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2009年  第26卷  第S1期

Proceedings of the 3rd China-Japan-Korea Hardron and Nuclear Physics 2008 Symposium
显示方式:
Proceedings
Origin of Dynamically Generated Baryon Rsonances
T.Hyodo, D.Jido, A.Hosaka
2009, 26(5): 1-6. doi: 10.11804/NuclPhysRev.26.S1.001
摘要:
We study the origin of baryon resonances which are dynamically generated in the chiral unitary approach. We propose a natural renormalization scheme for the dynamical generation of resonances using the low energy chiral interaction and a general feature of the scattering theory. A deviation of a phenomenological scattering amplitude from the natural one is interpreted by an effective pole term interaction of genuine nature which can not be described by the mesonbaryon dynamics, reminiscent of the CDD pole. Applying the present method to physical mesonbaryon scatterings, we find that the Λ(1405) resonance is dominated by a mesonbaryon component forming a KNπΣ molecularlike structure, while the N(1535) resonance requires some pole contribution.

Status and Prospects of HIRFL Experiments
XU Hu-shan
2009, 26(5): 7-15. doi: 10.11804/NuclPhysRev.26.S1.007
摘要:
The research activities at HIRFL cover the fields of radio-biology, material science, atomic physics, and nuclear physics. This report mainly concentrates on the experiments of nuclear physics with the existing and planned experimental setups such as SHANS, RIBLL1, ETF, CSRe and PISA at HIRFL.
X(3872) and Bound State Problem of D0*0(D0 D*0)
LIU Yan-rui, LIU Xiang, DENG Wei-zhen
2009, 26(5): 16-21. doi: 10.11804/NuclPhysRev.26.S1.016
摘要:
We have performed a dynamical calculation of the bound state problem of D0D*0 by considering the pion and sigma meson exchange potential. Our preliminary analysis disfavors the molecular interpretation of X(3872) if we use the experimental D*Dπ coupling constant g=0.59 and a reasonable cutoff around 1 GeV, which is the typical hadronic scale. In contrast, there probably exists a loosely bound Swave BB* molecular state. Such a molecular state would be rather stable since its dominant decay mode is the radiative decay through B*→Bγ.
Hypernuclear Spectroscopy with Stable Heavy Ion Beams and Rareisotope Beams: HypHI Project at GSI and FAIR
T.R.Saito
2009, 26(5): 22-27. doi: 10.11804/NuclPhysRev.26.S1.022
摘要:
The international HypHI collaboration proposes to perform hypernuclear spectroscopy with stable heavy ion beams and rare isotope beams at GSI and FAIR in order to study neutron and proton rich hypernuclei and to measure directly hypernuclear magnetic moments for the first time. The project is divided into four phases. In the first Phase 0 experiment, the feasibility of precise hypernuclear spectroscopy with heavy ion beams will be demonstrated by observing π- decay channels of 3ΛH, 4ΛH and 5ΛHe with 6Li projectiles at 2 AGeV impinging on a 12C target. In the later Phases 1 through 3, studies of proton and neutron rich hypernuclei, direct measurements of hypernuclear magnetic moments and the spectroscopy of hypernuclei toward the nucleon driplines are planned.

Three and Four body Structure of Light Hypernuclei
E.Hiyama
2009, 26(5): 28-33. doi: 10.11804/NuclPhysRev.26.S1.028
摘要:
Hypernuclear physics has become very exciting owing to new epochmaking experimental data. Recent progress in theoretical and
experimental studies of hypernuclei and future developments in this field are discussed.

 
γray Spectroscopy of Hypernuclei: Recent KEK
MA Yue, S.Ajimura, K.Aoki, M.Dairaku, Fu Yuan-yong, H.Fujioka, T.Fukuda, et al.
2009, 26(5): 34-38. doi: 10.11804/NuclPhysRev.26.S1.034
摘要:
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 be emphasised. After that, the approved experimental proposal (E13) at JPARC facility will be introduced briefly.
