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69 results on '"PHONG, V. H."'

1. YSO implantation detector for beta-delayed neutron spectroscopy

Author

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

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

A segmented-scintillator-based implantation detector was developed to study the energy distribution of beta-delayed neutrons emitted from exotic isotopes. The detector comprises a 34 $\times$ 34 YSO scintillator coupled to an 8 $\times$ 8 Position-Sensitive Photo-Multiplier Tube (PSPMT) via a tapered light guide. The detector was used at RIBF, RIKEN, for time-of-flight-based neutron spectroscopy measurement in the $^{78}$Ni region. The detector provides the position and timing resolution necessary for ion-beta correlations and ToF measurements. The detector provides a high $\sim$ 80 $\%$ beta-detection efficiency and a sub-nanosecond timing resolution. This contribution discusses the details of the design, operation, implementation, and analysis developed to obtain neutron time-of-flight spectrum and the analysis methods in the context of neutron-rich nuclei in the $^{78}$Ni region.

Published
2024

2. Isospin breaking in the $^{71}$Kr and $^{71}$Br mirror system

Author

Algora, A., Vitéz-Sveiczer, A., Poves, A., Kiss, G. G., Rubio, B., de Angelis, G., Recchia, F., Nishimura, S., Rodriguez, T., Sarriguren, P., Agramunt, J., Guadilla, V., Montaner-Pizá, A., Morales, A. I., Orrigo, S. E. A., Napoli, D., Lenzi, S. M., Boso, A., Phong, V. H., Wu, J., Söderström, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D. S., Baba, H., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Chen, S., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grévy, S., Nieto, T. Kurtukián, Magron, C., Gelletly, W., Dombrádi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., Schaffner, H., and Kruppa, A.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Isospin symmetry is a fundamental concept in nuclear physics. Even though isospin symmetry is partially broken, it holds approximately for most nuclear systems, which makes exceptions very interesting from the nuclear structure perspective. In this framework, it is expected that the spins and parities of the ground states of mirror nuclei should be the same, in particular for the simplest systems where a proton is exchanged with a neutron or vice versa. In this work, we present evidence that this assumption is broken in the mirror pair $^{71}$Br and $^{71}$Kr system. Our conclusions are based on a high-statistics $\beta$ decay study of $^{71}$Kr and on state-of-the-art shell model calculations. In our work, we also found evidence of a new state in $^{70}$Se, populated in the $\beta$-delayed proton emission process which can be interpreted as the long sought coexisting 0$^+$ state., Comment: 8 pages with references, 3 figures. Supplemental material 4 pages (1 table, 3 figures)

Published
2024

3. First Exploration of Monopole-Driven Shell Evolution above the N = 126 shell closure: new Millisecond Isomers in 213Tl and 215Tl

Author

Yeung, T. T., Morales, A. I., Wu, J., Liu, M., Yuan, C., Nishimura, S., Phong, V. H., Fukuda, N., Tain, J. L., Davinson, T., Rykaczewski, K. P., Yokoyama, R., Isobe, T., Niikura, M., Podolyak, Zs., Alcala, G., Algora, A., Agramunt, J., Appleton, C., Baba, H., Caballero-Folch, R., Calvino, P., Carpenter, M. P., Dillmann, I., Estrade, A., Gao, T., Griffin, C., Grzywacz, R., Hall, O., Hirayama, Y., Hue, B. M., Ideguchi, E., Kiss, G. G., Kokubun, K., Kondev, F. G., Mizuno, R., Mukai, M., Nepal, N., Nurhafiza, M. N., Ohta, S., Orrigo, S. E. A., Pallas, M., Park, J., Rodriguez-Garcia, D., Sakurai, H., Sexton, L., Shimizu, Y., Suzuki, H., Sveiczer, A., Takeda, H., Tarifeno-Saldivia, A., Tolosa-Delgado, A., Victoria, J. A., Watanabe, Y. X., and Yap, J. M.

Subjects
Nuclear Experiment
Abstract

Isomer spectroscopy of heavy neutron-rich nuclei beyond the N=126 closed shell has been performed for the first time at the Radioactive Isotope Beam Factory of the RIKEN Nishina Center. New millisecond isomers have been identified at low excitation energies, 985.3(19) keV in 213Tl and 874(5) keV in 215Tl. The measured half-lives of 1.34(5) ms in 213Tl and 3.0(3) ms in 215Tl suggest spins and parities 11/2- with the single proton-hole configuration h11/2 as leading component. They are populated via E1 transitions by the decay of higher-lying isomeric states with proposed spin and parity 17/2+, interpreted as arising from a single s1/2 proton hole coupled to the 8+ seniority isomer in the (A+1)Pb cores. The lowering of the 11/2- states is ascribed to an increase of the h11/2 proton effective single-particle energy as the second g9/2 orbital is filled by neutrons, owing to a significant reduction of the proton-neutron monopole interaction between the h11/2 and g9/2 orbitals. The new ms-isomers provide the first experimental observation of shell evolution in the almost unexplored N>126 nuclear region below doubly-magic 208Pb., Comment: 9 pages, 3 figures, 1 table

Published
2024

4. Shape coexistence revealed in the $N=Z$ isotope $^{72}$Kr through inelastic scattering

Author

Wimmer, K., Arici, T., Korten, W., Doornenbal, P., Delaroche, J. -P., Girod, M., Libert, J., Rodríguez, T. R., Aguilera, P., Algora, A., Ando, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., de Angelis, G., de France, G., Doherty, D. T., Gerl, J., Gernhäuser, R., Goigoux, T., Jenkins, D., Kiss, G., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Nishimura, S., Obertelli, A., Lubos, D., Phong, V. H., Rubio, B., Sahin, E., Saito, T. Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Vaquero, V., Wadsworth, R., Wu, J., and Zielinska, M.

Subjects
Nuclear Experiment
Abstract

The $N=Z=36$ nucleus $^{72}$Kr has been studied by inelastic scattering at intermediate energies. Two targets, $^{9}$Be and $^{197}$Au, were used to extract the nuclear deformation length, $\delta_\text{N}$, and the reduced $E2$ transition probability, $B(E2)$. The previously unknown non-yrast $2^+$ and $4^+$ states as well as a new candidate for the octupole $3^-$ state have been observed in the scattering on the Be target and placed in the level scheme based on $\gamma-\gamma$ coincidences. The second $2^+$ state was also observed in the scattering on the Au target and the $B(E2;\;2^+_2 \rightarrow 0^+_1)$ value could be determined for the first time. Analyzing the results in terms of a two-band mixing model shows clear evidence for a oblate-prolate shape coexistence and can be explained by a shape change from an oblate ground state to prolate deformed yrast band from the first $2^+$ state. This interpretation is corroborated by beyond mean field calculations using the Gogny D1S interaction., Comment: 12 pages, 11 figures, accepted European Physical Journal A

Published
2020
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5. 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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6. Commissioning of the BRIKEN detector for the measurement of very exotic beta-delayed neutron emitters

Author

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

Subjects
Physics - Instrumentation and Detectors
Abstract

A new detection system has been installed at the RIKEN Nishina Center (Japan) to investigate decay properties of very neutron-rich nuclei. The setup consists of three main parts: a moderated neutron counter, a detection system sensitive to the implantation and decay of radioactive ions, and gamma-ray detectors. We describe here the setup, the commissioning experiment and some selected results demonstrating its performance for the measurement of half-lives and beta-delayed neutron emission probabilities. The methodology followed in the analysis of the data is described in detail. Particular emphasis is placed on the correction of the accidental neutron background.

Published
2018
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7. The ORNL Analysis Technique for Extracting $\beta$-Delayed Multi-Neutron Branching Ratios with BRIKEN

Author

Rasco, B. C., Brewer, N. T., Yokoyama, R., Grzywacz, R., Rykaczewski, K. P., Tolosa-Delgado, A., Agramunt, J., Tain, J. L., Algora, A., Hall, O., Griffin, C., Davinson, T., Phong, V. H., Liu, J., Nishimura, S., Kiss, G. G., Nepal, N., and Estrade, A.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

Many choices are available in order to evaluate large radioactive decay networks. %multi-particle decay data. There are many parameters that influence the calculated $\beta$-decay delayed single and multi-neutron emission branching fractions. We describe assumptions about the decay model, background, and other parameters and their influence on $\beta$-decay delayed multi-neutron emission analysis. An analysis technique, the ORNL BRIKEN analysis procedure, for determining $\beta$-delayed multi-neutron branching ratios in $\beta$-neutron precursors produced by means of heavy-ion fragmentation is presented. The technique is based on estimating the initial activities of zero, one, and two neutrons occurring in coincidence with an ion-implant and $\beta$ trigger. The technique allows one to extract $\beta$-delayed multi-neutron decay branching ratios measured with the hybrid \textsuperscript{3}He BRIKEN neutron counter. As an example, two analyses of the $\beta$-neutron emitter \textsuperscript{77}Cu based on different {\it a priori} assumptions are presented along with comparisons to literature values., Comment: 21 pages, 10 figures

