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1. Hadron production in nuclear collisions from the NA49 experiment at 158GeV/c · A

Author

J. W. Harris, M. Ivanov, V. Eckardt, H. G. Fischer, Lawrence Pinsky, Christoph Blume, E. Schäfer, A. Yu. Semenov, P. Seyboth, H. Sann, Andrzej Rybicki, Siegfried Wenig, C. O. Blyth, Branislav Sitar, Lee Stuart Barnby, R. Ganz, Rene Brun, Panagiota Foka, S. Voloshin, Gyorgy Vesztergombi, Miroslav Pikna, B. W. Mayes, D. Ferenc, E. Skrzypczak, A. M. Poskanzer, Ferenc Sikler, I. K. Yoo, Tatjana Susa, A. Sandoval, H. G. Ritter, Fuqiang Wang, M. Toy, Jeffrey G. Reid, Alexander Malakhov, Gunther Roland, S. Hegyi, Peter Levai, J. Bartke, P. Freund, Christina Markert, R.J.M. Snellings, J. G. Cramer, D. Cebra, Nu Xu, Juraj Bracinik, S. Trentalange, Dezső Varga, Marek Gaździcki, H. Ströbele, Imrich Szarka, Andreas Petridis, Apostolos Panagiotou, J. Gál, J. Bächler, Peter Martin Jacobs, D. Barna, D. D. Weerasundara, R. Janik, P. Csato, M. Vassiliou, G. L. Melkumov, V. Friese, J. Grebieszkow, G. Odyniec, V. Hlinka, R. Stock, B. Boimska, V. I. Kolesnikov, Predrag Buncic, R. A. Barton, C. A. Whitten, R. Lednicky, Helena Bialkowska, C. Höhne, G. Pálla, S. Margetis, J. Ftacnik, T. A. Yates, D. Vranic, A. Billmeier, C. P. A. Roland, Thomas A. Trainor, T. Ullrich, F. Pühlhofer, I. Szentpetery, F. P. Brady, Gabor Istvan Veres, Norbert Schmitz, J. M. Nelson, J. Zimányi, W. Retyk, J. Sziklai, Peter Graham Jones, D. J. Prindle, Marek Kowalski, T. Sammer, B. Lasiuk, Z. Fodor, E. Gladysz, L. Betev, R. Renfordt, Lincoln D. Carr, G.E. Cooper, Peter Strmen, Jozsef Molnar, G.T.A. Squier, K. Kadija, Dieter Røhrich, F. Eckhardt, G. Igo, and M. Oldenburg

Subjects
Quantum chromodynamics, Nuclear reaction, Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Particle identification, Nuclear physics, Strange matter, High Energy Physics::Experiment, Impact parameter, Nuclear Experiment, NA49 experiment
Abstract

With its large acceptance and particle identification coverage the NA49 experiment (Fig. 1) can study hadron production in a wide range of high energy reactions [1]. Originally aimed at examining central Pb+Pb collisions for signatures of quark-gluon plasma formation, the scope of the experiment has been enhanced with a systematic study of impact parameter and projectile size dependence, as well as the inclusion of the more elementary p+p and p+A interactions. The question is: are predicted signals of the quark-gluon plasma observed and are there discontinuities which would support the concept of hadronic phase transition?

Published
1999
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2. F emission in central Pb+Pb collisions at 158 GeV/u

