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134 results on '"Tshoo, K."'

2. Production cross sections and angular distributions of neutron-rich rare isotopes from 15 MeV/nucleon Kr-induced collisions: toward the r-process path

Author

Fasoula, O., Souliotis, G. A., Kwon, Y. K., Tshoo, K., Veselsky, M., Yennello, S. J., and Bonasera, A.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

We present our recent study of cross sections and angular distributions of projectile fragments from heavy-ion reactions at beam energy of 15 MeV/nucleon. We studied the production cross sections and the angular distributions of neutron-rich nuclides from collisions of a 86 Kr (15 MeV/nucleon) beam with heavy targets ( 64 Ni, 124 Sn and 238 U). Experimental data from our previous work at Texas A & M were compared with model calculations. Our calculations were based on a two-step approach: the dynamical stage of the collision was described with, first, the phenomenological Deep-Inelastic Transfer model (DIT) and, alternatively, with the microscopic Constrained Molecular Dynamics model (CoMD). The de-excitation of the hot heavy projectile fragments was performed with the Statistical Multifragmentation Model (SMM). An overall good discription of the available data was obtained with the models employed. Furthermore, we performed calculations with a radioactive beam of 92 Kr (15 MeV/nucleon) interacting with a target of 238 U. We observed that the multinucleon transfer mechanism leads to extremely neutron-rich nuclides toward and beyond the astrophysical r-process path., Comment: 15 pages, 8 figures

Published
2021

3. $\beta$-Decay Half-Lives of 55 Neutron-Rich Isotopes beyond the N=82 Shell Gap

Author

Wu, J., Nishimura, S., Möller, P., Mumpower, M. R., Lozeva, R., Moon, C. B., Odahara, A., Baba, H., Browne, F., Daido, R., Doornenbal, P., Fang, Y. F., Haroon, M., Isobe, T., Jung, H. S., Lorusso, G., Moon, B., Patel, Z., Rice, S., Sakurai, H., Shimizu, Y., Sinclair, L., Söderström, P. -A., Sumikama, T., Watanabe, H., Xu, Z. Y., Yagi, A., Yokoyama, R., Ahn, D. S., Garrote, F. L. Bello, Daugas, J. M., Didierjean, F., Fukuda, N., Inabe, N., Ishigaki, T., Kameda, D., Kojouharov, I., Komatsubara, T., Kubo, T., Kurz, N., Kwon, K. Y., Morimoto, S., Murai, D., Nishibata, H., Schaffner, H., Sprouse, T. M., Suzuki, H., Takeda, H., Tanaka, M., Tshoo, K., and Wakabayashi, Y.

Subjects
Nuclear Experiment
Abstract

The $\beta$-decay half-lives of 55 neutron-rich nuclei $^{134-139}$Sn, $^{134-142}$Sb, $^{137-144}$Te, $^{140-146}$I, $^{142-148}$Xe, $^{145-151}$Cs, $^{148-153}$Ba, $^{151-155}$La were measured at the Radioactive Isotope Beam Factory (RIBF) employing the projectile fission fragments of $^{238}$U. The nuclear level structure, which relates to deformation, has a large effect on the half-lives. The impact of newly-measured half-lives on modeling the astrophysical origin of the heavy elements is studied in the context of $r$ process nucleosynthesis. For a wide variety of astrophysical conditions, including those in which fission recycling occurs, the half-lives have an important local impact on the second ($A$ $\approx$ 130) peak.

Published
2020
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4. Overview of nuclear data production system at RAON

Author

Ham, C., Tshoo, K., Lee, S., Pyeun, S.J., Lee, K.B., Akers, C., Kim, M., Kim, J.C., Kwag, M.S., Kwak, D., Kim, D.G., Choi, Y.J., Lim, E.H., Kwon, J.W., Kim, G.D., Woo, H.J., Yang, S.-C., Song, T.-Y., Gil, C.-S., Kim, D.H., Lee, Y.-O., Moon, D.H., Hong, S.W., Moon, S.H., Jeong, J., Chung, M., Shin, T., and Kwon, M.

Published
2023
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10. Neutron-rich rare isotope production with stable and radioactive beams in the mass range A=40-60 at beam energy around 15 MeV/nucleon

Author

Papageorgiou, A., Souliotis, G. A., Tshoo, K., Jeong, S. C., Kang, B. H., Kwon, Y. K., Veselsky, M., Yennello, S. J., and Bonasera, A.

Subjects
Nuclear Experiment
Abstract

We studied the production of neutron-rich nuclides in multinucleon transfer collisions of stable and radioactive beams in the mass range A=40-60. We first presented our experimental cross section data of projectile fragments from the reaction of 40Ar(15 MeV/nucleon) with 64Ni, 58Ni and 27Al. We then compared them with calculations based on either the deep-inelastic transfer (DIT) model or the constrained molecular dynamics (CoMD) model, followed by the statistical multifragmentation model (SMM). An overall good agreement of the calculations with the experimental data is obtained. We continued with calculations of the reaction of 40Ar (15 MeV/nucleon) with 238U target and then with reactions of 48Ca (15 MeV/nucleon) with 64Ni and 238U targets. In these reactions, neutron-rich rare isotopes with large cross sections are produced. These nuclides, in turn, can be assumed to form radioactive beams and interact with a subsequent target (preferably 238U), leading to the production of extremely neutron-rich and even new isotopes (e.g. 60Ca) in this mass range. We conclude that multinucleon transfer reactions with stable or radioactive beams at the energy of around 15 MeV/nucleon offer an effective route to access extremely neutron-rich rare isotopes for nuclear structure or reaction studies., Comment: 28 pages, 11 figures

Published
2018
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11. Neutron-rich rare isotope production from projectile fission of heavy beams in the energy range of 20 MeV/nucleon

Author

Vonta, N., Souliotis, G. A., Loveland, W. D., Kwon, Y. K., Tshoo, K., Jeong, S. C., Veselsky, M., Bonasera, A., and Botvina, A.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

We investigate the possibilities of producing neutron-rich nuclides in projectile fission of heavy beams in the energy range of 20 MeV/nucleon expected from low-energy facilities. We report our efforts to theoretically describe the reaction mechanism of projectile fission following a multinucleon transfer collision at this energy range. Our calculations are mainly based on a two-step approach: the dynamical stage of the collision is described with either the phenomenological Deep-Inelastic Transfer model (DIT), or with the microscopic Constrained Molecular Dynamics model (CoMD). The deexcitation/fission of the hot heavy projectile fragments is performed with the Statistical Mul- tifragmentation Model (SMM). We compared our model calculations with our previous experimental projectile-fission data of 238U (20 MeV/nucleon)+208Pb and 197Au (20 MeV/nucleon)+197Au and found an overall reasonable agreement. Our study suggests that projectile fission following periph- eral heavy-ion collisions at this energy range offers an effective route to access very neutron-rich rare isotopes toward and beyond the astrophysical r-process path.

