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49 results on '"Stryjczyk, M"'

1. Production study of Fr, Ra and Ac radioactive ion beams at ISOLDE, CERN

Author

Jajčišinová, E., Dockx, K., Au, M., Bara, S., Cocolios, T. E., Chrysalidis, K., Farooq-Smith, G. J., Fedorov, D. V., Fedosseev, V. N., Flanagan, K. T., Heines, M., Houngbo, D., Johnson, J. D., Kellerbauer, A., Kraemer, S., Marsh, B. A., Popescu, L., Ramos, J. P., Rothe, S., Seliverstov, M. D., Sels, S., Stegemann, S., Stryjczyk, M., and Verelst, V.

Published
2024
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5. VADER: A novel decay station for actinide spectroscopy

Author

Raggio, A., Pohjalainen, I., Rey-Herme, E., Beliuskina, O., Bequet, J., Block, M., Eronen, T., Illana, A., Jaries, A., Kankainen, A., Kumar, D., Moore, I.D., Mougeot, M., Plaza, A.M., Reponen, M., Sarén, J., Sulignano, B., Stryjczyk, M., Thisse, D., Vandebrouck, M., and Warbinek, J.

Published
2023
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7. First investigation on the isomeric ratio in multinucleon transfer reactions: Entrance channel effects on the spin distribution

Author

Kumar, D., Dickel, T., Zadvornaya, A., Beliuskina, O., Kankainen, A., Constantin, P., Purushothaman, S., Spataru, A., Stryjczyk, M., Al Ayoubi, L., Brunet, M., Canete, L., Delafosse, C., de Groote, R.P., de Roubin, A., Eronen, T., Ge, Z., Gins, W., Hornung, C., Hukkanen, M., Illana, A., Jokinen, A., Kahl, D., Kindler, B., Lommel, B., Mardor, I., Moore, I.D., Nesterenko, D.A., Nichita, D., Nikas, S., Ortiz-Cortes, A., Penttilä, H., Podolyák, Zs., Pohjalainen, I., Raggio, A., Reponen, M., Rinta-Antila, S., Romero, J., Saren, J., Vilen, M., Virtanen, V., Weaver, A., and Winfield, J.

Published
2024
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8. Addendum: The observation of vibrating pear-shapes in radon nuclei

Author

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

Published
2020
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9. Publisher Correction: The observation of vibrating pear-shapes in radon nuclei

Author

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

Published
2020
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10. The observation of vibrating pear-shapes in radon nuclei

Author

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

Published
2019
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11. High-precision measurements of low-lying isomeric states in $^{120-124}$In with JYFLTRAP double Penning trap

Author

Nesterenko, D. A., Ruotsalainen, J., Stryjczyk, M., Kankainen, A., Ayoubi, L. Al, Beliuskina, O., Delahaye, P., Eronen, T., Flayol, M., Ge, Z., Gins, W., Hukkanen, M., Jaries, A., Kahl, D., Kumar, D., Nikas, S., Ortiz-Cortes, A., Penttilä, H., Pitman-Weymouth, D., Raggio, A., Ramalho, M., Reponen, M., Rinta-Antila, S., Romero, J., de Roubin, A., Srivastava, P. C., Suhonen, J., Virtanen, V., Zadvornaya, A., 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), 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), Laboratoire de Physique des Deux Infinis Bordeaux (LP2I - Bordeaux), and Université de Bordeaux (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Neutron-rich $^{120-124}$In isotopes have been studied utilizing the double Penning trap mass spectrometer JYFLTRAP at the IGISOL facility. Using the phase-imaging ion-cyclotron-resonance technique, the isomeric states were resolved from ground states and their excitation energies measured with high precision in $^{121,123,124}$In. The $1^+$ states in $^{120,122}$In were separated from the $5^+$ and $8^-$ states, whose presence was confirmed by post-trap decay spectroscopy. The energy difference between the unresolved high-spin states in $^{120,122}$In was $\leq15$~keV. Experimental results were compared with energy density functionals, density functional theory and shell-model calculations., 11 pages, 7 figures

Published
2023

12. $\beta^-$ decay $Q$-value measurement of $^{136}$Cs and its implications to neutrino studies

Author

Ge, Z., Eronen, T., de Roubin, A., Ramalho, M., Kostensalo, J., Kotila, J., Suhonen, J., Nesterenko, D. A., Kankainen, A., Ascher, P., Beliuskina, O., Flayol, M., Gerbaux, M., Grévy, S., Hukkanen, M., Husson, A., Jaries, A., Jokinen, A., Moore, I. D., Pirinen, P., Romero, J., Stryjczyk, M., Virtanen, V., and Zadvornaya, A.

Subjects
Nuclear Experiment
Abstract

The $\beta^-$ decay $Q$-value of $^{136}$Cs ($J^\pi = 5^+$, $t_{1/2} \approx 13$~days) was measured with the JYFLTRAP Penning trap setup at the Ion Guide Isotope Separator On-Line (IGISOL) facility of the University of Jyv\"askyl\"a, Finland. The mono-isotopic samples required in the measurements were prepared with a new scheme utilised for the cleaning, based on the coupling of dipolar excitation with Ramsey's method of time-separated oscillatory fields and the phase-imaging ion-cyclotron-resonance (PI-ICR) technique. The $Q$ value is determined to be 2536.83(45) keV, which is $\sim$4 times more precise and 11.4(20) keV ($\sim$ 6$\sigma$) smaller than the adopted value in the most recent Atomic Mass Evaluation AME2020. The daughter, $^{136}$Ba, has a 4$^+$ state at 2544.481(24) keV and a $3^-$ state at 2532.653(23) keV, both of which can potentially be ultralow $Q$-value end-states for the $^{136}$Cs decay. With our new ground-to-ground state $Q$ value, the decay energies to these two states become -7.65(45) keV and 4.18(45) keV, respectively. The former is confirmed to be negative at the level of $\sim$ 17$\sigma$, which verifies that this transition is not a suitable candidate for neutrino mass determination. On the other hand, the slightly negative $Q$ value makes this transition an interesting candidate for the study of virtual $\beta$-$\gamma$ transitions. The decay to the 3$^{-}$ state is validated to have a positive low $Q$ value which makes it a viable candidate for neutrino mass determination. For this transition, we obtained a shell-model-based half-life estimate of $2.1_{-0.8}^{+1.6}\times10^{12}$ yr., Comment: 9 pages, 8 figures

