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21.
T.Nagae 《中国物理C(英文版)》2010,34(9)
We have held an inauguration ceremony of the Japan Proton Accelerator Research Complex (J-PARC) on July 6, 2009, celebrating the completion of its construction. Now, the beam commissioning of the 50 GeV main proton synchrotron is in progress to improve the beam intensity and quality. A lot of important experimental programs in Nuclear Physics are waiting for the beam. In this report, I introduce some examples. 相似文献
22.
The deformations of light Λ hypernuclei are studied in an extended nonrelativistic deformed Skyrme-Hartree-Fock approach with realistic modern nucleonic Skyrme forces,pairing correlations,and a microscopical lambda-nucleon interaction derived from Brueckner-Hartree-Fock calculations.Compared to the large effect of an additional Λ particle on nuclear deformation in the light soft nuclei within relativistic mean field method,this effect is much smaller in the nonrelativistic mean-field approximation. 相似文献
23.
在手征SU(3)夸克集团模型下,通过共振群方法(RGM)计算了双Λ超核~6_(ΛΛ)He, ~5_(ΛΛ)He, ~5_(ΛΛ)H, ~4_(ΛΛ)He和~4_(ΛΛ)H的结合能.结果表明,假定双Λ超核具有双Λ集团和壳心核集团构成的两集团结构,得到的~6_(ΛΛ)He超核的结合能与实验值基本吻合,表明手征SU(3)夸克集团模型不仅能较好地描述重子谱、N-N和Y-N相互作用及轻Λ超核的结合能,也能较好地描述Y-Y相互作用及双Λ超核的结合能.使用相同的模型参数,计算了轻双Λ超核~5_(ΛΛ)He, ~5_(ΛΛ)H, ~4_(ΛΛ)He和~4_(ΛΛ)H的结合能,指出了它们存在的可能性. 相似文献
24.
At Jefferson Laboratory the experiment E02-017 was carried out to investigate the fission associated with kaons in the hypernuclei-producing interaction p(e,K+e')A. The newly installed high resolution kaon spectrometer (HKS) in Hall C was used as a key instrument to identify kaons. This paper introduces the HKS hardware and describes the way the kaons are identified. Maintaining most of the kaons (nearly 100%) in the data, HKS identifies kaons with a purity of 67% in this experiment. The resolution of the kaon target time reconstructed by HKS reaches 0.42 ns. 相似文献
25.
High-energy heavy-ion collisions produce abundant hyperons and nucleons. A dynamical coalescence model coupled with the ART model is employed to study the production probabilities of light clusters, deuteron (d), triton (t), helion (3He), and hypertriton (Λ3H) at subthreshold energy of Λ production (≈ 1 GeV per nucleon). We study the dependence on the reaction system size of the coalescence penalty factor per additional nucleon and entropy per nucleon. The Strangeness Population Factor (S3 / (3He × (Λ/p))) shows an extra suppression of hypertriton comparing to light clusters of the same mass number. This model predicts a hypertriton production cross-section of a few μb in 36Ar+36Ar, 40Ca+40Ca and 56Ni+56Ni in 1 A GeV reactions. The production rate is as high as a few hypertritons per million collisions, which shows that the fixed-target heavy-ion collisions at CSR (Lanzhou/China) at Λ subthreshold energy are suitable for breaking new ground in hypernuclear physics. 相似文献
26.
Investigation on isospin symmetry in light Lambda hypernuclei is one of the most important issues in hypernuclear physics. In order to know the influences introduced by a single Lambda hyperon, we study the binding energy difference of mirror hypernuclear pair with mass A=16, 18, 28, 40, and 42 using a time-odd triaxial relativistic mean field theory. Effects as the spin-orbit interaction, the time-odd component of vector fields, the core polarization, the proton-neutron mass difference, and the center-of-mass energy correction are self-consistently considered. Compared to the reported results of ordinary nuclei, the binding energy difference of mirror hypernuclei shows trivial change. With core polarization modified by an impurity hyperon, the isospin nonconserving effect between proton and neutron is hardly reduced for nuclei in study. 相似文献
27.
