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2. 7Be and 8B reaction dynamics at Coulomb barrier energies

Author

Strano E., Mazzocco M., Boiano A., Boiano C., La Commara M., Manea C., Parascandolo C., Pierroutsakou D., Signorini C., Torresi D., Yamaguchi H., Kahl D., Acosta L., Di Meo P., Fernandez-Garcia J.P., Glodariu T., Grebosz J., Guglielmetti A., Imai N., Hirayama Y., Ishiyama H., Iwasa N., Jeong S.C., Jia H.M., Keeley N., Kim Y.H., Kimura S., Kubono S., Lay J.A., Lin C.J., Marquinez-Duran G., Marte I., Miyatake H., Mukai M., Nakao T., Nicoletto M., Pakou A., Rusek K., Sakaguchi Y., Sanchez-Benitez A.M., Sava T., Sgouros O., Stefanini C., Soramel F., Soukeras V., Stiliaris E., Stroe L., Teranishi T., Toniolo N., Wakabayashi Y., Watanabe Y.X., Yang L., and Yang Y.Y.

Subjects
Physics, QC1-999
Abstract

We investigated the reaction dynamics induced by the 7Be,8B+208Pb collisions at energies around the Coulomb barrier. Charged particles originated by both the col- lisions were detected by means of 6 ΔE-Eres telescopes of a newly developed detector array. Experimental data were analysed within the framework of the Optical Model and the total reaction cross-sections were compared together and with the 6,7Li+208Pb colli-sion data. According to the preliminary results, 7Be nucleus reactivity is rather similar to the 7Li one whereas the 8B+208Pb total reaction cross section appears to be much larger than those measured for reactions induced by the other weakly-bound projectiles on the same target.

Published
2018
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3. Isomeric 26Al beam production with CRIB

Author

Shimizu H., Kahl D., Yamaguchi H., Abe K., Beliuskina O., Cha S. M., Chae K. Y., Chen A. A., Ge Z., Hayakawa S., Imai N., Iwasa N., Kim A., Kim D. H., Kim M. J., Kubono S., Kawag M. S., Liang J., Moon J. Y., Nishimura S., Oka S., Park S. Y., Psaltis A., Teranishi T., Ueno Y., and Yang L.

Subjects
Physics, QC1-999
Abstract

We performed an experiment to measure proton resonant elastic scattering of a mixed 26m,gAl beam with a thick target in inverse kinematics by using CNS RI beam sep-arator, located at RIKEN Nishina Center. It aimed to search for strong proton resonances and determine level properties of low spin-parity states in 27Si. Diagnosis of the 26mAl purity of the beam by annihilation radiation are discussed.

Published
2018
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4. Isomer beam elastic scattering: 26mAl(p, p) for astrophysics

Author

Kahl D., Shimizu H., Yamaguchi H., Abe K., Beliuskina O., Cha S. M., Chae K. Y., Chen A. A., Ge Z., Hayakawa S., Imai N., Iwasa N., Kim A., Kim D. H., Kim M. J., Kubono S., Kwag M. S., Liang J., Moon J. Y., Nishimura S., Oka S., Park S. Y., Psaltis A., Teranishi T., Ueno Y., and Yang L.

Subjects
Physics, QC1-999
Abstract

The advent of radioactive ground-state beams some three decades ago ultimately sparked a revolution in our understanding of nuclear physics. However, studies with radioactive isomer beams are sparse and have often required sophisticated apparatuses coupled with the technologies of ground-state beams due to typical mass differences on the order of hundreds of keV and vastly different lifetimes for isomers. We present an application of a isomeric beam of 26mAl to one of the most famous observables in nuclear astrophysics: galactic 26Al. The characteristic decay of 26Al in the Galaxy was the first such specific radioactivity to be observed originating from outside the Earth some four decades ago. We present a newly-developed, novel technique to probe the structure of low-spin states in 27Si. Using the Center for Nuclear Study low-energy radioisotope beam separator (CRIB), we report on the measurement of 26mAl proton resonant elastic scattering conducted with a thick target in inverse kinematics. The preliminary results of this on-going study are presented.

Published
2017
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5. 8B + 208Pb Elastic Scattering at Coulomb Barrier Energies

Author

Commara M. La, Mazzocco M., Boiano A., Boiano C., Manea C., Parascandolo C., Pierroutsakou D., Signorini C., Strano E., Torresi D., Yamaguchi H., Kahl D., Meo P. Di, Grebosz J., Imai N., Hirayama Y., Ishiyama H., Iwasa N., Jeong S.C., Jia H.M., Kim Y.H., Kimura S., Kubono S., Lin C.J., Miyatake H., Mukai M., Nakao T., Nicoletto M., Sakaguchi Y., Sánchez-Benítez A.M., Soramel F., Teranishi T., Wakabayashi Y., Watanabe Y.X., Yang L., and Yang Y.Y.

