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202 results on '"Rajabali, M. M."'

1. Cross-shell excited configurations in the structure of 34Si

Author

Lubna, R. S., Garnsworthy, A. B., Tripathi, Vandana, Ball, G. C., Natzke, C. R., Rocchini, M., Andreoiu, C., Bhattacharjee, S. S., Dillmann, I., Garcia, F. H., Gillespie, S. A., Hackman, G., Griffin, C. J., Leckenby, G., Miyagi, T., Olaizola, B., Porzio, C., Rajabali, M. M., Saito, Y., Spagnoletti, P., Tabor, S. L., Umashankar, R., Vedia, V., Volya, A., Williams, J., and Yates, D.

Subjects
Nuclear Experiment
Abstract

The cross-shell excited states of $^{34}$Si have been investigated via $\beta$-decays of the $4^-$ ground state and the $1^+$ isomeric state of $^{34}$Al. Since the valence protons and valence neutrons occupy different major shells in the ground state as well as the intruder $1^+$ isomeric state of $^{34}$Al, intruder levels of $^{34}$Si are populated via allowed $\beta$ decays. Spin assignments to such intruder levels of $^{34}$Si were established through $\gamma$-$\gamma$ angular correlation analysis for the negative parity states with dominant configurations $(\nu d_{3/2})^{-1} \otimes (\nu f_{7/2})^{1}$ as well as the positive parity states with dominant configurations $(\nu sd)^{-2} \otimes (\nu f_{7/2}p_{3/2})^2$. The configurations of such intruder states play crucial roles in our understanding of the $N=20$ shell gap evolution. A configuration interaction model derived from the FSU Hamiltonian was utilized in order to interpret the intruder states in $^{34}$Si. Shell model interaction derived from a more fundamental theory with the Valence Space In Medium Similarity Renormalization Group (VS-IMSRG) method was also employed to interpret the structure of $^{34}$Si.

Published
2024
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2. Decay Spectroscopy of $^{160}$Eu: Quasiparticle Configurations of Excited States and Structure of $K^\pi$=$4^+$ Band-heads in $^{160}$Gd

Author

Yates, D., Kruecken, R., Dillmann, I., Garrett, P. E., Olaizola, B., Vedia, V., Ali, F. A., Andreoiu, C., Ashfield, W., Ball, G. C., Beadle, Z., Bernier, N., Bhattacharjee, S. S., Bidaman, H., Bildstein, V., Bishop, D., Bowry, M., Burbadge, C., Caballero-Folch, R., Chaney, D. Z., Cross, D. C., Varela, A. Diaz, Dunlop, M. R., Dunlop, R., Evitts, L. J., Garcia, F. H., Garnsworthy, A. B., Georges, S., Gillespie, S. A., Hackman, G., Henderson, J., Jigmeddorj, S., Lassen, J., Li, R., Luna, B. K., MacLean, A. D., Natzke, C. R., Petrache, C. M., Radich, A. J., Rajabali, M. M., Regan, P. H., Saito, Y., Smallcombe, J., Smith, J. K., Spieker, M., Svensson, C. E., Whitmore, A. Teigelhoefer K., and Zidar, T.

Subjects
Nuclear Experiment
Abstract

\noindent \textbf{Background:} Detailed spectroscopy of neutron-rich, heavy, deformed nuclei is of broad interest for nuclear astrophysics and nuclear structure. Nuclei in the r-process path and following freeze-out region impact the resulting r-process abundance distribution, and the structure of nuclei midshell in both proton and neutron number helps to understand the evolution of subshell gaps and large deformation in these nuclei. \noindent \textbf{Purpose:} To improve the understanding of the nuclear structure of $^{160}$Gd, specifically the $K^\pi$=$4^+$ bands, as well as study the $\beta$-decay of $^{160}$Eu into $^{160}$Gd. \noindent \textbf{Methods:} High-statistics decay spectroscopy of $^{160}$Gd resulting from the $\beta$-decay of $^{160}$Eu was collected using the GRIFFIN spectrometer at the TRIUMF-ISAC facility. \noindent \textbf{Results:} Two new excited states and ten new transitions were observed in $^{160}$Gd. The $\beta$-decaying half-lives of the low- and high-spin isomer in $^{160}$Eu were determined, and the low-spin state's half-life was measured to be $t_{1/2}=26.0(8)$~s, $\sim$16\% shorter than previous measurements. Lifetimes of the two $K^\pi$=$4^+$ band-heads in $^{160}$Gd were measured for the first time, as well as $\gamma$-$\gamma$ angular correlations and mixing ratios of intense transitions out of those band-heads. \noindent \textbf{Conclusions:} Lifetimes and mixing ratios suggest that the hexadecapole phonon model of the $K^\pi$=$4^+$ band-heads in $^{160}$Gd is preferred over a simple two-state strong mixing scenario, although further theoretical calculations are needed to fully understand these states. Additionally, the 1999.0 keV state in $^{160}$Gd heavily populated in $\beta$-decay is shown to have positive parity, which raises questions regarding the structure of the high-spin $\beta$-decaying state in $^{160}$Eu.

Published
2023
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3. First Evidence of Axial Shape Asymmetry and Configuration Coexistence in $^{74}$Zn: Suggestion for a Northern Extension of the $N=40$ Island of Inversion

Author

Rocchini, M., Garrett, P. E., Zielinska, M., Lenzi, S. M., Dao, D. D., Nowacki, F., Bildstein, V., MacLean, A. D., Olaizola, B., Ahmed, Z. T., Andreoiu, C., Babu, A., Ball, G. C., Bhattacharjee, S. S., Bidaman, H., Cheng, C., Coleman, R., Dillmann, I., Garnsworthy, A. B., Gillespie, S., Griffin, C. J., Grinyer, G. F., Hackman, G., Hanley, M., Illana, A., Jones, S., Laffoley, A. T., Leach, K. G., Lubna, R. S., McAfee, J., Natzke, C., Pannu, S., Paxman, C., Porzio, C., Radich, A. J., Rajabali, M. M., Sarazin, F., Schwarz, K., Shadrick, S., Sharma, S., Suh, J., Svensson, C. E., Yates, D., and Zidar, T.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The excited states of $N=44$ $^{74}$Zn were investigated via $\gamma$-ray spectroscopy following $^{74}$Cu $\beta$ decay. By exploiting $\gamma$-$\gamma$ angular correlation analysis, the $2_2^+$, $3_1^+$, $0_2^+$ and $2_3^+$ states in $^{74}$Zn were firmly established. The $\gamma$-ray branching and $E2/M1$ mixing ratios for transitions de-exciting the $2_2^+$, $3_1^+$ and $2_3^+$ states were measured, allowing for the extraction of relative $B(E2)$ values. In particular, the $2_3^+ \to 0_2^+$ and $2_3^+ \to 4_1^+$ transitions were observed for the first time. The results show excellent agreement with new microscopic large-scale shell-model calculations, and are discussed in terms of underlying shapes, as well as the role of neutron excitations across the $N=40$ gap. Enhanced axial shape asymmetry (triaxiality) is suggested to characterize $^{74}$Zn in its ground state. Furthermore, an excited $K=0$ band with a significantly larger softness in its shape is identified. A shore of the $N=40$ ``island of inversion'' appears to manifest above $Z=26$, previously thought as its northern limit in the chart of the nuclides.

Published
2023
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4. Single neutron transfer on 23Ne and its relevance forthepathway ofnucleosynthesis in astrophysical X-ray bursts

Author

Lotay, G., Henderson, J., Catford, W. N., Ali, F. A., Berean, J., Bernier, N., Bhattacharjee, S. S., Bowry, M., Caballero-Folch, R., Davids, B., Drake, T. E., Garnsworthy, A. B., GhaziMoradi, F., Gillespie, S. A., Greaves, B., Hackman, G., Hallam, S., Hymers, D., Kasanda, E., Levy, D., Luna, B. K., Mathews, A., Meisel, Z., Moukaddam, M., Muecher, D., Olaizola, B., Orr, N. A., Patel, H. P., Rajabali, M. M., Saito, Y., Smallcombe, J., Spencer, M., Svensson, C. E., Whitmore, K., and Williams, M.