Author

J. Gál, F. Pühlhofer, J. Dunn, Christina Markert, J. M. Nelson, Siegfried Wenig, Andreas Petridis, P. Csato, R. Stock, C. Bormann, Fuqiang Wang, D. D. Weerasundara, R. J. Porter, F. P. Brady, R. A. Barton, D. Schmischke, H. L. Caines, S. Margetis, S. Trentalange, D. J. Prindle, Peter Martin Jacobs, C. A. Whitten, R. Brockmann, V. Friese, E. Schäfer, A. Yu. Semenov, Predrag Buncic, Lee Stuart Barnby, Christof Roland, A. Piper, Marek Kowalski, Rainer Arno Ernst Renfordt, I. Huang, L. Wood, C. O. Blyth, Panagiota Foka, P. Szymanski, T. Ullrich, L. A. Hill, Helena Bialkowska, Jeffrey G. Reid, A. Mock, H. G. Fischer, J. Seyerlein, T. Wienold, F. Gabler, S. Schönfelder, S. Poziombka, Gyorgy Vesztergombi, F. Eckhardt, B. Lasiuk, A. M. Poskanzer, E. Gladysz, E. Skrzypczak, Torsten Henkel, X.-Z. Zhu, D. Flierl, H. Appelshäuser, Ferenc Sikler, N. Schmitz, Gunther Roland, Dieter Røhrich, Falk Pühlhofer, R. Zybert, G. Odyniec, G. Igo, M. Oldenburg, J. Zimányi, Z. Fodor, P. Freund, Jozsef Molnar, G.T.A. Squier, H. Hümmler, Thomas A. Trainor, J. Bächler, J. W. Harris, M. Vassiliou, Peter Graham Jones, G.E. Cooper, M. I. Ferguson, J. Sziklai, A. Billmeier, G. Pálla, W. Retyk, P. Seyboth, S. J. Bailey, D. Cebra, J. Günther, Apostolos Panagiotou, G. L. Melkumov, Kreso Kadija, V. Eckardt, Alexander Malakhov, Andrzej Rybicki, Rene Brun, A. Sandoval, S. Hegyi, M. Fuchs, J. G. Cramer, Marek Gaździcki, V. I. Kolesnikov, T. A. Yates, D. Vranic, H. Rudolph, I. Szentpetery, W. Rauch, M. Toy, J. Grebieszkow, H. Sann, J. Bartke, H. Ströbele, R. K. Bock, H. G. Ritter, Peter Levai, and D. Irmscher

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Large Hadron Collider, Yield (chemistry), Strangeness, Square (algebra), NA49 experiment
Abstract

Data on φ -production obtained by the CERN NA49 experiment for central Pb+Pb collisions at 158 GeV/u are presented. Compared with pp interactions the φ -yield shows substantial strangeness enhancement: the φ /π ratio is found to increase by a factor of 2.6 ± 0.6, which is approximately the square of the K/π enhancement.

Published
1998
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3. Directed and elliptic flow in 158 GeV/nucleon Pb + Pb collisions

Author

J. W. Harris, Jozsef Molnar, F. P. Brady, V. Eckardt, K. Kadija, D. Flierl, D. D. Weerasundara, G.T.A. Squier, M. I. Ferguson, A. Sandoval, D. Irmscher, Siegfried Wenig, D. Schmischke, C. O. Blyth, S. Hegyi, M. Fuchs, C. Bormann, R. J. Porter, S. Margetis, H. G. Fischer, Andrzej Rybicki, H. Appelshäuser, R. A. Barton, J. G. Cramer, S. Schönfelder, Gyorgy Vesztergombi, Helena Bialkowska, D. J. Prindle, Dieter Røhrich, Rene Brun, H. G. Ritter, Marek Gaździcki, Christof Roland, A. Piper, T. Wienold, R. Zybert, S. Voloshin, G.E. Cooper, Rainer Arno Ernst Renfordt, E. Skrzypczak, Marek Kowalski, G. Pálla, Peter Levai, M. Toy, Andreas Petridis, I. Huang, L. Wood, Panagiota Foka, E. Gladysz, F. Eckhardt, P. Freund, J. Sziklai, Ferenc Sikler, F. Pühlhofer, G. L. Melkumov, G. Odyniec, J. Grebieszkow, J. Bächler, M. Vassiliou, V. I. Kolesnikov, G. Igo, M. Oldenburg, E. Schäfer, J. M. Nelson, A. Yu. Semenov, R. Brockmann, P. Csato, R. Stock, J. Seyerlein, Norbert Schmitz, Peter Martin Jacobs, T. A. Yates, D. Vranic, Predrag Buncic, Gunther Roland, P. Seyboth, F. Gabler, H. Rudolph, T. Ullrich, I. Szentpetery, Alexander Malakhov, L. A. Hill, D. Cebra, J. Günther, Peter Graham Jones, S. Trentalange, Apostolos Panagiotou, C. A. Whitten, J. Dunn, Christina Markert, V. Friese, Thomas A. Trainor, S. Poziombka, J. Zimányi, A. Mock, Torsten Henkel, B. Lasiuk, Z. Fodor, H. Hümmler, Jeffrey G. Reid, W. Retyk, W. Rauch, H. Sann, J. Bartke, J. Gál, H. Ströbele, R. K. Bock, Fuqiang Wang, A. M. Poskanzer, Lee Stuart Barnby, H. Caines, and S. J. Bailey