Published
2023

13. Simultaneous $\gamma$-ray and electron spectroscopy of $^{182,184,186}$Hg isotopes

Author

Stryjczyk, M., Andel, B., Cubiss, J. G., Rezynkina, K., Rodríguez, T. R., García-Ramos, J. E., Andreyev, A. N., Pakarinen, J., 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., Próchniak, L., Pucknell, V., Rapisarda, E., Rotaru, F., Sotty, C., Tengblad, O., Vedia, V., Viñals, S., Wadsworth, R., Warr, N., and Wrzosek-Lipska, K.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Background: The mercury isotopes around $N=104$ are a well-known example of nuclei exhibiting shape coexistence. Mixing of configurations can be studied by measuring the monopole strength $\rho^2(E0)$, however, currently the experimental information is scarce and lacks precision, especially for the $I^\pi \rightarrow I^\pi$ ($I \neq 0$) transitions. Purpose: The goals of this study were to increase the precision of the known branching ratios and internal conversion coefficients, to increase the amount of available information regarding excited states in $^{182,184,186}$Hg and to interpret the results in the framework of shape coexistence using different models. Method: The low-energy structures in $^{182,184,186}$Hg were populated in the $\beta$ decay of $^{182,184,186}$Tl, produced at ISOLDE and purified by laser ionization and mass separation. The $\gamma$-ray and internal conversion electron events were detected by five germanium clover detectors and a segmented silicon detector, respectively, and correlated in time to build decay schemes. Results: In total, 193, 178 and 156 transitions, including 144, 140 and 108 observed for the first time in a $\beta$-decay experiment, were assigned to $^{182,184,186}$Hg, respectively. Internal conversion coefficients were determined for 23 transitions, out of which 12 had an $E0$ component. Extracted branching ratios allowed the sign of the interference term in $^{182}$Hg as well as $\rho^2(E0;0^+_2\rightarrow 0^+_1)$ and $B(E2;0^+_2\rightarrow 2^+_1)$ in $^{184}$Hg to be determined. By means of electron-electron coincidences, the $0^+_3$ state was identified in $^{184}$Hg. The experimental results were qualitatively reproduced by five theoretical approaches, the IBM with configuration mixing with two different parametrizations, the General Bohr Hamiltonian, the BMF model and the SCCM model. However, a quantitative description is lacking., Comment: 21 pages, 30 figures, accepted for publication in Physical Review C

Published
2023

14. Precision mass measurement of 173Hf for nuclear structure of 173Lu and the γ process.

Author

Jaries, A., Stryjczyk, M., Kankainen, A., Eronen, T., Ge, Z., Hukkanen, M., Moore, I. D., Mougeot, M., Raggio, A., Rattanasakuldilok, W., and Ruotsalainen, J.

Abstract

We report on the precise mass measurement of the 173 Hf isotope performed at the Ion Guide Isotope Separator On-Line facility using the JYFLTRAP double Penning trap mass spectrometer. The new mass-excess value, ME = - 55390.8 (30) keV, is in agreement with the literature while being nine times more precise. The newly determined 173 Hf electron-capture Q value, Q EC = 1490.2 (34) keV, allows us to firmly reject the population of an excited state at 1578 keV in 173 Lu and 11 transitions tentatively assigned to the decay of 173 Hf. Our refined mass value of 173 Hf reduces mass-related uncertainties in the reaction rate of 174 Hf (γ , n) 173 Hf. Thus, the rate for the main photodisintegration destruction channel of the p nuclide 174 Hf in the relevant temperature region for the γ process is better constrained. [ABSTRACT FROM AUTHOR]

Published
2023
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16. Coulomb excitation of Rn-222

Author

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

Subjects
Science & Technology, Physics, Nuclear, STATES, Physics, SHAPES, Physical Sciences, ISOTOPES, RADON
Abstract

The nature of quadrupole and octupole collectivity in 222Rn was investigated by determining the electric-quadrupole (E2) and octupole (E3) matrix elements using subbarrier, multistep Coulomb excitation. The radioactive 222Rn beam, accelerated to 4.23 MeV/u, was provided by the HIE-ISOLDE facility at CERN. Data were collected in the Miniball γ-ray spectrometer following the bombardment of two targets, 120Sn and 60Ni. Transition E2 matrix elements within the ground-state and octupole bands were measured up to 10ℏ and the results were consistent with a constant intrinsic electric-quadrupole moment, 518(11)efm2. The values of the intrinsic electric-octupole moment for the 0+→3− and 2+→5− transitions were found to be respectively 2360+300−210efm3 and 2300+300−500efm3 while a smaller value, 1200+500−900efm3, was found for the 2+→1− transition. In addition, four excited non-yrast states were identified in this work via γ−γ coincidences.

Published
2022

17. Direct determination of the excitation energy of the quasistable isomer 180mTa

Author

Nesterenko, D. A., Blaum, K., Delahaye, P., Eliseev, S., Eronen, T., Filianin, P., Ge, Z., Hukkanen, M., Kankainen, A., Novikov, Yu. N., Popov, A. V., Raggio, A., Stryjczyk, M., and Virtanen, V.

Subjects
tantaali, ydinfysiikka
Abstract

180mTa is a naturally abundant quasistable nuclide and the longest-lived nuclear isomer known to date. It is of interest, among others, for the search for dark matter, for the development of a γ laser, and for astrophysics. So far, its excitation energy has not been measured directly but has been based on an evaluation of available nuclear reaction data. We have determined the excitation energy of this isomer with high accuracy using the Penning-trap mass spectrometer JYFLTRAP. The determined mass difference between the ground and isomeric states of 180Ta yields an excitation energy of 76.79(55) keV for 180mTa. This is the first direct measurement of the excitation energy and provides a better accuracy than that of the previous evaluation value, 75.3(14) keV. peerReviewed

