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39 results on '"Mukul, I."'

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. 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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7. Interplay between nuclear shell evolution and shape deformation revealed by magnetic moment of 75Cu

Author

Ichikawa, Y., Nishibata, H., Tsunoda, Y., Takamine, A., Imamura, K., Fujita, T., Sato, T., Momiyama, S., Shimizu, Y., Ahn, D. S., Asahi, K., Baba, H., Balabanski, D. L., Boulay, F., Daugas, J. M., Egami, T., Fukuda, N., Funayama, C., Furukawa, T., Georgiev, G., Inabe, N., Ishibashi, Y., Kawaguchi, T., Kawamura, T., Kobayashi, Y., Kojima, S., Kusoglu, A., Mukul, I., Niikura, M., NIshizaka, T., Odahara, A., Ohtomo, Y., Otsuka, T., ralet, D., Simpson, G. S., Sumikama, T., Suzuki, H., Takeda, H., Tao, L. C., Togano, Y., Tominaga, D., Ueno, H., Yamazaki, H., and Yang, X. F.

Subjects
Nuclear Experiment
Abstract

Exotic nuclei are characterized by a number of neutrons (or protons) in excess relative to stable nuclei. Their shell structure, which represents single-particle motion in a nucleus, may vary due to nuclear force and excess neutrons, in a phenomenon called shell evolution. This effect could be counterbalanced by collective modes causing deformations of the nuclear surface. Here, we study the interplay between shell evolution and shape deformation by focusing on the magnetic moment of an isomeric state of the neutron-rich nucleus 75Cu. We measure the magnetic moment using highly spin-controlled rare-isotope beams and achieving large spin alignment via a two-step reaction scheme that incorporates an angular-momentum-selecting nucleon removal. By combining our experiments with numerical simulations of many-fermion correlations, we find that the low-lying states in 75Cu are, to a large extent, of single-particle nature on top of a correlated 74Ni core. We elucidate the crucial role of shell evolution even in the presence of the collective mode, and within the same framework, we consider whether and how the double magicity of the 78Ni nucleus is restored, which is also of keen interest from the perspective of nucleosynthesis in explosive stellar processes., Comment: 10 pages, 4 figures

Published
2018
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8. A new scheme to measure the electron-neutrino correlation - the case of $^{6}$He

Author

Mukul, I., Hass, M., Heber, O., Hirsh, T. Y., Mishnayot, Y., Rappaport, M. L., Ron, G., Shachar, Y., and Vaintraub, S.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

A novel experiment has been commissioned at the Weizmann Institute of Science for the study of weak interactions via a high-precision measurement of the beta-neutrino angular correlation in the radioactive decay of short-lived $^{6}$He. The facility consists of a 14 MeV $d+t$ neutron generator to produce atomic $^{6}$He, followed by ionization and bunching in an electron beam ion source, and injection into an electrostatic ion beam trap. This ion trap has been designed for efficient detection of the decay products from trapped light ions. The storage time in the trap for different stable ions was found to be in the range of 0.6 to 1.2 s at the chamber pressure of $\sim$7$\times$10$^{-10}$ mbar. We present the initial test results of the facility, and also demonstrate an important upgrade of an existing method \cite{stora} for production of light radioactive atoms, viz. $^{6}$He, for the precision measurement. The production rate of $^{6}$He atoms in the present setup has been estimated to be $\sim 1.45\times10^{-4}$ atoms per neutron, and the system efficiency was found to be 4.0$\pm$0.6\%. An improvement to this setup is also presented for the enhanced production and diffusion of radioactive atoms for future use., Comment: 8 pages, 8 figures