Published
2016
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12. Nuclear structure of 140Te with N = 88: Structural symmetry and asymmetry in Te isotopes with respect to the double-shell closure Z = 50 and N = 82

Author

Moon, C. -B., Lee, P., Lee, C. S., Odahara, A., Lozeva, R., Yagi, A., Browne, F., Nishimura, S., Doornenbal, P., Lorusso, G., Söderström, P. -A., Sumikama, T., Watanabe, H., Isobe, T., Baba, H., Sakurai, H., Daido, R., Fang, Y., Nishibata, H., Patel, Z., Rice, S., Sinclair, L., Wu, J., Xu, Z. Y., Yokoyama, R., Kubo, T., Inabe, N., Suzuki, H., Fukuda, N., Kameda, D., Takeda, H., Ahn, D. S., Murai, D., Garrote, F. L. Bello, Daugas, J. M., Didierjean, F., Ideguchi, E., Ishigaki, T., Jung, H. S., Komatsubara, T., Kwon, Y. K., Morimoto, S., Niikura, M., Nishizuka, I., and Tshoo, K.

Subjects
Nuclear Experiment
Abstract

We study for the first time the internal structure of 140Te through the beta-delayed gamma-ray spectroscopy of 140Sb. The very neutron-rich 140Sb, Z = 51 and N = 89, ions were produced by the in-flight fission of 238U beam on a 9Be target at 345 MeV per nucleon at the Radioactive Ion Beam Factory, RIKEN. The half-life and spin-parity of 140Sb are reported as 124(30) ms and (4-), respectively. In addition to the excited states of 140Te produced by the beta-decay branch, the beta-delayed one-neutron and two-neutron emission branches were also established. By identifying the first 2+ and 4+ excited states of 140Te, we found that Te isotopes persist their vibrator character with E(4+)/E(2+) = 2. We discuss the distinctive features manifest in this region, such as valence neutron symmetry and asymmetry, revealed in pairs of isotopes with the same neutron holes and particles with respect to N = 82., Comment: 9 pages, 6 figures, EURICA campaign

Published
2015
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13. Observation of the Exotic 02+ Cluster State in He8

Author

Yang, Z. H., primary, Ye, Y. L., additional, Zhou, B., additional, Baba, H., additional, Chen, R. J., additional, Ge, Y. C., additional, Hu, B. S., additional, Hua, H., additional, Jiang, D. X., additional, Kimura, M., additional, Li, C., additional, Li, K. A., additional, Li, J. G., additional, Li, Q. T., additional, Li, X. Q., additional, Li, Z. H., additional, Lou, J. L., additional, Nishimura, M., additional, Otsu, H., additional, Pang, D. Y., additional, Pu, W. L., additional, Qiao, R., additional, Sakaguchi, S., additional, Sakurai, H., additional, Satou, Y., additional, Togano, Y., additional, Tshoo, K., additional, Wang, H., additional, Wang, S., additional, Wei, K., additional, Xiao, J., additional, Xu, F. R., additional, Yang, X. F., additional, Yoneda, K., additional, You, H. B., additional, and Zheng, T., additional

Published
2023
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14. Neutron occupancy of the 0d5/2 orbital and the N=16 shell closure in 24O

Author

Tshoo, K., Satou, Y., Bertulani, C. A., Bhang, H., Choi, S., Nakamura, T., Kondo, Y., Deguchi, S., Kawada, Y., Nakayama, Y., Tanaka, K. N., Tanaka, N., Togano, Y., Kobayashi, N., Aoi, N., Ishihara, M., Motobayashi, T., Otsu, H., Sakurai, H., Takeuchi, S., Yoneda, K., Delaunay, F., Gibelin, J., Marqués, F. M., Orr, N. A., Honda, T., Kobayashi, T., Sumikama, T., Miyashita, Y., Yoshinaga, K., Matsushita, M., Shimoura, S., Sohler, D., Hwang, J. W., Zheng, T., Li, Z. H., and Cao, Z. X.

Subjects
Nuclear Experiment
Abstract

One-neutron knockout from 24O leading to the first excited state in 23O has been measured for a proton target at a beam energy of 62 MeV/nucleon. The decay energy spectrum of the neutron unbound state of 23O was reconstructed from the measured four momenta of the 22O fragment and emitted neutron. A sharp peak was found at Edecay=50$\pm$3 keV, corresponding to an excited state in 23O at 2.78$\pm$0.11 MeV, as observed in previous measurements. The longitudinal momentum distribution for this state was consistent with d -wave neutron knockout, providing support for a J{\pi} assignment of 5/2+. The associated spectroscopic factor was deduced to be C2S(0d5/2)=4.1$\pm$0.4 by comparing the measured cross section (View the MathML source) with a distorted wave impulse approximation calculation. Such a large occupancy for the neutron 0d5/2 orbital is in line with the N=16 shell closure in 24O., Comment: Published in Physics Letters B (18 October 2014)

Published
2014
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15. One-neutron knockout reaction of 17C on a hydrogen target at 70 MeV/nucleon

Author

Satou, Y., Hwang, J. W., Kim, S., Tshoo, K., Choi, S., Nakamura, T., Kondo, Y., Matsui, N., Hashimoto, Y., Nakabayashi, T., Okumura, T., Shinohara, M., Fukuda, N., Sugimoto, T., Otsu, H., Togano, Y., Motobayashi, T., Sakurai, H., Yanagisawa, Y., Aoi, N., Takeuchi, S., Gomi, T., Ishihara, M., Kawai, S., Ong, H. J., Onishi, T. K., Shimoura, S., Tamaki, M., Kobayashi, T., Matsuda, Y., Endo, N., and Kitayama, M.

Subjects
Nuclear Experiment
Abstract

First experimental evidence of the population of the first 2- state in 16C above the neutron threshold is obtained by neutron knockout from 17C on a hydrogen target. The invariant mass method combined with in-beam gamma-ray detection is used to locate the state at 5.45(1) MeV. Comparison of its populating cross section and parallel momentum distribution with a Glauber model calculation utilizing the shell-model spectroscopic factor confirms the core-neutron removal nature of this state. Additionally, a previously known unbound state at 6.11 MeV and a new state at 6.28(2) MeV are observed. The position of the first 2- state, which belongs to a member of the lowest-lying p-sd cross shell transition, is reasonably well described by the shell-model calculation using the WBT interaction., Comment: 15 pages, 3 figures

Published
2013
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16. The N = 16 spherical shell closure in 24O

Author

Tshoo, K., Satou, Y., Bhang, H., Choi, S., Nakamura, T., Kondo, Y., Deguchi, S., Kawada, Y., Kobayashi, N., Nakayama, Y., Tanaka, K. N., Tanaka, N., Aoi, N., Ishihara, M., Motobayashi, T., Otsu, H., Sakurai, H., Takeuchi, S., Togano, Y., Yoneda, K., Li, Z. H., Delaunay, F., Gibelin, J., Marqués, F. M., Orr, N. A., Honda, T., Matsushita, M., Kobayashi, T., Miyashita, Y., Sumikama, T., Yoshinaga, K., Shimoura, S., Sohler, D., Zheng, T., and Cao, Z. X.

