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Boso A, Lenzi SM, Recchia F, Bonnard J, Zuker AP, Aydin S, Bentley MA, Cederwall B, Clement E, de France G, Di Nitto A, Dijon A, Doncel M, Ghazi-Moradi F, Gadea A, Gottardo A, Henry T, Hüyük T, Jaworski G, John PR, Juhász K, Kuti I, Melon B, Mengoni D, Michelagnoli C, Modamio V, Napoli DR, Nyakó BM, Nyberg J, Palacz M, Timár J, Valiente-Dobón JJ. Neutron Skin Effects in Mirror Energy Differences: The Case of ^{23}Mg-^{23}Na. Phys Rev Lett 2018; 121:032502. [PMID: 30085775 DOI: 10.1103/physrevlett.121.032502] [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: 04/13/2018] [Indexed: 06/08/2023]
Abstract
Energy differences between analogue states in the T=1/2 ^{23}Mg-^{23}Na mirror nuclei have been measured along the rotational yrast bands. This allows us to search for effects arising from isospin-symmetry-breaking interactions (ISB) and/or shape changes. Data are interpreted in the shell model framework following the method successfully applied to nuclei in the f_{7/2} shell. It is shown that the introduction of a schematic ISB interaction of the same type of that used in the f_{7/2} shell is needed to reproduce the data. An alternative novel description, applied here for the first time, relies on the use of an effective interaction deduced from a realistic charge-dependent chiral nucleon-nucleon potential. This analysis provides two important results: (i) The mirror energy differences give direct insight into the nuclear skin; (ii) the skin changes along the rotational bands are strongly correlated with the difference between the neutron and proton occupations of the s_{1/2} "halo" orbit.
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Affiliation(s)
- A Boso
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - S M Lenzi
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - F Recchia
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - J Bonnard
- INFN, Sezione di Padova, I-35131 Padova, Italy
- Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, Université Paris-Saclay, F-91405 Orsay, France
| | - A P Zuker
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- Universitè de Strasbourg and IPHC, F-67000 Strasbourg, France
| | - S Aydin
- Aksaray Universitesi, Department of Physics, TR-68100 Aksaray, Turkey
| | - M A Bentley
- University of York, Department of Physics, YO10 5DD York, United Kingdom
| | - B Cederwall
- Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - E Clement
- GANIL, CEA/DRF-CNRS/IN2P3, F-14076 Caen, France
| | - G de France
- GANIL, CEA/DRF-CNRS/IN2P3, F-14076 Caen, France
| | - A Di Nitto
- Dipartimento di Fisica and INFN, Sezione di Napoli, I-80126 Napoli, Italy
- Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - A Dijon
- GANIL, CEA/DRF-CNRS/IN2P3, F-14076 Caen, France
| | - M Doncel
- Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - F Ghazi-Moradi
- Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - A Gadea
- IFIC, CSIC-Universitat de València, E-46980 Valencia, Spain
| | - A Gottardo
- INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), Italy
| | - T Henry
- University of York, Department of Physics, YO10 5DD York, United Kingdom
| | - T Hüyük
- IFIC, CSIC-Universitat de València, E-46980 Valencia, Spain
| | - G Jaworski
- Heavy Ion Laboratory, Warsaw University, 02-093 Warszawa, Poland
| | - P R John
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - K Juhász
- Institute of Nuclear Research (ATOMKI) of Hung. Acad. Sciences, H-4001 Debrecen, Hungary
| | - I Kuti
- Institute of Nuclear Research (ATOMKI) of Hung. Acad. Sciences, H-4001 Debrecen, Hungary
| | - B Melon
- Dipartimento di Fisica and INFN, Sezione di Firenze, I-50019 Firenze, Italy
| | - D Mengoni
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - C Michelagnoli
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- INFN, Sezione di Padova, I-35131 Padova, Italy
| | - V Modamio
- INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), Italy
| | - D R Napoli
- INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), Italy
