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Journal Articles

What makes the peak structure of the $$Lambda p$$ invariant-mass spectrum in the $$K^{-3} rm He rightarrow Lambda$$$$pn$$ reaction?

Sekihara, Takayasu; Oset, E.*; Ramos, A.*

Acta Physica Polonica B, 48(10), p.1869 - 1874, 2017/10

 Times Cited Count:1 Percentile:100(Physics, Multidisciplinary)

Journal Articles

Proton-neutron random phase approximation studied by the Lipkin-Meshkov-Glick model in the Su(2)$$times$$Su(2) Group

Minato, Futoshi

Acta Physica Polonica B; Proceedings Supplement, 10(1), p.131 - 138, 2017/00

The random phase approximation (RPA) is one of the useful approaches to describe a collective motion of nuclei. However, RPA intrinsically considers only 1 particle-1 hole (1p1h) excitations, as a result it fails to describe the width of the excited states, for example the Gamow-Teller (GT) state. To include higher-order particle-hole excitations, one can extend RPA to Second RPA (SRPA) which includes 2p2h excitations in a similar way to RPA with the quasi-boson-approximation (QBA). However, it fails to describe the GT distribution even with those model. A part of the problem may arise from the use of QBA. In past studies, SRPA was compared with exact solution using the Lipkin Model and the validity of application of QBA to them was examined. In this work, we examine proton-neutron SRPA (pnSRPA) in SU(4) basis. SU(4) is naturally required in this case to take into account two different particles having two levels each. The first and second excited states are calculated by the diagonalization of Hamiltonian and pnSRPA.

Journal Articles

Two-, three-, many-body systems involving mesons. Multimeson condensates

Oset, E.*; 10 of others*; Oka, Makoto

Acta Physica Polonica B, 47(2), p.357 - 365, 2016/02

 Times Cited Count:2 Percentile:63.85(Physics, Multidisciplinary)

We review results from studies with unconventional many-hadron systems containing mesons: systems with two mesons and one baryon, three mesons, some novel systems with two baryons and one meson, and finally, systems with many vector mesons, up to six, with their spins aligned forming states of increasing spin. We show that in many cases, one has experimental counterparts for the states found, while in some other cases, they remain as predictions, which we suggest to be searched in BESIII, Belle, LHCb, FAIR and other facilities.

Journal Articles

Measurement of the strong interaction induced shift and width of the 1s state of kaonic deuterium at J-PARC

Zmeskal, J.*; Tanida, Kiyoshi; 75 of others*

Acta Physica Polonica B, 46(1), p.101 - 112, 2015/01

 Times Cited Count:4 Percentile:50.01(Physics, Multidisciplinary)

Journal Articles

Alpha-photon coincidence spectroscopy along element 115 decay chains

Rudolph, D.*; Forsberg, U.*; Golubev, P.*; Sarmiento, L. G.*; Yakushev, A.*; Andersson, L.-L.*; Di Nitto, A.*; D$"u$llmann, Ch. E.*; Gates, J. M.*; Gregorich, K. E.*; et al.

Acta Physica Polonica B, 45(2), p.263 - 272, 2014/02

 Times Cited Count:15 Percentile:21.56(Physics, Multidisciplinary)

Produced in the reaction of $$^{48}$$Ca beam with an $$^{243}$$Am target, thirty correlated $$alpha$$-decay chains were observed. Observed decay chains are consistent with a previously reported decay chain, which confirms the identification of the element 115. In addition, an $$alpha$$-photon coincidence measurement was performed, and $$gamma$$ rays as well as X-ray candidates were observed in this decay chain. The $$gamma$$-ray observation in the heaviest region of superheavy nuclei brings a big progress in the superheavy nuclear structure studies.

Journal Articles

First experiment at TASCA towards X-ray fingerprinting of element 115 decay chains

Forsberg, U.*; Golubev, P.*; Sarmiento, L. G.*; Jeppsson, J.*; Rudolph, D.*; Andersson, L.-L.*; Ackermann, D.*; Asai, Masato; Block, M.*; Eberhardt, K.*; et al.

