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32 results on '"Dunling, E."'

1. Collision-Induced Dissociation at TRIUMF's Ion Trap for Atomic and Nuclear science

Author

Jacobs, A., Andreoiu, C., Bergmann, J., Brunner, T., Dickel, T., Dillmann, I., Dunling, E., Flowerdew, J., Graham, L., Gwinner, G., Hockenbery, Z., Kootte, B., Lan, Y., Leach, K. G., Leistenschneider, E., Lykiardopoulou, E. M., Monier, V., Mukul, I., Paul, S. F., Plaß, W. R., Reiter, M. P., Scheidenberger, C., Thompson, R., Tracy, J. L, Will, C., Wieser, M. E., Yavor, M., Dilling, J., and Kwiatkowski, A. A.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

The performance of high-precision mass spectrometry of radioactive isotopes can often be hindered by large amounts of contamination, including molecular species, stemming from the production of the radioactive beam. In this paper, we report on the development of Collision-Induced Dissociation (CID) as a means of background reduction for experiments at TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN). This study was conducted to characterize the quality and purity of radioactive ion beams and the reduction of molecular contaminants to allow for mass measurements of radioactive isotopes to be done further from nuclear stability. This is the first demonstration of CID at an ISOL-type radioactive ion beam facility, and it is shown that molecular contamination can be reduced up to an order of magnitude., Comment: 7 pages 7 figures

Published
2022
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2. Investigating nuclear structure near $N = 32$ and $N = 34$: Precision mass measurements of neutron-rich Ca, Ti and V isotopes

Author

Porter, W. S., Dunling, E., Leistenschneider, E., Bergmann, J., Bollen, G., Dickel, T., Dietrich, K. A., Hamaker, A., Hockenbery, Z., Izzo, C., Jacobs, A., Javaji, A., Kootte, B., Lan, Y., Miskun, I., Mukul, I., Murböck, T., Paul, S. F., Plaß, W. R., Puentes, D., Redshaw, M., Reiter, M. P., Ringle, R., Ringuette, J., Sandler, R., Scheidenberger, C., Silwal, R., Simpson, R., Sumithrarachchi, C. S., Teigelhöfer, A., Valverde, A. A., Weil, R., Yandow, I. T., Dilling, J., and Kwiatkowski, A. A.

Subjects
Nuclear Experiment
Abstract

Nuclear mass measurements of isotopes are key to improving our understanding of nuclear structure across the chart of nuclides, in particular for the determination of the appearance or disappearance of nuclear shell closures. We present high-precision mass measurements of neutron-rich Ca, Ti and V isotopes performed at the TITAN and LEBIT facilities. These measurements were made using the TITAN multiple-reflection time-of-flight mass spectrometer (MR-ToF-MS) and the LEBIT 9.4T Penning trap mass spectrometer. In total, 13 masses were measured, eight of which represent increases in precision over previous measurements. These measurements refine trends in the mass surface around $N = 32$ and $N = 34$, and support the disappearance of the $N = 32$ shell closure with increasing proton number. Additionally, our data does not support the presence of a shell closure at $N = 34$., Comment: 8 pages, 6 figures

Published
2022
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3. Summit of the N=40 Island of Inversion: precision mass measurements and ab initio calculations of neutron-rich chromium isotopes

Author

Silwal, R., Andreoiu, C., Ashrafkhani, B., Bergmann, J., Brunner, T., Cardona, J., Dietrich, K., Dunling, E., Gwinner, G., Hockenbery, Z., Holt, J. D., Izzo, C., Jacobs, A., Javaji, A., Kootte, B., Lan, Y., Lunney, D., Lykiardopoulou, E. M., Miyagi, T., Mougeot, M., Mukul, I., Murbock, T., Porter, W. S., Reiter, M., Ringuette, J., Dilling, J., and Kwiatkowski, A. A.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Mass measurements continue to provide invaluable information for elucidating nuclear structure and scenarios of astrophysical interest. The transition region between the $Z = 20$ and $28$ proton shell closures is particularly interesting due to the onset and evolution of nuclear deformation as nuclei become more neutron rich. This provides a critical testing ground for emerging ab-initio nuclear structure models. Here, we present high-precision mass measurements of neutron-rich chromium isotopes using the sensitive electrostatic Multiple-Reflection Time-Of-Flight Mass Spectrometer (MR-TOF-MS) at TRIUMF's Ion Trap for Atomic and Nuclear Science (TITAN) facility. Our high-precision mass measurements of $^{59, 61-63}$Cr confirm previous results, and the improved precision in measurements of $^{64-65}$Cr refine the mass surface beyond N=40. With the ab initio in-medium similarity renormalization group, we examine the trends in collectivity in chromium isotopes and give a complete picture of the N=40 island of inversion from calcium to nickel., Comment: 12 pages, 7 figures

Published
2022
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4. Mapping the $N = 40$ Island of Inversion: Precision Mass Measurements of Neutron-rich Fe Isotopes