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, Elliptic flow, Physics::Fluid Dynamics, Nuclear physics, Pion, Flow (mathematics), Transverse momentum, Rapidity, Nuclear Experiment, Nucleon, Beam (structure)
Abstract

The directed and elliptic flow of protons and charged pions has been observed from the semi-central collisions of a 158 GeV/nucleon Pb beam with a Pb target. The rapidity and transverse momentum dependence of the flow has been measured. The directed flow of the pions is opposite to that of the protons at high rapidity but both exhibit negative flow at low p t . The elliptic flow of both is fairly independent of rapidity but rises with p t .

Published
1998
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4. Collective flow and particle spectra in relativistic heavy ion collisions

Author

Yufeng Zhang, James Alexander, H. G. Ritter, M. Heffner, M. L. Gilkes, D. Keane, P. Chung, Y. M. Liu, Lei Huo, C. Pinkenburg, J. Whitfield, N. N. Ajitanand, G. Rai, A. C. Das, F. P. Brady, S. Wang, H. Liu, Roy A. Lacey, D. Best, Z. Milosevich, David Krofcheck, T. Wienold, Morton Kaplan, J. L. Romero, E. Hjort, T. Case, R. P. Scharenberg, Xiaodong Yang, A. S. Hirsch, L. Wood, Kenneth M. Crowe, J. L. Chance, D. Cebra, M. A. Lisa, Brian Cole, G. Odyniec, S. Gushue, W. N. Zhang, M. Justice, D. L. Olson, W. Caskey, J. E. Draper, B. K. Srivastava, N. T. B. Stone, N. T. Porile, R. L. McGrath, L. S. Schroeder, and T. J. M. Symons

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Time projection chamber, Proton, Solid angle, Observable, Rapidity, Atomic physics, Nuclear Experiment, Tracking (particle physics), Spectral line, Particle identification
Abstract

The E895 experiment has undertaken a systematic and exclusive study of Au+Au collisions between 2–8 A GeV. Complete event-by-event data were obtained using the EOS time projection chamber (TPC) which provided good particle identification and continuous tracking over almost 4π solid angle. In central Au+Au collisions at 6 A GeV, the proton rapidity distribution indicates almost complete stopping, hence high baryon density. We present preliminary results on collective flow observables as a function of beam energy. Data are compared with theoretical predictions.

