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21. |
SASSYER: A Gas‐filled spectrometer at Yale |
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AIP Conference Proceedings,
Volume 638,
Issue 1,
1902,
Page 125-130
J. J. Ressler,
R. Kru¨cken,
C. W. Beausang,
J. M. D’Auria,
H. Amro,
R. F. Casten,
M. A. Caprio,
G. Gu¨rdal,
Z. Harris,
C. Hutter,
A. A. Hecht,
D. Meyer,
M. Sciacciatano,
N. V. Zamfir,
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摘要:
The Wright Nuclear Structure Laboratory has recently acquired a gas‐filled recoil separator previously used at Berkeley National Laboratory for heavy‐element synthesis. The separator will be used to separate reaction recoils from primary beam particles and fission products following target bombardment. Commisioning of the separator has recently been completed, and the structure of203Rn investigated. © 2002 American Institute of Physics
ISSN:0094-243X
DOI:10.1063/1.1517950
出版商:AIP
年代:1902
数据来源: AIP
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22. |
Nuclear Data Strategies for Mapping the Cosmos |
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AIP Conference Proceedings,
Volume 638,
Issue 1,
1902,
Page 131-132
Michael S. Smith,
Richard A. Meyer,
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摘要:
Significant advances are being made in understanding the structure of nuclei, especially those far from stability. The information from many such studies is vital to solving some important puzzles in astrophysics, such as the origin of the elements and the evolution of stars. However, dedicated efforts in data compilation, evaluation, dissemination, and coordination are needed to ensure that the latest nuclear measurements and theoretical calculations can be effectively utilized for astrophysics studies. A number of nuclear data strategies for astrophysics are presented. © 2002 American Institute of Physics
ISSN:0094-243X
DOI:10.1063/1.1517951
出版商:AIP
年代:1902
数据来源: AIP
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23. |
Nuclear Structure Studies with Rare Isotope Beams: Knockout Reactions |
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AIP Conference Proceedings,
Volume 638,
Issue 1,
1902,
Page 133-140
B. M. Sherrill,
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摘要:
This paper outlines the role of the Isospin Laboratory Steering Committee in the process that has lead to our current understand of the possibilities and challenges related to an advance rare isotope research facility. One of the challenges is to extract information using only weak rare isotope beams. Knock‐out reactions are used as an example to illustrate that access to even weak beams can provide a large amount of nuclear structure information. © 2002 American Institute of Physics
ISSN:0094-243X
DOI:10.1063/1.1517952
出版商:AIP
年代:1902
数据来源: AIP
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24. |
Modification Of Shell Structure In p‐sd Shell Nuclei Studied by Radioactive Beams |
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AIP Conference Proceedings,
Volume 638,
Issue 1,
1902,
Page 141-148
Isao Tanihata,
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摘要:
Recent studies of interaction cross sections, fragments momentum distributions combined with standard quantities such as mass and beta‐decay Q‐values reveal new dynamic change of shell structures. In particular, special attention is paid on neutron halo nuclei in the p‐sd shell. In halo nuclei and other neutron rich nuclei, the 2s1/2orbital shows irregular behavior. One such extreme case is the new neutron magic numberN=16. The global behavior of 2s1/2shell is discussed in relation to the interaction cross‐sections and fragment momentum distributions. Inconsistencies in understanding these data are pointed out. Peculiar changes of shells are discussed for19C and23O. © 2002 American Institute of Physics
ISSN:0094-243X
DOI:10.1063/1.1517953
出版商:AIP
年代:1902
数据来源: AIP
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25. |
Fine structure in proton emission |
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AIP Conference Proceedings,
Volume 638,
Issue 1,
1902,
Page 149-154
K. P. Rykaczewski,
R. K. Grzywacz,
J. C. Batchelder,
C. R. Bingham,
C. J. Gross,
D. Fong,
J. H. Hamilton,
D. J. Hartley,
P. Hausladen,
J. K. Hwang,
M. Karny,
W. Kro´las,
Y. Larochelle,
T. A. Lewis,
K. H. Maier,
J. W. McConnell,
A. Piechaczek,
A. V. Ramayya,
K. Rykaczewski,
D. Shapira,
M. N. Tantawy,
J. A. Winger,
C. ‐H. Yu,
E. F. Zganjar,
A. T. Kruppa,
W. Nazarewicz,
T. Vertse,
K. Hagino,
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摘要:
Deformations and wave functions of proton‐radioactive nuclei are studied using measured fine structure properties of proton emission and microscopic theoretical models. The experimental data are available for131Eu and145Tm decays, as well as for141gsHo, where an observation of fine structure in proton emission is reported for the first time. © 2002 American Institute of Physics
