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145 results on '"King, T. T."'

1. Strength measurement of the $E_{\alpha}^{lab}$ = 830 keV resonance in $^{22}\rm{Ne}(\alpha,n)^{25}\rm{Mg}$ reaction using a stilbene detector

Author

Shahina, deBoer, R. J., Gorres, J., Fang, R., Febbraro, M., Kelmar, R., Matney, M., Manukyan, K., Nattress, J. T., Robles, E., Ruland, T. J., King, T. T., Sanchez, A., Sidhu, R. S., Stech, E., and Wiescher, M.

Subjects
Nuclear Experiment
Abstract

The interplay between the $^{22}$Ne$(\alpha,\gamma)^{26}$Mg and the competing $^{22}$Ne$(\alpha,n)^{25}$Mg reactions determines the efficiency of the latter as a neutron source at the temperatures of stellar helium burning. In both cases, the rates are dominated by the $\alpha$-cluster resonance at 830 keV. This resonance plays a particularly important role in determining the strength of the neutron flux for both the weak and main $s$-process as well as the $n$-process. Recent experimental studies based on transfer reactions suggest that the neutron and $\gamma$-ray strengths for this resonance are approximately equal. In this study, the $^{22}$Ne$(\alpha,n)^{25}$Mg resonance strength has been remeasured and found to be similar to the previous direct studies. This reinforces an 830 keV resonance strength that is approximately a factor of three larger for the $^{22}$Ne$(\alpha,n)^{25}$Mg reaction than for the $^{22}$Ne$(\alpha,\gamma)^{26}$Mg reaction.

Published
2024
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2. Towards the Discovery of New Elements: Production of Livermorium (Z=116) with 50Ti

Author

Gates, J. M., Orford, R., Rudolph, D., Appleton, C., Barrios, B. M., Benitez, J. Y., Bordeau, M., Botha, W., Campbell, C. M., Chadderton, J., Chemey, A. T., Clark, R. M., Crawford, H. L., Despotopulos, J. D., Dorvaux, O., Esker, N. E., Fallon, P., Folden III, C. M., Gall, B. J. P., Garcia, F. H., Golubev, P., Gooding, J. A., Grebo, M., Gregorich, K. E., Guerrero, M., Henderson, R. A., Herzberg, R. -D., Hrabar, Y., King, T. T., Covo, M. Kireeff, Kirkland, A. S., Krücken, R., Leistenschneider, E., Lykiardopoulou, E. M., McCarthy, M., Mildon, J. A., Müller-Gatermann, C., Phair, L., Pore, J. L., Rice, 1 E., Rykaczewski, K. P., Sammis, B. N., Sarmiento, L. G., Seweryniak, D., Sharp, D. K., Sinjari, A., Steinegger, P., Stoyer, M. A., Szornel, J. M., Thomas, K., Todd, D. S., Vo, P., Watson, V., and Wooddy, P. T.

Subjects
Nuclear Experiment
Abstract

The $^{244}$Pu($^{50}$Ti,$xn$)$^{294-x}$Lv reaction was investigated at Lawrence Berkeley National Laboratory's 88-Inch Cyclotron facility. The experiment was aimed at the production of a superheavy element with $Z\ge 114$ by irradiating an actinide target with a beam heavier than $^{48}$Ca. Produced Lv ions were separated from the unwanted beam and nuclear reaction products using the Berkeley Gas-filled Separator and implanted into a newly commissioned focal plane detector system. Two decay chains were observed and assigned to the decay of $^{290}$Lv. The production cross section was measured to be $\sigma_{\rm prod}=0.44(^{+58}_{-28})$~pb at a center-of-target center-of-mass energy of 220(3)~MeV. This represents the first published measurement of the production of a superheavy element near the `Island-of-Stability', with a beam of $^{50}$Ti and is an essential precursor in the pursuit of searching for new elements beyond $Z=118$., Comment: Submitted to Physical Review Letters

Published
2024

3. Suppressed Electric Quadrupole Collectivity in $^{49}$Ti

Author

Gray, T. J., Allmond, J. M., Benetti, C., Wibisono, C., Baby, L., Gargano, A., Miyagi, T., Macchiavelli, A. O., Stuchbery, A. E., Wood, J. L., Ajayi, S., Aragon, J., Asher, B. W., Barber, P., Bhattacharya, S., Boisseau, R., Christie, J. M., Conley, A. L., De Rosa, P., Dowling, D. T., Esparza, C., Gibbons, J., Hanselman, K., Holt, J. D., Lopez-Caceres, S., Saavedra, E. Lopez, McCann, G. W., Morelock, A., Kelly, B., King, T. T., Rasco, B. C., Sitaraman, V., Tabor, S. L., Temanson, E., Tripathi, V., Wiedenhöver, I., and Yadav, R. B.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Single-step Coulomb excitation of $^{46,48,49,50}$Ti is presented. A complete set of $E2$ matrix elements for the quintuplet of states in $^{49}$Ti, centered on the $2^+$ core excitation, was measured for the first time. A total of nine $E2$ matrix elements are reported, four of which were previously unknown. $^{49}_{22}$Ti$_{27}$ shows a $20\%$ quenching in electric quadrupole transition strength as compared to its semi-magic $^{50}_{22}$Ti$_{28}$ neighbour. This $20\%$ quenching, while empirically unprecedented, can be explained with a remarkably simple two-state mixing model, which is also consistent with other ground-state properties such as the magnetic dipole moment and electric quadrupole moment. A connection to nucleon transfer data and the quenching of single-particle strength is also demonstrated. The simplicity of the $^{49}$Ti-$^{50}$Ti pair (i.e., approximate single-$j$ $0f_{7/2}$ valence space and isolation of yrast states from non-yrast states) provides a unique opportunity to disentangle otherwise competing effects in the ground-state properties of atomic nuclei, the emergence of collectivity, and the role of proton-neutron interactions., Comment: 8 pages, 5 figures, accepted in Physics Letters B