Author

Porter, W. S., Ashrafkhani, B., Bergmann, J., Brown, C., Brunner, T., Cardona, J. D., Curien, D., Dedes, I., Dickel, T., Dudek, J., Dunling, E., Gwinner, G., Hockenbery, Z., Holt, J. D., Hornung, C., Izzo, C., Jacobs, A., Javaji, A., Kootte, B., Kripkó-Koncz, G., Lykiardopoulou, E. M., Miyagi, T., Mukul, I., Murböck, T., Plaß, W. R., Reiter, M. P., Ringuette, J., Scheidenberger, C., Silwal, R., Walls, C., Wang, H. L., Wang, Y., Yang, J., Dilling, J., and Kwiatkowski, A. A.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Nuclear properties across the chart of nuclides are key to improving and validating our understanding of the strong interaction in nuclear physics. We present high-precision mass measurements of neutron-rich Fe isotopes performed at the TITAN facility. The multiple-reflection time-of-flight mass spectrometer (MR-ToF-MS), achieving a resolving power greater than $600\,000$ for the first time, enabled the measurement of $^{63-70}$Fe, including first-time high-precision direct measurements ($\delta m/m \sim 10^{-7}$) of $^{68-70}$Fe, as well as the discovery of a long-lived isomeric state in $^{69}$Fe. These measurements are accompanied by both mean-field and ab initio calculations using the most recent realizations which enable theoretical assignment of the spin-parities of the $^{69}$Fe ground and isomeric states. Together with mean-field calculations of quadrupole deformation parameters for the Fe isotope chain, these results benchmark a maximum of deformation in the $N = 40$ island of inversion in Fe, and shed light on trends in level densities indicated in the newly-refined mass surface., Comment: 9 pages, 6 figures

Published
2022
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5. Mass measurements of $^{60-63}$Ga reduce x-ray burst model uncertainties and extend the evaluated $T=1$ isobaric multiplet mass equation

Author

Paul, S. F., Bergmann, J., Cardona, J. D., Dietrich, K. A., Dunling, E., Hockenbery, Z., Hornung, C., Izzo, C., Jacobs, A., Javaji, A., Kootte, B., Lan, Y., Leistenschneider, E., Lykiardopoulou, E. M., Mukul, I., Murböck, T., Porter, W. S., Silwal, R., Smith, M. B., Ringuette, J., Brunner, T., Dickel, T., Dillmann, I., Gwinner, G., MacCormick, M., Reiter, M. P., Schatz, H., Smirnova, N. A., Dilling, J., and Kwiatkowski, A. A.

Subjects
Nuclear Experiment, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report precision mass measurements of neutron-deficient gallium isotopes approaching the proton drip line. The measurements of $^{60-63}$Ga performed with the TITAN multiple-reflection time-of-flight mass spectrometer provide a more than threefold improvement over the current literature mass uncertainty of $^{61}$Ga and mark the first direct mass measurement of $^{60}$Ga. The improved precision of the $^{61}$Ga mass has important implications for the astrophysical rp process, as it constrains essential reaction Q-values near the $^{60}$Zn waiting point. Based on calculations with a one-zone model, we demonstrate the impact of the improved mass data on prediction uncertainties of X-ray burst models. The first-time measurement of the $^{60}$Ga ground-state mass establishes the proton-bound nature of this nuclide; thus, constraining the location of the proton drip line along this isotopic chain. Including the measured mass of $^{60}$Ga further enables us to extend the evaluated $T=1$ isobaric multiplet mass equation up to $A=60$., Comment: 16 pages, 6 figures

Published
2021
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6. Precision mass measurements of neutron-rich scandium isotopes refine the evolution of $N=32$ and $N=34$ shell closures

Author

Leistenschneider, E., Dunling, E., Bollen, G., Brown, B. A., Dilling, J., Hamaker, A., Holt, J. D., Jacobs, A., Kwiatkowski, A. A., Miyagi, T., Porter, W. S., Puentes, D., Redshaw, M., Reiter, M. P., Ringle, R., Sandler, R., Sumithrarachchi, C. S., Valverde, A. A., Yandow, I. T., and Collaboration, the TITAN

Subjects
Nuclear Experiment
Abstract

We report high-precision mass measurements of $^{50-55}$Sc isotopes performed at the LEBIT facility at NSCL and at the TITAN facility at TRIUMF. Our results provide a substantial reduction of their uncertainties and indicate significant deviations, up to 0.7 MeV, from the previously recommended mass values for $^{53-55}$Sc. The results of this work provide an important update to the description of emerging closed-shell phenomena at neutron numbers $N=32$ and $N=34$ above proton-magic $Z=20$. In particular, they finally enable a complete and precise characterization of the trends in ground state binding energies along the $N=32$ isotone, confirming that the empirical neutron shell gap energies peak at the doubly-magic $^{52}$Ca. Moreover, our data, combined with other recent measurements, does not support the existence of closed neutron shell in $^{55}$Sc at $N=34$. The results were compared to predictions from both \emph{ab initio} and phenomenological nuclear theories, which all had success describing $N=32$ neutron shell gap energies but were highly disparate in the description of the $N=34$ isotone.