ISSN:0094-243X
DOI:10.1063/1.1517954
出版商:AIP
年代:1902
数据来源: AIP
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26. |
Towards Microscopic Theory of Soft Nuclei |
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AIP Conference Proceedings,
Volume 638,
Issue 1,
1902,
Page 155-160
Vladimir Zelevinsky,
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摘要:
Soft vibrational modes in finite quantum systems are compared with macroscopic phase transitions. I argue that in soft nuclei the quartic anharmonicity dominates the dynamics, sketch the microscopic derivation of the collective Hamiltonian and illustrate by a simple model. © 2002 American Institute of Physics
ISSN:0094-243X
DOI:10.1063/1.1517955
出版商:AIP
年代:1902
数据来源: AIP
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27. |
Nuclear masses and all that: an excursion with many interactions with Rick |
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AIP Conference Proceedings,
Volume 638,
Issue 1,
1902,
Page 161-168
K. Heyde,
R. Fossion,
J. E. Garci´a‐Ramos,
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摘要:
In the present contribution, we show that, although the spectroscopic properties of the monopole pairing force and a zero‐range delta‐function interaction are very similar, results for binding energies when filling up a major shell are radically different past mid‐shell. This has significant consequences for understanding the masses and binding energies of long isotopic chains of nuclei that will be accessible with advanced exotic beam facilities. Consequently, we describe a new method to derive two‐neutron separation energieS2n, treating ground‐state properties as well as excited‐state properties in nuclei,in a consitent way. Results for the whole rare‐earth mass regions are presentend. The recent high‐precison results that have been obtained at ISOLDE in the neutron‐deficient Pb region will be discussed and present a challenge to understand the specific mass trend. © 2002 American Institute of Physics
ISSN:0094-243X
DOI:10.1063/1.1517956
出版商:AIP
年代:1902
数据来源: AIP
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28. |
How random are random nuclei? Shapes, triangles and kites |
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AIP Conference Proceedings,
Volume 638,
Issue 1,
1902,
Page 169-174
R. Bijker,
A. Frank,
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摘要:
We discuss the origin of the regular features that were observed in numerical studies of the interacting boson model with random interactions. © 2002 American Institute of Physics
ISSN:0094-243X
DOI:10.1063/1.1517957
出版商:AIP
年代:1902
数据来源: AIP
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29. |
Two neutron separation energies and phase transitions in the Interacting Boson Model |
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AIP Conference Proceedings,
Volume 638,
Issue 1,
1902,
Page 175-179
J. E. Garci´a‐Ramos,
R. Fossion,
K. Heyde,
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摘要:
In the framework of the interacting boson model the three transitional regions (rotational‐vibrational, rotational‐&ggr;‐unstable and, vibrational‐&ggr;‐unstable transitions) are reanalyzed. A new kind of plot is presented for studying phase transitions in finite systems such as atomic nuclei. The importance of analyzing binding energies and not only energy spectra and electromagnetic transitions, describing transitional regions is emphasized and we discuss a new method in order to provide a consistent description of both, ground‐state and excited‐state properties. © 2002 American Institute of Physics
ISSN:0094-243X
DOI:10.1063/1.1517958
出版商:AIP
年代:1902
数据来源: AIP
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30. |
Geometry of random interactions |
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AIP Conference Proceedings,
Volume 638,
Issue 1,
1902,
Page 180-187
P. Chau Huu‐Tai,
A. Frank,
N. Smirnova,
P. Van Isacker,
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摘要:
It is argued that spectral features of quantal systems with random interactions can be given a geometric interpretation. This conjecture is investigated in the context of two simple models: a system of randomly interacting d bosons and one of randomly interacting fermions in aj=72shell. In both examples the probability for a specific state to become the ground state is shown to be related to a geometric property of a (hyper)polyhedron which is interaction‐independent and is determined solely by particle number, shell size and symmetry character of the state. Extensions of these ideas to more general situations are discussed. © 2002 American Institute of Physics
ISSN:0094-243X
DOI:10.1063/1.1517959
出版商:AIP
年代:1902
数据来源: AIP
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