Acta Physica Polonica B, 43(2), p.305 - 311, 2012/02

The atomic numbers and mass numbers of superheavy elements produced in the reactions of $$^{48}$$Ca beam with actinide targets have not been identified with direct experimental evidences. This causes a little doubt about a new element synthesis. The aim of this study is to identify the atomic numbers of those superheavy elements through characteristic X-ray measurements. To produce and separate superheavy elements, we employed a gas-filled separator TASCA at GSI, and constructed high-efficiency $$alpha$$-$$gamma$$-electron multi-coincidence detector setup at the focal plane of TASCA. Transmission efficiencies and focusing abilities were tested experimentally, and compared with simulations. We achieved a good performance to realize X-ray measurement for the element 115.

Journal Articles

Shape coexistence in even-even mo isotopes studied via coulomb excitation

Zieli$'n$ska, M.*; Czosnyka, T.*; Wrzosek-Lipska, K.*; Choi$'n$ski, J.*; Hatsukawa, Yuichi; Iwanicki, J.*; Koizumi, Mitsuo; Kusakari, Hideshige*; Matsuda, Makoto; Morikawa, Tsuneyasu*; et al.

Acta Physica Polonica B, 36(4), p.1289 - 1292, 2005/04

The nuclei $$^{96}$$Mo and $$^{100}$$Mo have been Coulomb excited using various combinations of beams and targets. The investigation of the eletromagnetic structure of these isotopes provides an experimental background for a theoretical description of the shape coexistence observed in the previously studied $$^{98}$$Mo isotope.

Journal Articles

NQR measurements of UTGa$$_{5}$$

Kato, Harukazu; Sakai, Hironori; Kambe, Shinsaku; Walstedt, R. E.; Tokiwa, Yoshifumi; Onuki, Yoshichika

Acta Physica Polonica B, 34(2), p.1063 - 1066, 2003/09

We performed $$^{69,71}$$Ga-NMR/NQR studies for UPtGa$$_{5}$$, which is a 5$$f$$-itinerant antiferromagnets with Neel temperature $$T_{N}$$ = 26 K and an electronic specific coefficient $$gamma$$ = 57 mJ/mol K$$^{2}$$. From the NMR spectrum in the paramagnetic temperature region, the hyperfine coupling constants $$A_{hf}^{para}$$ in the paramagnetic state have been evaluated. The magnitude of the transferred field has been evaluated from the zero-applied-field spectrum, yielding a value for the hyperfine coupling constant $$A_{hf}^{AF}$$ in the antiferromagnetic state. The estimated value of $$A_{hf}^{AF}$$ is an order of magnitude larger than that of $$A_{hf}^{para}$$. This implies the existence of a long-ranged hyperfine interaction path. The mechanism of the hyperfine interaction will be discussed in terms of RKKY interactions.

Journal Articles

Magnetic excitations in an itinerant 5${it f}$ antiferromagnet UPt$$_{2}$$Si$$_{2}$$

Metoki, Naoto; Koike, Yoshihiro; Haga, Yoshinori; Bernhoeft, N.*; Lander, G. H.*; Tokiwa, Yoshifumi; Onuki, Yoshichika

Acta Physica Polonica B, 34(2, Part2), p.979 - 982, 2003/02

no abstracts in English

Journal Articles

Pressure effect on antiferromagnetic ordering in UPb$$_3$$

Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Nakashima, Miho*; Aoki, Dai*; Onuki, Yoshichika*; Hedo, Masato*; Uwatoko, Yoshiya*

