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1. Probing ???? Potential

Author

K. Shoji, Hirotaka Takahashi, Y. Fukao, Hiroyuki Okada, Hirohiko Sato, Se-Yeon Kim, B. H. Choi, Norio Saito, K. Aoki, T. Hibi, B. D. Park, Tadamitsu Kishimoto, J. S. Song, M. Kurosawa, M. Hayata, K. Imai, T. Hayakawa, J. Asai, S. J. Kim, C. S. Yoon, Tomoko Yoshida, Masaharu Ieiri, Yuji Shimizu, Akira Sato, H. Funahashi, Kiyoshi Tanida, Kaoru Taketani, Akira Ohnishi, K. Miwa, H. Akikawa, I. G. Park, Kazuhiko Yamamoto, C. J. Yoon, J. K. Ahn, and Kazuma Nakazawa

Subjects
Physics, Scattering, Mass spectrum, Scattering parameters, Range (statistics), General Physics and Astronomy, Scattering length, Invariant mass, Function (mathematics), Wave function, Computational physics
Abstract

We determined scattering length and effective range of ¥E¥E scattering for the ¥E¥E relative energy (M¥E¥E-2M¥E) from ¥E¥E threshold to 30 MeV/c2. Phase shift of the ¥E¥E wave function which described by scattering length and effective range was determined by fitting the ¥E¥E mass spectrum. The obtained scattering length -0.10+0.37-1.56 i¾ 0.04, and effective range 13.90 +14.35-9.13 i¾ 10.53 fm is the most consistent with the values predicted by using a series of the Nijmegen soft core models NSC97's. However the predicted values by using the Nijmegen hard core model ND (G-matrix), the extended soft core model ESC00, and the Kyoto-Niigata FSS are out of three standard deviations from the determined scattering parameters. Further, we determine ¥E¥E potential by fitting the ¥E¥E invariant mass spectrum using numerically solved ¥E¥E wave function with two-Gaussian shaped potential well. The ¥E¥E scattering parameters derived from the wave function are found to be scattering length -0.09, and effective range 29.34 fm with a maximum phase shift of 2.4 deg.

Published
2011
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2. EXTRACTION OF ΛΛ SCATTERING LENGTH

Author

M. Hayata, C. J. Yoon, K. Tanida, Akira Ohnishi, K. Shoji, Kaoru Taketani, T. Hibi, T. Hayakawa, Tomoko Yoshida, Koji Yamamoto, J. S. Song, Kazuma Nakazawa, Hiroyuki Okada, S. J. Kim, K. Aoki, B. D. Park, Tadamitsu Kishimoto, B. H. Choi, H. Akikawa, Hirotaka Takahashi, M. Kurosawa, Hirohiko Sato, Yuji Shimizu, K. Miwa, J. Asai, Norio Saito, C. S. Yoon, Jung Keun Ahn, S. H. Kim, Masaharu Ieiri, I. G. Park, K. Imai, Yoichiro Fukao, Akira Sato, and H. Funahashi

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Range (particle radiation), Soft core, Extraction (chemistry), Scattering parameters, General Physics and Astronomy, Proton Synchrotron, Invariant mass, Scattering length, Lambda, Standard deviation
Abstract

We determine ΛΛ scattering parameters from a ΛΛ invariant mass spectrum that was obtained by 12 C (K-, K+ΛΛ) reaction at the KEK Proton Synchrotron. In the framework of Watson's procedure, the obtained scattering length [Formula: see text] and effective range [Formula: see text] are most consistent with the values predicted by using the Nijmegen soft core models (NSC97's). However, the predicted values by using the Nijmegen hard-core ND ( G -matrix) and the extended soft-core (ESC00) models are out of two standard deviations from the determined scattering parameters.

Published
2010
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3. Observation of the 7 MeV excited spin-flip and non-spin-flip partners in 16 ΛO by γ -ray spectroscopy

Author

Osamu Hashimoto, David E. Alburger, S. H. Zhou, Y. Miura, H. Hotchi, Y. Okayasu, R. J. Sutter, L. Yuan, Adam Rusek, P. Pile, H. Akikawa, K. Tanida, Hiroyuki Tamura, J. Franz, S. Ajimura, Tomofumi Nagae, Morgan May, L. G. Tang, D. J. Millener, T. Hayakawa, Tadamitsu Kishimoto, Mifuyu Ukai, R. E. Chrien, G. B. Franklin, B. P. Quinn, Hirotaka Takahashi, K. Mizunuma, Satoshi Nakamura, Toshinobu Miyoshi, Shigeo Minami, Yoichi Sato, K. Imai, A. Banu, and Kazuma Nakazawa

Subjects
Physics, Nuclear and High Energy Physics, Spin states, Excited state, Hadron, Gamma spectroscopy, Spin-flip, Atomic physics, Spectroscopy, Excitation, Doublet state
Abstract

We have observed three λ-ray transitions in Λ 16 O from both 7MeV excited spin-flip and non-spin-flip partners (2−, 1 2 − ) to the ground-state doublet (1 1 − , 0−) via the 16O(K −, π−) reaction. The 7MeV excitation energies of the spin-doublet members (2−, 1 2 − ) were determined to be 6784 ± 4 ± 4 keV and 6562 ± 1 ± 2 keV, respectively, and thus the spacing was obtained to be 222 ± 4 ± 5 keV. This is the first observation of the spin-flip state directly populated by the (K −, π−) reaction. Moreover, such directly populated spin-flip and non-spin-flip partners were resolved for the first time.

Published
2007
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4. First observation of the ΣN decay of the S = - 2 system

Author

Kenichi Imai, S. Torikai, N. Yasuda, M. Yosoi, Hiroyuki Noumi, H. Hayata, S. Ogawa, D.H. Davis, T. Kouketsu, J. Y. Kim, I. G. Park, H. Tanaka, Y. L. Lee, K. Tanida, Y. S. Iwata, Takayoshi Kawai, C. Nagoshi, Michiko Sekimoto, K. M. Baik, Y. Kakita, K. S. Sim, H. Okabe, M. Kaneko, Koji Yamamoto, Adam Rusek, C. O. Kim, Kazuma Nakazawa, B. Bassalleck, J. H. Chung, Shigeki Aoki, Y. S. Ra, Saewoong Bahk, Masaharu Ieiri, M. Mitsuhara, J. S. Song, Tomokazu Fukuda, H. Akikawa, L. H. Zhu, J. K. Ahn, M. S. Chung, D. Seki, T. Tsunemi, M. Kawasaki, J. W C McNabb, Y. Kondo, K. Hoshino, Toshiyuki Takahashi, H. Kanda, J. T. Yang, K. Oyama, Hirotaka Takahashi, J. T. Rhee, P.K. Saha, Junji Tojo, Y. Nagase, S. J. Kim, H. M. Park, N. Ushida, H. Torii, K. Arai, Y. H. Iwata, H. Shibuya, A. K. Ichikawa, J. Parker, C. S. Yoon, Tomoko Yoshida, Fujio Takeutchi, Seok Kim, T. Watanabe, C.J. Yoon, and D.N. Tovee

Subjects
Rest (physics), Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Event (relativity), Hadron, Hyperon, Nuclear fusion
Abstract

An event emitting a Σ- -hyperon from a Ξ- -hyperon nuclear capture at rest has been observed in a hybrid-emulsion experiment. The event has been analyzed as the first observation of the weak decay of the S = - 2 system.

Published
2007
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5. Σ+p elastic scattering cross sections in the region of 350⩽PΣ+⩽750 MeV/c with a scintillating fiber active target

Author

K. S. Sim, J. M. Lee, Masaharu Ieiri, A. M. Gorin, T. Hayakawa, K. Imai, H. Funahashi, H. Kanda, Yongsun Kim, M. Hanabata, Kazunuki Yamamoto, M. S. Chung, K. Nakai, T. Tabaru, S. V. Golovkin, Akira Masaike, Y. Goto, K. Ozawa, Tsuneo Fukuda, A. Sato, Masaya Ishino, J. Arvieux, Fujio Takeutchi, A. K. Ichikawa, Hirohiko Sato, H. En'yo, P. Tlustý, H. Akikawa, H. Torii, J. K. Ahn, S. Yokkaichi, E.N. Kozarenko, Kazuma Nakazawa, Minoru Yoshida, B. Bassalleck, I. E. Kreslo, Y. Kondo, and Satoshi Mihara

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Range (particle radiation), Hydrogen, Scintillating fiber, 010308 nuclear & particles physics, Scattering, Hyperon, chemistry.chemical_element, 7. Clean energy, 01 natural sciences, Nuclear physics, Momentum, chemistry, Beamline, 0103 physical sciences, Atomic physics, 010306 general physics
Abstract

A hyperon–nucleon scattering experiment, KEK-PS E289, was carried out at the K2 beam line in KEK. We adopted a scintillating fiber active target as a hydrogen target for hyperon production and subsequent hyperon–nucleon scattering. We collected more data than in a previous experiment, KEK-PS E251. In this paper, the differential cross sections for Σ+p elastic scattering in the incident momentum range from 350 to 750 MeV/c are presented and compared with theoretical predictions from the Nijmegen group (Nijmegen Soft Core 97) and the Kyoto–Niigata group (RGM-FSS and fss2).

Published
2005
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6. Observation of hypernuclear fine structure in 16ΛO

Author

David E. Alburger, J. Franz, K. Tanida, Osamu Hashimoto, Toshinobu Miyoshi, Shigeo Minami, S. Ajimura, Yoichi Sato, Morgan May, S.N. Nakamura, K. Mizunuma, Hitoshi Tamura, H. Akikawa, Hirotaka Takahashi, R. J. Sutter, P. Pile, Mifuyu Ukai, Tomofumi Nagae, K. Imai, Y. Miura, G. B. Franklin, L. Yuan, Adam Rusek, Kazuma Nakazawa, T. Hayakawa, Y. Okayasu, B. P. Quinn, A. Banu, R. E. Chrien, Hideaki Hotchi, L. G. Tang, and T. Kishimoto

Subjects
Physics, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Excited state, Yield ratio, Tensor, Atomic physics, Ground state, Spin (physics), Semiconductor detector
Abstract

We observed two γ-ray transitions of 16ΛO in the 16O( K − , π − γ ) reaction using a germanium detector array, Hyperball. The γ rays are assigned as the M1 transitions from the 6 MeV excited state ( 1 − ) to the ground state doublet ( 1 − , 0 − ). The energies of the γ rays are 6534.1 ± 1.5 keV and 6560.2 ± 1.3 keV , and the energy spacing is 26.1 ± 2.0 keV , which corresponds to the ground state doublet spacing. From their yield ratio of 0.65 ± 0.11 ( N ( 6534 ) / N ( 6560 ) ) , the spin order of the ground state doublet is determined. This result gives a small value for the ΛN tensor force strength.

Published
2005
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7. High-resolution γ-ray spectroscopy of hyperfragments produced by stopped reactions

Author

S. Ota, K. Tanida, Hirokazu Tamura, M. Togawa, Y. Fukao, Seiji Terashima, M. Niiyama, Emiko Hiyama, K. Mizunuma, K. Miwa, H. Takahashi, Mifuyu Ukai, Y. Miura, Pranab Kumar Saha, K. Imai, H. Hotchi, Toshiyuki Takahashi, H. Akikawa, and Satoshi Nakamura

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Nuclear magnetic resonance, Isotopes of lithium, Analytical chemistry, Carbon-12, Gamma spectroscopy, Isotopes of boron, Stopping power, Spectroscopy, Lambda baryon
Abstract

We performed an experiment to measure γ rays of hyperfragments produced by stopped K − reactions on light ( A ⩽ 12 ) targets (KEK-PS E509). We clearly observed an E2 transition ( 5 / 2 + → 1 / 2 + ) in 7ΛLi with 10B, 11B and 12C targets and obtained the γ-ray intensity to be ( 7.5 ± 1.6 ) × 10 −4 per stopped K − for 10B target. In addition, a candidate for a new hypernuclear γ ray was observed. These results show that this method is quite suitable for the systematic study of hypernuclei.