Published
1998
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5. Hadron yields and hadron spectra from the NA49 experiment

Author

D. D. Weerasundara, C. Bormann, J. Bächler, D. Schmischke, M. Vassiliou, P. Seyboth, D. Irmscher, Rainer Arno Ernst Renfordt, A. Piper, H. G. Fischer, Ferenc Sikler, C. O. Blyth, Siegfried Wenig, J. Sziklai, Kreso Kadija, F. Pühlhofer, G.E. Cooper, H. G. Ritter, Peter Levai, J. Gál, D. Cebra, J. Günther, J. W. Harris, J. M. Nelson, M. Toy, Apostolos Panagiotou, G. L. Melkumov, I. Huang, L. Wood, J. Grebieszkow, S. Schönfelder, V. Eckardt, P. B. Cramer, X.-Z. Zhu, G. Odyniec, J. G. Cramer, Gyorgy Vesztergombi, Andreas Petridis, F. P. Brady, P. Freund, Lee Stuart Barnby, M. Cyprian, Peter Graham Jones, Marek Gaździcki, N. Bunicic, J. W. Mitchell, Christof Roland, A. M. Poskanzer, H. Appelshäuser, Jozsef Molnar, R. Bock, M. I. Ferguson, Helena Bialkowska, S. Margetis, T. Wienold, E. Skrzypczak, S. Poziombka, R. Zybert, S. Trentalange, J. Zimányi, R. Brockmann, V. I. Kolesnikov, T. A. Yates, D. Vranic, D. J. Prindle, H. Rudolph, D. Flierl, Peter Martin Jacobs, Marek Kowalski, I. Szentpetery, Predrag Buncic, S. Euler, E. Gladysz, A. Mock, Z. Fodor, H. Hümmler, G. Pálla, Andrzej Rybicki, E. Schäfer, A. Yu. Semenov, A. Sandoval, J. Seyerlein, H. L. Caines, S. Hegyi, M. Fuchs, W. Retyk, Alexander Malakhov, P. Csato, R. Stock, F. Gabler, B. Lasiuk, I. Derado, Panagiota Foka, O. Dietz, L. A. Hill, Thomas A. Trainor, P. Chan, H. Sann, J. Dunn, Christina Markert, S. Afanasiev, F. Eckhardt, J. Bartke, G. Igo, H. Ströbele, W. Rauch, N. Schmitz, Dieter Røhrich, Gunther Roland, M. A. Howe, C. A. Whitten, and T. Alber

Subjects
Physics, Nuclear physics, S system, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, Hadron, Nuclear Experiment, Nucleon, Central region, NA49 experiment, Spectral line
Abstract

Preliminary inclusive spectra of negative hadrons, net protons and neutral strange particles are presented, measured by the NA49 experiment in central Pb+Pb collisions at 158 GeV per nucleon. Comparison of their yields with those from the lighter S+S system suggests that the yields scale approximately with the number of participating nucleons.

Published
1996
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6. Stopping and collective effects at SPS energies

Author

J. Dunn, Christina Markert, Siegfried Wenig, M. A. Howe, S. Poziombka, Serguei Afanasiev, F. Pühlhofer, J. Zimányi, J. G. Cramer, J. Sziklai, C. A. Whitten, C. O. Blyth, M. I. Ferguson, J. M. Nelson, A. M. Poskanzer, T. Alber, Lee Stuart Barnby, F. P. Brady, W. Rauch, S. Schönfelder, Gyorgy Vesztergombi, Andreas Petridis, D. Prindle, Norbert Schmitz, L. A. Hill, C. Bormann, Helena Bialkowska, G. L. Melkumov, M. Vassiliou, Marek Kowalski, R. Zybert, S. Margetis, Peter Martin Jacobs, H. Sann, Marek Gaździcki, R. Brockmann, E. Gladysz, Predrag Buncic, Peter Graham Jones, G. Odyniec, E. Schäfer, Jozsef Molnar, D. Irmscher, R. Bock, J. W. Mitchell, P. Seyboth, A. Yu. Semenov, S. Euler, J. Bartke, M. Toy, T. A. Yates, D. Vranic, F. Eckhardt, M. Cyprian, Gunther Roland, J. Grebieszkow, Christof Roland, P. Chan, J. W. Harris, H. Rudolph, H. G. Ritter, E. Skrzypczak, P. B. Cramer, N. Buncic, Rainer Arno Ernst Renfordt, J. Seyerlein, Peter Levai, A. Piper, H. Ströbele, G. Igo, J. Gál, D. Cebra, J. Günther, V. Eckardt, S. Trentalange, Apostolos Panagiotou, T. A. Trainor, I. Szentpetery, I. Huang, Ferenc Sikler, P. Freund, L. Wood, D. D. Weerasundara, D. Schmischke, D. Flierl, H. G. Fischer, Dieter Røhrich, H. Appelshäuser, G.E. Cooper, G. Pálla, X. Z. Zhu, K. Kadija, A. Sandoval, S. Hegyi, M. Fuchs, J. Bächler, V. I. Kolesnikov, H. L. Caines, Andrzej Rybicki, T. Wienold, P. Csato, R. Stock, Panagiota Foka, O. Dietz, F. Gabler, B. Lasiuk, I. Derado, A. Mock, Z. Fodor, H. Hümmler, W. Retyk, and Alexander Malakhov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, Spectrometer, Nuclear Theory, Collision, Projection (linear algebra), Nuclear physics, Time of flight, Energy flow, Rapidity, Nuclear Experiment, Nucleon
Abstract