Published
2017

10. Interplay between nuclear shell evolution and shape deformation revealed by the magnetic moment of 75Cu

Author

Ichikawa, Y., Nishibata, H., Tsunoda, Y., Takamine, A., Imamura, K., Fujita, T., Sato, T., Momiyama, S., Shimizu, Y., Ahn, D. S., Asahi, K., Baba, H., Balabanski, D. L., Boulay, F., Daugas, J. M., Egami, T., Fukuda, N., Funayama, C., Furukawa, T., Georgiev, G., Gladkov, A., Inabe, N., Ishibashi, Y., Kawaguchi, T., Kawamura, T., Kobayashi, Y., Kojima, S., Kusoglu, A., Mukul, I., Niikura, M., Nishizaka, T., Odahara, A., Ohtomo, Y., Otsuka, T., Ralet, D., Simpson, G. S., Sumikama, T., Suzuki, H., Takeda, H., Tao, L. C., Togano, Y., Tominaga, D., Ueno, H., Yamazaki, H., and Yang, X. F.

Published
2019
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11. 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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12. 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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13. 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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14. 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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16. 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

17. Boulay et al. Reply: Comment on 'g Factor of the Zr99(7/2+) Isomer: Monopole Evolution in the Shape-Coexisting Region'

Author

Boulay, F., Simpson, G.S., Ichikawa, Y., Kisyov, S., Bucurescu, D., Takamine, A., Ahn, D.S., Asahi, K., Baba, H., Balabanski, D.L., Egami, T., Fujita, T., Fukuda, N., Funayama, C., Furukawa, T., Georgiev, G., Gladkov, A., Hass, M., Imamura, K., Inabe, N., Ishibashi, Y., Kawaguchi, T., Kawamura, T., Kim, W., Kobayashi, Y., Kojima, S., Kusoglu, A., Lozeva, R., Momiyama, S., Mukul, I., Niikura, M., Nishibata, H., Nishizaka, T., Odahara, A., Ohtomo, Y., Ralet, D., Sato, T., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Tao, L.C., Togano, Y., Tominaga, D., Ueno, H., Yamazaki, H., Yang, X.F., Daugas, J.M., Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), 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), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
21.60.-n, 25.70.Mn, 23.20.En, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], numbers: 21.10.Ky, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2021

18. 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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19. 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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20. 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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21. g Factor of the Zr-99 (7/2(+)) Isomer: Monopole Evolution in the Shape-Coexisting Region

Author

Boulay, F, Simpson, GS, Ichikawa, Y, Kisyov, S, Bucurescu, D, Takamine, A, Ahn, DS, Asahi, K, Baba, H, Balabanski, DL, Egami, T, Fujita, T, Fukuda, N, Funayama, C, Furukawa, T, Georgiev, G, Gladkov, A, Hass, M, K., Imamura, Inabe, N, Ishibashi, Y, Kawaguchi, T, Kawamura, T, Kim, W, Kobayashi, Y, Kojima, S, Kusoglu, A, Lozeva, R, Momiyama, S, Mukul, I, Niikura, M, Nishibata, H, Nishizaka, T, Odahara, A, Ohtomo, Y, Ralet, D, Sato, T, Shimizu, Y, Sumikama, T, Suzuki, H, Takeda, H, Tao, LC, Togano, Y, Tominaga, D, Ueno, H, Yamazaki, H, Yang, XF, Daugas, JM, and Parnefjord Gustafsson, Fredrik

Abstract

The gyromagnetic factor of the low-lying E=251.96(9) keV isomeric state of the nucleus ^{99}Zr was measured using the time-dependent perturbed angular distribution technique. This level is assigned a spin and parity of J^{π}=7/2^{+}, with a half-life of T_{1/2}=336(5) ns. The isomer was produced and spin aligned via the abrasion-fission of a ^{238}U primary beam at RIKEN RIBF. A magnetic moment |μ|=2.31(14)μ_{N} was deduced showing that this isomer is not single particle in nature. A comparison of the experimental values with interacting boson-fermion model IBFM-1 results shows that this state is strongly mixed with a main νd_{5/2} composition. Furthermore, it was found that monopole single-particle evolution changes significantly with the appearance of collective modes, likely due to type-II shell evolution. ispartof: Physical Review Letters vol:124 issue:11 ispartof: location:United States status: Published online