Subjects
Nuclear Experiment
Abstract

The unbound excited states of the neutron drip-line isotope 24O have been investigated via the 24O(p,p')23O+n reaction in inverse kinematics at a beam energy of 62 MeV/nucleon. The decay energy spectrum of 24O* was reconstructed from the momenta of 23O and the neutron. The spin-parity of the first excited state, observed at Ex = 4.65 +/- 0.14 MeV, was determined to be Jpi = 2+ from the angular distribution of the cross section. Higher lying states were also observed. The quadrupole transition parameter beta2 of the 2+ state was deduced, for the first time, to be 0.15 +/- 0.04. The relatively high excitation energy and small beta2 value are indicative of the N = 16 shell closure in 24O., Comment: to be submitted to Physical Review Letters

Published
2012
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19. Gamow-Teller decay of Te142 to I142

Author

Moon, B., primary, Moon, C.-B., additional, Odahara, A., additional, Lozeva, R., additional, Nishimura, S., additional, Yuan, C., additional, Browne, F., additional, Doornenbal, P., additional, Lorusso, G., additional, Patel, Z., additional, Rice, S., additional, Sinclair, L., additional, Söderström, P.-A., additional, Sumikama, T., additional, Watanabe, H., additional, Wu, J., additional, Xu, Z. Y., additional, Yagi, A., additional, Ahn, D. S., additional, Baba, H., additional, Bello Garrote, F. L., additional, Daido, R., additional, Daugas, J. M., additional, Didierjean, F., additional, Fang, Y., additional, Fukuda, N., additional, Hong, B., additional, Ideguchi, E., additional, Inabe, N., additional, Ishigaki, T., additional, Isobe, T., additional, Jung, H. S., additional, Kameda, D., additional, Kojouharov, I., additional, Komatsubara, T., additional, Kubo, T., additional, Kwon, Y. K., additional, Lee, C. S., additional, Lee, P., additional, Morimoto, S., additional, Murai, D., additional, Niikura, M., additional, Nishibata, H., additional, Nishizuka, I., additional, Sakurai, H., additional, Shimizu, Y., additional, Suzuki, H., additional, Takeda, H., additional, Tshoo, K., additional, and Yokoyama, R., additional

Published
2023
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20. Gamow-Teller decay of <math><mmultiscripts><mi>Te</mi><mprescripts/><none/><mn>142</mn></mmultiscripts></math> to <math><mmultiscripts><mi mathvariant='normal'>I</mi><mprescripts/><none/><mn>142</mn></mmultiscripts></math>

Author

Moon, B., Moon, C.-B., Odahara, A., Lozeva, R., Nishimura, S., Yuan, C., Browne, F., Doornenbal, P., Lorusso, G., Patel, Z., Rice, S., Sinclair, L., Söderström, P.-A., Sumikama, T., Watanabe, H., Wu, J., Xu, Z.Y., Yagi, A., Ahn, D.S., Baba, H., Bello Garrote, F.L., Daido, R., Daugas, J.M., Didierjean, F., Fang, Y., Fukuda, N., Hong, B., Ideguchi, E., Inabe, N., Ishigaki, T., Isobe, T., Jung, H.S., Kameda, D., Kojouharov, I., Komatsubara, T., Kubo, T., Kwon, Y.K., Lee, C.S., Lee, P., Morimoto, S., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I., Sakurai, H., Shimizu, Y., Suzuki, H., Takeda, H., Tshoo, K., Yokoyama, R., Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Université Paris-Saclay

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; The β decay of Te90142 to I89142 was investigated for the first time. The parent nucleus was produced by the in-flight fission of a U238 beam with an energy of 345 MeV per nucleon, impinging on a Be9 target at the Radioactive Isotope Beam Factory of RIKEN. Excited states in I142 were established by β-delayed γ-ray spectroscopy. The observed (1+) states in I142 could be interpreted to be predominantly the ν0h9/2⊗π0h11/2 configuration formed by a Gamow-Teller transition between a neutron in the 0h9/2 orbital and a proton in the 0h11/2 orbital. Additional features of the (1+) states are discussed by comparing with neighboring heavier isotones, such as Cs144 and La146. In the context of deformed shell-model calculations, the (11+) state is closely related to the ν[5,3,2]3/2⊗π[5,5,0]1/2 configuration, which may be related to the weak Gamow-Teller transition strength.

Published
2023

23. Various nuclear structures in Xe140 studied by β decay of ground and isomeric states in I140

Author

Yagi, A., primary, Odahara, A., additional, Nishibata, H., additional, Lozeva, R., additional, Moon, C.-B., additional, Nishimura, S., additional, Yoshida, K., additional, Yoshinaga, N., additional, Watanabe, C., additional, Higashiyama, K., additional, Shimoda, T., additional, Daido, R., additional, Fang, Y., additional, Lee, P. S., additional, Moon, B., additional, Doornenbal, P., additional, Lorusso, G., additional, Söderström, P.-A., additional, Sumikama, T., additional, Watanabe, H., additional, Isobe, T., additional, Baba, H., additional, Sakurai, H., additional, Browne, F., additional, Patel, Z., additional, Rice, S., additional, Sinclair, L., additional, Wu, J., additional, Xu, Z. Y., additional, Yokoyama, R., additional, Kubo, T., additional, Inabe, N., additional, Suzuki, H., additional, Fukuda, N., additional, Kameda, D., additional, Takeda, H., additional, Ahn, D. S., additional, Shimizu, Y., additional, Murai, D., additional, Bello Garrote, F. L., additional, Daugas, J.-M., additional, Didierjean, F., additional, Ideguchi, E., additional, Iimura, S., additional, Ishigaki, T., additional, Jung, H. S., additional, Komatsubara, T., additional, Kwon, Y. K., additional, Lee, C. S., additional, Morimoto, S., additional, Niikura, M., additional, Nishizuka, I., additional, and Tshoo, K., additional

Published
2022
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24. First observation of the π0h11/2⊗ν0h9/2 partner orbital configuration in the odd-odd I138 nucleus

Author

Moon, B., primary, Gargano, A., additional, Naïdja, H., additional, Moon, C.-B., additional, Odahara, A., additional, Lozeva, R., additional, Nishimura, S., additional, Yuan, C., additional, Browne, F., additional, Doornenbal, P., additional, Lorusso, G., additional, Patel, Z., additional, Rice, S., additional, Si, M., additional, Sinclair, L., additional, Söderström, P.-A., additional, Sumikama, T., additional, Watanabe, H., additional, Wu, J., additional, Xu, Z. Y., additional, Yagi, A., additional, Ahn, D. S., additional, Baba, H., additional, Bello Garrote, F. L., additional, Daido, R., additional, Daugas, J. M., additional, Didierjean, F., additional, Fang, Y., additional, Fukuda, N., additional, Hong, B., additional, Ideguchi, E., additional, Inabe, N., additional, Ishigaki, T., additional, Isobe, T., additional, Jung, H. S., additional, Kameda, D., additional, Kojouharov, I., additional, Komatsubara, T., additional, Kubo, T., additional, Kwon, Y. K., additional, Lee, C. S., additional, Lee, P., additional, Morimoto, S., additional, Murai, D., additional, Niikura, M., additional, Nishibata, H., additional, Nishizuka, I., additional, Sakurai, H., additional, Shimizu, Y., additional, Suzuki, H., additional, Takeda, H., additional, Tshoo, K., additional, and Yokoyama, R., additional