Published
2024

4. 133In: A Rosetta Stone for decays of r-process nuclei

Author

Xu, Z. Y., Madurga, M., Grzywacz, R., King, T. T., Algora, A., Andreyev, A. N., Benito, J., Berry, T., Borge, M. J. G., Costache, C., De Witte, H., Fijalkowska, A., Fraile, L. M., Fynbo, H. O. U., Gottardo, A., Halverson, C., Harkness-Brennan, L. J., Heideman, J., Huyse, M., Illana, A., Janiak, Ł., Judson, D. S., Korgul, A., Kurtukian-Nieto, T., Lazarus, I., Lică, R., Lozeva, R., Marginean, N., Marginean, R., Mazzocchi, C., Mihai, C., Mihai, R. E., Morales, A. I., Page, R. D., Pakarinen, J., Piersa-Siłkowska, M., Podolyák, Zs., Sarriguren, P., Singh, M., Sotty, Ch., Stepaniuk, M., Tengblad, O., Turturica, A., Van Duppen, P., Vedia, V., Viñals, S., Warr, N., Yokoyama, R., and Yuan, C. X.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The $\beta$ decays from both the ground state and a long-lived isomer of $^{133}$In were studied at the ISOLDE Decay Station (IDS). With a hybrid detection system sensitive to $\beta$, $\gamma$, and neutron spectroscopy, the comparative partial half-lives (logft) have been measured for all their dominant $\beta$-decay channels for the first time, including a low-energy Gamow-Teller transition and several First-Forbidden (FF) transitions. Uniquely for such a heavy neutron-rich nucleus, their $\beta$ decays selectively populate only a few isolated neutron unbound states in $^{133}$Sn. Precise energy and branching-ratio measurements of those resonances allow us to benchmark $\beta$-decay theories at an unprecedented level in this region of the nuclear chart. The results show good agreement with the newly developed large-scale shell model (LSSM) calculations. The experimental findings establish an archetype for the $\beta$ decay of neutron-rich nuclei southeast of $^{132}$Sn and will serve as a guide for future theoretical development aiming to describe accurately the key $\beta$ decays in the rapid-neutron capture (r-) process.

Published
2023
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5. Beta-delayed neutron spectroscopy of $^{133}$In

Author

Xu, Z. Y., Madurga, M., Grzywacz, R., King, T. T., Algora, A., Andreyev, A. N., Benito, J., Berry, T., Borge, M. J. G., Costache, C., De Witte, H., Fijalkowska, A., Fraile, L. M., Fynbo, H. O. U., Gottardo, A., Halverson, C., Harkness-Brennan, L. J., Heideman, J., Huyse, M., Illana, A., Janiak, Ł., Judson, D. S., Korgul, A., Kurtukian-Nieto, T., Lazarus, I., Lică, R., Lozeva, R., Marginean, N., Marginean, R., Mazzocchi, C., Mihai, C., Mihai, R. E., Morales, A. I., Page, R. D., Pakarinen, J., Piersa-Siłkowska, M., Podolyák, Zs., Sarriguren, P., Singh, M., Sotty, Ch., Stepaniuk, M., Tengblad, O., Turturica, A., Van Duppen, P., Vedia, V., Viñals, S., Warr, N., Yokoyama, R., and Yuan, C. X.

Subjects
Nuclear Experiment
Abstract

The decay properties of $^{133}$In were studied in detail at the ISOLDE Decay Station (IDS). The implementation of the Resonance Ionization Laser Ion Source (RILIS) allowed separate measurements of its $9/2^+$ ground state ($^{133g}$In) and $1/2^-$ isomer ($^{133m}$In). With the use of $\beta$-delayed neutron and $\gamma$ spectroscopy, the decay strengths above the neutron separation energy were quantified in this neutron-rich nucleus for the first time. The allowed Gamow-Teller transition $9/2^+\rightarrow7/2^+$ was located at 5.92 MeV in the $^{133g}$In decay with a logft = 4.7(1). In addition, several neutron-unbound states were populated at lower excitation energies by the First-Forbidden decays of $^{133g,m}$In. We assigned spins and parities to those neutron-unbound states based on the $\beta$-decay selection rules, the logft values, and systematics.

Published
2023
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6. Microsecond Isomer at the N=20 Island of Shape Inversion Observed at FRIB

Author

Gray, T. J., Allmond, J. M., Xu, Z., King, T. T., Lubna, R. S., Crawford, H. L., Tripathi, V., Crider, B. P., Grzywacz, R., Liddick, S. N., Macchiavelli, A. O., Miyagi, T., Poves, A., Andalib, A., Argo, E., Benetti, C., Bhattacharya, S., Campbell, C. M., Carpenter, M. P., Chan, J., Chester, A., Christie, J., Clark, B. R., Cox, I., Doetsch, A. A., Dopfer, J., Duarte, J. G., Fallon, P., Frotscher, A., Gaballah, T., Harke, J. T., Heideman, J., Huegen, H., Holt, J. D., Jain, R., Kitamura, N., Kolos, K., Kondev, F. G., Laminack, A., Longfellow, B., Luitel, S., Madurga, M., Mahajan, R., Mogannam, M. J., Morse, C., Neupane, S., Nowicki, A., Ogunbeku, T. H., Ong, W. -J., Porzio, C., Prokop, C. J., Rasco, B. C., Ronning, E. K., Rubino, E., Ruland, T. J., Rykaczewski, K. P., Schaedig, L., Seweryniak, D., Siegl, K., Singh, M., Stuchbery, A. E., Tabor, S. L., Tang, T. L., Wheeler, T., Winger, J. A., and Wood, J. L.

