2,778 results on '"Hayakawa, S."'
Search Results
2. Nuclear Physics Mid Term Plan at LNGS
- Author
-
Buompane, R., Cavanna, F., Curceanu, C., D’Onofrio, A., Di Leva, A., Formicola, A., Gialanella, L., Gustavino, C., Imbriani, G., Junker, M., Marcianò, A., Marzaioli, F., Nania, R., Napolitano, F., Piscicchia, K., Straniero, O., Abia, C., Aliotta, M., Bemmerer, D., Best, A., Boeltzig, A., Bruno, C., Caciolli, A., Chieffi, A., Ciani, G., D’Agata, G., deBoer, R. J., De Cesare, M., Dell’Aquila, D., Depalo, R., Dominguez, I., Ferraro, F., Garcia Duarte, J., Guglielmetti, A., Gyürky, Gy., Hayakawa, S., La Cognata, M., Lamia, L., Marcucci, L. E., Masha, E., Mazzocco, M., Morales-Gallegos, E. L., Palmerini, S., Passariello, I., Petraglia, A., Piatti, D., Pignatari, M., Pizzone, R. G., Porzio, G., Rapagnani, D., Rapisarda, G. G., Romano, S., Rubino, M., Santonastaso, C., Sergi, M. L., Skowronski, J., Spartà, R., Terrasi, F., Tumino, A., Turkat, S., Wiescher, M., and Zavatarelli, S.
- Published
- 2024
- Full Text
- View/download PDF
3. Measurement of differential cross sections for $\Sigma^+p$ elastic scattering in the momentum range 0.44-0.80 GeV/c
- Author
-
Collaboration, J-PARC E40, Nanamura, T., Miwa, K., Ahn, J. K., Akazawa, Y., Aramaki, T., Ashikaga, S., Callier, S., Chiga, N., Choi, S. W., Ekawa, H., Evtoukhovitch, P., Fujioka, N., Fujita, M., Gogami, T., Harada, T. K., Hasegawa, S., Hayakawa, S. H., Honda, R., Hoshino, S., Hosomi, K., Ichikawa, M., Ichikawa, Y., Ieiri, M., Ikeda, M., Imai, K., Ishikawa, Y., Ishimoto, S., Jung, W. S., Kajikawa, S., Kanauchi, H., Kanda, H., Kitaoka, T., Kang, B. M., Kawai, H., Kim, S. H., Kobayashi, K., Koike, T., Matsuda, K., Matsumoto, Y., Nagao, S., Nagatomi, R., Nakada, Y., Nakagawa, M., Nakamura, I., Naruki, M., Ozawa, S., Raux, L., Rogers, T. G., Sakaguchi, A., Sakao, T., Sako, H., Sato, S., Shiozaki, T., Shirotori, K., Suzuki, K. N., Suzuki, S., Tabata, M., Taille, C. d. L., Takahashi, H., Takahashi, T., Takahashi, T. N., Tamura, H., Tanaka, M., Tanida, K., Tsamalaidze, Z., Ukai, M., Umetsu, H., Wada, S., Yamamoto, T. O., Yoshida, J., and Yoshimura, K.
- Subjects
Nuclear Experiment - Abstract
We performed a novel $\Sigma^+ p$ scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 $\Sigma^+ p$ elastic scattering events were identified from $4.9 \times 10^7$ tagged $\Sigma^+$ particles in the $\Sigma^+$ momentum range 0.44 -- 0.80 GeV/$c$. The differential cross sections of the $\Sigma^+ p$ elastic scattering were derived with much better precision than in previous experiments. The obtained differential cross sections were approximately 2 mb/sr or less, which were not as large as those predicted by the fss2 and FSS models based on the quark cluster model in the short-range region. By performing phase-shift analyses for the obtained differential cross sections, we experimentally derived the phase shifts of the $^3 S_1$ and $^1 P_1$ channels for the first time. The phase shift of the $^3 S_1$ channel, where a large repulsive core was predicted owing to the Pauli effect between quarks, was evaluated as $20^\circ<|\delta_{^3S_1}|<35^\circ$. If the sign of $\delta_{^3S_1}$ is assumed to be negative, the interaction in this channel is moderately repulsive, as the Nijmegen extended-sort-core models predicted.
- Published
- 2022
4. Precise measurement of differential cross sections of the {\Sigma}-p --> {\Lambda} n reaction in momentum range 470-650 MeV/c
- Author
-
Collaboration, J-PARC E40, Miwa, K., Ahn, J. K., Akazawa, Y., Aramaki, T., Ashikaga, S., Callier, S., Chiga, N., Choi, S. W., Ekawa, H., Evtoukhovitch, P., Fujioka, N., Fujita, M., Gogami, T., Harada, T., Hasegawa, S., Hayakawa, S. H., Honda, R., Hoshino, S., Hosomi, K., Ichikawa, M., Ichikawa, Y., Ieiri, M., Ikeda, M., Imai, K., Ishikawa, Y., Ishimoto, S., Jung, W. S., Kajikawa, S., Kanauchi, H., Kanda, H., Kitaoka, T., Kang, B. M., Kawai, H., Kim, S. H., Kobayashi, K., Koike, T., Matsuda, K., Matsumoto, Y., Nagao, S., Nagatomi, R., Nakada, Y., Nakagawa, M., Nakamura, I., Nanamura, T., Naruki, M., Ozawa, S., Raux, L., Rogers, T. G., Sakaguchi, A., Sakao, T., Sako, H., Sato, S., Shiozaki, T., Shirotori, K., Suzuki, K. N., Suzuki, S., Tabata, M., Taille, C. d. L., Takahashi, H., Takahashi, T., Takahashi, T. N., Tamura, H., Tanaka, M., Tanida, K., Tsamalaidze, Z., Ukai, M., Umetsu, H., Wada, S., Yamamoto, T. O., Yoshida, J., and Yoshimura, K.
- Subjects
Nuclear Experiment ,Nuclear Theory - Abstract
The differential cross sections of the {\Sigma}-p --> {\Lambda} n reaction were measured accurately for the {\Sigma}- momentum (p_{{\Sigma}}) ranging from 470 to 650 MeV/c at the J-PARC Hadron Experimental Facility. Precise angular information about the {\Sigma}-p --> {\Lambda} n reaction was obtained for the first time by detecting approximately 100 reaction events at each angular step of {\Delta}cos{\theta} = 0.1. The obtained differential cross sections show slightly forward-peaking structure in the measured momentum regions.The cross sections integrated for -0.7 < cos{\theta} < 1.0 were obtained as 22.5 +- 0.68 (stat.) +- 0.65 (syst.) mb and 15.8 +-0.83(stat.) +- 0.52 (syst.) mb for 470
- Published
- 2021
5. Development and application of CATCH: A cylindrical active tracker and calorimeter system for hyperon-proton scattering experiments
- Author
-
Akazawa, Y., Chiga, N., Fujioka, N., Hayakawa, S. H., Honda, R., Ikeda, M., Matsuda, K., Miwa, K., Nakada, Y., Nanamura, T., Ozawa, S., Shiozaki, T., Tamura, H., and Umetsu, H.
- Subjects
Physics - Instrumentation and Detectors ,Nuclear Experiment - Abstract
In this study, we developed a new proton detector system called CATCH, which was designed for a scattering experiment involving a $\Sigma$ hyperon and a proton (J-PARC E40). CATCH is a cylindrical detector system covering an inner target that can be used to measure the trajectory and energy of a proton emitted from the target for the kinematic identification of a $\Sigma$p scattering event. It comprises a cylindrical fiber tracker (CFT), a bismuth germanate (BGO) calorimeter, and a plastic scintillator hodoscope (PiID), which are coaxially arranged from the inner to the outer sides. The CFT is a tracking detector consisting of 5,000 scintillation fibers, and it has two types of cylindrical layers in which the fibers are arranged in straight and spiral configurations. 24 BGO crystals are placed around the CFT to measure the kinetic energy of the recoil proton. The PiID is used to determine whether the recoil proton is stopped in the BGO calorimeter. We performed proton-proton (pp) and proton-carbon (pC) scattering experiments using an 80 MeV proton beam to evaluate the performance of CATCH. The total energy resolution for the recoil proton was 2.8 MeV in $\sigma$ for the entire angular region after the energy calibrations of the BGO calorimeter and the CFT. The angular resolution of the CFT was 1.27 degrees in $\sigma$ for the proton, and the time resolution was more than 1.8 ns in $\sigma$. We also developed an analysis method for deriving the cross section of the pp scattering using CATCH. The obtained relative differential cross section for the pp elastic scattering was consistent with that obtained by reliable partial wave analysis, and the systematic error was maintained at below 10%. These performance results satisfy our requirements for a reliable detection system for the $\Sigma$p scattering experiment conducted at J-PARC .
- Published
- 2021
- Full Text
- View/download PDF
6. Advancement of Photospheric Radius Expansion and Clocked Type-I X-Ray Burst Models with the New $^{22}$Mg$(\alpha,p)^{25}$Al Reaction Rate Determined at Gamow Energy
- Author
-
Hu, J., Yamaguchi, H., Lam, Y. H., Heger, A., Kahl, D., Jacobs, A. M., Johnston, Z., Xu, S. W., Zhang, N. T., Ma, S. B., Ru, L. H., Liu, E. Q., Liu, T., Hayakawa, S., Yang, L., Shimizu, H., Hamill, C. B., Murphy, A. St J., Su, J., Fang, X., Chae, K. Y., Kwag, M. S., Cha, S. M., Duy, N. N., Uyen, N. K., Kim, D. H., Pizzone, R. G., La Cognata, M., Cherubini, S., Romano, S., Tumino, A., Liang, J., Psaltis, A., Sferrazza, M., Kim, D., Li, Y. Y., and Kubono, S.