Published
2005
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8. γ-ray spectroscopy in Λ hypernuclei

Author

H. Tamura, S. Ajimura, H. Akikawa, D.E. Alburger, K. Aoki, A. Banu, R.E. Chrien, G.B. Franklin, J. Franz, Y. Fujii, Y. Fukao, T. Fukuda, O. Hashimoto, T. Hayakawa, E. Hiyama, H. Hotchi, K. Imai, W. Imoto, Y. Kakiguchi, M. Kameoka, T. Kishimoto, A. Krutenkova, T. Maruta, A. Matsumura, M. May, S. Minami, Y. Miura, K. Miwa, T. Miyoshi, K. Mizunuma, T. Nagae, S.N. Nakamura, K. Nakazawa, M. Niiyama, H. Nomura, H. Noumi, Y. Okayasu, S. Ota, T. Ohtaki, H. Outa, P. Pile, B.P. Quinn, A. Rusek, P.K. Saha, Y. Sato, T. Saitoh, M. Sekimoto, R. Sutter, H. Takahashi, T. Takahashi, L. Tang, K. Tanida, S. Terashima, M. Togawa, A. Toyoda, M. Ukai, H. Yamauchi, L. Yuan, and S.H. Zhou

Subjects
Physics, Nuclear and High Energy Physics, Gamma ray, Gamma spectroscopy, Tensor, Atomic physics, Lambda, Spectroscopy, Beam (structure)
Abstract

The present status of hypernuclear gamma-ray spectroscopy with Hyperball is summarized. We observed two gamma transitions of 16-Lambda-O(1- -> 1-,0-) and obtained the strength of the Lambda-N tensor force. In 10B(K-,pi- gamma) data, we did not observe the spin-flip M1 transition of 10-Lambda-B(2- -> 1-), but gamma rays from hyperfragments such as 7-Lambda-Li(7/2+ -> 5/2+) and 9-Lambda-Be(3/2+ ->1/2+) were observed. In 11B(pi+,K+ gamma) data, we observed six gamma transitions of 11_Lambda-B. We also attempted an inclusive gamma-ray measurement with stopped K- beam.

Published
2005
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9. 7ΛLi ground-state spin determined by the yield of γ-rays subsequent to weak decay

Author

J. H. Kim, S. H. Zhou, D. Abe, T. Endo, Yukinori Sato, L. H. Zhu, H. H. Xia, Y. Fujii, Y. Kakiguchi, T. Takahashi, Y. D. Kim, H. C. Bhang, T. Murakami, Toshinobu Miyoshi, Tomofumi Nagae, H. Hotchi, S. Satoh, Michiko Sekimoto, Haruhiko Outa, Tomokazu Fukuda, H. Akikawa, K. Ozawa, Hiroyuki Noumi, L. G. Tang, R. Sawafta, K. Araki, Hiroyuki Tamura, K. Imai, Osamu Hashimoto, T. Saito, J. Sasao, and K. Tanida

Subjects
Physics, Nuclear and High Energy Physics, γ spectroscopy, Branching fraction, Isotopes of lithium, Mesonic decay, ΛN interaction, Λ hypernuclei, Excited state, Yield (chemistry), Bound state, Gamma spectroscopy, Atomic physics, Ground state, Spin (physics)
Abstract

Using a large-acceptance germanium detector array (Hyperball), we measured a γ -ray spectrum in coincidence with production of 7 Λ Li bound states in the 7 Li( π + , K + ) reaction. We observed a γ -ray peak at 429 keV due to the transition from the first excited state of 7 Be produced by the weak decay of 7 Λ Li, 7 Λ Li → 7 Be ∗ (1/2 − ,429 keV )+π − . From the yield of this γ -ray, the branching ratio of the 7 Λ Li weak decay to 7 Be ∗ (429) was obtained to be (6.0 +1.3 −1.6 )×10 −2 . Compared with theoretically calculated values of the partial decay rates, the measurement indicates that the ground-state spin of 7 Λ Li is 1/2 but not 3/2.

Published
2004
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11. Observation of double-hypernuclei and Λ-Λ interaction

Author

H. Takahashi, J.K. Ahn, H. Akikawa, S. Aoki, K. Arai, S.Y. Bahk, K.M. Baik, B. Bassalleck, J.H. Chung, M.S. Chung, D.H. Davis, T. Fukuda, K. Hoshino, A. Ichikawa, M. Ieiri, K. Imai, Y.H. Iwata, Y.S. Iwata, H. Kanda, M. Kaneko, T. Kawai, M. Kawasaki, C.O. Kim, J.Y. Kim, S.H. Kim, Y. Kondo, T. Kouketsu, C. Nagoshi, K. Nakazawa, H. Noumi, S. Ogawa, H. Okabe, M. Okuda, K. Oyama, B.D. Park, H.M. Park, I.G. Park, J. Parker, Y.S. Ra, J.T. Rhee, A. Rusek, H. Shibuya, K.S. Sim, P.K. Saha, D. Seki, M. Sekimoto, J.S. Song, T. Takahashi, F. Takeutchi, H. Tanaka, K. Tanida, J. Tojo, H. Torii, S. Torikai, D.N. Tovee, N. Ushida, T. Wint, K. Yamamoto, N. Yasuda, J.T. Yang, C.J. Yoon, C.S. Yoon, M. Yosoi, T. Yoshida, and L. Zhu

Subjects
Physics, Baryon, Nuclear physics, Nuclear and High Energy Physics, Particle decay, Branching fraction, Hadron, Hyperon, Elementary particle, Fermion, Lambda baryon
Abstract

A hybrid-emulsion experiment has been carried out at KEK-PS to study S = −2 nuclei. With the analysis of about 35% of total emulsion, we have successfully found three events of sequential weak decay of a double-hypernucleus. The results of these E373 events are summarized together with those of past experiments. The first experimental study of the branching ratios of weak decay modes of double-hypernuclei has been performed.

Published
2003
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12. Structure of Λ13C hypernucleus studied by the (K−, π−γ) reaction

Author

E. Saji, R. A. Schumacher, R. E. Chrien, Tomokazu Fukuda, H. Akikawa, K. Tanida, Y.S. Miyake, J. Nakano, Tadafumi Kishimoto, J. Franz, L. Yuan, L. G. Tang, G. B. Franklin, Adam Rusek, K. Matsuoka, P. Khaustov, R. Sawafta, P. Pile, Morgan May, S. Ajimura, H. Kohri, L. Gan, Hiroyuki Tamura, Atsushi Sakaguchi, K. Morikubo, R. J. Sutter, Yuji Shimizu, H. Hayakawa, S. Minami, B. P. Quinn, P. Eugenio, Haruhiko Outa, Hiroyuki Noumi, M. Sumihama, T. Tamagawa, and K. Paschke

Subjects
Physics, Nuclear and High Energy Physics, Structure (category theory), Particle, State (functional analysis), Atomic physics, Nuclear Experiment, Nucleon, Spectroscopy, Hypernucleus, Excitation
Abstract

The BNL-AGS/E929 experiment was carried out to study energy levels of the Λ 13 C hypernucleus by a gamma-ray spectroscopy. Energy splitting of the spin-orbit doublets, 1 2 − and 3 2 − states, was estimated precisely. The excitation energy of the 1st 3 2 + state was also measured. We discuss the symmetric and the anti-symmetric spin-orbit interactions between a Λ particle and a nucleon from the measurement.

Published
2003
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13. PHENIX Muon Arms

Author

L. Kotchenda, Wei Tian, Josh Moss, M.S. Chung, D. E. Fields, J. D. Tepe, J. M. Qualls, T. A. Carey, J.R. Archuleta, Y. Goto, J. DeMoss, R.H. Hance, H. Akikawa, Y. Watanabe, Y. Nakada, V. Cianciolo, G. Roche, C. H. Kuberg, Andy W. Brown, S. Steffens, J.D. Lopez, J. G. Boissevain, M.M. Cafferty, Ajit Kumar Mohanty, T. A. Shibata, Y. J. Mao, M. J. Kweon, S. S. Kapoor, Michiko Sekimoto, M. R. Shaw, T. Horaguchi, Shih-Chang Lee, D.E. Hurst, B. V. Dinesh, M. Gonin, A. Hoover, Christopher B. Williams, P. Rosnet, W. Y. Jang, Junji Tojo, K. S. Sim, M. Stepanov, D.J. Clark, Yu. Efremenko, J. Behrendt, X.B. Martinez, G.-B. Kim, S. F. Pate, R. E. Mischke, L. L. Chavez, H. En'yo, W. W. Kinnison, O. Drapier, K. Imai, Saskia Mioduszewski, J.B. Archuleta, J. H. Kang, M. J. Leitch, G. Gogiberidze, Masayasu Ishihara, G.W. Thornton, A. Baldisseri, John Hill, K. Kurita, L. Kluberg, B.G. Wong-Swanson, A. Romana, S. Gadrat, H. Borel, T. C. Awes, S. Batsouli, F. Gastaldi, L. Villatte, E. Taniguchi, D. S. Brown, Atsushi Taketani, D. Jouan, J. LaBounty, Y. Kamyshkov, Tai Sakuma, Y. Wan, V. Papavassiliou, J. Tradeski, E.M. Stein, H. Funahashi, S.H. Robinson, X. Liu, M. Sugioka, M. Vassent, K. Pope, Y. J. Kwon, N. Kamihara, J.-S. Chai, R. Armendariz, Y. Cobigo, Felix E. Obenshain, P. L. McGaughey, H. Torii, Z. Sun, B.R. Whitus, J. L. Drachenberg, N. Bruner, S. Klinksiek, A. P.T. Palounek, L. Sanfratello, W.E. Sondheim, Z. Li, J. Johnson, A. Debraine, J. Murata, S. P. Sorensen, J. Gosset, Ryan M. Roth, H. Kobayashi, F. G. Bellaiche, C.M. Dabrowski, P.S. Willis, A. Glenn, V. Armijo, François Fleuret, M.L. Brooks, J.S. Hicks, L.Donald Isenhower, David Smith, Y. Yang, M. C. McCain, C. Velissaris, G. R. Young, B.C. Montoya, G. Rao, M. Bobrek, R. Granier de Cassagnac, S. Chollet, R. Savino, J. G. Lajoie, A.B. Barker, Minghui Liu, W.F. Sandhoff, R. K. Choudhury, A.W. Bland, Yanwen Liu, S. Zhou, P. W. Stankus, D. W. Kim, Kenneth Francis Read, S. Held, R. S. Towell, R. Hoade, S. Yoneyama, Jack Fried, T. Ichihara, F. Plasil, L.C. Watkins, L. Davis Isenhower, N. Hayashi, B. Bassalleck, E. Lockner, P. D. Barnes, E. Fujisawa, Ahmed Al-Jamel, D. Koehler, C.T. Hunter, F. Staley, Hirohiko Sato, W. Stokes, G.W. Hart, Dong Jo Kim, Jason Newby, T.F. Gee, Norio Saito, George Davey Smith, G. S. Kyle, M. Murray, Byung-Sik Hong, J. L. Nagle, D. M. Lee, M.A. Echave, and H.D. Skank

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Spectrometer, Physics::Instrumentation and Detectors, Tracking (particle physics), Particle detector, Particle identification, Azimuth, Nuclear physics, Pion, Measuring instrument, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Instrumentation
Abstract

The PHENIX Muon Arms detect muons at rapidities of | y |=(1.2–2.4) with full azimuthal acceptance. Each muon arm must track and identify muons and provide good rejection of pions and kaons (∼10 −3 ). In order to accomplish this we employ a radial field magnetic spectrometer with precision tracking (Muon Tracker) followed by a stack of absorber/low resolution tracking layers (Muon Identifier). The design, construction, testing and expected run parameters of both the muon tracker and the muon identifier are described.