Subjects
Physics, QC1-999
Abstract

The scattering process of weakly-bound nuclei at Coulomb barrier energies provides deep insights on the reaction dynamics induced by exotic nuclei. Within this framework, we measured for the first time the scattering process of the short-lived Radioactive Ion Beam (RIB) 8B (S p = 0.1375 MeV) from a 208Pb target at 50 MeV beam energy. The 8B RIB was produced by means of the in-flight facility CRIB (RIKEN, Japan) with an average intensity on target of 10 kHz and a purity about 25%. Elastically scattering ions were detected in the angular range θc.m. = 10°-160° by means of the detector array EXPADES. A preliminary optical model analysis indicates a total reaction cross section of about 1 b, a value, once reduced, 2-3 times larger than those obtained for the reactions induced by the stable weakly-bound projectiles 6,7Li on a 208Pb target in the energy range around the Coulomb barrier.

Published
2017
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6. Nuclear astrophysics projects at the low-energy RI beam separator CRIB

Author

Yamaguchi H., Kahl D., Hayakawa S., Yang L., Shimizu H., Sakaguchi Y., Abe K., Nakao T., Suhara T., Iwasa N., Kim A., Kim D.H., Cha S.M., Kwag M.S., Lee J.H., Lee E.J., Chae K.Y., Wakabayashi Y., Imai N., Kitamura N., Lee P., Moon J.Y., Lee K.B., Akers C., Jung H.S., Duy N.N., Khiem L.H., Lee C.S., Hashimoto T., Kubono S., Kawabata T., Teranishi T., Kwon Y.K., and Binh D.N.

Subjects
Physics, QC1-999
Abstract

Studies on nuclear reactions relevant for astrophysics have been performed using the radioactive-isotope (RI) beams at the low-energy RI beam separator CRIB, operated by Center for Nuclear Study (CNS), the University of Tokyo. A type of measurement to study astrophysical reactions at CRIB is by the elastic resonant scattering with the thick-target method in inverse kinematics. We introduce the α resonant scattering with 7Be beam, related to the astrophysical 7Be(α, γ) reactions, which is relevant in the hot p-p chain and νp-process in supernovae. Other α resonant scattering measurements with 30S, 10Be, 15O, and 18Ne beams have been performed at CRIB, using the thick-target method.

Published
2017
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7. 7Be- and 8B-reaction dynamics at Coulomb barrier energies

Author

Mazzocco M., Boiano A., Boiano C., La Commara M., Manea C., Parascandolo C., Pierroutsakou D., Signorini C., Strano E., Torresi D., Yamaguchi H., Kahl D., Acosta L., Di Meo P., Fernandez-Garcia J.P., Glodariu T., Grebosz J., Guglielmetti A., Imai N., Hirayama Y., Ishiyama H., Iwasa N., Jeong S.C., Jia H.M., Keeley N., Kim Y.H., Kimura S., Kubono S., Lay J.A., Lin C.J., Marquinez-Duran G., Martel I., Miyatake H., Mukai M., Nakao T., Nicoletto M., Pakou A., Rusek K., Sakaguchi Y., Sánchez-Benítez A.M., Sava T., Sgouros O., Stefanini C., Soramel F., Soukeras V., Stiliaris E., Stroe L., Teranishi T., Toniolo N., Wakabayashi Y., Watanabe Y.X., Yang L., and Yang Y.Y.

Subjects
Physics, QC1-999
Abstract

We investigated the reaction dynamics induced by the Radioactive Ion Beams 7Be and 8B on a 208Pb target at energies around the Coulomb barrier. The two measurements are strongly interconnected, being 7Be (Sα = 1.586 MeV) the loosely bound core of the even more exotic 8B (Sp = 0.1375 MeV) nucleus. Here we summarize the present status of the data analysis for the measurement of the elastic scattering process for both reactions and the preliminary results for the optical model analysis of the collected data.

Published
2016
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8. Beta-decay spectroscopy of r-process nuclei around N = 126

Author

Hirayama Y., Miyatake H., Watanabe Y.X., Imai N., Ishiyama H., Jeong S.C., Jung H.S., Oyaizu M., Mukai M., Kimura S., Sonoda T., Wada M., Kim Y.H., Huyse M., Kudryavtsev Yu., and Van Duppen P.