Published
2022
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25. Various nuclear structures in Xe 140 studied by β decay of ground and isomeric states in i 140

Author

Yagi, A., Odahara, A., Nishibata, H., Lozeva, R., Moon, C.-B., Nishimura, S., Yoshida, K., Yoshinaga, N., Watanabe, C., Higashiyama, K., Shimoda, T., Daido, R., Fang, Y., Lee, P.S., Moon, B., Doornenbal, P., Lorusso, G., Söderström, P.-A., Sumikama, T., Watanabe, H., Isobe, T., Baba, H., Sakurai, H., Browne, F., Patel, Z., Rice, S., Sinclair, L., Wu, J., Xu, Z.Y., Yokoyama, R., Kubo, T., Inabe, N., Suzuki, H., Fukuda, N., Kameda, D., Takeda, H., Ahn, D.S., Shimizu, Y., Murai, D., Bello Garrote, Frank Leonel, Daugas, J.-M., Didierjean, F., Ideguchi, E., Iimura, S., Ishigaki, T., Jung, H.S., Komatsubara, T., Kwon, Y.K., Lee, C.S., Morimoto, S., Niikura, M., Nishizuka, I., and Tshoo, K.

Abstract

Structure of the neutron-rich N=86 isotope 140Xe, located northeast of a doubly-magic nucleus 132Sn, is investigated by β−γ spectroscopy. Two β-decay isomers in 140I are newly found in the study of two different β decays of 140I which were produced by two reactions (i) direct in-flight fission at a primary target and (ii) β decay of 140Te at an active stopper. Half-lives of the β decays of the ground state, the low-spin isomer, and the high-spin isomer are determined to be 0.38(2), 0.91(5), and 0.47(4) s, respectively. Decay schemes of the β decay of the high-spin isomer and of the mixed β decays of the ground state and the low-spin isomer in 140I to 140Xe are constructed using the information on γ-ray coincidence relation and γ-ray intensity. Nuclear structures of the low-lying states in 140Xe and 140I are discussed by comparing the experimental results to two theoretical calculations based on a large-scale shell model and the deformed Skyrme Hartree-Fock-Bogoliubov plus deformed quasiparticle-random-phase approximation. Possible candidates for (quasi-)γ-band members of 2+ and 4+ states and the octupole collective 1− state are proposed in 140Xe. Increase of quadrupole, triaxial, and octupole collectivities is discussed with the increase of neutron and proton numbers.

Published
2022

26. First observation of the $\pi0h_{11/2}\otimes\nu 0h_{9/2}$ partner orbital configuration in the odd-odd $^{138}$I nucleus

Author

Moon, B., Gargano, A., Naïdja, H., Moon, C.-B., Odahara, A., Lozeva, R., Nishimura, S., Yuan, C., Browne, F., Doornenbal, P., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Söderström, P.-A., Sumikama, T., Watanabe, H., Wu, J., Xu, Z.Y., Yagi, A., Ahn, D.S., Baba, H., Bello Garrote, F.L., Daido, R., Daugas, J.M., Didierjean, F., Fang, Y., Fukuda, N., Hong, B., Ideguchi, E., Inabe, N., Ishigaki, T., Isobe, T., Jung, H.S., Kameda, D., Kojouharov, I., Komatsubara, T., Kubo, T., Kwon, Y.K., Lee, C.S., Lee, P., Morimoto, S., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I., Sakurai, H., Shimizu, Y., Suzuki, H., Takeda, H., Tshoo, K., Yokoyama, R., Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Université Paris-Saclay

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; The β-decay scheme of Te138 and the level structure of I138 is reported for the first time. The experiment was performed at the Radioactive Isotope Beam Factory of RIKEN, as one of the EUROBALL-RIKEN Cluster Array campaigns. Secondary radioactive ions, including Te138 and Sb138, were produced by the in-flight fission of a U238 beam with the energy of 345 MeV per nucleon. From the β decay of Te138, the level scheme of I138 was supplemented with new spin and parity assignments, such as the low-lying negative-parity states and a positive-parity 1+ state. This 1+ state can be interpreted as being associated with the π0h11/2⊗ν0h9/2 partner orbital configuration populated by the Gamow-Teller transition between a neutron in the 0h9/2 orbital and a proton in the 0h11/2 orbital. Details of the structure of I138 are discussed in terms of the proton-neutron interactions and Gamow-Teller transition strength within the theoretical context of shell-model calculations.

Published
2022

27. First observation of the π0h11/2-ν0h9/2 partner orbital configuration in the odd-odd i 138 nucleus

Author

Moon, B., Gargano, A., Naïdja, H., Moon, C.-B., Odahara, A., Lozeva, R., Nishimura, S., Yuan, C., Browne, F., Doornenbal, P., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Söderström, P.-A., Sumikama, T., Watanabe, H., Wu, J., Xu, Z.Y., Yagi, A., Ahn, D.S., Baba, H., Bello Garrote, Frank Leonel, Daido, R., Daugas, J.M., Didierjean, F., Fang, Y., Fukuda, N., Hong, B., Ideguchi, E., Inabe, N., Ishigaki, T., Isobe, T., Jung, H.S., Kameda, D., Kojouharov, I., Komatsubara, T., Kubo, T., Kwon, Y.K., Lee, C.S., Lee, P., Morimoto, S., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I., Sakurai, H., Shimizu, Y., Suzuki, H., Takeda, H., Tshoo, K., and Yokoyama, R.

Abstract

The β-decay scheme of 138Te and the level structure of 138I is reported for the first time. The experiment was performed at the Radioactive Isotope Beam Factory of RIKEN, as one of the EUROBALL-RIKEN Cluster Array campaigns. Secondary radioactive ions, including 138Te and 138Sb, were produced by the in-flight fission of a 238U beam with the energy of 345 MeV per nucleon. From the β decay of 138Te, the level scheme of 138I was supplemented with new spin and parity assignments, such as the low-lying negative-parity states and a positive-parity 1+ state. This 1+ state can be interpreted as being associated with the π0h11/2⊗ν0h9/2 partner orbital configuration populated by the Gamow-Teller transition between a neutron in the 0h9/2 orbital and a proton in the 0h11/2 orbital. Details of the structure of 138I are discussed in terms of the proton-neutron interactions and Gamow-Teller transition strength within the theoretical context of shell-model calculations.