Published
2003
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14. GAMMA SPECTROSCOPY OF P-SHELL HYPERNUCLEI AND ΛN SPIN-DEPENDENT INTERACTIONS-REPORT OF BNL E930

Author

P. Eugenio, S. H. Zhou, J. Franz, K. Tanida, S. Minami, G. B. Franklin, Y. Miura, T. Hayakawa, H. Hotchi, A. Banu, H. Takahashi, Tomofumi Nagae, P. Khaustov, S. Ajimura, Morgan May, Y. Okayasu, Osamu Hashimoto, P. Pile, L. G. Tang, R. Sawafta, Tadafumi Kishimoto, J. Sasao, R. J. Sutter, Xiaofeng Zhu, L. Gan, K. Imai, Hirokazu Tamura, R. E. Chrien, B. P. Quinn, Toshinobu Miyoshi, Yoichi Sato, David E. Alburger, K. Mizunuma, H. Akikawa, Satoshi Nakamura, L. Yuan, Adam Rusek, Mifuyu Ukai, H. Schmitt, L. H. Zhu, and Kazuma Nakazawa

Subjects
Physics, Nuclear and High Energy Physics, Shell (structure), General Physics and Astronomy, High resolution, Astronomy and Astrophysics, Preliminary analysis, Nuclear physics, Level structure, Gamma spectroscopy, Tensor, Atomic physics, Spectroscopy, Spin (physics)
Abstract

High resolution γ spectroscopy of hypernuclei using Hyperball has revealed detailed level structure of several p-shell Λ hypernuclei and allowed us to extract the strengths of ΛN spin-dependent interactions. In the experiment BNL E930, we observed E2(3/2+, 5/2+ → 1/2+) transitions in [Formula: see text] and confirmed a small size of the Λ-spin-dependent spin-orbit force. Recently we took data for [Formula: see text] and [Formula: see text] in order to investigate the strength of the ΛN tensor force. In a preliminary analysis, we observed γ rays of [Formula: see text] and [Formula: see text].

Published
2003
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15. Scintillating-fiber-block detector for studying double-strangeness nuclei

Author

A. K. Ichikawa, Shigeki Aoki, Junji Tojo, Koji Yamamoto, J.T. Rhee, Kazuma Nakazawa, H. Akikawa, T. Yoshida, Masaharu Ieiri, H. Takahashi, Y. Kondo, K. Imai, and H. Kanda

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Proton, Nuclear Theory, Detector, Resolution (electron density), Hyperon, Image intensifier, Strangeness, law.invention, Nuclear physics, Pion, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Instrumentation
Abstract

Scintillating-fiber-block detectors have been constructed using 0.5 mm square fibers for the KEK-PS E373 experiment, which searches for double-strangeness nuclei. The main aim of the detector is to measure the energies of protons and pions produced from decay of double- or single-hypernuclei using their ranges. It is also used to detect Λ hyperons or the H -dibaryon, and to make event selection. The performance of the detectors was studied with low-energy proton and pion beams as well as minimum-ionizing particles. The energy resolution determined by the range measurements was 0.86 MeV for 37 MeV π − 's and 1.4 MeV for 47 MeV protons. The excellent capability of π/p separation has been also demonstrated.

Published
2002
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16. Active target with plastic scintillating fibers for hyperon-proton scattering experiments

Author

T. Tabaru, B. Bassalleck, K. Nakai, Hirohiko Sato, Tsuneo Fukuda, J. K. Ahn, Satoshi Mihara, H. En'yo, J. Arvieux, S. V. Golovkin, P. Tlusty, A. M. Gorin, Kazuma Nakazawa, H. Akikawa, S. Yokkaichi, Akira Masaike, A. Sato, Fujio Takeutchi, M. S. Chung, K. S. Sim, Masaharu Ieiri, H. Funahashi, Y. Kondo, I. E. Kreslo, Kyoichiro Ozawa, Kazuhiro Yamamoto, Jong Man Lee, Yongsun Kim, K. Imai, A. Ichikawa, T. Hayakawa, E.N. Kozarenko, Masaya Ishino, Hiroki Kanda, H. Torii, M. Hanabata, Y. Goto, and Minoru Yoshida

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Physics::Instrumentation and Detectors, Scattering, Nuclear Theory, Detector, Hyperon, Charged particle, Sigma baryon, Nuclear physics, Nuclear Energy and Engineering, High Energy Physics::Experiment, Electrical and Electronic Engineering, Exponential decay, Atomic physics, Nuclear Experiment, Spectroscopy
Abstract

An active target with plastic scintillating fibers has been constructed. This active target serves as a production target of hyperons, as well as a scattering target, and works as a 4/spl pi/-detector for charged particles. This system is designed for measurements of hyperon-proton scattering for hyperon momenta of several hundred MeV/c. A spectrometer system for the incident beam and outgoing particles of the hyperon production reaction is linked with this target-detector in order to provide triggers for the imaging device of this detector system. As a control of this detector, the decay constant of the /spl Sigma//sup -/ hyperon has been evaluated.

Published
2002
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17. Study of double-strangeness nuclei with hybrid-emulsion method (KEK-PS E373)

Author

K. Oyama, T. Kouketsu, B. Bassalleck, J. Parker, I. G. Park, C. O. Kim, H. Takahashi, Tomoko Yoshida, J. S. Song, N. Ushida, S. Ogawa, K. Hoshino, H. Akikawa, Toshiyuki Takahashi, K. Arai, H. Kanda, J.T. Yang, L. H. Zhu, J. K. Ahn, Michiko Sekimoto, Shigeki Aoki, Y. S. Iwata, Junji Tojo, Y. Nagase, S. J. Kim, Y. H. Iwata, J. Y. Kim, J. H. Chung, H. M. Park, H. Torii, Y. L. Lee, H. Okabe, J. W C McNabb, Atsushi Ichikawa, N. Yasuda, M. Mitsuhara, A. Rusek, Kwang Souk Sim, Y. S. Ra, T. Kawai, K. Imai, H. Tanaka, Saewoong Bahk, K. M. Baik, Fujio Takeutchi, M. Kaneko, Kazuhiro Yamamoto, Seok Kim, P. K. Saha, C.J. Yoon, D. Seki, C. S. Yoon, H. Shibuya, Y. Kondo, K. Tanida, J. T. Rhee, Masaharu Ieiri, M. S. Chung, S. Torikai, M. Yosoi, Hiroyuki Noumi, Kazuma Nakazawa, and C. Nagoshi

Subjects
Physics, Nuclear and High Energy Physics, Optics, Scintillating fiber, Spectrometer, business.industry, Track (disk drive), Detector, Emulsion, Nuclear emulsion, Strangeness, business
Abstract

An experiment to search for double-strangeness nuclei in nuclear emulsion is now being carried on as KEK-PS E373. Preliminary results of the data analysis for the K + spectrometer and the scintillating fiber detectors are presented. Status of the automatic track finding method for the emulsion is reported.

Published
2001
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18. High-resolution γ-ray spectroscopy of 7ΛLi

Author

T. Saito, Y. Kakiguchi, J. Sasao, Y. D. Kim, S. H. Zhou, Tomofumi Nagae, H. Hotchi, L. H. Zhu, H. H. Xia, S. Satoh, T. Takahashi, T. Murakami, H. C. Bhang, K. Imai, Toshinobu Miyoshi, H. Akikawa, Osamu Hashimoto, Haruhiko Outa, K. Tanida, Yoichi Sato, Hiroyuki Noumi, Kyoichiro Ozawa, J. H. Kim, Y. Fujii, L. G. Tang, R. Sawafta, D. Abe, T. Endo, M. Sekimoto, K. Araki, Hitoshi Tamura, and Tsuneo Fukuda

Subjects
Physics, Nuclear and High Energy Physics, Analytical chemistry, High resolution, Instrumental chemistry, Spectroscopy
Published
2001
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19. γ-ray spectroscopy of 9ΛBe

Author

Xiaofeng Zhu, L. Gang, P. Khaustov, S. Ajimura, H. Schmitt, H. Akikawa, P. Eugenio, Morgan May, Hitoshi Tamura, L. Yuan, Adam Rusek, R. E. Chrien, K. Imai, L. G. Tang, R. Sawafta, J. Franz, L. H. Zhu, J. Sasao, B. P. Quinn, P. Pile, K. Tanida, and G. B. Franklin

Subjects
Physics, Nuclear and High Energy Physics, Thesaurus (information retrieval), Information retrieval, Instrumental chemistry, Spectroscopy
Published
2001
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20. Measurement of theB(E2)ofΛ7Liand Shrinkage of the Hypernuclear Size

Author

L. G. Tang, S. H. Zhou, R. Sawafta, H. Akikawa, K. Araki, J. H. Kim, S. Satoh, K. Imai, Hitoshi Tamura, Osamu Hashimoto, D. Abe, Kyoichiro Ozawa, Y. Fujii, Y. Kakiguchi, M. Sekimoto, Tsuneo Fukuda, T. Endo, Toshinobu Miyoshi, Tomofumi Nagae, Y. D. Kim, H. Hotchi, T. Saito, Yoichi Sato, J. Sasao, T. Murakami, K. Tanida, L. H. Zhu, H. H. Xia, H. C. Bhang, T. Takahashi, Haruhiko Outa, and Hiroyuki Noumi

Subjects
Physics, Particle physics, General Physics and Astronomy, Free space, Atomic physics
Abstract

We report on the first measurement of a hypernuclear $\ensuremath{\gamma}$-transition probability. $\ensuremath{\gamma}$ rays emitted in the $E2(5/{2}^{+}\ensuremath{\rightarrow}1/{2}^{+})$ transition of ${}_{\ensuremath{\Lambda}}^{7}\mathrm{Li}$ were detected by a large-acceptance germanium detector array (Hyperball), and the lifetime of the parent state ( $5/{2}^{+}$) was determined by the Doppler shift attenuation method. The obtained result, ${5.8}_{\ensuremath{-}0.7}^{+0.9}\ifmmode\pm\else\textpm\fi{}0.7\mathrm{ps}$, was then converted into the reduced transition probability [ $B(E2)$] to be $B({E2;5/2}^{+}\ensuremath{\rightarrow}{1/2}^{+})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3.6\ifmmode\pm\else\textpm\fi{}{0.5}_{\ensuremath{-}0.4}^{+0.5}{e}^{2}{\mathrm{fm}}^{4}$. Compared with the $B(E2)$ of the corresponding $E2({3}^{+}\ensuremath{\rightarrow}{1}^{+})$ transition in the ${}^{6}\mathrm{Li}$ nucleus, our result gives evidence that the size of the ${}^{6}\mathrm{Li}$ core in ${}_{\ensuremath{\Lambda}}^{7}\mathrm{Li}$ is smaller than the ${}^{6}\mathrm{Li}$ nucleus in the free space.