Subjects
Nuclear Experiment
Abstract

We present new experimental measurements of resonance strengths in the astrophysical 23Al(p, {\gamma})24Si reaction, constraining the pathway of nucleosynthesis beyond 22Mg in X-ray burster scenarios. Specifically, we have performed the first measurement of the (d, p) reaction using a radioactive beam of 23Ne to explore levels in 24Ne, the mirror analog of 24Si. Four strong single-particle states were observed and corresponding neutron spectroscopic factors were extracted with a precision of {\sim}20{\%}. Using these spectroscopic factors, together with mirror state identifications, we have reduced uncertainties in the strength of the key {\ell} = 0 resonance at Er= 157 keV, in the astrophysical 23Al(p, {\gamma}) reaction, by a factor of 4. Our results show that the 22Mg(p, {\gamma})23Al(p, {\gamma}) pathway dominates over the competing 22Mg({\alpha}, p) reaction in all but the most energetic X-ray burster events (T>0.85GK), significantly affecting energy production and the preservation of hydrogen fuel., Comment: 5 pages, 3 figures

Published
2022
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5. Neutron detection efficiency of the Neutron dEtector with Xn Tracking (NEXT)

Author

Neupane, S., Heideman, J., Grzywacz, R., Hooker, J., Jones, K. L., Kitamura, N., Thornsberry, C. R., Heilbronn, L. H., Rajabali, M. M., Alberty-Jones, Y., Derkin, J., Massey, T., and Soltesz, D.

Subjects
Physics - Instrumentation and Detectors
Abstract

An efficient neutron detection system with good energy resolution is required to correctly characterize decays of neutron-rich nuclei where $\beta-$delayed neutron emission is a dominant decay mode. The Neutron dEtector with Xn Tracking (NEXT) has been designed to measure $\beta$-delayed neutron emitters. By segmenting the detector along the neutron flight path, NEXT reduces the associated uncertainties in neutron time-of-flight measurements, improving energy resolution while maintaining detection efficiency. Detector prototypes are comprised of optically separated segments of a neutron-gamma discriminating plastic scintillator coupled to position-sensitive photomultiplier tubes. The first performance studies of this detector showed that high intrinsic neutron detection efficiency could be achieved while retaining good energy resolution. The results from the efficiency measurements using neutrons from direct reactions are presented., Comment: 8 pages, 9 figures

Published
2021
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6. Absence of Low-Energy Shape Coexistence in $^{80}$Ge: The Nonobservation of a Proposed Excited 0$_2^+$ Level at 639 keV

Author

Garcia, F. H., Andreoiu, C., Ball, G. C., Bell, A., Garnsworthy, A. B., Nowacki, F., Petrache, C. M., Poves, A., Whitmore, K., Ali, F. A., Bernier, N., Bhattacharjee, S. S., Bowry, M., Coleman, R. J., Dillmann, I., Djianto, I., Forney, A. M., Gascoine, M., Hackman, G., Leach, K. G., Murphy, A. N., Natzke, C. R., Olaizola, B., Ortner, K., Peters, E. E., Rajabali, M. M., Raymond, K., Svensson, C. E., Umashankar, R., Williams, J., and Yates, D.

Subjects
Nuclear Experiment
Abstract

The $^{80}$Ge structure was investigated in a high-statistics $\beta$-decay experiment of $^{80}$Ga using the GRIFFIN spectrometer at TRIUMF-ISAC through $\gamma$, $\beta$-$e$, $e$-$\gamma$ and $\gamma$-$\gamma$ spectroscopy. No evidence was found for the recently reported 0$_2^{+}$ 639-keV level suggested as evidence for low-energy shape coexistence in $^{80}$Ge. Large-scale shell model calculations performed in $^{78,80,82}$Ge place the $0^{+}_{2}$ level in $^{80}$Ge at 2\,MeV. The new experimental evidence combined with shell model predictions indicate that low-energy shape coexistence is not present in $^{80}$Ge.

Published
2020
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7. Conceptual design and first results for a neutron detector with interaction localization capabilities

Author

Heideman, J., Perez-Loureiro, D., Grzywacz, R., Thornsberry, C. R., Chan, J., Heilbronn, L. H., Neupane, S. K., Schmitt, K., Rajabali, M. M., Engelhardt, A. R., Howell, C. W., Mostella, L. D., Owens, J. S., Shadrick, S. C., Peters, E. E., Ramirez, A. P. D., Yates, S. W., and Vaigneur, K.

Subjects
Physics - Instrumentation and Detectors
Abstract

A new high-precision detector for studying neutrons from beta-delayed neutron emission and direct reaction studies is proposed. The Neutron dEtector with Xn Tracking (NEXT) array is designed to maintain high intrinsic neutron detection efficiency while reducing uncertainties in neutron energy measurements. A single NEXT module is composed of thin segments of plastic scintillator, each optically separated, capable of neutron-gamma discrimination. Each segmented module is coupled to position sensitive photodetectors enabling the high-precision determination of neutron time of arrival and interaction position within the active volume. A design study has been conducted based on simulations and experimental tests leading to the construction of prototype units. First results from measurements using a $^{252}$Cf neutron source and accelerator-produced monoenergetic neutrons are presented., Comment: 17 pages, 21 Figures

Published
2019
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8. Segmented YSO scintillation detectors as a new ${\rm \beta}$-implant detection tool for decay spectroscopy in fragmentation facilities

Author

Yokoyama, R., Singh, M., Grzywacz, R., Keeler, A., King, T. T., Agramunt, J., Brewer, N. T., Go, S., Heideman, J., Liu, J., Nishimura, S., Parkhurst, P., Phong, V. H., Rajabali, M. M., Rasco, B. C., Rykaczewski, K. P., Stracener, D. W., Tain, J. L., Tolosa-Delgado, A., Vaigneur, K., and Wolińska-Cichocka, M.

Subjects
Physics - Instrumentation and Detectors
Abstract

A newly developed segmented YSO scintillator detector was implemented for the first time at the RI-beam Factory at RIKEN Nishina Center as an implantation-decay counter. The results from the experiment demonstrate that the detector is a viable alternative to conventional silicon-strip detectors with its good timing resolution and high detection efficiency for ${\rm \beta}$ particles. A Position-Sensitive Photo-Multiplier Tube (PSPMT) is coupled with a $48\times48$ segmented YSO crystal. To demonstrate its capabilities, a known short-lived isomer in $^{76}$Ni and the ${\rm \beta}$ decay of $^{74}$Co were measured by implanting those ions into the YSO detector. The half-lives and ${\rm \gamma}$-rays observed in this work are consistent with the known values. The ${\rm \beta}$-ray detection efficiency is more than 80~\% for the decay of $^{74}$Co., Comment: 17 pages, 6 figures, accepted to NIMA on May 7, 2019

Published
2019
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9. β -delayed neutron spectroscopy of Co70,72 ground-state and isomeric-state decays

Author

Siegl, K., primary, Keeler, A. M., additional, Grzywacz, R., additional, Brewer, N. T., additional, Crider, B. P., additional, Fijalkowska, A., additional, Go, S., additional, Hall, M., additional, Hamilton, J. H., additional, Ilyushkin, S. V., additional, King, T., additional, Liddick, S., additional, Madurga, M., additional, O'Malley, P. D., additional, Paulauskas, S. V., additional, Rajabali, M. M., additional, Taylor, S. Z., additional, Wang, E. H., additional, Xu, Z. Y., additional, and Zachary, C., additional

Published
2024
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10. Proton Shell Gaps in N=28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator

Author

Cox, I., primary, Xu, Z. Y., additional, Grzywacz, R., additional, Ong, W.-J., additional, Rasco, B. C., additional, Kitamura, N., additional, Hoskins, D., additional, Neupane, S., additional, Ruland, T. J., additional, Allmond, J. M., additional, King, T. T., additional, Lubna, R. S., additional, Rykaczewski, K. P., additional, Schatz, H., additional, Sherrill, B. M., additional, Tarasov, O. B., additional, Ayangeakaa, A. D., additional, Berg, H. C., additional, Bleuel, D. L., additional, Cerizza, G., additional, Christie, J., additional, Chester, A., additional, Davis, J., additional, Dembski, C., additional, Doetsch, A. A., additional, Duarte, J. G., additional, Estrade, A., additional, Fijałkowska, A., additional, Gray, T. J., additional, Good, E. C., additional, Haak, K., additional, Hanai, S., additional, Harke, J. T., additional, Harris, C., additional, Hermansen, K., additional, Hoff, D. E. M., additional, Jain, R., additional, Karny, M., additional, Kolos, K., additional, Laminack, A., additional, Liddick, S. N., additional, Longfellow, B., additional, Lyons, S., additional, Madurga, M., additional, Mogannam, M. J., additional, Nowicki, A., additional, Ogunbeku, T. H., additional, Owens-Fryar, G., additional, Rajabali, M. M., additional, Richard, A. L., additional, Ronning, E. K., additional, Rose, G. E., additional, Siegl, K., additional, Singh, M., additional, Spyrou, A., additional, Sweet, A., additional, Tsantiri, A., additional, Walters, W. B., additional, and Yokoyama, R., additional