Subjects
Nuclear Experiment
Abstract

Excited-state spectroscopy from the first Facility for Rare Isotope Beams (FRIB) experiment is reported. A 24(2)-$\mu$s isomer was observed with the FRIB Decay Station initiator (FDSi) through a cascade of 224- and 401-keV $\gamma$ rays in coincidence with $^{32}\textrm{Na}$ nuclei. This is the only known microsecond isomer ($1{\text{ }\mu\text{s}}\leq T_{1/2} < 1\text{ ms}$) in the region. This nucleus is at the heart of the $N=20$ island of shape inversion and is at the crossroads of spherical shell-model, deformed shell-model, and ab initio theories. It can be represented as the coupling of a proton hole and neutron particle to $^{32}\textrm{Mg}$, $^{32}\textrm{Mg}+\pi^{-1} + \nu^{+1}$. This odd-odd coupling and isomer formation provides a sensitive measure of the underlying shape degrees of freedom of $^{32}\textrm{Mg}$, where the onset of spherical-to-deformed shape inversion begins with a low-lying deformed $2^+$ state at 885 keV and a low-lying shape-coexisting $0_2^+$ state at 1058 keV. We suggest two possible explanations for the 625-keV isomer in $^{32}$Na: a $6^-$ spherical shape isomer that decays by $E2$ or a $0^+$ deformed spin isomer that decays by $M2$. The present results and calculations are most consistent with the latter, indicating that the low-lying states are dominated by deformation., Comment: 7 pages, 5 figures, accepted by Physical Review Letters

Published
2023
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7. CLARION2-TRINITY: a Compton-suppressed HPGe and GAGG:Ce-Si-Si array for absolute cross-section measurements with heavy ions

Author

Gray, T. J., Allmond, J. M., Dowling, D. T., Febbraro, M., King, T. T., Pain, S. D., Stracener, D. W., Ajayi, S., Aragon, J., Baby, L., Barber, P., Benetti, C., Bhattacharya, S., Boisseau, R., Gibbons, J., Tabor, S. L., Tripathi, V., Wibisono, C., Wiedenhoever, I., Bignell, L., Gerathy, M. S. M., Lane, G., McKie, L. J., Mitchell, A. J., Pope, J., Rietz, R. du, Stuchbery, A. E., Vaigneur, K., and Ruland, T. J.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The design and performance of a new Compton-suppressed HPGe and charged-particle array, CLARION2-TRINITY, are described. The TRINITY charged-particle array is comprised of 64 Cerium-doped Gadolinium Aluminium Gallium Garnet (GAGG:Ce) crystals configured into five rings spanning 7-54 degrees, and two annular silicon detectors that can shadow or extend the angular coverage to backward angles with minimal $\gamma$-ray attenuation. GAGG:Ce is a non-hygroscopic, bright, and relatively fast scintillator with a light distribution well matched to SiPMs. Count rates up to 40 kHz per crystal are sustainable. Fundamental characteristics of GAGG:Ce are measured and presented, including light- and heavy-ion particle identification (PID) capability, pulse-height defects, radiation hardness, and emission spectra. The CLARION2 array consists of up to 16 Compton-suppressed HPGe Clover detectors ($\approx4\%$ efficiency at 1 MeV) configured into four rings (eight HPGe crystal rings) using a non-Archimedean geometry that suppresses back-to-back coincident 511-keV gamma rays. The entire array is instrumented with 100- and 500-MHz (14 bit) waveform digitizers which enable triggerless operation, pulse-shape discrimination, fast timing, and pileup correction. Finally, two examples of experimental data taken during the commissioning of the CLARION2-TRINITY system are given: a PID spectrum from $^{16}$O + $^{18}$O fusion-evaporation, and PID and Doppler-corrected $\gamma$-ray spectra from $^{48}$Ti + $^{12}$C Coulomb excitation., Comment: 14 pages, 21 figures

Published
2022
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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. Development of the (d,n) proton-transfer reaction in inverse kinematics for structure studies

Author

Jones, K. L., Thornsberry, C., Allen, J., Atencio, A., Bardayan, D. W., Blankstein, D., Burcher, S., Carter, A. B., Chipps, K. A., Cizewski, J. A., Cox, I., Elledge, Z., Febbraro, M., Fijalkowska, A., Grzywacz, R., Hall, M. R., King, T. T., Lepailleur, A., Madurga, M., Marley, S. T., O'Malley, P. D., Paulauskas, S. V., Pain, S. D., Peters, W. A., Reingold, C., Smith, K., Taylor, S., Tan, W., Vostinar, M., and Walter, D.