Published
2022

18. Coulomb excitation of 222Rn

Author

Spagnoletti, P., Butler, P.A., Gaffney, L.P., Abrahams, K., Bowry, M., Cederkäll, J., Chupp, T., de Angelis, G., de Witte, H., Garrett, P.E., Goldkuhle, A., Henrich, C., Illana, A., Johnston, K., Joss, D.T., Keatings, J.M., Kelly, N.A., Komorowska, M., Konki, J., Kröll, T., Lozano, M., Singh, B.S. Nara, O'Donnell, D., Ojala, J., Page, R.D., Pedersen, L.G., Raison, C., Reiter, P., Rodriguez, J.A., Rosiak, D., Rothe, S., Scheck, M., Seidlitz, M., Shneidman, T.M., Siebeck, B., Sinclair, J., Smith, J.F., Stryjczyk, M., van Duppen, P., Viñals, S., Virtanen, V., Wrzosek-Lipska, K., Warr, N., Zielińska, M., Helsinki Institute of Physics, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
A ≥ 220, electromagnetic transitions, nuclear structure & decays, Nuclear Physics - Experiment, radon, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ydinfysiikka, 114 Physical sciences
Abstract

International audience; The nature of quadrupole and octupole collectivity in $^{222}$Rn was investigated by determining the electric-quadrupole (E2) and octupole (E3) matrix elements using subbarrier, multistep Coulomb excitation. The radioactive $^{222}$Rn beam, accelerated to 4.23 MeV/u, was provided by the HIE-ISOLDE facility at CERN. Data were collected in the Miniball $\gamma$ -ray spectrometer following the bombardment of two targets, $^{120}$Sn and $^{60}$Ni. Transition E2 matrix elements within the ground-state and octupole bands were measured up to 10 ¯h and the results were consistent with a constant intrinsic electric-quadrupole moment, 518(11) $e$ fm$^2$ . The values of the intrinsic electric-octupole moment for the $0^+ \to 3^-$ and $2^+ \to 5^-$ transitions were found to be respectively $2360^{+300}_{-210}$ $e$ fm$_3$ and $2300^{+300}_{-500}$ $e$ fm$^3$ while a smaller value, $1200^{+500}_{-900}$ $e$ fm$^3$ , was found for the $2^+ \to 1^-$ transition. In addition, four excited non-yrast states were identified in this work via γ -γ coincidences.

Published
2022
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19. 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

20. New ß-decaying state in 214Bi

Author

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

Published
2021

21. New β-decaying state in 214Bi

Author

Andel, B., Van Duppen, P., Andreyev, A. N., Blazhev, A., Grawe, H., Licǎ, R., Naïdja, H., Stryjczyk, M., Algora, A., Antalic, S., Barzakh, A., Benito, J., Benzoni, G., Berry, T., Borge, M. J.G., Chrysalidis, K., Clisu, C., Costache, C., Cubiss, J. G., De Witte, H., Fedorov, D. V., Fedosseev, V. N., Fraile, L. M., Fynbo, Hans Otto Uldall, Greenlees, P. T., Harkness-Brennan, L. J., Huyse, M., Illana, A., Jolie, J., Judson, D. S., Konki, J., Lazarus, I., Madurga, M., Marginean, N., Marginean, R., Mihai, C., Marsh, B. A., Molkanov, P., Mosat, P., Murias, J. R., Nacher, E., Negret, A., Page, R. D., Pascu, S., Perea, A., Pucknell, V., Rahkila, P., Rapisarda, E., Rezynkina, K., and Sánchez-Tembleque, V.

Abstract

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.

Published
2021
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22. 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

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

Author

IDS Collaboration, Piersa-Silkowska, M., Greenlees, P. T., Konki, J., Ojala, J., Pakarinen, J., Rahkila, P., Stryjczyk, M., and Helsinki Institute of Physics

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Nuclear Experiment, 114 Physical sciences
Abstract

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

Published
2021

24. First β-decay spectroscopy of $^{135}$In and new $β$-decay branches of $^{134}$In

Author

Piersa-Siłkowska, M., Korgul, A., Benito, J., Fraile, L.M., 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., 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., Johnston, K., Jolie, J., Judson, D.S., Karanyonchev, V., Kicińska-Habior, M., Konki, J., Koszuk, Ł., Kurcewicz, J., Lazarus, I., Lică, R., López-Montes, A., Mach, H., Madurga, M., Marroquín, I., Marsh, B., Martínez, M.C., Mazzocchi, C., Miernik, K., Mihai, C., Mărginean, N., Mărginean, R., Negret, A., Nácher, E., Ojala, J., Olaizola, B., Page, R.D., Pakarinen, J., Pascu, S., Paulauskas, S.V., Perea, A., Pucknell, V., Rahkila, P., Raison, C., Rapisarda, E., Rezynkina, K., Rotaru, F., Rothe, S., Rykaczewski, K.P., Régis, J.-M., Schomacker, K., Siłkowski, M., Simpson, G., Sotty, C., Stan, L., Stănoiu, M., Stryjczyk, M., Sánchez-Parcerisa, D., Sánchez-Tembleque, V., Tengblad, O., Turturică, A., Udías, J.M., Van Duppen, P., Vedia, V., Villa, A., Viñals, S., Wadsworth, R., Walters, W.B., Warr, N., Wilkins, S.G., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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 ), Université Grenoble Alpes (UGA), and IDS

Subjects
isotoopit, mittaus, Astrophysics::High Energy Astrophysical Phenomena, spektroskopia, Nuclear Theory, Nuclear Physics - Experiment, neutronit, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], fysiikka, ydinfysiikka, Nuclear Experiment
Abstract

International audience; The $\beta$ decay of the neutron-rich $^{134}$In and $^{135}$In was investigated experimentally in order to provide new insights into the nuclear structure of the tin isotopes with magic proton number $Z=50$ above the $N=82$ shell. The $\beta$-delayed $\gamma$-ray spectroscopy measurement was performed at the ISOLDE facility at CERN, where indium isotopes were selectively laser-ionized and on-line mass separated. Three $\beta$-decay branches of $^{134}$In were established, two of which were observed for the first time. Population of neutron-unbound states decaying via $\gamma$ rays was identified in the two daughter nuclei of $^{134}$In, $^{134}$Sn and $^{133}$Sn, at excitation energies exceeding the neutron separation energy by 1 MeV. The $\beta$-delayed one- and two-neutron emission branching ratios of $^{134}$In were determined and compared with theoretical calculations. The $\beta$-delayed one-neutron decay was observed to be dominant $\beta$-decay branch of $^{134}$In even though the Gamow-Teller resonance is located substantially above the two-neutron separation energy of $^{134}$Sn. Transitions following the $\beta$ decay of $^{135}$In are reported for the first time, including $\gamma$ rays tentatively attributed to $^{135}$Sn. In total, six new levels were identified in $^{134}$Sn on the basis of the $\beta \gamma \gamma$ coincidences observed in the $^{134}$In and $^{135}$In $\beta$ decays. A transition that might be a candidate for deexciting the missing neutron single-particle $13/2^+$ state in $^{133}$Sn was observed in both $\beta$ decays and its assignment is discussed. Experimental level schemes of $^{134}$Sn and $^{135}$Sn are compared with shell-model predictions. Using the fast timing technique, half-lives of the $2^+$, $4^+$ and $6^+$ levels in $^{134}$Sn were determined.