Published
2018
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8. Simultaneous investigation of the $\mathbf{T=1~ (J^{\pi}=0^+)}$ and $\mathbf{T=0 ~ (J^{\pi}=9^+)}$ $\beta$ decays in $^{70}$Br

Author

Morales, A. I., Algora, A., Rubio, B., Kaneko, K., Nishimura, S., Aguilera, P., Orrigo, S. E. A., Molina, F., de Angelis, G., Recchia, F., Kiss, G., Phong, V. H., Wu, J., Nishimura, D., Oikawa, H., Goigoux, T., Giovinazzo, J., Ascher, P., Agramunt, J., Ahn, D. S., Baba, H., Blank, B., Borcea, C., Boso, A., Davies, P., Diel, F., Dombrádi, Zs., Doornenbal, P., Eberth, J., de France, G., Fujita, Y., Fukuda, N., Ganioglu, E., Gelletly, W., Gerbaux, M., Grévy, S., Guadilla, V., Inabe, N., Isobe, T., Korten, W., Kubo, T., Kubono, S., Nieto, T. Kurtukián, Lenzi, S., Lubos, D., Magron, C., Montaner-Pizá, A., Napoli, D. R., Sakurai, H., Shimizu, Y., Sidong, C., Söderström, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., and Yagi, S.

Subjects
Nuclear Experiment
Abstract

The $\beta$ decay of the odd-odd nucleus $^{70}$Br has been investigated with the BigRIPS and EURICA setups at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center. The $T=0$ ($J^{\pi}=9^+$) and $T=1$ ($J^{\pi}=0^+$) isomers have both been produced in in-flight fragmentation of $^{78}$Kr with ratios of 41.6(8)\% and 58.4(8)\%, respectively. A half-life of $t_{1/2}=2157^{+53}_{-49}$ ms has been measured for the $J^{\pi}=9^+$ isomer from $\gamma$-ray time decay analysis. Based on this result, we provide a new value of the half-life for the $J^{\pi}=0^+$ ground state of $^{70}$Br, $t_{1/2}=78.42\pm0.51$ ms, which is slightly more precise, and in excellent agreement, with the best measurement reported hitherto in the literature. For this decay, we provide the first estimate of the total branching fraction decaying through the $2^+_1$ state in the daughter nucleus $^{70}$Se, $R(2^+_1)=1.3\pm1.1\%$. We also report four new low-intensity $\gamma$-ray transitions at 661, 1103, 1561, and 1749 keV following the $\beta$ decay of the $J^{\pi}=9^+$ isomer. Based on their coincidence relationships, we tentatively propose two new excited states at 3945 and 4752 keV in $^{70}$Se with most probable spins and parities of $J^{\pi}=(6^+)$ and $(8^+)$, respectively. The observed structure is interpreted with the help of shell-model calculations, which predict a complex interplay between oblate and prolate configurations at low excitation energies.

Published
2017
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9. Conceptual design of the BRIKEN detector: A hybrid neutron-gamma detection system for nuclear physics at the RIB facility of RIKEN

Author

Tarifeño-Saldivia, A., Tain, J. L., Domingo-Pardo, C., Calviño, F., Cortes, G., Phong, V. H., Riego, A., and collaboration, The BRIKEN

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

BRIKEN is a complex detection system to be installed at the RIB-facility of the RIKEN Nishina Center. It is aimed at the detection of heavy-ion implants, $\beta$-particles, $\gamma$-rays and $\beta$-delayed neutrons. The whole detection setup involves the Advanced Implantation Detection Array (AIDA), two HPGe Clover detectors and a large set of 166 counters of 3He embedded in a high-density polyethylene matrix. This article reports on a novel methodology developed for the conceptual design and optimisation of the 3He-tubes array, aiming at the best possible performance in terms of neutron detection. The algorithm is based on a geometric representation of two selected parameters of merit, namely, average neutron detection efficiency and efficiency flatness, as a function of a reduced number of geometric variables. The response of the detection system itself, for each configuration, is obtained from a systematic MC-simulation implemented realistically in Geant4. This approach has been found to be particularly useful. On the one hand, due to the different types and large number of 3He-tubes involved and, on the other hand, due to the additional constraints introduced by the ancillary detectors for charged particles and gamma-rays. Empowered by the robustness of the algorithm, we have been able to design a versatile detection system, which can be easily re-arranged into a compact mode in order to maximize the neutron detection performance, at the cost of the gamma-ray sensitivity. In summary, we have designed a system which shows, for neutron energies up to 1(5) MeV, a rather flat and high average efficiency of 68.6%(64%) and 75.7%(71%) for the hybrid and compact modes, respectively. The performance of the BRIKEN system has been also quantified realistically by means of MC-simulations made with different neutron energy distributions.

Published
2016
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10. New neutron-deficient isotopes from $^{78}$Kr fragmentation

Author

Blank, B., Goigoux, T., Ascher, P., Gerbaux, M., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Agramunt, J., Algora, A., Guadilla, V., Montaner-Piza, A., Morales, A. I., Orrigo, S. E. A., Rubio, B., Ahn, D. S., Doornenbal, P., Fukuda, N., Inabe, N., Kiss, G., Kubo, T., Kubono, S., Nishimura, S., Phong, V. H., Sakurai, H., Shimizu, Y., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Wu, J., Fujita, Y., Tanaka, M., Gelletly, W., Aguilera, P., Molina, F., Diel, F., Lubos, D., de Angelis, G., Napoli, D., Borcea, C., Boso, A., Cakirli, R. B., Ganioglu, E., Chiba, J., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Wimmer, K., de France, G., and Go, S.

Subjects
Nuclear Experiment
Abstract

In an experiment with the BigRIPS separator at the RIKEN Nishina Center, the fragmentation of a $^{78}$Kr beam allowed the observation of new neutron-deficient isotopes at the proton drip-line. Clean identification spectra could be produced and $^{63}$Se, $^{67}$Kr, and $^{68}$Kr were identified for the first time. In addition, $^{59}$Ge was also observed. Three of these isotopes, $^{59}$Ge, $^{63}$Se, and $^{67}$Kr, are potential candidates for ground-state two-proton radioactivity. In addition, the isotopes $^{58}$Ge, $^{62}$Se, and $^{66}$Kr were also sought but without success. The present experiment also allowed the determination of production cross sections for some of the most exotic isotopes. These measurements confirm the trend already observed that the empirical parameterization of fragmentation cross sections, EPAX, significantly overestimates experimental cross sections in this mass region., Comment: accepted as Rapid Communication in PRC

Published
2016
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11. Improving Nuclear Data Input for r-Process Calculations Around A 80

Author

Tolosa-Delgado, A., Agramunt, J., Ahn, D. S., Algora, A., Baba, H., Bae, S., Brewer, N. T., Bruno, C., Caballero Folch, R., Calviño, F., Coleman-Smith, P. J., Cortés, G., Davinson, T., Dillmann, I., Domingo-Pardo, C., Estrade, A., Fukuda, N., Go, S., Griffin, C. J., Grzywacz, R., Ha, J., Hall, O., Harkness-Brennan, L., Isobe, T., Kahl, D., Karny, M., Khiem, L. H., Kiss, G. G., Kogimtzis, M., Kubono, S., Labiche, M., Lazarus, I., Lee, J., Liang, J., Liu, J., Lorusso, G., Matsui, K., Miernik, K., Montes, F., Moon, B., Morales, A. I., Nepal, N., Nishimura, S., Page, R. D., Phong, V. H., Podolyak, Z., Pucknell, V. F. E., Rasco, B. C., Regan, P., Riego, A., Rubio, B., Rykaczewski, K. P., Saito, Y., Sakurai, H., Shimizu, Y., Simpson, J., Söderström, P.-A., Stracener, D. W., Sumikama, T., Suzuki, H., Tain, J. L., Takechi, M., Takeda, H., Tarifeño-Saldivia, A., Thomas, S. L., Woods, P. J., Xu, X. X., Yokoyama, R., Formicola, Alba, editor, Junker, Matthias, editor, Gialanella, Lucio, editor, and Imbriani, Gianluca, editor

Published
2019
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12. 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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13. Experimental studies on astrophysical reactions at the low-energy RI beam separator CRIB

Author

Yamaguchi H., Hayakawa S., Ma N.R., Shimizu H., Okawa K., Yang L., Kahl D., La Cognata M., Lamia L., Abe K., Beliuskina O., Cha S.M., Chae K.Y., Cherubini S., Figuera P., Ge Z., Gulino M., Hu J., Inoue A., Iwasa N., Kim A., Kim D., Kiss G., Kubono S., La Commara M., Lattuada M., Lee E.J., Moon J.Y., Palmerini S., Parascandolo C., Park S.Y., Phong V. H., Pierroutsakou D., Pizzone R.G., Rapisarda G.G., Romano S., Spitaleri C., Tang X.D., Trippella O., Tumino A., Zhang N.T., Lam Y.H., Heger A., Jacobs A.M., Xu S.W., Ma S.B., Ru L.H., Liu E.Q., Liu T., Hamill C.B., St J. Murphy A., Su J., Fang X., Kwag M.S., Duy N.N., Uyen N.K., Kim D.H., Liang J, Psaltis A., Sferrazza M., Johnston Z., and Li Y.Y.