Published
2020

22. $g$ Factor of the $^{99}\mathrm{Zr}$ ($7/{2}^{+}$) Isomer: Monopole Evolution in the Shape-Coexisting Region

Author

Boulay, F., Simpson, G.S., Ichikawa, Y., Kisyov, S., Bucurescu, D., Takamine, A., Ahn, D.S., Asahi, K., Baba, H., Balabanski, D.L., Egami, T., Fujita, T., Fukuda, N., Funayama, C., Furukawa, T., Georgiev, G., Gladkov, A., Hass, M., Imamura, K., Inabe, N., Ishibashi, Y., Kawaguchi, T., Kawamura, T., Kim, W., Kobayashi, Y., Kojima, S., Kusoglu, A., Lozeva, R., Momiyama, S., Mukul, I., Niikura, M., Nishibata, H., Nishizaka, T., Odahara, A., Ohtomo, Y., Ralet, D., Sato, T., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Tao, L.C., Togano, Y., Tominaga, D., Ueno, H., Yamazaki, H., Yang, X.F., Daugas, J.M., Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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 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), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

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

International audience; The gyromagnetic factor of the low-lying E=251.96(9) keV isomeric state of the nucleus Zr99 was measured using the time-dependent perturbed angular distribution technique. This level is assigned a spin and parity of Jπ=7/2+, with a half-life of T1/2=336(5) ns. The isomer was produced and spin aligned via the abrasion-fission of a U238 primary beam at RIKEN RIBF. A magnetic moment |μ|=2.31(14)μN was deduced showing that this isomer is not single particle in nature. A comparison of the experimental values with interacting boson-fermion model IBFM-1 results shows that this state is strongly mixed with a main νd5/2 composition. Furthermore, it was found that monopole single-particle evolution changes significantly with the appearance of collective modes, likely due to type-II shell evolution.

Published
2020

23. 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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24. Tests and calibrations of nuclear track detectors (CR39) for operation in high neutron flux

Author

Kading, E. E., primary, Aviv, O., additional, Eliyahu, I., additional, Gai, M., additional, Halfon, S., additional, Hass, M., additional, Howell, C. R., additional, Kijel, D., additional, Mishnayot, Y., additional, Mukul, I., additional, Perry, A., additional, Shachar, Y., additional, Seiffert, Ch., additional, Shor, A., additional, Silverman, I., additional, Stern, S. R., additional, Stora, Th., additional, Ticehurst, D. R., additional, Weiss, A., additional, and Weissman, L., additional

Published
2020
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25. g Factor of the Zr99 ( 7/2+ ) Isomer: Monopole Evolution in the Shape-Coexisting Region

Author

Boulay, F., primary, Simpson, G. S., additional, Ichikawa, Y., additional, Kisyov, S., additional, Bucurescu, D., additional, Takamine, A., additional, Ahn, D. S., additional, Asahi, K., additional, Baba, H., additional, Balabanski, D. L., additional, Egami, T., additional, Fujita, T., additional, Fukuda, N., additional, Funayama, C., additional, Furukawa, T., additional, Georgiev, G., additional, Gladkov, A., additional, Hass, M., additional, Imamura, K., additional, Inabe, N., additional, Ishibashi, Y., additional, Kawaguchi, T., additional, Kawamura, T., additional, Kim, W., additional, Kobayashi, Y., additional, Kojima, S., additional, Kusoglu, A., additional, Lozeva, R., additional, Momiyama, S., additional, Mukul, I., additional, Niikura, M., additional, Nishibata, H., additional, Nishizaka, T., additional, Odahara, A., additional, Ohtomo, Y., additional, Ralet, D., additional, Sato, T., additional, Shimizu, Y., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Tao, L. C., additional, Togano, Y., additional, Tominaga, D., additional, Ueno, H., additional, Yamazaki, H., additional, Yang, X. F., additional, and Daugas, J. M., additional

Published
2020
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26. HYRA gas-filled separator coupled to 4π spin spectrometer at IUAC, New Delhi

Author

Mohanto G., Chavan P. B., Gothe D. A., Nath S., Gehlot J., Varughese T., Mazumdar I., Madhavan N., Naik M. B., Mukul I., and Sinha A. K.