Subjects
Physics, QC1-999
Abstract

KEK Isotope Separation System (KISS) has been developed at RIKEN to study the β-decay properties of neutron-rich isotopes with neutron numbers around N = 126 to understand the astrophysical site of r-process. These nuclei will be produced by multi-nucleon transfer reactions in neutron-rich heavy ion collisions between 136Xe beam and 198Pt target. The KISS consists of an argon gas cell combined with a laser resonance ionization technique for atomic number selection, of an ISOL mass-separation system and of a detector system for the β-decay spectroscopy of nuclei around N = 126. The argon gas cell of KISS is a key component for thermalizing (stopping and neutralizing) and accumulating the unstable nuclei, and selectively ionizing them by using laser. We have performed off-and on-line experiments to study the basic properties of the gas cell as well as KISS. We successfully extracted the laser-ionized stable 198Pt atoms from the KISS at the commissioning on-line experiments. We furthermore extracted laser-ionized unstable 199Pt atoms and confirmed that the measured half-life was in good agreement with the reported value. Now KISS is ready for lifetime measurements of Pt, Ir, and Os isotopes around N = 126.

Published
2016
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9. Study of the multi-nucleon transfer reactions of 136Xe + 198Pt for producing exotic heavy nuclei

Author

Kim Y. H., Watanabe Y. X., Hirayama Y., Imai N., Ishiyama H., Jeong S. C., Miyatake H., Choi S., Song J., Clement E., de France G., Navin A., Rejmund M., Schmitt C., Pollarolo G., Corradi L., Fioretto E., Montanari D., Niikura M., Suzuki D., Nishibata H., and Takatsu J.

Subjects
Physics, QC1-999
Abstract

The feasibility of the multi-nucleon transfer (MNT) reaction in the 136Xe +198Pt system was investigated for synthesizing neutron-rich heavy nuclei around mass number A∼200 of astrophysical interest. Identification of the projectile-like fragments (PLF’s) was successfully performed by using VAMOS++ spectrometer. The isotopic distributions of the PLF’s produced by two-proton stripping and pickup reactions were compared with each other, demonstrating the properties of the MNT reactions observed in the present system. The two-proton pickup channels strongly populated than the twoproton stripping channels were observed. The isotopic distributions for different total kinetic energy loss (TKEL) ranges are also discussed. The overall enhancement of the strength of the two-proton pickup compared with the two-proton stripping appears to be related to the MNT reactions with relatively moderate energy dissipation.

Published
2014
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10. Present Status of KEK Isotope Separation System

Author

Hirayama Y., Jeong S.C., Watanabe Y.X., Imai N., Ishiyama H., Miyatake H., Oyaizu M., Kim Y.H., Mukai M., Sonoda T., Wada M., Huyse M., Kudryavtsev Yu., and Van Duppen P.

Subjects
Physics, QC1-999
Abstract

KISS (KEK Isotope Separation System) has been constructed at Nishina Re-search Center (NRC) of RIKEN to study the decay properties of heavy neutron-rich iso-topes with mass number around A∼200 along the neutron magic number of N = 126 for the astrophysical interest. The isotopes of interest will be produced by multi-nucleon transfer reactions in neutron-rich heavy ion collisions (e.g. 136Xe projectile on 198Pt target). KISS consists of a gas-cell system for thermalizing (stopping and neutralizing) and fast-transporting reaction products to the gas cell exit hole, a laser system for the res-onant ionization, and a mass-separator system followed by a detection system for the decay spectroscopy. KISS will allow us to study unknown isotopes produced in weak re-action channels under low background conditions. The off-line test of the KISS has been finished. As a next step, on-line test experiments have been performed to investigate the overall efficiency and selectivity of the system as a function of the injected 56Fe beam intensity from the RIKEN Ring Cyclotron (RRC).

Published
2014
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14. Producing gold at ISOLDE-CERN

Author

Barzakh, A.E., Andreyev, A.N., Atanasov, D., Cubiss, J.G., Harding, R.D., Al Monthery, M., Althubiti, N.A., Andel, B., Antalic, S., Ballof, J., Blaum, K., Cocolios, T.E., Van Duppen, P., Day Goodacre, T., de Roubin, A., Duchemin, C., Farooq-Smith, G.J., Fedorov, D.V., Fedosseev, V.N., Fink, D.A., Gaffney, L.P., Ghys, L., Huyse, M., Imai, N., Johnson, J., Kreim, S., Lunney, D., Lynch, K.M., Manea, V., Marsh, B.A., Martinez Palenzuela, Y., Molkanov, P.L., Neidherr, D., Panteleev, V.N., Rosenbusch, M., Rossel, R.E., Rothe, S., Schweikhard, L., Seliverstov, M.D., Sels, S., Van Beveren, C., Verstraelen, E., Welker, A., Wienholtz, F., Wolf, R.N., and Zuber, K.