Subjects
Physics, QC1-999
Abstract

Experimental studies on astrophysical reactions involving radioactive isotopes (RI) often accompany technical challenges. Studies on such nuclear reactions have been conducted at the low-energy RI beam separator CRIB, operated by Center for Nuclear Study, the University of Tokyo. We discuss two cases of astrophysical reaction studies at CRIB; one is for the 7Be+n reactions which may affect the primordial 7Li abundance in the Big-Bang nucleosynthesis, and the other is for the 22Mg(α, p) reaction relevantin X-raybursts.

Published
2022
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14. Improving Nuclear Data Input for r-Process Calculations Around A $$\sim $$ 80

Author

Tolosa-Delgado, A., primary, Agramunt, J., additional, Ahn, D. S., additional, Algora, A., additional, Baba, H., additional, Bae, S., additional, Brewer, N. T., additional, Bruno, C., additional, Caballero Folch, R., additional, Calviño, F., additional, Coleman-Smith, P. J., additional, Cortés, G., additional, Davinson, T., additional, Dillmann, I., additional, Domingo-Pardo, C., additional, Estrade, A., additional, Fukuda, N., additional, Go, S., additional, Griffin, C. J., additional, Grzywacz, R., additional, Ha, J., additional, Hall, O., additional, Harkness-Brennan, L., additional, Isobe, T., additional, Kahl, D., additional, Karny, M., additional, Khiem, L. H., additional, Kiss, G. G., additional, Kogimtzis, M., additional, Kubono, S., additional, Labiche, M., additional, Lazarus, I., additional, Lee, J., additional, Liang, J., additional, Liu, J., additional, Lorusso, G., additional, Matsui, K., additional, Miernik, K., additional, Montes, F., additional, Moon, B., additional, Morales, A. I., additional, Nepal, N., additional, Nishimura, S., additional, Page, R. D., additional, Phong, V. H., additional, Podolyak, Z., additional, Pucknell, V. F. E., additional, Rasco, B. C., additional, Regan, P., additional, Riego, A., additional, Rubio, B., additional, Rykaczewski, K. P., additional, Saito, Y., additional, Sakurai, H., additional, Shimizu, Y., additional, Simpson, J., additional, Söderström, P.-A., additional, Stracener, D. W., additional, Sumikama, T., additional, Suzuki, H., additional, Tain, J. L., additional, Takechi, M., additional, Takeda, H., additional, Tarifeño-Saldivia, A., additional, Thomas, S. L., additional, Woods, P. J., additional, Xu, X. X., additional, and Yokoyama, R., additional

Published
2019
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15. Study of α-cluster Structure in 22Mg Using a Radioactive Ion Beam

Author

Cha, S. M., Chae, K. Y., Kim, M. J., Kwag, M. S., Lee, E. J., Abe, K., Hayakawa, S., Shimizu, H., Yamaguchi, H., Yang, L., Bae, S. H., Choi, S. H., Binh, D. N., Duy, N. N., Ge, Z., Phong, V. H., Hahn, K. I., Hong, B., Moon, B., Iwasa, N., Kahl, D., Khiem, L. H., Kim, A., Kim, D. H., Kim, G. W., Lim, S. I., Park, S. Y., Kim, E. J., Kwak, K., and Moon, J. Y.

Published
2018
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16. Investigation of 22Mg levels via resonant scattering of 18Ne + α

Author

Cha, S. M., primary, Chae, K. Y., additional, Abe, K., additional, Bae, S., additional, Binh, D. N., additional, Choi, S. H., additional, Duy, N. N., additional, Ge, Z., additional, Hahn, K. I., additional, Hayakawa, S., additional, Hong, B., additional, Iwasa, N., additional, Kahl, D., additional, Khiem, L. H., additional, Kim, A., additional, Kim, D., additional, Kim, E. J., additional, Kim, G. W., additional, Kim, M. J., additional, Kwak, K., additional, Kwag, M. S., additional, Lee, E. J., additional, Lim, S. I., additional, Moon, B., additional, Moon, J. Y., additional, Park, S. Y., additional, Phong, V. H., additional, Shimizu, H., additional, Yamaguchi, H., additional, and Yang, L., additional

Published
2023
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17. First observation of isomeric states in Zr111, Nb113 , and Mo115

Author

Wu, J., primary, Nishimura, S., additional, Söderström, P.-A., additional, Algora, A., additional, Liu, J. J., additional, Phong, V. H., additional, Wu, Y. Q., additional, Xu, F. R., additional, Agramunt, J., additional, Ahn, D. S., additional, Berry, T. A., additional, Bruno, C. G., additional, Bundgaard, J. J., additional, Caballero-Folch, R., additional, Dai, A. C., additional, Davinson, T., additional, Dillmann, I., additional, Estrade, A., additional, Fijałkowska, A., additional, Fukuda, N., additional, Go, S., additional, Grzywacz, R. K., additional, Isobe, T., additional, Kubono, S., additional, Lorusso, G., additional, Matsui, K., additional, Morales, A. I., additional, Nepal, N., additional, Orrigo, S. E. A., additional, Rasco, B. C., additional, Rykaczewski, K. P., additional, Sakurai, H., additional, Shimizu, Y., additional, Stracener, D. W., additional, Sumikama, T., additional, Suzuki, H., additional, Tain, J. L., additional, Takeda, H., additional, Tarifeño-Saldivia, A., additional, Tolosa-Delgado, A., additional, Wolińska-Cichocka, M., additional, and Yokoyama, R., additional

Published
2022
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18. β -Delayed One and Two Neutron Emission Probabilities Southeast of Sn132 and the Odd-Even Systematics in r -Process Nuclide Abundances

Author

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

Published
2022
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19. The beta-decay of Kr-70 into Br-70: Restoration of the pseudo-SU(4) symmetry

Author

Vitez-Sveiczer, A., Algora, A., Morales, A., I, Rubio, B., Kiss, G. G., Sarriguren, P., Van Isacker, P., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V, Montaner-Piza, A., Orrigo, S. E. A., Horvath, A., Napoli, D., Lenzi, S., Boso, A., Phong, V. H., Wu, J., Soderstrom, P-A, Sumikama, T., Suzuki, H., Takeda, H., Ahn, D. S., Baba, H., Doornebal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sidong, C., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Gelletly, W., Dombradi, Zs, Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I, Kurz, N., Shaffner, H., Petrovici, A., Vitez-Sveiczer, A., Algora, A., Morales, A., I, Rubio, B., Kiss, G. G., Sarriguren, P., Van Isacker, P., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V, Montaner-Piza, A., Orrigo, S. E. A., Horvath, A., Napoli, D., Lenzi, S., Boso, A., Phong, V. H., Wu, J., Soderstrom, P-A, Sumikama, T., Suzuki, H., Takeda, H., Ahn, D. S., Baba, H., Doornebal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sidong, C., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Gelletly, W., Dombradi, Zs, Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I, Kurz, N., Shaffner, H., and Petrovici, A.

Abstract

The beta-decay of the even-even nucleus Kr-70 with Z=N+2, has been investigated at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center using the BigRIPS fragment separator, the ZeroDegree Spectrometer, the WAS3ABI implantation station and the EURICA HPGe cluster array. Fifteen gamma-rays associated with the beta-decay of( 70)Kr into Br-70 have been identified for the first time, defining ten populated states below E-exc=3300 keV. The half-life of Kr-70 was derived with increased precision and found to be t(1/2)=45.19 +/- 0.14 ms. The beta-delayed proton emission probability has also been determined as epsilon(p)=0.545(23)%. An increase in the beta-strength to the yrast 1(+) state in comparison with the heaviest Z=N+2 system studied so far (Ge-62 decay) is observed that may indicate increased np correlations in the T=0 channel. The beta-decay strength deduced from the results is interpreted in terms of the proton-neutron quasiparticle random-phase approximation (pnQRPA) and also with a schematic model that includes isoscalar and isovector pairing in addition to quadrupole deformation. The application of this last model indicates an approximate realization of pseudo-SU(4) symmetry in this system. (C) 2022 The Author(s). Published by Elsevier B.V.

