12 results on '"PHONG, V. H."'
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2. Shape coexistence revealed in the N= Z isotope 72 Kr through inelastic scattering
- Author
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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
3. Studying the exotic decay 70Kr → 70Br
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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
4. Observation of a μs isomer in ¹³⁴₄₉In₈₅ : Proton-neutron coupling 'southeast' of ¹³²₅₀Sn₈₂
- Author
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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
5. Segmented YSO scintillation detectors as a new ${\rm ��}$-implant detection tool for decay spectroscopy in fragmentation facilities
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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.
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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
- Full Text
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6. The ORNL Analysis Technique for Extracting $��$-Delayed Multi-Neutron Branching Ratios with BRIKEN
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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
Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Instrumentation and Detectors (physics.ins-det) ,Nuclear Experiment (nucl-ex) ,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 $��$-decay delayed single and multi-neutron emission branching fractions. We describe assumptions about the decay model, background, and other parameters and their influence on $��$-decay delayed multi-neutron emission analysis. An analysis technique, the ORNL BRIKEN analysis procedure, for determining $��$-delayed multi-neutron branching ratios in $��$-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 $��$ trigger. The technique allows one to extract $��$-delayed multi-neutron decay branching ratios measured with the hybrid \textsuperscript{3}He BRIKEN neutron counter. As an example, two analyses of the $��$-neutron emitter \textsuperscript{77}Cu based on different {\it a priori} assumptions are presented along with comparisons to literature values., 21 pages, 10 figures
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- 2018
- Full Text
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7. Simultaneous investigation of the $\mathbf{T=1~ (J^{\pi}=0^+)}$ and $\mathbf{T=0 ~ (J^{\pi}=9^+)}$ $\beta$ decays in $^{70}$Br
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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., Yagi, S., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Experiment - Abstract
International audience; 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.
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- 2017
- Full Text
- View/download PDF
8. Simultaneous investigation of the $\mathbf{T=1~ (J^��=0^+)}$ and $\mathbf{T=0 ~ (J^��=9^+)}$ $��$ decays in $^{70}$Br
- Author
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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., Dombr��di, Zs., Doornenbal, P., Eberth, J., de France, G., Fujita, Y., Fukuda, N., Ganioglu, E., Gelletly, W., Gerbaux, M., Gr��vy, S., Guadilla, V., Inabe, N., Isobe, T., Korten, W., Kubo, T., Kubono, S., Nieto, T. Kurtuki��n, Lenzi, S., Lubos, D., Magron, C., Montaner-Piz��, A., Napoli, D. R., Sakurai, H., Shimizu, Y., Sidong, C., S��derstr��m, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Takei, Y., Tanaka, M., and Yagi, S.
- Subjects
FOS: Physical sciences ,Nuclear Experiment (nucl-ex) - Abstract
The $��$ 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 $T=0$ ($J^��=9^+$) and $T=1$ ($J^��=0^+$) 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 $J^��=9^+$ isomer from $��$-ray time decay analysis. Based on this result, we provide a new value of the half-life for the $J^��=0^+$ 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 $��$-ray transitions at 661, 1103, 1561, and 1749 keV following the $��$ decay of the $J^��=9^+$ 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 $J^��=(6^+)$ 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
- Full Text
- View/download PDF
9. Simultaneous investigation of the T=1(J=0+) and T=0(J=9+) gamma decays in Br 70
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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.
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Nuclear and High Energy Physics - Published
- 2017
10. Conceptual design of the BRIKEN detector: A hybrid neutron-gamma detection system for nuclear physics at the RIB facility of RIKEN
- Author
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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
11. β decay of the very neutron-deficient Ge 60 and Ge 62 nuclei
- Author
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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.
- Full Text
- View/download PDF
12. Collective and single-particle structures in the neutron-rich doubly mid-shell nucleus dy
- Author
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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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