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THIRD SERIES, VOLUME 57, NUMBER 2 CONTENTS FEBRUARY 1998

RAPID COMMUNICATIONS

Emission of intermediate mass fragments using ␥-spectroscopic techniques ...... R457 J. Go´mez del Campo, C. Baktash, H.-Q. Jin, D. Rudolph, A. D’Onofrio, F. Terrasi, G. de Angelis, M. De Poli, C. Fahlander, A. Gadea, D. R. Napoli, Q. Pan, P. Spolaore, L. De Acuna, D. Bazzacco, S. Lunardi, P. Pavan, C. Rossi-Alvarez, A. Buscemi, R. Zanon, A. De Rosa, L. Campajola, M. La Commara, G. Inglima, V. Roca, M. Romano, M. Sandoli, M. Romoli, A. Ordine, and D. Pierroutsakou Examining the cooling of hot nuclei ...... R462 H. Xi, M. J. Huang, W. G. Lynch, S. J. Gaff, C. K. Gelbke, T. Glasmacher, G. J. Kunde, L. Martin, C. P. Montoya, S. Pratt, M. B. Tsang, W. A. Friedman, P. M. Milazzo, M. Azzano, G. V. Margagliotti, R. Rui, G. Vannini, N. Colonna, L. Celano, G. Tagliente, M. D’Agostino, M. Bruno, M. L. Fiandri, F. Gramegna, A. Ferrero, I. Iori, A. Moroni, F. Petruzzelli, and P. F. Mastinu ͑Miniball/Multics Collaboration͒ Particle production at high baryon density in central AuϩAu reactions at 11.6A GeV/c ...... R466 L. Ahle, Y. Akiba, K. Ashktorab, M. D. Baker, D. Beavis, H. C. Britt, J. Chang, C. Chasman, Z. Chen, C.-Y. Chi, Y. Y. Chu, V. Cianciolo, B. A. Cole, H. J. Crawford, J. B. Cumming, R. Debbe, J. C. Dunlop, W. Eldredge, J. Engelage, S.-Y. Fung, J. J. Gaardhoje, E. Garcia, M. Gonin, S. Gushue, H. Hamagaki, A. Hansen, L. Hansen, R. S. Hayano, G. Heintzelman, S. Homma, E. Judd, H. Kaneko, J. Kang, E.-J. Kim, A. Kumagai, K. Kurita, J.-H. Lee, M. J. Levine, J. Luke, Y. Miake, A. Mignerey, D. Morrison, B. Moskowitz, M. Moulson, C. Muentz, S. Nagamiya, M. N. Namboodiri, C. A. Ogilvie, J. Olness, S. Park, L. P. Remsberg, P. Rothschild, H. Sako, T. C. Sangster, R. Seto, J. Shea, K. Shigaki, R. Soltz, S. G. Steadman, G. S. F. Stephans, T. Sung, M. J. Tannenbaum, J. H. Thomas, S. Tonse, S. Ueno-Hayashi, F. Videbæk, F. Wang, Y. Wang, Y. Wu, H. Xiang, G. H. Xu, K. Yagi, D. Zachary, W. A. Zajc, F. Zhu, and Q. Zhu ͑E-802 Collaboration͒ Observation of a deformed band in 98Rh ...... R471 S. Chattopadhyay, A. Mukherjee, U. Datta Pramanik, A. Goswami, S. Bhattacharya, B. Dasmahapatra, S. Sen, H. C. Jain, and P. K. Joshi Three-particle breakup of the isobaric analog state in 17F ...... R475 J. C. Chow, A. C. Morton, R. E. Azuma, N. Bateman, R. N. Boyd, L. Buchmann, J. M. D’Auria, T. Davinson, M. Dombsky, W. Galster, E. Gete, U. Giesen, C. Iliadis, K. P. Jackson, J. D. King, G. Roy, T. Shoppa, and A. Shotter Hartree-Bose mean-field approximation for the interacting boson model ͑IBM-3͒ ...... R479 J. E. Garcı´a-Ramos, J. M. Arias, J. Dukelsky, E. Moya de Guerra, and P. Van Isacker