Published
2024
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11. The GRIFFIN Facility for Decay-Spectroscopy Studies at TRIUMF-ISAC

Author

Garnsworthy, A. B., Svensson, C. E., Bowry, M., Dunlop, R., MacLean, A. D., Olaizola, B., Smith, J. K., Ali, F. A., Andreoiu, C., Ash, J. E., Ashfield, W. H., Ball, G. C., Ballast, T., Bartlett, C., Beadle, Z., Bender, P. C., Bernier, N., Bhattacharjee, S. S., Bidaman, H., Bildstein, V., Bishop, D., Boubel, P., Braid, R., Brennan, D., Bruhn, T., Burbadge, C., Cheeseman, A., Chester, A., Churchman, R., Ciccone, S., Caballero-Folch, R., Cross, D. S., Cruz, S., Davids, B., Varela, A. Diaz, Dillmann, I., Dunlop, M. R., Evitts, L. J., Garcia, F. H., Garrett, P. E., Georges, S., Gillespie, S., Gudapati, R., Hackman, G., Hadinia, B., Hallam, S., Henderson, J., Ilyushkin, S. V., Jigmeddorj, B., Kilic, A. I., Kisliuk, D., Kokke, R., Kuhn, K., Kruecken, R., Kuwabara, M., Laffoley, A. T., Lafleur, R., Leach, K. G., Leslie, J. R., Linn, Y., Lim, C., MacConnachie, E., Mathews, A. R., McGee, E., Measures, J., Miller, D., Mills, W. J., Moore, W., Morris, D., Morrison, L. N., Moukaddam, M., Natzke, C. R., Ortner, K., Padilla-Rodal, E., Paetkau, O., Park, J., Patel, H. P., Pearson, C. J., Peters, E., Peters, E. E., Pore, J. L., Radich, A. J., Rajabali, M. M., Rand, E. T., Raymond, K., Rizwan, U., Ruotsalainen, P., Saito, Y., Sarazin, F., Shaw, B., Smallcombe, J., Southall, D., Starosta, K., Ticu, M., Timakova, E., Turko, J., Umashankar, R., Unsworth, C., Wang, Z. M., Whitmore, K., Wong, S., Yates, S. W., Zganjar, E. F., and Zidar, T.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

Gamma-Ray Infrastructure For Fundamental Investigations of Nuclei, GRIFFIN, is a new high-efficiency $\gamma$-ray spectrometer designed for use in decay spectroscopy experiments with low-energy radioactive ion beams provided by TRIUMF's Isotope Separator and Accelerator (ISAC-I) facility. GRIFFIN is composed of sixteen Compton-suppressed large-volume clover-type high-purity germanium (HPGe) $\gamma$-ray detectors combined with a suite of ancillary detection systems and coupled to a custom digital data acquisition system. The infrastructure and detectors of the spectrometer as well as the performance characteristics and the analysis techniques applied to the experimental data are described.

Published
2018
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12. Cross-shell excited configurations in the structure of Si34

Author

Lubna, R. S., primary, Garnsworthy, A. B., additional, Tripathi, Vandana, additional, Ball, G. C., additional, Natzke, C. R., additional, Rocchini, M., additional, Andreoiu, C., additional, Bhattacharjee, S. S., additional, Dillmann, I., additional, Garcia, F. H., additional, Gillespie, S. A., additional, Hackman, G., additional, Griffin, C. J., additional, Leckenby, G., additional, Miyagi, T., additional, Olaizola, B., additional, Porzio, C., additional, Rajabali, M. M., additional, Saito, Y., additional, Spagnoletti, P., additional, Tabor, S. L., additional, Umashankar, R., additional, Vedia, V., additional, Volya, A., additional, Williams, J., additional, and Yates, D., additional

Published
2024
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13. High-precision quadrupole moment reveals significant intruder component in 33Al20 ground state

Author

Heylen, H., De Rydt, M., Neyens, G., Bissell, M. L., Caceres, L., Chevrier, R., Daugas, J. M., Ichikawa, Y., Ishibashi, Y., Kamalou, O., Mertzimekis, T. J., Morel, P., Papuga, J., Poves, A., Rajabali, M. M., Stodel, C., Thomas, J. C., Ueno, H., Utsuno, Y., Yoshida, N., and Yoshimi, A.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The electric quadrupole moment of the 33Al20 ground state, located at the border of the island of inversion, was obtained using continuous-beam beta-detected nuclear quadrupole resonance (beta-NQR). From the measured quadrupole coupling constant Q = 2.31(4) MHz in an alpha-Al2O3 crystal, a precise value for the electric quadrupole moment is extracted: Qs= 141(3) mb. A comparison with large-scale shell model calculations shows that 33Al has at least 50% intruder configurations in the ground state wave function, favoring the excitation of two neutrons across the N = 20 shell gap. 33Al therefore clearly marks the gradual transition north of the deformed Na and Mg nuclei towards the normal Z>14 isotopes., Comment: 6 pages, 4 figures. Accepted for publication in Physical Review C

Published
2016
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14. Measurement of Lifetimes in 23Mg

Author

Kirsebom, O. S., Bender, P., Cheeseman, A., Christian, G., Churchman, R., Cross, D. S., Davids, B., Evitts, L. J., Fallis, J., Galinski, N., Garnsworthy, A. B., Hackman, G., Lighthall, J., Ketelhut, S., Machule, P., Miller, D., Nobs, C. R., Pearson, C. J., Rajabali, M. M., Radich, A. J., Rojas, A., Ruiz, C., Sanetullaev, A., Unsworth, C. D., and Wrede, C.

Subjects
Nuclear Experiment
Abstract

Several lifetimes in 23Mg have been determined for the first time using the Doppler-shift attenuation method. A Monte Carlo simulation code has been written to model the gamma-ray line shape. An upper limit of 12 fs at the 95% C.L. has been obtained for the astrophysically important 7787 keV state.

Published
2015
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15. Shell structure of potassium isotopes deduced from their magnetic moments

Author

Papuga, J., Bissell, M. L., Kreim, K., Barbieri, C., Blaum, K., De Rydt, M., Duguet, T., Ruiz, R. F. Garcia, Heylen, H., Kowalska, M., Neugart, R., Neyens, G., Nortershauser, W., Rajabali, M. M., Sanchez, R., Smirnova, N., Soma, V., and Yordanov, D. T.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

\item[Background] Ground-state spins and magnetic moments are sensitive to the nuclear wave function, thus they are powerful probes to study the nuclear structure of isotopes far from stability. \item[Purpose] Extend our knowledge about the evolution of the $1/2^+$ and $3/2^+$ states for K isotopes beyond the $N = 28$ shell gap. \item[Method] High-resolution collinear laser spectroscopy on bunched atomic beams. \item[Results] From measured hyperfine structure spectra of K isotopes, nuclear spins and magnetic moments of the ground states were obtained for isotopes from $N = 19$ up to $N = 32$. In order to draw conclusions about the composition of the wave functions and the occupation of the levels, the experimental data were compared to shell-model calculations using SDPF-NR and SDPF-U effective interactions. In addition, a detailed discussion about the evolution of the gap between proton $1d_{3/2}$ and $2s_{1/2}$ in the shell model and {\it{ab initio}} framework is also presented. \item[Conclusions] The dominant component of the wave function for the odd-$A$ isotopes up to $^{45}$K is a $\pi 1d_{3/2}^{-1}$ hole. For $^{47,49}$K, the main component originates from a $\pi 2s_{1/2}^{-1}$ hole configuration and it inverts back to the $\pi 1d_{3/2}^{-1}$ in $^{51}$K. For all even-$A$ isotopes, the dominant configuration arises from a $\pi 1d_{3/2}^{-1}$ hole coupled to a neutron in the $\nu 1f_{7/2}$ or $\nu 2p_{3/2}$ orbitals. Only for $^{48}$K, a significant amount of mixing with $\pi 2s_{1/2}^{-1} \otimes \nu (pf)$ is observed leading to a $I^{\pi}=1^{-}$ ground state. For $^{50}$K, the ground-state spin-parity is $0^-$ with leading configuration $\pi 1d_{3/2}^{-1} \otimes \nu 2p_{3/2}^{-1}$., Comment: 12 pages, 10 figures, 7 tables

Published
2014
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16. β -delayed neutron emissions from N>50 gallium isotopes