Published
2021
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25. New $\beta$-decaying state in $^{214}$Bi

Author

Andel, B., Van Duppen, P., Andreyev, A.N., Blazhev, A., Grawe, H., Lică, R., Naïdja, H., Stryjczyk, M., Algora, A., Antalic, S., Barzakh, A., Benito, J., Benzoni, G., Berry, T., Borge, M.J.G., Chrysalidis, K., Clisu, C., Costache, C., Cubiss, J.G., De Witte, H., Fedorov, D.V., Fedosseev, V.N., Fraile, L.M., Fynbo, H.O.U., Greenlees, P.T., Harkness-Brennan, L.J., Huyse, M., Illana, A., Jolie, J., Judson, D.S., Konki, J., Lazarus, I., Madurga, M., Marginean, N., Marginean, R., Mihai, C., Marsh, B.A., Molkanov, P., Mosat, P., Murias, J.R., Nacher, E., Negret, A., Page, R.D., Pascu, S., Perea, A., Pucknell, V., Rahkila, P., Rapisarda, E., Rezynkina, K., Sánchez-Tembleque, V., Schomacker, K., Seliverstov, M.D., Sotty, C., Stan, L., Sürder, C., Tengblad, O., Vedia, V., Viñals, S., Wadsworth, R., Warr, N., Institut Laue-Langevin (ILL), ILL, Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and IDS

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

International audience; A new $\beta$-decaying state in $^{214}$Bi has been identified at the ISOLDE Decay Station at the CERN-ISOLDE facility. A preferred $I^{\pi} = (8^-)$ assignment was suggested for this state based on the β-decay feeding pattern to levels in $^{214}$Po and shell-model calculations. The half-life of the $I^{\pi} = (8^-)$ state was deduced to be $T_{1/2} = 9.39(10)$ min. The deexcitation of the levels populated in $^{214}$Po by the $\beta$ decay of this state was investigated via $\gamma - \gamma$ coincidences and a number of new levels and transitions was identified. Shell-model calculations for excited states in $^{214}$Bi and $^{214}$Po 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 $I^{\pi} = 8^-$ isomer and allow for tentative assignment of shell-model states to several high-spin states in $^{214}$Po.

Published
2021
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26. The observation of vibrating pear-shapes in radon nuclei (vol 10, 2473, 2019)

Author

Butler, PA, Gaffney, LP, Spagnoletti, P, Konki, J, Scheck, M, Smith, JF, Abrahams, K, Bowry, M, Cederkaell, J, Chupp, T, de Angelis, G, De Witte, H, Garrett, PE, Goldkuhle, A, Henrich, C, Illana, A, Johnston, K, Joss, DT, Keatings, JM, Kelly, NA, Komorowska, M, Kroell, T, Lozano, M, Singh, BS Nara, O'Donnell, D, Ojala, J, Page, RD, Pedersen, LG, Raison, C, Reiter, P, Rodriguez, JA, Rosiak, D, Rothe, S, Shneidman, TM, Siebeck, B, Seidlitz, M, Sinclair, J, Stryjczyk, M, Van Duppen, P, Vinals, S, Virtanen, V, Warr, N, Wrzosek-Lipska, K, and Zielinska, M

Published
2020

27. 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., 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, C., Tengblad, O., Vedia, V., Viñals, S., Wadsworth, R., Warr, N., and Wrzosek-Lipska, K.

Subjects
High Energy Physics::Experiment
Abstract

Decay spectroscopy of the long-lived states in Tl186 has been performed at the ISOLDE Decay Station at ISOLDE, CERN. The α decay from the low-spin (2-) state in Tl186 was observed for the first time and a half-life of 3.4-0.4+0.5 s was determined. Based on the α-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 Tl186(10(-)) state [T1/2=3.40(9) s], which was known to decay solely through emission of 374-keV γ-ray transition, was extended and a lower limit for the β-decay branching bβ>5.9(3)% was determined. The extracted retardation factors for the γ decay of the 10(-) state were compared to the available data in neighboring odd-odd thallium isotopes indicating the importance of the πd3/2 shell in the isomeric decay and significant structure differences between Tl184 and Tl186.

Published
2020
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28. The observation of vibrating pear-shapes in radon nuclei (vol 10, pg 2473, 2020)

Author

Butler, PA, Gaffney, LP, Spagnoletti, P, Konki, J, Scheck, M, Smith, JF, Abrahams, K, Bowry, M, Cederkaell, J, Chupp, T, de Angelis, G, De Witte, H, Garrett, PE, Goldkuhle, A, Henrich, C, Illana, A, Johnston, K, Joss, DT, Keatings, JM, Kelly, NA, Komorowska, M, Kroell, T, Lozano, M, Singh, BS Nara, O'Donnell, D, Ojala, J, Page, RD, Pedersen, LG, Raison, C, Reiter, P, Rodriguez, JA, Rosiak, D, Rothe, S, Shneidman, TM, Siebeck, B, Seidlitz, M, Sinclair, J, Stryjczyk, M, Van Duppen, P, Vinals, S, Virtanen, V, Warr, N, Wrzosek-Lipska, K, and Zielinska, M

Published
2020

29. Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive $^{222}\mathrm{Ra}$ and $^{228}\mathrm{Ra}$ Beams

