Academia.edu no longer supports Internet Explorer.
To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser.
2005, Nuclear Physics A
Hypernuclei represent the first steps towards an extension of the periodic system into the sector of strangeness and thus add a third dimension to our evolving picture of nuclei. They provide a large variety of new and exciting perspectives ranging from new dynamical symmetries in hypernuclei spectra, non-mesonic weak decays, and the interplay of the quark-exchange and meson-exchange aspects of strong baryon-baryon forces in the flavor SU(3) world. Furthermore, double hypernuclei may provide a doorway towards exotic quark states. In the near future, electroproduction experiments at TJNAF and MAMI-C will add more detailed information on the structure of single hypernuclei states. On the long term, experiments at the Japanese hadron facility and the high energy storage ring for antiprotons at the future GSI accelerator facility will allow us to extend high resolution γ-ray studies also into the domain of double hypernuclei.
2007
Exchange reactions with Dick Dalitz 11 A. Gal The hypernuclear physics heritage of Dick Dalitz (1925-2006) Spectroscopy of Hypernuclei 17 Y. Ma et al. γ-ray spectroscopy study of 11 Λ B and 12 Λ C* 21 M. Ukai et al. Observation of the 7 MeV excited spin-flip and nonspin-flip partners in 16 Λ O by γ-ray spectroscopy* 25 T. Koike et al. Next generation hypernuclear γ-ray spectrometer: Hyperball-J 29 J.J. LeRose et al. Hypernuclear spectroscopy in JLab's Hall A 33 S. Marrone et al. 9 Λ Li and 16 Λ N high resolution spectroscopy by electron scattering at Jefferson Lab in Hall A 37 F. Cusanno et al. High resolution hypernuclear spectroscopy at Jefferson Lab, Hall A: The experimental challenge 41 O. Hashimoto et al. Recent results of the JLab Hall C hypernuclear experiment E01-011 47 A. Margaryan RF picosecond timing technique and new possibilities for hypernuclear studies 51 S.N. Nakamura Future hypernuclear experiments at JLab 57 M. Agnello et al. The FINUDA Collaboration A study of 7 Λ Li production with FINUDA 61 P. Gianotti FINUDA: A hypernuclear factory 67 A. Feliciello One step beyond: Hypernuclear γ-ray spectroscopy with FINUDA 73 T. Nagae Strangeness nuclear physics at J-PARC 79 P. Achenbach Probing hypernuclei at PANDA and at MAMI-C 85 D.J. Millener Gamma decay studies of hypernuclei-Theoretical situation Weak Decays 93 M. Agnello et al. The FINUDA Collaboration Study of the proton weak decay of 12 Λ Cg.s. with FINUDA*
Nuclear Physics A, 2013
At the Mainz Microtron hypernuclei are produced by (e, e K) reactions. A dedicated kaon spectrometer located at 0 • with respect to the electron beam is used to detect kaons emitted in forward direction thus tagging events involving strangeness production. By measuring the momenta of pions from two body weak decays using high resolution magnetic spectrometers one gains direct access to the ground state masses of the produced hyperfragments. At FAIR the PANDA Collaboration intends to produce double-hypernuclei by numbers with an antiproton beam and study their high resolution γ-spectroscopy thus providing for the first time precise information on the level structure of these nuclei. The status of both experiments is reviewed.
Nature Reviews Physics, 2021
A hypernucleus, a sub-atomic bound system with at least one hyperon, is a great test ground to investigate nuclear forces and general baryonic interactions with up, down and strange quarks. Hypernuclei have been extensively studied for almost seven decades in reactions involving cosmic-rays and with accelerator beams. In recent years, experimental studies of hypernuclei have entered a new stage using energetic collisions of heavy-ion beams. However, these investigations have revealed two puzzling results related to the lightest three-body hypernuclear system, the so-called hypertriton and the unexpected existence of a bound state of two neutrons with a Λ hyperon. Solving these puzzles will not only impact our understanding of the fundamental baryonic interactions with strange quarks, but also of the nature of the deep interior of neutron stars. In this Perspective, we discuss approaches to solving these puzzles including experiments with heavy-ion beams and the analysis of nuclear emulsions using state-of-the-art technologies. We summarise ongoing projects and experiments at various facilities worldwide and outline future perspectives.
Nuclear Physics A, 1997
Proceedings of The 8th International Workshop on Chiral Dynamics — PoS(CD15), 2016
Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015), 2017
2000
In order to understand baryon-baryon interactions under flavored SU(3), one must investigate the interaction between nucleons and hyperons, which can be accessed so far mainly by studying hypernuclei. Since hyperons are expected to be one of the main ingredients of neutron dense matter such as neutron stars, understanding the interaction including hyperons is essential to understand our universe. Even though a number of new experimental techniques have been developed for the hypernuclear spectroscopy in the last decade, our knowledge is still limited to a small number of hypernuclei on/near the β-stability line. Magnetic moments of hypernuclei are very sensitive scope on the wave function of hyperons in hypernuclei, however, magnetic moments have never been measured on any of hypernuclei.