Published
2001
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21. Production of twin Λ-hypernuclei from Ξ− hyperon capture at rest

Author

M. Ieiri, Y. S. Ra, Hirotaka Takahashi, C.J. Yoon, K. Tanida, Y. S. Iwata, J. Parker, Y. L. Lee, M. Sekimoto, H. M. Park, C. S. Yoon, Sanghoon Kim, A. Rusek, B. Bassalleck, S. Torikai, Saewoong Bahk, H. Shibuya, M. Yosoi, K. Nakazawa, P. K. Saha, A. K. Ichikawa, K. Hoshino, N. Yasuda, L. H. Zhu, N. Ushida, H. Akikawa, J.H. Chung, Junji Tojo, J.W.C. McNabb, J. K. Ahn, Y. Kondo, K. M. Baik, J. T. Yang, J. S. Song, Tomohiro Takahashi, M. Kaneko, M.S. Chung, C. Nagoshi, Y. H. Iwata, S. Ogawa, H. Noumi, J.Y. Kim, H. Kanda, C. O. Kim, T. Kawai, Shigeki Aoki, M. Mitsuhara, D. Seki, T. Yoshida, F. Takeutchi, S.J. Kim, K. Oyama, Koji Yamamoto, Y. Nagase, H. Torii, J.T. Rhee, K. Arai, Kwang Souk Sim, T. Kouketsu, I. G. Park, H. Tanaka, H. Okabe, and K. Imai

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Atomic system, Hyperon, Neutron, Nuclear emulsion, Hypernucleus
Abstract

A hybrid emulsion experiment was carried out to study double-strangeness nuclei produced via Ξ− hyperon capture at rest with the expectation of ten times larger statistics than previous experiments. We have analyzed 5% of the total emulsion and found one “twin-hypernuclei” event involving the emission of two single-Λ hypernuclei and a nuclear fragment from a Ξ− hyperon stopping point. The event is interpreted as the decay of a Ξ − + 14 N atomic system to 5 Λ He + 5 Λ He + 4 He + neutron . The species of the Ξ−-atom and the fragmentation products are uniquely identified for the first time for twin-hypernuclei events. Combined with the results from a past hybrid-emulsion experiment, one double-Λ hypernucleus and three twin-hypernuclei events have been found from Ξ− captures on light emulsion nuclei. The ratio of the detected rate of double-Λ hypernuclei to that of twin-hypernuclei is compared with theoretical estimates.

Published
2001
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22. Observation of a Spin-FlipM1 Transition inLΛ7i

Author

T. Murakami, K. Tanida, L. G. Tang, R. Sawafta, H. C. Bhang, Y. D. Kim, M. Sekimoto, S. H. Zhou, T. Endo, K. Araki, J. H. Kim, Osamu Hashimoto, T. Takahashi, Y. Kakiguchi, S. Satoh, L. H. Zhu, Haruhiko Outa, H. H. Xia, Hiroyuki Tamura, Tsuneo Fukuda, D. Abe, K. Imai, Kyoichiro Ozawa, Hiroyuki Noumi, T. Saito, J. Sasao, Tomofumi Nagae, H. Hotchi, Y. Fujii, H. Akikawa, Toshinobu Miyoshi, and Yoichi Sato

Subjects
Physics, Detector, General Physics and Astronomy, chemistry.chemical_element, Germanium, Lambda, Semiconductor detector, Nuclear physics, chemistry, High Energy Physics::Experiment, Spin-flip, Nuclear Experiment, Nucleon, Spin (physics)
Abstract

Using a large-acceptance germanium detector array (Hyperball), we have observed a spin-flip M1 gamma transition between the ground-state spin doublet of (7)(Lambda)Li (3/2(+)-->1/2(+)). The observed energy of 691.7+/-0.6(stat)+/-1.0(syst) keV provides crucial information on the strength of the spin-spin interaction between a Lambda and a nucleon. This is the first observation of well-identified hypernuclear gamma transitions using germanium detectors.

Published
2000
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23. Study of double-strangeness nuclei with hybrid-emulsion method (KEK-PS E373)

Author

A. Ichikawa, J.K. Ahn, Y. Akaishi, H. Akikawa, S. Aoki, S.Y. Bahk, K.M. Baik, M.S. Chung, T. Fukuda, K. Hoshino, M. Ieiri, K. Imai, Y. Iwata, H. Kanda, M. Kaneko, T. Kawai, C.O. Kim, J.Y. Kim, S.J. Kim, Y. Kondo, T. Motoba, C. Nagoshi, K. Nakazawa, H. Noumi, S. Ogawa, H. Okabe, K. Oyama, H.M. Park, I.G. Park, Y.S. Ra, J.T. Rhee, M. Sekimoto, H. Shibuya, K.S. Sim, J.S. Song, H. Takahashi, T. Takahashi, F. Takeutchi, H. Tanaka, J. Tojo, H. Torii, S. Torikai, N. Ushida, K. Yamamoto, Y. Yamamoto, J.T. Yang, N. Yasuda, C.J. Yoon, T. Yoshida, and Y. Yosoi

Subjects
Nuclear and High Energy Physics
Published
2000
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24. Double-Λhypernuclei observed in a hybrid emulsion experiment

Author

A. K. Ichikawa, M. Sekimoto, M. Kawasaki, K. Hoshino, Seok Kim, Toshiyuki Takahashi, H. Kanda, Koji Yamamoto, B. Bassalleck, I. G. Park, N. Ushida, K. S. Sim, P. K. Saha, Kenichi Imai, C. S. Yoon, M. S. Chung, H. Okabe, H. N. Kyaw, D. Seki, T. Kouketsu, T. Wint, Hirotaka Takahashi, D.N. Tovee, Y. S. Ra, Junji Tojo, Y. Nagase, Fujio Takeutchi, J. Y. Kim, J. W C McNabb, A. Sawa, S. J. Kim, Saewoong Bahk, H. Shibuya, Tomokazu Fukuda, C. J. Yoon, H. M. Park, H. Akikawa, K. Oyama, Takayoshi Kawai, C. Nagoshi, N. Yasuda, Adam Rusek, Y. Kondo, M. Kaneko, J. K. Ahn, S. Ogawa, Y. Nakanishi, J. S. Song, Masaharu Ieiri, J. T. Yang, K. Miwa, K. Itonaga, D. H. Davis, L. H. Zhu, J. T. Rhee, H. Tanaka, Shigeki Aoki, K. Tanida, T. Tsunemi, Kazuma Nakazawa, K. T. Tint, C. O. Kim, Y. S. Iwata, B. D. Park, K. M. Baik, J. H. Chung, J. Parker, M. Mitsuhara, Tomoko Yoshida, Y. L. Lee, S. Torikai, M. Yosoi, Hiroyuki Noumi, H. Torii, K. Arai, Y. H. Iwata, A. A. Min, and M. Ukai

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Binding energy, Hyperon, Particle Data Group, Lambda
Abstract

A hybrid experiment with nuclear emulsion and scintillating-fiber detectors (KEK-E373) has been performed to search for double-strangeness systems. Among about 10${}^{3}$ events of ${\ensuremath{\Xi}}^{\ensuremath{-}}$ hyperons captured at rest by emulsion nuclei, we have observed four events which clearly show the topology of cascade weak decays of double-$\ensuremath{\Lambda}$ hypernuclei including the ``Nagara'' event. Regarding the Nagara event, values of the two-$\ensuremath{\Lambda}$ binding energy (${B}_{\ensuremath{\Lambda}\ensuremath{\Lambda}}$) and the $\ensuremath{\Lambda}$-$\ensuremath{\Lambda}$ interaction energy ($\ensuremath{\Delta}{B}_{\ensuremath{\Lambda}\ensuremath{\Lambda}}$) of ${}_{\ensuremath{\Lambda}}^{}{}_{\ensuremath{\Lambda}}^{6}\mathrm{He}$ have been revised to 6.91 $\ifmmode\pm\else\textpm\fi{}$ 0.16 and 0.67 $\ifmmode\pm\else\textpm\fi{}$ 0.17 MeV, respectively, due to the recent change of the ${\ensuremath{\Xi}}^{\ensuremath{-}}$ mass value (Particle Data Group). For another three events, we have determined possible species of double-$\ensuremath{\Lambda}$ hypernuclei together with their binding energies.

Published
2013
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25. Observation of the 7 MeV excited spin-flip and non-spin-flip partners in Λ 16 O by λ-ray spectroscopy

Author

M. Ukai, S. Ajimura, H. Akikawa, D. E. Alburger, A. Banu, R. E. Chrien, G. B. Franklin, J. Franz, O. Hashimoto, T. Hayakawa, H. Hotchi, K. Imai, T. Kishimoto, M. May, D. J. Millener, S. Minami, Y. Miura, T. Miyoshi, K. Mizunuma, T. Nagae, S. N. Nakamura, K. Nakazawa, Y. Okayasu, P. Pile, B. P. Quinn, A. Rusek, Y. Sato, R. Sutter, H. Takahashi, L. Tang, H. Tamura, K. Tanida, L. Yuan, and S. H. Zhou

Published
2008
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26. H-dibaryon search by KEK-E522

Author

Tadamitsu Kishimoto, Kaoru Taketani, J. S. Song, Akira Ohnishi, M. Hayata, Y. Fukao, M. Kurosawa, C. J. Yoon, Norio Saito, C. S. Yoon, K. Aoki, Hirohiko Sato, H. Akikawa, B. D. Park, J. Asai, S. H. Kim, K. Miwa, J. K. Ahn, K. Shoji, S. J. Kim, K. Imai, Hirotaka Takahashi, Masaharu Ieiri, Yuji Shimizu, Hiroyuki Okada, Tomoko Yoshida, K. Tanida, B. H. Choi, I. G. Park, Akira Sato, H. Funahashi, T. Hayakawa, Koji Yamamoto, T. Hibi, and Kazuma Nakazawa

Subjects
Physics, Active target, Nuclear physics, Range (particle radiation), Scintillating fiber, Cascade, Binding energy, Invariant mass, Hypernucleus, Resonance (particle physics)
Abstract

We searched for the H-dibaryon resonance in the ΛΛ invariant mass spectrum obtained by 12C(K −, K + ΛΛX) reactions using a scintillating fiber active target. We observed enhanced ΛΛ production near the threshold, as found in a previous KEK experiment, with improved statistics. Data were compared with the results of a cascade model calculation including ΛΛ final state interactions consistent with the recently measured binding energy of the double-Λ hypernucleus. No significant enhancements above the levels predicted by the model were observed. The upper limit for the production cross section of the H-dibaryon with a mass range between the ΛΛ and ΞN threshold is found to be 2.1 μb/sr at a 90% confidence level.

Published
2008
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27. First observation of the ΣN decay of the S = −2 system

Author

T. Watanabe, J. K. Ahn, H. Akikawa, S. Aoki, K. Arai, S. Y. Bahk, K. M. Baik, B. Bassalleck, J. H. Chung, M. S. Chung, D. H. Davis, T. Fukuda, H. Hayata, K. Hoshino, A. Ichikawa, M. Ieiri, K. Imai, Y. H. Iwata, Y. S. Iwata, Y. Kakita, H. Kanda, M. Kaneko, T. Kawai, M. Kawasaki, C. O. Kim, J. Y. Kim, S. J. Kim, S. H. Kim, Y. Kondo, T. Kouketsu, Y. L. Lee, J. W. C. McNabb, M. Mitsuhara, Y. Nagase, C. Nagoshi, K. Nakazawa, H. Noumi, S. Ogawa, H. Okabe, K. Oyama, H. M. Park, I. G. Park, J. Parker, Y. S. Ra, J. T. Rhee, A. Rusek, H. Shibuya, K. S. Sim, P. K. Saha, D. Seki, M. Sekimoto, J. S. Song, H. Takahashi, T. Takahashi, F. Takeutchi, H. Tanaka, K. Tanida, J. Tojo, H. Torii, S. Torikai, T. Tsunemi, D. N. Tovee, N. Ushida, K. Yamamoto, N. Yasuda, J. T. Yang, C. J. Yoon, C. S. Yoon, M. Yosoi, T. Yoshida, and L. Zhu

Published
2008
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28. γ-ray spectroscopy ofΛ16O andΛ15N hypernuclei via theO16(K−,π−γ) reaction

Author

L. G. Tang, T. Hayakawa, Y. Okayasu, Osamu Hashimoto, David E. Alburger, H. Akikawa, A. Banu, R. E. Chrien, S. N. Nakamura, H. Hotchi, J. Franz, K. Mizunuma, S. Ajimura, K. Tanida, Tomofumi Nagae, Toshinobu Miyoshi, Shigeo Minami, Yoichi Sato, K. Imai, Hirotaka Takahashi, Y. Miura, Kazuma Nakazawa, Morgan May, S. H. Zhou, B. P. Quinn, D. J. Millener, Adam Rusek, R. J. Sutter, Hiroshi Tamura, Mifuyu Ukai, Tadamitsu Kishimoto, P. Pile, and G. B. Franklin

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Crystallography, Bound state, Gamma ray, Gamma spectroscopy, Proton emission, Atomic physics, Lambda, Spectroscopy, Oxygen-16
Abstract

The bound-state level structures of the {sub {lambda}}{sup 16}O and {sub {lambda}}{sup 15}N hypernuclei were studied by {gamma}-ray spectroscopy using a germanium detector array (Hyperball) via the {sup 16}O (K{sup -},{pi}{sup -}{gamma}) reaction. A level scheme for {sub {lambda}}{sup 16}O was determined from the observation of three {gamma}-ray transitions from the doublet of states (2{sup -},1{sup -}) at {approx}6.7 MeV to the ground-state doublet (1{sup -},0{sup -}). The {sub {lambda}}{sup 15}N hypernuclei were produced via proton emission from unbound states in {sub {lambda}}{sup 16}O. Three {gamma} rays were observed, and the lifetime of the 1/2{sup +};1 state in {sub {lambda}}{sup 15}N was measured by the Doppler shift attenuation method. By comparing the experimental results with shell-model calculations, the spin dependence of the {lambda}N interaction is discussed. In particular, the measured {sub {lambda}}{sup 16}O ground-state doublet spacing of 26.4{+-}1.6{+-}0.5 keV determines a small but nonzero strength of the {lambda}N tensor interaction.