Author

Butler, P.A., Gaffney, L.P., Spagnoletti, P., Abrahams, K., Bowry, M., Cederkäll, J., De Angelis, G., De Witte, H., Garrett, P.E., Goldkuhle, A., Henrich, C., Illana, A., Johnston, K., Joss, D.T., Keatings, J.M., Kelly, N.A., Komorowska, M., Konki, J., Kröll, T., Lozano, M., Nara Singh, B.S., O'Donnell, D., Ojala, J., Page, R.D., Pedersen, L.G., Raison, C., Reiter, P., Rodriguez, J.A., Rosiak, D., Rothe, S., Scheck, M., Seidlitz, M., Shneidman, T.M., Siebeck, B., Sinclair, J., Smith, J.F., Stryjczyk, M., Van Duppen, P., Vinals, S., Virtanen, V., Warr, N., Wrzosek-Lipska, K., Zielińska, M., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
CERN Lab, nucl-th, Nuclear Theory, Other Fields of Physics, deformation, hep-ph, beam: radioactivity, stability, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, physics.atom-ph, rotation, nucleus: transition, Nuclear Physics - Theory, correlation, excited state, Physics::Accelerator Physics, Nuclear Physics - Experiment, Coulomb, Physics::Atomic Physics, Nuclear Experiment, radium: nucleus, Particle Physics - Phenomenology, Nuclear Physics
Abstract

There is sparse direct experimental evidence that atomic nuclei can exhibit stable pear shapes arising from strong octupole correlations. In order to investigate the nature of octupole collectivity in radium isotopes, electric octupole ($E3$) matrix elements have been determined for transitions in $^{222,228}$Ra nuclei using the method of sub-barrier, multi-step Coulomb excitation. Beams of the radioactive radium isotopes were provided by the HIE-ISOLDE facility at CERN. The observed pattern of $E$3 matrix elements for different nuclear transitions is explained by describing $^{222}$Ra as pear-shaped with stable octupole deformation, while $^{228}$Ra behaves like an octupole vibrator. There is sparse direct experimental evidence that atomic nuclei can exhibit stable pear shapes arising from strong octupole correlations. In order to investigate the nature of octupole collectivity in radium isotopes, electric octupole ($E3$) matrix elements have been determined for transitions in $^{222,228}$Ra nuclei using the method of sub-barrier, multi-step Coulomb excitation. Beams of the radioactive radium isotopes were provided by the HIE-ISOLDE facility at CERN. The observed pattern of $E$3 matrix elements for different nuclear transitions is explained by describing $^{222}$Ra as pear-shaped with stable octupole deformation, while $^{228}$Ra behaves like an octupole vibrator.

Published
2020
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30. Decay studies of the long-lived states in Tl186

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, C., Tengblad, O., Vedia, V., Viñals, S., Wadsworth, R., Warr, N., and Wrzosek-Lipska, K.

Subjects
lifetimes and widths, alpha decay, electromagnetic transitions, High Energy Physics::Experiment, isomer decays, ydinfysiikka, nuclear structure and decays
Abstract

Decay spectroscopy of the long-lived states in 186Tl has been performed at the ISOLDE Decay Station at ISOLDE, CERN. The α decay from the low-spin (2−) state in 186Tl was observed for the first time and a half-life of 3.4+0.5−0.4 s was determined. Based on the α-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 186Tl(10(−)) state [T1/2=3.40(9) s], which was known to decay solely through emission of 374-keV γ-ray transition, was extended and a lower limit for the β-decay branching bβ>5.9(3)% was determined. The extracted retardation factors for the γ decay of the 10(−) state were compared to the available data in neighboring odd-odd thallium isotopes indicating the importance of the πd3/2 shell in the isomeric decay and significant structure differences between 184Tl and 186Tl. peerReviewed

Published
2020

31. Fine structure in the alpha decay of $^218At$

Author

Cubiss, J. G., Andreyev, A. N., Barzakh, A. E., Andel, B., Antalic, S., Cocolios, T. E., Goodacre, T. Day, Fedorov, D. V., Fedosseev, V. N., Ferrer, R., Fink, D. A., Gaffney, L. P., Ghys, L., Huyse, M., Kalaninová, Z., Köster, U., Marsh, B. A., Molkanov, P. L., Rossel, R. E., Rothe, S., Seliverstov, M. D., Sels, S., Sjödin, A. M., Stryjczyk, M., L.Truesdale, V., Van Beveren, C., Van Duppen, P., and Wilson, G. L.

Published
2019

32. Fine structure in the alpha decay of At-218

Author

Cubiss, JG, Andreyev, AN, Barzakh, AE, Andel, B, Antalic, S, Cocolios, TE, Goodacre, T Day, Fedorov, DV, Fedosseev, VN, Ferrer, R, Fink, DA, Gaffney, LP, Ghys, L, Huyse, M, Kalaninova, Z, Koster, U, Marsh, BA, Molkanov, PL, Rossel, RE, Rothe, S, Seliverstov, MD, Sels, S, Sjodin, AM, Stryjczyk, M, Truesdale, VL, Van Beveren, C, Van Duppen, P, and Wilson, GL

Published
2019

33. $\beta$ 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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34. Fine structure in the $\alpha$ decay of $^{218}\mathrm{At}$

Author

Cubiss, J.G., Andreyev, A.N., Barzakh, A.E., Andel, B., Antalic, S., Cocolios, T.E., Day Goodacre, T., Fedorov, D.V., Fedosseev, V.N., Ferrer, R., Fink, D.A., Gaffney, L.P., Ghys, L., Huyse, M., Kalaninová, Z., Köster, U., Marsh, B.A., Molkanov, P.L., Rossel, R.E., Rothe, S., Seliverstov, M.D., Sels, S., Sjödin, A.M., Stryjczyk, M., L.Truesdale, V., Van Beveren, C., Van Duppen, P., Wilson, G.L., Institut Laue-Langevin (ILL), and ILL

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

International audience; An α-decay study of At218 was performed at the CERN-ISOLDE facility. Laser-ionized beams of At218 were mass separated and implanted into an α-γ detection setup. Coincidence α-γ data were collected for the first time and a more precise half-life value of T1/2=1.27(6) s was measured. A new α-decay scheme was deduced based on the extracted reduced α-decay widths for fine-structure decays. The results from this work lead to a preferred spin and parity assignment of Jπ=(3−); however, Jπ=(2)− cannot be fully excluded.