Author

Yokoyama, R., primary, Grzywacz, R., additional, Rasco, B. C., additional, Brewer, N., additional, Rykaczewski, K. P., additional, Dillmann, I., additional, Tain, J. L., additional, Nishimura, S., additional, Ahn, D. S., additional, Algora, A., additional, Allmond, J. M., additional, Agramunt, J., additional, Baba, H., additional, Bae, S., additional, Bruno, C. G., additional, Caballero-Folch, R., additional, Calvino, F., additional, Coleman-Smith, P. J., additional, Cortes, G., additional, Davinson, T., additional, Domingo-Pardo, C., additional, Estrade, A., additional, Fukuda, N., additional, Go, S., additional, Griffin, C. J., additional, Ha, J., additional, Hall, O., additional, Harkness-Brennan, L. J., additional, Heideman, J., additional, Isobe, T., additional, Kahl, D., additional, Karny, M., additional, Kawano, T., additional, Khiem, L. H., additional, King, T. T., additional, Kiss, G. G., additional, Korgul, A., additional, Kubono, S., additional, Labiche, M., additional, Lazarus, I., additional, Liang, J., additional, Liu, J., additional, Lorusso, G., additional, Madurga, M., additional, Matsui, K., additional, Miernik, K., additional, Montes, F., additional, Morales, A. I., additional, Morrall, P., additional, Nepal, N., additional, Page, R. D., additional, Phong, V. H., additional, Piersa-Siłkowska, M., additional, Prydderch, M., additional, Pucknell, V. F. E., additional, Rajabali, M. M., additional, Rubio, B., additional, Saito, Y., additional, Sakurai, H., additional, Shimizu, Y., additional, Simpson, J., additional, Singh, M., additional, Stracener, D. W., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Tarifeño-Saldivia, A., additional, Thomas, S. L., additional, Tolosa-Delgado, A., additional, Wolińska-Cichocka, M., additional, Woods, P. J., additional, and Xu, X. X., additional

Published
2023
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17. Nuclear charge radii of potassium isotopes beyond N=28

Author

Kreim, K., Bissell, M. L., Papuga, J., Blaum, K., De Rydt, M., Ruiz, R. F. Garcia, Goriely, S., Heylen, H., Kowalska, M., Neugart, R., Neyens, G., Nörtershäuser, W., Rajabali, M. M., Alarcón, R. Sánchez, Stroke, H. H., and Yordanov, D. T.

Subjects
Nuclear Experiment
Abstract

We report on the measurement of optical isotope shifts for $^{38,39,42,44,46\text{-}51}$K relative to $^{47}$K from which changes in the nuclear mean square charge radii across the N=28 shell closure are deduced. The investigation was carried out by bunched-beam collinear laser spectroscopy at the CERN-ISOLDE radioactive ion-beam facility. Mean square charge radii are now known from $^{37}$K to $^{51}$K, covering all $\nu f_{7/2}$-shell as well as all $\nu p_{3/2}$-shell nuclei. These measurements, in conjunction with those of Ca, Cr, Mn and Fe, provide a first insight into the $Z$ dependence of the evolution of nuclear size above the shell closure at N=28.

Published
2013
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18. Spins and Magnetic Moments of $^{49}$K and $^{51}$K: establishing the 1/2$^+$ and 3/2$^+$ level ordering beyond $N$ = 28

Author

Papuga, J., Bissell, M. L., Kreim, K., Blaum, K., Brown, B. A., De Rydt, M., Ruiz, R. F. Garcia, Heylen, H., Kowalska, M., Neugart, R., Neyens, G., Nörtershäuser, W., Otsuka, T., Rajabali, M. M., Sánchez, R., Utsuno, Y., and Yordanov, D. T.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The ground-state spins and magnetic moments of $^{49,51}$K have been measured using bunched-beam high-resolution collinear laser spectroscopy at ISOLDE-CERN. For $^{49}$K a ground-state spin $I = 1/2$ was firmly established. The observed hyperfine structure of $^{51}$K requires a spin $I > 1/2$ and from its magnetic moment $\mu(^{51}\text{K})= +0.5129(22)\, \mu_N$ a spin/parity $I^\pi=3/2^+$ with a dominant $\pi 1d_{3/2}^{-1}$ hole configuration was deduced. This establishes for the first time the re-inversion of the single-particle levels and illustrates the prominent role of the residual monopole interaction for single-particle levels and shell evolution., Comment: 5 pages, 3 figures

Published
2013
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19. Production of spin-controlled rare isotope beams

Author

Ichikawa, Y., Ueno, H., Ishii, Y., Furukawa, T., Yoshimi, A., Kameda, D., Watanabe, H., Aoi, N., Asahi, K., Balabanski, D. L., Chevrier, R., Daugas, J. M., Fukuda, N., Georgiev, G., Hayashi, H., Iijima, H., Inabe, N., Inoue, T., Ishihara, M., Kubo, T., Nanao, T., Ohnishi, T., Suzuki, K., Tsuchiya, M., Takeda, H., and Rajabali, M. M.

Subjects
Nuclear Experiment
Abstract

The degree of freedom of spin in quantum systems serves as an unparalleled laboratory where intriguing quantum physical properties can be observed, and the ability to control spin is a powerful tool in physics research. We propose a novel method for controlling spin in a system of rare isotopes which takes advantage of the mechanism of the projectile fragmentation reaction combined with the momentum-dispersion matching technique. The present method was verified in an experiment at the RIKEN RI Beam Factory, in which a degree of alignment of 8% was achieved for the spin of a rare isotope Al-32. The figure of merit for the present method was found to be greater than that of the conventional method by a factor of more than 50., Comment: 18 pages, 5 figures

Published
2012
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20. Beta decay of 71,73Co; probing single particle states approaching doubly magic 78Ni

Author

Rajabali, M. M., Grzywacz, R., Liddick, S. N., Mazzocchi, C., Batchelder, J. C., Baumann, T., Bingham, C. R., Darby, I. G., Ginter, T. N., Ilyushkin, S. V., Karny, M., Królas, W., Mantica, P. F., Miernik, K., Pfützner, M., Rykaczewski, K. P., Weisshaar, D., and Winger, J. A.

Subjects
Nuclear Experiment
Abstract

Low-energy excited states in 71,73Ni populated via the {\beta} decay of 71,73Co were investigated in an experiment performed at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU). Detailed analysis led to the construction of level schemes of 71,73Ni, which are interpreted using systematics and analyzed using shell model calculations. The 5/2- states attributed to the the f5/2 orbital and positive parity 5/2+ and 7/2+ states from the g9/2 orbital have been identified in both 71,73Ni. In 71Ni the location of a 1/2- {\beta}-decaying isomer is proposed and limits are suggested as to the location of the isomer in 73Ni. The location of positive parity cluster states are also identified in 71,73Ni. Beta-delayed neutron branching ratios obtained from this data are given for both 71,73Co., Comment: Accepted for publication in PRC

Published
2012
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21. Decay spectroscopy of Eu160 : Quasiparticle configurations of excited states and structure of Kπ=4+ bandheads in Gd160

Author

Yates, D., primary, Krücken, R., additional, Dillmann, I., additional, Garrett, P. E., additional, Olaizola, B., additional, Vedia, V., additional, Ali, F. A., additional, Andreoiu, C., additional, Ashfield, W., additional, Ball, G. C., additional, Beadle, Z., additional, Bernier, N., additional, Bhattacharjee, S. S., additional, Bidaman, H., additional, Bildstein, V., additional, Bishop, D., additional, Bowry, M., additional, Burbadge, C., additional, Caballero-Folch, R., additional, Chaney, D. Z., additional, Cross, D. C., additional, Diaz Varela, A., additional, Dunlop, M. R., additional, Dunlop, R., additional, Evitts, L. J., additional, Garcia, F. H., additional, Garnsworthy, A. B., additional, Georges, S., additional, Gillespie, S. A., additional, Hackman, G., additional, Henderson, J., additional, Jigmeddorj, B., additional, Lassen, J., additional, Li, R., additional, Luna, B. K., additional, MacLean, A. D., additional, Natzke, C. R., additional, Petrache, C. M., additional, Radich, A. J., additional, Rajabali, M. M., additional, Regan, P. H., additional, Saito, Y., additional, Smallcombe, J., additional, Smith, J. K., additional, Spieker, M., additional, Svensson, C. E., additional, Teigelhöfer, A., additional, Whitmore, K., additional, and Zidar, T., additional

Published
2023
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22. First Evidence of Axial Shape Asymmetry and Configuration Coexistence in Zn74 : Suggestion for a Northern Extension of the N=40 Island of Inversion