Published
2022

28. Coincidence measurement of the weak decay of 12ΛC and the three-body weak decay process (J-PARC 50GeV PS E18)

Author

Kim, M., Ajimura, S., Aoki, K., Banu, A., Bhang, H., Fukuda, T., Hashimoto, O., Hwang, J.I., Kameoka, S., Kang, B.H., Kim, E., Kim, J.H., Maruta, T., Miura, Y., Miyake, Y., Nagae, T., Nakamura, M., Nakamura, S.N., Noumi, H., Okada, S., Okayasu, Y., Outa, H., Park, H., Saha, P.K., Sato, Y., Sekimoto, M., Takahashi, T., Tamura, H., Tanida, K., Toyoda, A., Tshoo, K., Tsukada, K., Watanabe, T., and Yim, H.J.

Published
2010
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30. The Strong Three-body Weak Interaction Contribution in the Nonmesonic Weak Decay of p-shell Λ Hypernuclei

Author

Bhang, H., Ajimura, S., Aoki, K., Banu, A., Fukuda, T., Hashimoto, O., Hwang, J. I., Kameoka, S., Kang, B. H., Kim, E., Kim, J. H., Kim, M., Maruta, T., Miura, Y., Miyake, Y., Nagae, T., Nakamura, M., Nakamura, S. N., Noumi, H., Okada, S., Okayasu, Y., Outa, H., Park, H., Saha, P. K., Sato, Y., Sekimoto, M., Takahashi, T., Tamura, H., Tanida, K., Toyoda, A., Tshoo, K., Tsukada, K., Watanabe, T., and Yim, H. J.

Published
2013
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31. Invariant Mass Spectroscopy of 23O via the (p, p′) Reaction in Inverse Kinematics

Author

Satou, Y., Tshoo, K., Bhang, H., Choi, S., Hwang, J. W., Nakamura, T., Kondo, Y., Nakayama, Y., Kobayashi, N., Tanaka, K. N., Deguchi, S., Kawada, Y., Tanaka, N., Motobayashi, T., Sakurai, H., Otsu, H., Aoi, N., Takeuchi, S., Yoneda, K., Togano, Y., Ishihara, M., Shimoura, S., Kobayashi, T., Matsushita, M., Honda, T., Sumikama, T., Miyashita, Y., Yoshinaga, K., Orr, N. A., Marques, F. M., Gibelin, J., Delaunay, F., Sohler, D., Zheng, T., Li, Z. H., and Cao, Z. X.

Published
2013
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32. Three-Body ΛNN → nNN Nonmesonic Weak Decay Process of Λ Hypernuclei

Author

Bhang, H., Ajimura, S., Aoki, K., Banu, A., Fukuda, T., Hashimoto, O., Hwang, J. I., Kameoka, S., Kang, B. H., Kim, E., Kim, J. H., Kim, M., Maruta, T., Miura, Y., Miyake, Y., Nagae, T., Nakamura, M., Nakamura, S. N., Noumi, H., Okada, S., Okayasu, Y., Outa, H., Park, H., Saha, P. K., Sato, Y., Sekimoto, M., Takahashi, T., Tamura, H., Tanida, K., Toyoda, A., Tshoo, K., Tsukada, K., Watanabe, T., and Yim, H. J.

Published
2013
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33. The N = 16 Spherical Shell Closure in 24O

Author

Tshoo, K., Satou, Y., Bhang, H., Choi, S., Nakamura, T., Deguchi, S., Kawada, Y., Kondo, Y., Kobayashi, N., Nakayama, Y., Tanaka, K. N., Tanaka, N., Aoi, N., Ishihara, M., Motobayashi, T., Otsu, H., Sakurai, H., Takeuchi, S., Togano, Y., Yoneda, K., Li, Z. H., Delaunay, F., Gibelin, J., Marques, F. M., Orr, N. A., Honda, T., Matsushita, M., Kobayashi, T., Miyashita, Y., Sumikama, T., Yoshinaga, K., Shimoura, S., Sohler, D., Zheng, T., and Cao, Z.X.

Published
2013
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34. Nuclear structure of Te isotopes beyond neutron magic number N=82

Author

Moon, B., Jungclaus, A., Naidja, H., Gargano, A., Lozeva, R., Moon, C-B, Odahara, A., Simpson, G. S., Nishimura, S., Browne, F., Doornenbal, P., Gey, G., Keatings, J., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Soderstrom, P-A, Sumikama, T., Taprogge, J., Watanabe, H., Wu, J., Xu, Z. Y., Yagi, A., Ahn, D. S., Baba, H., Garrote, F. L. Bello, Boenig, S., Daido, R., Daugas, J. M., Didierjean, F., Drouet, F., Fang, Y., Fukuda, N., Gernhaeuser, R., Hong, B., Ideguchi, E., Ilieva, S., Inabe, N., Ishigaki, T., Isobe, T., Jung, H. S., Kameda, D., Kojouharov, I, Komatsubara, T., Kroell, T., Kubo, T., Kurz, N., Kwon, Y. K., Lee, C. S., Lee, P., Li, Z., Montaner-Piza, A., Morimoto, S., Moschner, K., Muecher, D., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I, Orlandi, R., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Tshoo, K., Vajta, Zs, Wendt, A., Yokoyama, R., Yoshinaga, K., Moon, B., Jungclaus, A., Naidja, H., Gargano, A., Lozeva, R., Moon, C-B, Odahara, A., Simpson, G. S., Nishimura, S., Browne, F., Doornenbal, P., Gey, G., Keatings, J., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Soderstrom, P-A, Sumikama, T., Taprogge, J., Watanabe, H., Wu, J., Xu, Z. Y., Yagi, A., Ahn, D. S., Baba, H., Garrote, F. L. Bello, Boenig, S., Daido, R., Daugas, J. M., Didierjean, F., Drouet, F., Fang, Y., Fukuda, N., Gernhaeuser, R., Hong, B., Ideguchi, E., Ilieva, S., Inabe, N., Ishigaki, T., Isobe, T., Jung, H. S., Kameda, D., Kojouharov, I, Komatsubara, T., Kroell, T., Kubo, T., Kurz, N., Kwon, Y. K., Lee, C. S., Lee, P., Li, Z., Montaner-Piza, A., Morimoto, S., Moschner, K., Muecher, D., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I, Orlandi, R., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Tshoo, K., Vajta, Zs, Wendt, A., Yokoyama, R., and Yoshinaga, K.

Abstract

Newly observed decay schemes of the nuclei Sb-137 and Sb-138 are reported. The neutron-rich Sb isotopes were produced by the in-flight fragmentation of a U-238 primary beam with an energy of 345 MeV/nucleon. Several new excited states of Te-137 with tentatively assigned spin-parities of (5/2(-)), (9/2(-)), and (7/2) have been established which play an important role in the evolution of neutron levels beyond N = 82. The study of the beta decay of Sb-138 led to a considerable extension of the level scheme of Te-138 including the identification of several nonyrast states. The structure of Te-137 and Te-138 is discussed on the basis of large-scale shell-model calculations performed using two different effective interactions.