Acta Physica Polonica B, 34(2), p.1239 - 1242, 2003/02

Uranium intermetallic compounds UX$$_3$$ (X = Si, Ge, Sn, Pb) form a ariety of magnetic properties including Pauli paramagnetism in USi$$_3$$ and UGe$$_3$$, spin fluctuations in USn$$_3$$ and antiferromagnetism in UPb$$_3$$. Among them, UPb$$_3$$ is an antiferromagnet below the N$'e$el temperature 32 K with a large electronic specific heat $$gamma$$ = 110 mJ/K$$^2$$mol. In this study we present the electrical resistivity measurement under high pressure up to 8 GPa. We found that at low pressure $$T_{rm N}$$ increases with increasing pressure. It has a maximum value 36 K at 3 GPa, then decreases with increasing pressure.In addition we observed an additional resistive anomaly followed by a steep decrease in resistivity below $$T_{rm N}$$ under pressure.The maximum pressure 8 GPa in the present study was not enough to suppress the antiferromagnetic transition.The critical pressure is estimated to be around 12 GPa.

Journal Articles

Single crystal growth and magnetic properties of ferromagnetic URhGe$$_2$$

Matsuda, Tatsuma; Haga, Yoshinori; Tokiwa, Yoshifumi; Andrei, G.; Yamamoto, Etsuji; Okubo, Tomoyuki*; Onuki, Yoshichika

Acta Physica Polonica B, 34(2), p.1071 - 1074, 2003/02

We have successfully grown a single crystal of uranium intermetallic compound URhGe$$_2$$. The temperature dependence of electrical resistivity shows highly anisotropic behavior. Two anomalies, which correspond to the magnetic ordering temperatures, were observed in the resistivity, magnetic susceptibility and specific heat measurements at $$T_{rm M1}$$= 30 K and $$T_{rm M2}$$=25 K. The magnetic susceptibility also shows a large uniaxial anisotropy with a magnetic easy-axis along the [010] direction.

Journal Articles

Magnetic ${it P}$-${it T}$ phase diagrams of CeSb and CeBi

Osakabe, Toyotaka; Hannan, A.*; Kawana, Daichi*; Kogi, Masafumi*; Kitazawa, Hideaki*

Acta Physica Polonica B, 34(2), p.1469 - 1472, 2003/02

no abstracts in English

Journal Articles

Superconductivity in CeRh$$_{2}$$Si$$_{2}$$ under pressure

Araki, Shingo; Nakashima, Miho*; Settai, Rikio*; Kobayashi, Tatsuo*; Onuki, Yoshichika

Acta Physica Polonica B, 34(2, Part1), p.439 - 442, 2003/02

no abstracts in English

Journal Articles

Systematic evolution of the Kondo peak in YbCu$$_{5-x}$$Ag$$_{x}$$

Okane, Tetsuo; Fujimori, Shinichi; Mamiya, Kazutoshi; Okamoto, Jun; Fujimori, Atsushi; Tsujii, Naoto*; Yoshimura, Kazuyoshi*

Acta Physica Polonica B, 34(2), p.1019 - 1022, 2003/02

no abstracts in English

Journal Articles

Single crystal growth and annealing temperature of ferromagnet URhGe

Yamamoto, Etsuji; Haga, Yoshinori; Matsuda, Tatsuma; Inada, Yoshihiko*; Settai, Rikio*; Tokiwa, Yoshifumi*; Onuki, Yoshichika

Acta Physica Polonica B, 34(2), p.1059 - 1062, 2003/00

no abstracts in English

Journal Articles

Magnetic properties of UFe10Si$$_{2}$$Bx (x = 0.1, 0.25, 0.5, 0.75, 1,1.25, 1.5, 1.75, 2)

Kimura, Akihiro; Yokoyama, Kaoru; Takeda, Shinji; Kodama, Shinichi

Acta Physica Polonica B, 34(2), p.1465 - 1468, 2003/00


Journal Articles

Nano-second isomers in neutron-rich Ni region produced by deep-inelastic collisions

Ishii, Tetsuro; Asai, Masato; Matsuda, Makoto; Ichikawa, Shinichi; Makishima, Akiyasu*; Hossain, I.*; Kleinheinz, P.*; Ogawa, Masao*

Acta Physica Polonica B, 32(3), p.739 - 746, 2001/03

no abstracts in English

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