- Subjects
Nuclear Experiment ,Astrophysics - High Energy Astrophysical Phenomena ,Nuclear Theory - Abstract
We report the first (in)elastic scattering measurement of $^{25}\mathrm{Al}+p$ with the capability to select and measure in a broad energy range the proton resonances in $^{26}$Si contributing to the $^{22}$Mg$(\alpha,p)$ reaction at type I x-ray burst energies. We measured spin-parities of four resonances above the $\alpha$ threshold of $^{26}$Si that are found to strongly impact the $^{22}$Mg$(\alpha,p)$ rate. The new rate advances a state-of-the-art model to remarkably reproduce light curves of the GS 1826$-$24 clocked burster with mean deviation $<9$ % and permits us to discover a strong correlation between the He abundance in the accreting envelope of photospheric radius expansion burster and the dominance of $^{22}$Mg$(\alpha,p)$ branch., Comment: accepted by Physical Review Letters on 5 August 2021, published 19 October 2021
- Published
- 2021
- Full Text
- View/download PDF
7. Nuclear physics midterm plan at LNS
- Author
-
Agodi, C., Cappuzzello, F., Cardella, G., Cirrone, G. A. P., De Filippo, E., Di Pietro, A., Gargano, A., La Cognata, M., Mascali, D., Milluzzo, G., Nania, R., Petringa, G., Pidatella, A., Pirrone, S., Pizzone, R. G., Rapisarda, G. G., Sergi, M. L., Tudisco, S., Valiente-Dobón, J. J., Vardaci, E., Abramczyk, H., Acosta, L., Adsley, P., Amaducci, S., Banerjee, T., Batani, D., Bellone, J., Bertulani, C., Biri, S., Bogachev, A., Bonanno, A., Bonasera, A., Borcea, C., Borghesi, M., Bortolussi, S., Boscolo, D., Brischetto, G. A., Burrello, S., Busso, M., Calabrese, S., Calinescu, S., Calvo, D., Capirossi, V., Carbone, D., Cardinali, A., Casini, G., Catalano, R., Cavallaro, M., Ceccuzzi, S., Celona, L., Cherubini, S., Chieffi, A., Ciraldo, I., Ciullo, G., Colonna, M., Cosentino, L., Cuttone, G., D’Agata, G., De Gregorio, G., Degl’Innocenti, S., Delaunay, F., Di Donato, L., Di Nitto, A., Dickel, T., Doria, D., Ducret, J. E., Durante, M., Esposito, J., Farrokhi, F., Fernandez Garcia, J. P., Figuera, P., Fisichella, M., Fulop, Z., Galatá, A., Galaviz Redondo, D., Gambacurta, D., Gammino, S., Geraci, E., Gizzi, L., Gnoffo, B., Groppi, F., Guardo, G. L., Guarrera, M., Hayakawa, S., Horst, F., Hou, S. Q., Jarota, A., José, J., Kar, S., Karpov, A., Kierzkowska-Pawlak, H., Kiss, G. G., Knyazheva, G., Koivisto, H., Koop, B., Kozulin, E., Kumar, D., Kurmanova, A., La Rana, G., Labate, L., Lamia, L., Lanza, E. G., Lay, J. A., Lattuada, D., Lenske, H., Limongi, M., Lipoglavsek, M., Lombardo, I., Mairani, A., Manetti, S., Marafini, M., Marcucci, L., Margarone, D., Martorana, N. S., Maunoury, L., Mauro, G. S., Mazzaglia, M., Mein, S., Mengoni, A., Milin, M., Mishra, B., Mou, L., Mrazek, J., Nadtochy, P., Naselli, E., Nicolai, P., Novikov, K., Oliva, A. A., Pagano, A., Pagano, E. V., Palmerini, S., Papa, M., Parodi, K., Patera, V., Pellumaj, J., Petrone, C., Piantelli, S., Pierroutsakou, D., Pinna, F., Politi, G., Postuma, I., Prajapati, P., Prada Moroni, P. G., Pupillo, G., Raffestin, D., Racz, R., Reidel, C.-A., Rifuggiato, D., Risitano, F., Rizzo, F., Roca Maza, X., Romano, S., Roso, L., Rotaru, F., Russo, A. D., Russotto, P., Saiko, V., Santonocito, D., Santopinto, E., Sarri, G., Sartirana, D., Schuy, C., Sgouros, O., Simonucci, S., Sorbello, G., Soukeras, V., Spartá, R., Spatafora, A., Stanoiu, M., Taioli, S., Tessonnier, T., Thirolf, P., Tognelli, E., Torresi, D., Torrisi, G., Trache, L., Traini, G., Trimarchi, M., Tsikata, S., Tumino, A., Tyczkowski, J., Yamaguchi, H., Vercesi, V., Vidana, I., Volpe, L., and Weber, U.
- Published
- 2023
- Full Text
- View/download PDF
8. Measurement of the differential cross sections of the Sigma-p elastic scattering in momentum range of 470 to 850 MeV/c
- Author
-
Collaboration, J-PARC E40, Miwa, K., Ahn, J. K., Akazawa, Y., Aramaki, T., Ashikaga, S., Callier, S., Chiga, N., Choi, S. W., Ekawa, H., Evtoukhovitch, P., Fujioka, N., Fujita, M., Gogami, T., Harada, T., Hasegawa, S., Hayakawa, S. H., Honda, R., Hoshino, S., Hosomi, K., Ichikawa, M., Ichikawa, Y., Ieiri, M., Ikeda, M., Imai, K., Ishikawa, Y., Ishimoto, S., Jung, W. S., Kajikawa, S., Kanauchi, H., Kanda, H., Kitaoka, T., Kang, B. M., Kawai, H., Kim, S. H., Kobayashi, K., Koike, T., Matsuda, K., Matsumoto, Y., Nagao, S., Nagatomi, R., Nakada, Y., Nakagawa, M., Nakamura, I., Nanamura, T., Naruki, M., Ozawa, S., Raux, L., Rogers, T. G., Sakaguchi, A., Sakao, T., Sako, H., Sato, S., Shiozaki, T., Shirotori, K., Suzuki, K. N., Suzuki, S., Tabata, M., Taille, C. d. L., Takahashi, H., Takahashi, T., Takahashi, T. N., Tamura, H., Tanaka, M., Tanida, K., Tsamalaidze, Z., Ukai, M., Umetsu, H., Wada, S., Yamamoto, T. O., Yoshida, J., and Yoshimura, K.
- Subjects
Nuclear Experiment - Abstract
A high statistics $\Sigma p$ scattering experiment has been performed at the J-PARC Hadron Experimental Facility. Data for momentum-tagged $\Sigma^{-}$ running in a liquid hydrogen target were accumulated by detecting the $\pi^{-}p \to K^{+}\Sigma^{-}$ reaction with a high intensity $\pi^{-}$ beam of 20 M/spill. Differential cross sections of the $\Sigma^{-}p$ elastic scattering were derived with a drastically improved accuracy by identifying the largest statistics of about 4,500 events from 1.72 $\times$ $10^{7}$ $\Sigma^{-}$. The derived differential cross section shows a clear forward-peaking angular distribution for a $\Sigma^{-}$ momentum range from 470 to 850 MeV/$c$. The accurate data will impose a strong constraint on the theoretical models of the baryon-baryon interactions.
- Published
- 2021
9. First observation of a nuclear $s$-state of $\Xi$ hypernucleus, $^{15}_{\Xi}{\rm C}$
- Author
-
Yoshimoto, M., Ahn, J. K., Bassalleck, B., Ekawa, H., Endo, Y., Fujita, M., Han, Y., Hashimoto, T., Hayakawa, S. H., Hicks, K., Hoshino, K., Hoshino, S., Hwang, S. H., Ichikawa, Y., Ichikawa, M., Imai, K., Ishikawa, Y., Kanauchi, H., Kasagi, A., Kim, S. H., Kinbara, S., Lin, P. M., Ma, T. L., Miwa, K., Moe, A. T., Nagase, Y., Nakazawa, K., Nanamura, T., Naruki, M., Nyaw, A. N. L., Pochodzalla, J., Sako, H., Sato, S., Soe, M. M., Soe, M. K., Sohn, J. Y., Takahashi, H., Takahashi, T., Tamura, H., Tanida, K., Theint, A. M. M., Tint, K. T., Ukai, M., Yamamoto, T. O., Yang, S. B., Yoon, C. S., Yoshida, J., Zhang, D. H., and Zhang, Z.