Published
2008
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29. Beam position monitor and its calibration in J-PARC LINAC

Author

A. Ueno, Masanori Ikegami, T. Tomisawa, S. Lee, Susumu Sato, G. Shen, H. Sako, Z. Igarashi, H. Akikawa, and N. Kamikubota

Subjects
Physics, Physics::Instrumentation and Detectors, business.industry, Beam commissioning, Astrophysics::Instrumentation and Methods for Astrophysics, Beam position monitor, Linear particle accelerator, Optics, Nuclear magnetic resonance, Calibration, Physics::Accelerator Physics, J-PARC, Quadrupole magnet, business, Beam (structure)
Abstract

The beam commissioning of J-PARC LINAC has been started in November 2006. Beam position monitors (BPMs) which had been calibrated on the bench setup with a scanning wire, take beam-based-calibration method in order to enable the beam to pass at the centre of a quadrupole magnet (Q-magnet). In this presentation, the installed BPMs and their calibration methods are described.

Published
2007
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30. Search for theH-dibaryon resonance inC12(K−,K+ΛΛX)

Author

Masaharu Ieiri, Yoichiro Fukao, T. Hibi, Norio Saito, C. S. Yoon, I. G. Park, J. K. Ahn, S. J. Kim, K. Imai, B. D. Park, Hirohiko Sato, T. Hayakawa, H. Akikawa, Tadamitsu Kishimoto, K. Shoji, J. S. Song, H. Takahashi, Kaoru Taketani, Hiroyuki Okada, Akira Sato, B. H. Choi, Koji Yamamoto, Tomoko Yoshida, M. Kurosawa, K. Tanida, H. Funahashi, Kazuma Nakazawa, J. Asai, K. Aoki, Akira Ohnishi, K. Miwa, Yuji Shimizu, S. H. Kim, M. Hayata, and C. J. Yoon

Subjects
Baryon, Physics, Nuclear and High Energy Physics, Hadron, Carbon-12, Mass spectrum, Resonance, Production (computer science), Atomic physics, Lambda, Energy (signal processing)
Abstract

The H-dibaryon resonance was sought by a {lambda}{lambda} invariant mass spectrum that was obtained by the {sup 12}C (K{sup -},K{sup +}{lambda}{lambda}X) reactions. We observed a bump near the {lambda}{lambda} threshold, as reported by the previous experiment (KEK E224), with better statistics. Data were compared with results of a cascade model calculation including {lambda}{lambda} final state interactions consistent with the newly measured binding energy of {sub {lambda}}{sub {lambda}}{sup 6}He. No significant enhancements above levels of the model predictions were observed. The resulting upper limit for the production cross section of the H with a mass range between the {lambda}{lambda} and {xi}N threshold is found to be 2.1 {+-} 0.6 (stat.) {+-} 0.1 (syst.) {mu}b/sr at a 90% confidence level.

Published
2007
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31. Profile measurement and transverse matching in J-PARC linac

Author

Masanori Ikegami, S. Lee, A. Ueno, Z. Igarashi, H. Akikawa, T. Tomisawa, Susumu Sato, and G. Shen

Subjects
Physics, Matching (statistics), medicine.medical_specialty, business.industry, Beam commissioning, Measure (physics), Linear particle accelerator, Transverse plane, Optics, medicine, Medical physics, J-PARC, business, Beam (structure), Voltage
Abstract

Beam commissioning of J-PARC linac has been performed since November 2006. We have developed wire scanners in order to measure beam profile and perform transverse matching. Four wire scanners are installed at each matching section. We report the result of measurement of beam profile.

Published
2007
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32. Transverse Tuning Scheme for J-PARC Linac

Author

Katsushi Hasegawa, Hiroyuki Ao, Yasuhiro Kondo, A. Ueno, Masanori Ikegami, Tomohiro Ohkawa, S. Lee, H. Akikawa, Z. Igarashi, T. Tomisawa, and Susumu Sato

Subjects
Physics, Transverse plane, Matching (statistics), business.industry, Position (vector), Magnet, Continuous monitoring, MathematicsofComputing_GENERAL, Electrical engineering, J-PARC, business, Beam (structure), Linear particle accelerator
Abstract

A transverse matching scheme has been planned for the J-PARC linac beam commissioning with use of wire scanners. The beam diagnosis layout has been determined to realize the planned matching scheme. Continuous monitoring of the matching with beam position monitors is also discussed.

Published
2006
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33. Developments of the Calibation Tools for Beam Position Monitor at J-PARC Linac

Author

A. Ueno, T. Toyama, S. Lee, S. Sato, N. Kamikubota, Z. Igarashi, T. Tomisawa, Masanori Ikegami, and H. Akikawa

Subjects
Engineering, business.industry, Electrical engineering, Electronic engineering, Calibration, J-PARC, business, Beam position monitor, Beam (structure), Linear particle accelerator
Abstract

In the J-PARC LINAC, there are mainly two requirements for calibration of beam position monitors (BPMs). One is that BPMs need to be calibrated with the accuracy of less than about a hundred micrometers to minimize beam loss for the world highest class of proton intensity. The other is that about a hundred of BPMs need to be calibrated and maintained consistently. To achieve these requirements, the calibration tools are being developed. During development, experiences on real beam in a MEBT line set for the DTL commissioning are utilized. The status of the development of calibration tools is described in this paper.

Published
2006
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34. Cascade γ decay in theΛ7Lihypernucleus

Author

T. Miyoshi, Hirotaka Takahashi, K. Mizunuma, S. H. Zhou, B. P. Quinn, S. N. Nakamura, K. Tanida, R. E. Chrien, Y. Okayasu, D. J. Millener, Osamu Hashimoto, Tadamitsu Kishimoto, K. Imai, R. J. Sutter, P. Pile, Tomofumi Nagae, Hiroshi Tamura, Morgan May, Shigeo Minami, G. B. Franklin, Yoichi Sato, L. G. Tang, H. Hotchi, S. Ajimura, L. Yuan, Adam Rusek, Y. Miura, Kazuma Nakazawa, Mifuyu Ukai, H. Akikawa, A. Banu, David E. Alburger, J. Franz, and T. Hayakawa

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Gamma spectroscopy, Atomic physics, Lambda, Hypernucleus, Energy (signal processing), Spin-½
Abstract

In a \ensuremath{\gamma}-ray spectroscopy experiment with the $({K}^{\ensuremath{-}},{\ensuremath{\pi}}^{\ensuremath{-}})$ reaction on a $^{10}\mathrm{B}$ target, we have observed the $7/{2}^{+}\ensuremath{\rightarrow}5/{2}^{+}$ spin-flip $M1$ transition in ${}_{\ensuremath{\Lambda}}^{7}\text{Li}$ via \ensuremath{\gamma}-\ensuremath{\gamma} coincidence with the $5/{2}^{+}\ensuremath{\rightarrow}1/{2}^{+}E2$ transition. This is the first successful $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidence measurement for hypernuclei. The measured $M1 \ensuremath{\gamma}$-ray energy is $470.8\ifmmode\pm\else\textpm\fi{}1.9$(stat)$\ifmmode\pm\else\textpm\fi{}0.6$(syst) keV. The spacing of the $7/{2}^{+},5/{2}^{+}$ doublet is consistently explained using the strengths of the spin-spin, \ensuremath{\Lambda}-spin-orbit, and tensor interactions obtained from previous \ensuremath{\gamma}-spectroscopy experiments.

Published
2006
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35. Measurement of Σ+p elastic scattering cross sections at KEK-PS

Author

T. Tabaru, Minoru Yoshida, H. En'yo, Hirohiko Sato, I. E. Kreslo, B. Bassalleck, Y. Goto, K. Ozawa, T. Hayakawa, Masaharu Ieiri, M. S. Chung, M. Hanabata, Kazuhiro Yamamoto, Hiroki Kanda, Tomokazu Fukuda, H. Funahashi, S. Yokkaich, Masaya Ishino, J. K. Ahn, S. V. Golovkin, H. Torii, P. Tlustý, H. Akikawa, E.N. Kozarenko, J. M. Lee, Kazuma Nakazawa, J. Arvieux, Fujio Takeutchi, K. S. Sim, K. Imai, A.M. Gorin, Y. Kondo, Satoshi Mihara, K. Nakai, A. K. Ichikawa, A. Masaike, A. Sato, and Yongsun Kim

Subjects
Physics, Elastic scattering, Scintillating fiber, Hydrogen, Scattering, Nuclear Theory, Hyperon, Proton Synchrotron, chemistry.chemical_element, Sigma baryon, Momentum, Nuclear physics, chemistry, Atomic physics, Nuclear Experiment
Abstract

An experiment to measure the Σ+p scattering cross sections was carried out at KEK 12 GeV proton synchrotron. A scintillating fiber active target system was used as a hydrogen target for the hyperon production and subsequent hyperon‐nucleon scattering. Out of 1.3 × 10 6 hyperon production events, 31 events were identified as Σ+p elastic scattering events in the momentum region of 350 ⩽ pΣ+ ⩽ 750 MeV/c. Differential cross sections in the angular region of −0.8 < cosθCM < 0.8 and integrated cross sections with respect to the incident momentum were obtained. They were compared with the theoretical calculations.

Published
2006
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36. Hypernuclear Fine Structure inOΛ16and theΛNTensor Interaction

Author

T. Hayakawa, Tomofumi Nagae, Toshinobu Miyoshi, Shigeo Minami, Y. Okayasu, S. H. Zhou, Yoichi Sato, Hitoshi Tamura, H. Hotchi, Y. Miura, Kazuma Nakazawa, Hirotaka Takahashi, K. Mizunuma, D.J. Millener, A. Banu, R. J. Sutter, Morgan May, B. P. Quinn, K. Imai, R. E. Chrien, J. Franz, Tadamitsu Kishimoto, P. Pile, G. B. Franklin, Mifuyu Ukai, L. Yuan, Adam Rusek, L. G. Tang, S. N. Nakamura, H. Akikawa, S. Ajimura, K. Tanida, David E. Alburger, and Osamu Hashimoto

Subjects
Nuclear physics, Combinatorics, Physics, Excited state, Structure (category theory), General Physics and Astronomy, Tensor, Lambda, Energy (signal processing)
Abstract

We have observed two $\ensuremath{\gamma}$-ray transitions in $_{\ensuremath{\Lambda}}^{16}\mathrm{O}$ from the 6.6 MeV excited ${1}_{2}^{\ensuremath{-}}$ state to both ground-state spin-doublet members (${1}_{1}^{\ensuremath{-}},{0}^{\ensuremath{-}}$) by the (${K}^{\ensuremath{-}},{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\gamma}$) reaction. We have obtained the ground-state doublet spacing to be $26.4\ifmmode\pm\else\textpm\fi{}1.6(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\ifmmode\pm\else\textpm\fi{}0.5(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})\text{ }\text{ }\mathrm{k}\mathrm{e}\mathrm{V}$ and the excitation energy of the ${1}_{2}^{\ensuremath{-}}$ state to be $6561.7\ifmmode\pm\else\textpm\fi{}1.1(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\ifmmode\pm\else\textpm\fi{}1.7(\mathrm{s}\mathrm{y}\mathrm{s}\mathrm{t})\text{ }\text{ }\mathrm{k}\mathrm{e}\mathrm{V}$. The ground-state doublet spacing provides a small but nonzero strength of the tensor interaction between a $\ensuremath{\Lambda}$ and a nucleon. This is the first experimental result on the $\ensuremath{\Lambda}N$ tensor interaction.