Published
2021

35. Nuclear structure of Te isotopes beyond neutron magic number N=82

Author

RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Institute for Basic Science (South Korea), National Research Foundation of Korea, Ministerio de Economía y Competitividad (España), Japan Society for the Promotion of Science, National Research, Development and Innovation Office (Hungary), Moon, B., Jungclaus, Andrea, Naïdja, H., Gargano, A., Lozeva, R., Moon, C.B., Odahara, A., Simpson, G. S., Nishimura, S., Browne, F., Doornenbal, P., Gey, G., Keatings, J., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Söderström, P. A., Sumikama, T., Taprogge, J., Watanabe, H., Wu, J., Xu, Z. Y., Yagi, A., Ahn, D. S., Baba, H., Bello Garrote, F. L., Bönig, S., Daido, R., Daugas, J.M., Didierjean, F., Drouet, F., Fang, Y., Fukuda, N., Gernhäuser, R., Hong, B., Ideguchi, E., Ilieva, S., Inabe, N., Ishigaki, T., Isobe, T., Jung, H. S., Kameda, D., Kojouharov, I., Komatsubara, T., Kröll, T., Kubo, T., Kurz, N., Kwon, Y. K., Lee, C. S., Lee, P., Li, Z., Montaner-Pizá, A., Morimoto, S., Moschner, K., Mücher, D., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I., Orlandi, R., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Tshoo, K., Vajta, Zs, Wendt, A., Yokoyama, R., Yoshinaga, K., RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Institute for Basic Science (South Korea), National Research Foundation of Korea, Ministerio de Economía y Competitividad (España), Japan Society for the Promotion of Science, National Research, Development and Innovation Office (Hungary), Moon, B., Jungclaus, Andrea, Naïdja, H., Gargano, A., Lozeva, R., Moon, C.B., Odahara, A., Simpson, G. S., Nishimura, S., Browne, F., Doornenbal, P., Gey, G., Keatings, J., Lorusso, G., Patel, Z., Rice, S., Si, M., Sinclair, L., Söderström, P. A., Sumikama, T., Taprogge, J., Watanabe, H., Wu, J., Xu, Z. Y., Yagi, A., Ahn, D. S., Baba, H., Bello Garrote, F. L., Bönig, S., Daido, R., Daugas, J.M., Didierjean, F., Drouet, F., Fang, Y., Fukuda, N., Gernhäuser, R., Hong, B., Ideguchi, E., Ilieva, S., Inabe, N., Ishigaki, T., Isobe, T., Jung, H. S., Kameda, D., Kojouharov, I., Komatsubara, T., Kröll, T., Kubo, T., Kurz, N., Kwon, Y. K., Lee, C. S., Lee, P., Li, Z., Montaner-Pizá, A., Morimoto, S., Moschner, K., Mücher, D., Murai, D., Niikura, M., Nishibata, H., Nishizuka, I., Orlandi, R., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Tshoo, K., Vajta, Zs, Wendt, A., Yokoyama, R., and Yoshinaga, K.

Abstract

Newly observed decay schemes of the nuclei Sb137 and Sb138 are reported. The neutron-rich Sb isotopes were produced by the in-flight fragmentation of a U238 primary beam with an energy of 345 MeV/nucleon. Several new excited states of Te137 with tentatively assigned spin-parities of (5/2-), (9/2-), and (7/2) have been established which play an important role in the evolution of neutron levels beyond N=82. The study of the ß decay of Sb138 led to a considerable extension of the level scheme of Te138 including the identification of several nonyrast states. The structure of Te137 and Te138 is discussed on the basis of large-scale shell-model calculations performed using two different effective interactions.

Published
2021

36. Nuclear structure of Te isotopes beyond neutron magic number N=82

Author

Moon, B., primary, Jungclaus, A., additional, Naïdja, H., additional, Gargano, A., additional, Lozeva, R., additional, Moon, C.-B., additional, Odahara, A., additional, Simpson, G. S., additional, Nishimura, S., additional, Browne, F., additional, Doornenbal, P., additional, Gey, G., additional, Keatings, J., additional, Lorusso, G., additional, Patel, Z., additional, Rice, S., additional, Si, M., additional, Sinclair, L., additional, Söderström, P.-A., additional, Sumikama, T., additional, Taprogge, J., additional, Watanabe, H., additional, Wu, J., additional, Xu, Z. Y., additional, Yagi, A., additional, Ahn, D. S., additional, Baba, H., additional, Bello Garrote, F. L., additional, Bönig, S., additional, Daido, R., additional, Daugas, J. M., additional, Didierjean, F., additional, Drouet, F., additional, Fang, Y., additional, Fukuda, N., additional, Gernhäuser, R., additional, Hong, B., additional, Ideguchi, E., additional, Ilieva, S., additional, Inabe, N., additional, Ishigaki, T., additional, Isobe, T., additional, Jung, H. S., additional, Kameda, D., additional, Kojouharov, I., additional, Komatsubara, T., additional, Kröll, T., additional, Kubo, T., additional, Kurz, N., additional, Kwon, Y. K., additional, Lee, C. S., additional, Lee, P., additional, Li, Z., additional, Montaner-Pizá, A., additional, Morimoto, S., additional, Moschner, K., additional, Mücher, D., additional, Murai, D., additional, Niikura, M., additional, Nishibata, H., additional, Nishizuka, I., additional, Orlandi, R., additional, Sakurai, H., additional, Schaffner, H., additional, Shimizu, Y., additional, Steiger, K., additional, Suzuki, H., additional, Takeda, H., additional, Tshoo, K., additional, Vajta, Zs., additional, Wendt, A., additional, Yokoyama, R., additional, and Yoshinaga, K., additional

Published
2021
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37. β-decay half-lives of 55 neutron-rich isotopes beyond the N = 82 shell gap

Author

Wu, J., Nishimura, S., Möller, P., Mumpower, M.r., Lozeva, R., Moon, C.B., Odahara, A., Baba, H., Browne, F., Daido, R., Doornenbal, P., Fang, Y. F., Haroon, M., Isobe, T., Jung, H. S., Lorusso, G., Moon, B., Patel, Z., Rice, S., Sakurai, H., Shimizu, Y, Sinclair, L., Söderström, P.-A., Sumikama, T., Watanabe, H., Xu, Z. Y., Yagi, A., Yokoyama, R., Ahn, D. S., Bello Garrote, Frank Leonel, Daugas, J.M., Didierjean, F., Fukuda, N., Inabe, N., Ishigaki, T., Kameda, T., Kojouharov, I., Komatsubara, T., Kubo, T., Kurz, N., Kwon, K. Y., Morimoto, S., Murai, D., Nishibata, H., Schaffner, H., Sprouse, T. M., Suzuki, H., Takeda, H., Tanaka, M., Tshoo, K., and Wakabayashi, Y.