- Subjects
Nuclear Experiment ,Nuclear Theory ,Physics - Instrumentation and Detectors - Abstract
Bound-systems of $\Xi^-$--$^{14}_{}{\rm N}$ are studied via $\Xi^-$ capture at rest followed by emission of a twin single-$\Lambda$ hypernucleus in the emulsion detectors. Two events forming extremely deep $\Xi^-$ bound states were obtained by analysis of a hybrid method in the E07 experiment at J-PARC and reanalysis of the E373 experiment at KEK-PS. The decay mode of one event was assigned as $\Xi^-+^{14}_{}{\rm N}\to^{5}_{\Lambda}{\rm He}$+$^{5}_{\Lambda}{\rm He}$+$^{4}_{}{\rm He}$+n. Since there are no excited states for daughter particles, the binding energy of the $\Xi^-$ hyperon, $B_{\Xi^-}$, in $^{14}_{}{\rm N}$ nucleus was uniquely determined to be 6.27 $\pm$ 0.27 MeV. Another $\Xi^-$--$^{14}_{}{\rm N}$ system via the decay $^{9}_{\Lambda}{\rm Be}$ + $^{5}_{\Lambda}{\rm He}$ + n brings a $B_{\Xi^-}$ value, 8.00 $\pm$ 0.77 MeV or 4.96 $\pm$ 0.77 MeV, where the two possible values of $B_{\Xi^-}$ correspond to the ground and the excited states of the daughter $^{9}_{\Lambda}{\rm Be}$ nucleus, respectively. Because the $B_{\Xi^-}$ values are larger than those of the previously reported events (KISO and IBUKI), which are both interpreted as the nuclear $1p$ state of the $\Xi^-$--$^{14}_{}{\rm N}$ system, these new events give the first indication of the nuclear $1s$ state of the $\Xi$ hypernucleus, $^{15}_{\Xi}{\rm C}$., Comment: 26 pages, 7 figures
- Published
- 2021
- Full Text
- View/download PDF
10. Observation of Coulomb-assisted nuclear bound state of $\Xi^-$-$^{14}$N system
- Author
-
Hayakawa, S. H., Agari, K., Ahn, J. K., Akaishi, T., Akazawa, Y., Ashikaga, S., Bassalleck, B., Bleser, S., Ekawa, H., Endo, Y., Fujikawa, Y., Fujioka, N., Fujita, M., Goto, R., Han, Y., Hasegawa, S., Hashimoto, T., Hayakawa, T., Hayata, E., Hicks, K., Hirose, E., Hirose, M., Honda, R., Hoshino, K., Hoshino, S., Hosomi, K., Hwang, S. H., Ichikawa, Y., Ichikawa, M., Imai, K., Inaba, K., Ishikawa, Y., Ito, H., Ito, K., Jung, W. S., Kanatsuki, S., Kanauchi, H., Kasagi, A., Kawai, T., Kim, M. H., Kim, S. H., Kinbara, S., Kiuchi, R., Kobayashi, H., Kobayashi, K., Koike, T., Koshikawa, A., Lee, J. Y., Ma, T. L., Matsumoto, S. Y., Minakawa, M., Miwa, K., Moe, A. T., Moon, T. J., Moritsu, M., Nagase, Y., Nakada, Y., Nakagawa, M., Nakashima, D., Nakazawa, K., Nanamura, T., Naruki, M., Nyaw, A. N. L., Ogura, Y., Ohashi, M., Oue, K., Ozawa, S., Pochodzalla, J., Ryu, S. Y., Sako, H., Sato, S., Sato, Y., Schupp, F., Shirotori, K., Soe, M. M., Soe, M. K., Sohn, J. Y., Sugimura, H., Suzuki, K. N., Takahashi, H., Takahashi, T., Takeda, T., Tamura, H., Tanida, K., Theint, A. M. M., Tint, K. T., Toyama, Y., Ukai, M., Umezaki, E., Watabe, T., Watanabe, K., Yamamoto, T. O., Yang, S. B., Yoon, C. S., Yoshida, J., Yoshimoto, M., Zhang, D. H., and Zhang, Z.
- Subjects
Nuclear Experiment - Abstract
In an emulsion-counter hybrid experiment performed at J-PARC, a $\Xi^-$ absorption event was observed which decayed into twin single-$\Lambda$ hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as $\Xi^{-} + ^{14}$N$\ \rightarrow\ ^{10}_\Lambda$Be + $^5_\Lambda$He. For the binding energy of the $\Xi^{-}$ hyperon in the $\Xi^-$-$^{14}$N system a value of $1.27 \pm 0.21$ MeV was deduced. The energy level of $\Xi^-$ is likely a nuclear $1p$ state which indicates a weak ${\Xi}N$-$\Lambda\Lambda$ coupling.
- Published
- 2020
- Full Text
- View/download PDF
11. Meso-timescale atomistic simulations on coalescence process of He bubbles in Fe by SEAKMC method
- Author
-
Yamamoto, Y., Hayakawa, S., Okita, T., and Itakura, M.
- Published
- 2023
- Full Text
- View/download PDF
12. OEDO-SHARAQ system: Multifaceted performances in low-energy RI production and high-resolution spectroscopy
- Author
-
Michimasa, S., Chillery, T., Hwang, J.W., Sumikama, T., Hanai, S., Imai, N., Dozono, M., Ota, S., Ahn, D.S., Hayakawa, S., Hijikata, Y., Kameya, K., Kawata, K., Kojima, R., Kusaka, K., Li, J., Miki, K., Ohtake, M., Shimizu, Y., Suzuki, D., Suzuki, H., Takeda, H., Yako, K., Yanagisawa, Y., Yoshida, K., Yoshimoto, M., and Shimoura, S.
- Published
- 2023
- Full Text
- View/download PDF
13. Nuclear Astrophysics with Exotic Beam; Thick-target Measurements at CRIB
- Author
-
Yamaguchi H., Hayakawa S., Shimizu H., Okawa K., Liu F.L., Zhang Q., Ma N.R., Ahn S., Kim D., Park C.Y., Hu J., and Lam Y.H.
- Subjects
Physics ,QC1-999 - Abstract
Astrophysical reactions involving radioactive isotopes (RI) often play an important role in high-temperature stellar environments. The experimental information on those reactions is still limited mainly due to the technical difficulties in producing high-quality and intense RI beams. Although a direct measurement of those reactions at astrophysical energy would be still challenging, we may take several alternative approaches to determine the reaction rates, by applying other mesurement methods or improving the target and detectors. Here we mainly discuss the thick-target method in inverse kinematics (TTIK) based on the successful examples of experimental studies performed at Center for Nuclear Study, the University of Tokyo, using the low-energy RI beam separator CRIB.
- Published
- 2024
- Full Text
- View/download PDF
14. Observation of a Be double-Lambda hypernucleus in the J-PARC E07 experiment
- Author
-
Ekawa, H., Agari, K., Ahn, J. K., Akaishi, T., Akazawa, Y., Ashikaga, S., Bassalleck, B., Bleser, S., Endo, Y., Fujikawa, Y., Fujioka, N., Fujita, M., Goto, R., Han, Y., Hasegawa, S., Hashimoto, T., Hayakawa, S. H., Hayakawa, T., Hayata, E., Hicks, K., Hirose, E., Hirose, M., Honda, R., Hoshino, K., Hoshino, S., Hosomi, K., Hwang, S. H., Ichikawa, Y., Ichikawa, M., Ieiri, M., Imai, K., Inaba, K., Ishikawa, Y., Iskendir, A., Ito, H., Ito, K., Jung, W. S., Kanatsuki, S., Kanauchi, H., Kasagi, A., Kawai, T., Kim, M. H., Kim, S. H., Kinbara, S., Kiuchi, R., Kobayashi, H., Kobayashi, K., Koike, T., Koshikawa, A., Lee, J. Y., Lee, J. W., Ma, T. L., Matsumoto, S. Y., Minakawa, M., Miwa, K., Moe, A. T., Moon, T. J., Moritsu, M., Nagase, Y., Nakada, Y., Nakagawa, M., Nakashima, D., Nakazawa, K., Nanamura, T., Naruki, M., Nyaw, A. N. L., Ogura, Y., Ohashi, M., Oue, K., Ozawa, S., Pochodzalla, J., Ryu, S. Y., Sako, H., Sasaki, Y., Sato, S., Sato, Y., Schupp, F., Shirotori, K., Soe, M. M., Soe, M. K., Sohn, J. Y., Sugimura, H., Suzuki, K. N., Takahashi, H., Takahashi, T., Takahashi, Y., Takeda, T., Tamura, H., Tanida, K., Theint, A. M. M., Tint, K. T., Toyama, Y., Ukai, M., Umezaki, E., Watabe, T., Watanabe, K., Yamamoto, T. O., Yang, S. B., Yoon, C. S., Yoshida, J., Yoshimoto, M., Zhang, D. H., and Zhang, Z.
- Subjects
Nuclear Experiment - Abstract
A double-$\Lambda$ hypernucleus, ${}_{\Lambda\Lambda}\mathrm{Be}$, was observed by the J-PARC E07 collaboration in nuclear emulsions tagged by the $(K^{-},K^{+})$ reaction. This event was interpreted as a production and decay of $ {}_{\Lambda\Lambda}^{\;10}\mathrm{Be}$, ${}_{\Lambda\Lambda}^{\;11}\mathrm{Be}$, or ${}_{\Lambda\Lambda}^{\;12}\mathrm{Be}^{*}$ via $\Xi^{-}$ capture in ${}^{16}\mathrm{O}$. By assuming the capture in the atomic 3D state, the binding energy of two $\Lambda$ hyperons$\,$($B_{\Lambda\Lambda}$) of these double-$\Lambda$ hypernuclei are obtained to be $15.05 \pm 0.11\,\mathrm{MeV}$, $19.07 \pm 0.11\,\mathrm{MeV}$, and $13.68 \pm 0.11\,\mathrm{MeV}$, respectively. Based on the kinematic fitting, ${}_{\Lambda\Lambda}^{\;11}\mathrm{Be}$ is the most likely explanation for the observed event., Comment: 11 pages, 3 figures
- Published
- 2018
- Full Text
- View/download PDF
15. Long-timescale transformations of self-interstitial atom clusters of Cu using the SEAKMC method: The effect of setting an activation energy threshold for saddle point searches
- Author
-
Hayakawa, S., Yamamoto, Y., Okita, T., Itakura, M., and Suzuki, K.
- Published
- 2023
- Full Text
- View/download PDF
16. Molecular dynamics simulation to elucidate effects of spatial geometry on interactions between an edge dislocation and rigid, impenetrable precipitate in Cu
- Author
-
Tsugawa, K., Hayakawa, S., Okita, T., Aichi, M., Itakura, M., and Suzuki, K.