Subjects
Nuclear Experiment
Abstract

Transfer reactions have provided exciting opportunities to study the structure of exotic nuclei and are often used to inform studies relating to nucleosynthesis and applications. In order to benefit from these reactions and their application to rare ion beams (RIBs) it is necessary to develop the tools and techniques to perform and analyze the data from reactions performed in inverse kinematics, that is with targets of light nuclei and heavier beams. We are continuing to expand the transfer reaction toolbox in preparation for the next generation of facilities, such as the Facility for Rare Ion Beams (FRIB), which is scheduled for completion in 2022. An important step in this process is to perform the (d,n) reaction in inverse kinematics, with analyses that include Q-value spectra and differential cross sections. In this way, proton-transfer reactions can be placed on the same level as the more commonly used neutron-transfer reactions, such as (d,p), (9Be,8Be), and (13C,12C). Here we present an overview of the techniques used in (d,p) and (d,n), and some recent data from (d,n) reactions in inverse kinematics using stable beams of 12C and 16O., Comment: 9 pages, 4 figures, presented at the XXXV Mazurian Lakes Conference on Physics, Piaski, Poland

Published
2017
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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. 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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12. Study of decay properties of Ba to Nd nuclei (A~160) relevant to the formation of the r-process rare-earth peak

Author

Pallàs M., Tarifeño-Saldivia A., Kiss G. G., Tain J. L., Tolosa-Delgado A., Vitéz-Sveiczer A., Calviño F., Agramunt J., Aguilera P., Algora A., Allmond J. M., Baba H., Brewer N. T., Caballero-Folch R., Coleman-Smith P. J., Cortes G., Davinson T., Dillmann I., Domingo-Pardo C., Estrade A., Fukuda N., Go S., Griffin C. J., Grzywacz R. K., Hall O., Harkness-Brennan L. J., Isobe T., Kahl D., King T. T., Korgul A., Kovács S., Kubono S., Labiche M., Liu J., Madurga M., Miernik K., Molina F., Mont-Geli N., Morales A. I., Nácher E., Navarro A., Nepal N., Nishimura S., Piersa-Silkowska M., Phong V., Rasco B. C., Romero-Barrientos J., Rubio B., Rykaczewski K. P., Saito Y., Sakurai H., Shimizu Y., Singh M., Sumikama T., Suzuki H., Szegedi T. N., Takeda H., Wang K., Wolińska-Cichocka M., Woods P. J., and Yokoyama R.

Subjects
Physics, QC1-999
Abstract

Half-lifes (T1/2) of exotic neutron-rich isotopes of Ba, La, Ce, Pr, and Nd were measured at the RIKEN Nishina Center. The experimental setup consisted of the BigRIPS in-flight separator for ion selection identification, the Advance Implantation Detector Array (AIDA) for ions and β detection, and the BRIKEN detector for neutron counting. Using this setup, 4 new T1/2 have been measured for the first time, and 38 T1/2 have been remeasured with improved precision in several cases. These new experimental data should help to constrain theoretical models for calculations of T1/2. The status of the experimental analysis and preliminary results are provided in this contribution.

Published
2023
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13. Study of decay properties for Ba to Nd nuclei relevant for the formation of the r-process rare-earth peak (A∼160)

Author

Pallàs M., Tarifeño-Saldivia A., Kiss G. G., Tain J. L., Tolosa-Delgado A., Vitéz-Sveiczer A., Calviño F., Agramunt J., Aguilera P., Algora A., Allmond J. M., Baba H., Brewer N. T., Caballero-Folch R., Coleman-Smith P. J., Cortes G., Davinson T., Dillmann I., Domingo-Pardo C., Estrade A., Fukuda N., Go S., Griffin C. J., Grzywacz R. K., Hall O., Harkness-Brennan L. J., Isobe T., Kahl D., King T. T., Korgul A., Kovács S., Kubono S., Labiche M., Liu J., Madurga M., Miernik K., Molina F., Mont-Geli N., Morales A. I., Nácher E., Navarro A., Nepal N., Nishimura S., Piersa-Silkowska M., Phong V., Rasco B. C., Romero-Barrientos J., Rubio B., Rykaczewski K. P., Saito Y., Sakurai H., Shimizu Y., Singh M., Sumikama T., Suzuki H., Szegedi T. N., Takeda H., Wang K., Wolińska-Cichocka M., Woods P. J., and Yokoyama R.

Subjects
Physics, QC1-999
Abstract

At the RIKEN Nishina Center, exotic neutron-rich isotopes of Ba, La, Ce, Pr, and Nd were measured. This work reports their half-lives (T1/2) and β-delayed neutron-emission probabilities (Pxn). The setup consisted of the BigRIPS in-flight separator for particle identification, the Advanced Implantation Detector Array (AIDA) for ions and β detection, and the BRIKEN neutron counter for neutron detection. Using this arrangement, 4 new T1/2 and 14 new P1n were measured. Furthermore, 38 T1/2 and 2 P1n values were remeasured, decreasing the uncertainties for some of them. In addition to improving predictions of nucleosynthesis models that describe the production of the rare-earth peak at A ∼ 160 via the r-process, these additional experimental data should help to constrain theoretical models for calculations of T1/2 and Pxn in this region.