Z+(4430) and Analogous Heavy Flavor States
DING Gui-jun
2009, 26(5): 39-43. doi: 10.11804/NuclPhysRev.26.S1.039
摘要:
We have studied Z+(4430)as a D*D1 molecule from the quark model, state mixing effect is considered by solving the coupled channel Schrdinger equation numerically. More precise measurements of Z+(4430)mass and width, partial wave analysis are helpful to understand its structure. If it lies below the D*D1 threshold, molecule interpretation with JP=1- is favored, and JP=0- can not be ruled out. Otherwise Z+(4430)may be a virtual state with JP=2-. The analogous heavy flavor mesons Z+bb and Z++bc are considered as well, and the masses predicted in our model are in agreement with the predictions from the potential model and QCD sum rule.
Ionic Debye Screening in Dense Liquid Plasmas Observed for Li+p, d Reactions with Liquid Li Target
J.Kasagi, H.Yonemura, Y-Toriyabe, A-Nakagawa, T.Sugawara, WANG Tie-shan
2009, 26(5): 44-48. doi: 10.11804/NuclPhysRev.26.S1.044
摘要:
Thick target yields of α particles emitted in the 6Li(d, α)4He and 7Li(p, α)4He reactions were measured for Li target in the solid and liquid phase. Observed reaction rates for the liquid Li are always larger than those for the solid. This suggests that the stopping power of hydrogen ion in the liquid Li metal might be smaller than in the solid. Using the empirically obtained stopping power for the liquid Li, we have deduced the screening potentials of the Li+p and Li+d reactions in both phases. The deduced screening potential for the liquid Li is about 500 eV larger than for the solid. This difference is attributed to the effect of liquefied Li+ ions. It is concluded that the ionic screening is much stronger than the electronic screening in a lowtemperature dense plasmas.
Random Phase Approximation in Relativistic Approach
MA Zhong-yu, YANG Ding, TIAN Yuan, CAO Li-gang
2009, 26(5): 49-54. doi: 10.11804/NuclPhysRev.26.S1.049
摘要:
Some special issues of the random phase approximation(RPA) in the relativistic approach are reviewed. A full consistency and proper treatment of coupling to the continuum are responsible for the successful application of the RPA in the description of dynamical properties of finite nuclei. The fully consistent relativistic RPA(RRPA) requires that the relativistic mean filed (RMF) wave function of the nucleus and the RRPA correlations are calculated in a same effective Lagrangian and the consistent treatment of the Dirac sea of negative energy states. The proper treatment of the single particle continuum with scattering asymptotic conditions in the RMF and RRPA is discussed. The full continuum spectrum can be described by the single particle Green’s function and the relativistic continuum RPA is established. A separable form of the paring force is introduced in the relativistic quasiparticle RPA.
α decay Branching Ratios to Rotational Band of Heavy Even-even and OddA Nuclei
REN Zhong-zhou, XU Chang
2009, 26(5): 55-58. doi: 10.11804/NuclPhysRev.26.S1.055
摘要:
By using a simple barrier penetration approach, we predict the αdecay branching ratios to members of groundstate rotational band of heavy eveneven No isotopes. We also extend our approach to calculate the αdecay branching ratios to the rotational band of heavy oddA nuclei. The theoretical branching ratios of αdecays are found in good agreement with the available experimental data.
Shell model Study of Neutron rich Λ-hypernucleus 10ΛLi
A.Umeya, T.Harada
2009, 26(5): 59-63. doi: 10.11804/NuclPhysRev.26.S1.059
摘要:
We investigate a Σmixing probability of a neutronrich Λhypernucleus 10ΛLi by using microscopic shellmodel calculations considering a ΛΣ coupling in the first order perturbation. The theoretical Σmixing probability in 10ΛLi is found to be about 0.48%,
due to the appearance of multiconfiguration Σ Nuclear excited states which can be strongly coupled with the Λ ground state in 10ΛLi.