We discuss preliminary data on stopping for central Pb + Pb collisions at 158 GeV/nucleon. The (net) proton rapidity density measured by the NA49 Time Projection Chambers, NA49 Time of Flight and the NA44 spectrometer is presented. Slightly higher stopping is observed relative to S + S at 200 GeV/nucleon. The rapidity density exhibits a plateau around mid-rapidity which is qualitatively different from results at the AGS and BEVALAC/SIS energies. The second part of the paper discusses the azimuthal correlation of the energy flow. Preliminary results reveal that the ‘fireball’ preserves the information of the collision geometry even at SPS energies.

Published
1996
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7. The 54,56Fe(n, p)54,56Mn reactions at En = 97 MeV

Author

Nils Olsson, F. P. Brady, W. Unkelbach, A. Ringbom, H. Condé, P-U Renberg, Ane Håkansson, O. Jonsson, Leif Nilsson, R. Zorro, E. Ramström, T. Rönnqvist, S.Y. van der Werf, Gunnar Tibell, and Jan Blomgren

Subjects
Nuclear physics, Nuclear reaction, Physics, Nuclear and High Energy Physics, Supernova, Isotope, Scattering, Electron capture, Nuclear Theory, Atomic physics, Born approximation, Spectral line, Excitation
Abstract

Double-differential cross sections of the 54,56Fe(n, p) reactions have been measured at 97 MeV in the angular range 0–30° for excitation energies up to 40 MeV. The spectra have been decomposed into different multipolarities by a technique based on the use of sample angular distributions calculated within the distorted-wave Born approximation. From the identified Gamow-Teller strength, Sβ+ values were obtained for 54Fe and 56Fe. Comparisons with available shell-model calculations of the GT strength were made. The results are important for models of supernova explosions since electron-capture rates, which are proportional to Sβ+, in 1f2p-shell nuclei affect the dynamics of the star. At higher excitation energies, the spectra are dominated by L = 1 strength in broad distributions with a maximum at about 12 MeV. Microscopic calculations based on the random-phase approximation were performed and compared with the experimental data.

Published
1993
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8. analyzing powers and differential cross sections at 32, 40, 50 and 52.5 MeV

Author

B.E. Bonner, A.L. Sagle, N.S.P. King, J. L. Romero, and F. P. Brady

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Proton, Cyclotron, Function (mathematics), law.invention, Nuclear physics, Cross section (physics), law, Atomic physics, Legendre polynomials, Beam (structure), Differential (mathematics)
Abstract

Measurements of the analyzing powers and differential cross sections for the 4He( p , d)3He reaction at 32, 40, 50 and 52.5 MeV have been carried out using a polarized proton beam from the 88 inch cyclotron at LBL. Legendre polynomial fits of the cross section and differential analyzing power (σA) as a function of energy have smoothly varying coefficients.

