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^ * 5 ©*^fWr*iTJj4- INIS-mf—14828 ^.^ 1995 ^ *"\* * *~ "** international Nuclear Physics •1-26,1995, International Nuclear PJiysics Conference August 21-26, 1995, Beijing, China BOOK OF ABSTRACTS Organized by China Institute of Atomic Energy Beijing 102413, China ACKNOWLEDGEMENTS The organizers would like to extend their gratitude to various institutions for their sponsorship or financial support, in particular: China National Nuclear Corporation Chinese Academy of Sciences National Natural Science Foundation of China Chinese Physical Society Chinese Nuclear Society Chinese Nuclear Physics Society China Academy of Engineering Physics Institute of Modern Physics, Chinese Academy of Sciences Shanghai Institute for Nuclear Research, Chinese Academy of Sciences International Union of Pure and Applied Physics (IUPAP) International Center of Theoretical Physics (ICTP) This book is the collection of abstracts submitted to the International Nuclear Physics Conference held on August 21-26, 1995 in Beijing, China. The organizers wish to thank all the authors for their contributions to the Conference. Conference Organization CONFERENCE CHAIRMAN: SunZuxun, President of CIAE INTERNATIONAL ADVISORY COMMITTEE A.Arima (Tokyo), J.Arvieux(S*ci*y). S.Auitin (Eaa Laming), J.B*ll(OakRkl(t), D.R.Bcj(Bueno«Aira), P BUii (Floraic), W.H.Breunlieh (Vienna) O.E.Brwn (Stony Brook), QJ.Ciikai(Debraix*). M.EINadi(Cain>X i D.H.Fenc(PhiladelfUa\ H.Feihtach (Cambridge), A.C.Foncca(LntHM). B.Froi»(Oifw»Yve(U), W.Grttoer (Frankfurt), H.A.Onmkr (Newport NcwtX S.Hmr(Ca«n). E.M.HenIey (Seattle), W. Y.Pmichy Hweog (Ttipei), I.Ioo(MiUno), Mliliihara(Saitama), S.SK»poor(Bombiy). T.D.Let (New York), EMigneco (Catania). M.Moehimky (Mexico). EMoya de Ovcm (Madrid), J.O.Newton(CanberraX LNilaon(UppMla), Yu.Ti.QpiK Mini (Dutna), I.OacrhJfld(Lund), R.A.R«i(UJn«ro). A.Richur(DaraM*), O.Sata (Sao Paulo), N.P.S*im»(Brook>av«i)i JScMffer(Ar|i»eX F.Sclbdup (JohwoesbureJ, R.Settz(Stmbourt). I.Sidc(B»jel), R.H.Sieat*m (Groningen), rUSped*(Dini>it**), J.Syn»«(Bfrkriey), LTiUni (Rehovot). PJ.T«no(Uv«ip9ol), M.Venn«i(Onay); J.Vcrvier (LouvanvLa-Neuve), E.W. Vo|t(VtfiGoavtrX WaafOaishaiic(Btyinft H. A WeHknmuller (Heidelberg), J. Wilczynki (Swiafc Otwock), OHWiD (3\ P.K. Ade Wht Huberb (Analcnbm). T.Y*nuaki (Tokyo), C.N.Yang (New York), Zhio Zhaagyao (Beijiing), Zhou GumgzhM (Brijinf), Zhu Ouangya (Bering). INTERNATONAL PROGRAM COMMITTEE R.Bock (Dumudl), R. F.Cactcn (Upton), C.Detraz(Caen), K.Ejiri(Ouka), W.Haxton(SeaHte)> HuJimin(Beijin«J, M.P.Lodier(VilUfen)b LO Moreno (Berkeley), S.Naganiiya (New York). P.Paul (Stony Brock), F.Ptasil(OakRid«iX H.Satz (Bielefisd), I.Skk (BeaelX CSimorini (Ugoan), P.Twin(Uverpool), O.Walecfca(Willuumbur|). WShUCh Yang liming Beijing). K.Yazaki (Tokyo)' LOCAL ORGANIZING COMMITTEE Chen Jiaer Chen Zemin Cheng Xiaowu DingDazhao DuXiangwan He Guozhu Hu Jimin Hu Jinxiu HuRenyu Huang Shengnian Huang Zuqia LiShounan Long Xianguan SunZuxun WeiBaowen WangChuanying Wu Shishu XiaYuanfii • XuGongou Xu Jincheng Yang Chuaxiang YangFujia Yang Liming YangZesen YuMin ZhaoEnguang Zheng Linsheng r Zheng Zhipcng Zhuo Yizhong LOCAL PROGRAM COMMITTEE Chen Yongshou Jiang Dongxing Liu Lianshou Liu Yiming Liu Yunzuo Lu Tan Luo YLxiao Ma Zhongyu Qiu Xijun Sa Benhao Shen Wcnqing Sun Hancheng Tang Jiayong Wang Fan Weng Peikiin Zeng Jinyan Zhang Huanqiao Zhang Zongyi Zhu Yongtai. CONFERENCE SECRETARIAT Xu Jincheng (CIAE) Secretary General Cai Dunjiu (CIAE), Guan Xialing (CIAE), Zhou Zuying (CIAE), Zhu Shengyun (CIAE). CONTENTS Invited Talks I.I Relativistic Nuclear Collisions 1.1 Mesons and Baryons in Nuclei ' 2.1 Hadron Structure and Quarks in Nuclei 3.1 Formation and Properties of Hot Nuclei 4.1 Nuclear Reactions at Low and Intermediate Energies S.I -Nuclear Structure 6.1 Radioactive Nuclear Beams 7.1 Nuclear Astrophysics 8.1 Fundamental Interaction and Symmetries 9.1 Experimental Technique and New Facilities 10.1 Applied Nuclear Physics 11.1 Author Index A.I I. Invited Talks 1-1 HADRON SPECTRA FROM LEAD COLLISIONS AT 160 GeV PER NUCLEON R. Stock Fachbereich Physik, Universitat Frankfurt, D-60486 Frankfurt, Germany In Nov. and Dec. 1994 the CERN Super Proton Synchrotron (SPS) accelerated Lead (^Pb) projectiles to a total energy of ca. 33 TeV, corresponding to 160 GeV per projectile nucleoa Seven major experiments took first data, the analysis of which is under way. The experiments are complementary to each other, covering physics observables that are relevant in the study of hadronic matter at extreme energy density. In particular, they search for a new phase of strongly interacting matter, predicted to exist by Lattice QCD theory at energy densities exceeding about 1.5-2.0 GeV per fin3, in which the confinement of quarks and gluons into individual hadron bubbles disappears. This should give rise to a continuous QCD state, asymptotically resembling a plasma of deconfined quarks and gluons, in analogy to the QED plasma state of