Author

Rocchini, M., primary, Garrett, P. E., additional, Zielińska, M., additional, Lenzi, S. M., additional, Dao, D. D., additional, Nowacki, F., additional, Bildstein, V., additional, MacLean, A. D., additional, Olaizola, B., additional, Ahmed, Z. T., additional, Andreoiu, C., additional, Babu, A., additional, Ball, G. C., additional, Bhattacharjee, S. S., additional, Bidaman, H., additional, Cheng, C., additional, Coleman, R., additional, Dillmann, I., additional, Garnsworthy, A. B., additional, Gillespie, S., additional, Griffin, C. J., additional, Grinyer, G. F., additional, Hackman, G., additional, Hanley, M., additional, Illana, A., additional, Jones, S., additional, Laffoley, A. T., additional, Leach, K. G., additional, Lubna, R. S., additional, McAfee, J., additional, Natzke, C., additional, Pannu, S., additional, Paxman, C., additional, Porzio, C., additional, Radich, A. J., additional, Rajabali, M. M., additional, Sarazin, F., additional, Schwarz, K., additional, Shadrick, S., additional, Sharma, S., additional, Suh, J., additional, Svensson, C. E., additional, Yates, D., additional, and Zidar, T., additional

Published
2023
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23. Complete β -decay patterns of Cs142,Ba142, and La142 determined using total absorption spectroscopy

Author

Wolińska-Cichocka, M., primary, Rasco, B. C., additional, Rykaczewski, K. P., additional, Brewer, N. T., additional, Fijałkowska, A., additional, Karny, M., additional, Grzywacz, R. K., additional, Goetz, K. C., additional, Gross, C. J., additional, Stracener, D. W., additional, Zganjar, E. F., additional, Batchelder, J. C., additional, Blackmon, J. C., additional, Go, S., additional, Heffron, B., additional, Johnson, J., additional, King, T. T., additional, Matta, J. T., additional, Miernik, K., additional, Madurga, M., additional, McCutchan, E. A., additional, Miller, D., additional, Nesaraja, C. D., additional, Paulauskas, S. V., additional, Rajabali, M. M., additional, Taylor, S., additional, Sonzogni, A. A., additional, Wang, E. H., additional, Winger, J. A., additional, Xiao, Y., additional, and Zachary, C. J., additional

Published
2023
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24. First Evidence of Axial Shape Asymmetry and Configuration Coexistence in Zn74: Suggestion for a Northern Extension of the N=40 Island of Inversion

Author

Rocchini, M., Garrett, P. E., Zielińska, M., Lenzi, S. M., Dao, D. D., Nowacki, F., Bildstein, V., Maclean, A. D., Olaizola, B., Ahmed, Z. T., Andreoiu, C., Babu, A., Ball, G. C., Bhattacharjee, S. S., Bidaman, H., Cheng, C., Coleman, R., Dillmann, I., Garnsworthy, A. B., Gillespie, S., Griffin, C. J., Grinyer, G. F., Hackman, G., Hanley, M., Illana, A., Jones, S., Laffoley, A. T., Leach, K. G., Lubna, R. S., Mcafee, J., Natzke, C., Pannu, S., Paxman, C., Porzio, C., Radich, A. J., Rajabali, M. M., Sarazin, F., Schwarz, K., Shadrick, S., Sharma, S., Suh, J., Svensson, C. E., Yates, D., and Zidar, T.

Published
2023

25. Erratum to: New decay modes of the high-spin isomer of 124Cs

Author

Radich, A. J., Garrett, P. E., Andreoiu, C., Ball, G. C., Bianco, L., Bildstein, V., Chagnon-Lessard, S., Cross, D. S., Demand, G. A., Diaz Varela, A., Dunlop, R., Finlay, P., Garnsworthy, A. B., Hackman, G., Hadinia, B., Jigmeddorj, B., Laffoley, A. T., Leach, K. G., McGee, E., Michetti-Wilson, J., Orce, J. N., Rajabali, M. M., Rand, E. T., Starosta, K., Sumithrarachchi, C. S., Svensson, C. E., Triambak, S., Wang, Z. M., Williams, S. J., Wong, J., Wood, J. L, and Yates, S. W.

Published
2018
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26. Demonstration of the neutron tracking capability of NEXT array in time-of-flight measurements to improve energy resolution

Author

Neupane, S., primary, Heideman, J., additional, Grzywacz, R., additional, Cooper, M., additional, Hooker, J., additional, Jones, K. L., additional, King, T. T., additional, Kitamura, N., additional, Madurga, M., additional, Siegl, K., additional, Thornsberry, C. R., additional, Wagenknecht, P., additional, Xu, Z. Y., additional, Heilbronn, L. H., additional, Rajabali, M. M., additional, Chester, A., additional, Richard, A., additional, Alberty-Jones, Y., additional, Derkin, J., additional, Massey, T. N., additional, Soltesz, D., additional, Brewer, N. T., additional, Rasco, B. C., additional, Rykaczewski, K. P., additional, Wolinska-Cichocka, M., additional, Clark, J., additional, Santiago-Gonzales, D., additional, and Savard, G., additional

Published
2022
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27. β decay of neutron-rich Cu76 and the structure of Zn76

Author

Silwal, U., primary, Winger, J. A., additional, Ilyushkin, S. V., additional, Rykaczewski, K. P., additional, Gross, C. J., additional, Batchelder, J. C., additional, Cartegni, L., additional, Darby, I. G., additional, Grzywacz, R., additional, Korgul, A., additional, Królas, W., additional, Liddick, S. N., additional, Mazzocchi, C., additional, Mendez, A. J., additional, Padgett, S., additional, Rajabali, M. M., additional, Siwakoti, D. P., additional, Shapira, D., additional, Stracener, D. W., additional, and Zganjar, E. F., additional

Published
2022
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28. Study of the β - decay of 116m1In: A new interpretation of low-lying 0+ states in 116Sn

Author

Pore, J. L., Cross, D. S., Andreoiu, C., Ashley, R., Ball, G. C., Bender, P. C., Chester, A. S., Diaz Varela, A., Demand, G. A., Dunlop, R., Garnsworthy, A. B., Garrett, P. E., Hackman, G., Hadinia, B., Jigmeddorj, B., Laffoley, A. T., Liblong, A., Kanungo, R., Noakes, B., Petrache, C. M., Rajabali, M. M., Starosta, K., Svensson, C. E., Voss, P. J., Wang, Z. M., Wood, J. L., and Yates, S. W.

Published
2017
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29. Deciphering Nb98 β decay with the Modular Total Absorption Spectrometer at ORNL

Author

Rasco, B. C., primary, Rykaczewski, K. P., additional, Fijałkowska, A., additional, Karny, M., additional, Wolińska-Cichocka, M., additional, Grzywacz, R. K., additional, Stracener, D. W., additional, Zganjar, E. F., additional, Batchelder, J. C., additional, Blackmon, J. C., additional, Brewer, N. T., additional, Cooper, M. P., additional, Goetz, K. C., additional, Johnson, J. W., additional, King, T., additional, Laminack, A., additional, Matta, J. T., additional, Miernik, K., additional, Madurga, M., additional, Miller, D., additional, Rajabali, M. M., additional, Ruland, T., additional, Shuai, P., additional, Stepaniuk, M., additional, and Winger, J., additional

Published
2022
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30. Determination of β -decay feeding patterns of Rb88 and Kr88 using the Modular Total Absorption Spectrometer at ORNL HRIBF

Author

Shuai, P., primary, Rasco, B. C., additional, Rykaczewski, K. P., additional, Fijałkowska, A., additional, Karny, M., additional, Wolińska-Cichocka, M., additional, Grzywacz, R. K., additional, Gross, C. J., additional, Stracener, D. W., additional, Zganjar, E. F., additional, Batchelder, J. C., additional, Blackmon, J. C., additional, Brewer, N. T., additional, Go, S., additional, Cooper, M., additional, Goetz, K. C., additional, Johnson, J. W., additional, Jost, C. U., additional, King, T. T., additional, Matta, J. T., additional, Hamilton, J. H., additional, Laminack, A., additional, Miernik, K., additional, Madurga, M., additional, Miller, D., additional, Nesaraja, C. D., additional, Padgett, S., additional, Paulauskas, S. V., additional, Rajabali, M. M., additional, Ruland, T., additional, Stepaniuk, M., additional, Wang, E. H., additional, and Winger, J. A., additional

Published
2022
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31. New decay modes of the high-spin isomer of 124Cs

Author

Radich, A. J., Garrett, P. E., Andreoiu, C., Ball, G. C., Bianco, L., Bildstein, V., Chagnon-Lessard, S., Cross, D. S., Demand, G. A., Diaz Varela, A., Dunlop, R., Finlay, P., Garnsworthy, A. B., Hackman, G., Hadinia, B., Jigmeddorj, B., Laffoley, A. T., Leach, K. G., McGee, E., Michetti-Wilson, J., Orce, J. N., Rajabali, M. M., Rand, E. T., Starosta, K., Sumithrarachchi, C. S., Svensson, C. E., Triambak, S., Wang, Z. M., Williams, S. J., Wong, J., Wood, J. L, and Yates, S. W.