Published
1991
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9. Differential cross sections for np and nd elastic scattering near 130 MeV

Author

J.A. Edgington, V.J. Howard, F. P. Brady, I.M. Blair, S.S. das Gupta, N.M. Stewart, M.W. McNaughton, and B. E. Bonner

Subjects
Nuclear reaction, Physics, Elastic scattering, Nuclear and High Energy Physics, Broad spectrum, Deuterium, Partial wave analysis, Nuclear Theory, Neutron, Atomic physics, Neutron radiation, Nuclear Experiment, Charged particle
Abstract

We have measured the np (nd) elastic scattering cross sections at 25(17) angles in the interval 30°–168° (c.m.), using a neutron beam with a broad spectrum peaked near 130 MeV. At backward angles the outgoing charged particles from a liquid hydrogen (deuterium) target were detected; at forward angles we detected neutrons scattered from a hydrogenated (deuterated) scintillating target. Cross sections have been normalized to the energy dependent solution of the Livermore nucleon-nucleon partial wave analysis, evaluated at 130 MeV. The np measurements represent a marginal improvement on previous work; the nd cross sections show some differences from pd measurements, in agreement with earlier indications at an energy of 152 MeV.

Published
1974
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10. A measurement of neutron-proton bremsstrahlung near 130 MeV

Author

M.W. McNaughton, I.M. Blair, F. P. Brady, B. E. Bonner, V.J. Howard, and J.A. Edgington

Subjects
Scattering cross-section, Nuclear reaction, Physics, Nuclear and High Energy Physics, Proton, Nuclear Theory, Bremsstrahlung, Nuclear physics, Nuclear cross section, Neutron, Atomic physics, Nuclear Experiment, Nucleon, Data reduction
Abstract

We have measured the double differential cross section for bremsstrahlung production in neutron-proton collisions near 130 MeV. Outgoing nucleons were detected at eight pairs of angles simultaneously. The cross sections agree with several theoretical predictions for those four angle pairs in which the proton emerged at 20° ( θ = 20°), but are larger than expected in the four cases that θ p = 32°. The method of data reduction, and the sources of uncertainty, are discussed in detail.

Published
1974
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11. Proton pickup from 27Al via the (n, d) reaction at 56.3 MeV

Author

F. P. Brady, J.R. Shepard, J.C. Wang, N.S.P. King, and M.W. McNaüghton

Subjects
Rotational model, Physics, Nuclear and High Energy Physics, Proton, Deuterium, Yield (chemistry), Nuclear Theory, SHELL model, Pickup, Neutron, Atomic physics, Nuclear Experiment, Spectral line
Abstract

Energy spectra of deuterons from the 27 Al(n, d) 26 Mg reaction due to 56.3 MeV neutrons incident have been measured for 10° ≦ θ c.m. ≦ 55°. The angular distributions for the excitations observed at 0.0, 1.81, and 4.33 MeV are quite well described by DWBA calculations and yield spectroscopic factors in agreement with shell model calculations; but with calculations based on the rotational model, the agreement is less satisfactory particularly for the 4.33 MeV level. For the states at 7.86 and 9.16 MeV the fits, assuming p-shell pick-up, are only fair. Comparison with 27 Al(d, 3 He) 26 Mg measurements shows that the deduced spectroscopic factors for the two reactions agree quite well.

Published
1977
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12. Analog giant dipole excitation in Si(n, p) at 59.6 MeV

Author

D. H. Fitzgerald, J. L. Romero, C.M. Castaneda, F. P. Brady, G.A. Needham, Nicholas S. P. King, and J. L. Ullmann

Subjects
Cross section (geometry), Physics, Nuclear and High Energy Physics, Dipole, Giant resonance, Excited state, Continuum (design consultancy), Resonance, Sum rule in quantum mechanics, Atomic physics, Dipole excitation
Abstract

The parent analog of the giant dipole resonance in 28 Si is studied by means of the (n, p) reaction. The continuum contribution to the giant dipole region was estimated by a phenomenological parameterization. The observed cross section exhausts 31% of the SJ sum rule; 88% of the GT sum rule or 67% of the Myers-Swiatecki prediction. A comparison is made to the giant resonance region observed in the 28 Si(p, p') reaction which was recently used, via comparison to 28 Si(α, α'), to infer that the GDR in 28 Si is not excited or at least not seen in (p, p').