Published
2020
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7. Direct observation of proton emission in 11Be

Author

Ayyad, Y., Olaizola, B., Mittig, W., Potel, G., Zelevinsky, V., Horoi, M., Beceiro-Novo, S., Alcorta, M., Andreoiu, C., Ahn, T., Anholm, M., Atar, L., Babu, A., Bazin, D., Bernier, N., Bhattacharjee, S. S., Bowry, M., Caballero-Folch, R., Cortesi, M., Dalitz, C., Dunling, E., Garnsworthy, A. B., Holl, M., Kootte, B., Leach, K. G., Randhawa, J. S., Saito, Y., Santamaria, C., Šiuryte, P., Svensson, C. E., Umashankar, R., Watwood, N., and Yates, D.

Subjects
Nuclear Experiment
Abstract

The elusive $\beta^-\text{p}^+$ decay was observed in $^{11}$Be by directly measuring the emitted protons and their energy distribution for the first time with the prototype Active Target Time Projection Chamber (pAT-TPC) in an experiment performed at ISAC-TRIUMF. The measured $\beta^-\text{p}^+$ branching ratio is orders of magnitude larger than any previous theoretical model predicted. This can be explained by the presence of a narrow resonance in $^{11}$B above the proton separation energy.

Published
2019
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8. Improved high-precision mass measurements of mid-shell neon isotopes

Author

Jacobs, A., Andreoiu, C., Bergmann, J., Brunner, T., Dickel, T., Dillmann, I., Dunling, E., Flowerdew, J., Graham, L., Gwinner, G., Hockenbery, Z., Huang, W.J., Kootte, B., Lan, Y., Leach, K.G., Leistenschneider, E., Lunney, D., Lykiardopoulou, E.M., Monier, V., Mukul, I., Paul, S.F., Plaß, W.R., Reiter, M.P., Scheidenberger, C., Thompson, R., Tracy, J.L., Will, C., Wieser, M.E., Dilling, J., and Kwiatkowski, A.A.

Published
2023
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9. Mass Measurements of Neutron-Rich Gallium Isotopes Refine Production of Nuclei of the First r-Process Abundance Peak in Neutron Star Merger Calculations

Author

Reiter, M. P., Andrés, S. Ayet San, Nikas, S., Lippuner, J., Andreoiu, C., Babcock, C., Barquest, B. R., Bollig, J., Brunner, T., Dickel, T., Dilling, J., Dillmann, I., Dunling, E., Gwinner, G., Graham, L., Hornung, C., Klawitter, R., Kootte, B., Kwiatkowski, A. A., Lan, Y., Lascar, D., Leach, K. G., Leistenschneider, E., Martínez-Pinedo, G., McKay, J. E., Paul, S. F., Plaß, W. R., Roberts, L., Schatz, H., Scheidenberger, C., Sieverding, A., Steinbrügge, R., Thompson, R., Wieser, M. E., Will, C., and Welch, D.

Subjects
Nuclear Experiment, Astrophysics - High Energy Astrophysical Phenomena, Nuclear Theory
Abstract

We report mass measurements of neutron-rich Ga isotopes $^{80-85}$Ga with TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN). The measurements determine the masses of $^{80-83}$Ga in good agreement with previous measurements. The masses of $^{84}$Ga and $^{85}$Ga were measured for the first time. Uncertainties between $25-48$ keV were reached. The new mass values reduce the nuclear uncertainties associated with the production of A $\approx$ 84 isotopes by the \emph{r}-process for astrophysical conditions that might be consistent with a binary neutron star (BNS) merger producing a blue kilonova. Our nucleosynthesis simulations confirm that BNS merger may contribute to the first abundance peak under moderate neutron-rich conditions with electron fractions $Y_e=0.35-0.38$.

Published
2018
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10. Dawning of the N=32 shell closure seen through precision mass measurements of neutron-rich titanium isotopes

Author

Leistenschneider, E., Reiter, M. P., Andrés, S. Ayet San, Kootte, B., Holt, J. D., Navrátil, P., Babcock, C., Barbieri, C., Barquest, B. R., Bergmann, J., Bollig, J., Brunner, T., Dunling, E., Finlay, A., Geissel, H., Graham, L., Greiner, F., Hergert, H., Hornung, C., Jesch, C., Klawitter, R., Lan, Y., Lascar, D., Leach, K. G., Lippert, W., McKay, J. E., Paul, S. F., Schwenk, A., Short, D., Simonis, J., Somà, V., Steinbrügge, R., Stroberg, S. R., Thompson, R., Wieser, M. E., Will, C., Yavor, M., Andreoiu, C., Dickel, T., Dillmann, I., Gwinner, G., Plaß, W. R., Scheidenberger, C., Kwiatkowski, A. A., and Dilling, J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