Published
2022

20. Commissioning of the BRIKEN beta-delayed neutron detector for the study of exotic neutron-rich nuclei

Author

Tolosa-Delgado A., Agramunt J., Ahn D. S., Algora A., Baba H., Bae S., Brewer N. T., Caballero Folch R., Calvino F., Coleman-Smith P. J., Cortes G., Davinson T., Dillmann I., Domingo-Pardo C., Estrade A., Fukuda N., Go S., Griffin C. J., Grzywacz R., Ha J., Hall O., Harkness-Brennan L., Isobe T., Kahl D., Kiss G. G., Kogimtzis M., Kubono S., Labiche M., Lazarus I., Lee J., Liu J., Lorusso G., Matsui K., Miernik K., Montes F., Moon B., Morales A.I., Nepal N., Nishimura S., Page R. D., Phong V. H., Podolyak Z., Pucknell V. F. E., Rasco B. C., Regan P., Riego A., Rubio B., Rykaczewski K.P., Saito Y., Sakurai H., Shimizu Y., Simpson J., Söderström P.-A., Stracener D. W., Sumikama T., Suzuki H., Tain J. L., Takechi M., Takeda H., Tarifeño-Saldivia A., Thomas S. L., and Woods P.

Subjects
Physics, QC1-999
Abstract

The commissioning of a new setup for β-delayed neutron measurements was carried out successfully in November-2016, at the RIKEN Nishina Center in Japan. The β-decay half-lives and Pn branching ratios of several isotopes in the 78Ni region were measured. Details of the experimental setup and the first results are given.

Published
2017
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21. Constraining the Primordial Lithium Abundance: New Cross Section Measurement of the 7Be + n Reactions Updates the Total 7Be Destruction Rate

Author

Hayakawa, S., primary, La Cognata, M., additional, Lamia, L., additional, Yamaguchi, H., additional, Kahl, D., additional, Abe, K., additional, Shimizu, H., additional, Yang, L., additional, Beliuskina, O., additional, Cha, S. M., additional, Chae, K. Y., additional, Cherubini, S., additional, Figuera, P., additional, Ge, Z., additional, Gulino, M., additional, Hu, J., additional, Inoue, A., additional, Iwasa, N., additional, Kim, A., additional, Kim, D., additional, Kiss, G., additional, Kubono, S., additional, La Commara, M., additional, Lattuada, M., additional, Lee, E. J., additional, Moon, J. Y., additional, Palmerini, S., additional, Parascandolo, C., additional, Park, S. Y., additional, Phong, V. H., additional, Pierroutsakou, D., additional, Pizzone, R. G., additional, Rapisarda, G. G., additional, Romano, S., additional, Spitaleri, C., additional, Tang, X. D., additional, Trippella, O., additional, Tumino, A., additional, and Zhang, N. T., additional

Published
2021
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22. β decay of the very neutron-deficient Ge60 and Ge62 nuclei

Author

Orrigo, S. E. A., Rubio, B., Gelletly, W., Aguilera, P., Algora, A., Morales, A. I., Agramunt, J., Ahn, D. S., Ascher, P., Blank, B., Borcea, C., Boso, A., Cakirli, R. B., Chiba, J., De Angelis, G., De France, G., Diel, F., Doornenbal, P., Fujita, Y., Fukuda, N., Ganioglu, E., Gerbaux, M., Giovinazzo, J., Go, S., Goigoux, T., Grevy, S., Guadilla, V., Inabe, N., Kiss, G. G., Kubo, T., Kubono, S., Kurtukian-Nieto, T., Lubos, D., Magron, C., Molina, F., Montaner-Piza, A., Napoli, D., Nishimura, D., Nishimura, S., Oikawa, H., Phong, V. H., Sakurai, H., Shimizu, Y., Sidong, C., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., Wu, J., and Yagi, S.

Published
2021

23. beta decay of the very neutron-deficient Ge-60 and Ge-62 nuclei

Author

Orrigo, S. E. A., Rubio, B., Gelletly, W., Aguilera, P., Algora, A., Morales, A., I, Agramunt, J., Ahn, D. S., Ascher, P., Blank, B., Borcea, C., Boso, A., Cakirli, R. B., Chiba, J., de Angelis, G., de France, G., Diel, F., Doornenbal, P., Fujita, Y., Fukuda, N., Ganioglu, E., Gerbaux, M., Giovinazzo, J., Go, S., Goigoux, T., Grevy, S., Guadilla, V, Inabe, N., Kiss, G. G., Kubo, T., Kubono, S., Kurtukian-Nieto, T., Lubos, D., Magron, C., Molina, F., Montaner-Piza, A., Napoli, D., Nishimura, D., Nishimura, S., Oikawa, H., Phong, V. H., Sakurai, H., Shimizu, Y., Sidong, C., Soderstrom, P-A, Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., Wu, J., Yagi, S., Orrigo, S. E. A., Rubio, B., Gelletly, W., Aguilera, P., Algora, A., Morales, A., I, Agramunt, J., Ahn, D. S., Ascher, P., Blank, B., Borcea, C., Boso, A., Cakirli, R. B., Chiba, J., de Angelis, G., de France, G., Diel, F., Doornenbal, P., Fujita, Y., Fukuda, N., Ganioglu, E., Gerbaux, M., Giovinazzo, J., Go, S., Goigoux, T., Grevy, S., Guadilla, V, Inabe, N., Kiss, G. G., Kubo, T., Kubono, S., Kurtukian-Nieto, T., Lubos, D., Magron, C., Molina, F., Montaner-Piza, A., Napoli, D., Nishimura, D., Nishimura, S., Oikawa, H., Phong, V. H., Sakurai, H., Shimizu, Y., Sidong, C., Soderstrom, P-A, Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., Wu, J., and Yagi, S.

Abstract

We report here the results of a study of the beta decay of the proton-rich Ge isotopes, Ge-60 and Ge-62, produced in an experiment at the RIKEN Nishina Center. We have improved our knowledge of the half-lives of Ge-62 [73.5(1) ms] and Ge-60 [25.0(3) ms] and its daughter nucleus, Ga-60 [69.4(2) ms]. We measured individual beta-delayed proton and gamma emissions and their related branching ratios. Decay schemes and absolute Fermi and Gamow-Teller transition strengths have been determined. The mass excesses of the nuclei under study have been deduced. A total beta-delayed proton-emission branching ratio of 67(3)% has been obtained for Ge-60. New information has been obtained on the energy levels populated in Ga-60 and on the 1/2(-) excited state in the beta p daughter Zn-59. We extracted a ground state-to-ground state feeding of 85.3(3)% for the decay of Ge-62. Eight new y lines have been added to the deexcitation of levels populated in the Ga-62 daughter.

Published
2021

24. Shape coexistence revealed in the N= Z isotope 72 Kr through inelastic scattering

Author

Wimmer, K., Arici, T., Korten, W., Doornenbal, P., Delaroche, J. P., Girod, M., Libert, J., Rodríguez, T. R., Aguilera, P., Algora, A., Ando, T., Baba, H., Blank, B., Boso, A., Chen, S., Corsi, A., Davies, P., de Angelis, G., de France, G., Doherty, D. T., Gerl, J., Gernhäuser, R., Goigoux, T., Jenkins, D., Kiss, G., Koyama, S., Motobayashi, T., Nagamine, S., Niikura, M., Nishimura, S., Obertelli, A., Lubos, D., Phong, V. H., Rubio, B., Sahin, E., Saito, T. Y., Sakurai, H., Sinclair, L., Steppenbeck, D., Taniuchi, R., Vaquero, V., Wadsworth, R., Wu, J., and Zielinska, M.

Abstract

The N= Z= 36 nucleus 72Kr has been studied by inelastic scattering at intermediate energies. Two targets, 9Be and 197Au, were used to extract the nuclear deformation length, δN, and the reduced E2 transition probability, B(E2). The previously unknown non-yrast 2 + and 4 + states as well as a new candidate for the octupole 3 - state have been observed in the scattering on the Be target and placed in the level scheme based on γ- γ coincidences. The second 2 + state was also observed in the scattering on the Au target and the B(E2;22+→01+) value could be determined for the first time. Analyzing the results in terms of a two-band mixing model shows clear evidence for a oblate-prolate shape coexistence and can be explained by a shape change from an oblate ground state to prolate deformed yrast band from the first 2 + state. This interpretation is corroborated by beyond mean field calculations using the Gogny D1S interaction.

Published
2020

25. Studying the exotic decay 70Kr → 70Br

Author

Vitez-Sveiczer, A., Algora, A., Morales, A. I., Rubio, B., Kiss, G. G., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V., Montaner-Piza, A., Orrigo, S. E. A., Horvath, A., Napoli, D., Lenzi, S., Boso, A., Phong, V. H., Wu, J., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D. S., Baba, H., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Chen, S., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grevy, S., Kurtukian Nieto, T., Magron, C., Gelletly, W., Dombradi, Z., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., De France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., and Shaffner, H.