Published
2022
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15. New energy-degrading beamline for in-flight RI beams, OEDO

Author

Michimasa, S., Imai, N., Dozono, M., Hwang, J.W., Yamada, K., Ota, S., Yoshida, K., Yanagisawa, Y., Kusaka, K., Ohtake, M., Matsushita, M., Ahn, D.S., Beliuskina, O., Chiga, N., Chikaato, K., Fukuda, N., Hayakawa, S., Ideguchi, E., Iribe, K., Iwamoto, C., Kawase, S., Kawata, K., Kitamura, N., Masuoka, S., Miyatake, H., Nagae, D., Nakajima, R., Nakamura, T., Nakano, K., Omika, S., Otsu, H., Sakurai, H., Schrock, P., Shimizu, H., Shimizu, Y., Sumikama, T., Sun, X., Suzuki, D., Suzuki, H., Takaki, M., Takechi, M., Takeda, H., Takeuchi, S., Teranishi, T., Tsunoda, R., Wang, H., Watanabe, Y., Watanabe, Y.X., Wimmer, K., Yako, K., Yamaguchi, H., Yang, L., Yoshida, H., and Shimoura, S.

Published
2020
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16. Neutron capture reaction cross-section of 79Se through the 79Se(d,p) reaction in inverse kinematics

Author

Imai, N., Dozono, M., Michimasa, S., Sumikama, T., Ota, S., Hayakawa, S., Hwang, J.W., Iribe, K., Iwamoto, C., Kawase, S., Kawata, K., Kitamura, N., Masuoka, S., Nakano, K., Schrock, P., Suzuki, D., Tsunoda, R., Wimmer, K., Ahn, D.S., Beliuskina, O., Chiga, N., Fukuda, N., Ideguchi, E., Kusaka, K., Miki, H., Miyatake, H., Nagae, D., Ohmika, S., Ohtake, M., Ong, H.J., Otsu, H., Sakurai, H., Shimizu, H., Shimizu, Y., Sun, X., Suzuki, H., Takaki, M., Takeda, H., Takeuchi, S., Teranishi, T., Watanabe, Y., Watanabe, Y.X., Yako, K., Yamada, H., Yamaguchi, H., Yang, L., Yanagihara, R., Yanagisawa, Y., Yoshida, K., and Shimoura, S.

Published
2024
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20. Isospin symmetry in the T = 1,A = 62 triplet

Author

Wimmer, K., Ruotsalainen, P., Lenzi, S.M., Poves, A., Hüyük, T., Browne, F., Doornenbal, P., Koiwai, T., Arici, T., Auranen, K., Bentley, M.A., Cortés, M.L., Delafosse, C., Eronen, T., Ge, Z., Grahn, T., Greenlees, P.T., Illana, A., Imai, N., Joukainen, H., Julin, R., Jungclaus, A., Jutila, H., Kankainen, A., Kitamura, N., Longfellow, B., Louko, J., Lozeva, R., Luoma, M., Mauss, B., Napoli, D.R., Niikura, M., Ojala, J., Pakarinen, J., Pereira-Lopez, X., Rahkila, P., Recchia, F., Sandzelius, M., Sarén, J., Taniuchi, R., Tann, H., Uthayakumaar, S., Uusitalo, J., Vaquero, V., Wadsworth, R., Zimba, G., and Yajzey, R.

Published
2023
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21. Study of 19F Levels with Ex = 6.7 - 7.7 MeV by the 15N+α Scattering Experiment

Author

Kim, D., Kim, G. W., Park, S. Y., Kim, A., Hahn, K. I., Abe, K., Beliuskina, O., Hayakawa, S., Imai, N., Kitamura, N., Sakaguchi, Y., Yamaguchi, H., Cha, S. M., Chae, K. Y., Kwag, M. S., Hong, S. W., Lee, E. J., Lee, J. H., Lee, E. K., Moon, J. Y., Bae, S. H., Choi, S. H., Kubono, S., Panin, V., Wakabayashi, Y., Iwasa, N., Kahl, D., and Chen, A. A.

Published
2018
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25. Nuclear structure explored by β-delayed decay spectroscopy of spin-polarized radioactive nuclei at TRIUMF ISAC-1 : Intruder configurations in 29Mg and 30Mg, the nuclei in the region of island of inversion

Author

Shimoda, T., Tajiri, K., Kura, K., Odahara, A., Suga, M., Hirayama, Y., Imai, N., Miyatake, H., Pearson, M., Levy, C. D. P., Jackson, K. P., Legillon, R., Petrache, C., Fukuchi, T., Hamatani, N., Hori, T., Kazato, M., Kenmoku, Y., Masue, T., Nishibata, H., Suzuki, T., Takashima, A., Yokoyama, R., Dilling, Jens, editor, Krücken, Reiner, editor, and Merminga, Lia, editor

Published
2014
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28. Pulse-height defect in single-crystal CVD diamond detectors

Author

Beliuskina, O., Strekalovsky, A. O., Aleksandrov, A. A., Aleksandrova, I. A., Devaraja, H. M., Heinz, C., Heinz, S., Hofmann, S., Ilich, S., Imai, N., Kamanin, D. V., Kis, M., Knyazheva, G. N., Kozhuharov, C., Kuznetsova, E. A., Maurer, J., Mishinsky, G. V., Pomorski, M., Pyatkov, Yu. V., Strekalovsky, O. V., Träger, M., and Zhuchko, V. E.