Published
2023
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14. β decay of Mg36 and Al36 : Identification of a β -decaying isomer in Al36

Author

Lubna, R. S., primary, Liddick, S. N., additional, Ogunbeku, T. H., additional, Chester, A., additional, Allmond, J. M., additional, Bhattacharya, Soumik, additional, Campbell, C. M., additional, Carpenter, M. P., additional, Childers, K. L., additional, Chowdhury, P., additional, Christie, J., additional, Clark, B. R., additional, Clark, R. M., additional, Cox, I., additional, Crawford, H. L., additional, Crider, B. P., additional, Doetsch, A. A., additional, Fallon, P., additional, Frotscher, A., additional, Gaballah, T., additional, Gray, T. J., additional, Grzywacz, R., additional, Harke, J. T., additional, Hartley, A. C., additional, Jain, R., additional, King, T. T., additional, Kitamura, N., additional, Kolos, K., additional, Kondev, F. G., additional, Lamere, E., additional, Lewis, R., additional, Longfellow, B., additional, Lyons, S., additional, Luitel, S., additional, Madurga, M., additional, Mahajan, R., additional, Mogannam, M. J., additional, Morse, C., additional, Neupane, S. K., additional, Ong, W.-J., additional, Perez-Loureiro, D., additional, Porzio, C., additional, Prokop, C. J., additional, Richard, A. L., additional, Ronning, E. K., additional, Rubino, E., additional, Rykaczewski, K., additional, Seweryniak, D., additional, Siegl, K., additional, Silwal, U., additional, Singh, M., additional, Siwakoti, D. P., additional, Smith, D. C., additional, Smith, M. K., additional, Tabor, S. L., additional, Tang, T. L., additional, Tripathi, Vandana, additional, Volya, A., additional, Wheeler, T., additional, Xiao, Y., additional, and Xu, Z., additional

Published
2023
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15. β -delayed neutron spectroscopy of In133

Author

Xu, Z. Y., primary, Madurga, M., additional, Grzywacz, R., additional, King, T. T., additional, Algora, A., additional, Andreyev, A. N., additional, Benito, J., additional, Berry, T., additional, Borge, M. J. G., additional, Costache, C., additional, De Witte, H., additional, Fijalkowska, A., additional, Fraile, L. M., additional, Fynbo, H. O. U., additional, Gottardo, A., additional, Halverson, C., additional, Harkness-Brennan, L. J., additional, Heideman, J., additional, Huyse, M., additional, Illana, A., additional, Janiak, Ł., additional, Judson, D. S., additional, Korgul, A., additional, Kurtukian-Nieto, T., additional, Lazarus, I., additional, Lică, R., additional, Lozeva, R., additional, Marginean, N., additional, Marginean, R., additional, Mazzocchi, C., additional, Mihai, C., additional, Mihai, R. E., additional, Morales, A. I., additional, Page, R. D., additional, Pakarinen, J., additional, Piersa-Siłkowska, M., additional, Podolyák, Zs., additional, Sarriguren, P., additional, Singh, M., additional, Sotty, Ch., additional, Stepaniuk, M., additional, Tengblad, O., additional, Turturica, A., additional, Van Duppen, P., additional, Vedia, V., additional, Viñals, S., additional, Warr, N., additional, Yokoyama, R., additional, and Yuan, C. X., additional

Published
2023
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16. In133 : A Rosetta Stone for Decays of r -Process Nuclei

Author

Xu, Z. Y., primary, Madurga, M., additional, Grzywacz, R., additional, King, T. T., additional, Algora, A., additional, Andreyev, A. N., additional, Benito, J., additional, Berry, T., additional, Borge, M. J. G., additional, Costache, C., additional, De Witte, H., additional, Fijalkowska, A., additional, Fraile, L. M., additional, Fynbo, H. O. U., additional, Gottardo, A., additional, Halverson, C., additional, Harkness-Brennan, L. J., additional, Heideman, J., additional, Huyse, M., additional, Illana, A., additional, Janiak, Ł., additional, Judson, D. S., additional, Korgul, A., additional, Kurtukian-Nieto, T., additional, Lazarus, I., additional, Lică, R., additional, Lozeva, R., additional, Marginean, N., additional, Marginean, R., additional, Mazzocchi, C., additional, Mihai, C., additional, Mihai, R. E., additional, Morales, A. I., additional, Page, R. D., additional, Pakarinen, J., additional, Piersa-Siłkowska, M., additional, Podolyák, Zs., additional, Sarriguren, P., additional, Singh, M., additional, Sotty, Ch., additional, Stepaniuk, M., additional, Tengblad, O., additional, Turturica, A., additional, Van Duppen, P., additional, Vedia, V., additional, Viñals, S., additional, Warr, N., additional, Yokoyama, R., additional, and Yuan, C. X., additional

Published
2023
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17. Microsecond Isomer at the N=20 Island of Shape Inversion Observed at FRIB

Author

Gray, T. J., primary, Allmond, J. M., additional, Xu, Z., additional, King, T. T., additional, Lubna, R. S., additional, Crawford, H. L., additional, Tripathi, V., additional, Crider, B. P., additional, Grzywacz, R., additional, Liddick, S. N., additional, Macchiavelli, A. O., additional, Miyagi, T., additional, Poves, A., additional, Andalib, A., additional, Argo, E., additional, Benetti, C., additional, Bhattacharya, S., additional, Campbell, C. M., additional, Carpenter, M. P., additional, Chan, J., additional, Chester, A., additional, Christie, J., additional, Clark, B. R., additional, Cox, I., additional, Doetsch, A. A., additional, Dopfer, J., additional, Duarte, J. G., additional, Fallon, P., additional, Frotscher, A., additional, Gaballah, T., additional, Harke, J. T., additional, Heideman, J., additional, Huegen, H., additional, Holt, J. D., additional, Jain, R., additional, Kitamura, N., additional, Kolos, K., additional, Kondev, F. G., additional, Laminack, A., additional, Longfellow, B., additional, Luitel, S., additional, Madurga, M., additional, Mahajan, R., additional, Mogannam, M. J., additional, Morse, C., additional, Neupane, S., additional, Nowicki, A., additional, Ogunbeku, T. H., additional, Ong, W.-J., additional, Porzio, C., additional, Prokop, C. J., additional, Rasco, B. C., additional, Ronning, E. K., additional, Rubino, E., additional, Ruland, T. J., additional, Rykaczewski, K. P., additional, Schaedig, L., additional, Seweryniak, D., additional, Siegl, K., additional, Singh, M., additional, Stuchbery, A. E., additional, Tabor, S. L., additional, Tang, T. L., additional, Wheeler, T., additional, Winger, J. A., additional, and Wood, J. L., additional