- Published
- 2022
- Full Text
- View/download PDF
17. SUITABLE MESH FOR ADULT GROIN HERNIA TEP REPAIR BASED ON PELVIC 3D-CT SCAN MEASUREMENTS
- Author
-
Zuiki, T, primary, Oki, J, additional, Ui, T, additional, and Hayakawa, S, additional
- Published
- 2024
- Full Text
- View/download PDF
18. Neutron capture reaction cross-section of 79Se through the 79Se(d,p) reaction in inverse kinematics
- Author
-
Imai, N., primary, Dozono, M., additional, Michimasa, S., additional, Sumikama, T., additional, Ota, S., additional, Hayakawa, S., additional, Hwang, J.W., additional, Iribe, K., additional, Iwamoto, C., additional, Kawase, S., additional, Kawata, K., additional, Kitamura, N., additional, Masuoka, S., additional, Nakano, K., additional, Schrock, P., additional, Suzuki, D., additional, Tsunoda, R., additional, Wimmer, K., additional, Ahn, D.S., additional, Beliuskina, O., additional, Chiga, N., additional, Fukuda, N., additional, Ideguchi, E., additional, Kusaka, K., additional, Miki, H., additional, Miyatake, H., additional, Nagae, D., additional, Ohmika, S., additional, Ohtake, M., additional, Ong, H.J., additional, Otsu, H., additional, Sakurai, H., additional, Shimizu, H., additional, Shimizu, Y., additional, Sun, X., additional, Suzuki, H., additional, Takaki, M., additional, Takeda, H., additional, Takeuchi, S., additional, Teranishi, T., additional, Watanabe, Y., additional, Watanabe, Y.X., additional, Yako, K., additional, Yamada, H., additional, Yamaguchi, H., additional, Yang, L., additional, Yanagihara, R., additional, Yanagisawa, Y., additional, Yoshida, K., additional, and Shimoura, S., additional
- Published
- 2024
- Full Text
- View/download PDF
19. Breakup of the proton halo nucleus 8B near barrier energies
- Author
-
Yang, L., Lin, C. J., Yamaguchi, H., Moro, A. M., Ma, N. R., Wang, D. X., Cook, K. J., Mazzocco, M., Wen, P. W., Hayakawa, S., Wang, J. S., Yang, Y. Y., Zhang, G. L., Huang, Z., Inoue, A., Jia, H. M., Kahl, D., Kim, A., Kwag, M. S., Commara, M. La, Gu, G. M., Okamoto, S., Parascandolo, C., Pierroutsakou, D., Shimizu, H., Sun, H. H., Wang, M. L., Yang, F., and Zhong, F. P.
- Published
- 2022
- Full Text
- View/download PDF
20. Reply to the Comments on the 12C+12C fusion S^*-factor
- Author
-
Tumino, A., Spitaleri, C., La Cognata, M., Cherubini, S., Guardo, G. L., Gulino, M., Hayakawa, S., Indelicato, I., Lamia, L., Petrascu, H., Pizzone, R. G., Puglia, S. M. R., Rapisarda, G. G., Romano, S., Sergi, M. L., Spartá, R., and Trache, L.
- Subjects
Nuclear Experiment - Abstract
The goal of this reply is to draw attention of the readers that the major problems rose in the short Comment authored by A.M. Mukhamedzhanov, X. Tang and D.Y. Pang (arXiv:1806.05921) are totally groundless., Comment: 4 pages, 2 figures
- Published
- 2018
21. Origin of crystallization suppression in a new amorphous molecular white-light-generating material
- Author
-
Klee, B.D., Paulus, B., Link Vasco, J., Hosokawa, S., Stellhorn, J.R., Hayakawa, S., Dehnen, S., and Pilgrim, W.-C.
- Published
- 2022
- Full Text
- View/download PDF
22. First Determination of Level Structure of an $sd$-Shell Hypernucleus, $\rm {^{19}_{\Lambda}F}$
- Author
-
Yang, S. B., Ahn, J. K., Akazawa, Y., Aoki, K., Chiga, N., Ekawa, H., Evtoukhovitch, P., Feliciello, A., Fujita, M., Hasegawa, S., Hayakawa, S., Hayakawa, T., Honda, R., Hosomi, K., Hwang, S. H., Ichige, N., Ichikawa, Y., Ikeda, M., Imai, K., Ishimoto, S., Kanatsuki, S., Kim, S. H., Kinbara, S., Kobayashi, K., Koike, T., Lee, J. Y., Miwa, K., Moon, T. J., Nagae, T., Nakada, Y., Nakagawa, M., Ogura, Y., Sakaguchi, A., Sako, H., Sasaki, Y., Sato, S., Shirotori, K., Sugimura, H., Suto, S., Suzuki, S., Takahashi, T., Tamura, H., Tanida, K., Togawa, Y., Tsamalaidze, Z., Ukai, M., Wang, T. F., and Yamamoto, T. O.
- Subjects
Nuclear Experiment - Abstract
We report on the first observation of $\gamma$ rays emitted from an $sd$-shell hypernucleus, $\rm ^{19}_{\Lambda}F$. The energy spacing between the ground state doublet, $1/2^{+}$ and $3/2^{+}$ states, of $\rm ^{19}_{\Lambda}F$ is determined to be $\rm 315.5 \pm 0.4 (stat) ^{+0.6}_{-0.5} (syst)~keV$ by measuring the $\gamma$-ray energy from the $M1(3/2^{+} \rightarrow 1/2^{+})$ transition. In addition, three $\gamma$-ray peaks were observed and assigned as $E2(5/2^{+} \rightarrow 1/2^{+})$, $E1(1/2^{-} \rightarrow 1/2^{+})$, and $E1(1/2^{-} \rightarrow 3/2^{+})$ transitions. The excitation energies of the $5/2^{+}$ and $1/2^{-}$ states are determined to be $\rm 895.2 \pm 0.3 (stat) \pm 0.5 (syst)~keV$ and $\rm 1265.6 \pm 1.2 (stat) ^{+0.7}_{-0.5} (syst)~keV$, respectively. It is found that the ground state doublet spacing is well described by theoretical models based on existing $s$- and $p$-shell hypernuclear data.
- Published
- 2017
- Full Text
- View/download PDF
23. Molecular dynamics simulations to quantify the interaction of a rigid and impenetrable precipitate with an edge dislocation in Cu
- Author
-
Tsugawa, K., Hayakawa, S., Iwase, Y., Okita, T., Suzuki, K., Itakura, M., and Aichi, M.
- Published
- 2022
- Full Text
- View/download PDF
24. Missing-mass spectroscopy with the ${}^{6}$Li($\pi^{-}, K^{+}$)X reaction to search for ${}^{6}_{\Lambda}$H
- Author
-
Honda, R., Agnello, M., Ahn, J. K., Ajimura, S., Akazawa, Y., Amano, N., Aoki, K., Bhang, H. C., Chiga, N., Endo, M., Evtoukhovitch, P., Feliciello, A., Fujioka, H., Fukuda, T., Hasegawa, S., Hayakawa, S. H., Hosomi, K., Hwang, S. H., Ichikawa, Y., Igarashi, Y., Imai, K., Ishibashi, N., Iwasaki, R., Joo, C. W., Kiuchi, R., Lee, J. K., Lee, J. Y., Matsuda, K., Matsumoto, Y., Matsuoka, K., Miwa, K., Mizoi, Y., Moritsu, M., Nagae, T., Nagamiya, S., Nakagawa, M., Naruki, M., Noumi, H., Ota, R., Roy, B. J., Saha, P. K., Sakaguchi, A., Sako, H., Samanta, C., Samoilov, V., Sasaki, Y., Sato, S., Sekimoto, M., Shimizu, Y., Shiozaki, T., Shirotori, K., Soyama, T., Sugimura, H., Takahashi, T., Takahashi, T. N., Tamura, H., Tanabe, K., Tanaka, T., Tanida, K., Tokiyasu, A. O., Tsamalaidze, Z., Ukai, M., Yamamoto, T. O., Yamamoto, Y., Yang, S. B., and Yoshida, K.
- Subjects
Nuclear Experiment ,Nuclear Theory - Abstract
We searched for the bound state of the neutron-rich $\Lambda$-hypernucleus ${}^{6}_{\Lambda}$H, using the ${}^{6}$Li($\pi^{-}, K^{+}$)X double charge-exchange reaction at a $\pi^{-}$ beam momentum of 1.2 GeV/c at J-PARC. A total of $1.4 \times 10^{12}$ $\pi^{-}$ was driven onto a ${}^{6}$Li target of 3.5-g/$\rm cm^2$ thickness. No event was observed below the bound threshold, i.e., the mass of ${}^{4}_{\Lambda}$H + 2n, in the missing-mass spectrum of the ${}^{6}$Li($\pi^{-}, K^{+}$)X reaction in the $2^{\circ}$ < $\theta_{\pi K}$ < $20^{\circ}$ angular range. Furthermore, no event was found up to 2.8 MeV/$c^2$ above the bound threshold. We obtained the the double-differential cross section spectra of the ${}^{6}$Li($\pi^{-}, K^{+}$)X reaction in the angular range of $2^{\circ}$ < $\theta_{\pi K}$ < $14^{\circ}$. An upper limit of 0.56 nb/sr (90% C.L.) was obtained for the production cross section of the ${}^{6}_{\Lambda}$H hypernucleus bound state. In addition, not only the bound state region, but also the $\Lambda$ continuum region and part of the $\Sigma^{-}$ quasi-free production region of the ${}^{6}$Li($\pi^{-}, K^{+}$)X reaction, were obtained with high statistics. The present missing-mass spectrum will facilitate the investigation of the $\Sigma^{-}$-nucleus optical potential for $\Sigma^{-}$-${}^{5}$He through spectrum shape analysis., Comment: 24 pages, 17 figures
- Published
- 2017
- Full Text
- View/download PDF
25. First measurement of $^{30}$S+$\alpha$ resonant elastic scattering for the $^{30}$S($\alpha$,p) reaction rate
- Author
-
Kahl, D., Yamaguchi, H., Kubono, S., Chen, A. A., Parikh, A., Binh, D. N., Chen, J., Cherubini, S., Duy, N. N., Hashimoto, T., Hayakawa, S., Iwasa, N., Jung, H. S., Kato, S., Kwon, Y. K., Nishimura, S., Ota, S., Setoodehnia, K., Teranishi, T., Tokieda, H., Yamada, T., Yun, C. C., and Zhang, L. Y.