Published
2017
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29. New developments of the in-source spectroscopy method at RILIS/ISOLDE

Author

Marsh, B.A., Andel, B., Andreyev, A.N., Antalic, S., Atanasov, D., Barzakh, A.E., Bastin, B., Borgmann, Ch., Capponi, L., Cocolios, T.E., Day Goodacre, T., Dehairs, M., Derkx, X., De Witte, H., Fedorov, D.V., Fedosseev, V.N., Focker, G.J., Fink, D.A., Flanagan, K.T., Franchoo, S., Ghys, L., Huyse, M., Imai, N., Kalaninova, Z., Köster, U., Kreim, S., Kesteloot, N., Kudryavtsev, Yu., Lane, J., Lecesne, N., Liberati, V., Lunney, D., Lynch, K.M., Manea, V., Molkanov, P.L., Nicol, T., Pauwels, D., Popescu, L., Radulov, D., Rapisarda, E., Rosenbusch, M., Rossel, R.E., Rothe, S., Schweikhard, L., Seliverstov, M.D., Sels, S., Sjödin, A.M., Truesdale, V., Van Beveren, C., Van Duppen, P., Wendt, K., Wienholtz, F., Wolf, R.N., and Zemlyanoy, S.G.

Published
2013
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30. Tilted foils polarization at REX-ISOLDE

Author

Törnqvist, H., Sotty, C., Balabanski, D., Dhal, A., Georgiev, G., Hass, M., Heinz, A., Hirayama, Y., Imai, N., Johansson, H., Kowalska, M., Kusoglu, A., Nilsson, T., Stuchbery, A., Wenander, F., and Yordanov, D.T.

Published
2013
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32. First application of the Laser Ion Source and Trap (LIST) for on-line experiments at ISOLDE

Author

Fink, D.A., Richter, S.D., Bastin, B., Blaum, K., Catherall, R., Cocolios, T.E., Fedorov, D.V., Fedosseev, V.N., Flanagan, K.T., Ghys, L., Gottberg, A., Imai, N., Kron, T., Lecesne, N., Lynch, K.M., Marsh, B.A., Mendonca, T.M., Pauwels, D., Rapisarda, E., Ramos, J.P., Rossel, R.E., Rothe, S., Seliverstov, M.D., Sjödin, M., Stora, T., Van Beveren, C., and Wendt, K.D.A.

Published
2013
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33. Study of collisions of 136Xe + 198Pt for the KEK isotope separator

Author

Watanabe, Y.X., Hirayama, Y., Imai, N., Ishiyama, H., Jeong, S.C., Miyatake, H., Clement, E., de France, G., Navin, A., Rejmund, M., Schmitt, C., Pollarolo, G., Corradi, L., Fioretto, E., Montanari, D., Choi, S.H., Kim, Y.H., Song, J.S., Niikura, M., Suzuki, D., Nishibata, H., and Takatsu, J.

Published
2013
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35. In-beam $\gamma$-ray spectroscopy of $^{32}$Mg via direct reactions

Author

Kitamura, N., Wimmer, K., Miyagi, T., Poves, A., Shimizu, N., Tostevin, J. A., Bader, V. M., Bancroft, C., Barofsky, D., Baugher, T., Bazin, D., Berryman, J. S., Bildstein, V., Gade, A., Imai, N., Kröll, T., Langer, C., Lloyd, J., Lunderberg, E., Nowacki, F., Perdikakis, G., Recchia, F., Redpath, T., Saenz, S., Smalley, D., Stroberg, S. R., Utsuno, Y., Weisshaar, D., and Westerberg, A.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Background: The nucleus $^{32}$Mg ($N=20$ and $Z=12$) plays a central role in the so-called "island of inversion" where in the ground states $sd$-shell neutrons are promoted to the $fp$-shell orbitals across the shell gap, resulting in the disappearance of the canonical neutron magic number $N=20$. Purpose: The primary goals of this work are to extend the level scheme of $^{32}$Mg, provide spin-parity assignments to excited states, and discuss the microscopic structure of each state through comparisons with theoretical calculations. Method: In-beam $\gamma$-ray spectroscopy of $^{32}$Mg was performed using two direct-reaction probes, one-neutron (two-proton) knockout reactions on $^{33}$Mg ($^{34}$Si). Final-state exclusive cross sections and parallel momentum distributions were extracted from the experimental data and compared with eikonal-based reaction model calculations combined with shell-model overlap functions. Results: Owing to the remarkable selectivity of the one-neutron and two-proton knockout reactions, a significantly updated level scheme for $^{32}$Mg, which exhibits negative-parity intruder and positive-parity normal states, was constructed. The experimental results were confronted with four different nuclear structure models. Conclusions: In some of these models, different aspects of $^{32}$Mg and the transition into the island of inversion are well described. However, unexplained discrepancies remain, and even with the help of these state-of-the-art theoretical approaches, the structure of this key nucleus is not yet fully captured.