Published
2020

26. STUDYING THE EXOTIC DECAY Kr-70 -> Br-70

Author

Vitez-Sveiczer, A., Algora, A., Morales, A. I., Rubio, B., Kiss, G. G., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V., Montaner-Piza, A., Orrigo, S. E. A., Horvath, A., Napoli, D., Lenzi, S., Boso, A., Phong, V. H., Wu, J., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D. S., Baba, H., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Chen, S., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grevy, S., Kurtukian Nieto, T., Magron, C., Gelletly, W., Dombradi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., Shaffner, H., Vitez-Sveiczer, A., Algora, A., Morales, A. I., Rubio, B., Kiss, G. G., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V., Montaner-Piza, A., Orrigo, S. E. A., Horvath, A., Napoli, D., Lenzi, S., Boso, A., Phong, V. H., Wu, J., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D. S., Baba, H., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Chen, S., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grevy, S., Kurtukian Nieto, T., Magron, C., Gelletly, W., Dombradi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., and Shaffner, H.

Abstract

Beta-decay of the very neutron-deficient Kr isotope, Kr-70, was studied at RIKEN-RIBF using the EURICA cluster array. The experiment significantly increased our knowledge of the beta-decay of this isotope. Namely, 16 new gamma-ray transitions were identified and the half-life was derived from time correlations of the beta particles (t(1/2)(i beta) = (44.99 +/- 0.16) ms) and from the decay curves of the observed gamma-ray transitions (t(1/2)(i beta gamma) = (45.16 +/- 0.71) ms), respectively.

Published
2020

27. β decay of the very neutron-deficient Ge60 and Ge62 nuclei

Author

Orrigo, S. E. A., primary, Rubio, B., additional, Gelletly, W., additional, Aguilera, P., additional, Algora, A., additional, Morales, A. I., additional, Agramunt, J., additional, Ahn, D. S., additional, Ascher, P., additional, Blank, B., additional, Borcea, C., additional, Boso, A., additional, Cakirli, R. B., additional, Chiba, J., additional, de Angelis, G., additional, de France, G., additional, Diel, F., additional, Doornenbal, P., additional, Fujita, Y., additional, Fukuda, N., additional, Ganioğlu, E., additional, Gerbaux, M., additional, Giovinazzo, J., additional, Go, S., additional, Goigoux, T., additional, Grévy, S., additional, Guadilla, V., additional, Inabe, N., additional, Kiss, G. G., additional, Kubo, T., additional, Kubono, S., additional, Kurtukian-Nieto, T., additional, Lubos, D., additional, Magron, C., additional, Molina, F., additional, Montaner-Pizá, A., additional, Napoli, D., additional, Nishimura, D., additional, Nishimura, S., additional, Oikawa, H., additional, Phong, V. H., additional, Sakurai, H., additional, Shimizu, Y., additional, Sidong, C., additional, Söderström, P.-A., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Takei, Y., additional, Tanaka, M., additional, Wu, J., additional, and Yagi, S., additional

Published
2021
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28. Isomeric and β -decay spectroscopy of Ho173,174

Author

Liu, J. J., primary, Lee, J., additional, Watanabe, H., additional, Nishimura, S., additional, Zhang, G. X., additional, Wu, J., additional, Walker, P. M., additional, Regan, P. H., additional, Söderström, P.-A., additional, Kanaoka, H., additional, Korkulu, Z., additional, Lee, P. S., additional, Yagi, A., additional, Dai, A. C., additional, Xu, F. R., additional, Ahn, D. S., additional, Alharbi, T., additional, Baba, H., additional, Browne, F., additional, Bruce, A. M., additional, Carroll, R. J., additional, Chae, K. Y., additional, Dombradi, Zs., additional, Doornenbal, P., additional, Estrade, A., additional, Fukuda, N., additional, Griffin, C., additional, Ideguchi, E., additional, Inabe, N., additional, Isobe, T., additional, Kanaya, S., additional, Kojouharov, I., additional, Kondev, F. G., additional, Kubo, T., additional, Kubono, S., additional, Kurz, N., additional, Kuti, I., additional, Lalkovski, S., additional, Lane, G. J., additional, Lee, C. S., additional, Lee, E. J., additional, Lorusso, G., additional, Lotay, G., additional, Moon, C.-B., additional, Nishizuka, I., additional, Nita, C. R., additional, Odahara, A., additional, Patel, Z., additional, Phong, V. H., additional, Podolyák, Zs., additional, Roberts, O. J., additional, Sakurai, H., additional, Schaffner, H., additional, Shand, C. M., additional, Shimizu, Y., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Terashima, S., additional, Vajta, Zs., additional, Valiente-Dobón, J. J., additional, and Xu, Z. Y., additional

Published
2020
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29. Shape coexistence revealed in the $$N=Z$$ isotope $$^{72}$$Kr through inelastic scattering

Author

Wimmer, K., primary, Arici, T., additional, Korten, W., additional, Doornenbal, P., additional, Delaroche, J.-P., additional, Girod, M., additional, Libert, J., additional, Rodríguez, T. R., additional, Aguilera, P., additional, Algora, A., additional, Ando, T., additional, Baba, H., additional, Blank, B., additional, Boso, A., additional, Chen, S., additional, Corsi, A., additional, Davies, P., additional, de Angelis, G., additional, de France, G., additional, Doherty, D. T., additional, Gerl, J., additional, Gernhäuser, R., additional, Goigoux, T., additional, Jenkins, D., additional, Kiss, G., additional, Koyama, S., additional, Motobayashi, T., additional, Nagamine, S., additional, Niikura, M., additional, Nishimura, S., additional, Obertelli, A., additional, Lubos, D., additional, Phong, V. H., additional, Rubio, B., additional, Sahin, E., additional, Saito, T. Y., additional, Sakurai, H., additional, Sinclair, L., additional, Steppenbeck, D., additional, Taniuchi, R., additional, Vaquero, V., additional, Wadsworth, R., additional, Wu, J., additional, and Zielinska, M., additional

Published
2020
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30. Observation of a μs isomer in ¹³⁴₄₉In₈₅ : Proton-neutron coupling 'southeast' of ¹³²₅₀Sn₈₂

Author

Phong, V. H., Lorusso, G., Davinson, T., Estrade, A., Hall, O., Liu, J., Matsui, K., Montes, F., Nishimura, S., Boso, A., Regan, P. H., Shearman, R., Xu, Z. Y., Agramunt, J., Allmond, J. M., Ahn, D. S., Algora, A., Baba, H., Brewer, N. T., Bruno, C. G., Caballero-Folch, R., Calvino, F., Wolińska-Cichocka, M., Cortes, G., Dillmann, I., Domingo-Pardo, C., Gargano, A., Go, S., Griffin, C. J., Grzywacz, R. K., Harkness-Brennan, L., Isobe, T., Jungclaus, A., Kahl, D., Khiem, L. H., Kiss, G., Korgul, A., Kubono, S., Miernik, K., Morales, A. I., Nepal, N., Piersa, M., Podolyak, Zs., Rasco, B. C., Rykaczewski, K. P., Sakurai, H., Shimizu, Y., Stacener, D. W., Sumikama, T., Suzuki, H., Takeda, H., Tain, J. L., Tarifeño-Saldivia, A., Tolosa-Delgado, A., Vaquero, V., Woods, P. J., Yokoyama, R., and Yuan, C.

Abstract

We report on the observation of a microsecond isomeric state in the single-proton-hole, three-neutron-particle nucleus ¹³⁴In. The nuclei of interest were produced by in-flight fission of a ²³⁸U beam at the Radioactive Isotope Beam Factory at RIKEN. The isomer depopulates through a γ ray of energy 56.7(1) keV and with a half-life of T1/2=3.5(4)μs. Based on the comparison with shell-model calculations, we interpret the isomer as the Iπ=5− member of the π0g−19/2⊗ν1f37/2 multiplet, decaying to the Iπ=7− ground state with a reduced-transition probability of B(E2;5−→7−)=0.53(6)W.u.Observation of this isomer, and lack of evidence in the current work for a Iπ=5− isomer decay in ¹³²In, provides a benchmark of the proton-neutron interaction in the region of the nuclear chart “southeast” of ¹³²Sn, where experimental information on excited states is sparse.