A precision mass investigation of the neutron-rich titanium isotopes $^{51-55}$Ti was performed at TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN). The range of the measurements covers the $N=32$ shell closure and the overall uncertainties of the $^{52-55}$Ti mass values were significantly reduced. Our results confirm the existence of a weak shell effect at $N=32$, establishing the abrupt onset of this shell closure. Our data were compared with state-of-the-art \textit{ab-initio} shell model calculations which, despite very successfully describing where the $N=32$ shell gap is strong, overpredict its strength and extent in titanium and heavier isotones. These measurements also represent the first scientific results of TITAN using the newly commissioned Multiple-Reflection Time-of-Flight Mass Spectrometer (MR-TOF-MS), substantiated by independent measurements from TITAN's Penning trap mass spectrometer.

Published
2017
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12. Improved beam diagnostics and optimization at ISAC via TITAN’s MR-TOF-MS

Author

Reiter, M.P., Ames, F., Andreoiu, C., Ayet San Andrés, S., Babcock, C., Barquest, B.R., Bergmann, J., Bollig, J., Brunner, T., Dickel, T., Dilling, J., Dillmann, I., Dunling, E., Finlay, A., Gwinner, G., Graham, L., Hornung, C., Kootte, B., Klawitter, R., Kunz, P., Lan, Y., Lascar, D., Lassen, J., Leistenschneider, E., Li, R., McKay, J.E., Mostamand, M., Paul, S.F., Plaß, W.R., Scheidenberger, C., Schultz, B.E., Steinbrügge, R., Teigelhoefer, A., Thompson, R., Wieser, M.E., Will, C., and Kwiatkowski, A.A.

Published
2020
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13. Collision-Induced Dissociation at TRIUMF's Ion Trap for Atomic and Nuclear science

Author

Jacobs, A., primary, Andreoiu, C., additional, Bergmann, J., additional, Brunner, T., additional, Dickel, T., additional, Dillmann, I., additional, Dunling, E., additional, Flowerdew, J., additional, Graham, L., additional, Gwinner, G., additional, Hockenbery, Z., additional, Kootte, B., additional, Lan, Y., additional, Leach, K.G., additional, Leistenschneider, E., additional, Lykiardopoulou, E.M., additional, Monier, V., additional, Mukul, I., additional, Paul, S.F., additional, Plaß, W.R., additional, Reiter, M.P., additional, Scheidenberger, C., additional, Thompson, R., additional, Tracy, J.L., additional, Will, C., additional, Wieser, M.E., additional, Yavor, M., additional, Dilling, J., additional, and Kwiatkowski, A.A., additional

Published
2022
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14. Summit of the N=40 island of inversion: Precision mass measurements and ab initio calculations of neutron-rich chromium isotopes

Author

Silwal, R., primary, Andreoiu, C., additional, Ashrafkhani, B., additional, Bergmann, J., additional, Brunner, T., additional, Cardona, J., additional, Dietrich, K., additional, Dunling, E., additional, Gwinner, G., additional, Hockenbery, Z., additional, Holt, J.D., additional, Izzo, C., additional, Jacobs, A., additional, Javaji, A., additional, Kootte, B., additional, Lan, Y., additional, Lunney, D., additional, Lykiardopoulou, E.M., additional, Miyagi, T., additional, Mougeot, M., additional, Mukul, I., additional, Murböck, T., additional, Porter, W.S., additional, Reiter, M., additional, Ringuette, J., additional, Dilling, J., additional, and Kwiatkowski, A.A., additional

Published
2022
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15. Investigating nuclear structure near N=32 and N=34: Precision mass measurements of neutron-rich Ca, Ti, and V isotopes

Author

Porter, W. S., primary, Dunling, E., additional, Leistenschneider, E., additional, Bergmann, J., additional, Bollen, G., additional, Dickel, T., additional, Dietrich, K. A., additional, Hamaker, A., additional, Hockenbery, Z., additional, Izzo, C., additional, Jacobs, A., additional, Javaji, A., additional, Kootte, B., additional, Lan, Y., additional, Miskun, I., additional, Mukul, I., additional, Murböck, T., additional, Paul, S. F., additional, Plaß, W. R., additional, Puentes, D., additional, Redshaw, M., additional, Reiter, M. P., additional, Ringle, R., additional, Ringuette, J., additional, Sandler, R., additional, Scheidenberger, C., additional, Silwal, R., additional, Simpson, R., additional, Sumithrarachchi, C. S., additional, Teigelhöfer, A., additional, Valverde, A. A., additional, Weil, R., additional, Yandow, I. T., additional, Dilling, J., additional, and Kwiatkowski, A. A., additional

Published
2022
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16. Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes

Author

Porter, W. S., primary, Ashrafkhani, B., additional, Bergmann, J., additional, Brown, C., additional, Brunner, T., additional, Cardona, J. D., additional, Curien, D., additional, Dedes, I., additional, Dickel, T., additional, Dudek, J., additional, Dunling, E., additional, Gwinner, G., additional, Hockenbery, Z., additional, Holt, J. D., additional, Hornung, C., additional, Izzo, C., additional, Jacobs, A., additional, Javaji, A., additional, Kootte, B., additional, Kripkó-Koncz, G., additional, Lykiardopoulou, E. M., additional, Miyagi, T., additional, Mukul, I., additional, Murböck, T., additional, Plaß, W. R., additional, Reiter, M. P., additional, Ringuette, J., additional, Scheidenberger, C., additional, Silwal, R., additional, Walls, C., additional, Wang, H. L., additional, Wang, Y., additional, Yang, J., additional, Dilling, J., additional, and Kwiatkowski, A. A., additional

Published
2022
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17. Mass measurements of 60–63Ga reduce x-ray burst model uncertainties and extend the evaluated T=1 isobaric multiplet mass equation

Author

Paul, S. F., Bergmann, J., Cardona, J. D., Dietrich, K. A., Dunling, E., Hockenbery, Z., Hornung, C., Izzo, C., Jacobs, A., Javaji, A., Kootte, B., Lan, Y., Leistenschneider, E., Lykiardopoulou, E. M., Mukul, I., Murb��ck, T., Porter, W. S., Silwal, R., Smith, M. B., Ringuette, J., Brunner, T., Dickel, T., Dillmann, I., Gwinner, G., MacCormick, M., Reiter, M. P., Schatz, H., Smirnova, N. A., Dilling, J., Kwiatkowski, A. 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), astro-ph.HE, Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - High Energy Astrophysical Phenomena, Nuclear Experiment, nucl-ex
Abstract

We report precision mass measurements of neutron-deficient gallium isotopes approaching the proton drip line. The measurements of $^{60-63}$Ga performed with the TITAN multiple-reflection time-of-flight mass spectrometer provide a more than threefold improvement over the current literature mass uncertainty of $^{61}$Ga and mark the first direct mass measurement of $^{60}$Ga. The improved precision of the $^{61}$Ga mass has important implications for the astrophysical rp process, as it constrains essential reaction Q-values near the $^{60}$Zn waiting point. Based on calculations with a one-zone model, we demonstrate the impact of the improved mass data on prediction uncertainties of X-ray burst models. The first-time measurement of the $^{60}$Ga ground-state mass establishes the proton-bound nature of this nuclide; thus, constraining the location of the proton drip line along this isotopic chain. Including the measured mass of $^{60}$Ga further enables us to extend the evaluated $T=1$ isobaric multiplet mass equation up to $A=60$., 16 pages, 6 figures

Published
2021

18. Coulomb excitation of Kr-80,Kr-82 and a change in structure approaching N = Z=40

Author

Gillespie, SA, Henderson, J, Abrahams, K, Ali, FA, Atar, L, Ball, GC, Bernier, N, Bhattcharjee, SS, Caballero-Folch, R, Bowry, M, Chester, A, Coleman, R, Drake, T, Dunling, E, Garnsworthy, AB, Greaves, B, Grinyer, GF, Hackman, G, Kasanda, E, LaFleur, R, Masango, S, Muecher, D, Ngwetsheni, C, Ntshangase, SS, Olaizola, B, Orce, JN, Rockman, T, Saito, Y, Sexton, L, Siuryte, P, Smallcombe, J, Smith, JK, Svensson, CE, Timakova, E, Wadsworth, R, Williams, J, Winokan, MSC, Wu, CY, and Zidar, T

Published
2021

19. Coulomb excitation of and a change in structure approaching N = Z = 40

Author

Gillespie, S. A., Henderson, J., Abrahams, K., Ali, F. A., Atar, L., Ball, G. C., Bernier, N., Bhattcharjee, S. S., Caballero-Folch, R., Bowry, M., Chester, A., Coleman, R., Drake, T., Dunling, E., Garnsworthy, A. B., Greaves, B., Grinyer, G. F., Hackman, G., Kasanda, E., LaFleur, R., Masango, S., Muecher, D., Ngwetsheni, C., Ntshangase, S. S., Olaizola, B., Orce, J. N., Rockman, T., Saito, Y., Sexton, L., Šiurytė, P., Smallcombe, J., Smith, J. K., Svensson, C. E., Timakova, E., Wadsworth, R., Williams, J., Winokan, M. S.C., Wu, C. Y., and Zidar, T.