Subjects
Physics, QC1-999
Abstract

The Hybrid Recoil mass Analyzer (HYRA) operated in gas-filled mode has recently been coupled with the TIFR 4π spin spectrometer at IUAC, New Delhi to carry out spin (or angular momentum) distribution of heavy residues from fusion-evaporation reactions and spin gated GDR measurements. The details of the combined facility, initial experiments on evaporation residue tagged γ-multiplicity and the extraction of average transmission efficiency of HYRA are elaborated.

Published
2011
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27. Spin-alignment in abrasion-fission reaction – g-factor measurement of isomeric states

Author

Daugas, J.M., Boulay, F., Simpson, G.S., Ichikawa, Y., Ahn, D.S., Balabanski, D.L., Egami, T., Fujita, T., Fukuda, N., Funayama, C., Furukawa, T., Georgiev, G., Gladkov, A., Hass, M., Imamura, K., Inabe, N., Ishibashi, Y., Kawaguchi, T., Kawamura, T., Kim, W., Kobayashi, Y., Kojima, S., Kusoglu, A., Momiyama, S., Mukul, I., Niikura, M., Nishibata, H., Nishizaka, T., Odahara, A., Ohtomo, Y., Ralet, D., Sato, T., Shimizu, Y., Shimoda, T., Sumikama, T., Suzuki, H., Takeda, H., Tao, L.C., Togano, Y., Tominaga, D., Ueno, H., Yamazaki, H., Yang, X.F., Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

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

International audience; The spin-alignment of fragments produced in spontaneous and neutroninducedfission reactions is found to be up to 40%. This amount of spin-alignmentallows the measurement of gyromagnetic factors of s isomeric states using the wellknown TDPAD method. This observable is a very sensitive probe of the singleparticlestructure of nuclear states and frequently allows one to determine thevalence nucleon configuration. Isomers produced by spontaneous fission are difficultto measure due to their low production rates and the ones produced by neutroninducedfission and selected in a spectrometer could not be measured because oneneeds to have fully stripped isotopes to preserve the spin-alignment in the vacuum.The measurement performed at the RIKEN Nishina Center accelerator usingthe abrasion-fission reaction of a 238U80+ beam at 345 MeV/u energy on the N=5999mZr and 98mY will be presented. The obtained results show the opportunity toperform gyromagnetic factors measurement of neutron-rich s-isomers produced bythe abrasion-fission reaction.

Published
2017

29. Fission time scale from pre-scission neutron and α multiplicities in the O16 + Pt194 reaction

Author

Kapoor, K., primary, Verma, S., additional, Sharma, P., additional, Mahajan, R., additional, Kaur, N., additional, Kaur, G., additional, Behera, B. R., additional, Singh, K. P., additional, Kumar, A., additional, Singh, H., additional, Dubey, R., additional, Saneesh, N., additional, Jhingan, A., additional, Sugathan, P., additional, Mohanto, G., additional, Nayak, B. K., additional, Saxena, A., additional, Sharma, H. P., additional, Chamoli, S. K., additional, Mukul, I., additional, and Singh, V., additional

Published
2017
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31. Study of nuclear fusion-fission dynamics in 16O+194Pt reaction

Author

Kapoor, K., primary, Verma, S., additional, Sharma, P., additional, Mahajan, R., additional, Kaur, N., additional, Kaur, G., additional, Behera, B. R., additional, Singh, K. P., additional, Singh, H., additional, Dubey, R., additional, Saneesh, N., additional, Jhingan, A., additional, Sugathan, P., additional, Mohanto, G., additional, Nayak, B. K., additional, Saxena, A., additional, Sharma, H. P., additional, Chamoli, S. K., additional, Mukul, I., additional, and Kumar, A., additional

Published
2017
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33. Study of Nuclear Fusion-Fission Dynamics in 16O+194Pt Reaction.