Published
2019
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35. $\beta^-$ decay study of the $^{66}$Mn - $^{66}$Fe - $^{66}$Co - $^{66}$Ni chain

Author

Stryjczyk, M., Tsunoda, Y., Darby, I. G., De Witte, H., Diriken, J., Fedorov, D. V., Fedosseev, V. N., Fraile, L. M., Huyse, M., Köster, U., Marsh, B. A., Otsuka, T., Pauwels, D., Popescu, L., Radulov, D., Seliverstov, M. D., Sjödin, A. M., Bergh, P. Van den, Van Duppen, P., Venhart, M., Walters, W. B., and Wimmer, K.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Background: Shell evolution can impact the structure of the nuclei and lead to effects such as shape coexistence. The nuclei around $^{68}$Ni represent an excellent study case, however, spectroscopic information of the neutron-rich, $Z, Comment: accepted for publication in PRC

Published
2018

36. $\beta^-$ decay study of the $^{66}$Mn $-$ $^{66}$Fe $-$ $^{66}$Co $-$ $^{66}$Ni decay chain

Author

Stryjczyk, M., Tsunoda, Y., Darby, I.G., De Witte, H., Diriken, J., Fedorov, D.V., Fedosseev, V.N., Fraile, L.M., Huyse, M., Köster, U., Marsh, B.A., Otsuka, T., Pauwels, D., Popescu, L., Radulov, D., Seliverstov, M.D., Sjödin, A.M., Van Den Bergh, P., Van Duppen, P., Venhart, M., Walters, W.B., Wimmer, K., Institut Laue-Langevin (ILL), and ILL

Subjects
nucl-th, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Physics - Theory, Nuclear Physics - Experiment, 23.20.Lv, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, Nuclear Structure, 27.50.+e, 23.40.-s
Abstract

Background: Shell evolution can impact the structure of the nuclei and lead to effects such as shape coexistence. The nuclei around Ni68 represent an excellent study case, however, spectroscopic information of the neutron-rich, Z

Published
2018
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37. Fine structure in the α decay of 218At

Author

Cubiss, JG, Andreyev, AN, Barzakh, AE, Andel, B, Antalic, S, Cocolios, TE, Goodacre, TD, Fedorov, DV, Fedosseev, VN, Ferrer Garcia, R, Fink, DA, Gaffney, LP, Ghys, L, Huyse, M, Kalaninová, Z, Köster, U, Marsh, BA, Molkanov, PL, Rossel, RE, Rothe, S, Seliverstov, MD, Sels, S, Sjödin, AM, Stryjczyk, M, L.Truesdale, V, Van Beveren, C, Van Duppen, P, and Wilson, GL

Abstract

An α-decay study of 218At was performed at the CERN-ISOLDE facility. Laser-ionized beams of 218At were mass separated and implanted into an α−γ detection setup. Coincidence α−γ data were collected for the first time and a more precise half-life value of T1/2=1.27(6) s was measured. A new α-decay scheme was deduced based on the extracted reduced α-decay widths for fine-structure decays. The results from this work lead to a preferred spin and parity assignment of Jπ=(3−); however, Jπ=(2)− cannot be fully excluded.

Published
2019

38. β− decay study of the 66M-66Fe-66Co-66Ni decay chain

Author

Stryjczyk, M., Tsunoda, Y., Darby, I.G., De Witte, H., Diriken, J., Fedorov, D.V., Fedosseev, V.N., Fraile, L.M., Huyse, M., Köster, U., Marsh, B.A., Otsuka, T., Pauwels, D., Popescu, L., Radulov, D., Seliverstov, M.D., Sjödin, A.M., Van den Bergh, P., Van Duppen, P., Venhart, M., Walters, W.B., and Wimmer, K.

Abstract

Background: Shell evolution can impact the structure of the nuclei and lead to effects such as shape coexistence. The nuclei around 68Ni represent an excellent study case, however, spectroscopic information of the neutron-rich, Z

Published
2018

39. β- decay study of the 66Mn-66Fe-66Co-66Ni decay chain.

Author

Stryjczyk, M., Tsunoda, Y., Darby, I. G., De Witte, H., Diriken, J., Fedorov, D. V., Fedosseev, V. N., Fraile, L. M., Huyse, M., Köster, U., Marsh, B. A., Otsuka, T., Pauwels, D., Popescu, L., Radulov, D., Seliverstov, M. D., Sjödin, A. M., Van den Bergh, P., Van Duppen, P., and Venhart, M.

Subjects
*BETA decay, *NEUTRONS, *NUCLEAR structure
Abstract

Background: Shell evolution can impact the structure of the nuclei and lead to effects such as shape coexistence. The nuclei around 68Ni represent an excellent study case, however, spectroscopic information of the neutron-rich, Z<28 nuclei is limited. Purpose: The goal is to measure γ-ray transitions in 66Fe,66Co, and 66Ni populated in the β- decay of 66Mn to determine absolute β feedings and relative γ-decay probabilities and to compare the results with Monte Carlo shell model calculations in order to study the influence of the relevant single neutron and proton orbital occupancies around Z=28 and N=40. Method: The low-energy structures of 65,66Fe,66Co, and 66Ni were studied in the β- decay of 66Mn produced at ISOLDE, CERN. The beam was purified by means of laser resonance ionization and mass separation. The β and γ events detected by three plastic scintillators and two MiniBall cluster germanium detectors, respectively, were correlated in time to build the low-energy excitation schemes and to determine the β-decay half-lives of the nuclei. Results: The relative small β-decay ground state feeding of 66Fe obtained in this work is at variant to the earlier studies. Spin and parity 1+ was assigned to the 66Co ground state based on the strong ground-state feeding in the decay of 66Fe as well as in the decay of 66Co. Experimental log(ft) values, γ-ray de-excitation patterns, and energies of excited states were compared to Monte Carlo shell model calculations. Based on this comparison, spin and parity assignments for the selected number of low-lying states in the 66Mn to 66Ni chain were proposed. Conclusions: The β-decay chain starting 66Mn toward 66Ni, crossing N=40, evolves from deformed nuclei to sphericity. The β-decay population of a selected number of 0+ and 2+ states in 66Ni, which is understood within shape coexistence framework of Monte Carlo shell model calculations, reveals the crucial role of the neutron 0g9/2 shell and proton excitations across the Z=28 gap. [ABSTRACT FROM AUTHOR]