Published
2017
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32. Neutron emission from unbound states in 135Sn

Author

Grzywacz, Robert, Korgul, A, Madurga, M, Fraile, L M, Xu, Z, Piersa-Siłkowska, M, Benito, J, Algora, A, Allmond, J M, Bardayan, D, Bielak, P, Fijałkowska, A, Gaffney, L P, Guadilla, V, Heideman, J, Henrich, C, Neupane, S, King, T T, Kitamura, N, Koszuk, Ł, García Borge, M J, Illana, A, Janas, Z, Jones, K L, Kankainen, A, Karny, K, Kawano, T, Kolos, K, Kröll, T, Lama, A, Lică, R, Llanos, M, Morales, A I, Mazzocchi, C, Mihai, C, Miernik, K, Murias, J R, Orrigo, S E A, Page, R D, Podolyák, Zs, Poklepa, W, Rasco, B C, Rajabali, M M, Rubio, B, Rudigier, M, Rykaczewski, K, Siegl, K, Singh, M, Stepaniuk, M, Stryjczyk, M, Solak, K, Sotty, C, Tengblad, O, Tresckow, M, Warr, N, Wimmer, K, DeWitte, H, and Yokoyama, R

Subjects
Detectors and Experimental Techniques
Published
2021

33. Novel method for the production of spin-aligned RI beams in projectile fragmentation reaction with the dispersion matching technique

Author

Ichikawa, Y., Ueno, H., Ishii, Y., Furukawa, T., Yoshimi, A., Kameda, D., Watanabe, H., Aoi, N., Asahi, K., Balabanski, D. L., Chevrier, R., Daugas, J. M., Fukuda, N., Georgiev, G., Hayashi, H., Iijima, H., Inabe, N., Inoue, T., Ishihara, M., Kubo, T., Nanao, T., Ohnishi, T., Suzuki, K., Tsuchiya, M., Takeda, H., and Rajabali, M. M.

Published
2013
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35. Erratum: Properties of γ -decaying isomers and isomeric ratios in the Sn100 region [Phys. Rev. C 96 , 044311 (2017)]

Author

Park, J., primary, Krücken, R., additional, Lubos, D., additional, Gernhäuser, R., additional, Lewitowicz, M., additional, Nishimura, S., additional, Ahn, D. S., additional, Baba, H., additional, Blank, B., additional, Blazhev, A., additional, Boutachkov, P., additional, Browne, F., additional, Čeliković, I., additional, de France, G., additional, Doornenbal, P., additional, Faestermann, T., additional, Fang, Y., additional, Fukuda, N., additional, Giovinazzo, J., additional, Goel, N., additional, Górska, M., additional, Grawe, H., additional, Ilieva, S., additional, Inabe, N., additional, Isobe, T., additional, Jungclaus, A., additional, Kameda, D., additional, Kim, G. D., additional, Kim, Y.-K., additional, Kojouharov, I., additional, Kubo, T., additional, Kurz, N., additional, Lorusso, G., additional, Moschner, K., additional, Murai, D., additional, Nishizuka, I., additional, Patel, Z., additional, Rajabali, M. M., additional, Rice, S., additional, Sakurai, H., additional, Schaffner, H., additional, Shimizu, Y., additional, Sinclair, L., additional, Söderström, P.-A., additional, Steiger, K., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Wang, Z., additional, Watanabe, H., additional, Wu, J., additional, and Xu, Z. Y., additional

Published
2021
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36. Conversion electrons from high-statistics β-decay measurements with the 8π spectrometer at TRIUMF-ISAC

Author

Garrett P. E., Jigmeddorj B., Radich A. J., Andreoiu C., Ball G. C., Bangay J. C., Bianco L., Bildstein V., Chagnon-Lessard S., Cross D. S., Demand G. A., Diaz Varela A., Dunlop R., Finlay P., Garnsworthy A. B., Green K. L., Hackman G., Hadinia B., Leach K. G., Michetti-Wilson J., Orce J. N., Rajabali M. M., Rand E. T., Starosta K., Sumithrarachchi C., Svensson C. E., Triambak S., Wang Z. M., Williams S. J., Wood J. L., Wong J., Yates S. W., and Zganjar E. F.

Subjects
Physics, QC1-999
Abstract

The 8π spectrometer, located at TRIUMF-ISAC, was the world’s most powerful spectrometer dedicated to β-decay studies until its decommissioning in early 2014 for replacement with the GRIFFIN array. An integral part of the 8π spectrometer was the Pentagonal Array for Conversion Electron Spectroscopy (PACES) consisting of 5 Si(Li) detectors used for charged-particle detection. PACES enabled both γ − e− and e− − e− coincidence measurements, which were crucial for increasing the sensitivity for discrete e− lines in the presence of large backgrounds. Examples from a 124Cs decay experiment, where the data were vital for the expansion of the 124Cs decay scheme, are shown. With suffcient statistics, measurements of conversion coeffcients can be used to extract the E0 components of Jπ → Jπ transitions for J ≠ 0, which is demonstrated for data obtained in 110In→110Cd decay. With knowledge of the shapes of the states involved, as obtained, for example, from the use of Kumar-Cline shape invariants, the mixing of the states can be extracted.

Published
2016
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37. Spectroscopy of Cd 99 and in 101 from β decays of in 99 and Sn101

Author

Park, J, Krücken, R, Blazhev, A, Lubos, D, Gernhäuser, R, Lewitowicz, M, Nishimura, S, Ahn, D S, Baba, H, Blank, B, Boutachkov, P, Browne, F, Čeliković, Igor T., de France, G., Doornenbal, P, Faestermann, T, Fang, Y, Fukuda, N, Giovinazzo, J, Goel, N, Górska, M, Grawe, H, Ilieva, S, Inabe, N, Isobe, T, Jungclaus, A, Kameda, D, Kim, G. D., Kim, Y.-K., Kojouharov, I, Kubo, T, Kurz, N, Kwon, Y K, Lorusso, G, Moschner, K, Murai, D, Nishizuka, I, Patel, Z, Rajabali, M M, Rice, S, Sakurai, H, Schaffner, H, Shimizu, Y, Sinclair, L, Söderström, P.-A., Steiger, K, Sumikama, T, Suzuki, H, Takeda, H, Wang, Z, Watanabe, H, Wu, J, and Xu, Z Y

Subjects
Astrophysics::High Energy Astrophysical Phenomena
Abstract

We report on new γ-ray spectroscopy results from β decays of In99 and Sn101. 30 new γ rays were observed following the β decay of In99, and inconsistencies in the literature with respect to the γ rays following the β decay of Sn101 were addressed with two confirmed cases and two new transitions. The experimental γ-ray energies, intensities, and coincidence relationships are discussed with shell model calculations, where theoretical β-decay branching ratios from the parent nuclei and γ-ray cascades of excited states from the daughter nuclei were combined to generate hypothetical βγ spectra and βγγ coincidence matrices. The most intense β-delayed γ-ray branches in both Cd99 and In101 were well reproduced with this approach, and several γ rays were assigned to new excited states based on their good agreement with shell model predictions.

Published
2020

38. Erratum: Direct Lifetime Measurements of the Excited States in 72Ni (Physical Review Letters (2016) 116 (122502) DOI: 10.1103/PhysRevLett.116.122502)

Author

Kolos, K., Miller, D., Grzywacz, R., Iwasaki, H., Al-Shudifat, M., Bazin, D., Bingham, C. R., Braunroth, T., Cerizza, G., Gade, A., Lemasson, A., Liddick, S. N., Madurga, M., Morse, C., Portillo, M., Rajabali, M. M., Recchia, F., Riedinger, L. L., Voss, P., Walters, W. B., Weisshaar, D., Whitmore, K., Wimmer, K., and Tostevin, J. A.