 
Gamma Vibrational Bands and Chiral Doublet Bands in A≈100 Neutronrich Nuclei
ZHU Sheng-jiang, DING Huai-bo, J.H.Hamilton, A.V.Ramayya, CHE Xing-lai, et al.
2009, 26(5): 64-69. doi: 10.11804/NuclPhysRev.26.S1.064
摘要:
The level structures of neutronrich 105Mo, 106Mo, 108Mo and 110Ru nuclei in A ≈ 100 region have been carefully investigated by coincidence measurements of the prompt γrays populated in the spontaneous fission of 252Cf with the Gammasphere detector array. In 105Mo, onephonon K=9/2 and twophonon K=13/2 γvibrational bands have been identified. In 108Mo, onephonon γvibrational band is expanded and twophonon γvibrational band has been identified. Two similar sets of bands in 106Mo and 110Ru are observed to high spins, which have been proposed as the soft chiral γvibrational bands. The characteristics for these γvibrational bands and chiral doublet bands have been discussed.
Confirmation/Observation of Hindered E2 Strengths in 16,18C
H.J.Ong, N.Imai, D.Suzuki, H.Iwasaki, H.Sakurai, et al.
2009, 26(5): 70-74. doi: 10.11804/NuclPhysRev.26.S1.070
摘要:
The lifetime of the first excited 2+ state in 18C was measured using an upgraded recoil shadow method to determine the electric quadrupole transition. The measured mean lifetime is 18.9 ±0.9(stat)±4.4(syst)ps, which corresponds to a B(E2; 2+1→0+gs) value of (4.3± 0.2 ±1.0) e2fm4, or about 1.5 Weisskopf units. The mean lifetime of the first 2+ state in 16C was remeasured to be about 18 ps, about four times shorter than the value reported previously. This discrepancy was explained by incorporating the γray angular distribution measured in this work into the previous measurement. The observed transition strengths in 16,18C are hindered compared to the empirical transition strengths, indicating that the anomalous hindrance observed in 16C persists in 18C.
Pion Effect of Nuclear Matter in a Chiral Sigma Model
HU Jin-niu, Y.Ogawa, H.Toki, A.Hosaka, SHEN Hong
2009, 26(5): 75-78. doi: 10.11804/NuclPhysRev.26.S1.075
摘要:
We develop a new framework for the study of the nuclear matter based on the linear sigma model. We introduce a completely
new viewpoint on the treatment of the nuclear matter with the inclusion of the pion. We extend the relativistic chiral mean field
model by using the similar method in the tensor optimized shell model. We also regulate the pionnucleon interaction by considering
the formfactor and short range repulsion effects. We obtain the equation of state of nuclear matter and study the importance
of the pion effect.
Development of Polarized HD Target for Future LEPS Experiments at SPring-8
H.Kohri, M.Fujiwara, K.Fukuda, T.Kunimatsu, C.Morisaki, et al.
2009, 26(5): 79-82. doi: 10.11804/NuclPhysRev.26.S1.079
摘要:
We are carrying out hadron photoproduction experiments by using polarized photon beams at SPring8 in Japan. In 2005, we
started developing a polarized HD target for future experiments using both the polarized photon beams and the polarized target. The
polarized HD target is an idealistic target for experiments observing reactions with small cross sections because the HD does
not include heavy nuclei which produce many background events. The measurement of double polarization asymmetries is expected to give much important information to investigate the nucleon hidden structure, hadron photoproduction dynamics, and exotic hadron property. We report on the present status of the development of the polarized HD target at RCNP.
Study of Charged Pion Photoproduction on Deuteron with Tagged Photons
HAN Yun-cheng, N.Chiga, Y.Fujii, K.Futatsukawa, O.Hashimoto, K.Hirose, et al.