| | - B M Nyakó
- Institute of Nuclear Research (ATOMKI) of Hung. Acad. Sciences, H-4001 Debrecen, Hungary
| | - J Nyberg
- Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
| | - M Palacz
- Heavy Ion Laboratory, Warsaw University, 02-093 Warszawa, Poland
| | - J Timár
- Institute of Nuclear Research (ATOMKI) of Hung. Acad. Sciences, H-4001 Debrecen, Hungary
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Bonnard J, Lenzi SM, Zuker AP. Neutron Skins and Halo Orbits in the sd and pf Shells. Phys Rev Lett 2016; 116:212501. [PMID: 27284653 DOI: 10.1103/physrevlett.116.212501] [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: 01/12/2016] [Indexed: 06/06/2023]
Abstract
The strong dependence of Coulomb energies on nuclear radii makes it possible to extract the latter from calculations of the former. The resulting estimates of neutron skins indicate that two mechanisms are involved. The first one-isovector monopole polarizability-amounts to noting that when a particle is added to a system it drives the radii of neutrons and protons in different directions, tending to equalize the radii of both fluids independently of the neutron excess. This mechanism is well understood and the Duflo-Zuker (small) neutron skin values derived 14 years ago are consistent with recent measures and estimates. The alternative mechanism involves halo orbits whose huge sizes tend to make the neutron skins larger and have a subtle influence on the radial behavior of sd and pf shell nuclei. In particular, they account for the sudden rise in the isotope shifts of nuclei beyond N=28 and the near constancy of radii in the A=40-56 region. This mechanism, detected here for the first time, is not well understood and may well go beyond the Efimov physics usually associated with halo orbits.
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Affiliation(s)
- J Bonnard
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova, 35131 Padova, Italy
| | - S M Lenzi
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova, 35131 Padova, Italy
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
| | - A P Zuker
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, I-35131 Padova, Italy
- Université de Strasbourg, IPHC, CNRS, UMR7178, 23 rue du Loess, 67037 Strasbourg, France
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Gottardo A, Valiente-Dobón JJ, Benzoni G, Nicolini R, Gadea A, Lunardi S, Boutachkov P, Bruce AM, Górska M, Grebosz J, Pietri S, Podolyák Z, Pfützner M, Regan PH, Weick H, Alcántara Núñez J, Algora A, Al-Dahan N, de Angelis G, Ayyad Y, Alkhomashi N, Allegro PRP, Bazzacco D, Benlliure J, Bowry M, Bracco A, Bunce M, Camera F, Casarejos E, Cortes ML, Crespi FCL, Corsi A, Denis Bacelar AM, Deo AY, Domingo-Pardo C, Doncel M, Dombradi Z, Engert T, Eppinger K, Farrelly GF, Farinon F, Farnea E, Geissel H, Gerl J, Goel N, Gregor E, Habermann T, Hoischen R, Janik R, Klupp S, Kojouharov I, Kurz N, Lenzi SM, Leoni S, Mandal S, Menegazzo R, Mengoni D, Million B, Morales AI, Napoli DR, Naqvi F, Nociforo C, Prochazka A, Prokopowicz W, Recchia F, Ribas RV, Reed MW, Rudolph D, Sahin E, Schaffner H, Sharma A, Sitar B, Siwal D, Steiger K, Strmen P, Swan TPD, Szarka I, Ur CA, Walker PM, Wieland O, Wollersheim HJ, Nowacki F, Maglione E, Zuker AP. New isomers in the full seniority scheme of neutron-rich lead isotopes: the role of effective three-body forces. Phys Rev Lett 2012; 109:162502. [PMID: 23215071 DOI: 10.1103/physrevlett.109.162502] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Revised: 07/26/2012] [Indexed: 06/01/2023]
Abstract
The neutron-rich lead isotopes, up to (216)Pb, have been studied for the first time, exploiting the fragmentation of a primary uranium beam at the FRS-RISING setup at GSI. The observed isomeric states exhibit electromagnetic transition strengths which deviate from state-of-the-art shell-model calculations. It is shown that their complete description demands the introduction of effective three-body interactions and two-body transition operators in the conventional neutron valence space beyond (208)Pb.