Published
2022

37. Mirror energy differences above the 0f7/2 shell: First γ-ray spectroscopy of the Tz = −2 nucleus 56Zn

Author

Fernández, A., Jungclaus, A., Doornenbal, P., Bentley, M.A., Lenzi, S.M., Rudolph, D., Browne, F., Cortés, M.L., Koiwai, T., Taniuchi, R., Vaquero, V., Wimmer, K., Arici, T., Imai, N., Kitamura, N., Longfellow, B., Lozeva, R., Mauss, B., Napoli, D.R., Niikura, M., Pereira-Lopez, X., Pigliapoco, S., Poves, A., Recchia, F., Ruotsalainen, P., Sakurai, H., Uthayakumaar, S., Wadsworth, R., and Yajzey, R.

Published
2021
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38. Mirror energy differences above the 0 shell: First -ray Spectroscopy of the = −2 Nucleus Zn

Author

Fernández, A., Jungclaus, A., Doornenbal, P., Bentley, M.A., Lenzi, S.M., Rudolph, D., Browne, F., Cortés, M.L., Koiwai, T., Taniuchi, R., Vaquero, V., Wimmer, K., Arici, T., Imai, N., Kitamura, N., Longfellow, B., Lozeva, R., Mauss, B., Napoli, D.R., Niikura, M., Pereira-Lopez, X., Pigliapoco, S., Poves, A., Recchia, F., Ruotsalainen, P., Sakurai, H., Uthayakumaar, S., Wadsworth, R., and Yajzey, R.

Abstract

Excited states in $^{56}$Zn were populated following one-neutron removal from a $^{57}$Zn beam impinging on a Be target at intermediate energies in an experiment conducted at the Radioactive Isotope Beam Factory at RIKEN. Three γ rays were observed and tentatively assigned to the 6+→4+→2+→0+ yrast sequence. This turns $^{56}$Zn into the heaviest Tz=−2 nucleus in which excited states are known. The excitation-energy differences between these levels and the isobaric analogue states in the Tz=+2 mirror partner, $^{56}$Fe, are compared with large-scale shell-model calculations considering the full pf valence space and various isospin-breaking contributions. This comparison, together with an analysis of the mirror energy differences in the A=58, Tz=±1 pair $^{58}$Zn and $^{58}$Ni, provides valuable information with respect to the size of the monopole radial and the isovector multipole isospin-breaking terms in the region above doubly-magic $^{56}$Ni.

Published
2021

39. Coexisting normal and intruder configurations in Mg

Author

Kitamura, N., Wimmer, K., Poves, A., Shimizu, N., Tostevin, J.A., Bader, V.M., Bancroft, C., Barofsky, D., Baugher, T., Bazin, D., Berryman, J.S., Bildstein, V., Gade, A., Imai, N., Kröll, T., Langer, C., Lloyd, J., Lunderberg, E., Nowacki, F., Perdikakis, G., Recchia, F., Redpath, T., Saenz, S., Smalley, D., Stroberg, S.R., Utsuno, Y., Weisshaar, D., and Westerberg, A.

Abstract

Situated in the so-called “island of inversion,” the nucleus $^{32}$Mg is considered as an archetypal example of the disappearance of magicity at N=20. We report on high statistics in-beam spectroscopy of $^{32}$Mg with a unique approach, in that two direct reaction probes with different sensitivities to the underlying nuclear structure are employed at the same time. More specifically, states in $^{32}$Mg were populated by knockout reactions starting from $^{33}$Mg and $^{34}$Si, lying inside and outside the island of inversion, respectively. The momentum distributions of the reaction residues and the cross sections leading to the individual final states were confronted with eikonal-based reaction calculations, yielding a significantly updated level scheme for $^{32}$Mg and spin-parity assignments. By fully exploiting observables obtained in this measurement, a variety of structures coexisting in $^{32}$Mg was unraveled. Comparisons with theoretical predictions based on shell-model overlaps allowed for clear discrimination between different structural models, revealing that the complete theoretical description of this key nucleus is yet to be achieved.