ARTICLES Nucleon-Nucleon Interaction, Few-Body Systems

yЈ Measurement and calculation of the polarization transfer parameter Ky in neutron-deuteron scattering at 15.0, 17.0, 19.0, and 25.8 MeV ...... 484 P. Hempen, P. Clotten, K. Hofenbitzer, T. Ko¨ble, W. Metschulat, M. Schwindt, W. von Witsch, L. Wa¨tzold, J. Weltz, W. Glo¨ckle, D. Hu¨ber, and H. Witała Nucleon-nucleon scattering observables from solitary boson exchange potential ...... 496 L. Ja¨de and H. V. von Geramb

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Proton-proton bremsstrahlung calculation: Studies of the off-shell proton electromagnetic vertex and of pseudoscalar vs pseudovector ␲N couplings ...... 507 Yi Li, M. K. Liou, and W. M. Schreiber Spin structure functions for three-nucleon systems: Neutrons and protons ...... 525 M. M. Yazdanpanah and M. Modarres Moscow-type NN potentials and three-nucleon bound states ...... 535 V. I. Kukulin, V. N. Pomerantsev, Amand Faessler, A. J. Buchmann, and E. M. Tursunov 3 Do phase-shift analyses and nucleon-nucleon potential models yield the wrong P j phase shifts at low energies? ...... 555 W. Tornow, H. Witała, and A. Kievsky Shell-model calculations for the three-nucleon system ...... 562 P. Navra´til and B. R. Barrett

Nuclear Structure

ϩ 168 164 Lifetimes of the lowest 2K␲ϭ0ϩ levels in Er and Dy ...... 569 H. Lehmann, J. Jolie, F. Corminboeuf, H. G. Bo¨rner, C. Doll, M. Jentschel, R. F. Casten, and N. V. Zamfir Two-phonon character of the lowest electric dipole excitation in 142Nd and in other nuclei near shell closures . . . 577 M. Wilhelm, S. Kasemann, G. Pascovici, E. Radermacher, P. von Brentano, and A. Zilges Measurements of the differences in the nuclear charge radii among uranium isotopes ...... 583 S. R. Elliott, P. Beiersdorfer, M. H. Chen, V. Decaux, and D. A. Knapp 99Tc produced by the ( 3He,pn␥) reaction ...... 590 Ben Crowe, Hurol Aslan, Tim Dague, D. G. Savage, Sadek Zeghib, F. A. Rickey, and P. C. Simms Excitation and decay of the Gamow-Teller giant resonance in 90Nb ...... 602 M. Moosburger, E. Aschenauer, H. Dennert, W. Eyrich, A. Lehmann, N. Scholz, H. Wirth, H. J. Gils, H. Rebel, and S. Zagromski Nuclear levels and structure from the decays of 213Bi and 209Tl ...... 612 G. Ardisson, V. Barci, and O. El Samad Magnetic moments of pre-yrast high spin and first-excited levels in neutron-deficient 162,163,164Hf isotopes ...... 621 L. Weissman, M. Hass, and C. Broude Proton decay of states in 11N ...... 628 A. Azhari, T. Baumann, J. A. Brown, M. Hellstro¨m, J. H. Kelley, R. A. Kryger, D. J. Millener, H. Madani, E. Ramakrishnan, D. E. Russ, T. Suomijarvi, M. Thoennessen, and S. Yokoyama Recoil distance lifetime measurements in 122,124Xe ...... 632 I. M. Govil, A. Kumar, H. Iyer, H. Li, U. Garg, S. S. Ghugre, T. Johnson, R. Kaczarowski, B. Kharraja, S. Naguleswaran, and J. C. Walpe Influence of dynamical Pauli effect and dynamical symmetry breaking on quantum chaos ...... 637 Ming-Tsung Lee, Wei-Min Zhang, and Cheng-Li Wu On-resonance deformation effect measurements: A probe of order within chaos in the nucleus ...... 648 E. D. Davis and C. R. Gould Quantum molecular dynamics approach to the nuclear matter below the saturation density ...... 655 Toshiki Maruyama, Koji Niita, Kazuhiro Oyamatsu, Tomoyuki Maruyama, Satoshi Chiba, and Akira Iwamoto N-phonon giant resonances in the nonlinear hydrodynamic approach and the nucleon-nucleon interaction ...... 666 V. Yu. Denisov Interacting boson model plus broken-pair description of high-spin dipole bands ...... 675 D. Vretenar, S. Brant, G. Bonsignori, L. Corradini, and C. M. Petrache Nuclear structure of 97Y in the interacting boson fermion plus broken pair model and the nature of the 3.523 MeV high-spin isomer ...... 681 G. Lhersonneau, S. Brant, V. Paar, and D. Vretenar