Published
2019

31. 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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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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33. Observation of a μs isomer in In8549134 : Proton-neutron coupling “southeast” of Sn8250132

Author

Phong, V. H., primary, Lorusso, G., additional, Davinson, T., additional, Estrade, A., additional, Hall, O., additional, Liu, J., additional, Matsui, K., additional, Montes, F., additional, Nishimura, S., additional, Boso, A., additional, Regan, P. H., additional, Shearman, R., additional, Xu, Z. Y., additional, Agramunt, J., additional, Allmond, J. M., additional, Ahn, D. S., additional, Algora, A., additional, Baba, H., additional, Brewer, N. T., additional, Bruno, C. G., additional, Caballero-Folch, R., additional, Calvino, F., additional, Wolińska-Cichocka, M., additional, Cortes, G., additional, Dillmann, I., additional, Domingo-Pardo, C., additional, Gargano, A., additional, Go, S., additional, Griffin, C. J., additional, Grzywacz, R. K., additional, Harkness-Brennan, L., additional, Isobe, T., additional, Jungclaus, A., additional, Kahl, D., additional, Khiem, L. H., additional, Kiss, G., additional, Korgul, A., additional, Kubono, S., additional, Miernik, K., additional, Morales, A. I., additional, Nepal, N., additional, Piersa, M., additional, Podolyák, Zs., additional, Rasco, B. C., additional, Rykaczewski, K. P., additional, Sakurai, H., additional, Shimizu, Y., additional, Stacener, D. W., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Tain, J. L., additional, Tarifeño-Saldivia, A., additional, Tolosa-Delgado, A., additional, Vaquero, V., additional, Woods, P. J., additional, Yokoyama, R., additional, and Yuan, C., additional

Published
2019
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34. Simultaneous investigation of the T=1(J=0+) and T=0(J=9+) gamma decays in Br 70

Author

Morales, A. I., Algora, A., Rubio, B., Kaneko, K., Nishimura, S., Aguilera, P., Orrigo, S. E. A., Molina, F., De Angelis, G., Recchia, F., Kiss, G., Phong, V. H., Wu, J., Nishimura, D., Oikawa, H., Goigoux, T., Giovinazzo, J., Ascher, P., Agramunt, J., Ahn, D. S., Baba, H., Blank, B., Borcea, C., Boso, A., Davies, P., Diel, F., Dombrã¡di, Z. s., Doornenbal, P., Eberth, J., De France, G., Fujita, Y., Fukuda, N., Ganioglu, E., Gelletly, W., Gerbaux, M., Grã©vy, S., Guadilla, V., Inabe, N., Isobe, T., Kojouharov, I., Korten, W., Kubo, T., Kubono, S., Kurtukián Nieto, T., Kurz, N., Lee, J., Lenzi, S., Liu, J., Lokotko, T., Lubos, D., Magron, C., Montaner-Pizá, A., Napoli, D. R., Sakurai, H., Schaffner, H., Shimizu, Y., Sidong, C., Sã¶derstrã¶m, P. -. A., Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., and Yagi, S.

Subjects
Nuclear and High Energy Physics
Published
2017

35. STUDYING THE EXOTIC DECAY 70Kr → 70Br∗.

Author

VITÉZ-SVEICZER, A., ALGORA, A., MORALES, A. I., RUBIO, B., KISS, G. G., DE ANGELIS, G., RECCHIA, F., NISHIMURA, S., AGRAMUNT, J., GUADILLA, V., MONTANER-PIZÁ, A., ORRIGO, S. E. A., HORVÁTH, A., NAPOLI, D., LENZI, S., BOSO, A., PHONG, V. H., WU, J., SÖDERSTRÖM, P.-A., and SUMIKAMA, T.

Subjects
KRYPTON, BETA rays, ISOTOPES
Abstract

Beta-decay of the very neutron-deficient Kr isotope, 70Kr, was studied at RIKEN-RIBF using the EURICA cluster array. The experiment significantly increased our knowledge of the beta-decay of this isotope. Namely, 16 new γ-ray transitions were identified and the half-life was derived from time correlations of the beta particles (tiβ 1/2 = (44.99±0.16) ms) and from thedecaycurvesoftheobserved γ-raytransitions(tiβγ 1/2 = (45.16±0.71) ms), respectively. [ABSTRACT FROM AUTHOR]

Published
2020
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36. Simultaneous investigation of the T=1(J(pi)=0(+)) and T=0(J(pi)=9(+)) beta decays in Br-70

Author

Morales, A. I., Algora, A., Rubio, B., Kaneko, K., Nishimura, S., Aguilera, P., Orrigo, S. E. A., Molina, F., de Angelis, G., Recchia, F., Kiss, G., Phong, V. H., Wu, J., Nishimura, D., Oikawa, H., Goigoux, T., Giovinazzo, J., Ascher, P., Agramunt, J., Ahn, D. S., Baba, H., Blank, B., Borcea, C., Boso, A., Davies, P., Diel, F., Dombardi, Zs., Doornenbal, P., Eberth, J., de France, G., Fujita, Y., Fukuda, N., Ganioglu, E., Gelletly, W., Gerbaux, M., Grevy, S., Guadilla, V., Inabe, N., Isobe, T., Kojouharov, I., Korten, W., Kubo, T., Kubono, S., Nieto, T. Kurtukian, Kurz, N., Lee, J., Lenzi, S., Liu, J., Lokotko, T., Lubos, D., Magron, C., Montaner-Piza, A., Napoli, D. R., Sakurai, H., Schaffner, H., Shimizu, Y., Sidong, C., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., Yagi, S., Morales, A. I., Algora, A., Rubio, B., Kaneko, K., Nishimura, S., Aguilera, P., Orrigo, S. E. A., Molina, F., de Angelis, G., Recchia, F., Kiss, G., Phong, V. H., Wu, J., Nishimura, D., Oikawa, H., Goigoux, T., Giovinazzo, J., Ascher, P., Agramunt, J., Ahn, D. S., Baba, H., Blank, B., Borcea, C., Boso, A., Davies, P., Diel, F., Dombardi, Zs., Doornenbal, P., Eberth, J., de France, G., Fujita, Y., Fukuda, N., Ganioglu, E., Gelletly, W., Gerbaux, M., Grevy, S., Guadilla, V., Inabe, N., Isobe, T., Kojouharov, I., Korten, W., Kubo, T., Kubono, S., Nieto, T. Kurtukian, Kurz, N., Lee, J., Lenzi, S., Liu, J., Lokotko, T., Lubos, D., Magron, C., Montaner-Piza, A., Napoli, D. R., Sakurai, H., Schaffner, H., Shimizu, Y., Sidong, C., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., and Yagi, S.

Abstract

The beta decay of the odd-odd nucleus Br-70 has been investigated with the BigRIPS and EURICA setups at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center. The T = 0(J(pi) = 9(+)) and T = 1(J(pi) = 0(+)) isomers have both been produced in in-flight fragmentation of Kr-78 with ratios of 41.6(8)% and 58.4(8)%, respectively. A half-life of t(1/2) = 2157(-49)(+53) ms has been measured for the J pi = 9(+) isomer from gamma-ray time decay analysis. Based on this result, we provide a new value of the half-life for the J pi = 0(+) ground state of Br-70, t(1/2) = 78.42 +/- 0.51 ms, which is slightly more precise, and in excellent agreement, with the best measurement reported hitherto in the literature. For this decay, we provide the first estimate of the total branching fraction decaying through the 2(1)(+) state in the daughter nucleus Se-70, R(2(1)(+)) = 1.3 +/- 1.1%. We also report four new low-intensity gamma-ray transitions at 661, 1103, 1561, and 1749 keV following the beta decay of the J pi = 9(+) isomer. Based on their coincidence relationships, we tentatively propose two new excited states at 3945 and 4752 keV in 70Se with most probable spins and parities of J(pi) = (6(+)) and (8(+)), respectively. The observed structure is interpreted with the help of shell-model calculations, which predict a complex interplay between oblate and prolate configurations at low excitation energies.

Published
2017

37. Conceptual design of the BRIKEN detector: A hybrid neutron-gamma detection system for nuclear physics at the RIB facility of RIKEN

Author

Tarife��o-Saldivia, A., Tain, J. L., Domingo-Pardo, C., Calvi��o, F., Cortes, G., Phong, V. H., Riego, A., and collaboration, The BRIKEN

Subjects
Physics - Instrumentation and Detectors, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

BRIKEN is a complex detection system to be installed at the RIB-facility of the RIKEN Nishina Center. It is aimed at the detection of heavy-ion implants, $\beta$-particles, $\gamma$-rays and $\beta$-delayed neutrons. The whole detection setup involves the Advanced Implantation Detection Array (AIDA), two HPGe Clover detectors and a large set of 166 counters of 3He embedded in a high-density polyethylene matrix. This article reports on a novel methodology developed for the conceptual design and optimisation of the 3He-tubes array, aiming at the best possible performance in terms of neutron detection. The algorithm is based on a geometric representation of two selected parameters of merit, namely, average neutron detection efficiency and efficiency flatness, as a function of a reduced number of geometric variables. The response of the detection system itself, for each configuration, is obtained from a systematic MC-simulation implemented realistically in Geant4. This approach has been found to be particularly useful. On the one hand, due to the different types and large number of 3He-tubes involved and, on the other hand, due to the additional constraints introduced by the ancillary detectors for charged particles and gamma-rays. Empowered by the robustness of the algorithm, we have been able to design a versatile detection system, which can be easily re-arranged into a compact mode in order to maximize the neutron detection performance, at the cost of the gamma-ray sensitivity. In summary, we have designed a system which shows, for neutron energies up to 1(5) MeV, a rather flat and high average efficiency of 68.6%(64%) and 75.7%(71%) for the hybrid and compact modes, respectively. The performance of the BRIKEN system has been also quantified realistically by means of MC-simulations made with different neutron energy distributions.