- Subjects
Nuclear Experiment - Abstract
Background: Type I x-ray bursts are the most frequent thermonuclear explosions in the galaxy, resulting from thermonuclear runaway on the surface of an accreting neutron star. The $^{30}$S($\alpha$,p) reaction plays a critical role in burst models, yet insufficient experimental information is available to calculate a reliable, precise rate for this reaction. Purpose: Our measurement was conducted to search for states in $^{34}$Ar and determine their quantum properties. In particular, natural-parity states with large $\alpha$-decay partial widths should dominate the stellar reaction rate. Method: We performed the first measurement of $^{30}$S+$\alpha$ resonant elastic scattering up to a center-of-mass energy of 5.5 MeV using a radioactive ion beam. The experiment utilized a thick gaseous active target system and silicon detector array in inverse kinematics. Results: We obtained an excitation function for $^{30}$S($\alpha$,$\alpha$) near $150^{\circ}$ in the center-of-mass frame. The experimental data were analyzed with an $R$-Matrix calculation, and we observed three new resonant patterns between 11.1 and 12.1 MeV, extracting their properties of resonance energy, widths, spin, and parity. Conclusions: We calculated the resonant thermonuclear reaction rate of $^{30}$S($\alpha$,p) based on all available experimental data of $^{34}$Ar and found an upper limit about one order of magnitude larger than a rate determined using a statistical model. The astrophysical impact of these two rates has been investigated through one-zone postprocessing type I x-ray burst calculations. We find that our new upper limit for the $^{30}$S($\alpha$,p)$^{33}$Cl rate significantly affects the predicted nuclear energy generation rate during the burst., Comment: 16 pages, 12 figures
- Published
- 2017
- Full Text
- View/download PDF
26. Experimental investigation of a linear-chain structure in the nucleus 14C
- Author
-
Yamaguchi, H., Kahl, D., Hayakawa, S., 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., and Lee, C. S.
- Subjects
Nuclear Experiment ,Nuclear Theory - Abstract
It is a well-known fact that a cluster of nucleons can be formed in the interior of an atomic nucleus, and such clusters may occupy molecular-like orbitals, showing characteristics similar to normal molecules consisting of atoms. Chemical molecules having a linear alignment are commonly seen in nature, such as carbon dioxide. A similar linear alignment of the nuclear clusters, referred to as linear-chain cluster state (LCCS), has been studied since the 1950s, however, up to now there is no clear experimental evidence demonstrating the existence of such a state. Recently, it was proposed that an excess of neutrons may offer just such a stabilizing mechanism, revitalizing interest in the nuclear LCCS, specifically with predictions for their emergence in neutron-rich carbon isotopes. Here we present the experimental observation of {\alpha}-cluster states in the radioactive 14C nucleus. Using the 10Be+{\alpha} resonant scattering method with a radioactive beam, we observed a series of levels which completely agree with theoretically predicted levels having an explicit linear-chain cluster configuration. We regard this as the first strong indication of the linear-chain clustered nucleus., Comment: 15 pages, 3 figures
- Published
- 2016
- Full Text
- View/download PDF
27. First direct measurement of the $^{11}$C($\alpha$, p)$^{14}$N stellar reaction by an extended thick-target method
- Author
-
Hayakawa, S., Kubono, S., Kahl, D., Yamaguchi, H., Binh, D. N., Hashimoto, T., Wakabayashi, Y., He, J. J., Iwasa, N., Kato, S., Komatsubara, T., Kwon, Y. K., and Teranishi, T.
- Subjects
Nuclear Experiment - Abstract
The $^{11}$C($\alpha$, p) reaction is an important $\alpha$-induced reaction competing with $\beta$-limited hydrogen-burning processes in high-temperature explosive stars. We directly measured its reaction cross sections both for the ground-state transition ($\alpha$, $p_{0}$) and the excited-state transitions ($\alpha$, $p_{1}$) and ($\alpha$, $p_{2}$) at relevant stellar energies 1.3 - 4.5 MeV by an extended thick-target method featuring time of flight for the first time. We revised the reaction rate by numerical integration including the ($\alpha$, $p_{1}$) and ($\alpha$, $p_{2}$) contributions and also low-lying resonances of ($\alpha$, $p_{0}$) using both the present and the previous experimental data which were totally neglected in the previous compilation works. The present total reaction rate lies between the previous ($\alpha$, $p_{0}$) rate and the total rate of the Hauser-Feshbach statistical model calculation, which is consistent with the relevant explosive hydrogen-burning scenarios such as the $\nu p$-process., Comment: 8 pages, 8 figures, final version as submitted to Physical Review C for publication after peer-review
- Published
- 2016
- Full Text
- View/download PDF
28. Observation of Spin-Dependent Charge Symmetry Breaking in $\Lambda N$ Interaction: Gamma-Ray Spectroscopy of $^4_{\Lambda }$He
- Author
-
Yamamoto, T. O., Agnello, M., Akazawa, Y., Amano, N., Aoki, K., Botta, E., Chiga, N., Ekawa, H., Evtoukhovitch, P., Feliciello, A., Fujita, M., Gogami, T., Hasegawa, S., Hayakawa, S. H., Hayakawa, T., Honda, R., Hosomi, K., Hwang, S . H., Ichige, N., Ichikawa, Y., Ikeda, M., Imai, K., Ishimoto, S., Kanatsuki, S., Kim, M. H., Kim, S. H., Kinbara, S., Koike, T., Lee, J . Y., Marcello, S., Miwa, K., Moon, T., Nagae, T., Nagao, S., Nakada, Y., Nakagawa, M., Ogura, Y., Sakaguchi, A., Sako, H., Sasaki, Y., Sato, S., Shiozaki, T., Shirotori, K., Sugimura, H., Suto, S., Suzuki, S., Takahashi, T., Tamura, H., Tanabe, K., Tanida, K., Tsamalaidze, Z., Ukai, M., Yamamoto, Y., and Yang, S. B.
- Subjects
Nuclear Experiment ,Nuclear Theory - Abstract
The energy spacing between the ground-state spin doublet of $^4_\Lambda $He(1$^+$,0$^+$) was determined to be $1406 \pm 2 \pm 2$ keV, by measuring $\gamma$ rays for the $1^+ \to 0^+$ transition with a high efficiency germanium detector array in coincidence with the $^4$He$(K^-,\pi^-)$ $^4_\Lambda $He reaction at J-PARC. In comparison to the corresponding energy spacing in the mirror hypernucleus $^4_\Lambda $H, the present result clearly indicates the existence of charge symmetry breaking (CSB) in $\Lambda N$ interaction. It is also found that the CSB effect is large in the $0^+$ ground state but is by one order of magnitude smaller in the $1^+$ excited state, demonstrating that the $\Lambda N$ CSB interaction has spin dependence.
- Published
- 2015
- Full Text
- View/download PDF
29. First application of the Trojan Horse Method with a Radioactive Ion Beam: study of the $^{18}$F($p,{\alpha}$)$^{15}$O}} reaction at astrophysical energies
- Author
-
Cherubini, S., Gulino, M., Spitaleri, C., Rapisarda, G. G., La Cognata, M., Lamia, L., Pizzone, R. G., Romano, S., Kubono, S., Yamaguchi, H., Hayakawa, S., Wakabayashi, Y., Iwasa, N., Kato, S., Komatsubara, T., Teranishi, T., Coc, A., de Séréville, N., Hammache, F., Kiss, G., Bishop, S., and Binh, D. N.
- Subjects
Nuclear Experiment - Abstract
Measurement of nuclear cross sections at astrophysical energies involving unstable species is one of the most challenging tasks in experimental nuclear physics. The use of indirect methods is often unavoidable in this scenario. In this paper the Trojan Horse Method is applied for the first time to a radioactive ion beam induced reaction studying the $^{18}$F($p,{\alpha}$)$^{15}$O process at low energies relevant to astrophysics via the three body reaction $^{2}$H($^{18}$F,${\alpha}^{15}$O)n. The knowledge of the $^{18}$F($p, {\alpha}$)$^{15}$O reaction rate is crucial to understand the nova explosion phenomena. The cross section of this reaction is characterized by the presence of several resonances in $^{19}$Ne and possibly interference effects among them. The results reported in Literature are not satisfactory and new investigations of the $^{18}$F($p,{\alpha}$)$^{15}$O reaction cross section will be useful. In the present work the spin-parity assignments of relevant levels have been discussed and the astrophysical S-factor has been extracted considering also interference effects, Comment: 7 pages, 4 figures
- Published
- 2015
- Full Text
- View/download PDF
30. Determination of the 3He(α, γ)7Be and 6Li(p, γ)7Be astrophysical factors down to zero energy using the asymptotic normalization coefficients
- Author
-
La Cognata M., Kiss G. G., Yarmukhamedov R., Tursunmakhatov K. I., Wiedenhöver I., Baby L. T., Cherubini S., Cvetinović A., D’Agata G., Figuera P., Guardo G.L., Gulino M., Hayakawa S., Indelicato I., Lamia L., Lattuada M., Mudò F., Palmerini S., Pizzone R.G., Rapisarda G.G., Romano S., Sergi M. L., Spartà R., Spitaleri C., Trippella O., Tumino A., Anastasiou M., Kuvin S. A., Rijal N., Schmidt B., Igamov S. B., Sakuta S. B., Fülöp Zs., Gyürky Gy., Szücs T., Halász Z., Somorjai E., Hons Z., Mrázek J., Tribble R. E., and Mukhamedzhanov A. M.
