse M, Illana A, Janiak Ł, Judson DS, Korgul A, Kurtukian-Nieto T, Lazarus I, Lică R, Lozeva R, Marginean N, Marginean R, Mazzocchi C, Mihai C, Mihai RE, Morales AI, Page RD, Pakarinen J, Piersa-Siłkowska M, Podolyák Z, Sarriguren P, Singh M, Sotty C, Stepaniuk M, Tengblad O, Turturica A, Van Duppen P, Vedia V, Viñals S, Warr N, Yokoyama R, and Yuan CX

Abstract

The β 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 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 ^{133}Sn. 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 ^{132}Sn 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.

Published
2023
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21. β-Delayed One and Two Neutron Emission Probabilities Southeast of ^{132}Sn and the Odd-Even Systematics in r-Process Nuclide Abundances.

Author

Phong VH, Nishimura S, Lorusso G, Davinson T, Estrade A, Hall O, Kawano T, Liu J, Montes F, Nishimura N, Grzywacz R, Rykaczewski KP, Agramunt J, Ahn DS, Algora A, Allmond JM, Baba H, Bae S, Brewer NT, Bruno CG, Caballero-Folch R, Calviño F, Coleman-Smith PJ, Cortes G, Dillmann I, Domingo-Pardo C, Fijalkowska A, Fukuda N, Go S, Griffin CJ, Ha J, Harkness-Brennan LJ, Isobe T, Kahl D, Khiem LH, Kiss GG, Korgul A, Kubono S, Labiche M, Lazarus I, Liang J, Liu Z, Matsui K, Miernik K, Moon B, Morales AI, Morrall P, Nepal N, Page RD, Piersa-Siłkowska M, Pucknell VFE, Rasco BC, Rubio B, Sakurai H, Shimizu Y, Stracener DW, Sumikama T, Suzuki H, Tain JL, Takeda H, Tarifeño-Saldivia A, Tolosa-Delgado A, Wolińska-Cichocka M, Woods PJ, and Yokoyama R

Abstract

The β-delayed one- and two-neutron emission probabilities (P_{1n} and P_{2n}) of 20 neutron-rich nuclei with N≥82 have been measured at the RIBF facility of the RIKEN Nishina Center. P_{1n} of ^{130,131}Ag, ^{133,134}Cd, ^{135,136}In, and ^{138,139}Sn were determined for the first time, and stringent upper limits were placed on P_{2n} for nearly all cases. β-delayed two-neutron emission (β2n) was unambiguously identified in ^{133}Cd and ^{135,136}In, and their P_{2n} were measured. Weak β2n was also detected from ^{137,138}Sn. Our results highlight the effect of the N=82 and Z=50 shell closures on β-delayed neutron emission probability and provide stringent benchmarks for newly developed macroscopic-microscopic and self-consistent global models with the inclusion of a statistical treatment of neutron and γ emission. The impact of our measurements on r-process nucleosynthesis was studied in a neutron star merger scenario. Our P_{1n} and P_{2n} have a direct impact on the odd-even staggering of the final abundance, improving the agreement between calculated and observed Solar System abundances. The odd isotope fraction of Ba in r-process-enhanced (r-II) stars is also better reproduced using our new data.

Published
2022
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22. Evidence of Partial Seniority Conservation in the πg_{9/2} Shell for the N=50 Isotones.

Author

Pérez-Vidal RM, Gadea A, Domingo-Pardo C, Gargano A, Valiente-Dobón JJ, Clément E, Lemasson A, Coraggio L, Siciliano M, Szilner S, Bast M, Braunroth T, Collado J, Corina A, Dewald A, Doncel M, Dudouet J, de France G, Fransen C, González V, Hüyük T, Jacquot B, John PR, Jungclaus A, Kim YH, Korichi A, Labiche M, Lenzi S, Li H, Ljungvall J, López-Martens A, Mengoni D, Michelagnoli C, Müller-Gatermann C, Napoli DR, Navin A, Quintana B, Ramos D, Rejmund M, Sanchis E, Simpson J, Stezowski O, Wilmsen D, Zielińska M, Boston AJ, Barrientos D, Bednarczyk P, Benzoni G, Birkenbach B, Boston HC, Bracco A, Cederwall B, Cullen DM, Didierjean F, Eberth J, Gottardo A, Goupil J, Harkness-Brennan LJ, Hess H, Judson DS, Kaşkaş A, Korten W, Leoni S, Menegazzo R, Million B, Nyberg J, Podolyak Z, Pullia A, Ralet D, Recchia F, Reiter P, Rezynkina K, Salsac MD, Şenyiğit M, Sohler D, Theisen C, and Verney D

Abstract

The reduced transition probabilities for the 4_{1}^{+}→2_{1}^{+} and 2_{1}^{+}→0_{1}^{+} transitions in ^{92}Mo and ^{94}Ru and for the 4_{1}^{+}→2_{1}^{+} and 6_{1}^{+}→4_{1}^{+} transitions in ^{90}Zr have been determined in this experiment making use of a multinucleon transfer reaction. These results have been interpreted on the basis of realistic shell-model calculations in the f_{5/2}, p_{3/2}, p_{1/2}, and g_{9/2} proton valence space. Only the combination of extensive lifetime information and large scale shell-model calculations allowed the extent of the seniority conservation in the N=50 g_{9/2} orbital to be understood. The conclusion is that seniority is largely conserved in the first πg_{9/2} orbital.

Published
2022
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23. Competition between Allowed and First-Forbidden β Decay: The Case of ^{208}Hg→^{208}Tl.