Published
2021

40. Nuclear structure study of 254Es via Coulomb excitation gamma ray spectroscopy

Author

Pham, T.T., Ideguchi, E., Aoi, N., Kohda, A., Orlandi, R., Nishio, K., Makii, H., Asai, M., Suzaki, F., Hirose, K., Sato, T.K., Tsukada, K., Ito, Y., Toshiyuki, Shizuma, Fang, Y., M. Kumar Raju, J-G., Wang, Guo, S., M. Liu, Zhou, X., Imai, N., Kitamura, N., Michimasa, S., Toh, Y., Rykaczewski, K.P., Ezold, J., Cleve, S., Roberto, J.B., Boll, R.A., Go, S., Tanaka, M., and Andreyev, A.

Subjects
Physics::Instrumentation and Detectors
Abstract

The study of 254Es via Coulomb excitation gamma-ray spectroscopy has been performed at the JAEA-Tokai Tandem Laboratory using a 58Ni beam with an energy of 250 MeV. The detector system includes: 4 single-crystal HPGe detectors, 4 LaBr3(Ce) scintillators and 4 Clover type HPGe detectors and 2 CD silicon detectors placed backward and forward to the target for detecting scattered particle. A “safe” Coulomb excitation of 254Es was achieved for the first time to study its excited states. The 254Es gamma-ray spectrum was investigated by gating on the scattered 58Ni particle measured by the CD Si detectors. The gamma spectrum created after gain matching and Doppler shift correction was analyzed. From the gamma spectrum, several new transitions of 254Es were observed and they indicated the rotational band structure. The extracted data could help to extend the 254Es level scheme and determine its quadrupole deformation., 日本物理学会２０２１年秋季大会

Published
2021

42. EP08.41: Fetal adrenal grand: zone‐targeting dimensional measurement and Doppler studies in normal and growth‐restricted fetuses.

Author

Miyashita, S., Enju, M., Kudo, R., Imai, N., and Murotsuki, J.

Subjects
GESTATIONAL age, ULTRASONIC imaging, ADRENAL glands, ARTERIES, FETUS
Abstract

This article, titled "EP08.41: Fetal adrenal grand: zone-targeting dimensional measurement and Doppler studies in normal and growth-restricted fetuses," explores the zonal structure of the fetal adrenal gland and the identification of plural adrenal arteries using ultrasound imaging. The study analyzed normal and growth-restricted fetuses without structural anomalies and measured the outer diameter of the low echoic definitive zone (DZ) and echo genic fetal zone (FZ) three-dimensionally. The researchers also examined the relationship between gestational age and the FZ/DZ ratio, as well as the pulsatile Doppler recording on adrenal arteries. The results showed that the zonal dimension and Doppler measurement of the fetal adrenal gland were technically accessible, and the changes in the FZ/DZ ratio and MAA-PI (middle adrenal artery pulsatility index) suggested functional maturation of the gland. The study found no significant difference between the normal and growth-restricted fetuses. [Extracted from the article]

Published
2024
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43. OP08.06: Fetal hemodynamic change after aspiration/thoraco‐amniotic shunting for fetal hydrothorax: conventional Doppler and ultrasonic phased‐tracking study.

Author

Miyashita, S., Enju, M., Kudo, R., Imai, N., and Murotsuki, J.

Subjects
DOPPLER ultrasonography, PULSE wave analysis, CARDIAC output, CORD blood, ELASTIC waves
Abstract

This article, titled "Fetal hemodynamic change after aspiration/thoraco-amniotic shunting for fetal hydrothorax: conventional Doppler and ultrasonic phased-tracking study," examines the effects of fetal therapies for hydrothorax on fetal hemodynamics. The study analyzes measurements such as pulse wave velocity (PWV) and estimated pulse pressure (ePP) using the ultrasonic phased-tracking method (PTM). The results show that PWV and ePP decreased after aspiration of effusion (ASP) and thoraco-amniotic shunting (TAS), indicating a decrease in fetal blood pressure. The study suggests that hypovolemia caused by rapid drainage of effusion may be the main factor for the decrease in PWV and ePP. [Extracted from the article]

Published
2024
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45. Laser-assisted nuclear decay spectroscopy of Au-176,Au-177,Au-179

Author

Harding, RD, Andreyev, AN, Barzakh, AE, Cubiss, JG, Van Duppen, P, Al Monthery, M, Althubiti, NA, Andel, B, Antalic, S, Cocolios, TE, Goodacre, T Day, Dockx, K, Farooq-Smith, GJ, Fedorov, D, Fedosseev, VN, Fink, DA, Gaffney, LP, Ghys, L, Johnson, JD, Joss, DT, Huyse, M, Imai, N, Lynch, KM, Marsh, BA, Palenzuela, Y Martinez, Molkanov, PL, O'Neill, GG, Page, RD, Rossel, RE, Rothe, S, Seliverstov, MD, Sels, S, Van Beveren, C, and Verstraelen, E