Abstract

The β-decay half-lives of 55 neutron-rich nuclei 134−139Sn, 134−142Sb, 137−144Te, 140−146I, 142−148Xe, 145−151Cs, 148−153Ba, and 151−155La were measured at the Radioactive Isotope Beam Factory employing the projectile fission fragments of 238U. The nuclear level structure, which relates to deformation, has a large effect on the half-lives. The impact of newly measured half-lives on modeling the astrophysical origin of the heavy elements is studied in the context of r process nucleosynthesis. For a wide variety of astrophysical conditions, including those in which fission recycling occurs, the half-lives have an important local impact on the second (A ≈ 130) peak.

Published
2020

38. β -decay half-lives of 55 neutron-rich isotopes beyond the N=82 shell gap

Author

Wu, J., primary, Nishimura, S., additional, Möller, P., additional, Mumpower, M. R., additional, Lozeva, R., additional, Moon, C. B., additional, Odahara, A., additional, Baba, H., additional, Browne, F., additional, Daido, R., additional, Doornenbal, P., additional, Fang, Y. F., additional, Haroon, M., additional, Isobe, T., additional, Jung, H. S., additional, Lorusso, G., additional, Moon, B., additional, Patel, Z., additional, Rice, S., additional, Sakurai, H., additional, Shimizu, Y., additional, Sinclair, L., additional, Söderström, P.-A., additional, Sumikama, T., additional, Watanabe, H., additional, Xu, Z. Y., additional, Yagi, A., additional, Yokoyama, R., additional, Ahn, D. S., additional, Bello Garrote, F. L., additional, Daugas, J. M., additional, Didierjean, F., additional, Fukuda, N., additional, Inabe, N., additional, Ishigaki, T., additional, Kameda, D., additional, Kojouharov, I., additional, Komatsubara, T., additional, Kubo, T., additional, Kurz, N., additional, Kwon, K. Y., additional, Morimoto, S., additional, Murai, D., additional, Nishibata, H., additional, Schaffner, H., additional, Sprouse, T. M., additional, Suzuki, H., additional, Takeda, H., additional, Tanaka, M., additional, Tshoo, K., additional, and Wakabayashi, Y., additional

Published
2020
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39. Design study of 10 kW direct fission target for RISP project

Author

Tshoo K., Jang D.Y., Woo H.J., Kang B.H., Kim G.D., Hwang W., and Kim Y.K.

Subjects
Physics, QC1-999
Abstract

We are developing Isotope Separation On-Line (ISOL) target system, which consists of 1.3 mm-thick uranium-carbide multi-disks and cylindrical tantalum heater, to be installed in new facility for Rare Isotope Science Project in Korea. The intense neutron-rich nuclei are produced via the fission process using the uranium carbide targets with a 70 MeV proton beam. The fission rate was estimated to be ∼1.5 × 1013/sec for 10 kW proton beam. The target system has been designed to be operated at a temperature of ∼2000 °C so as to improve the release effciency.

Published
2014
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40. Neutron occupancy of 0d5/2 orbital in 24O

Author

Tshoo K., Satou Y., Bhang H., Choi S., Nakamura T., Kondo Y., Deguchi S., Kawada Y., Kobayashi N., Nakayama Y., Tanaka K.N., Tanaka N., Togano Y., Aoi N., Ishihara M., Motobayashi T., Otsu H., Sakurai H., Takeuchi S., Yoneda K., Delaunay F., Gibelin J., Marqués F.M., Orr N.A., Honda T., Matsushita M., Kobayashi T., Miyashita Y., Sumikama T., Yoshinaga K., Shimoura S., Sohler D., Zheng T., Cao Z.X., and Li Z.H.

Subjects
Physics, QC1-999
Abstract

The partial one-neutron removal cross section of 24O leading to the first excited state in 23O has been measured to be 65.7 ± 5.3 mb with a proton target in inverse kinematics at the beam energy of 62 MeV/nucleon. The decay energy spectrum of the neutron unbound state of 23O was reconstructed from the measured four momenta of 22O and the emitted neutron. A sharp peak was observed at Edecay = 48 ± 3 keV, confirming the previous measurements. The measured partial longitudinal momentum distribution of 23O* showed the d-wave knockout character, providing a support for the Jπ assignment of 5/2+ for this state. The spectroscopic factor for the neutrons in 0d5/2 orbital was deduced, for the first time, to be C2S(0d5/2) = 3.7 ± 0.3 (preliminary) by comparing with the result of Glauber model. The relatively large spectroscopic factor supports the N = 16 shell closure in the neutron drip-line nucleus 24O.

Published
2014
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41. Neutron-rich rare isotope production with stable and radioactive beams in the mass range A ∼ 40-60 at beam energy around 15 MeV/nucleon

Author

Papageorgiou, A. Souliotis, G.A. Tshoo, K. Jeong, S.C. Kang, B.H. Kwon, Y.K. Veselsky, M. Yennello, S.J. Bonasera, A.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

We studied the production of neutron-rich nuclides in multinucleon transfer collisions of stable and radioactive beams (RIB) in the mass range A ∼ 40-60. We first presented our experimental cross section data of projectile fragments from the reaction of 40Ar(15 MeV/nucleon) with 64Ni, 58Ni and 27Al. We then compared them with calculations based on either the deep-inelastic transfer model or the constrained molecular dynamics model, followed by the statistical multifragmentation model. An overall good agreement of the calculations with the experimental data is obtained. We continued with calculations of the reaction of 40Ar (15 MeV/nucleon) with 238U target and then with reactions of 48Ca (15 MeV/nucleon) with 64Ni and 238U targets. In these reactions, very neutron-rich rare isotopes are produced with large cross sections. These nuclides, in turn, can be assumed to form RIB and interact with a subsequent target (preferably 238U), leading to the production of extremely neutron-rich and even new isotopes (e.g. 60Ca) in this mass range. We conclude that multinucleon transfer reactions with stable or RIB at energy around 15 MeV/nucleon offer an effective route to access extremely neutron-rich rare isotopes for nuclear structure or reaction studies. © 2018 IOP Publishing Ltd.

Published
2018

44. The Contribution of the Three-Body Process in the Nonmesonic Weak Decay of the Λ12C Hypernucleus.

Author

Takahashi T., Sekimoto M., Saha P.K., Sato Y., Outa H., Park H., Okayasu Y., Noumi H., Okada S., Nakamura S.N., Nakamura M., Nagae T., Miyake Y., Miura Y., Maruta T., Kim J.H., Kim E., Kang B.H., Kameoka S., Hwang J.I., Hashimoto O., Fukuda T., Banu A., Aoki K., Ajimura S., Bhang H., Tamura H., Tanida K., Toyoda A., Tshoo K., Tsukada K., Watanabe T., and Yim H.J.