Subjects
Physics::Atomic Physics, Nuclear Experiment
Abstract

Background: Nuclei approaching are known to exhibit strongly deformed structures and are thought to be candidates for shape coexistence. In the krypton isotopes, are poorly characterized, preventing an understanding of evolving deformation approaching . Purpose: The present work aims to determine electric quadrupole transition strengths and quadrupole moments of in order to better characterize their deformation. Conclusions: Comparison of measured and values indicates that neutron-deficient () isotopes of krypton are closer to axial deformation than other isotopic chains in the mass region. A continuation of this trend to higher may result in Sr and Zr isotopes exhibiting near-axial prolate deformation. Methods: Sub-barrier Coulomb excitation was employed, impinging the isotopes of krypton on and targets. Utilizing a semiclassical description of the safe Coulomb-excitation process matrix elements could then be determined. Results: Eleven new or improved matrix elements are determined in and seven in . The new value in disagrees with the evaluated value by , which can be explained in terms of deficiencies in a previous Coulomb-excitation analysis.

Published
2021

20. Mass measurements of Ga60–63 reduce x-ray burst model uncertainties and extend the evaluated T=1 isobaric multiplet mass equation

Author

Paul, S. F., primary, Bergmann, J., additional, Cardona, J. D., additional, Dietrich, K. A., additional, Dunling, E., additional, Hockenbery, Z., additional, Hornung, C., additional, Izzo, C., additional, Jacobs, A., additional, Javaji, A., additional, Kootte, B., additional, Lan, Y., additional, Leistenschneider, E., additional, Lykiardopoulou, E. M., additional, Mukul, I., additional, Murböck, T., additional, Porter, W. S., additional, Silwal, R., additional, Smith, M. B., additional, Ringuette, J., additional, Brunner, T., additional, Dickel, T., additional, Dillmann, I., additional, Gwinner, G., additional, MacCormick, M., additional, Reiter, M. P., additional, Schatz, H., additional, Smirnova, N. A., additional, Dilling, J., additional, and Kwiatkowski, A. A., additional

Published
2021
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21. Coulomb excitation of Kr80,82 and a change in structure approaching N=Z=40

Author

Gillespie, S. A., primary, Henderson, J., additional, Abrahams, K., additional, Ali, F. A., additional, Atar, L., additional, Ball, G. C., additional, Bernier, N., additional, Bhattcharjee, S. S., additional, Caballero-Folch, R., additional, Bowry, M., additional, Chester, A., additional, Coleman, R., additional, Drake, T., additional, Dunling, E., additional, Garnsworthy, A. B., additional, Greaves, B., additional, Grinyer, G. F., additional, Hackman, G., additional, Kasanda, E., additional, LaFleur, R., additional, Masango, S., additional, Muecher, D., additional, Ngwetsheni, C., additional, Ntshangase, S. S., additional, Olaizola, B., additional, Orce, J. N., additional, Rockman, T., additional, Saito, Y., additional, Sexton, L., additional, Šiurytė, P., additional, Smallcombe, J., additional, Smith, J. K., additional, Svensson, C. E., additional, Timakova, E., additional, Wadsworth, R., additional, Williams, J., additional, Winokan, M. S. C., additional, Wu, C. Y., additional, and Zidar, T., additional

Published
2021
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22. Examining the nuclear mass surface of Rb and Sr isotopes in the A≈104 region via precision mass measurements

Author

Mukul, I., primary, Andreoiu, C., additional, Bergmann, J., additional, Brodeur, M., additional, Brunner, T., additional, Dietrich, K. A., additional, Dickel, T., additional, Dillmann, I., additional, Dunling, E., additional, Fusco, D., additional, Gwinner, G., additional, Izzo, C., additional, Jacobs, A., additional, Kootte, B., additional, Lan, Y., additional, Leistenschneider, E., additional, Lykiardopoulou, E. M., additional, Paul, S. F., additional, Reiter, M. P., additional, Tracy, J. L., additional, Dilling, J., additional, and Kwiatkowski, A. A., additional

Published
2021
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23. Mass measurements of neutron-rich indium isotopes for r -process studies

Author

Izzo, C., primary, Bergmann, J., additional, Dietrich, K. A., additional, Dunling, E., additional, Fusco, D., additional, Jacobs, A., additional, Kootte, B., additional, Kripkó-Koncz, G., additional, Lan, Y., additional, Leistenschneider, E., additional, Lykiardopoulou, E. M., additional, Mukul, I., additional, Paul, S. F., additional, Reiter, M. P., additional, Tracy, J. L., additional, Andreoiu, C., additional, Brunner, T., additional, Dickel, T., additional, Dilling, J., additional, Dillmann, I., additional, Gwinner, G., additional, Lascar, D., additional, Leach, K. G., additional, Plaß, W. R., additional, Scheidenberger, C., additional, Wieser, M. E., additional, and Kwiatkowski, A. A., additional

Published
2021
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24. Measuring the half-life of n-rich 100Rb with the TITAN MR-TOF-MS