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Boson mappings and four-particle correlations in algebraic neutron-proton pairing models ...... 688 J. Dobesˇ and S. Pittel Hyperonic nuclear matter in Brueckner theory ...... 704 H.-J. Schulze, M. Baldo, U. Lombardo, J. Cugnon, and A. Lejeune Lowest order constrained variational calculation for asymmetrical nuclear matter with the new Argonne potential ...... 714 G. H. Bordbar and M. Modarres

Nuclear Reactions Transfer and surface vibration couplings in the fusion of 40Caϩ46,48,50Ti at near-barrier energies ...... 722 A. A. Sonzogni, J. D. Bierman, M. P. Kelly, J. P. Lestone, J. F. Liang, and R. Vandenbosch Fusion and binary-decay mechanisms in the 35Clϩ 24Mg system at E/AϷ8 MeV ...... 731 Sl. Cavallaro, E. De Filippo, G. Lanzano`, A. Pagano, M. L. Sperduto, R. Dayras, R. Legrain, E. Pollacco, C. Beck, B. Djerroud, R. M. Freeman, F. Haas, A. Hachem, B. Heusch, D. Mahboub, A. Morsad, R. Nouicer, and S. J. Sanders Complete and incomplete fusion reactions in 12Cϩ89Y: Excitation functions and recoil range measurements ..... 743 B. Bindu Kumar, S. Mukherjee, S. Chakrabarty, B. S. Tomar, A. Goswami, and S. B. Manohar Sequential reaction processes in the 12Cϩ12C system at an energy of 28.7 MeV/nucleon ...... 749 A. Magiera, J. Hebenstreit, L. Jarczyk, B. Kamys, A. Strzałkowski, B. Styczen´, W. Oelert, P. von Rossen, and H. Seyfarth Multifragmentation of the remnant produced in the reaction of 1A GeV gold with carbon ...... 764 J. A. Hauger, P. Warren, S. Albergo, F. Bieser, F. P. Brady, Z. Caccia, D. A. Cebra, A. D. Chacon, J. L. Chance, Y. Choi, S. Costa, J. B. Elliott, M. L. Gilkes, A. S. Hirsch, E. L. Hjort, A. Insolia, M. Justice, D. Keane, J. C. Kintner, V. Lindenstruth, M. A. Lisa, H. S. Matis, M. McMahan, C. McParland, W. F. J. Mu¨ller, D. L. Olson, M. D. Partlan, N. T. Porile, R. Potenza, G. Rai, J. Rasmussen, H. G. Ritter, J. Romanski, J. L. Romero, G. V. Russo, H. Sann, R. P. Scharenberg, A. Scott, Y. Shao, B. K. Srivastava, T. J. M. Symons, M. Tincknell, C. Tuve´, S. Wang, H. H. Wieman, T. Wienold, and K. Wolf ͑EOS Collaboration͒ Low-energy pion-nucleon scattering ...... 784 W. R. Gibbs, Li Ai, and W. B. Kaufmann Giant resonances as collective states with dissipative coupling ...... 798 E. Stefanescu, R. J. Liotta, and A. Sandulescu Elastic nucleon-nucleon cross section in nuclear matter at finite temperature ...... 806 A. Schnell, G. Ro¨pke, U. Lombardo, and H.-J. Schulze Comparison of clustering effects in 12C fragmentation among pϩ12C, ␣ϩ12C, and 14Nϩ12C reactions: Excitation of ␣-cluster degrees of freedom in nuclear collisions ...... 811 Hiroki Takemoto, Hisashi Horiuchi, and Akira Ono Randomly broken nuclei and disordered systems ...... 822 K. C. Chase, P. Bhattacharyya, and A. Z. Mekjian Caloric curve and conditional moments: Effects of secondary fragment decay ...... 831 P. F. Mastinu, M. Belkacem, F. Gramegna, and P. M. Milazzo