Subjects
Physics, QC1-999
Abstract

The serious inconsistency problem between the values of experimental and theoretical Γn /Γp ratio of the nonmesonic weak decay of Λ hypernuclei has been resolved recently. We have shown that the reason behind the problem was the quenching of the nucleon yields which in turn was due to the contribution of the three-body process. We have measured that the branching ratio of the three-body process in nonmesonic weak decay, 0.29±0.13, is so large that the absolute values of Γn and Γp must be determined taking account of the contribution of the 3-body process. In this paper, the recent studies toward the finding of the 3-body process via the exclusive coincidence experiments are presented.

Published
2010
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45. Nuclear structure and β -decay schemes for Te nuclides beyond N=82

Author

Moon, B., Moon, C.B., Söderström, P.A., Odahara, A., Lozeva, R., Hong, B., Browne, F., Jung, H.S., Lee, P., Lee, C.S., Yagi, A., Yuan, C., Nishimura, S., Doornenbal, P., Lorusso, G., Sumikama, T., Watanabe, H., Kojouharov, I., Isobe, T., Baba, H., Sakurai, H., Daido, R., Fang, Y., Nishibata, H., Patel, Z., Rice, S., Sinclair, L., Wu, J., Xu, Z.Y., Yokoyama, R., Kubo, T., Inabe, N., Suzuki, H., Fukuda, N., Kameda, D., Takeda, H., Ahn, D.S., Shimizu, Y., Murai, D., Bello Garrote, F.L., Daugas, J.M., Didierjean, F., Ideguchi, E., Ishigaki, T., Morimoto, S., Niikura, M., Nishizuka, I., Komatsubara, T., Kwon, Y.K., Tshoo, K., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière ( CSNSM ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Institut Pluridisciplinaire Hubert Curien ( IPHC ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Strasbourg ( UNISTRA ), Direction des Applications Militaires ( DAM ), and Commissariat à l'énergie atomique et aux énergies alternatives ( CEA )

Subjects
27.60.+j, Astrophysics::High Energy Astrophysical Phenomena, 21.60.Cs, 21.10.Re, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, 23.40.-s
Abstract

International audience; We study for the first time the internal structure of Te140 through the β-delayed γ-ray spectroscopy of Sb140. The very neutron-rich Sb140 nuclei with Z=51 and N=89 were produced by the in-flight fission of U238 beams at the Radioactive Isotope Beam Factory, RIKEN. The half-life and spin-parity of Sb140 are reported as 173±12 ms and 3−, respectively. In addition to the excited states of Te140 produced by the β-decay branch, the β-delayed one-neutron and two-neutron emission branches were also established. By identifying the first 2+ and 4+ excited states of Te140, we found that Te isotopes persist in their vibrator character with E(4+)/E(2+)=2. We discuss the distinctive features manifest in this region revealed in pairs of isotopes with the same neutron holes and particles with respect to N=82.

Published
2017

47. Design status of KOBRA for rare isotope production and direct measurements of radiative capture cross sections

Author

Tshoo, K. Chae, H. Park, J. Moon, J.Y. Kwon, Y.K. Souliotis, G.A. Hashimoto, T. Akers, C. Berg, G.P.A. Choi, S. Jeong, S.C. Kato, S. Kim, Y.K. Kubono, S. Lee, K.B. Moon, C.-B.

Subjects
Physics::Accelerator Physics, Nuclear Experiment
Abstract

KOBRA (KOrea Broad acceptance Recoil spectrometer and Apparatus) facility being designed at Rare Isotope Science Project in Korea will be utilized to produce rare isotope beams by employing multi-nucleon transfer reactions at about 20 MeV/nucleon for studies of nuclear structure. KOBRA will also provide high suppression of beam induced background for direct measurements of radiative-capture cross sections in the astrophysical energy range. The present design status of the KOBRA facility is reported along with a brief introduction to the facility. We have studied the feasibility of production of 44Ti based on the present design of KOBRA as an example, and calculated the intensity of 44Ti secondary beam, to be about 105 particles per second, for 1 pnA 46Ti primary beam with a carbon target for a beam energy of 25 MeV/nucleon. A Monte Carlo simulation with a ray-tracing code has been performed to show that recoil products 66Se are well separated from a 65As beam by KOBRA for the 65As(p,γ)66Se reaction at a beam energy of 1 MeV/nucleon. © 2015 Elsevier B.V. All rights reserved.

Published
2016

48. Neutron-rich rare-isotope production from projectile fission of heavy nuclei near 20 MeV/nucleon beam energy

Author

Vonta, N. Souliotis, G.A. Loveland, W. Kwon, Y.K. Tshoo, K. Jeong, S.C. Veselsky, M. Bonasera, A. Botvina, A.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

We investigate the possibilities of producing neutron-rich nuclides in projectile fission of heavy beams in the energy range of 20 MeV/nucleon expected from low-energy facilities. We report our efforts to theoretically describe the reaction mechanism of projectile fission following a multinucleon transfer collision at this energy range. Our calculations are mainly based on a two-step approach: The dynamical stage of the collision is described with either the phenomenological deep-inelastic transfer model (DIT) or with the microscopic constrained molecular dynamics model (CoMD). The de-excitation or fission of the hot heavy projectile fragments is performed with the statistical multifragmentation model (SMM). We compared our model calculations with our previous experimental projectile-fission data of U238 (20 MeV/nucleon) + Pb208 and Au197 (20 MeV/nucleon) + Au197 and found an overall reasonable agreement. Our study suggests that projectile fission following peripheral heavy-ion collisions at this energy range offers an effective route to access very neutron-rich rare isotopes toward and beyond the astrophysical r-process path. © 2016 American Physical Society.

Published
2016

49. β-decay scheme ofTe140toI140: Suppression of Gamow-Teller transitions between the neutronh9/2and protonh11/2partner orbitals

Author

Moon, B., primary, Moon, C.-B., additional, Odahara, A., additional, Lozeva, R., additional, Söderström, P.-A., additional, Browne, F., additional, Yuan, C., additional, Yagi, A., additional, Hong, B., additional, Jung, H. S., additional, Lee, P., additional, Lee, C. S., additional, Nishimura, S., additional, Doornenbal, P., additional, Lorusso, G., additional, Sumikama, T., additional, Watanabe, H., additional, Kojouharov, I., additional, Isobe, T., additional, Baba, H., additional, Sakurai, H., additional, Daido, R., additional, Fang, Y., additional, Nishibata, H., additional, Patel, Z., additional, Rice, S., additional, Sinclair, L., additional, Wu, J., additional, Xu, Z. Y., additional, Yokoyama, R., additional, Kubo, T., additional, Inabe, N., additional, Suzuki, H., additional, Fukuda, N., additional, Kameda, D., additional, Takeda, H., additional, Ahn, D. S., additional, Shimizu, Y., additional, Murai, D., additional, Bello Garrote, F. L., additional, Daugas, J. M., additional, Didierjean, F., additional, Ideguchi, E., additional, Ishigaki, T., additional, Morimoto, S., additional, Niikura, M., additional, Nishizuka, I., additional, Komatsubara, T., additional, Kwon, Y. K., additional, and Tshoo, K., additional

Published
2017
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