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114. Experimental study of Gamow-Teller transitions via the high-energy-resolution O 18 (He 3,t) F 18 reaction: Identification of the low-energy >super>-Gamow-Teller state

Author

Fujita, H., Fujita, Y., Utsuno, Y., Yoshida, K., Adachi, T., Algora, Alejandro, Csatlós, M., Deaven, J.M., Estevez-Aguado, E., Guess, C.J., Gulyás, J., Hatanaka, K., Hirota, K., Hutton, R., Ishikawa, D., Krasznahorkay, A., Matsubara, H., Molina, F., Okamura, H., Ong, H.J., Perdikakis, G., Rubio, B., Scholl, C., Shimbara, Y., Süsoy, G., Suzuki, T., Tamii, A., Thies, J.H., Zegers, R.G.T., Zenihiro, J., Ministerio de Economía y Competitividad (España), and Ministerio de Ciencia, Innovación y Universidades (España)

Abstract

Using the high-resolution O18(He3,t)F18 reaction at 0 and at 140 MeV/nucleon, Gamow-Teller (GT) transitions were studied. A high energy resolution of 31 keV was achieved by applying dispersion matching techniques. The main part of the observed GT transition strength is concentrated in the transition to the F18 ground state (g.s.). The absolute values of the reduced GT transition strengths, B(GT), were derived up to Ex=12 MeV assuming proportionality between the B(GT) values and the reaction cross sections at 0. The B(GT) value obtained from the β decay of F18 (g.s.) →O18 (g.s.) was used to determine the proportionality constant. A total B(GT) of 4.06(5) was found and 76(1)% of the strength is concentrated to the ground state of F18. The obtained B(GT) values were compared with those from the O18(p,n)F18 reaction and the mirror symmetric β+ decay of Ne18→F18. The candidates for 1+ states with isospin T=1 were identified by comparison with the O18(p,p′) data. The results of shell-model and quasiparticle-random-phase approximation calculations suggest constructive contributions of various configurations to the F18 ground state, suggesting that this state is the low-energy super GT state.

Published
2019

115. Experimental Study Of Gamow-Teller Transitions Via The High-Energy-Resolution O-18(He-3, T)F-18 Reaction: Identification Of The Low-Energy 'Super' -Gamow-Teller State

Author

Fujita, H., Fujita, Y., Utsuno, Y., Yoshida, K., Adachi, T., Algora, A., Csatlos, M., Deaven, J. M., Estevez-Aguado, E., Guess, C. J., Gulyas, J., Hatanaka, K., Hirota, K., Hutton, R., Ishikawa, D., Krasznahorkay, A., Matsubara, H., Molina, F., Okamura, H., and Ong, H. J.

Abstract

Using the high-resolution O-18(He-3, t)F-18 reaction at 0 degrees and at 140 MeV/nucleon, Gamow-Teller (GT) transitions were studied. A high energy resolution of 31 keV was achieved by applying dispersion matching techniques. The main part of the observed GT transition strength is concentrated in the transition to the F-18 ground state (g.s.). The absolute values of the reduced GT transition strengths, B(GT), were derived up to E-x = 12 MeV assuming proportionality between the B(GT) values and the reaction cross sections at 0 degrees. The B(GT) value obtained from the beta decay of F-18 (g.s.) -> O-18 (g.s.) was used to determine the proportionality constant. A total B(GT) of 4.06(5) was found and 76(1)% of the strength is concentrated to the ground state of F-18. The obtained B(GT) values were compared with those from the O-18(p, n) F-18 reaction and the mirror symmetric beta(+) decay of Ne-18 -> F-18. The candidates for 1(+) states with isospin T = 1 were identified by comparison with the O-18(p, p') data. The results of shell-model and quasiparticle-random-phase approximation calculations suggest constructive contributions of various configurations to the F-18 ground state, suggesting that this state is the low-energy super GT state.

Published
2019

121. How different is the core of $^{25}$F from $^{24}$O$_{g.s.}$?

Author

Tang, T.L., Uesaka, T., Kawase, S., Beaumel, D., Dozono, M., Fujii, T., Fukuda, N., Fukunaga, T., Galindo-Uribarri, A., Hwang, S.H., Inabe, N., Kameda, D., Kawahara, T., Kim, W., Kisamori, K., Kobayashi, M., Kubo, T., Kubota, Y., Kusaka, K., Lee, C.S., Maeda, Y., Matsubara, H., Michimasa, S., Miya, H., Noro, T., Obertelli, A., Ogata, K., Ota, S., Padilla-Rodal, E., Sakaguchi, S., Sakai, H., Sasano, M., Shimoura, S., Stepanyan, S.S., Suzuki, H., Takaki, M., Takeda, H., Tokieda, H., Wakasa, T., Wakui, T., Yako, K., Yanagisawa, Y., Yasuda, J., Yokoyama, R., Yoshida, K., Zenihiro, J., Institut de Physique Nucléaire d'Orsay (IPNO), 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 de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

The neutron-shell structure of $^{25}$F was studied using quasi-free (p,2p) knockout reaction at 270A MeV in inverse kinematics. The sum of spectroscopic factors of $\pi$0d$_{5/2}$ orbital is found to be $1.0 \pm 0.3$. However, the spectroscopic factor for the ground-state to ground-state transition ($^{25}$F, $^{24}$O$_{g.s.}$) is only $0.36\pm 0.13$, and $^{24}$O excited states are produced from the 0d$_{5/2}$ proton knockout. The result shows that the $^{24}$O core of $^{25}$F nucleus significantly differs from a free $^{24}$O nucleus, and the core consists of 35% $^{24}$O$_{g.s}$. and 65% excited $^{24}$O.