Relativistic/ Ultrarelativistic Nuclear Collisions Proton and antiproton distributions at midrapidity in proton-nucleus and sulphur-nucleus collisions ...... 837 I. G. Bearden, H. Bo”ggild, J. Boissevain, J. Dodd, S. Esumi, C. W. Fabjan, D. E. Fields, A. Franz, A. G. Hansen, E. B. Holzer, T. J. Humanic, B. V. Jacak, R. Jayanti, H. Kalechofsky, Y. Y. Lee, M. Leltchouk, B. Lo¨rstad, N. Maeda, A. Medvedev, A. Miyabayashi, M. Murray, S. Nishimura, S. U. Pandey, F. Piuz, V. Polychronakos, M. Potekhin, G. Poulard, A. Sakaguchi, M. Sarabura, M. Spegel, J. Simon-Gillo, W. Sondheim, T. Sugitate, J. P. Sullivan, Y. Sumi, H. van Hecke, W. J. Willis, K. Wolf, and N. Xu ͑The NA44 Collaboration͒

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Transverse and forward energy distributions in ultrarelativistic heavy-ion collisions by an absorption model ..... 847 K. C. Chung, C. S. Wang, A. J. Santiago, and G. Pech Dimensional effects in a relativistic mean-field approach ...... 857 A. Delfino, Lizardo H. C. M. Nunes, and J. S. Sa´ Martins Constraining a simple hadronization model of relativistic heavy-ion collisions using hadronic observables ...... 866 T. J. Humanic Effects of multipion correlations on the source distribution in ultrarelativistic heavy-ion collisions ...... 877 Q. H. Zhang Low-mass dileptons at 200 GeV/nucleon ...... 882 J. Murray, W. Bauer, and K. Haglin Propagation of charm quarks in equilibrating quark-gluon plasma ...... 889 Munshi Golam Mustafa, Dipali Pal, and Dinesh Kumar Srivastava Energy loss effects on charm and bottom production in high-energy heavy-ion collisions ...... 899 Ziwei Lin, Ramona Vogt, and Xin-Nian Wang Phase transition of a finite quark-gluon plasma ...... 908 C. Spieles, H. Sto¨cker, and C. Greiner Probing the ␳ spectral function in hot and dense nuclear matter by dileptons ...... 916 W. Cassing, E. L. Bratkovskaya, R. Rapp, and J. Wambach Role of isospin dependent mean field in pion production in heavy ion reactions ...... 922 V. S. Uma Maheswari, C. Fuchs, Amand Faessler, Z. S. Wang, and D. S. Kosov