Published
2004
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37. HIGH-RESOLUTION γ-RAY SPECTROSCOPY OF HYPERFRAGMENTS PRODUCED BY STOPPED K− REACTIONS

Author

M. Togawa, K. Tanida, Toshiyuki Takahashi, Y. Miura, H. Hotchi, Y. Fukao, Hirokazu Tamura, K. Miwa, H. Akikawa, H. Takahashi, S. Ota, Pranab Kumar Saha, Satoshi Nakamura, K. Mizunuma, Emiko Hiyama, Seiji Terashima, K. Imai, Mifuyu Ukai, and M. Niiyama

Subjects
Materials science, Analytical chemistry, High resolution, Spectroscopy, Measure (mathematics), Intensity (physics)
Abstract

We performed an experiment to measure γ rays of hyperfragments produced by stopped K − reactions on light ( A ⩽ 12 ) targets (KEK-PS E509). We clearly observed an E2 transition ( 5 / 2 + → 1 / 2 + ) in 7ΛLi with 10B, 11B and 12C targets and obtained the γ-ray intensity to be ( 7.5 ± 1.6 ) × 10 −4 per stopped K − for 10B target. In addition, a candidate for a new hypernuclear γ ray was observed. These results show that this method is quite suitable for the systematic study of hypernuclei.

Published
2004
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38. RECENT PROGRESS IN γ-RAY SPECTROSCOPY OF HYPERNUCLEI

Author

M. Niiyama, S. H. Zhou, P. K. Saha, Tomokazu Fukuda, L. G. Tang, H. Akikawa, T. Ohtaki, Hirokazu Tamura, R. E. Chrien, S. Ota, David E. Alburger, Y. Fukao, Mifuyu Ukai, K. Tanida, Y. Sato, Toshiyuki Takahashi, Kazuma Nakazawa, Tomofumi Nagae, S. Minami, Hirotaka Takahashi, H. Yamauchi, Emiko Hiyama, K. Aoki, Tomofumi Maruta, K. Imai, R. J. Sutter, A. Matsumura, K. Miwa, M. Kameoka, A. Krutenkova, Haruhiko Outa, H. Hotchi, J. Franz, Morgan May, Yu Fujii, M. Sekimoto, T. Saitoh, G. B. Franklin, S. Terashima, Akihiro Toyoda, Osamu Hashimoto, Hiroyuki Noumi, P. Pile, Y. Okayasu, Y. Miura, M. Togawa, A. Banu, W. Imoto, B. P. Quinn, L. Yuan, Adam Rusek, Hiroshi Nomura, S. Ajimura, Y. Kakiguchi, Toshinobu Miyoshi, Tadafumi Kishimoto, K. Mizunuma, Satoshi Nakamura, and T. Hayakawa

Subjects
Physics, Nuclear physics, Nuclear magnetic resonance, Spectroscopy
Published
2004
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39. HIGH-RESOLUTION γ-RAY SPECTROSCOPY OF P-SHELL HYPERNUCLEI (BNL E930)

Author

R. J. Sutter, Tomofumi Nagae, M. May, Y. Miura, Hirokazu Tamura, R. E. Chrien, Adam Rusek, H. Akikawa, K. Imai, Kiyoshi Tanida, Toshinobu Miyoshi, T. Hayakawa, S. Ajimura, H. Takahashi, Yoichi Sato, Kazuma Nakazawa, S. N. Nakamura, P. Pile, Tadafumi Kishimoto, J. Franz, L. Tang, David E. Alburger, S. Minami, Y. Okayasu, A. Banu, L. Yuan, K. Mizunuma, O. Hashimoto, B. P. Quinn, Mifuyu Ukai, H. Hotchi, and G. B. Franklin

Subjects
Physics, Nuclear physics, Shell (structure), High resolution, Atomic physics, Spectroscopy
Published
2004
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40. PHENIX detector overview

Author

C. H. Kuberg, N. N. Ajitanand, J.D. Lopez, J. Chiba, L. Kotchenda, B. D. Fox, S. Bhaganatula, P. Pitukhin, Shunji Nishimura, J. Behrendt, R. A. Soltz, D.E. Hurst, F. Heistermann, G.W. Thornton, Takahiro Nakamura, G. C. Mishra, Ryo Yamamoto, Takao Sakaguchi, J.B. Archuleta, M. Grosse Perdekamp, A. L. Godoi, C. Blume, G.W. Hart, C. Klein-Boesing, A. Durum, Stephen Daniels, X. Liu, J. D. Tepe, V. Bumazhnov, A. D. Frawley, G. Riabov, A. Usachev, Wuzheng Meng, C. L. Woody, J. LaBounty, M. Issah, H. Funahashi, D. S. Brown, J. Mead, A. Lebedev, L. Hawkins, G.A. Sleege, A. Shajii, P.S. Willis, A. Khomutnikov, J.S. Hicks, D. Engo, A. Ster, R. Cunningham, S. Chollet, A. G. Hansen, S. H. Aronson, E. Taniguchi, W.D. Thomas, E. Vznuzdaev, S. F. Pate, H. Tsuruoka, R.B. Chappell, K. N. Barish, Felix E. Obenshain, V. Baublis, T. Honaguchi, I. V. Sourikova, H. Torii, V.D. Lebedev, T. Shiina, David Olle Rickard Silvermyr, S. Batsouli, E. P. Hartouni, Gerry Bunce, W. Lenz, T. L. Thomas, W. Holzmann, R. Ruggiero, H.D. Skank, Charles Maguire, Y. Sumi, M. Ono, Y. J. Kwon, W. Liccardi, Ryugo S. Hayano, B. V. Dinesh, J. Chang, Y. Riabov, J. Bowers, S. S. Adler, G. S. Kyle, K. Enosawa, S. Hahn, H.-J. Kehayias, Kenta Shigaki, V. Papavassiliou, B. Libby, Sébastien Gadrat, A. S. Nyanin, E. Stenlund, E. Bosze, Y. Miyamoto, Y. I. Makdisi, W. C. Chang, F. Messer, Yasushi Nagasaka, J. Banning, D.J. Clark, N. Miftakhov, D. E. Fields, T. Ushiroda, B. V. Jacak, G. T. Danby, M.S. Musrock, T. K. Hemmick, Sean A. Kelly, M. Sugioka, Wei Xie, A. Deshpande, Hiroaki Ohnishi, Y. Yokota, James Alexander, O. Tarasenkova, Jason Newby, J.P. Jones, Wei Tian, R. du Rietz, L. Sanfratello, T.F. Gee, Y. Wan, S. Sakai, S.H. Robinson, V. Vasiliev, J. G. Boissevain, N. Kamihara, V.I. Vishnevskii, An.A. Vorobyov, F. G. Bellaiche, M. Velkovsky, Josh Moss, V. Lebedev, M. Tamai, S. Butsyk, Vladimir Samsonov, K. Katou, C.M. Dabrowski, S. T. Belyaev, P. J. Kroon, Y. Liu, M. J. Tannenbaum, V.S. Kozlov, A. K. Purwar, T. A. Carey, J.R. Archuleta, M. Sekimoto, L. Zhang, V. S. Pantuev, G. Gogiberidze, J.P. Freidberg, E. Kistenev, Nu Xu, A. P.T. Palounek, Vladislav Manko, M. Messer, Athanasios Petridis, A. Kiyomichi, D.W. Crook, M. Murray, Senta Greene, Alexei Khanzadeev, V. V. Ikonnikov, M. Chiu, Ajit Kumar Mohanty, A. Kozlov, C. Velissaris, G. R. Young, R. Averbeck, A. A. Vinogradov, V.V. Kuriatkov, R. Raynis, K. Adcox, J. Tradeski, E.M. Stein, S. Sawada, F. Matathias, Junji Tojo, P. Steinberg, R. Armendariz, B. Azmoun, M.S. Emery, J.L. Thomas, S. S. Kapoor, Junwei Wu, Byung-Sik Hong, A. Bazilevsky, L.W. Wright, R. Seto, Zhedong Zhang, Keith W. Jones, Henrik Tydesjö, C. P. Singh, Mark Allen, Mikhail Ippolitov, M. Pollack, N. Bruner, T. A. Shibata, V.A. Onuchin, W.L. Bryan, S. Garpman, Graham H. Turner, Steven E. Skutnik, Tetsufumi Hirano, Franck Gastaldi, B. Khachaturov, O. Fackler, J.W. Walker, Alexander Milov, M. D. Marx, M. Stepanov, G. Roche, G. Jackson, V. Ivanov, A. Kandasamy, E. O'Brien, C. Pancake, D. Bucher, J. Barrette, Hyun-Chul Kim, J. M. Qualls, J. Milan, M. Rosati, G.P. Solodov, M. Bobrek, T. Matsumoto, X. He, L.Donald Isenhower, H. En'yo, W. W. Kinnison, Michael L. Simpson, P. Constantin, S. Boose, M. C. McCain, Jiangyong Jia, Y. Goto, M. J. Leitch, J. L. Nagle, M. S. Chung, P. Giannotti, R. Rao, C. Witzig, S. Klinksiek, H. Cunitz, Y. Kamyshkov, R. Hoade, R. Lacey, S. Yoneyama, O. Drapier, M. Vznuzdaev, J. H. Kang, T. C. Awes, R. Belkin, X.B. Martinez, S. Belikov, K. S. Joo, R. Machnowski, S. Migluolio, J. S. Haggerty, A. Romana, J. S. Kapustinsky, Hideki Hamagaki, L. Nikkinen, Akira Masaike, D. P. Morrison, Jun Kikuchi, Philippe Rosnet, Joakim Nystrand, N. Starinsky, H. Hara, Y. Tanaka, A. Drees, D.-W. Kim, T. K. Shea, J. Negrin, W. Von Achen, M. Suzuki-Nara, G. David, V. E. Semenov, A. Moore, R. E. Mischke, J. Johnson, C. Zhang, L. L. Chavez, C.T. Hunter, Tai Sakuma, G.T. Alley, M.L. Brooks, T. Chujo, L. Wood, V.S. Griffin, Anders Nils Erik Oskarsson, Riko Higuchi, M. Kann, T. Christ, J. Harder, A. A. Rose, J. Ferrierra, J. DeMoss, D.G. Markushin, B. K. Nandi, Christopher B. Williams, K. Minuzzo, Y. Nakada, John D. Jackson, W. Guryn, M. A. Volkov, R. Conway, R. Thern, E. J. Desmond, Viktor Riabov, R.A. Todd, V. Tarakanov, Z. Sun, F. Toldo, P. L. McGaughey, Yongsun Kim, P. W. Stankus, J. Gosset, S. Esumi, J. P. Sullivan, R. Granier de Cassagnac, N. Ericson, B. R. Schlei, W. A. Zajc, Yuri Efremenko, M. Hibino, M. Kennedy, L.G. Kudin, R. Gentry, J. M. Burward-Hoy, W. Verhoeven, M. Libkind, S. Lin, Z. Li, Dong Jo Kim, T. Shimada, R.H. Hance, A. Denisov, S. Y. Kim, O. Dietzsch, D. M. Lee, V. Cianciolo, Andy W. Brown, K. Karadjev, S.A. Kahn, M. Cutshaw, C. A. Ogilvie, Sergey Fokin, G.G. Moscone, H. Buesching, Dipanwita Dutta, V. Armijo, Iou.A. Koutcheryaev, V. Shangin, A. Hoover, I. Tserruya, V.V. Kashikhin, F. Barta, A.B. Barker, R. Amirikas, Julia Velkovska, L. Villatte, I. E. Yushmanov, V. Shelikhov, T. C. Sangster, L. Paffrath, R. Savino, V. Singh, E. Fujisawa, M.A. Echave, G. B. Kim, J. Gannon, D. Koehler, H. Hayashi, K. Ebisu, Yasuo Miake, M. Lenz, Melissa C. Smith, Xingguo Li, Hirohiko Sato, K. El Chenawi, S. K. Tuli, E. Roschin, D. J. Lim, W. Stokes, Zhongfan Liu, R. Jayakumar, J. Lauret, Aya Sakaguchi, German Martinez, M. Gonin, George Davey Smith, Y. H. Shin, Shih-Chang Lee, Martin Purschke, Y. Kuroki, W. Y. Jang, Minghui Liu, K. S. Sim, R. Begay, Alexander Vasiliev, Sebastian N. White, K. Kurita, M. Sivertz, T. Weimer, Kenneth Francis Read, D. Kotchetkov, T. Plagge, Z. Fraenkel, H.-Å. Gustafsson, A.W. Bland, J. Stewering, S. Bathe, D. Borland, Hiroyuki Sako, K. Imai, F. Kajihara, S. P. Stoll, H. Delagrange, V.A. Evseev, M. Kopytine, K. Yagi, S. Zhou, D.C. Smith, B. Komkov, B.R. Whitus, J. L. Drachenberg, Markus Merschmeyer, C. Britton, Y. Severgin, Norio Saito, S. Wang, T. E. Miller, R. Santo, R. Hutter, A. Enokizono, Kensuke Homma, P. Chung, E. Melnikov, K. Pope, T. Ferdousi, W.F. Sandhoff, R. K. Choudhury, A. Debraine, M.A. Kelley, Yoshio Arai, S.S. Frank, T. Ichihara, S. P. Sorensen, S. C. Johnson, Y. J. Mao, W. Sippach, D. Jouan, S. Chernichenko, M. J. Kweon, K. Koseki, Peter M. Nilsson, A. Franz, J. T. Mitchell, F. K. Wohn, B. Bassalleck, F. Mühlbacher, T. K. Ghosh, L. Ewell, T. Moore, J. G. Lajoie, T. Hachiya, S. A. Nikolaev, M. R. Shaw, K.C. Cook, U. Jagadish, M. Rau, Atsushi Taketani, H. W. Van Hecke, I. D. Ojha, Motoi Inaba, L. Britton, H. Kobayashi, S. Salomone, M. Vassent, S. K. Mark, S. Rankowitz, David D'Enterria, Y. Berdnikov, J. E. Frantz, R. Petersen, J. Simon-Gillo, R. P. Pisani, D. Jaffe, Y. Akiba, P. D. Barnes, Laurent Bernard Aphecetche, Herve Borel, Lennart Osterman, Nikolay Tyurin, S. Nagamiya, Kazuhiro Tanaka, A. Glenn, S. Urasawa, Klaus Johannes Reygers, R. Schleuter, B.C. Montoya, G. Rao, S. Steffens, S. Y. Fung, V. Kochetkov, J.R. Mahon, P. Kravtsov, Nathan Longbotham, Y. Cobigo, Jack Fried, M. Kurata-Nishimura, I. Sibiriak, I. Ravinovich, P. Chand, F. Plasil, L.C. Watkins, Ryan M. Roth, J. Halliwell, S. S. Ryu, D. Autrey, M. Van Lith, Y. Melnikov, Ahmed Al-Jamel, T. Kohama, Masayasu Ishihara, John Hill, K. Oyama, L. Kluberg, B.G. Wong-Swanson, Susumu Sato, A.L. Wintenberg, M. Muniruzzaman, P. O'Conner, F. Staley, S. Markacs, Toru Sugitate, V. Trofimov, S. Kametani, Y. Yang, B. M. Johnson, H. Akikawa, Y. Watanabe, R. Prigl, M.M. Cafferty, François Fleuret, M. Aizama, Brian Cole, R. S. Towell, J. H. Thomas, L. Davis Isenhower, S. Marino, J.C. Biggs, M. J. Bennett, K. Wolniewicz, N. Hayashi, A. Soldatov, D. S. Ho, J. Fellenstein, N. Heine, C. Y. Chi, W.E. Sondheim, E. Lockner, A. A. Tsvetkov, T. Peitzmann, Saskia Mioduszewski, H. Wang, Yves Roland Schutz, C. Pinkenburg, J. Murata, S. Botelho, Shiv K. Gupta, J.-S. Chai, J. M. Heuser, Sumio Kato, E. M. Takagui, I. Shein, I. Otterlund, A.R. Harvey, Alberto Baldisseri, A. Danmura, S. Yokkaichi, S. Held, Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Harrison M. Ludlam T. Ozaki S., PHENIX, Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Muon, Spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, Electron, Nuclear matter, 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, PHENIX detector, Nuclear Experiment, 010306 general physics, Nucleon, Instrumentation
Abstract