Published
2023
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18. 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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19. New isotope Mc286 produced in the Am243+Ca48 reaction

Author

Oganessian, Yu. Ts., primary, Utyonkov, V. K., additional, Kovrizhnykh, N. D., additional, Abdullin, F. Sh., additional, Dmitriev, S. N., additional, Dzhioev, A. A., additional, Ibadullayev, D., additional, Itkis, M. G., additional, Karpov, A. V., additional, Kuznetsov, D. A., additional, Petrushkin, O. V., additional, Podshibiakin, A. V., additional, Polyakov, A. N., additional, Popeko, A. G., additional, Rogov, I. S., additional, Sagaidak, R. N., additional, Schlattauer, L., additional, Shubin, V. D., additional, Shumeiko, M. V., additional, Solovyev, D. I., additional, Tsyganov, Yu. S., additional, Voinov, A. A., additional, Subbotin, V. G., additional, Bodrov, A. Yu., additional, Sabel'nikov, A. V., additional, Khalkin, A. V., additional, Rykaczewski, K. P., additional, King, T. T., additional, Roberto, J. B., additional, Brewer, N. T., additional, Grzywacz, R. K., additional, Gan, Z. G., additional, Zhang, Z. Y., additional, Huang, M. H., additional, and Yang, H. B., additional

Published
2022
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20. Crossing N=28 Toward the Neutron Drip Line: First Measurement of Half-Lives at FRIB

Author

Crawford, H. L., primary, Tripathi, V., additional, Allmond, J. M., additional, Crider, B. P., additional, Grzywacz, R., additional, Liddick, S. N., additional, Andalib, A., additional, Argo, E., additional, Benetti, C., additional, Bhattacharya, S., additional, Campbell, C. M., additional, Carpenter, M. P., additional, Chan, J., additional, Chester, A., additional, Christie, J., additional, Clark, B. R., additional, Cox, I., additional, Doetsch, A. A., additional, Dopfer, J., additional, Duarte, J. G., additional, Fallon, P., additional, Frotscher, A., additional, Gaballah, T., additional, Gray, T. J., additional, Harke, J. T., additional, Heideman, J., additional, Heugen, H., additional, Jain, R., additional, King, T. T., additional, Kitamura, N., additional, Kolos, K., additional, Kondev, F. G., additional, Laminack, A., additional, Longfellow, B., additional, Lubna, R. S., additional, Luitel, S., additional, Madurga, M., additional, Mahajan, R., additional, Mogannam, M. J., additional, Morse, C., additional, Neupane, S., additional, Nowicki, A., additional, Ogunbeku, T. H., additional, Ong, W.-J., additional, Porzio, C., additional, Prokop, C. J., additional, Rasco, B. C., additional, Ronning, E. K., additional, Rubino, E., additional, Ruland, T. J., additional, Rykaczewski, K. P., additional, Schaedig, L., additional, Seweryniak, D., additional, Siegl, K., additional, Singh, M., additional, Tabor, S. L., additional, Tang, T. L., additional, Wheeler, T., additional, Winger, J. A., additional, and Xu, Z., additional

Published
2022
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21. 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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22. First experiment at the Super Heavy Element Factory: High cross section of Mc288 in the Am243+Ca48 reaction and identification of the new isotope Lr264

Author

Oganessian, Yu. Ts., primary, Utyonkov, V. K., additional, Kovrizhnykh, N. D., additional, Abdullin, F. Sh., additional, Dmitriev, S. N., additional, Ibadullayev, D., additional, Itkis, M. G., additional, Kuznetsov, D. A., additional, Petrushkin, O. V., additional, Podshibiakin, A. V., additional, Polyakov, A. N., additional, Popeko, A. G., additional, Sagaidak, R. N., additional, Schlattauer, L., additional, Shirokovski, I. V., additional, Shubin, V. D., additional, Shumeiko, M. V., additional, Solovyev, D. I., additional, Tsyganov, Yu. S., additional, Voinov, A. A., additional, Subbotin, V. G., additional, Bodrov, A. Yu., additional, Sabel'nikov, A. V., additional, Khalkin, A. V., additional, Zlokazov, V. B., additional, Rykaczewski, K. P., additional, King, T. T., additional, Roberto, J. B., additional, Brewer, N. T., additional, Grzywacz, R. K., additional, Gan, Z. G., additional, Zhang, Z. Y., additional, Huang, M. H., additional, and Yang, H. B., additional

Published
2022
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23. Measuring the β-decay Properties of Neutron-rich Exotic Pm, Sm, Eu, and Gd Isotopes to Constrain the Nucleosynthesis Yields in the Rare-earth Region