Published
2020

39. Absence of Low-Energy Shape Coexistence in $^{80}\mathrm{Ge}$: The Nonobservation of a Proposed Excited ${0}_{2}^{+}$ Level at 639 keV

Author

Garcia, F. H., Andreoiu, C., Ball, G. C., Bell, A., Garnsworthy, A. B., Nowacki, F., Petrache, C. M., Poves, A., Whitmore, K., Ali, F. A., Bernier, N., Bhattacharjee, S. S., Bowry, M., Coleman, R. J., Dillmann, I., Djianto, I., Forney, A. M., Gascoine, M., Hackman, G., Leach, K. G., Murphy, A. N., Natzke, C. R., Olaizola, B., Ortner, K., Peters, E. E., Rajabali, M. M., Raymond, K., Svensson, C. E., Umashankar, R., Williams, J., Yates, D., Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

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

The $^{80}$Ge structure was investigated in a high-statistics $\beta$-decay experiment of $^{80}$Ga using the GRIFFIN spectrometer at TRIUMF-ISAC through $\gamma$, $\beta$-$e$, $e$-$\gamma$ and $\gamma$-$\gamma$ spectroscopy. No evidence was found for the recently reported 0$_2^{+}$ 639-keV level suggested as evidence for low-energy shape coexistence in $^{80}$Ge. Large-scale shell model calculations performed in $^{78,80,82}$Ge place the $0^{+}_{2}$ level in $^{80}$Ge at 2\,MeV. The new experimental evidence combined with shell model predictions indicate that low-energy shape coexistence is not present in $^{80}$Ge.

Published
2020

40. Mapping of fragmented νf5/2→πf7/2 transitions in the Co73→Ni73 decay

Author

Go, S., primary, Grzywacz, R., additional, Mazzocchi, C., additional, Liddick, S. N., additional, Alshudifat, M., additional, Batchelder, J. C., additional, Baumann, T., additional, Ciemny, A. A., additional, Ginter, T. N., additional, Gross, C. J., additional, Kolos, K., additional, Korgul, A., additional, Paulauskas, S. V., additional, Prokop, C. J., additional, Rajabali, M. M., additional, Rykaczewski, K. P., additional, Taylor, S., additional, and Xiao, Y., additional

Published
2020
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41. Absence of Low-Energy Shape Coexistence in Ge80 : The Nonobservation of a Proposed Excited 02+ Level at 639 keV

Author

Garcia, F. H., primary, Andreoiu, C., additional, Ball, G. C., additional, Bell, A., additional, Garnsworthy, A. B., additional, Nowacki, F., additional, Petrache, C. M., additional, Poves, A., additional, Whitmore, K., additional, Ali, F. A., additional, Bernier, N., additional, Bhattacharjee, S. S., additional, Bowry, M., additional, Coleman, R. J., additional, Dillmann, I., additional, Djianto, I., additional, Forney, A. M., additional, Gascoine, M., additional, Hackman, G., additional, Leach, K. G., additional, Murphy, A. N., additional, Natzke, C. R., additional, Olaizola, B., additional, Ortner, K., additional, Peters, E. E., additional, Rajabali, M. M., additional, Raymond, K., additional, Svensson, C. E., additional, Umashankar, R., additional, Williams, J., additional, and Yates, D., additional

Published
2020
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42. Novel method for the production of spin-aligned RI beams in projectile fragmentation reaction with the dispersion matching technique

Author

Ichikawa, Y., primary, Ueno, H., additional, Ishii, Y., additional, Furukawa, T., additional, Yoshimi, A., additional, Kameda, D., additional, Watanabe, H., additional, Aoi, N., additional, Asahi, K., additional, Balabanski, D. L., additional, Chevrier, R., additional, Daugas, J. M., additional, Fukuda, N., additional, Georgiev, G., additional, Hayashi, H., additional, Iijima, H., additional, Inabe, N., additional, Inoue, T., additional, Ishihara, M., additional, Kubo, T., additional, Nanao, T., additional, Ohnishi, T., additional, Suzuki, K., additional, Tsuchiya, M., additional, Takeda, H., additional, and Rajabali, M. M., additional

Published
2012
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43. Spectroscopy of Cd99 and In101 from β decays of In99 and Sn101

Author

Park, J., primary, Krücken, R., additional, Blazhev, A., additional, Lubos, D., additional, Gernhäuser, R., additional, Lewitowicz, M., additional, Nishimura, S., additional, Ahn, D. S., additional, Baba, H., additional, Blank, B., additional, Boutachkov, P., additional, Browne, F., additional, Čeliković, I., additional, de France, G., additional, Doornenbal, P., additional, Faestermann, T., additional, Fang, Y., additional, Fukuda, N., additional, Giovinazzo, J., additional, Goel, N., additional, Górska, M., additional, Grawe, H., additional, Ilieva, S., additional, Inabe, N., additional, Isobe, T., additional, Jungclaus, A., additional, Kameda, D., additional, Kim, G. D., additional, Kim, Y.-K., additional, Kojouharov, I., additional, Kubo, T., additional, Kurz, N., additional, Kwon, Y. K., additional, Lorusso, G., additional, Moschner, K., additional, Murai, D., additional, Nishizuka, I., additional, Patel, Z., additional, Rajabali, M. M., additional, Rice, S., additional, Sakurai, H., additional, Schaffner, H., additional, Shimizu, Y., additional, Sinclair, L., additional, Söderström, P.-A., additional, Steiger, K., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Wang, Z., additional, Watanabe, H., additional, Wu, J., additional, and Xu, Z. Y., additional

Published
2020
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44. Publisher’s Note: Direct Lifetime Measurements of the Excited States in Ni72 [Phys. Rev. Lett. 116 , 122502 (2016)]

Author

Kolos, K., primary, Miller, D., additional, Grzywacz, R., additional, Iwasaki, H., additional, Al-Shudifat, M., additional, Bazin, D., additional, Bingham, C. R., additional, Braunroth, T., additional, Cerizza, G., additional, Gade, A., additional, Lemasson, A., additional, Liddick, S. N., additional, Madurga, M., additional, Morse, C., additional, Portillo, M., additional, Rajabali, M. M., additional, Recchia, F., additional, Riedinger, L. L., additional, Voss, P., additional, Walters, W. B., additional, Weisshaar, D., additional, Whitmore, K., additional, Wimmer, K., additional, and Tostevin, J. A., additional

Published
2020
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45. α -decay properties of Fr200,202

Author

Ghys, L., primary, Andreyev, A. N., additional, Huyse, M., additional, Van Duppen, P., additional, Antalic, S., additional, Barzakh, A., additional, Capponi, L., additional, Cocolios, T. E., additional, Cubiss, J., additional, Derkx, X., additional, De Witte, H., additional, Elseviers, J., additional, Hessberger, F. P., additional, Kalaninová, Z., additional, Köster, U., additional, Lane, J. F. W., additional, Liberati, V., additional, Mitsuoka, S., additional, Nagame, Y., additional, Nishio, K., additional, Ota, S., additional, Pauwels, D., additional, Page, R. D., additional, Popescu, L., additional, Radulov, D., additional, Rajabali, M. M., additional, Rapisarda, E., additional, Sandhu, K., additional, Truesdale, V. L., additional, Van den Bergh, P., additional, and Wakabayashi, Y., additional

Published
2019
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46. Improved Value for the Gamow-Teller Strength of the Sn 100 Beta Decay

Author

Lubos, D., Park, J., Faestermann, T., Gernhäuser, R., Krücken, R., Lewitowicz, M., Nishimura, S., Sakurai, H., Ahn, D.S., Baba, H., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., Celikovic, I., De France, G., Doornenbal, P., Fang, Y., Fukuda, N., Giovinazzo, J., Goel, N., Górska, M., Ilieva, S., Inabe, N., Isobe, T., Jungclaus, Andrea, Kameda, D., Kim, Y. K., Kojouharov, I., Kubo, T., Kurz, N., Kwon, Y. K., Lorusso, G., Moschner, K., Murai, D., Nishizuka, I., Patel, Z., Rajabali, M. M., Rice, S., Schaffner, H., Shimizu, Y., Sinclair, L., Söderström, P. A., Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Wang, Z., Warr, N., RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, German Research Foundation, Federal Ministry of Science, Research and Economy (Germany), Ministry of Education, Science and Technology (South Korea), National Research Foundation of Korea, Natural Sciences and Engineering Research Council of Canada, and Ministerio de Ciencia, Innovación y Universidades (España)

Abstract

6 pags., 4 figs., A record number of Sn100 nuclei was detected and new isotopic species toward the proton dripline were discovered at the RIKEN Nishina Center. Decay spectroscopy was performed with the high-efficiency detector arrays WAS3ABi and EURICA. Both the half-life and the β-decay end point energy of Sn100 were measured more precisely than the literature values. The value and the uncertainty of the resulting strength for the pure 0+→1+ Gamow-Teller decay was improved to BGT=4.4-0.7+0.9. A discrimination between different model calculations was possible for the first time, and the level scheme of In100 is investigated further., This work was carried out at the RIBF operated by RIKEN Nishina Center, RIKEN and CNS, University of Tokyo. It was supported and financed by the DFG cluster of excellence “Origin and Structure of the Universe,” the German BMBF under Contracts No. 05P12WOFNF and No. 05P15PKFNA, the Hanns-Seidel-Stiftung, and the RIKEN IPA Programme. We wish to acknowledge the EURICA RIBF09 collaboration as well as the support on the WAS3ABi setup from the Rare Isotope Science Project, funded by the Ministry of Education, Science and Technology and National Research Foundation of Korea KAKENHI (Grant No. 25247045). Part of the research was also funded by the Natural Sciences and Engineering Research Council of Canada, supported by FJNSP LIA (French-Japanese International Associated Laboratory for Nuclear Structure Problems) and by the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2017-84756-C4-2-P.