Published
2018

132. Search for |$\alpha$| condensed states in |$^{13}$|C using |$\alpha$| inelastic scattering.

Author

Inaba, K, Sasamoto, Y, Kawabata, T, Fujiwara, M, Funaki, Y, Hatanaka, K, Itoh, K, Itoh, M, Kawase, K, Matsubara, H, Maeda, Y, Suda, K, Sakaguchi, S, Shimizu, Y, Tamii, A, Tameshige, Y, Uchida, M, Uesaka, T, Yamada, T, and Yoshida, H P

Subjects
DIPOLE moments, BORN approximation, QUANTUM theory, ORTHOGONAL decompositions, ORTHOGONAL arrays
Abstract

We searched for the |$\alpha$| condensed state in |$^{13}$| C by measuring the |$\alpha$| inelastic scattering at |$E_\alpha = 388$| MeV at forward angles including 0 |$^\circ$|⁠. We performed a distorted-wave Born approximation calculation with the single-folding potential and multipole decomposition analysis to determine the isoscalar transition strengths in |$^{13}$| C. We found a bump structure around |$E_x = 12.5$| MeV due to the isoscalar monopole (⁠|$IS0$|⁠) transition. A peak-fit analysis suggested that this bump consisted of several |$1/2^-$| states. We propose that this bump is due to the mirror state of the 13.5 MeV state in |$^{13}$| N, which dominantly decays to the |$\alpha$| condensed state in |$^{12}$| C. It was speculated that the |$1/2^-$| states around |$E_x = 12.5$| MeV were candidates for the |$\alpha$| condensed state, but the |$3\alpha + n$| orthogonality condition model suggests that the |$\alpha$| condensed state is unlikely to emerge as the negative parity states. We also found two |$1/2^+$| or |$3/2^+$| states at |$E_x = 14.5$| and 16.1 MeV excited with the isoscalar dipole (⁠|$IS1$|⁠) strengths. We suggest that the 16.1 MeV state is a possible candidate for the |$\alpha$| condensed state predicted by the cluster model calculations on the basis of the good correspondence between the experimental and calculated level structures. However, the theoretical |$IS1$| transition strength for this state is significantly smaller than the measured value. Further experimental information is strongly desired to establish the |$\alpha$| condensed state in |$^{13}$| C. [ABSTRACT FROM AUTHOR]

Published
2021
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143. Systematic analysis of inelastic α scattering off self-conjugate A=4n nuclei

Author

Adachi, S., Kawabata, T., Minomo, K., Kadoya, T., Yokota, N., Akimune, H., Baba, T., Fujimura, H., Fujiwara, M., Funaki, Y., Furuno, T., Hashimoto, T., Hatanaka, K., Inaba, K., Ishii, Y., Itoh, M., Iwamoto, C., Kawase, K., Maeda, Y., Matsubara, H., Matsuda, Y., Matsuno, H., Morimoto, T., Morita, H., Murata, M., Nanamura, T., Ou, I., Sakaguchi, S., Sasamoto, Y., Sawada, R., Shimizu, Y., Suda, K., Tamii, A., Tameshige, Y., Tsumura, M., Uchida, M., Uesaka, T., Yoshida, H. P., and Yoshida, S.

Published
2018

144. Experimental study of Gamow-Teller transitions via the high-energy-resolution O18(He3,t)F18 reaction: Identification of the low-energy “super” -Gamow-Teller state

Author

Fujita, H., primary, Fujita, Y., additional, Utsuno, Y., additional, Yoshida, K., additional, Adachi, T., additional, Algora, A., additional, Csatlós, M., additional, Deaven, J. M., additional, Estevez-Aguado, E., additional, Guess, C. J., additional, Gulyás, J., additional, Hatanaka, K., additional, Hirota, K., additional, Hutton, R., additional, Ishikawa, D., additional, Krasznahorkay, A., additional, Matsubara, H., additional, Molina, F., additional, Okamura, H., additional, Ong, H. J., additional, Perdikakis, G., additional, Rubio, B., additional, Scholl, C., additional, Shimbara, Y., additional, Süsoy, G., additional, Suzuki, T., additional, Tamii, A., additional, Thies, J. H., additional, Zegers, R. G. T., additional, and Zenihiro, J., additional

Published
2019
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146. Genome-Wide Association Study in Patients with Pulmonary Mycobacterium Avium Complex Disease

Author

Namkoong, H., primary, Omae, Y., additional, Asakura, T., additional, Yoshida, M., additional, Suzuki, S., additional, Morimoto, K., additional, Oler, A.J., additional, Szymanski, E.P., additional, Matsuda, S., additional, Yagi, K., additional, Ishii, M., additional, Hase, I., additional, Nishimura, T., additional, Sasaki, Y., additional, Asami, T., additional, Shiomi, T., additional, Matsubara, H., additional, Shimada, H., additional, Ato, M., additional, Kosaki, K., additional, Betsuyaku, T., additional, Kurashima, A., additional, Tettelin, H., additional, Olivier, K.N., additional, Hoshino, Y., additional, Holland, S.M., additional, Tokunaga, K., additional, Hasegawa, N., additional, and Nontuberculous Mycobacteriosis Japa, O.N.-J., additional

Published
2019
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