The PHENIX detector is designed to perform a broad study of A-A, p-A, and p-p collisions to investigate nuclear matter under extreme conditions. A wide variety of probes, sensitive to all timescales, are used to study systematic variations with species and energy as well as to measure the spin structure of the nucleon. Designing for the needs of the heavy-ion and polarized-proton programs has produced a detector with unparalleled capabilities. PHENIX measures electron and muon pairs, photons, and hadrons with excellent energy and momentum resolution. The detector consists of a large number of subsystems that are discussed in other papers in this volume. The overall design parameters of the detector are presented. (C) 2002 Elsevier Science B.V. All rights reserved.

Published
2003

41. Λ13Chypernucleus studied with the13C(K−,π−γ)reaction

Author

Tsuneo Fukuda, T. Mori, L. Yuan, Y.S. Miyake, J. Nakano, P. Khaustov, Morgan May, S. Ajimura, Atsushi Sakaguchi, R. J. Sutter, P. Eugenio, H. Kohri, Tadamitsu Kishimoto, P. Pile, K. Matsuoka, J. Franz, H. Hayakawa, G. B. Franklin, R. Sawafta, E. Saji, M. Sumihama, Hiroyuki Tamura, L. G. Tang, K. Morikubo, H. Akikawa, Haruhiko Outa, R. A. Schumacher, Hiroyuki Noumi, R. E. Chrien, Adam Rusek, Kiyoshi Tanida, Y. Shimizu, T. Tamagawa, B. P. Quinn, L. Gan, Shigeo Minami, and K. Paschke

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Pi, Hypernucleus, Lambda
Published
2002
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42. Hypernuclear Fine Structure inBΛ9e

Author

J. Franz, R. E. Chrien, Morgan May, L. G. Tang, P. Eugenio, P. Khaustov, K. Imai, R. Sawafta, J. Sasao, Xiaofeng Zhu, L. Yuan, Adam Rusek, S. H. Zhou, S. Ajimura, H. Akikawa, P. Pile, K. Tanida, Hiroyuki Tamura, G. B. Franklin, H. Schmitt, B. P. Quinn, L. Gang, and L. H. Zhu

Subjects
Physics, Particle physics, Structure (category theory), General Physics and Astronomy, Atomic physics, Nucleon, Lambda, Hypernucleus, Hyperfine structure, Energy (signal processing)
Abstract

With a germanium detector array (Hyperball), we observed two $\ensuremath{\gamma}$-ray peaks corresponding to the two transitions ( ${5/2}^{+}\ensuremath{\rightarrow}{1/2}^{+}$ and ${3/2}^{+}\ensuremath{\rightarrow}{1/2}^{+}$) in the ${}_{\ensuremath{\Lambda}}^{9}\mathrm{Be}$ hypernucleus which was produced by the ${}^{9}\mathrm{Be}({K}^{\ensuremath{-}},{\ensuremath{\pi}}^{\ensuremath{-}})$ reaction. The energies of the $\ensuremath{\gamma}$ rays are $3029\ifmmode\pm\else\textpm\fi{}2\ifmmode\pm\else\textpm\fi{}1\mathrm{keV}$ and $3060\ifmmode\pm\else\textpm\fi{}2\ifmmode\pm\else\textpm\fi{}1\mathrm{keV}$. The energy difference was measured to be ${31.4}_{\ensuremath{-}3.6}^{+2.5}\mathrm{keV}$, which indicates a very small $\ensuremath{\Lambda}$-spin-dependent spin-orbit force between a $\ensuremath{\Lambda}$ and a nucleon. This is the smallest level splitting by far ever measured in a hypernucleus.

Published
2002
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43. Hypernuclear fine structure in (9)(lambda)Be

Author

H, Akikawa, S, Ajimura, R E, Chrien, P M, Eugenio, G B, Franklin, J, Franz, L, Gang, K, Imai, P, Khaustov, M, May, P H, Pile, B, Quinn, A, Rusek, J, Sasao, R I, Sawafta, H, Schmitt, H, Tamura, L, Tang, K, Tanida, L, Yuan, S H, Zhou, L H, Zhu, and X F, Zhu

Abstract

With a germanium detector array (Hyperball), we observed two gamma-ray peaks corresponding to the two transitions (5/2(+)--1/2(+) and 3/2(+)--1/2(+)) in the (9)(Lambda)Be hypernucleus which was produced by the 9Be(K-,pi(-)) reaction. The energies of the gamma rays are 3029 +/- 2 +/- 1 keV and 3060 +/- 2 +/- 1 keV. The energy difference was measured to be 31.4(+2.5)(-3.6) keV, which indicates a very small Lambda-spin-dependent spin-orbit force between a Lambda and a nucleon. This is the smallest level splitting by far ever measured in a hypernucleus.

Published
2001

44. Observation of aHΛΛ6eDouble Hypernucleus

Author

S. Torikai, J. Parker, M. Yosoi, J. H. Chung, N. Ushida, Hiroyuki Noumi, D.H. Davis, M. Mitsuhara, Tomoko Yoshida, Y. S. Iwata, Y. S. Ra, Fujio Takeutchi, Kazuma Nakazawa, Y. L. Lee, H. Torii, H. Shibuya, M. Sekimoto, K. S. Sim, C. O. Kim, Junji Tojo, Y. Nagase, K. M. Baik, Adam Rusek, H. Okabe, K. Oyama, S. J. Kim, Tomokazu Fukuda, Kazunuki Yamamoto, H. Akikawa, K. Imai, K. Arai, J. S. Song, J. K. Ahn, H. Tanaka, L. H. Zhu, T. Takahashi, B. Bassalleck, C. S. Yoon, T. Kouketsu, Shigeki Aoki, M. S. Chung, D.N. Tovee, Saewoong Bahk, Takayoshi Kawai, C. Nagoshi, Seok Kim, J. Y. Kim, J. W C McNabb, H. M. Park, N. Yasuda, K. Hoshino, H. Kanda, Masaharu Ieiri, K. Tanida, I. G. Park, Y. H. Iwata, Hirotaka Takahashi, J. T. Rhee, M. Kawasaki, M. Kaneko, S. Ogawa, P. K. Saha, D. Seki, C. J. Yoon, Y. Kondo, J. T. Yang, and A. K. Ichikawa

Subjects
Physics, Particle physics, Excited state, Hyperon, General Physics and Astronomy, Lambda, Hypernucleus
Abstract

A double-hyperfragment event has been found in a hybrid-emulsion experiment. It is identified uniquely as the sequential decay of ${}_{\ensuremath{\Lambda}\ensuremath{\Lambda}}^{6}\mathrm{He}$ emitted from a ${\ensuremath{\Xi}}^{\ensuremath{-}}$ hyperon nuclear capture at rest. The mass of ${}_{\ensuremath{\Lambda}\ensuremath{\Lambda}}^{6}\mathrm{He}$ and the $\ensuremath{\Lambda}\ensuremath{-}\ensuremath{\Lambda}$ interaction energy $\ensuremath{\Delta}{B}_{\ensuremath{\Lambda}\ensuremath{\Lambda}}$ have been measured for the first time devoid of the ambiguities due to the possibilities of excited states. The value of $\ensuremath{\Delta}{B}_{\ensuremath{\Lambda}\ensuremath{\Lambda}}$ is $1.01\ifmmode\pm\else\textpm\fi{}{0.20}_{\ensuremath{-}0.11}^{+0.18}\phantom{\rule{0ex}{0ex}}\mathrm{MeV}$. This demonstrates that the $\ensuremath{\Lambda}\ensuremath{-}\ensuremath{\Lambda}$ interaction is weakly attractive.