Published
2016

38. Simultaneous investigation of the T=1(Jπ=0+) and T=0(Jπ=9+) β decays in Br70

Author

Morales, A. I., primary, Algora, A., additional, Rubio, B., additional, Kaneko, K., additional, Nishimura, S., additional, Aguilera, P., additional, Orrigo, S. E. A., additional, Molina, F., additional, de Angelis, G., additional, Recchia, F., additional, Kiss, G., additional, Phong, V. H., additional, Wu, J., additional, Nishimura, D., additional, Oikawa, H., additional, Goigoux, T., additional, Giovinazzo, J., additional, Ascher, P., additional, Agramunt, J., additional, Ahn, D. S., additional, Baba, H., additional, Blank, B., additional, Borcea, C., additional, Boso, A., additional, Davies, P., additional, Diel, F., additional, Dombrádi, Zs., additional, Doornenbal, P., additional, Eberth, J., additional, de France, G., additional, Fujita, Y., additional, Fukuda, N., additional, Ganioglu, E., additional, Gelletly, W., additional, Gerbaux, M., additional, Grévy, S., additional, Guadilla, V., additional, Inabe, N., additional, Isobe, T., additional, Kojouharov, I., additional, Korten, W., additional, Kubo, T., additional, Kubono, S., additional, Kurtukián Nieto, T., additional, Kurz, N., additional, Lee, J., additional, Lenzi, S., additional, Liu, J., additional, Lokotko, T., additional, Lubos, D., additional, Magron, C., additional, Montaner-Pizá, A., additional, Napoli, D. R., additional, Sakurai, H., additional, Schaffner, H., additional, Shimizu, Y., additional, Sidong, C., additional, Söderström, P.-A., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Takei, Y., additional, Tanaka, M., additional, and Yagi, S., additional

Published
2017
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39. β-Decay Studies of r-Process Nuclei Using the Advanced Implantation Detector Array (AIDA)

Author

Griffin, C. J., primary, Davinson, T., additional, Estrade, A., additional, Braga, D., additional, Burrows, I., additional, Coleman-Smith, P. J., additional, Grahn, T., additional, Grant, A., additional, Harkness-Brennan, L. J., additional, Kiss, G., additional, Kogimtzis, M., additional, Lazarus, I. H., additional, Letts, S. C., additional, Liu, Z., additional, Lorusso, G., additional, Matsui, K., additional, Nishimura, S., additional, Page, R. D., additional, Prydderch, M., additional, Phong, V. H., additional, Pucknell, V. F. E, additional, Rinta-Antila, S., additional, Roberts, O. J., additional, Seddon, D. A., additional, Simpson, J., additional, Thomas, S. L., additional, and Woods, P. J., additional

Published
2017
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40. New neutron-deficient isotopes from Kr-78 fragmentation

Author

Blank, B., Goigoux, T., Ascher, P., Gerbaux, M., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Agramunt, J., Algora, A., Guadilla, V., Montaner-Piza, A., Morales, A. I., Orrigo, S. E. A., Rubio, B., Ahn, D. S., Doornenbal, P., Fukuda, N., Inabe, N., Kiss, G., Kubo, T., Kubono, S., Nishimura, S., Phong, V. H., Sakurai, H., Shimizu, Y., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Wu, J., Fujita, Y., Tanaka, M., Gelletly, W., Aguilera, P., Molina, F., Diel, F., Lubos, D., de Angelis, G., Napoli, D., Borcea, C., Boso, A., Cakirli, R. B., Ganioglu, E., Chiba, J., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Wimmer, K., de France, G., Go, S., Blank, B., Goigoux, T., Ascher, P., Gerbaux, M., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Agramunt, J., Algora, A., Guadilla, V., Montaner-Piza, A., Morales, A. I., Orrigo, S. E. A., Rubio, B., Ahn, D. S., Doornenbal, P., Fukuda, N., Inabe, N., Kiss, G., Kubo, T., Kubono, S., Nishimura, S., Phong, V. H., Sakurai, H., Shimizu, Y., Soderstrom, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Wu, J., Fujita, Y., Tanaka, M., Gelletly, W., Aguilera, P., Molina, F., Diel, F., Lubos, D., de Angelis, G., Napoli, D., Borcea, C., Boso, A., Cakirli, R. B., Ganioglu, E., Chiba, J., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Wimmer, K., de France, G., and Go, S.

Abstract

In an experiment with the RIKEN projectile fragment separator called BigRIPS at the RIKEN Nishina Center, the fragmentation of a Kr-78 beam allowed the observation of new neutron-deficient isotopes at the proton drip line. Clean identification spectra could be produced and Se-63, Kr-67, and Kr-68 were identified for the first time. In addition, Ge-59 was also observed. Three of these isotopes, Ge-59, Se-63, and Kr-67, are potential candidates for ground-state two-proton radioactivity. In addition, the isotopes Ge-58, Se-62, and Kr-66 were also sought but without success. The present experiment also allowed the determination of production cross sections for some of the most exotic isotopes. These measurements confirm the trend already observed that the empirical parametrization of fragmentation cross sections, EPAX, significantly overestimates experimental cross sections in this mass region.

Published
2016

41. Two-Proton Radioactivity of Kr-67

Author

Goigoux, T., Ascher, P., Blank, B., Gerbaux, M., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Doornenbal, P., Kiss, G. G., Nishimura, S., Soederstroem, P. -A., Phong, V. H., Wu, J., Ahn, D. S., Fukuda, N., Inabe, N., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Agramunt, J., Algora, A., Guadilla, V., Montaner-Piza, A., Morales, A. I., Orrigo, S. E. A., Rubio, B., Fujita, Y., Tanaka, M., Gelletly, W., Aguilera, P., Molina, F., Diel, F., Lubos, D., de Angelis, G., Napoli, D., Borcea, C., Boso, A., Cakirli, R. B., Ganioglu, E., Chiba, J., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Wimmer, K., de France, G., Go, S., Brown, B. A., Goigoux, T., Ascher, P., Blank, B., Gerbaux, M., Giovinazzo, J., Grevy, S., Nieto, T. Kurtukian, Magron, C., Doornenbal, P., Kiss, G. G., Nishimura, S., Soederstroem, P. -A., Phong, V. H., Wu, J., Ahn, D. S., Fukuda, N., Inabe, N., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Agramunt, J., Algora, A., Guadilla, V., Montaner-Piza, A., Morales, A. I., Orrigo, S. E. A., Rubio, B., Fujita, Y., Tanaka, M., Gelletly, W., Aguilera, P., Molina, F., Diel, F., Lubos, D., de Angelis, G., Napoli, D., Borcea, C., Boso, A., Cakirli, R. B., Ganioglu, E., Chiba, J., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Wimmer, K., de France, G., Go, S., and Brown, B. A.

Abstract

In an experiment with the BigRIPS separator at the RIKEN Nishina Center, we observed two-proton (2p) emission from Kr-67. At the same time, no evidence for 2p emission of Ge-59 and Se-63, two other potential candidates for this exotic radioactivity, could be observed. This observation is in line with Q value predictions which pointed to Kr-67 as being the best new candidate among the three for two-proton radioactivity. Kr-67 is only the fourth 2p ground-state emitter to be observed with a half-life of the order of a few milliseconds. The decay energy was determined to be 1690(17) keV, the 2p emission branching ratio is 37(14)%, and the half-life of Kr-67 is 7.4(30) ms.

Published
2016

42. Two-Proton Radioactivity ofKr67

Author

Goigoux, T., primary, Ascher, P., additional, Blank, B., additional, Gerbaux, M., additional, Giovinazzo, J., additional, Grévy, S., additional, Kurtukian Nieto, T., additional, Magron, C., additional, Doornenbal, P., additional, Kiss, G. G., additional, Nishimura, S., additional, Söderström, P.-A., additional, Phong, V. H., additional, Wu, J., additional, Ahn, D. S., additional, Fukuda, N., additional, Inabe, N., additional, Kubo, T., additional, Kubono, S., additional, Sakurai, H., additional, Shimizu, Y., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Agramunt, J., additional, Algora, A., additional, Guadilla, V., additional, Montaner-Piza, A., additional, Morales, A. I., additional, Orrigo, S. E. A., additional, Rubio, B., additional, Fujita, Y., additional, Tanaka, M., additional, Gelletly, W., additional, Aguilera, P., additional, Molina, F., additional, Diel, F., additional, Lubos, D., additional, de Angelis, G., additional, Napoli, D., additional, Borcea, C., additional, Boso, A., additional, Cakirli, R. B., additional, Ganioglu, E., additional, Chiba, J., additional, Nishimura, D., additional, Oikawa, H., additional, Takei, Y., additional, Yagi, S., additional, Wimmer, K., additional, de France, G., additional, Go, S., additional, and Brown, B. A., additional

