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Nuclear Tracks in Solids (Abstracts) c'/vniH22V- -•'>'•'S INIS-mf—13731 ONAL IFERENCE ON NUCLEAR TRACKS IN SOLIDS (ABSTRACTS) 7-11 September, 1992 Organized by China Institute of Atomic Energy (CIAE) Initiated by International Nuclear Track Society (INTS) Chinese Nuclear Society (CNS) Chinese Nuclear Physics Society (CNPS) China Institute of Atomic Energy (CIAE) Sponsored by China National Nuclear Corporation (CNNC) Chinese Academy of Sciences (CAS) National Natural Science Foundation of China (NNSFC) China Institute of Atomic Energy (CIAE) International Center for Theoretical Physics (ICTP) Third World Academy of Sciences (TWAS) 16TH INTERNATIONA CONFERENCE ON NUCLEAR TRACKS IN SOLIDS Beijing September 7-11, 1992 ABSTRACTS Organizing Committee Chairmant Sun Zuxun (Beijing) Members: Cheng YuUn (Shanghai) Chen Zhonglin (Beijing) Cui Huanhua (Beijing) Feng Yushui (Beijing) Guo Shi-Lun (Beijing) Hu Ruiying (Guangzhou) U Xianhai (Xi' an) Liu Shunsheng (Changsha) Pang Deling (Shanghai) Shen Ronglin (Beijing) Sun Guangyu (Beijing) Wang Shicheng (Beijing) Wsu Huishan (Beijing) Wu Yonggen (Beijing) Zhao Chongde (Beijing) Zhao Yunlong (Beijing) Advisory Committee Members: Guo Shi-Lun (Beijing) He Zehui (Beijing) Huang Shengnian (Beijing) U Shounan (Beijing) Sun Hancheng (Beijing) Sun Zuxun (Beijing) Tang tin (Beijing) Wang Chuanying (Beijing) Yan Shuheng (Beijing) Yang Fujia (Shanghai) Yang Tianlu (Beijing) Zhang Jiahua (Shanghai) Zhou Yuanquan (Beijing) International Committee President: S.-L. Guo (China) Members, E. V. Benton (USA) R. Brandt (Germany) L, T. Chadderton (Australia) W.G. Gross (Canada) S. A. Durrani (UK) K.K.Dwiv«li (India) W. Enge (Germany) G. Espincsa (Mexico) R.L. Fleischer (USA) M. Fuji! (Japan) I.Hunyadi (Hungary) R. Hie (Yugoslavia) H. A. Khan (Pakistan) M.M.Monnin (France) D. F. C sullivan (Ireland) J.Palfalvi (Hungary) V.P.Perelygin (Russia) M.Sohrabi (Iran) L.Tommesino (Italy) H.S.Virk (India) Scientific Secretary s Guo Shi-Lun (Beijing) 16th International Conference on Nuclear Tracks in Solids, Sept 7—11, 1992, Beijing, China Preliminary Programme Thursday Sunday, Sept. 6 Monday, Sept. 7 Tuesday, Sept. 8 Wednesday, Sept. 9 Friday, Sept 11 Sept. 10 8 i 30—10 : 00 Registration Radon I Neutron I Track Development I 10 » 00—10 : 30 Coffee+Poster I Coffee+Poster I Coffee+Poster IV 10 : 00—11 « 30 10 * 00—12 : 00 G 1 :Life Science+ R Welcome Addresses / I : Space Research / I -Filters 10 « 30—12 •- 00 Registration Neutron I E Opening Lecture 1 I : Nuclear Physics I A I I -Track Development I Parallel Sessions < 11 s 30 Photograph T ll:Radon I I *Nuclear Physics I \ 1 :Radon V W I: Radon I A 12 « 00—14 '• 00 Lunch Lunch Lunch L Lunch L + Detector+ 14 « 00—15 i 30 Track Formation I Geoscjence I M I Track Observation N 15 i 30—16 • 30 14 « 00—18 : 00 Coffee+Poster I Scientific Coffee+Poster I G Coffee+Poster I Registration Visit T / 1 : Track Formation I 16 : 30—18 t 00 (plenary) O t I :Geoscience I M fcncluding Remarks Parallel Sessions Nuclear Physics I B 11: Radon IV S 18 : 30 19 : 00 Reception Peking Opera Banquet 19 : 30 INTS' Meeting CONTENTS •••••• I Monday, Sept. 7 • • • ••••• 3 Tuesday, Sept. 8 •••• •••••••••••••• • 15 Wednesday, Sept. 9 •••••••••••••••••••••• •••• 37 rixKlcLjf y oCJjfl« JL JL %J\J Supplements •••• •••••• 139 Posters •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 203 Monday, Sept. 7 / Tuesday, Sept. 8, Poster I 205 Track Formation ••••••••••••••••••••••••••••• 209 Detectors ••••••*•••••••••••••••••••••••••••••••••••••* 219 Track Development 233 Track Observation 251 Wednesday, Sept. 9, Poster II 259 Nuclear Fnysics ••••• • zoo Space Research • 279 ^seutron ••••••••••••••••••••••••••••••••••••••••••••• 28 J Geoscience •••••••••••••••••••••••••••••••••••••••••• 301 life and Environmental Science 315 Friday, Sept. 11, Poster III •••• 331 Radon •••••••••••••••••••••••••••••••••••••••••••••••• 335 Filters and Material Science 371 ORAL PRESENTATIONS Monday, Sept. 7 Opening lecture (Chair: Guo, S. -L. ) Price, P. B. (Berkeley), ADVANCES IN SOLID STATE NUCLEAR TRACK DETEC- TORS (45)' Track Formation I (Chair. Durrani, S. A. ): Chadderton, L. T. (Canberra), THEORY OF LATENT RADIATION DAMAGE IN POLY- MERS. (30) 6 Schopper, E. (Frankftst): HOLLOW TRACKS OF HEAVY IONS IN AgCl (Cd)-DETEC- TORS. CONTRIBUTION TO THE RADIAL PROFILE OF THE ACTION OF CHARGED PARTICLE IN SOLIDS. (30) 7 GroeneveH, K. a (Frankfurt): PARTICLE PENETRATION THROUGH FROZEN GASES. (15) 8 Ruaell, F. M. (Oxon), TRACK FORMATION BY RELEASE OF LATTICE ENERGY IN MICA. (15) 9 Nuclear Physics I (Chair: Perelygin, V. P. ) Brandt, R. (Marbwg), WIDE ANGLE EMISSION OF HEAVY FRAGMENTS IN RELA- TTVISTTC HEAVY ION COLLISIONS AND SOME OPEN PROB- LEMS. (30) 10 Cat, X. (WuiMw): DIGFTALCONTROLLED MEASUREMENT AND THREE-DI- MENSIONAL RECONSTRUCTION OF