D.Kawama A.Acha I.Albayrak D.Androic O.Ates P.Baturin B.Beckford W.Boeglin A.Bruell C.Chen M.Christy R.Ent H.Fenker Y.Fujii M.Furic D.Gaskell S.Gogami O.Hashimoto T.Horn V.Hungerford Ed M.Jones H.Kanda C.Keppel M.Kohl L.Kramer Y.Li A.Liyanage P.Markowitz T.Maruta A.Matsumura S.N.Nakamura T.Petkovic B.Raue J.Reinhold T.Seva A.Shichijo G.Smith L.Tang N.Taniya W.Vulcan T.Walton S.A.Wood T.Yamamoto Z.Ye K.Yokota L.Yuan L.Zhu 《原子核物理评论》2009,26(Z1)
We are now preparing for the third generation (e,e′K~+) A hypernuclear spectroscopic experiment at Hall C,Jefferson Lab (USA).The goal of the experiment is the precise spectroscopy of hypernuclei in wide mass region.We have constructed a new high resolution electron spectrometer "HES" dedicated to (e,e′K~+) hypernuclear study in Japan and it was shipped to JLab in February,2008.We will discuss about the physics of the (e,e′K~+) hypernuclear study at JLab and report the current preparation status of the third generatrion experiment. 相似文献
28.
New experimental data on the binding energyB
λλ
ofλλ6He, reported very recently, come up with the valuesB
λλ
= 725 ±0.14 MeV and ΔBλλ = 101 ±0.2 MeV which are substantially lower than the old dataB
λλ
= 109 ±0.8 MeV and ΔBλλ = 4.7±10 MeV in use in literature since 1966. In view of the new data we decided to undertake a re-study of the
λλ
6
He hypernucleus using the same three-body model (α-λ-λ) with a simple coordinate space variational approach which was employed
earlier with the old data onλλ/6He. After fitting different λ-λ potentials to the new data of
λλ
6
He we have applied our method to study some double-λ hypernuclei in light, medium and heavy mass regions and have determined
the structural quantities like Bλλ, the r.m.s. values of core-λ (〈rcore-λ〉〉) and λ-λ (〈rλ-λ〉〉) distances theoretically. The core-λ interaction considered is of Woods-Saxon type. The strength and the range of the core-A
potential have been adjusted to reproduce the λ-binding energy(B
λ)
. These are in good agreement with the relativistic mean field (RMF) results. Our study shows that the λ-λ bonding energy
ΔBλλ decreases with increasing mass number from
λλ
10
Be to
λλ
210
Pb of a double-A hypernucleus 相似文献
29.
MA Yue S.Ajimura K.Aoki M.Dairaku Fu Yuan-yong H.Fujioka T.Fukuda K.Futatsugawa K.Hosomi W.Imoto M.Kawai Y.Kakiguchi S.Kinoshita T.Koike N.Maruyama M.Mimori S.Minami Y.Miura K.Miwa Y.Miyagi T.Nagae D.Nakajima H.Noumi K.S hirotori T.Suzuki T.Takahashi T.N.Takahashi K.Tanida N.Terada A.Toyoda K.Tsukada M.Ukai ZHOU Shu-hua H.Tamura 《原子核物理评论》2009,26(Z1)
In this proceeding,we will first outline the experimental setup and main results of the most recent hypernuclear γ-ray spectroscopy experiment (KEK-E566) performed at KEK-PS K6 beam line.The main feature and characteristics of this type of research will he emphasised.After that,the approved experimental proposal (E13) at J-PARC facility will be introduced briefly. 相似文献
30.
We show how to treat the dynamics of an asymmetric three-body system consisting of one heavy and two identical light particles
in simple coordinate space variational approach. The method is constructive and gives an efficient way of resolving a three-body
system to an effective two-body system. It is illustrated by explaining the structural properties of some nuclei of current
interest, namely halo nuclei and double-λ hypernuclei. The ansatz used here may be of value in a number of three particle
problems of similar nature. 相似文献