Published
2016
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43. New neutron-deficient isotopes fromKr78fragmentation

Author

Blank, B., primary, Goigoux, T., additional, Ascher, P., additional, Gerbaux, M., additional, Giovinazzo, J., additional, Grévy, S., additional, Kurtukian Nieto, T., additional, Magron, C., additional, Agramunt, J., additional, Algora, A., additional, Guadilla, V., additional, Montaner-Piza, A., additional, Morales, A. I., additional, Orrigo, S. E. A., additional, Rubio, B., additional, Ahn, D. S., additional, Doornenbal, P., additional, Fukuda, N., additional, Inabe, N., additional, Kiss, G., additional, Kubo, T., additional, Kubono, S., additional, Nishimura, S., additional, Phong, V. H., additional, Sakurai, H., additional, Shimizu, Y., additional, Söderström, P.-A., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Wu, J., additional, Fujita, Y., additional, Tanaka, M., additional, Gelletly, W., additional, Aguilera, P., additional, Molina, F., additional, Diel, F., additional, Lubos, D., additional, de Angelis, G., additional, Napoli, D., additional, Borcea, C., additional, Boso, A., additional, Cakirli, R. B., additional, Ganioglu, E., additional, Chiba, J., additional, Nishimura, D., additional, Oikawa, H., additional, Takei, Y., additional, Yagi, S., additional, Wimmer, K., additional, de France, G., additional, and Go, S., additional

Published
2016
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44. Status and results from the decay spectroscopy project EURICA (Euroball-RIKEN cluster array)

Author

Söderström, P.-A., primary, Doornenbal, P., additional, Lorusso, G., additional, Nishimura, S., additional, Wu, J., additional, Xu, Z. Y., additional, Baba, H., additional, Benzoni, G., additional, Browne, F., additional, Gey, G., additional, Isobe, T., additional, Jungclaus, A., additional, Kiss, G., additional, Kojouharov, I., additional, Kurz, N., additional, Lubos, D., additional, Moschner, K., additional, Patel, Z., additional, Phong, V. H., additional, Rice, S., additional, Sakurai, H., additional, Schaffner, H., additional, Simpson, G. S., additional, Sinclair, L., additional, Sumikama, T., additional, Taprogge, J., additional, Vajta, Zs., additional, Watanabe, H., additional, and Yagi, A., additional

Published
2016
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46. Heavy rotation – evolution of quadrupole collectivity centred at the neutron-rich doubly mid-shell nucleus 170Dy

Author

Söderström, P.-A., primary, Regan, P. H., additional, Walker, P. M., additional, Watanabe, H., additional, Doornenbal, P., additional, Korkulu, Z., additional, Lee, P., additional, Liu, H. L., additional, Liu, J. J., additional, Lorusso, G., additional, Nishimura, S., additional, Sumikama, T., additional, Phong, V. H., additional, Wu, J., additional, Xu, F. R., additional, Yagi, A., additional, Zhang, G. X., additional, Alharbi, T., additional, Baba, H., additional, Browne, F., additional, Bruce, A. M., additional, Carroll, R., additional, Chae, K. Y., additional, Dombradi, Zs., additional, Estrade, A., additional, Fukuda, N., additional, Griffin, C., additional, Ideguchi, E., additional, Inabe, N., additional, Isobe, T., additional, Kanaoka, H., additional, Kojouharov, I., additional, Kondev, F. G., additional, Kubo, T., additional, Kubono, S., additional, Kurz, N., additional, Kuti, I., additional, Lalkovski, S., additional, Lane, G. J., additional, Lee, C. S., additional, Lee, E. J., additional, Lotay, G., additional, Moon, C.-B., additional, Nishizuka, I., additional, Nita, C. R., additional, Odahara, A., additional, Patel, Z., additional, Podolyák, Zs., additional, Roberts, O. J., additional, Sakurai, H., additional, Schaffner, H., additional, Shand, C. M., additional, Suzuki, H., additional, Takeda, H., additional, Terashima, S., additional, Vajta, Zs., additional, Valiente-Dòbon, J. J., additional, Xu, Z. Y., additional, and Yoshida, S., additional

Published
2015
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47. Heavy Rotation - Evolution of quadrupole collectivity centred at the neutron-rich doubly mid-shell nucleus 170Dy.

Author

Söderström, P.-A., Regan, P. H., Walker, P. M., Watanabe, H., Doornenbal, P., Korkulu, Z., Lee, P., Liu, H. L., Liu, J. J., Lorusso, G., Nishimura, S., Sumikama, T., Phong, V. H., Wu, J., Xu, F. R., Yagi, A., Zhang, G. X., Alharbi, T., Baba, H., and Browne, F.

Subjects
NEUTRON spectroscopy, QUADRUPOLES, DYSPROSIUM, GROUND state energy, DOUBLY stochastic Poisson processes
Abstract

In this contribution the low-excitation structural properties of the doubly mid-shell nucleus 170Dy are discussed, with a special empasis on the evolution of the ground state rotational band within the dysprosium isotopic chain. Recent results from an experiment with the EURICA setup at RIKEN are shown in the context of previous measurements at the PRISMA+CLARA as well as the PRISMA+AGATA setups at Laboratori Nazionali di Legnaro. A brief outlook on future planned measurements is also given. [ABSTRACT FROM AUTHOR]

Published
2015
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48. Observation of a μs isomer in 13449In85: Proton-neutron coupling "southeast" of 13250Sn82.

Author

Phong, V. H.

Subjects
*ISOMERS, *NEUTRON-proton interactions, *RADIOACTIVE nuclear beams, *RADIOISOTOPES, *EXCITED states, *SKYRME model, *ION mobility
Abstract

We report on the observation of a microsecond isomeric state in the single-proton-hole, three-neutron-particle nucleus 134In. The nuclei of interest were produced by in-flight fission of a 238U beam at the Radioactive Isotope Beam Factory at RIKEN. The isomer depopulates through a γ ray of energy 56.7(1) keV and with a half-life of T1/2=3.5(4)μs. Based on the comparison with shell-model calculations, we interpret the isomer as the Iπ=5- member of the π0g-19/2⊗ν1f³7/2 multiplet, decaying to the Iπ=7- ground state with a reduced-transition probability of B(E2;5-→7-)=0.53(6)W.u. Observation of this isomer, and lack of evidence in the current work for a Iπ=5- isomer decay in 132In, provides a benchmark of the proton-neutron interaction in the region of the nuclear chart "southeast" of 132Sn, where experimental information on excited states is sparse. [ABSTRACT FROM AUTHOR]

Published
2019
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49. β decay of the very neutron-deficient Ge 60 and Ge 62 nuclei

Author

Orrigo, S. E. A., Rubio, B., Gelletly, W., Aguilera, P., Algora, A., Morales, A. I., Agramunt, J., Ahn, D. S., Ascher, P., Blank, B., Borcea, C., Boso, A., Cakirli, R. B., Chiba, J., de Angelis, G., de France, G., Diel, F., Doornenbal, P., Fujita, Y., Fukuda, N., Ganioğlu, E., Gerbaux, M., Giovinazzo, J., Go, S., Goigoux, T., Grévy, S., Guadilla, V., Inabe, N., Kiss, G. G., Kubo, T., Kubono, S., Kurtukian-Nieto, T., Lubos, D., Magron, C., Molina, F., Montaner-Pizá, A., Napoli, D., Nishimura, D., Nishimura, S., Oikawa, H., Phong, V. H., Sakurai, H., Shimizu, Y., Sidong, C., Söderström, P.-A., Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., Wu, J., and Yagi, S.

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50. Collective and single-particle structures in the neutron-rich doubly mid-shell nucleus dy

Author

Söderström, P. -A, Walker, P. M., Wu, J., Liu, H. L., Regan, P. H., Watanabe, H., Doornenbal, P., Korkulu, Z., Lee, P., Liu, J. J., Lorusso, G., Nishimura, S., Phong, V. H., Sumikama, T., Xu, F. R., Yagi, A., Zhang, G. X., Ahn, D. S., Alharbi, T., Baba, H., Browne, F., Bruce, A. M., Carrol, R. J., Chae, K. Y., Dombradi, Zs, Estrade, A., Fukuda, N., Griffin, C., Ideguchil, E., Inabe, N., Isobe, T., Kanaoka, H., Kanaya, S., Kojouharov, I., Kondev, F. G., Kubo, T., Kubono, S., Kurz, N., Kuti, I., Lalkovski, S., Lane, G. J., Lee, E. J., Lee, C. S., Lotay, G., Moon, C. -B, Nishizuka, I., Niţǎ, C. R., Odahara, A., Patel, Z., Podolyák, Zs, Oliver J. Roberts, Sakurai, H., Schaffner, H., Shand, C. M., Suzuki, H., Takeda, H., Terashima, S., Vajta, Zs, Valiente-Dòbon, J. J., and Xu, Z. Y.

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