2009, 26(5): 83-87. doi: 10.11804/NuclPhysRev.26.S1.083
摘要:
The reactions γd→π-pp and γd→npπ+π- have been studied in an energy range from 0.8 to 1.1 GeV at the tagged photon facility of Laboratory of Nuclear Science, Tohoku University. Charged pions and protons in the final state were measured by using the Neutral Kaon Spectrometer (NKS2). The analysis of the γd→π-pp was mainly used to check the acceptance of the NKS2 and to calibrate the tagged photon energy. The photoproduction of the Δ++Δ- was identified in the γd→npπ+π- reaction. Since the data analyses are still in progress, we issue an interim report and preliminary results.

The Third Generation (e, e′K+) Λ Hypernuclear Spectroscopy at JLab
D.Kawama, A.Acha, I.Albayrak, D.Androic, O.Ates, et al.
2009, 26(5): 88-93. doi: 10.11804/NuclPhysRev.26.S1.088
摘要:
We are now preparing for the third generation (e, e′ K+) Λ 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.
MeV- and Sub-MeV-photon Sources Based on Compton
K.Kawase, M.Kando, T.Hayakawa, I.Daito, S.Kondo, et al.
2009, 26(5): 94-99. doi: 10.11804/NuclPhysRev.26.S1.094
摘要:
Recently we have constructed two facilities for generating photon beams in the MeV and subMeV energy regions by means of the
Compton backscattering with a laser and an electron beam at SPring8 and at Kansai Photon Science Institute of Japan Atomic Energy Agency(KPSIJAEA). The MeVphoton source at SPring8 consists of a continuouswave opticallypumped far infrared laser with a wavelength of 118.8 μm and an 8 GeV stored electron beam. Present MeVphoton flux is estimated to be 1.3×103
photons/s. On the other hand, the subMeVphoton source at KPSIJAEA consists of a pulse Nd∶YAG laser with a wavelength of
1 064 nm and a 150 MeV electron beam accelerated by microtron. In the first trial of the photon production in this source, backscattered photon flux is estimated to be 20 photons/pulse. Both the Compton backscattered photon sources have possibilities to be used for new tools in various fields such as nuclear physics, materials science, and astronomy.
Level Crossing of N*(1535)-hole and η Modes and Partial Restoration of Chiral Symmetry in ηmesic Nuclei
H.Nagahiro, D.Jido, E.E.Kolomeitsev, S.Hirenzaki
2009, 26(5): 100-103. doi: 10.11804/NuclPhysRev.26.S1.100
摘要:
We investigate the properties of the ηnucleus interaction by postulating the N*(1535) dominance for ηN system. Since the mass gap of N* and N is very close to the η meson mass, there is the possibility of the level crossing between the N*h and η modes in finite density. We postulate the N*(1535) resonance for the ηN system and consider quite distinct N* properties in finite density which are predicted by two independent chiral models. We find that we can obtain clearer information on the inmedium N* properties and also on the ηnucleus interaction through the formation of the ηmesic nuclei by (π, N) reactions under the appropriate experimental conditions, which can be performed at existing and/or forthcoming facilities like JPARC.
    π0 Photoproduction on Deuteron for Photon Energies from 0.6 to 1.15 GeV
F.Miyahara, H.Fukasawa, R.Hashimoto, T.Ishikawa, M.Itoh, et al.
2009, 26(5): 104-108. doi: 10.11804/NuclPhysRev.26.S1.104
摘要:
Differential and total cross sections of the γp→π0p and the γd→π0pn reaction were measured for photon energies between 640 and 1 150 MeV. The data have been compared with SAID and MAID model calculations. π0 photoproduction on the deuteron shows a strong suppression of the 2nd resonance which is clearly seen in the γp→π0p reaction.
Experiment of X-ray Generations Using Laser Compton Scattering at LINAC of SINAP
PAN Qiang-yan, XU Wang, LUO Wen, FAN Gong-tao, Yang Li-feng, et al.
