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Wilson AN, Korichi A, Siem S, Astier A, Bazzacco D, Bednarczyk P, Bergström MH, Chmel S, Cullen DM, Davidson PM, Görgen A, Hannachi F, Hübel H, Kintz N, Lauritsen T, Lopez-Martens A, Lunardi S, Naguleswaran S, Nyakó BM, Rejmund M, Schönwasser G, Schück C, Sharpey-Schafer JF, Timar J, Wadsworth R, Libert J. Two-particle separation energy trends in the superdeformed well. Phys Rev Lett 2010; 104:162501. [PMID: 20482043 DOI: 10.1103/physrevlett.104.162501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2009] [Indexed: 05/29/2023]
Abstract
A measurement of the energy and spin of superdeformed states in 190Hg, obtained through the observation of transitions directly linking superdeformed and normal states, expands the number of isotopes in which binding energies at superdeformation are known. Comparison with neighboring nuclei shows that two-proton separation energies are higher in the superdeformed state than in the normal state, despite the lower Coulomb barrier and lower total binding energy. This unexpected result provides a critical test for nuclear models.
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Affiliation(s)
- A N Wilson
- Research School of Physics and Engineering, The Australian National University, Canberra, ACT 0200 Australia.
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Wilson AN, Singh AK, Hübel H, Davidson PM, Görgen A, Rossbach D, Korichi A, Astier A, Azaiez F, Bazzacco D, Bourgeois C, Buforn N, Byrne AP, Dracoulis GD, Hannachi F, Hauschild K, Korten W, Kröll T, Lane GJ, Lopez-Martens A, Redon N, Reiter P, Rossi-Alvarez C, Schonwasser G, Stezowski O, Thirolf PG. Excitation energies of superdeformed States in 196Pb: towards a systematic study of the second well in Pb isotopes. Phys Rev Lett 2005; 95:182501. [PMID: 16383897 DOI: 10.1103/physrevlett.95.182501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2005] [Indexed: 05/05/2023]
Abstract
The excitation energy of the lowest-energy superdeformed band in 196Pb is established using the techniques of time-correlated gamma-ray spectroscopy. Together with previous measurements on 192Pb and 194Pb, this result allows superdeformed excitation energies, binding energies, and two-proton and two-neutron separation energies to be studied systematically, providing stringent tests for current nuclear models. The results are examined for evidence of a "superdeformed shell gap."
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Affiliation(s)
- A N Wilson
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia.
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Wilson AN, Dracoulis GD, Byrne AP, Davidson PM, Lane GJ, Clark RM, Fallon P, Görgen A, Macchiavelli AO, Ward D. Direct decays from superdeformed states in 192Pb observed using time-correlated gamma-ray spectroscopy. Phys Rev Lett 2003; 90:142501. [PMID: 12731911 DOI: 10.1103/physrevlett.90.142501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2002] [Indexed: 05/24/2023]
Abstract
Correlations of decays above and below isomeric states in the normally deformed minimum of 192Pb have been used to identify discrete transitions in the decay of the superdeformed (SD) band. The data establish the absolute excitation energy of the lowest observed SD level as 4.425 MeV. Extrapolation to the bandhead indicates that the excitation energy of the superdeformed well in 192Pb is 0.5 MeV lower than in the heavier isotope 194Pb. The results confirm the trend to decreasing excitation energy with decreasing neutron number predicted by both a macroscopic Strutinsky method approach and microscopic mean field calculations.
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Affiliation(s)
- A N Wilson
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200 Australia.
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Lauritsen T, Janssens RVF, Carpenter MP, Fallon P, Herskind B, Jenkins DG, Khoo TL, Kondev FG, Lopez-Martens A, Macchiavelli AO, Ward D, Saleem KA, Ahmad I, Clark RM, Cromaz M, Døssing T, Heinz AM, Korichi A, Lane G, Lister CJ, Seweryniak D. Octupole vibration in superdeformed 152(66)Dy86. Phys Rev Lett 2002; 89:282501. [PMID: 12513136 DOI: 10.1103/physrevlett.89.282501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2002] [Indexed: 05/24/2023]
Abstract
Nine transitions of dipole character have been identified linking an excited superdeformed (SD) band in 152Dy to the yrast SD band. As a result, the excitation energy of the lowest level in the excited SD band has been measured to be 14 238 keV. This corresponds to a 1.3 MeV excitation above the SD ground state. The levels in this band have tentatively been determined to be of negative parity and odd spin. The measured properties are consistent with an interpretation in terms of a rotational band built on a collective octupole vibration.