electrons and nuclei making up the interior sections of stars and white dwarfs. First results from the Pb run indicate that conditions favourable towards creation of the new QCD phase are reached in central Pb+Pb collisions at this energy. Measurement of the total created transverse energy in the calorimeters of experiments NA49 and WA98 indicated that a total internal energy of about 2 TeV resides in the primordial reaction volume, leading to an estimate of the initial energy-density (before expansion) of the "fireball" amounting to about 2 GeV per fin3. The transversal size of the fireball is estimated by two-pion Bose correlation analysis in the experiments NA44 and NA49 to amount to 6-7 fin. Thus a large volume of high energy density is created in central Pb+Pb collisions, of dimensions one order of magnitude above the typical confinement dimension, of about 1 fin. Furthermore, NA49 observes about 2800 hadrons to be created per central Pb+Pb collision by means of tracking all charged reaction products in a large volume Tune Projection Chamber (TPC) array. Those hadrons carry the total internal fireball energy, of about 2 TeV. A new avenue of analysis opens up due to such high hadron (mostly pion) multiplicities per event Each event constitutes an ensemble of microscopic degrees of freedom, sufficient to define statistical features such as event temperature, kaon to pion, pion to proton, antiproton to proton ratios etc., that may lead to a thermodynamic description of individual events. Thus, if the transition to the new QCD phase occurs only rarely the relevant "candidate events" may be picked out by event by event analysis, selecting events of maximal strange- ness, content, maximal entropy, maximal rapidity density fluctuations, etc.. This new method will be described in view of the new data coming from the SPS Pb beam facility. 1-2 THE CHANGES IN PROPERTIES OF HADRONS IN NUCLEI AND NUCLEAR MATTER Mannque Rho Service de Physique Theorique, CEA Saclay 91191 Gif-sur-Yvette Cedex, France Combining chiral symmetry and conformal anomaly of QCD and using the con- cept of "mended symmetry," it is possible to discuss how hadron properties change in dense and/or hot medium in terms of the basic parameters appear- ing in effective Lagrangians for nuclei and nuclear matter. Phase transitions of hadronic matter under extreme conditions anticipated in relativistic heavy-ion collisions and dense compact-star matter are amenable to a systematic treat- ment, approaching from the hadronic phase. In particular the behavior of the negatively charged kaon, K~, in dense "nuclear-star" matter can be described in the same approach with a fascinating implication, on what could remain in the collapse of massive stars, "nuclear stars" or light-mass black holes suggested by Brown and Bethe. 1-3 MESON PRODUCTION FROM NUCLEAR COLLISIONS AND COMPRESSED HADRONIC MATTER. Eckart Grosse GSI, Postfach 11 05 02, D-64220 Darmstadt, Germany The observation of mesons allows a very sensitive test of the properties of the matter in the overlap zone of two colliding nuclei, which - at energies of 1 to 2 GeV/nucleon - is compressed to several times normal nuclear density. Pions and eta-mesons are- mainly originating from the decay of baryonic resonances; because of their large formation and absorption cross sections they give evidence for the thermal properties of the collision zone. Positive kaons on the other hand have a large mean free path and can leave the high density phase without beeing reab- sorbed. Experiments performed at the heavy-ion synchrotron SIS at Darmstadt show an enhanced kaon production for very heavy collision systems as compared to data taken with light ions. Such an enhancement can be due to multi-step processes in- volving intermediate delta-resonances. Theoretical arguments based on the expec- tation for a restoration of chiral symmetry at high baryon density favour a reduction of the kaon production threshold within the dense medium; this would result in an enlarged production yield at near-threshold energies. The mass' and energy dependence of meson production are investigated in sys- tematic studies with different heavy Ion beams from the SIS and by comparison to data taken at other accelerators (Bevalac, GANIL). A comparison of the data to transport model calculations enables estimates on the importance of different me* dium effects. A new series of pion and kaon production studies with proton beams of SATURNE impinging on light and heavy target nuclei is crucial for the interpretation of the heavy ion data. 1-4 NUCLEAR STRUCTURE STUDIES WITH LARGE GAMMA-RAY DETECTOR ARRAYS I.Y.Lee Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA Several large gamma-ray detector arrays are in operation now. For example, Gammasphere has been in use in an "early implementation" phase since April 93 with up to 36 BGO shielded Ge detectors and since March 95 with 55 detectors in the final configuration.
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