2009, 26(5): 109-114. doi: 10.11804/NuclPhysRev.26.S1.109
摘要(1536)
摘要:
Laser Compton scattering(LCS) can generate Xrays or γrays with high brightness and easy controlled polarization by applying highpeakpower laser pulses to relativistic electron bunches. One of the most promising approaches to short pulsed Xray sources is the laser synchrotron source. It is based on LCS between picoseconds relativistic electron bunches and picoseconds laser pulses. A project of Shanghai laser electron gamma source with LCS method has been proposed on Shanghai synchrotron radiation facility. Before that, a prototype has been developed in the beamline of the linear accelerator at the Shanghai Institute of Applied Physics, Chinese Academy of Sciences. The LCS experiment was carried out by using the 107 MeV, 5 Hz, 1 ns, 0.1 nC electron bunches from the linear accelerator and the 18 ns, 10 MW peak power, Nd∶YAG laser pulses. In this communication, we describe the details and report the first results of this experiment.
A Simple Xray Spectrometer and PCbased Data Acquisition System for Newly Developed Xray Source Based on Laser Compton Scattering
LUO Wen, XU Wang, PAN Qiang-yan, XU Yi, FAN Gong-tao, et al.
2009, 26(5): 115-118. doi: 10.11804/NuclPhysRev.26.S1.115
摘要(1357)
摘要:
A simple Xray spectrometer and a PCBased Data Acquisition System(DAS) have been developed newly in Shanghai Institute of Applied Physics(SINAP), Chinese Academy of Sciences(CAS) for the measurement of the Xray source generated using laser Compton scattering. The system consists of liquid nitrogen cooled high resolution Si(Li) detector, electronics and a DAQ. The Si(Li) detector was designed and made by Center of Advanced Instruments in SINAP, CAS, it allows us to measure Xrays with the energy up to 60 keV and the energy resolution(FWHM) of 184 eV at 5.9 keV. We measured the system uncertainty was 0.2 eV and time drifting of detector was 0.05% both at 5.9 keV. The DAQ was based on ObjectOriented software LabVIEW 7.1, it has data online analysis and original data saved functions.
In flight (K-, N) Reactions for Study of Kaon nucleus Interaction
T.Kishimoto
2009, 26(5): 119-123. doi: 10.11804/NuclPhysRev.26.S1.119
摘要(1319)
摘要:
We would like to emphasize that the inflight (K-, N) reactions are particularly useful for the study of the Knucleus interaction. Since the reaction mechanism is well known, there is little ambiguity to derive the Knucleus interaction from the measured missing mass spectra. Here we discuss the missing mass spectra of the (K-, N) reactions on the 12C and 16O targets. The spectra show an appreciable amount of strength below the Knucleus threshold which indicates that the Knuclear potential is strongly attractive. Comparison of the missing mass spectra with theoretical calculations leads to a potential depth of around -190 MeV for the 12C(K-, n) reaction. A less deep potential of around -160 MeV reproduces well that of the 12C(K-, p) reaction. The difference can be due to isospin dependence of the interaction. Our data show that the Knucleus potential is very deep to realize kaon condensation in the core of neutron stars.
Recent HERMES Results on DVCS from Proton and Nuclear Targets
YE Hong-xue, MAO Ya-jun (on behalf of the HERMES Collaboration)
2009, 26(5): 124-128. doi: 10.11804/NuclPhysRev.26.S1.124
摘要(1264)
摘要:
Spin structure is one of the fundamental subjects in the study of nucleon structure. Recently it is found that Generalized Parton Distributions(GPDs) are related to the total angular momentum carried by partons, which offers a possible solution to the spin puzzle in the first time. We get access to certain GPDs by looking at the azimuthal angle asymmetries attributed to the interference between Deeply Virtual Compton Scattering(DVCS) and BetheHeilter processes in HERMES experiment. By measuring the asymmetry with respect to transverse target polarization from proton target, a modeldependent constraint on Ju vs Jd is obtained. Another worldwide unique channel is nuclear DVCS. The preliminary results on asymmetries with respect to beam spin and beam charge are
reported.