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Affiliation(s)
- T Lauritsen
- Argonne National Laboratory, Argonne, Illinois 60439, USA
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Lauritsen T, Carpenter MP, Døssing T, Fallon P, Herskind B, Janssens RVF, Jenkins DG, Khoo TL, Kondev FG, Lopez-Martens A, Macchiavelli AO, Ward D, Abu Saleem KS, Ahmad I, Clark R, Cromaz M, Greene JP, Hannachi F, Heinz AM, Korichi A, Lane G, Lister CJ, Reiter P, Seweryniak D, Siem S, Vondrasek RC, Wiedenhöver I. Direct decay from the superdeformed band to the yrast line in 15266Dy86. Phys Rev Lett 2002; 88:042501. [PMID: 11801113 DOI: 10.1103/physrevlett.88.042501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2001] [Indexed: 05/23/2023]
Abstract
The excitation energy, spin, and parity of the yrast superdeformed band in 152Dy have been firmly established. The evidence comes mainly from the measured properties of a 4011 keV single-step transition connecting the yrast superdeformed level fed by the 693 keV transition to the 27- yrast state. Four additional, weaker, linking gamma rays have been placed as well. The excitation energy of the lowest superdeformed band member is 10 644 keV and its spin and parity are determined to be 24+.
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Affiliation(s)
- T Lauritsen
- Argonne National Laboratory, Argonne, Illinois 60439, USA
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Siem S, Reiter P, Khoo TL, Lauritsen T, Carpenter MP, Ahmad I, Amro H, Calderin I, Døssing T, Fischer SM, Garg U, Gassmann D, Hackman G, Hannachi F, Janssens RVF, Kharraja B, Korichi A, Lopez-martens A, Moore EF, Nisius D, Schuck C. Decay out of the Yrast Superdeformed Band in 191Hg. The Nucleus 2000. [DOI: 10.1007/978-1-4615-4257-5_57] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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Lopez-martens AP. Study of the Strength Distribution of the Primary γ-Rays in the Decay From Superdeformed States in194Hg. The Nucleus 2000. [DOI: 10.1007/978-1-4615-4257-5_39] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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Rowley N. New Ideas in Nuclear Structure Physics. The Nucleus 2000. [DOI: 10.1007/978-1-4615-4257-5_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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Rudolph D. Prompt Particle Decays of Deformed Second Minima. The Nucleus 2000. [DOI: 10.1007/978-1-4615-4257-5_53] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Krücken R, Dewald A, Bazzacco D, Rossi-Alvarez C. Decay out of superdeformed bands in the A. Phys Rev C Nucl Phys 1996; 54:1182-1188. [PMID: 9971453 DOI: 10.1103/physrevc.54.1182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Lopez-Martens A, Hannachi F, Dossing T, Schück C, Collatz R, Gueorguieva E, Vieu C, Leoni S, Herskind B, Khoo TL, Lauritsen T, Ahmad I, Blumenthal DJ, Carpenter MP, Gassmann D, Janssens RV, Nisius D, Korichi A, Bourgeois C, Astier A, Ducroux L, Meyer M, Redon N, Sharpey-Schafer JF, Wilson AN, Korten W, Bracco A, Lucas R. Fragmentation of the Decay from the Superdeformed Yrast Band in 192Hg. Phys Rev Lett 1996; 77:1707-1710. [PMID: 10063151 DOI: 10.1103/physrevlett.77.1707] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Petrache CM, Bazzacco D, Lunardi S, Venturelli R, Pavan P, Medina NH, Rao MN, Burch R, Gadea A, Maron G, Napoli DR, Zhu L, Wyss R. Decay Out of the Yrast and Excited Highly Deformed Bands in the Even-Even Nucleus 134Nd. Phys Rev Lett 1996; 77:239-242. [PMID: 10062401 DOI: 10.1103/physrevlett.77.239] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Fischer SM, Carpenter MP, Janssens RV, Crowell B, Ahmad I, Blumenthal DJ, Khoo TL, Lauritsen T, Nisius D, Reviol W, Mueller WF, Riedinger LL, Smith BH, Cederwall B. Alignment additivity in the two-quasiparticle superdeformed bands of 192Tl. Phys Rev C Nucl Phys 1996; 53:2126-2133. [PMID: 9971187 DOI: 10.1103/physrevc.53.2126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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