Author

Carroll RJ, Podolyák Z, 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 RB, Górska M, Gredley A, Greenlees PT, Harkness-Brennan LJ, Huyse M, Judge SM, Judson DS, Konki J, Kurcewicz J, Kuti I, Lalkovski S, Lazarus IH, Lică R, Lund M, Madurga M, Marginean N, Marginean R, Marroquin I, Mihai C, Mihai RE, Nácher 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 C, Tengblad O, Van Duppen P, Vedia V, Wadsworth R, Walker PM, Warr N, Wearing F, and De Witte H

Abstract

The β decay of ^{208}Hg into the one-proton hole, one neutron-particle &#95;{81}^{208}Tl&#95;{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&#95;{β} window, only three negative parity states are populated directly in the β decay. The data provide a unique test of the competition between allowed Gamow-Teller and Fermi, and first-forbidden β 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^{-}β decay where the daughter state is core excited is unique, and can provide information on mesonic corrections of effective operators.

Published
2020
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24. Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the ^{78}Ni Region: A Hint from Lifetime Measurements.

Author

Delafosse C, Verney D, Marević P, Gottardo A, Michelagnoli C, Lemasson A, Goasduff A, Ljungvall J, Clément E, Korichi A, De Angelis G, Andreoiu C, Babo M, Boso A, Didierjean F, Dudouet J, Franchoo S, Gadea A, Georgiev G, Ibrahim F, Jacquot B, Konstantinopoulos T, Lenzi SM, Maquart G, Matea I, Mengoni D, Napoli DR, Nikšić T, Olivier L, Pérez-Vidal RM, Portail C, Recchia F, Redon N, Siciliano M, Stefan I, Stezowski O, Vretenar D, Zielinska M, Barrientos D, Benzoni G, Birkenbach B, Boston AJ, Boston HC, Cederwall B, Charles L, Ciemala M, Collado J, Cullen DM, Désesquelles P, de France G, Domingo-Pardo C, Eberth J, González V, Harkness-Brennan LJ, Hess H, Judson DS, Jungclaus A, Korten W, Lefevre A, Legruel F, Menegazzo R, Million B, Nyberg J, Quintana B, Ralet D, Reiter P, Saillant F, Sanchis E, Theisen C, and Valiente Dobon JJ

Abstract

Lifetime measurements of excited states of the light N=52 isotones ^{88}Kr, ^{86}Se, and ^{84}Ge have been performed, using the recoil distance Doppler shift method and VAMOS and AGATA spectrometers for particle identification and gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities B(E2;2^{+}→0^{+}) and B(E2;4^{+}→2^{+}) were obtained for the first time for the hard-to-reach ^{84}Ge. While the B(E2;2^{+}→0^{+}) values of ^{88}Kr, ^{86}Se saturate the maximum quadrupole collectivity offered by the natural valence (3s, 2d, 1g&#95;{7/2}, 1h&#95;{11/2}) space of an inert ^{78}Ni core, the value obtained for ^{84}Ge largely exceeds it, suggesting that shape coexistence phenomena, previously reported at N≲49, extend beyond N=50. The onset of collectivity at Z=32 is understood as due to a pseudo-SU(3) organization of the proton single-particle sequence reflecting a clear manifestation of pseudospin symmetry. It is realized that the latter provides actually reliable guidance for understanding the observed proton and neutron single particle structure in the whole medium-mass region, from Ni to Sn, pointing towards the important role of the isovector-vector ρ field in shell-structure evolution.

Published
2018
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25. First Accurate Normalization of the β-delayed α Decay of ^{16}N and Implications for the ^{12}C(α,γ)^{16}O Astrophysical Reaction Rate.

Author

Kirsebom OS, Tengblad O, Lica R, Munch M, Riisager K, Fynbo HOU, Borge MJG, Madurga M, Marroquin I, Andreyev AN, Berry TA, Christensen ER, Fernández PD, Doherty DT, Van Duppen P, Fraile LM, Gallardo MC, Greenlees PT, Harkness-Brennan LJ, Hubbard N, Huyse M, Jensen JH, Johansson H, Jonson B, Judson DS, Konki J, Lazarus I, Lund MV, Marginean N, Marginean R, Perea A, Mihai C, Negret A, Page RD, Pucknell V, Rahkila P, Sorlin O, Sotty C, Swartz JA, Sørensen HB, Törnqvist H, Vedia V, Warr N, and De Witte H

Abstract

The ^{12}C(α,γ)^{16}O 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 α width, γ&#95;{11}, of the bound 1^{-} level in ^{16}O is particularly important to determine the cross section. The magnitude of γ&#95;{11} is determined via sub-Coulomb α-transfer reactions or the β-delayed α decay of ^{16}N, but the latter approach is presently hampered by the lack of sufficiently precise data on the β-decay branching ratios. Here we report improved branching ratios for the bound 1^{-} level [b&#95;{β,11}=(5.02±0.10)×10^{-2}] and for β-delayed α emission [b&#95;{βα}=(1.59±0.06)×10^{-5}]. Our value for b&#95;{βα} is 33% larger than previously held, leading to a substantial increase in γ&#95;{11}. Our revised value for γ&#95;{11} is in good agreement with the value obtained in α-transfer studies and the weighted average of the two gives a robust and precise determination of γ&#95;{11}, which provides significantly improved constraints on the ^{12}C(α,γ) cross section in the energy range relevant to hydrostatic He burning.

Published
2018
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