Author

Kapoor, K., Verma, S., Sharma, P., Mahajan, R., Kaur, N., Kaur, G., Behera, B. R., Singh, K. P., Singh, H., Dubey, R., Saneesh, N., Jhingan, A., Sugathan, P., Mohanto, G., Nayak, B. K., Saxena, A., Sharma, H. P., Chamoli, S. K., Mukul, I., and Kumar, A.

Subjects
NUCLEAR fusion, NUCLEAR reactions, SCISSION (Chemistry), NUCLEAR excitation, ALPHA rays
Abstract

Pre- and post-scission α-particle multiplicities have been measured for the reaction 16O + 194Pt at 98.4 MeV forming compound nucleus 210Rn. The α-particle’s yield has been measured in coincidence with the fission fragments at various angles. The moving source analysis was performed to extract the alpha particle multiplicity which yielded the contribution of pre- and postscission components. The pre-scission α-particle multiplicity has been compared with JOANNE2 statistical model code predictions to extract fission time scale and which is observed to be around 55zs (1zs=10-21s). [ABSTRACT FROM AUTHOR]

Published
2017
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34. STUDY THE FISSION DYNAMICS OF 225Pa NUCLEI AROUND THE SUB-BARRIER ENERGY.

Author

DUBEY, R., SUGATHAN, P., JHINGAN, A., BANERJEE, T., SANEESH, N., KAUR, G., THAKUR, M., MAHAJAN, R., MUKUL, I., and SIWAL, D.

Subjects
DYNAMICS, NUCLEAR fission, NUCLEAR fusion, PALLADIUM, NUCLEAR excitation
Abstract

225Pa nuclei exhibit a fusion-fission mechanism below the fusion barrier energy. Mass angle distribution measurements indicate absence of noncompound events at this bombarding energy. The effect of asymmetric fission mode on mass distribution of fission fragments is visible at low excitation energy (31.8 MeV). [ABSTRACT FROM AUTHOR]

Published
2016
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36. Spin distributions and cross sections of evaporation residues in the 28Si+176Yb reaction.

Author

Sudarshan, K., Tripathi, R., Sodaye, S., Sharma, S. K., Pujari, P. K., Gehlot, J., Madhavan, N., Nath, S., Mohanto, G., Mukul, I., Jhingan, A., and Mazumdar, I.