- Subjects
Physics ,QC1-999 - Abstract
The p - p-chain reaction 3He(α, γ)7Be can sensitively influence the prediction of the 7Be and 8B neutrino fluxes. Despite its importance, the knowledge of its reaction cross section at energies of the core of the Sun (15 keV 30 keV) is limited and the accuracy far from the desired 3% level. In the present paper the indirect measurement of the external capture contribution using the asymptotic normalization coefficient (ANC) technique is reported. The angular distributions of deuterons emitted in the 6Li(3He,d)7Be α-transfer reactions were measured and the ANCs extracted from the scaling of distorted-wave Born approximation (DWBA) and coupled-channel (CC) calculations. Then, the astrophysical S-factor for the 3He(α, γ)7Be reaction was calculated assuming E1 direct capture and the zero energy value turned out to be 0.534 0.025 keVb. Both our experimental and theoretical approaches were benchmarked through the analysis of the 6Li(p,γ)7Be astrophysical factor, with interesting astrophysical applications to the understanding of the primordial lithium problem. In particular, the present work disfavors the occurrence of a claimed 200 keV resonance in the astrophysical factor.
- Published
- 2023
- Full Text
- View/download PDF
31. RIB induced reactions: Studying astrophysical reactions with low-energy RI beam at CRIB
- Author
-
Yamaguchi H., Hayakawa S., Ma N.R., Shimizu H., Okawa K., Zhang Q., Yang L., Kahl D., La Cognata M., Lamia L., Abe K., Beliuskina O., Cha S.M., Chae K.Y., Cherubini S., Figuera P., Ge Z., Gulino M., Hu J., Inoue A., Iwasa N., Kim A., Kim D., Kiss G., Kubono S., La Commara M., Lattuada M., Lee E.J., Moon J.Y., Palmerini S., Parascandolo C., Park S.Y., Phong V.H., Pierroutsakou D., Pizzone R.G., Rapisarda G.G., Romano S., Spitaleri C., Tang X.D., Trippella O., Tumino A., Zhang N.T., Lam Y.H., Heger A., Jacobs A.M., Xu S.W., Ma S.B., Ru L.H., Liu E.Q., Liu T., Hamill C.B., Murphy A. St J., Su J., Fang X., Kwag M.S., Duy N.N., Uyen N.K., Kim D.H., Liang J., Psaltis A., Sferrazza M., Johnston Z., and Li Y.Y.
- Subjects
Physics ,QC1-999 - Abstract
Astrophysical reactions involving radioactive isotopes (RI) often play an important role in high-temperature stellar environments. The experimental studies on the reaction rates for those are still limited mainly due to the technical difficulties in producing high-quality RI beams. A direct measurement of those reactions would be still challenging in many cases, however, we can make a reliable evaluation of the reaction rates by an indirect method or by studying the resonance prorerties. Here we ntroduce recent examples of experimental studies on such RI-involving astrophysical reactions, performed at Center for Nuclear Study, the University of Tokyo, using the low-energy RI beam separator CRIB. One is for the neutron-induced destruction reactions of 7Be in the Big-Bang nucleosynthesis, and the other is the study on the 22Mg(α, p) reaction relevant in X-ray bursts, which was performed with the resonant scattering method from the inverse reaction channel.
- Published
- 2023
- Full Text
- View/download PDF
32. Study on Explosive Nucleosynthesis with Low-Energy RI Beams at CRIB
- Author
-
CRIB Collaboration, Yamaguchi, H., Hayakawa, S., Yang, L., Shimizu, H., Kahl, D., Formicola, Alba, editor, Junker, Matthias, editor, Gialanella, Lucio, editor, and Imbriani, Gianluca, editor
- Published
- 2019
- Full Text
- View/download PDF
33. The Cosmologically Relevant He Reaction in View of the Recent THM Investigations
- Author
-
Lamia, L., Spitaleri, C., Mazzocco, M., Hayakawa, S., Bertulani, C. A., Boiano, A., Boiano, C., Broggini, Carlo, Caciolli, Antonio, Depalo, Rosanna, Galtarossa, F., Guardo, G. L., Gulino, M., Kubono, S., La Cognata, M., La Commara, M., La Rana, G., Lattuada, M., Menegazzo, Roberto, Pakou, A., Parascandolo, C., Piatti, D., Pierroutsakou, D., Pizzone, Rosario Gianluca, Romano, S., Rapisarda, G. G., Sergi, M. L., Sgouros, O., Soramel, F., Soukeras, V., Strano, E., Torresi, D., Tumino, Aurora, Yamaguchi, H., Villante, F. L., Zhang, G. L., Formicola, Alba, editor, Junker, Matthias, editor, Gialanella, Lucio, editor, and Imbriani, Gianluca, editor
- Published
- 2019
- Full Text
- View/download PDF
34. Cross Section Measurements of the 7Be(n,p)7Li and the 7Be(n,α)4He Reactions Covering the Big-Bang Nucleosynthesis Energy Range by the Trojan Horse Method at CRIB
- Author
-
Hayakawa, S., Abe, K., Beliuskina, O., Cha, S. M., Chae, K. Y., Cherubini, S., Figuera, P., Ge, Z., Gulino, M., Hu, J., Inoue, A., Iwasa, N., Kahl, D., Kim, A., Kim, D. H., Kiss, G. G., Kubono, S., La Cognata, M., La Commara, M., Lamia, L., Lattuada, M., Lee, E. J., Moon, J. Y., Palmerini, Sara, Parascandolo, C., Park, S. Y., Pierroutsakou, D., Pizzone, Rosario Gianluca, Rapisarda, G. G., Romano, S., Shimizu, H., Spitaleri, C., Tang, Xiaodong, Trippella, O., Tumino, Aurora, Vi, P., Yamaguchi, H., Yang, L., Zhang, N. T., Formicola, Alba, editor, Junker, Matthias, editor, Gialanella, Lucio, editor, and Imbriani, Gianluca, editor
- Published
- 2019
- Full Text
- View/download PDF
35. First Time Measurement of the O Reaction at Astrophysical Energies: Evidence of Resonances Through the Application of the Trojan Horse Method
- Author
-
Becherini, B., La Cognata, M., Palmerini, Sara, Trippella, O., Cherubini, S., Guardo, G. L., Gulino, M., Hayakawa, S., Indelicato, I., Lamia, L., Pizzone, Rosario Gianluca, Rapisarda, G. G., Spitaleri, C., Tumino, Aurora, Formicola, Alba, editor, Junker, Matthias, editor, Gialanella, Lucio, editor, and Imbriani, Gianluca, editor
- Published
- 2019
- Full Text
- View/download PDF
36. The Resonant Behaviour of the C Fusion Cross Section at Astrophysical Energies
- Author
-
Tumino, Aurora, Spitaleri, C., La Cognata, M., Cherubini, S., Guardo, G. L., Gulino, M., Hayakawa, S., Indelicato, I., Lamia, L., Petrascu, H., Pizzone, Rosario Gianluca, Puglia, S. M. R., Rapisarda, G. G., Romano, S., Sergi, M. L., Spartá, R., Trache, L., Formicola, Alba, editor, Junker, Matthias, editor, Gialanella, Lucio, editor, and Imbriani, Gianluca, editor
- Published
- 2019
- Full Text
- View/download PDF
37. 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
- Full Text
- View/download PDF
38. Multi-Institutional Fact-Finding Study: Association between Geriatric Assessment and Reduction in Intensity of Radiotherapy for Elderly Cancer Patients without Metastasis
- Author
-
Murofushi, K., primary, Kuribayashi, S., additional, Ohnishi, K., additional, Hayakawa, S., additional, Tsuchida, K., additional, Inoue, Y., additional, Ohkawa, A., additional, Ishida, T., additional, Machitori, Y., additional, Nakai, K., additional, and Takizawa, D., additional
- Published
- 2023
- Full Text
- View/download PDF
39. High-resolution search for the $\Theta^{+}$ pentaquark via a pion-induced reaction at J-PARC
- Author
-
Collaboration, J-PARC E19, Moritsu, M., Adachi, S., Agnello, M., Ajimura, S., Aoki, K., Bhang, H. C., Bassalleck, B., Botta, E., Bufalino, S., Chiga, N., Ekawa, H., Evtoukhovitch, P., Feliciello, A., Fujioka, H., Hayakawa, S., Hiruma, F., Honda, R., Hosomi, K., Ichikawa, Y., Ieiri, M., Igarashi, Y., Imai, K., Ishibashi, N., Ishimoto, S., Itahashi, K., Iwasaki, R., Joo, C. W., Kanatsuki, S., Kim, M. J., Kim, S. J., Kiuchi, R., Koike, T., Komatsu, Y., Kulikov, V. V., Marcello, S., Masumoto, S., Matsumoto, Y., Matsuoka, K., Miwa, K., Nagae, T., Naruki, M., Niiyama, M., Noumi, H., Nozawa, Y., Ota, R., Ozawa, K., Saito, N., Sakaguchi, A., Sako, H., Samoilov, V., Sato, M., Sato, S., Sato, Y., Sawada, S., Sekimoto, M., Shirotori, K., Sugimura, H., Suzuki, S., Takahashi, H., Takahashi, T., Takahashi, T. N., Tamura, H., Tanaka, T., Tanida, K., Tokiyasu, A. O., Tomida, N., Tsamalaidze, Z., Ukai, M., Yagi, K., Yamamoto, T. O., Yang, S. B., Yonemoto, Y., Yoon, C. J., and Yoshida, K.