Author

Kiss, G. G., primary, Vitéz-Sveiczer, A., additional, Saito, Y., additional, Tarifeño-Saldivia, A., additional, Pallas, M., additional, Tain, J. L., additional, Dillmann, I., additional, Agramunt, J., additional, Algora, A., additional, Domingo-Pardo, C., additional, Estrade, A., additional, Appleton, C., additional, Allmond, J. M., additional, Aguilera, P., additional, Baba, H., additional, Brewer, N. T., additional, Bruno, C., additional, Caballero-Folch, R., additional, Calvino, F., additional, Coleman-Smith, P. J., additional, Cortes, G., additional, Davinson, T., additional, Fukuda, N., additional, Ge, Z., additional, Go, S., additional, Griffin, C. J., additional, Grzywacz, R. K., additional, Hall, O., additional, Horváth, A., additional, Ha, J., additional, Harkness-Brennan, L. J., additional, Isobe, T., additional, Kahl, D., additional, King, T. T., additional, Korgul, A., additional, Kovács, S., additional, Krücken, R., additional, Kubono, S., additional, Labiche, M., additional, Liu, J., additional, Liang, J., additional, Madurga, M., additional, Miernik, K., additional, Molina, F., additional, Morales, A. I., additional, Mumpower, M. R., additional, Nacher, E., additional, Navarro, A., additional, Nepal, N., additional, Nishimura, S., additional, Piersa-Siłkowska, M., additional, Phong, V., additional, Rasco, B. C., additional, Rubio, B., additional, Rykaczewski, K. P., additional, Romero-Barrientos, J., additional, Sakurai, H., additional, Sexton, L., additional, Shimizu, Y., additional, Singh, M., additional, Sprouse, T., additional, Sumikama, T., additional, Surman, R., additional, Suzuki, H., additional, Szegedi, T. N., additional, Takeda, H., additional, Tolosa, A., additional, Wang, K., additional, Wolinska-Cichocka, M., additional, Woods, P., additional, Yokoyama, R., additional, and Xu, Z., additional

Published
2022
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24. Investigation of Ca48 -induced reactions with Pu242 and U238 targets at the JINR Superheavy Element Factory

Author

Oganessian, Yu. Ts., primary, Utyonkov, V. K., additional, Ibadullayev, D., additional, Abdullin, F. Sh., additional, Dmitriev, S. N., additional, Itkis, M. G., additional, Karpov, A. V., additional, Kovrizhnykh, N. D., additional, Kuznetsov, D. A., additional, Petrushkin, O. V., additional, Podshibiakin, A. V., additional, Polyakov, A. N., additional, Popeko, A. G., additional, Sagaidak, R. N., additional, Schlattauer, L., additional, Shubin, V. D., additional, Shumeiko, M. V., additional, Solovyev, D. I., additional, Tsyganov, Yu. S., additional, Voinov, A. A., additional, Subbotin, V. G., additional, Bodrov, A. Yu., additional, Sabel'nikov, A. V., additional, Lindner, A., additional, Rykaczewski, K. P., additional, King, T. T., additional, Roberto, J. B., additional, Brewer, N. T., additional, Grzywacz, R. K., additional, Gan, Z. G., additional, Zhang, Z. Y., additional, Huang, M. H., additional, and Yang, H. B., additional

Published
2022
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26. 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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27. 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

28. Calibration of the Neutral Mass Spectrometer for the Lunar Atmosphere and Dust Environment Explorer

Author

Mahaffy, P. R, Hodges, R. R, Harpold, D. N, King, T. T, Jaeger, F, Raaen, E, Lyness, E, Collier, M, and Benna, M

Subjects
Instrumentation And Photography
Abstract

Science objectives of the LADEE Mission are to (1) determine the composition, and time variability of the tenuous lunar atmosphere and (2) to characterize the dust environment and its variability. These studies will extend the in-situ characterization of the environment that were carried out decades ago with the Apollo missions and a variety of ground based studies. The focused LADEE measurements will enable a more complete understanding of dust and gas sources and sinks. Sources of gas include UV photo-stimulated desorption, sputtering by plasma and micrometeorites, as well as thermal release of species such as argon from the cold service or venting from the lunar interior. Sinks include recondensation on the surface and escape through a variety of mechanisms. The LADEE science payload consists of an Ultraviolet Spectrometer, a Neutral Mass Spectrometer, and a Dust Detector. The LADEE orbit will include multiple passes at or below 50 km altitude and will target repeated sampling at the sunrise terminator where exospheric density will be highest for some thermally released species. The science mission will be implemented in approximately three months to allow measurements to be made over a period of one or more lunations In addition to the science mission NASA will use this mission to demonstrate optical communication technology away from low Earth orbit.

Published
2012

29. 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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30. Cryogenic Characterization and Testing of Magnetically-Actuated Microshutter Arrays for the James Webb Space Telescope

Author

King, T. T, Kletetschka, G, Jah, M. A, Li, M. J, Jhabvala, M. D, Wang, L. L, Beamesderfer, M. A, Kutyrev, A. S, Silverberg, R. F, Rapchun, D, and Schwinger, D. S

Subjects
Electronics And Electrical Engineering
Abstract

Two-dimensional MEMS microshutter arrays (MSA) have been fabricated at the NASA Goddard Space Flight Center (GSFC) for the James Webb Space Telescope (JWST) to enable cryogenic (approximately 35 K) spectrographic astronomy measurements in the near-infrared region. Functioning as a focal plane object selection device, the MSA is a 2-D programmable aperture mask with fine resolution, high efficiency and high contrast. The MSA are close- packed silicon nitride shutters (cell size of 100 x 200 microns) patterned with a torsion flexure to allow opening to 90 degrees. A layer of magnetic material is deposited onto each shutter to permit magnetic actuation. Two electrodes are deposited, one onto each shutter and another onto the support structure side-wall, permitting electrostatic latching and 2-D addressing. New techniques were developed to test MSA under mission-similar conditions (8 K less than or equal to T less than 300K). The magnetic rotisserie has proven to be an excellent tool for rapid characterization of MSA. Tests conducted with the magnetic rotisserie method include accelerated cryogenic lifetesting of unpackaged 128 x 64 MSA and parallel measurement of the magneto-mechanical stiffness of shutters in pathfinder test samples containing multiple MSA designs. Lifetest results indicate a logarithmic failure rate out to approximately 10(exp 6) shutter actuations. These results have increased our understanding of failure mechanisms and provide a means to predict the overall reliability of MSA devices.

