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Direct evidence of Be as an amphoteric dopant in GaN / Wahl, U. ; Correia, J. G. ; Costa, A. R. G. ; Lima, T. A. L. ; Moens, J. ; Kappers, M. J. ; da Silva, M. R. ; Pereira, L. M. C. ; Vantomme, A. /IS634 Collaboration
The interest in Be as an impurity in GaN stems from the challenge to understand why GaN can be doped p type with Mg, while this does not work for Be. While theory has actually predicted an acceptor level for Be that is shallower than Mg, it was also argued that Be is not a suitable acceptor because its am-photeric nature, i.e. [...]
- Published in : Physical Review B105 (2022) 184112 Postprint from Phys. Rev. B 105 (2022) 184112: PDF; Supplemental Material from Phys. Rev. B 105 (2022) 184114: PDF;

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Yttrium Oxide Freeze-Casts: Target Materials for Radioactive Ion Beams / Kröll, Eva (U. Duisburg-Essen) ; Vadalà, Miriana (U. Duisburg-Essen) ; Schell, Juliana (U. Duisburg-Essen ; CERN) ; Stegemann, Simon (CERN) ; Ballof, Jochen (CERN) ; Rothe, Sebastian (CERN) ; Lupascu, Doru C (U. Duisburg-Essen)
Highly porous yttrium oxide is fabricated as ion beam target material in order to produce radioactive ion beams via the Isotope Separation On Line (ISOL) method. Freeze casting allows the formation of an aligned pore structure in these target materials to improve the isotope release. Aqueous suspensions containing a solid loading of 10, 15, and 20 vol% were solidified with a unidirectional freeze-casting setup. [...]
2021 - 12 p. - Published in : Materials 14 (2021) 2864

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Decay modes of the $9/2^-$ isomeric state in $^{183}$Tl / Venhart, M (Bratislava, Inst. Phys.) ; Andreyev, A N (JAERI, Tokai ; York U., England) ; Cubiss, J G (York U., England) ; Wood, J L (Georgia Tech., Atlanta) ; Barzakh, A E (St. Petersburg, INP) ; Van Beveren, C (Leuven U.) ; Cocolios, T E (Leuven U.) ; de Groote, R P (Leuven U.) ; Fedorov, D V (St. Petersburg, INP) ; Fedosseev, V N (CERN) et al.
The internal transition decay and α decay of the $T_{1/2} = 53.3$ ms, $9/2^-$ isomeric state in the neutron-deficient isotope, $^{183}$Tl, have been studied using the Resonance Ionization Laser Ion Source and the Windmill detection setup at the ISOLDE facility at CERN. Clean samples of $^{183}$Tl were produced by selective laser ionization and subsequent mass separation. [...]
2022 - 9 p. - Published in : Phys. Rev. C 105 (2022) 034338 Fulltext: PDF;

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Radio-frequency waveform investigation for ion transport within the RFQcb at ISOLDE's Offline 2 facility / Warren, S (CERN) ; Giles, T (CERN)
A theoretical and practical investigation into the relation of applied waveform, voltage, and frequency of the quadrupole potential applied to the Radio-Frequency Quadrupole cooler and buncher (RFQcb) used at the ISOLDE facility and the Offline 2 facility. Non-radioactive ion beams were transported through the RFQcb over a range of quadrupole parameters to quantify beam transport efficiency via pre and post beam current measurements. [...]
2021 - 18 p. - Published in : JINST 16 (2021) P07058 Fulltext: PDF;

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Producing gold at ISOLDE-CERN / Barzakh, A E (St. Petersburg, INP) ; Andreyev, A N (York U., England ; JAERI, Tokai) ; Atanasov, D (Heidelberg, Max Planck Inst.) ; Cubiss, J G (York U., England) ; Harding, R D (York U., England ; CERN) ; Al Monthery, M (York U., England) ; Althubiti, N A (Manchester U. ; Al Jouf U.) ; Andel, B (Comenius U. ; Leuven U.) ; Antalic, S (Comenius U.) ; Ballof, J (CERN ; Mainz U., Inst. Kernchem.) et al.
The yield of 18 ion beams of radioactive gold nuclei produced in the thick uranium target at ISOLDE (CERN) by 1.4-GeV protons was measured. The production-efficiency dependence on the half-life (efficiency curve) was derived using the in-target production calculations by the FLUKA-CERN code. [...]
2022 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., B 513 (2022) 26-32