QCD Sum Rule Study of π1s States
CHEN Hua-xing, A. Hosaka, ZHU Shi-lin
2009, 26(5): 129-132. doi: 10.11804/NuclPhysRev.26.S1.129
摘要(1311)
摘要:
We study the states π1(1600) and π1(2015) in the QCD sum rule. We classify the tetraquark currents of the quantum numbers IGJPC=1-1-+, and find that the flavor structure (3  6 )(6  3 ) is preferred when using a diquarkantidiquark construction. By using both the SVZ and finite energy sum rules, we obtain a mass around 1.6 and 2.0 GeV, for the states with the quark contents qq and qs , respectively. We also study their decay patterns.
Anomalous Contributions in Kaon photoproductions
S.Ozaki, H.Nagaguri, A.Gisaja
2009, 26(5): 133-136. doi: 10.11804/NuclPhysRev.26.S1.133
摘要(1240)
摘要:
We study kaon photoproduction from the nucleon. Using the photon beam asymmetry, we discuss the couplings of the K and K* mesons with baryons. In previous studies of photoproductions, the K* coupling strength has been treated as parameters to reproduce experimental data. Here instead we propose to use the coupling strength which is derived from a microscopic escription. By including a higher order loop contribution induced by the QCD anomaly, we demonstrate that the experimental data can be explained well. The use of a microscopic description enables us a better understanding of the reaction dynamics which provides further basis of hadron dynamics.
Dibaryon Signals in NN Scattering Data and Further Measurement at COSY, LEPS and CSR
WANG Fan, PING Jia-lun, HUANG Hong-xia, PANG Hou-rong, C. W. Wong
2009, 26(5): 137-141. doi: 10.11804/NuclPhysRev.26.S1.137
摘要(1326)
摘要:
The NΔ and ΔΔ dibaryon resonances are studied by calculating the NN scattering phase shifts with explicitly coupling these dibaryon channels in a multichannel coupling calculation with two quark models. These quark models, the chiral quark model and quark delocalization color screening model, describe the NN S, Dwave phase shifts below the π production threshold quantitatively well. Both quark models predict the 1D2 resonance discovered in NN partial wave phase shift analysis and the J=1 or 3 isoscalar resonance recently reported by CELSIUSWASA Collaboration are NΔ5S2 and ΔΔ7S3 resonance, respectively. Further measurements at COSY, LEPS and Lanzhou Cooling Storage Ring(CSR) to check the ΔΔ resonance are discussed.
Meson Production in Heavy Ion Collisions at RHIC
SHI Xing-hua, CHEN Jin-hui, MA Yu-gang, CAI Xiang-zhou, MA Guo-liang
2009, 26(5): 142-147. doi: 10.11804/NuclPhysRev.26.S1.142
摘要(1329)
摘要:
We present  meson production in Cu+Cu and Au+Au collisions measured by the STAR experiment at RHIC.The hadronic decay mode → K+K-is used in the analysis.The yields for  meson in Cu+Cu and Au+Au collisions at a given beam energy are scaled by the number of participant.The Npart normalized  meson yields in heavy ion collisions over those from p+p collisions are larger than 1 and increase with collision energy.These results suggest that the source of enhancement of strange hadrons is related to the formation of a dense medium in high energy heavy ion collisions and can not be only due to canonical suppression of their production in smaller systems.We also present STAR results on the  meson elliptic flow v2 from sNN=200 GeV Cu+Cu at RHIC.The elliptic flow in Cu+Cu system that has the similar relative magnitude and qualitative features as that in Au+Au system.The observations imply the hot and dense matter with partonic collectivity has been formed in heavy ion collisions at RHIC. However, eccentrality normalized v2, v2/(nqεpart) is lower for Cu+Cu than for Au+Au collisions at 200 GeV.So this might indicate thermalization has not been reached in 200 GeV Cu+Cu collisions.