Author

Mukul, I., primary, Andreoiu, C., additional, Brodeur, M., additional, Brunner, T., additional, Dietrich, K., additional, Dickel, T., additional, Dillmann, I., additional, Dunling, E., additional, Fusco, D., additional, Gwinner, G., additional, Izzo, C., additional, Jacobs, A., additional, Kootte, B., additional, Lan, Y., additional, Leistenschneider, E., additional, Lykiardopoulou, M., additional, Paul, S. F., additional, Reiter, M. P., additional, Tracy, J. L., additional, Dilling, J., additional, and Kwiatkowski, A. A., additional

Published
2020
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25. Erratum: Direct Observation of Proton Emission in Be11 [Phys. Rev. Lett. 123 , 082501 (2019)]

Author

Ayyad, Y., primary, Olaizola, B., additional, Mittig, W., additional, Potel, G., additional, Zelevinsky, V., additional, Horoi, M., additional, Beceiro-Novo, S., additional, Alcorta, M., additional, Andreoiu, C., additional, Ahn, T., additional, Anholm, M., additional, Atar, L., additional, Babu, A., additional, Bazin, D., additional, Bernier, N., additional, Bhattacharjee, S. S., additional, Bowry, M., additional, Caballero-Folch, R., additional, Cortesi, M., additional, Dalitz, C., additional, Dunling, E., additional, Garnsworthy, A. B., additional, Holl, M., additional, Kootte, B., additional, Leach, K. G., additional, Randhawa, J. S., additional, Saito, Y., additional, Santamaria, C., additional, Šiurytė, P., additional, Svensson, C. E., additional, Umashankar, R., additional, Watwood, N., additional, and Yates, D., additional

Published
2020
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26. Mass measurements of neutron-rich gallium isotopes refine production of nuclei of the first r -process abundance peak in neutron-star merger calculations

Author

Reiter, M. P., primary, Ayet San Andrés, S., additional, Nikas, S., additional, Lippuner, J., additional, Andreoiu, C., additional, Babcock, C., additional, Barquest, B. R., additional, Bollig, J., additional, Brunner, T., additional, Dickel, T., additional, Dilling, J., additional, Dillmann, I., additional, Dunling, E., additional, Gwinner, G., additional, Graham, L., additional, Hornung, C., additional, Klawitter, R., additional, Kootte, B., additional, Kwiatkowski, A. A., additional, Lan, Y., additional, Lascar, D., additional, Leach, K. G., additional, Leistenschneider, E., additional, Martínez-Pinedo, G., additional, McKay, J. E., additional, Paul, S. F., additional, Plaß, W. R., additional, Roberts, L., additional, Schatz, H., additional, Scheidenberger, C., additional, Sieverding, A., additional, Steinbrügge, R., additional, Thompson, R., additional, Wieser, M. E., additional, Will, C., additional, and Welch, D., additional

Published
2020
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27. Direct Observation of Proton Emission in Be11

Author

Ayyad, Y., primary, Olaizola, B., additional, Mittig, W., additional, Potel, G., additional, Zelevinsky, V., additional, Horoi, M., additional, Beceiro-Novo, S., additional, Alcorta, M., additional, Andreoiu, C., additional, Ahn, T., additional, Anholm, M., additional, Atar, L., additional, Babu, A., additional, Bazin, D., additional, Bernier, N., additional, Bhattacharjee, S. S., additional, Bowry, M., additional, Caballero-Folch, R., additional, Cortesi, M., additional, Dalitz, C., additional, Dunling, E., additional, Garnsworthy, A. B., additional, Holl, M., additional, Kootte, B., additional, Leach, K. G., additional, Randhawa, J. S., additional, Saito, Y., additional, Santamaria, C., additional, Šiurytė, P., additional, Svensson, C. E., additional, Umashankar, R., additional, Watwood, N., additional, and Yates, D., additional

Published
2019
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28. Quenching of the N=32 neutron shell closure studied via precision mass measurements of neutron-rich vanadium isotopes

Author

Reiter, M. P., primary, Ayet San Andrés, S., additional, Dunling, E., additional, Kootte, B., additional, Leistenschneider, E., additional, Andreoiu, C., additional, Babcock, C., additional, Barquest, B. R., additional, Bollig, J., additional, Brunner, T., additional, Dillmann, I., additional, Finlay, A., additional, Gwinner, G., additional, Graham, L., additional, Holt, J. D., additional, Hornung, C., additional, Jesch, C., additional, Klawitter, R., additional, Lan, Y., additional, Lascar, D., additional, McKay, J. E., additional, Paul, S. F., additional, Steinbrügge, R., additional, Thompson, R., additional, Tracy, J. L., additional, Wieser, M. E., additional, Will, C., additional, Dickel, T., additional, Plaß, W. R., additional, Scheidenberger, C., additional, Kwiatkowski, A. A., additional, and Dilling, J., additional

Published
2018
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29. Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes

Author

Leistenschneider, E., primary, Reiter, M. P., additional, Ayet San Andrés, S., additional, Kootte, B., additional, Holt, J. D., additional, Navrátil, P., additional, Babcock, C., additional, Barbieri, C., additional, Barquest, B. R., additional, Bergmann, J., additional, Bollig, J., additional, Brunner, T., additional, Dunling, E., additional, Finlay, A., additional, Geissel, H., additional, Graham, L., additional, Greiner, F., additional, Hergert, H., additional, Hornung, C., additional, Jesch, C., additional, Klawitter, R., additional, Lan, Y., additional, Lascar, D., additional, Leach, K. G., additional, Lippert, W., additional, McKay, J. E., additional, Paul, S. F., additional, Schwenk, A., additional, Short, D., additional, Simonis, J., additional, Somà, V., additional, Steinbrügge, R., additional, Stroberg, S. R., additional, Thompson, R., additional, Wieser, M. E., additional, Will, C., additional, Yavor, M., additional, Andreoiu, C., additional, Dickel, T., additional, Dillmann, I., additional, Gwinner, G., additional, Plaß, W. R., additional, Scheidenberger, C., additional, Kwiatkowski, A. A., additional, and Dilling, J., additional

Published
2018
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30. Precision Mass Measurements of Neutron-Rich Scandium Isotopes Refine the Evolution of N=32 and N=34 Shell Closures.

Author

Leistenschneider, E., Dunling, E., Bollen, G., Brown, B. A., Dilling, J., Hamaker, A., Holt, J. D., Jacobs, A., Kwiatkowski, A. A., Miyagi, T., Porter, W. S., Puentes, D., Redshaw, M., Reiter, M. P., Ringle, R., Sandler, R., Sumithrarachchi, C. S., Valverde, A. A., and Yandow, I. T.

Subjects
*MASS measurement, *GROUND state energy, *ISOTOPES, *BAND gaps, *SCANDIUM, *NEUTRONS
Abstract

We report high-precision mass measurements of 50-55Sc isotopes performed at the LEBIT facility at NSCL and at the TITAN facility at TRIUMF. Our results provide a substantial reduction of their uncertainties and indicate significant deviations, up to 0.7 MeV, from the previously recommended mass values for 53-55Sc. The results of this work provide an important update to the description of emerging closed-shell phenomena at neutron numbers N=32 and N=34 above proton-magic Z=20. In particular, they finally enable a complete and precise characterization of the trends in ground state binding energies along the N=32 isotone, confirming that the empirical neutron shell gap energies peak at the doubly magic 52Ca. Moreover, our data, combined with other recent measurements, do not support the existence of a closed neutron shell in 55Sc at N=34. The results were compared to predictions from both ab initio and phenomenological nuclear theories, which all had success describing N=32 neutron shell gap energies but were highly disparate in the description of the N=34 isotone. [ABSTRACT FROM AUTHOR]

Published
2021
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31. Mass Measurements of Neutron-Deficient Yb Isotopes and Nuclear Structure at the Extreme Proton-Rich Side of the N=82 Shell.

Author

Beck S, Kootte B, Dedes I, Dickel T, Kwiatkowski AA, Lykiardopoulou EM, Plaß WR, Reiter MP, Andreoiu C, Bergmann J, Brunner T, Curien D, Dilling J, Dudek J, Dunling E, Flowerdew J, Gaamouci A, Graham L, Gwinner G, Jacobs A, Klawitter R, Lan Y, Leistenschneider E, Minkov N, Monier V, Mukul I, Paul SF, Scheidenberger C, Thompson RI, Tracy JL, Vansteenkiste M, Wang HL, Wieser ME, Will C, and Yang J

Abstract

High-accuracy mass measurements of neutron-deficient Yb isotopes have been performed at TRIUMF using TITAN's multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). For the first time, an MR-TOF-MS was used on line simultaneously as an isobar separator and as a mass spectrometer, extending the measurements to two isotopes further away from stability than otherwise possible. The ground state masses of ^{150,153}Yb and the excitation energy of ^{151}Yb^{m} were measured for the first time. As a result, the persistence of the N=82 shell with almost unmodified shell gap energies is established up to the proton drip line. Furthermore, the puzzling systematics of the h_{11/2}-excited isomeric states of the N=81 isotones are unraveled using state-of-the-art mean field calculations.

Published
2021
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32. Erratum: Direct Observation of Proton Emission in ^{11}Be [Phys. Rev. Lett. 123, 082501 (2019)].

Author

Ayyad Y, Olaizola B, Mittig W, Potel G, Zelevinsky V, Horoi M, Beceiro-Novo S, Alcorta M, Andreoiu C, Ahn T, Anholm M, Atar L, Babu A, Bazin D, Bernier N, Bhattacharjee SS, Bowry M, Caballero-Folch R, Cortesi M, Dalitz C, Dunling E, Garnsworthy AB, Holl M, Kootte B, Leach KG, Randhawa JS, Saito Y, Santamaria C, Šiurytė P, Svensson CE, Umashankar R, Watwood N, and Yates D

Abstract

This corrects the article DOI: 10.1103/PhysRevLett.123.082501.

Published
2020
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