Published
2018
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40. 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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41. First β -decay spectroscopy of In 135 and new β -decay branches of In 134

Author

Piersa-Siłkowska, M., Korgul, A., Benito, J., Fraile, L. M., 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., 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., Johnston, K., Jolie, J., Judson, D. S., Karanyonchev, V., Kicińska-Habior, M., Konki, J., Koszuk, Ł., Kurcewicz, J., Lazarus, I., Lică, R., López-Montes, A., Mach, H., Madurga, M., Marroquín, I., Marsh, B., Martínez, M. C., Mazzocchi, C., Miernik, K., Mihai, C., Mărginean, N., Mărginean, R., Negret, A., Nácher, E., Ojala, J., Olaizola, B., Page, R. D., Pakarinen, J., Pascu, S., Paulauskas, S. V., Perea, A., Pucknell, V., Rahkila, P., Raison, C., Rapisarda, E., Rezynkina, K., Rotaru, F., Rothe, S., Rykaczewski, K. P., Régis, J.-M., Schomacker, K., Siłkowski, M., Simpson, G., Sotty, C., Stan, L., Stănoiu, M., Stryjczyk, M., Sánchez-Parcerisa, D., Sánchez-Tembleque, V., Tengblad, O., Turturică, A., Udías, J. M., Van Duppen, P., Vedia, V., Villa, A., Viñals, S., Wadsworth, R., Walters, W. B., Warr, N., and Wilkins, S. G.

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

Author

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

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43. Experimental study of the β decay of the very neutron-rich nucleus 85Ge.

Author

Korgul, A., Rykaczewski, K. P., Grzywacz, R. K., Bingham, C. R., Brewer, N. T., Gross, C. J., Jost, C., Karny, M., Madurga, M., Mazzocchi, C., Mendez II, A. J., Miernik, K., Miller, D., Padgett, S., Paulauskas, S. V., Piersa, M., Stracener, D. W., Stryjczyk, M., Wolińska-Cichocka, M., and Zganjar, E. F.

Subjects
*BETA decay, *NEUTRONS, *RADIOACTIVITY
Abstract

The β-decay properties of the very neutron-rich nucleus 85Ge, produced in the proton-induced fission of 238U, were studied at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. The level scheme of 8533As52 populated in 85Ge βγ decay was reconstructed and compared to shell-model calculations. The investigation of the systematics of low-energy levels in N = 52 isotones together with shell-model analysis allowed us to provide an estimate of the low-energy structure of the more exotic N = 52 isotone 81Cu. [ABSTRACT FROM AUTHOR]

Published
2017
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44. β and β-n decay of the neutron-rich 84Ge nucleus.

Author

Korgul, A., Rykaczewski, K. P., Grzywacz, R. K., Bingham, C. R., Brewer, N. T., Gross, C. J., Ciemny, A. A., Jost, C., Karny, M., Madurga, M., Mazzocchi, C., Mendez II, A. J., Miernik, K., Miller, D., Padgett, S., Paulauskas, S. V., Piersa, M., Stracener, D. W., Stryjczyk, M., and Wolińska-Cichocka, M.

Subjects
*GERMANIUM compounds, *NEUTRONS, *RADIOACTIVE nuclear beams
Abstract

The β-decay properties of the very neutron-rich 84Ge nucleus were studied at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. Several new γ-transitions and levels were added to its decay scheme and the order of the two lowest-lying levels in the daughter 84As was corrected. For the first time γ radiation following β-delayed neutron emission was observed. The shell-model calculations and apparent β transition intensities were used to guide the spin assignment to the 84As levels, in particular for the low-energy part of the level scheme. The new spin-parity (2-) proposed for the ground state of 84As is supported also by the systematics of N=51 isotones. [ABSTRACT FROM AUTHOR]

Published
2016
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45. High-Precision Mass Measurements of Neutron Deficient Silver Isotopes Probe the Robustness of the N=50 Shell Closure.

Author

Ge Z, Reponen M, Eronen T, Hu B, Kortelainen M, Kankainen A, Moore I, Nesterenko D, Yuan C, Beliuskina O, Cañete L, de Groote R, Delafosse C, Dickel T, de Roubin A, Geldhof S, Gins W, Holt JD, Hukkanen M, Jaries A, Jokinen A, Koszorús Á, Kripkó-Koncz G, Kujanpää S, Lam YH, Nikas S, Ortiz-Cortes A, Penttilä H, Pitman-Weymouth D, Plaß W, Pohjalainen I, Raggio A, Rinta-Antila S, Romero J, Stryjczyk M, Vilen M, Virtanen V, and Zadvornaya A

Abstract

High-precision mass measurements of exotic ^{95-97}Ag isotopes close to the N=Z line have been conducted with the JYFLTRAP double Penning trap mass spectrometer, with the silver ions produced using the recently commissioned inductively heated hot cavity catcher laser ion source at the Ion Guide Isotope Separator On-Line facility. The atomic mass of ^{95}Ag was directly determined for the first time. In addition, the atomic masses of β-decaying 2^{+} and 8^{+} states in ^{96}Ag have been identified and measured for the first time, and the precision of the ^{97}Ag mass has been improved. The newly measured masses, with a precision of ≈1  keV/c^{2}, have been used to investigate the N=50 neutron shell closure, confirming it to be robust. Empirical shell-gap and pairing energies determined with the new ground-state mass data are compared with the state-of-the-art ab initio calculations with various chiral effective field theory Hamiltonians. The precise determination of the excitation energy of the ^{96m}Ag isomer in particular serves as a benchmark for ab initio predictions of nuclear properties beyond the ground state, specifically for odd-odd nuclei situated in proximity to the proton dripline below ^{100}Sn. In addition, density functional theory calculations and configuration-interaction shell-model calculations are compared with the experimental results. All theoretical approaches face challenges to reproduce the trend of nuclear ground-state properties in the silver isotopic chain across the N=50 neutron shell and toward the proton dripline.

Published
2024
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46. Nuclear Charge Radius of ^{26m}Al and Its Implication for V&#95;{ud} in the Quark Mixing Matrix.