Study of Σ*-Δ Interactions
DAI Lian-rong, BAI Li-hui, ZHANG He, #, LIU Jia, FU Yao, TONG De-xin
2009, 26(5): 148-152. doi: 10.11804/NuclPhysRev.26.S1.148
摘要(1257)
摘要:
We study the Σ*Δ interaction in the chiral SU(3) quark model and in the extended chiral SU(3) quark model. In these two models, the shortrange interaction mechanism are totally different, one is from the onegluon exchange and another is from the vector meson exchange. The possible reasons of forming strangeness -1 bound states are given. Comparisons between the cases with and without quark exchange effect are made. The results show the quark exchange effect does give attractions to (Σ*Δ)ST=0 52 and (Σ*Δ)ST=3 12 systems, which means the special symmetry is important. Also, we make some analysis on chiral field effect, our results show that the σ exchange dominantly provides the attractive interaction for these two states.
Study of Proton Resonances in 22Mg by Resonant Elastic Scattering of 21Na+p and Its Astrophysical Implication in 18Ne(α, p)21Na Reaction Rate
HE Jian-jun, S.Kubono, T.Teranishi, M.Notani, H.Baba, et al.
2009, 26(5): 153-157. doi: 10.11804/NuclPhysRev.26.S1.153
摘要(1328)
摘要:
Proton resonant states in 22Mg have been investigated by the resonant elastic scattering of 21Na+p. The 21Na beam with a mean energy of 4.00 MeV/u was separated by the CNS radioactive ion beam separator(CRIB) and bombarded a thick(CH2)n target. The energy spectra of recoiled protons were measured at scattering angles of θcm ≈172° and 146°, respectively. A new state at 7.06 MeV has been observed clearly and another new one at 7.28 MeV is tentatively identified due to its low statistics. The roton resonant parameters were deduced from an Rmatrix analysis of the differential cross section data. The astrophysical esonant reaction rate for the 18Ne(α, p)21Na reaction has been estimated, and it is about five times larger than that assumed before.
Signature Inversion in Odd-odd Nuclei
LIU Min-liang, ZHANG Yu-hu, ZHOU Xiao-hong, GUO Ying-xiang, LEI Xiang-guo, GUO Wen-tao
2009, 26(5): 158-164. doi: 10.11804/NuclPhysRev.26.S1.158
摘要(1195)
摘要:
Signature inversion in oddodd nuclei is investigated by using a proton and a neutron coupling to the coherent state of the core. Two parameters are employed in the Hamiltonian to set the energy scales of rotation, neutronproton coupling and their competition. Typical level staggering is extracted from the calculated level energies. The calculation can approximately reproduce experimental signature inversion. Signature inversion is attributed to the rotational motion and neutronproton residual interaction having reversed signature splitting rules. It is found signature inversion can appear at axially symmetric shape and highK band.
 
Eigenvalues of Large Matrices
ZHAO Yu-min
2009, 26(5): 165-167. doi: 10.11804/NuclPhysRev.26.S1.165
摘要(1284)
摘要:
We recently performed a series of improvement on evaluation of eigenvalues without complicated iterations. In this work we first discuss evaluation of the lowest eigenvalue for given systems, by which one conveniently obtains the value of the lowest eigenvalue based on the dimension and width of given matrix. We also discuss a strong correlation between eigenvalues and diagonal matrix elements for large matrices, by which one is able to predict eigenvalues approximately without iterations.