Published
1982
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13. Excitation of analog isovector giant resonances via the (n, p) reaction on 14N and 16O at 60MeV

Author

J. W. Watson, J. L. Ullmann, F. P. Brady, G.A. Needham, Nicholas S. P. King, J. L. Romero, D. H. Fitzgerald, G.R. Satchler, and C.I. Zanelli

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Dipole, Isovector, Proton, Nuclear Theory, Resonance, Born approximation, Atomic physics, Nuclear Experiment, Excitation, (n-p) reaction
Abstract

Data were accumulated for the (n, p) reaction on 14N and 16O using 60MeV neutrons. Angular distributions of the cross sections for eight proton groups were extracted and compared to distorted-waves Born approximation (DWBA) calculations using a simple macroscopic model. Enhancements in the spectra were seen in each case in the region of excitation corresponding to the giant dipole resonance (GDR) of the target nucleus. DWBA calculations show that these excitations are primarily dipole and favor the use of the Goldhaber-Teller form factor. Comparison with photo-absorption measurements suggests that there may also be significant contributions to the (n, p) reaction from “spin-flip” dipole excitations. The other proton groups could be correlated with the results of other experiments and include excitations of analogs of the giant isovector “magnetic” dipole mode of 14N.

Published
1982
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14. Elastic scattering of 7–9 MeV protons by 89Y

Author

F. P. Brady, J. E. Draper, and J.A. McCray

Subjects
Nuclear physics, Nuclear reaction, Physics, Elastic scattering, Nuclear and High Energy Physics, Proton, Nuclear cross section, Atomic physics, Inelastic scattering, Nuclear Experiment, Polarization (waves), Small-angle neutron scattering
Abstract

Measurement and analysis of proton elastic scattering on 89 Y are reported for lab energies of 7.44, 8.08 and 9.01 MeV. The results were analysed with the optical model using the average parameters of Rosen employed for analysis of proton elastic scattering, polarization and reaction cross sections for many nucleides. The fit is satisfactory but is improved by a 2–3 MeV (4–6%) increase of the real central potential and a 1–2 MeV decrease in the imaginary potential. The potential parameters from a best-fit search are also listed.

Published
1967
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15. Elastic alpha-particle scattering at 8.75, 9.35 and 10.15 MeV

Author

J. C. Young, J.A. Jungerman, and F. P. Brady

Subjects
Physics, Elastic scattering, Nuclear reaction, Nuclear and High Energy Physics, Scattering, Oscillation, Carbon-12, Alpha particle, Radius, Atomic physics, Oxygen-16
Abstract

The angular distributions of elastically scattered alpha particles have been measured for the natural targets of Be, C, O, Al, Ca and Ni at lab energies of 8.75, 9.35 and 10.15. Fairly good optical-model fits can be made except for 16 O and for 12 C at 10.15 MeV where an extra oscillation appears in the diffraction-like pattern. The energy dependence of the oxygen data is pronounced, and the optical model does not appear to be valid at these energies. The variation of best-fit, optical model parameters was studied with an automatic search routine. In the final analysis geometric parameters for a given nucleus were fixed at average values and a more or less consistent set of best-fit parameters was obtained for the three energies. However, the corresponding best-fit values of the real potential varied widely from nucleus. For the three heaviest nuclei, the values of the radius parameter are larger and the diffuseness parameter smaller than reported at higher energies.

Published
1967
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