Subjects
ENERGY, Science & Technology, Physics, Nuclear, LIGHT, STATES, SHAPE COEXISTENCE, MOMENTS, Physics, Physical Sciences, ISOTOPES, GOLD, DATA SHEETS
Abstract

ispartof: PHYSICAL REVIEW C vol:104 issue:2 status: published

Published
2021

46. Coexisting normal and intruder configurations in 32Mg

Author

Kitamura, N., Wimmer, K., Poves, A., Shimizu, N., Tostevin, J.A., Bader, V.M., Bancroft, C., Barofsky, D., Baugher, T., Bazin, D., Berryman, J.S., Bildstein, V., Gade, A., Imai, N., Kröll, T., Langer, C., Lloyd, J., Lunderberg, E., Nowacki, F., Perdikakis, G., Recchia, F., Redpath, T., Saenz, S., Smalley, D., Stroberg, S.R., Utsuno, Y., Weisshaar, D., and Westerberg, A.

Published
2021
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48. Author Correction: Suppression of a SARS-CoV-2 outbreak in the Italian municipality of Vo’ (Nature, (2020), 584, 7821, (425-429), 10.1038/s41586-020-2488-1)

Author

Lavezzo, E., Franchin, E., Ciavarella, C., Cuomo-Dannenburg, G., Barzon, L., Del Vecchio, C., Rossi, L., Manganelli, R., Loregian, A., Navarin, N., Abate, D., Sciro, M., Merigliano, S., De Canale, E., Vanuzzo, M. C., Besutti, V., Saluzzo, F., Onelia, F., Pacenti, M., Parisi, S. G., Carretta, G., Donato, D., Flor, L., Cocchio, S., Masi, G., Sperduti, A., Cattarino, L., Salvador, R., Nicoletti, M., Caldart, F., Castelli, G., Nieddu, E., Labella, B., Fava, L., Drigo, M., Gaythorpe, K. A. M., Ainslie, K. E. C., Baguelin, M., Bhatt, S., Boonyasiri, A., Boyd, O., Coupland, H. L., Cucunuba, Z., Djafaara, B. A., van Elsland, S. L., Fitzjohn, R., Flaxman, S., Green, W. D., Hallett, T., Hamlet, A., Haw, D., Imai, N., Jeffrey, B., Knock, E., Laydon, D. J., Mellan, T., Mishra, S., Nedjati-Gilani, G., Nouvellet, P., Okell, L. C., Parag, K. V., Riley, S., Thompson, H. A., Unwin, H. J. T., Verity, R., Vollmer, M. A. C., Walker, P. G. T., Walters, C. E., Wang, H., Wang, Y., Watson, O. J., Whittaker, C., Whittles, L. K., Xi, X., Brazzale, A. R., Toppo, S., Trevisan, M., Baldo, V., Donnelly, C. A., Ferguson, N. M., Dorigatti, I., and Crisanti, A.

Published
2021

49. Laser-assisted nuclear decay spectroscopy of $^{176,177,179}$Au

Author

Harding, R. D., Andreyev, A. N., Barzakh, A. E., Cubiss, J. G., Van Duppen, P., Al Monthery, M., Althubiti, N. A., Andel, B., Antalic, S., Cocolios, T. E., Goodacre, T. Day, Dockx, K., Farooq-Smith, G. J., Fedorov, D. V., Fedosseev, V. N., Fink, D. A., Gaffney, L. P., Ghys, L., Johnson, J. D., Joss, D. T., Huyse, M., Imai, N., Lynch, K. M., Marsh, B. A., Martinez Palenzuela, Y., Molkanov, P. L., O'Neill, G. G., Page, R. D., Rossel, R. E., Rothe, S., Seliverstov, M. D., Sels, S., Van Beveren, C., and Verstraelen, E.

Subjects
Nuclear Physics - Experiment, Physics::Atomic Physics, Nuclear Experiment
Abstract

A study of the laser-ionized and mass-separated neutron-deficient isotopes $^{176,177,179}$Au was performed using the Resonance Ionization Laser Ion Source and the Windmill detection setup at ISOLDE, CERN. New and improved data on complex fine-structure α decays of the three isotopes were deduced, providing insight into the low-lying levels in the daughter nuclei $^{172,173,175}$Ir. New information on the properties of β-decay daughter products $^{177,179}$Pt was also obtained. From the first in-source laser spectroscopy measurements of the hyperfine structure in the atomic 267.6-nm transition of 176Au, the nuclear magnetic moments for both high- and low-spin α-decaying states were deduced. Together with the values determined from the additivity relations, they were used to propose the most probable spins and configurations for both states. The α-decay branching ratios were determined as $b_{\alpha}$ $\left (^{176}\textrm{Au}^{ls}\right)=58(5)$% and $b_{\alpha}$ $(^{176} \textrm{Au}^{hs})=29(5)$%.

Published
2021

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