Formation of Superheavy Nuclei in Massive Fusion Reactions
FENG Zhao-qing, JIN Gen-ming, LI Jun-qing, Scheid Werner
2009, 26(5): 168-168. doi: 10.11804/NuclPhysRev.26.S1.168
摘要(1445)
摘要:
Within the concept of the dinuclear system(DNS), by incorporating the coupling of the relative motion to the nucleon transfer process, a dynamical model is proposed for describing the formation of superheavy residue nucleus in massive fusion reactions, in which the capture of two heavy colliding nuclei, the formation of compound nucleus and the deexcitation process are calculated using empirical coupled channel model, solving master equation numerically and statistical theory, respectively. By using the DNS model, the evaporationresidue excitation functions in the 48Ca induced fusion reactions and in the cold fusion reactions are investigated systematically and compared with available experimental data. Optimal evaporation channels and combinations as well as the corresponding excitation energies are proposed. The possible factors that influencing the isotopic dependence of the production cross sections are analyzed. The formation of the superheavy nuclei based on the isotopes U with different projectiles are also investigated.
Ground State Structure of Hs Super-heavy Isotopes
MA Long, ZHOU Xiao-hong, ZHANG Hong-fei, GAN Zai-guo, LI Jun-qing
2009, 26(5): 175-180. doi: 10.11804/NuclPhysRev.26.S1.175
摘要(1273)
摘要:
The ground state properties of Hs nuclei studied in the framework of the relativistic mean field theory revealed that more stable isotopes are located on the proton abundant side of the chain. The last stable nucleus to the proton drip line is 256Hs. The most stable unknown Hs nucleus may be 268Hs. The density dependent delta interaction pairing is used to improve the BCS pairing correction, which results in more reasonable singleparticle energy level distributions and nucleon occupation, and it is shown to be available to describe the properties of nuclei in the superheavy region.
Probing Nuclear Symmetry Energy with Giant Dipole Resonances in Finite Nuclei
CAO Li-gang, MA Zhong-yu
2009, 26(5): 181-184. doi: 10.11804/NuclPhysRev.26.S1.181
摘要(1284)
摘要:
The relationship between the centroid energies of the isovector giant dipole resonance of finite nuclei and the symmetry energy has been studied. It is found the excitation energies of the dipole resonance in finite nuclei are correlated linearly with the symmetry energy at and below the saturation density. This linear correlation leads to the symmetry energy at the saturation density at the interval 33.0 MeV ≤ S(ρ0) ≤ 37.0 MeV, and the symmetry energy at ρ = 0.1 fm-3 at the interval 21.2 —22.5 MeV. It is proposed that a precise measurement of the dipole mode in nuclei could set up an important constraint on the equation of state for nuclear matter.
 
The First Isochronous Mass Measurements at CSRe
TU Xiao-lin, XU Hu-shan, WANG Meng, XIA Jia-wen, MAO Rui-shi, et al.
2009, 26(5): 185-189. doi: 10.11804/NuclPhysRev.26.S1.185
摘要(1458)
摘要:
With the commissioning of the Cooler Storage Ring at the Heavy Ion Research Facility in Lanzhou (HIRFLCSR), a pilot experiment operating the CSRe in isochronous mode to test the power of HIRFLCSR for measuring the mass of the shortlived nucleus was performed in December of 2007. The fragments with A/q = 2 of 36Ar were injected into CSRe and their revolution frequencies were measured with a fast time pickup detector with a thin foil in the circulating path of the ions. The preliminary result is presented. The result shows the potential of CSRe for mass measurements of shortlived nuclei.
Charmed Baryon in Diquark Model
WANG Qing-wu, ZHANG Peng-ming
2009, 26(5): 190-193. doi: 10.11804/NuclPhysRev.26.S1.190
摘要(1219)
摘要:
A diquark model is used to investigate singlecharmed baryons. In this model, baryon is composed of two diquarks and an antiquark. Masses of lowest lying states with JP=1/2± are obtained. Baryons in our results are as heavy as other theoretic predictions and we suggest that the fivequark components should be considered in any threequark model for studying the charmed baryons.