PARTICLE TRACKS IN EMULSION CHAMBER OF CERN/ EMUOl EXPERIMENT. (15) 11 Dwiveft, K. K. (ShllkM«): STUDIES OF THE FISSION OF HEAVY IONS AND EVAPORA- TION OF ALPHA PARTICLES USING NUCLEAR TRACK DE- TECTORS. (15) 12 Zhang, Huan-QUo, (Bdjtnf ), ANOMALOUS ANISOTROPIES OF FISSION FRAGMENTS IN NEAR- AND SUB-BARRIER FUSION-FISSION REACTIONS. (15) 13 Hie, R. (Ljubljana): ETCHED TRACK DETECTORS IN SOLAR NEUTRINO EXPER- IMENTS. (15) 14 * The number in the parentheses after the title shows the time in minute for which this paper will be presented orally, including discussions. The same implication is for the number after other titles. RT—Round Table oral presentation. ADVANCES IN SOLID STATE NUCLEAR TRACK DETECTORS P. B. Price Physics Department, University of California, Berkeley, CA 94720 New detectors made of phosphate glass, together with CR-39 and other poly mertic detectors, are being used in a rich variety of scientific applications, includ ing: 1. Most of the world' s knowledge about cluster radioactivity comes from ex porimcnts with phosphate glass and polyester detectors. Depending on the parent nu deus, the preferred type of cluster may be MC, 22O, 23F, 24Ne, 28Mg, 32Si, or 34Si. 2. CR- 39 and phosphate glass have been used to study fragmentation of beams of 16O, 28Si, 32S, and 197Au at Brookhaven and CERN at energies of 12 to 200 GeV/nucleon. When the target has a high atomic number such as Pb, the cross section for fragmentation due to the electromagnetic interaction can be larger than that due to the nuclear interaction. The process of charge pickup — the in crease in atomic number of the beam ion during an interaction — is found to occur with a cross section that increases as the square of the atomic number of the projec tile and is nearly independent of energy for energies above about 1 GeV/nucleon. Secondary nuclei produced in projectile fragmentation are found to disintegrate with unusually high cross sections. A search for strangelets — hypothetical compos- ite particles with very large strangeness and A/Z — is in progress. 3. Large arrays of phosphate glass have been flown in Antarctic balloon flights and on the Soviet Mir Space Station. New data now exist on the isotopic composition of Fe and Ni nuclei in cosmic rays, and tracks of nuclei up to uranium are being collected for analysis after the glass is recovered from space. 4. Measurements of the response of CR-39 to ions from deuterons up to iron over a wide range of velocities show that at velocities below 0. 01c the track etch rate deviates from a simple dependence on REL. 5. Using an Atomic Force Microscope, one sees that etching of tracks of ex- tremely low velocity ions in mica occurs by motion of steps one unit cell high. This powerful new observational tool may make it possible to distinguish recoil tracks of daughters of alpha decay from tracks due to recoil of atoms in the mica structure struck by neutral particles. An experiment is being set up to search in mica for re- coils due to Weakly Interacting Massive Particles (WIMPs) which might explain THEORY OF LATENT RADIATION DAMAGE IN POLYMERS LEWIS T. CHADDERTON1 and SALVADOR A. CRUZ2 Division of Applied Physics, CSIRO Institute of Industrial Technologies, and Laser Physics, Research School of Physical Sciences and Engineering, Institute for Advanced Studies, Australian National University, GPO Box 4, Canberra, ACT 2601, Australia. 2Dcpto. de Fisica, Universidad Autonoma Metropolitana-Iztapalapa, Apdo. Postal 55-534, 09340 Mexico DF. An atomistic model is developed which accounts for the rate of accumulation and fixation of ion-induced radiation damage in polymers as, for example, in the case of latent nuclear tracks. The theory specifically applies for incident ion energies E > Emax. where Em^ is that energy corresponding to the peak in the electronic stopping power Se for the particular ion/target combination. It is assumed that basic ionization processes create irreversible polymer damage by means of fundamental bond-breaking events along the particle trajectory, which totally dominate until the implanted ion comes to rest in a series of nuclear cascade events. Evolution of the accumulated damage pattern is calculated using an appropriate set of coupled rate equations for the moving species generated, which include consideration of isolated bond-breaking events, extended regions of damage, and their ultimate aggregation. HOLLOW TRACKS OF HEAVY IONS IN AgCl (Cd) -DETECTORS. Contribution to the radial profile of the action of charged particles in solids E.Schopper. Univ.of Frankfurtam Main Germany The microdensimetric lateral structure of tracks of charged particles in monocrystalline layers of AgCl-detectors, and in nuclear emulsion for comparison, has been measured by means of a videoelectronic computer-controlled
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