Published
2019

47. Toward the limit of nuclear binding on the N=Z line : Spectroscopy of Cd 96

Author

Davies, P. J., Park, J., Grawe, H., Wadsworth, R., Gernhäuser, R., Krücken, R., Nowacki, F., Ahn, D. S., Ameil, F., Baba, H., Bäck, T., Blank, B., Blazhev, A., Boutachkov, P., Browne, F., Čeliković, I., Dewald, M., Doornenbal, P., Faestermann, T., Fang, Y., De France, G., Fukuda, N., Gengelbach, A., Gerl, J., Giovinazzo, J., Go, S., Goel, N., Górska, M., Gregor, E., Hotaka, H., Ilieva, S., Inabe, N., Isobe, T., Jenkins, D. G., Jolie, J., Jung, H. S., Jungclaus, A., Kameda, D., Kim, G. D., Kim, Y. K., Kojouharov, I., Kubo, T., Kurz, N., Lewitowicz, M., Lorusso, G., Lubos, D., Maier, L., Merchan, E., Moschner, K., Murai, D., Naqvi, F., Nishibata, H., Nishimura, D., Nishimura, S., Nishizuka, I., Patel, Z., Pietralla, N., Rajabali, M. M., Rice, S., Sakurai, H., Schaffner, H., Shimizu, Y., Sinclair, L. F., Söderström, P. A., Steiger, K., Sumikama, T., Suzuki, H., Takeda, H., Taprogge, J., Thöle, P., Valder, S., Wang, Z., Warr, N., Watanabe, H., Werner, V., Wu, J., Xu, Z. Y., Yagi, A., Yoshinaga, K., and Zhu, Y.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

A γ-decaying isomeric state (τ1/2=197-17+19 ns) has been identified in Cd96, which is one α particle away from the last known bound N=Z nucleus, Sn100. Comparison of the results with shell-model calculations has allowed a tentative experimental level scheme to be deduced and the isomer to be interpreted as a medium-spin negative-parity spin trap based on the coupling of isoscalar (T=0) and isovector (T=1) neutron-proton pairs. The data also suggest evidence for the population of a 9+ T=1 state, which is predicted by shell-model calculations to be yrast. Such a low-lying T=1 state, which is unknown in lighter mass even-even self-conjugate nuclei, can also be interpreted in terms of the coupling of T=0 and T=1 neutron-proton pairs.

Published
2019

48. $\alpha$-decay properties of $^{200,202}$FR

Author

Ghys, L., Andreyev, A. N., Huyse, M., Van Duppen, P., Antalic, S., Barzakh, A., Capponi, L., Cocolios, T. E., Cubiss, J., Derkx, X., De Witte, H., Elseviers, J., Hessberger, F. P., Kalaninová, Z., Köster, U., Lane, J. F. W., Liberati, V., Mitsuoka, S., Nagame, Y., Nishio, K., Ota, S., Pauwels, D., Page, R. D., Popescu, L., Radulov, D., Rajabali, M. M., Rapisarda, E., Sandhu, K., Truesdale, V. L., Van den Bergh, P., Wakabayashi, Y., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Laue-Langevin (ILL), ILL, and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
ddc:530, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Structure
Abstract

International audience; Background: The neutron-deficient lead region provides a range of nuclear phenomena, including isomerism at low energies. This phenomenon can be studied by α decay because the degree of hindrance of α decay provides information on the change in nuclear structure of connected states. Purpose: The aim of this work was to investigate the α-decay properties of $^{200,202}$FR and daughter products. Method: Neutron-deficient francium nuclei are produced at ISOLDE-CERN bombarding a UCx target with 1.4 GeV protons. Surface ionization and mass-separation techniques were employed to provide a pure radioactive ion beam at a radiation-detection setup. Results: Due to the very high statistics and the high beam purity, improved decay data for $^{202}$FR and its daughters were obtained. In particular, this data set allowed us to identify many fine-structure α lines with a relative reduced α-decay width up to five orders of magnitude lower as the strongest ground-to-ground state or isomeric-to-isomeric state α-decay transition. In addition, several half-life values were extracted with similar or better precision as compared with the literature. Conclusions: The observation of crossover transitions positioned the isomeric high-spin level of $^{198}$At at an excitation energy of 265(3) keV. Half-life values of 4.47(5) s and 1.28(10) s were extracted for the ground state and isomeric state of $^{198}$At and 52(3) ms for the ground-state decay of $^{200}$FR. Furthermore, α-decay schemes for Fr202 and its daughter $^{198}$At could be constructed.

Published
2019

49. Segmented YSO scintillation detectors as a new ${\rm ��}$-implant detection tool for decay spectroscopy in fragmentation facilities

Author

Yokoyama, R., Singh, M., Grzywacz, R., Keeler, A., King, T. T., Agramunt, J., Brewer, N. T., Go, S., Heideman, J., Liu, J., Nishimura, S., Parkhurst, P., Phong, V. H., Rajabali, M. M., Rasco, B. C., Rykaczewski, K. P., Stracener, D. W., Tain, J. L., Tolosa-Delgado, A., Vaigneur, K., and Woli��ska-Cichocka, M.

Subjects
Physics::Instrumentation and Detectors, FOS: Physical sciences, High Energy Physics::Experiment, Instrumentation and Detectors (physics.ins-det)
Abstract

A newly developed segmented YSO scintillator detector was implemented for the first time at the RI-beam Factory at RIKEN Nishina Center as an implantation-decay counter. The results from the experiment demonstrate that the detector is a viable alternative to conventional silicon-strip detectors with its good timing resolution and high detection efficiency for ${\rm ��}$ particles. A Position-Sensitive Photo-Multiplier Tube (PSPMT) is coupled with a $48\times48$ segmented YSO crystal. To demonstrate its capabilities, a known short-lived isomer in $^{76}$Ni and the ${\rm ��}$ decay of $^{74}$Co were measured by implanting those ions into the YSO detector. The half-lives and ${\rm ��}$-rays observed in this work are consistent with the known values. The ${\rm ��}$-ray detection efficiency is more than 80~\% for the decay of $^{74}$Co., 17 pages, 6 figures, accepted to NIMA on May 7, 2019

Published
2019
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50. Improved Value for the Gamow-Teller Strength of the Sn100 Beta Decay

Author

Lubos, D, Park, J, Faestermann, T, Gernhäuser, R, Baba, H, Blank, B, Blazhev, A, Boutachkov, P, Browne, F, Čeliković, Igor T., de France, G., Doornenbal, P, Fang, Y, Fukuda, N, Giovinazzo, J, Goel, N, Górska, M, Ilieva, S, Inabe, N, Isobe, T, Jungclaus, A, Kameda, D, Kim, Y. K., Kojouharov, I, Kubo, T, Kurz, N, Kwon, Y. K., Lorusso, G, Moschner, K, Murai, D, Nishizuka, I, Patel, Z, Rajabali, M. M., Rice, S, Schaffner, H, Shimizu, Y, Sinclair, L, Söderström, P.-A., Steiger, K, Sumikama, T, Suzuki, H, Takeda, H, Wang, Z, Warr, N, Watanabe, H, Wu, J, and Xu, Z

Subjects
Level schemes, High-efficiency, Model calculations, End points, Half lives, Detector arrays, Decay spectroscopies, Isotopic species
Abstract

A record number of Sn100 nuclei was detected and new isotopic species toward the proton dripline were discovered at the RIKEN Nishina Center. Decay spectroscopy was performed with the high-efficiency detector arrays WAS3ABi and EURICA. Both the half-life and the β-decay end point energy of Sn100 were measured more precisely than the literature values. The value and the uncertainty of the resulting strength for the pure 0+→1+ Gamow-Teller decay was improved to BGT=4.4-0.7+0.9. A discrimination between different model calculations was possible for the first time, and the level scheme of In100 is investigated further. © 2019 American Physical Society.

Published
2019

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