Published
2004

31. Rare-Earth Garnets and Perovskites for Space-Based ADR Cooling at High T and Low H

Author

King, T. T, Rowlett, B. A, Ramirez, R. A, Shirron, P. J, Canavan, E. R, DiPirro, M. J, Panek, J. S, Tuttle, J. G, Shull, R. D, Fry, R. A, and Brodeur, Stephen J

Subjects
Instrumentation And Photography
Abstract

Future NASA satellite detector systems must be cooled to the 0.1 K temperature range to meet the stringent energy resolution and sensitivity requirements demanded by mid-term astronomy missions. The development of adiabatic demagnetization refrigeration (ADR) materials that can efficiently cool from the passive radiative cooling limit of approx. 30 K down to sub-Kelvin under low magnetic fields (H less than or equal to 3 T) would represent a significant improvement in space-based cooling technology. Governed by these engineering goals, our efforts have focused on quantifying the change in magnetic entropy of rare-earth garnets and perovskites. Various compositions within the gadolinium gallium iron garnet solid solution series (GGIG, Gd3Ga(5-x)Fe(x)O12, 0.00 less than or equal to X less than or equal to 5.00) and gadolinium aluminum perovskite (GAP, GdAlO3) have been synthesized via an organometallic complex approach and confirmed with powder x-ray diffraction. The magnetization of the GGIG and GAP materials has been measured as a function of composition (0.00 less than or equal to X less than or equal to 5.00), temperature (2 K less than or equal to T less than or equal to 30 K) and applied magnetic field (0 T less than or equal to H less than or equal to 3 T). The magnetic entropy change (DeltaS(sub mag)) between 0 T and 3 T was determined from the magnetization data. In the GGIG system, DeltaS(sub mag) was compositionally dependent; Fe(sup 3+) additions up to X less than or equal to 2.44 increased DeltaS(sub mag) at T > 5 K. For GAP, DeltaS(sub mag) was similar to that of GGIG, X = 0.00, both in terms of magnitude and temperature dependence at T > 10 K. However, the DeltaS(sub mag) of GAP at T < 10 K was less than the endmember GGIG composition, X = 0.00, and exhibited maximum approx. 5 K.

Published
2001

32. Strong one-neutron emission from two-neutron unbound states in β decays of the r -process nuclei Ga86,87

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, 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, Surman, R., 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
2019
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43. Cryogenic characterization and testing of magnetically-actuated microshutter arrays for the James Webb Space Telescope

Author

King, T T, primary, Kletetschka, G, additional, Jah, M A, additional, Beamesderfer, M A, additional, Li, M J, additional, Wang, L L, additional, Moseley, S H, additional, Sparr, L M, additional, Jhabvala, M D, additional, Kutyrev, A S, additional, Silverberg, R F, additional, Rapchun, D, additional, Zheng, Y, additional, Schwinger, D S, additional, and Voellmer, G M, additional

Published
2005
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44. Rare-earth garnets and perovskites for space-based ADR cooling at high T and low H.

Author

King, T. T., Rowlett, B. A., Ramirez, R. A., Shirron, P. J., Canavan, E. R., DiPirro, M. J., Panek, J. S., Tuttle, J. G., Shull, R. D., and Fry, R. A.

Subjects
*REFRIGERATION & refrigerating machinery, *SPACE vehicles
Abstract

Future NASA satellite detector systems must be cooled to the 0.1 K temperature range to meet the stringent energy resolution and sensitivity requirements demanded by mid-term astronomy missions. The development of adiabatic demagnetization refrigeration (ADR) materials that can efficiently cool from the passive radiative cooling limit of ∼30 K down to sub-Kelvin under low magnetic fields (H ≤ 3 T) would represent a significant improvement in space-based cooling technology. Governed by these engineering goals, our efforts have focused on quantifying the change in magnetic entropy of rare-earth garnets and perovskites. Various compositions within the gadolinium gallium iron garnet solid solution series (GGIG, Gd[sub 3]Ga[sub 5-X]Fe[sub X]O[sub 12], 0.00 ≤ X ≤ 5.00) and gadolinium aluminum perovskite (GAP, GdAlO[sub 3]) have been synthesized via an organometallic complex approach and confirmed with powder x-ray diffraction. The magnetization of the GGIG and GAP materials has been measured as a function of composition (0.00 ≤ X ≤ 5.00), temperature (2 K ≤ T ≤ 30 K) and applied magnetic field (0 T ≤ H ≤ 3 T). The magnetic entropy change (ΔS[sub mag]) between 0 T and 3 T was determined from the magnetization data. In the GGIG system, ΔS[sub mag] was compositionally dependent; Fe[sub 3+] additions up to X ≤ 2.44 increased ΔS[sub mag] at T > 5 K. For GAP, ΔS[sub mag] was similar to that of GGIG, X = 0.00, both in terms of magnitude and temperature dependence at T > 10 K. However, the ΔS[sub mag] of GAP at T < 10 K was less than the endmember GGIG composition, X = 0.00, and exhibited maximum ∼5 K. [ABSTRACT FROM AUTHOR]

Published
2002

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