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A miniaturized low-power SiPM-based β detector for the ISOLDE Fast Tapestation / Neacşu, Cătălin (Bucharest, Polytechnic Inst. ; Bucharest, IFIN-HH) ; Lică, Răzvan (CERN ; Bucharest, IFIN-HH) ; Pascovici, George (Bucharest, IFIN-HH) ; Mihai, Constantin (Bucharest, IFIN-HH) ; Rothe, Sebastian (CERN)
We report on the development of a miniaturized Silicon Photomultiplier (SiPM)-based β detector aimed as an upgrade of the newly commissioned Fast Tapestation at CERN-ISOLDE, dedicated for online radioisotope production measurements. The detector consists of a thin 3 mm plastic scintillator coupled to a custom 3 × 3 array of 6×6mm2 sized SiPM cells in a signal-driven multiplexer configuration. [...]
2022 - Published in : Nucl. Instrum. Methods Phys. Res., A 1026 (2022) 166213

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Study of radial motion phase advance during motion excitations in a Penning trap and accuracy of JYFLTRAP mass spectrometer / Nesterenko, D.A. (Jyvaskyla U.) ; Eronen, T. (Jyvaskyla U.) ; Ge, Z. (Jyvaskyla U.) ; Kankainen, A. (Jyvaskyla U.) ; Vilen, M. (Jyvaskyla U. ; CERN)
Phase-imaging ion-cyclotron-resonance technique has been implemented at the Penning-trap mass spectrometer JYFLTRAP and is routinely employed for mass measurements of stable and short-lived nuclides produced at IGISOL facility. Systematic uncertainties that impose limitations on the accuracy of measurements are discussed. [...]
arXiv:2107.05631.- 2021-11-01 - 19 p. - Published in : Eur. Phys. J. A 57 (2021) 302 Fulltext: 2107.05631 - PDF; document - PDF;

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Large Shape Staggering in Neutron-Deficient Bi Isotopes / Barzakh, A (St. Petersburg, INP) ; Andreyev, A N (JAEA, Ibaraki ; York U., England) ; Raison, C (York U., England) ; Cubiss, J G (York U., England) ; Van Duppen, P (Leuven U.) ; Péru, S (CEA DAM) ; Hilaire, S (CEA DAM) ; Goriely, S (Brussels U., IAA) ; Andel, B (Comenius U.) ; Antalic, S (Comenius U.) et al.
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 $^{187,188,189}$Big, manifested by a sharp radius increase for the ground state of $^{188}$Bi relative to the neighboring $^{187,189}$Big. [...]
2021 - 7 p. - Published in : Phys. Rev. Lett. 127 (2021) 192501 Fulltext: PDF;

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Evolution of single-particle structure near the $N=20$ island of inversion / MacGregor, P T (Manchester U.) ; Sharp, D K (Manchester U.) ; Freeman, S J (Manchester U.) ; Hoffman, C R (Argonne, PHY) ; Kay, B P (Argonne, PHY) ; Tang, T L (Argonne, PHY) ; Gaffney, L P (Liverpool U. ; CERN) ; Baader, E F (CERN) ; Borge, M J G (Madrid, Inst. Estructura Materia) ; Butler, P A (Liverpool U.) et al.
The single-particle properties of $^{29}$Mg have been investigated via a measurement of the $^{28}$Mg(d,p) 29Mg reaction, in inverse kinematics, using the ISOLDE Solenoidal Spectrometer. The negative-parity intruder states from the f p shell have been identified and used to benchmark modern shell-model calculations. [...]
2021 - 7 p. - Published in : Phys. Rev. C 104 (2021) L051301 Fulltext: PDF;

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New $\beta$-decaying state in $^{214}$Bi / IDS Collaboration
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. [...]
2021 - 13 p. - Published in : Phys. Rev. C 104 (2021) 054301 Fulltext: PDF;

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