Subnucleon Aspects of Nuclei/Physics of Hadrons Vector mesons in the nuclear medium with a finite three-momentum ...... 927 Su Houng Lee ␲␲ scattering amplitudes in the subthreshold region ...... 931 Gerald E. Hite and William. B. Kaufmann Structure analysis of the virtual Compton scattering amplitude at low energies ...... 941 D. Drechsel, G. Kno¨chlein, A. Yu. Korchin, A. Metz, and S. Scherer String mechanism for the leading charm effect ...... 953 C. E. Aguiar, T. Kodama, R. A. M. S. Nazareth, and G. Pech

Nuclear Astrophysics Measurement of the 8Li͑n,␥) 9Li cross section at astrophysical energies by reverse kinematics ...... 959 P. D. Zecher, A. Galonsky, S. J. Gaff, J. J. Kruse, G. Kunde, E. Tryggestad, J. Wang, R. E. Warner, D. J. Morrissey, K. Ieki, Y. Iwata, F. Dea´k, A´ . Horva´th, A´ . Kiss, Z. Seres, J. J. Kolata, J. von Schwarzenberg, and H. Schelin

BRIEF REPORTS Systematics of yrast levels in odd Ru isotopes: Do they point to coexistence at low excitation? ...... 967 T. Borello-Lewin, J. L. M. Duarte, L. B. Horodynski-Matsushigue, and M. D. L. Barbosa Fission fragment angular distributions at near-barrier energies in 11B, 12C, 14Nϩ209Bi ...... 971 G. V. Ravi Prasad, A. M. Samant, A. Shrivastava, A. Navin, A. Chatterjee, P. Singh, S. Kailas, and V. S. Ramamurthy 10 Thomas-Ehrman effect on s1/2 and p1/2 resonance states in Cϩp ...... 975 S. Aoyama, N. Itagaki, K. Kato¯, and K. Ikeda Master equation approach to statistical multistep compound reactions ...... 978 Toshihiko Kawano, Masahiro Nakamura, and Yukinobu Watanabe Optical model methods of predicting nuclide production from spallation reactions ...... 982 C. R. Ramsey, L. W. Townsend, R. K. Tripathi, and F. A. Cucinotta

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Probing monopole double giant resonances by dilepton (E0) emission ...... 986 D. S. Delion, R. J. Liotta, N. Sandulescu, and T. Vertse Local electric dipole strength in heavy nuclei ...... 990 A. M. Oros, K. Heyde, C. De Coster, and B. Decroix Gamow-Teller decay of Nϭ51 nuclei ...... 994 I. P. Johnstone Unresolved dipole strength in spectra of the 157Gd(␥,␥Ј) reaction ...... 996 J. Enders, N. Huxel, U. Kneissl, P. von Neumann-Cosel, H. H. Pitz, and A. Richter ␣-nucleus scattering in angular momentum space ...... 1000 I. Jamir, E. F. P. Lyngdoh, and C. S. Shastry

Errata Erratum: ␲N ␩N and ␩N ␩N partial-wave T matrices in a coupled, three-channel model ͓Phys. Rev. C→51, 2310 ͑1995→͔͒ ...... 1004 M. Batinic´,I.Sˇlaus, A. Sˇvarc, and B. M. K. Nefkens Erratum: Verification of isomerism and direct measurement of half-lives in 184Au ͓Phys. Rev. C 55, 2697 ͑1997͔͒ ...... 1006 K. Zaerpoor, Y. Xu, M. Gummin, K. S. Krane, J. L. Wood, N. J. Stone, and J. Rikovska Erratum: Dipole excitations in the transitional nucleus 144Nd studied in photon scattering experiments ͓Phys. Rev. C 56, 1256 ͑1997͔͒ ...... 1007 T. Eckert, O. Beck, J. Besserer, P. von Brentano, R. Fischer, R.-D. Herzberg, U. Kneissl, J. Margraf, H. Maser, A. Nord, N. Pietralla, H. H. Pitz, S. W. Yates, and A. Zilges

Selected Abstracts from Physical Review D ...... 1008 Cumulative Author Index ...... 1012