Hyperfine …, 2012
Hypernuclear research will be one of the main topics addressed by the PANDA experiment at the planned Facility for Anti-proton and Ion Research FAIR at Darmstadt, Germany. A copious production of Ξ -hyperons at a dedicated internal target in the stored anti-proton beam is expected, which will enable the high-precision γ-spectroscopy of double strange systems for the first time. In addition to the general purpose PANDA setup, the hypernuclear experiments require an active secondary target of silicon layers and absorber material as well as high purity germanium (HPGe) crystals as γ-detectors. The design of the setup and the development of these detectors is progressing: a first HPGe crystal with a new electromechanical cooling system was prepared and the properties of a silicon strip detector as a prototype to be used in the secondary target were studied. Simultaneously to the hardware projects, detailed Monte Carlo simulations were performed to predict the yield of particle stable hypernuclei. With the help of the Monte Carlo a procedure for ΛΛ -hypernuclei identification by the detection and correlation of the weak decay pions was developed.
International Journal of Modern Physics E-Nuclear Physics, 2009
Physical Review Letters, 2013
Progress of Theoretical Physics Supplement, 2010
The present status of hypernuclear physics is outlined and the future prospect of this field is described on the basis of the works presented in this volume.
Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015), 2017
Nuclei with double strangeness, S = 2 hypernuclei, have given us very little knowledge, so far. Regarding double- hypernuclei, interaction will be attractive, but very weak, by 6 He of the NAGARA event, which constrains interpretations of the other five events. -nucleus interaction was studied via twin hypernuclei and missing mass spectrum for (K-, K +) reactions and potential well depth can be estimated to be around (14~16)MeV. The first evidence of the presence for a deeply bound -nuclear system, named the KISO event, has been reported suggesting that the -nucleus interaction is attractive. Four experiments wait for beam at J-PARC to study and/or -nucleus interaction and the H dibaryon.
2017
The production of strangeness on the nucleon and hyperon and hypernuclear production in heavy ion collisions at relativistic energies and in antiproton annihilation on nuclei is discussed. The reaction process is described by transport theory with focus on S = -2 channels and a comparison of different model interactions. The interactions of hyperons in nuclear matter is investigated in a novel SU(3) approach. An outlook to the S = -3 sector and Ω -physics is given.
Nuclear Physics A, 2013
Nuclear Physics A, 2000
We present a nonrelativistic transition potential for the weak strangeness-changing reaction ΛN → NN. The potential is based on a one meson exchange model (OME), where, in addition to the long-ranged pion, the exchange of the pseudoscalar K, η, as well as the vector ρ, ω, K * mesons is considered. Results obtained for different hypernuclear decay observables are compared to the available experimental data.
2011
We are at the verge of a new impact from hypernuclear experiments planned or already operative at various laboratories all over the world. The complementary of these different experimental approaches to hypernuclei provides a wide basis for a comprehensive understanding of strange hadrons in cold hadronic matter. High precision studies of light Λ hypernuclei, spectroscopy of double ΛΛ nuclei and the properties of antihyperons in nuclei are examples for the outstanding challenges for hypernuclei research in the next decade.
Proceedings of The IX International Conference on …, 2007
The physics of the weak decay of hypernuclei is briefly reviewed from a theoretical point of view. Special regard is devoted to the recent progress concerning the determination of the non-mesonic decay widths and the asymmetry parameters. While convincing evidence has been achieved for a solution of the long-standing puzzle on the ratio Γn/Γp, the discrepancies between theory and experiment on the decay asymmetries clearly highlight the exigence of dedicating further efforts in exploring new aspects of the dynamics underlying the non-mesonic weak decay.
Nuclear Physics A, 2007
The international HypHI collaboration is proposing a hypernuclear spectroscopy with stable heavy ion beams and rare isotope beams at GSI and FAIR in order to study neutron/proton rich hypernuclei and eventually to measure hypernuclear magnetic moments. As Phase 0 of the HypHI project, we propose the feasibility study of heavy ion induced hypernuclear spectroscopy by observing a mesonic weak decay from 3 Λ H, 4 Λ H and 5 Λ He with 6 Li beams at 2 A GeV impinging on a 12 C target. The physics motivations, experimental setup and the expected results will be discussed.
Loading Preview
Sorry, preview is currently unavailable. You can download the paper by clicking the button above.