Subjects
*SILICON, *YTTERBIUM, *POLONIUM
Abstract

Background: Non-compound-nucleus fission in the preactinide region has been an active area of investigation in the recent past. Based on the measurements of fission-fragment mass distributions in the fission of 202Po, populated by reactions with varying entrance channel mass asymmetry, the onset of non-compound-nucleus fission was proposed to be around ZpZt~1000 [Phys. Rev. C 77, 024606 (2008)], where Zp and Zt are the projectile and target proton numbers, respectively. Purpose: The present paper is aimed at the measurement of cross sections and spin distributions of evaporation residues in the 28Si+176Yb reaction (ZpZt=980) to investigate the fusion hindrance which, in turn, would give information about the contribution from non-compound-nucleus fission in this reaction. Method: Evaporation-residue cross sections were measured in the beam energy range of 129-166 MeV using the hybrid recoil mass analyzer (HYRA) operated in the gas-filled mode. Evaporation-residue cross sections were also measured by the recoil catcher technique followed by off-line γ-ray spectrometry at few intermediate energies. γ-ray multiplicities of evaporation residues were measured to infer about their spin distribution. The measurements were carried out using NaI(Tl) detector-based 4p-spin spectrometer from the Tata Institute of Fundamental Research, Mumbai, coupled to the HYRA. Results: Evaporation-residue cross sections were significantly lower compared to those calculated using the statistical model code pace2 [Phys. Rev. C 21, 230 (1980)] with the coupled-channel fusion model code ccfus [Comput. Phys. Commun. 46, 187 (1987)] at beam energies close to the entrance channel Coulomb barrier. At higher beam energies, experimental cross sections were close to those predicted by the model. Average γ-ray multiplicities or angular momentum values of evaporation residues were in agreement with the calculations of the code ccfus + pace2 within the experimental uncertainties at all the beam energies. Conclusions: Deviation of evaporation-residue cross sections from the "fusion + statistical model" predictions at beam energies close to the entrance channel Coulomb barrier indicates fusion hindrance at these beam energies which would lead to non-compound-nucleus fission. However, reasonable agreement of average angular momentum values of evaporation residues at these beam energies with those calculated using the coupled-channel fusion model with the statistical model codes ccfus + pace2 suggests that fusion suppression at beam energies close to the entrance channel Coulomb barrier where populated l waves are low is not l dependent. [ABSTRACT FROM AUTHOR]

Published
2017
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37. Boulay et al. Reply.

Author

Boulay F, Simpson GS, Ichikawa Y, Kisyov S, Bucurescu D, Takamine A, Ahn DS, Asahi K, Baba H, Balabanski DL, Egami T, Fujita T, Fukuda N, Funayama C, Furukawa T, Georgiev G, Gladkov A, Hass M, Imamura K, Inabe N, Ishibashi Y, Kawaguchi T, Kawamura T, Kim W, Kobayashi Y, Kojima S, Kusoglu A, Lozeva R, Momiyama S, Mukul I, Niikura M, Nishibata H, Nishizaka T, Odahara A, Ohtomo Y, Ralet D, Sato T, Shimizu Y, Sumikama T, Suzuki H, Takeda H, Tao LC, Togano Y, Tominaga D, Ueno H, Yamazaki H, Yang XF, and Daugas JM

Published
2021
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38. 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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39. g Factor of the ^{99}Zr (7/2^{+}) Isomer: Monopole Evolution in the Shape-Coexisting Region.

Author

Boulay F, Simpson GS, Ichikawa Y, Kisyov S, Bucurescu D, Takamine A, Ahn DS, Asahi K, Baba H, Balabanski DL, Egami T, Fujita T, Fukuda N, Funayama C, Furukawa T, Georgiev G, Gladkov A, Hass M, Imamura K, Inabe N, Ishibashi Y, Kawaguchi T, Kawamura T, Kim W, Kobayashi Y, Kojima S, Kusoglu A, Lozeva R, Momiyama S, Mukul I, Niikura M, Nishibata H, Nishizaka T, Odahara A, Ohtomo Y, Ralet D, Sato T, Shimizu Y, Sumikama T, Suzuki H, Takeda H, Tao LC, Togano Y, Tominaga D, Ueno H, Yamazaki H, Yang XF, and Daugas JM

Abstract

The gyromagnetic factor of the low-lying E=251.96(9)  keV isomeric state of the nucleus ^{99}Zr was measured using the time-dependent perturbed angular distribution technique. This level is assigned a spin and parity of J^{π}=7/2^{+}, with a half-life of T_{1/2}=336(5)  ns. The isomer was produced and spin aligned via the abrasion-fission of a ^{238}U primary beam at RIKEN RIBF. A magnetic moment |μ|=2.31(14)μ_{N} was deduced showing that this isomer is not single particle in nature. A comparison of the experimental values with interacting boson-fermion model IBFM-1 results shows that this state is strongly mixed with a main νd_{5/2} composition. Furthermore, it was found that monopole single-particle evolution changes significantly with the appearance of collective modes, likely due to type-II shell evolution.

Published
2020
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