Published
2001
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45. HYPERNUCLEAR γ SPECTROSCOPY: RECENT RESULTS WITH HYPERBALL

Author

J. H. Kim, K. Araki, Adam Rusek, P. Khaustov, H. Schmitt, S. Ajimura, Y. D. Kim, L. Gan, T. Saito, D. Abe, Toshinobu Miyoshi, S. Satoh, R. A. Schumacher, Hirokazu Tamura, R. E. Chrien, R. Sawafta, P. Eugenio, J. Franz, M. Sekimoto, Tsuneo Fukuda, Y. Kakiguchi, L. Tang, Kiyoshi Tanida, H. Akikawa, J. Nakano, Xiaofeng Zhu, S. H. Zhou, T. Tamagawa, Haruhiko Outa, Y. Fujii, T. Takahashi, T. Endo, Kyoichiro Ozawa, Hiroyuki Noumi, H. Hotchi, P. Pile, M. May, H. C. Bhang, Tomofumi Nagae, G. B. Franklin, J. Sasao, O. Hashimoto, L. H. Zhu, B. P. Quinn, H. H. Xia, L. Yuan, Y. Sato, K. Imai, T. Murakami, and H. Kohri

Subjects
Physics, Nuclear physics, Spectroscopy
Published
2001
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46. Production ofΛΛ4HHypernuclei

Author

P. Eugenio, C. A. Davis, B. P. Quinn, Tomokazu Fukuda, H. Akikawa, A. K. Ichikawa, K. Shileev, K. Kubota, Daniel S. Carman, M. Landry, Tomofumi Nagae, H. Hotchi, Haruhiko Outa, M. Sekimoto, L. Gan, Shigeo Minami, Tadamitsu Kishimoto, L. Yuan, Adam Rusek, K. Paschke, P. Pile, P. Khaustov, K. Tanida, S. Ajimura, Yuji Shimizu, H. Schmitt, V. Rasin, T. Miyachi, P. Koran, G. B. Franklin, Morgan May, H. Fischer, A. Berdoz, C. A. Meyer, H. Kohri, R. A. Schumacher, Jung Keun Ahn, L. G. Tang, R. E. Chrien, B. Bassalleck, R. J. Sutter, A. Kourepin, M. Prokhabatilov, Z. E. Meziani, T. Tamagawa, S. Kahana, J. Franz, Kazunuki Yamamoto, J. Nakano, and K. Imai

Subjects
Physics, Particle physics, Nuclear Theory, General Physics and Astronomy, Strangeness, Lambda, Hypernucleus, Synchrotron, law.invention, Nuclear physics, Pion, law, High Energy Physics::Experiment, Production (computer science), Decay chain, Nuclear Experiment, Line (formation)
Abstract

An experiment demonstrating the production of double-Lambda hypernuclei in (K(-),K(+)) reactions on (9)Be was carried out at the D6 line in the BNL alternating-gradient synchrotron. The technique was the observation of pions produced in sequential mesonic weak decay, each pion associated with one unit of strangeness change. The results indicate the production of a significant number of the double hypernucleus (4)(double Lambda)H and the twin hypernuclei (4)(Lambda)H and (3)(Lambda)H. The relevant decay chains are discussed and a simple model of the production mechanism is presented. An implication of this experiment is that the existence of an S = -2 dibaryon more than a few MeV below the double Lambda mass is unlikely.

Published
2001
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47. Observation of a (6)(LambdaLambda)He double hypernucleus

Author

H, Takahashi, J K, Ahn, H, Akikawa, S, Aoki, K, Arai, S Y, Bahk, K M, Baik, B, Bassalleck, J H, Chung, M S, Chung, D H, Davis, T, Fukuda, K, Hoshino, A, Ichikawa, M, Ieiri, K, Imai, Y H, Iwata, Y S, Iwata, H, Kanda, M, Kaneko, T, Kawai, M, Kawasaki, C O, Kim, J Y, Kim, S J, Kim, S H, Kim, Y, Kondo, T, Kouketsu, Y L, Lee, J W, McNabb, M, Mitsuhara, Y, Nagase, C, Nagoshi, K, Nakazawa, H, Noumi, S, Ogawa, H, Okabe, K, Oyama, H M, Park, I G, Park, J, Parker, Y S, Ra, J T, Rhee, A, Rusek, H, Shibuya, K S, Sim, P K, Saha, D, Seki, M, Sekimoto, J S, Song, T, Takahashi, F, Takeutchi, H, Tanaka, K, Tanida, J, Tojo, H, Torii, S, Torikai, D N, Tovee, N, Ushida, K, Yamamoto, N, Yasuda, J T, Yang, C J, Yoon, C S, Yoon, M, Yosoi, T, Yoshida, and L, Zhu

Abstract

A double-hyperfragment event has been found in a hybrid-emulsion experiment. It is identified uniquely as the sequential decay of ( 6)(LambdaLambda)He emitted from a Xi(-) hyperon nuclear capture at rest. The mass of ( 6)(LambdaLambda)He and the Lambda-Lambda interaction energy DeltaB(LambdaLambda) have been measured for the first time devoid of the ambiguities due to the possibilities of excited states. The value of DeltaB(LambdaLambda) is 1.01+/-0.20(+0.18)(-0.11) MeV. This demonstrates that the Lambda-Lambda interaction is weakly attractive.

Published
2001

48. Production of (4)(double Lambda)H hypernuclei

Author

J K, Ahn, S, Ajimura, H, Akikawa, B, Bassalleck, A, Berdoz, D, Carman, R E, Chrien, C A, Davis, P, Eugenio, H, Fischer, G B, Franklin, J, Franz, T, Fukuda, L, Gan, H, Hotchi, A, Ichikawa, K, Imai, S H, Kahana, P, Khaustov, T, Kishimoto, P, Koran, H, Kohri, A, Kourepin, K, Kubota, M, Landry, M, May, C, Meyer, Z, Meziani, S, Minami, T, Miyachi, T, Nagae, J, Nakano, H, Outa, K, Paschke, P, Pile, M, Prokhabatilov, B P, Quinn, V, Rasin, A, Rusek, H, Schmitt, R A, Schumacher, M, Sekimoto, K, Shileev, Y, Shimizu, R, Sutter, T, Tamagawa, L, Tang, K, Tanida, K, Yamamoto, and L, Yuan

Abstract

An experiment demonstrating the production of double-Lambda hypernuclei in (K(-),K(+)) reactions on (9)Be was carried out at the D6 line in the BNL alternating-gradient synchrotron. The technique was the observation of pions produced in sequential mesonic weak decay, each pion associated with one unit of strangeness change. The results indicate the production of a significant number of the double hypernucleus (4)(double Lambda)H and the twin hypernuclei (4)(Lambda)H and (3)(Lambda)H. The relevant decay chains are discussed and a simple model of the production mechanism is presented. An implication of this experiment is that the existence of an S = -2 dibaryon more than a few MeV below the double Lambda mass is unlikely.

Published
2001

49. Doubly strange nuclei by a hybrid-emulsion experiment E373 at KEK

Author

Masaharu Ieiri, M. Sekimoto, Y. S. Ra, G. B. Franklin, M. S. Chung, Y. Akaishi, Fujio Takeutchi, Kensuke Arai, P. K. Saha, T. Takahashi, C. Nagoshi, Adam Rusek, Hirotaka Takahashi, Y. S. Iwata, S. Torikai, N. Yasuda, Takayoshi Kawai, C. S. Yoon, H. Shibuya, Shigeki Aoki, Saewoong Bahk, Y. Yamamoto, Y. Kondo, D.N. Tovee, J. H. Chung, A. K. Ichikawa, J. T. Rhee, M. Yosoi, K. M. Baik, Kazuma Nakazawa, B. Bassalleck, Jinhu Yang, Hiroyuki Noumi, K. S. Sim, D. H. Davis, I. G. Park, Sanghoon Kim, Hajime Tanaka, H. Okabe, T. Yoshida, M. Kaneko, C. O. Kim, D. Seki, K. Imai, S. Ogawa, J. S. Song, C. J. Yoon, H. Torii, L. H. Zhu, Tomokazu Fukuda, H. Akikawa, J. K. Ahn, K. Tanida, M. Mitsuhara, T. Kouketsu, Y. H. Iwata, Toshio Motoba, Kazunuki Yamamoto, J. Y. Kim, Y. L. Lee, J. Parker, N. Ushida, K. Oyama, Junji Tojo, Y. Nagase, S. J. Kim, H. M. Park, J. W C McNabb, K. Hoshino, and H. Kanda

Subjects
Physics, Nuclear physics, Particle physics, Pion, Meson, Hyperon, Lambda baryon, Isotopes of beryllium, Hypernucleus, Isotopes of helium, Xi baryon
Abstract

A hybrid emulsion experiment E373 at KEK has been carried out to study doubly strange nuclear system. By the 8% data analysis of all, one twin single-Λ hypernuclei event and two events of double-Λ hypernucleus have been successfully detected. The twin single-Λ event is uniquely interpreted as Ⅺ−+14N→Λ5He+Λ5He+4He+n for the first time. In the first double-Λ hypernucleus event, “Demachi-Yanagi,” it is interpreted as Ⅺ−+12C→ΛΛ10Be* (or ΛΛ10Be*)+t. The second double-Λ hypernucleus event, “NAGARA,” shows a clearly recognized topology and the interpretation is unique as Ⅺ−+12C→ΛΛ6He+4He+t, ΛΛ6He→Λ5He+π−+p, Λ5He→p+d+2n etc. By the preliminary result of the ΛΛ6He, the attractive ΛΛ interaction has been confirmed with the ΔBΛΛ∼1 MeV.

Published
2001
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50. LAMBDA-<font>N</font> SPIN DEPENDENT INTERACTIONS STUDIED BY GAMMA-RAY SPECTROSCOPY OF HYPERNUCLEI

Author

K. Tanida, T. Murakami, K. Araki, H. Kohri, K. Imai, J. H. Kim, Adam Rusek, R. A. Schumacher, L. Yuan, R. E. Chrien, D. Abe, H. Akikawa, Kyoichiro Ozawa, Xiaofeng Zhu, J. Sasao, R. Sawafta, O. Hashimoto, Tsuneo Fukuda, Y. Sato, L. Tang, P. Khaustov, L. Gan, M. May, Hiroshi Tamura, S. Ajimura, B. P. Quinn, Haruhiko Outa, L. H. Zhu, H. H. Xia, Hiroyuki Noumi, Y. Kakiguchi, T. Tamagawa, H. Hotchi, P. Pile, G. B. Franklin, M. Sekimoto, Toshinobu Miyoshi, S. H. Zhou, T. Takahashi, H. C. Bhang, P. Eugenio, Y. Fujii, Y. D. Kim, T. Saito, Tomofumi Nagae, S. Satoh, and J. Nakano

Subjects
Physics, Nuclear physics, Gamma spectroscopy, Lambda, Spin (physics)
Published
2000
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