- Subjects
Nuclear Experiment ,High Energy Physics - Experiment ,Nuclear Theory - Abstract
The pentaquark $\Theta^+$ has been searched for via the $\pi^-p \to K^-X$ reaction with beam momenta of 1.92 and 2.01 GeV/$c$ at J-PARC. A missing mass resolution of 2 MeV (FWHM) was achieved but no sharp peak structure was observed. The upper limits on the production cross section averaged over the scattering angle from 2$^{\circ}$ to 15$^{\circ}$ in the laboratory frame were found to be less than 0.28 $\mu$b/sr at the 90\% confidence level for both the 1.92- and 2.01-GeV/$c$ data. The systematic uncertainty of the upper limits was controlled within 10\%. Constraints on the $\Theta^+$ decay width were also evaluated with a theoretical calculation using effective Lagrangian. The present result implies that the width should be less than 0.36 and 1.9 MeV for the spin-parity of $1/2^+$ and $1/2^-$, respectively., Comment: 12 pages, 9 figures; published version
- Published
- 2014
- Full Text
- View/download PDF
40. Investigation of thermonuclear $^{18}$Ne($\alpha$,$p$)$^{21}$Na rate via resonant elastic scattering of $^{21}$Na+$p$
- Author
-
Zhang, L. Y., He, J. J., Parikh, A., Xu, S. W., Yamaguchi, H., Kahl, D., Kubono, S., Mohr, P., Hu, J., Ma, P., Chen, S. Z., Wakabayashi, Y., Wang, H. W., Tian, W. D., Chen, R. F., Guo, B., Hashimoto, T., Togano, Y., Hayakawa, S., Teranishi, T., Iwasa, N., Yamada, T., Komatsubara, T., Zhang, Y. H., and Zhou, X. H.
- Subjects
Astrophysics - Solar and Stellar Astrophysics ,Nuclear Experiment - Abstract
The $^{18}$Ne($\alpha$,$p$)$^{21}$Na reaction is thought to be one of the key breakout reactions from the hot CNO cycles to the rp-process in type I x-ray bursts. In this work, the resonant properties of the compound nucleus $^{22}$Mg have been investigated by measuring the resonant elastic scattering of $^{21}$Na+$p$. An 89 MeV $^{21}$Na radioactive beam delivered from the CNS Radioactive Ion Beam Separator bombarded an 8.8 mg/cm$^2$ thick polyethylene (CH$_{2}$)$_{n}$ target. The $^{21}$Na beam intensity was about 2$\times$10$^{5}$ pps, with a purity of about 70% on target. The recoiled protons were measured at the center-of-mass scattering angles of $\theta_{c.m.}$$\approx$175.2${^\circ}$, 152.2${^\circ}$, and 150.5${^\circ}$ by three sets of $\Delta E$-$E$ telescopes, respectively. The excitation function was obtained with the thick-target method over energies $E_x$($^{22}$Mg)=5.5--9.2 MeV. In total, 23 states above the proton-threshold in $^{22}$Mg were observed, and their resonant parameters were determined via an $R$-matrix analysis of the excitation functions. We have made several new $J^{\pi}$ assignments and confirmed some tentative assignments made in previous work. The thermonuclear $^{18}$Ne($\alpha$,$p$)$^{21}$Na rate has been recalculated based on our recommended spin-parity assignments. The astrophysical impact of our new rate has been investigated through one-zone postprocessing x-ray burst calculations. We find that the $^{18}$Ne($\alpha$,$p$)$^{21}$Na rate significantly affects the peak nuclear energy generation rate, reaction fluxes, as well as the onset temperature of this breakout reaction in these astrophysical phenomena.
- Published
- 2014
- Full Text
- View/download PDF
41. Search for $^6_\Lambda$H hypernucleus by the $^6$Li$(\pi^-,K^+)$ reaction at $p_{\pi^-}$ = 1.2 GeV/$c$
- Author
-
Sugimura, H., Agnello, M., Ahn, J. K., Ajimura, S., Akazawa, Y., Amano, N., Aoki, K., Bhang, H. C., Chiga, N., Endo, M., Evtoukhovitch, P., Feliciello, A., Fujioka, H., Fukuda, T., Hasegawa, S., Hayakawa, S., Honda, R., Hosomi, K., Hwang, S. H., Ichikawa, Y., Igarashi, Y., Imai, K., Ishibashi, N., Iwasaki, R., Joo, C. W., Kiuchi, R., Lee, J. K., Lee, J. Y., Matsuda, K., Matsumoto, Y., Matsuoka, K., Miwa, K., Mizoi, Y., Moritsu, M., Nagae, T., Nagamiya, S., Nakagawa, M., Naruki, M., Noumi, H., Ota, R., Roy, B. J., Saha, P. K., Sakaguchi, A., Sako, H., Samanta, C., Samoilov, V., Sasaki, Y., Sato, S., Sekimoto, M., Shimizu, Y., Shiozaki, T., Shirotori, K., Soyama, T., Takahashi, T., Takahashi, T. N., Tamura, H., Tanabe, K., Tanaka, T., Tanida, K., Tokiyasu, A. O., Tsamalaidze, Z., Ukai, M., Yamamoto, T. O., Yamamoto, Y., Yang, S. B., and Yoshida, K.
- Subjects
Nuclear Experiment - Abstract
We have carried out an experiment to search for a neutron-rich hypernucleus, $^6_{\Lambda}$H, by the $^6$Li($\pi^-,K^+$) reaction at $p_{\pi^-}$ =1.2 GeV/$c$. The obtained missing mass spectrum with an estimated energy resolution of 3.2 MeV (FWHM) showed no peak structure corresponding to the $^6_{\Lambda}$H hypernucleus neither below nor above the $^4_{\Lambda}$H$+2n$ particle decay threshold. An upper limit of the production cross section for the bound $^6_{\Lambda}$H hypernucleus was estimated to be 1.2 nb/sr at 90% confidence level., Comment: 6 pages, 5 figures, published version
- Published
- 2013
- Full Text
- View/download PDF
42. The 27Al(p,α)24Mg2H(27Al,α24Mg)n reaction at astrophysical energies studied by means of the Trojan Horse Method applied to the 27Al(p,α)24Mg2H(27Al,α24Mg)n reaction
- Author
-
Palmerini, S., La Cognata, M., Hammache, F., Acosta, L., Alba, R., Burjan, V., Chávez, E., Cherubini, S., Cvetinović, A., D’Agata, G., de Séréville, N., Di Pietro, A., Figuera, P., Fülöp, Z., Gaitán De Los Rios, K., Guardo, G. L., Gulino, M., Hayakawa, S., Kiss, G. G., La Commara, M., Lamia, L., Maiolino, C., Manicó, G., Matei, C., Mazzocco, M., Mrazek, J., Parascandolo, T., Petruse, T., Pierroutsakou, D., Pizzone, R. G., Rapisarda, G. G., Romano, S., Santonocito, D., Sergi, M. L., Spartà, R., Tumino, A., and Yamaguchi, H.
- Published
- 2021
- Full Text
- View/download PDF
43. Assessment of QRS Detection on Noisy ECG Signal Using Threshold-based Method
- Author
-
Fariha, M. A. Z., primary, Ikeura, R., additional, Hayakawa, S., additional, and Tsutsumi, S., additional
- Published
- 2021
- Full Text
- View/download PDF
44. The 18Ne(a,p)21Na breakout reaction in x-ray bursts: experimental determination of spin-parities for alpha resonances in 22Mg via resonant elastic scattering of 21Na+p
- Author
-
He, J. J., Zhang, L. Y., Parikh, A., Xu, S. W., Yamaguchi, H., Kahl, D., Kubono, S., Hu, J., Ma, P., Chen, S. Z., Wakabayashi, Y., Sun, B. H., Wang, H. W., Tian, W. D., Chen, R. F., Guo, B., Hashimoto, T., Togano, Y., Hayakawa, S., Teranishi, T., Iwasa, N., Yamada, T., and Komatsubara, T.
- Subjects
Astrophysics - Solar and Stellar Astrophysics ,Nuclear Experiment - Abstract
The $^{18}$Ne($\alpha$,$p$)$^{21}$Na reaction provides a pathway for breakout from the hot CNO cycles to the $rp$-process in type I x-ray bursts. To better determine this astrophysical reaction rate, the resonance parameters of the compound nucleus $^{22}$Mg have been investigated by measuring the resonant elastic scattering of $^{21}$Na+$p$. An 89 MeV $^{21}$Na radioactive ion beam was produced at the CNS Radioactive Ion Beam Separator and bombarded an 8.8 mg/cm$^2$ thick polyethylene target. The recoiled protons were measured at scattering angles of $\theta_{c.m.}$$\approx 175 {^\circ}$ and 152${^\circ}$ by three $\Delta E$-$E$ silicon telescopes. The excitation function was obtained with a thick-target method over energies $E_x$($^{22}$Mg)=5.5--9.2 MeV. The resonance parameters have been determined through an $R$-matrix analysis. For the first time, the $J^{\pi}$ values for ten states above the alpha threshold in $^{22}$Mg have been experimentally determined in a single consistent measurement. We have made three new $J^{\pi}$ assignments and confirmed seven of the ten tentative assignments in the previous work. The $^{18}$Ne($\alpha$,$p$)$^{21}$Na reaction rate has been recalculated, and the astrophysical impact of our new rate has been investigated through one-zone postprocessing x-ray burst calculations. We find that the $^{18}$Ne($\alpha$,$p$)$^{21}$Na rate significantly affects the peak nuclear energy generation rate and the onset temperature of this breakout reaction in these phenomena., Comment: 6 pages, 4 figures
- Published
- 2013
- Full Text
- View/download PDF
45. Alpha-resonance structure in $^{11}$C studied via resonant scattering of $^{7}$Be+$\alpha$ and $^{7}$Be($\alpha$, $p$) reaction
- Author
-
Yamaguchi, H., Kahl, D., Wakabayashi, Y., Kubono, S., Hashimoto, T., Hayakawa, S., Kawabata, T., Iwasa, N., Teranishi, T., Kwon, Y. K., Binh, D. N., Khiem, L. H., and Duy, N. N.