Author

Plattner P, Wood E, Al Ayoubi L, Beliuskina O, Bissell ML, Blaum K, Campbell P, Cheal B, de Groote RP, Devlin CS, Eronen T, Filippin L, Garcia Ruiz RF, Ge Z, Geldhof S, Gins W, Godefroid M, Heylen H, Hukkanen M, Imgram P, Jaries A, Jokinen A, Kanellakopoulos A, Kankainen A, Kaufmann S, König K, Koszorús Á, Kujanpää S, Lechner S, Malbrunot-Ettenauer S, Müller P, Mathieson R, Moore I, Nörtershäuser W, Nesterenko D, Neugart R, Neyens G, Ortiz-Cortes A, Penttilä H, Pohjalainen I, Raggio A, Reponen M, Rinta-Antila S, Rodríguez LV, Romero J, Sánchez R, Sommer F, Stryjczyk M, Virtanen V, Xie L, Xu ZY, Yang XF, and Yordanov DT

Abstract

Collinear laser spectroscopy was performed on the isomer of the aluminium isotope ^{26m}Al. The measured isotope shift to ^{27}Al in the 3s^{2}3p ^{2}P&#95;{3/2}^{○}→3s^{2}4s ^{2}S&#95;{1/2} atomic transition enabled the first experimental determination of the nuclear charge radius of ^{26m}Al, resulting in R&#95;{c}=3.130(15)  fm. This differs by 4.5 standard deviations from the extrapolated value used to calculate the isospin-symmetry breaking corrections in the superallowed β decay of ^{26m}Al. Its corrected Ft value, important for the estimation of V&#95;{ud} in the Cabibbo-Kobayashi-Maskawa matrix, is thus shifted by 1 standard deviation to 3071.4(1.0) s.

Published
2023
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47. Further Evidence for Shape Coexistence in ^{79}Zn^{m} near Doubly Magic ^{78}Ni.

Author

Nies L, Canete L, Dao DD, Giraud S, Kankainen A, Lunney D, Nowacki F, Bastin B, Stryjczyk M, Ascher P, Blaum K, Cakirli RB, Eronen T, Fischer P, Flayol M, Girard Alcindor V, Herlert A, Jokinen A, Khanam A, Köster U, Lange D, Moore ID, Müller M, Mougeot M, Nesterenko DA, Penttilä H, Petrone C, Pohjalainen I, de Roubin A, Rubchenya V, Schweiger C, Schweikhard L, Vilen M, and Äystö J

Abstract

Isomers close to doubly magic &#95;{28}^{78}Ni&#95;{50} provide essential information on the shell evolution and shape coexistence near the Z=28 and N=50 double shell closure. We report the excitation energy measurement of the 1/2^{+} isomer in &#95;{30}^{79}Zn&#95;{49} through independent high-precision mass measurements with the JYFLTRAP double Penning trap and with the ISOLTRAP multi-reflection time-of-flight mass spectrometer. We unambiguously place the 1/2^{+} isomer at 942(10) keV, slightly below the 5/2^{+} state at 983(3) keV. With the use of state-of-the-art shell-model diagonalizations, complemented with discrete nonorthogonal shell-model calculations which are used here for the first time to interpret shape coexistence, we find low-lying deformed intruder states, similar to other N=49 isotones. The 1/2^{+} isomer is interpreted as the bandhead of a low-lying deformed structure akin to a predicted low-lying deformed band in ^{80}Zn, and points to shape coexistence in ^{79,80}Zn similar to the one observed in ^{78}Ni. The results make a strong case for confirming the claim of shape coexistence in this key region of the nuclear chart.

Published
2023
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48. Large Shape Staggering in Neutron-Deficient Bi Isotopes.

Author

Barzakh A, Andreyev AN, Raison C, Cubiss JG, Van Duppen P, Péru S, Hilaire S, Goriely S, Andel B, Antalic S, Al Monthery M, Berengut JC, Bieroń J, Bissell ML, Borschevsky A, Chrysalidis K, Cocolios TE, Day Goodacre T, Dognon JP, Elantkowska M, Eliav E, Farooq-Smith GJ, Fedorov DV, Fedosseev VN, Gaffney LP, Garcia Ruiz RF, Godefroid M, Granados C, Harding RD, Heinke R, Huyse M, Karls J, Larmonier P, Li JG, Lynch KM, Maison DE, Marsh BA, Molkanov P, Mosat P, Oleynichenko AV, Panteleev V, Pyykkö P, Reitsma ML, Rezynkina K, Rossel RE, Rothe S, Ruczkowski J, Schiffmann S, Seiffert C, Seliverstov MD, Sels S, Skripnikov LV, Stryjczyk M, Studer D, Verlinde M, Wilman S, and Zaitsevskii AV

Abstract

The changes in the mean-square charge radius (relative to ^{209}Bi), magnetic dipole, and electric quadrupole moments of ^{187,188,189,191}Bi were measured using the in-source resonance-ionization spectroscopy technique at ISOLDE (CERN). A large staggering in radii was found in ^{187,188,189}Bi^{g}, manifested by a sharp radius increase for the ground state of ^{188}Bi relative to the neighboring ^{187,189}Bi^{g}. A large isomer shift was also observed for ^{188}Bi^{m}. Both effects happen at the same neutron number, N=105, where the shape staggering and a similar isomer shift were observed in the mercury isotopes. Experimental results are reproduced by mean-field calculations where the ground or isomeric states were identified by the blocked quasiparticle configuration compatible with the observed spin, parity, and magnetic moment.

Published
2021
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49. Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive ^{222}Ra and ^{228}Ra Beams.

Author

Butler PA, Gaffney LP, Spagnoletti P, Abrahams K, Bowry M, Cederkäll J, de Angelis G, De Witte H, Garrett PE, Goldkuhle A, Henrich C, Illana A, Johnston K, Joss DT, Keatings JM, Kelly NA, Komorowska M, Konki J, Kröll T, Lozano M, Nara Singh BS, O'Donnell D, Ojala J, Page RD, Pedersen LG, Raison C, Reiter P, Rodriguez JA, Rosiak D, Rothe S, Scheck M, Seidlitz M, Shneidman TM, Siebeck B, Sinclair J, Smith JF, Stryjczyk M, Van Duppen P, Vinals S, Virtanen V, Warr N, Wrzosek-Lipska K, and Zielińska M

Abstract

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

Published
2020
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