- Subjects
Nuclear Experiment - Abstract
The resonance structure in $^{11}$C is particularly of interest with regard to the astrophysical $^{7}$Be($\alpha$, $\gamma$) reaction, relevant at high temperature, and to the $\alpha$-cluster structure in $^{11}$C. The measurement was to determine unknown resonance parameters for the high excited states of $^{11}$C. In particular, the $\alpha$ decay width can be useful information to discuss $\alpha$ cluster structure in $^{11}$C. New measurements of the $^{7}$Be+$\alpha$ resonant scattering and the $^{7}$Be($\alpha$, $p$)$^{10}$B reaction in inverse kinematics were performed for center-of-mass energy up to 5.5 MeV, and the resonances at excitation energies of 8.9--12.7 MeV in the compound $^{11}$C nucleus were studied. Inelastic scattering of $^{7}$Be+$\alpha$ and the $^{7}$Be($\alpha$, $p_1$)$^{10}$B$^*$ reaction were also studied with a simultaneous $\gamma$-ray measurement. The measurements were performed at the low-energy RI beam facility CRIB (CNS Radioactive Ion Beam separator) of the Center for Nuclear Study (CNS), the University of Tokyo. We obtained excitation functions of $^{7}$Be($\alpha$, $\alpha_0$)$^{7}$Be (elastic scattering), $^{7}$Be($\alpha$, $\alpha_1$)$^{7}$Be$^*$ (inelastic scattering), $^{7}$Be($\alpha$, $p_0$)$^{10}$B, and $^{7}$Be($\alpha$, $p_1$)$^{10}$B$^*$. Many resonances including a new one were observed and their parameters were determined by an R-matrix analysis. The resonances we observed possibly enhance the $^{7}$Be($\alpha$, $\gamma$) reaction rate but in a smaller magnitude than the lower-lying resonances. A new negative-parity cluster band, similar to the one previously suggested in the mirror nucleus $^{11}$B, is proposed.
- Published
- 2012
- Full Text
- View/download PDF
46. Determination of astrophysical 12N(p,g)13O reaction rate from the 2H(12N, 13O)n reaction and its astrophysical implications
- Author
-
Guo, B., Su, J., Li, Zhihong, Wang, Y. B., Yan, S. Q., Li, Y. J., Shu, N. C., Han, Y. L., Bai, X. X., Chen, Y. S., Liu, W. P., Yamaguchi, H., Binh, D. N., Hashimoto, T., Hayakawa, S., Kahl, D., Kubono, S., He, J. J., Hu, J., Xu, S. W., Iwasa, N., Kume, N., and Li, Zhihuan
- Subjects
Nuclear Experiment - Abstract
The evolution of massive stars with very low-metallicities depends critically on the amount of CNO nuclides which they produce. The $^{12}$N($p$,\,$\gamma$)$^{13}$O reaction is an important branching point in the rap-processes, which are believed to be alternative paths to the slow 3$\alpha$ process for producing CNO seed nuclei and thus could change the fate of massive stars. In the present work, the angular distribution of the $^2$H($^{12}$N,\,$^{13}$O)$n$ proton transfer reaction at $E_{\mathrm{c.m.}}$ = 8.4 MeV has been measured for the first time. Based on the Johnson-Soper approach, the square of the asymptotic normalization coefficient (ANC) for the virtual decay of $^{13}$O$_\mathrm{g.s.}$ $\rightarrow$ $^{12}$N + $p$ was extracted to be 3.92 $\pm$ 1.47 fm$^{-1}$ from the measured angular distribution and utilized to compute the direct component in the $^{12}$N($p$,\,$\gamma$)$^{13}$O reaction. The direct astrophysical S-factor at zero energy was then found to be 0.39 $\pm$ 0.15 keV b. By considering the direct capture into the ground state of $^{13}$O, the resonant capture via the first excited state of $^{13}$O and their interference, we determined the total astrophysical S-factors and rates of the $^{12}$N($p$,\,$\gamma$)$^{13}$O reaction. The new rate is two orders of magnitude slower than that from the REACLIB compilation. Our reaction network calculations with the present rate imply that $^{12}$N($p,\,\gamma$)$^{13}$O will only compete successfully with the $\beta^+$ decay of $^{12}$N at higher ($\sim$two orders of magnitude) densities than initially predicted., Comment: 8 figures, 2 tables, Submitted to Physical Review C
- Published
- 2012
- Full Text
- View/download PDF
47. Trojan Horse method and radioactive ion beams: study of $^{18}$F(p,$\alpha$)$^{15}$O reaction at astrophysical energies
- Author
-
Gulino, M., Cherubini, S., Rapisarda, G. G., Kubono, S., Lamia, L., La Cognata, M., Yamaguchi, H., Hayakawa, S., Wakabayashi, Y., Iwasa, N., Kato, S., Komatsubara, H., Teranishi, T., Coc, A., De Séréville, N., Hammache, F., and Spitaleri, C.
- Subjects
Nuclear Experiment ,Astrophysics - Solar and Stellar Astrophysics - Abstract
The Trojan Horse Method was applied for the first time to a Radioactive Ion Beam induced reaction to study the reaction $^{18}$F(p,$\alpha$)$^{15}$O via the three body reaction $^{18}$F(d,$\alpha$ $^{15}$O)n at the low energies relevant for astrophysics. The abundance of $^{18}$F in Nova explosions is an important issue for the understanding of this astrophysical phenomenon. For this reason it is necessary to study the nuclear reactions that produce or destroy $^{18}$F in Novae. $^{18}$F(p,$\alpha$)$^{15}$O is one of the main $^{18}$F destruction channels. Preliminary results are presented in this paper., Comment: Talk given by Marisa Gulino at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS)
- Published
- 2012
- Full Text
- View/download PDF
48. Structural evolution in the neutron-rich nuclei 106Zr and 108Zr
- Author
-
Sumikama, T., Yoshinaga, K., Watanabe, H., Nishimura, S., Miyashita, Y., Yamaguchi, K., Sugimoto, K., Chiba, J., Li, Z., Baba, H., Berryman, J. S., Blasi, N., Bracco, A., Camera, F., Doornenbal, P., Go, S., Hashimoto, T., Hayakawa, S., Hinke, C., Ideguchi, E., Isobe, T., Ito, Y., Jenkins, D. G., Kawada, Y., Kobayashi, N., Kondo, Y., Krücken, R., Kubono, S., Lorusso, G., Nakano, T., Kurata-Nishimura, M., Odahara, A., Ong, H. J., Ota, S., Podolyák, Zs., Sakurai, H., Scheit, H., Steiger, K., Steppenbeck, D., Takano, S., Takashima, A., Tajiri, K., Teranishi, T., Wakabayashi, Y., Walker, P. M., Wieland, O., and Yamaguchi, H.
- Subjects
Nuclear Experiment - Abstract
The low-lying states in 106Zr and 108Zr have been investigated by means of {\beta}-{\gamma} and isomer spectroscopy at the RI beam factory, respectively. A new isomer with a half-life of 620\pm150 ns has been identified in 108Zr. For the sequence of even-even Zr isotopes, the excitation energies of the first 2+ states reach a minimum at N = 64 and gradually increase as the neutron number increases up to N = 68, suggesting a deformed sub-shell closure at N = 64. The deformed ground state of 108Zr indicates that a spherical sub-shell gap predicted at N = 70 is not large enough to change the ground state of 108Zr to the spherical shape. The possibility of a tetrahedral shape isomer in 108Zr is also discussed., Comment: 10 pages, 3 figures, Accepted for publication in Phys. Rev. Lett
- Published
- 2011
- Full Text
- View/download PDF
49. 30S(alpha,p) in X-Ray Bursts at CRIB
- Author
-
Kahl, D., Chen, A. A., Kubono, S., Binh, D. N., Chen, J., Hashimoto, T., Hayakawa, S., Kaji, D., Kim, A., Kurihara, Y., Lee, N. H., Nishimura, S., Ohshiro, Y., nia, K. Setoodeh, Wakabayashi, Y., and Yamaguchi, H.
- Subjects
Nuclear Experiment - Abstract
Over the past three years, we have worked on developing a well-characterized 30S radioactive beam to be used in a future experiment aiming to directly measure the 30S(alpha,p) stellar reaction rate within the Gamow window of Type I X-ray bursts., Comment: 3 pages, 1 figure, Origin of Matter and Evolution of the Galaxies (OMEG10), March 2010, Osaka, Japan
- Published
- 2010
- Full Text
- View/download PDF
50. 30S Beam Development and X-ray Bursts
- Author
-
Kahl, D., Chen, A. A., Kubono, S., Binh, D. N., Chen, J., Hashimoto, T., Hayakawa, S., Kaji, D., Kim, A., Kurihara, Y., Lee, N. H., Nishimura, S., Ohshiro, Y., nia, K. Setoodeh, Wakabayashi, Y., and Yamaguchi, H.
- Subjects
Nuclear Experiment - Abstract
Over the past three years, we have worked on developing a well-characterized 30S radioactive beam to be used in a future experiment aiming to directly measure the 30S(alpha,p) stellar reaction rate within the Gamow window of Type I X-ray bursts. The importance of the 30S(alpha,p) reaction to X-ray bursts is discussed. Given the astrophysical motivation, the successful results of and challenges involved in the production of a low-energy 30S beam are detailed. Finally, an overview of our future plans regarding this on-going project are presented., Comment: 7 pages, 2 figures, 5th European Summer School on Experimental Nuclear Astrophysics, Santa Tecla, Sicily, September 2009
- Published
- 2010
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.