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Affiliation(s)
- A Gottardo
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro I-35020, Italy.
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Gadea A, Lenzi SM, Lunardi S, Mărginean N, Zuker AP, de Angelis G, Axiotis M, Martínez T, Napoli DR, Farnea E, Menegazzo R, Pavan P, Ur CA, Bazzacco D, Venturelli R, Kleinheinz P, Bednarczyk P, Curien D, Dorvaux O, Nyberg J, Grawe H, Górska M, Palacz M, Lagergren K, Milechina L, Ekman J, Rudolph D, Andreoiu C, Bentley MA, Gelletly W, Rubio B, Algora A, Nacher E, Caballero L, Trotta M, Moszyński M. Observation of 54Ni: cross-conjugate symmetry in f7/2 mirror energy differences. Phys Rev Lett 2006; 97:152501. [PMID: 17155324 DOI: 10.1103/physrevlett.97.152501] [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: 06/01/2006] [Indexed: 05/12/2023]
Abstract
Gamma decays from excited states up to Jpi=6+ in the N=Z-2 nucleus 54Ni have been identified for the first time. Level energies are compared with those of the isobars 54Co and 54Fe and of the cross-conjugate nuclei of mass A=42. The good but puzzling f7/ cross-conjugate symmetry in mirror and triplet energy differences is analyzed. Shell model calculations reproduce the new data but the necessary nuclear charge-dependent phenomenology is not fully explained by modern nucleon-nucleon potentials.
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Affiliation(s)
- A Gadea
- INFN Laboratori Nazionali di Legnaro, Italy
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Relaño A, Retamosa J, Faleiro E, Molina RA, Zuker AP. 1/f noise and very high spectral rigidity. Phys Rev E Stat Nonlin Soft Matter Phys 2006; 73:026204. [PMID: 16605426 DOI: 10.1103/physreve.73.026204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2005] [Indexed: 05/08/2023]
Abstract
It was recently pointed out that the spectral fluctuations of quantum systems are formally analogous to discrete time series, and therefore their structure can be characterized by the power spectrum of the signal. Moreover, it is found that the power spectrum of chaotic spectra displays a 1/f behavior, while that of regular systems follows a 1/f2 law. This analogy provides a link between the concepts of spectral rigidity and antipersistence. Trying to get a deeper understanding of this relationship, we have studied the correlation structure of spectra with high spectral rigidity. Using an appropriate family of random Hamiltonians, we increase the spectral rigidity up to hindering completely the spectral fluctuations. Analyzing the long range correlation structure a neat power law 1/f has been found for all the spectra, along the whole process. Therefore, 1/f noise is the characteristic fingerprint of a transition that, preserving the scale-free correlation structure, hinders completely the fluctuations of the spectrum.
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Affiliation(s)
- A Relaño
- Departamento de Física Atómica, Molecular y Nuclear, Universidad Complutense de Madrid, 28010 Madrid, Spain
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Ekman J, Rudolph D, Fahlander C, Zuker AP, Bentley MA, Lenzi SM, Andreoiu C, Axiotis M, de Angelis G, Farnea E, Gadea A, Kröll T, Mărginean N, Martinez T, Mineva MN, Rossi-Alvarez C, Ur CA. Unusual isospin-breaking and isospin-mixing effects in the A=35 mirror nuclei. Phys Rev Lett 2004; 92:132502. [PMID: 15089598 DOI: 10.1103/physrevlett.92.132502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2003] [Indexed: 05/24/2023]
Abstract
Excited states have been studied in 35Ar following the 16O(24Mg,1alpha1n)35Ar fusion-evaporation reaction at 60 MeV using the Ge-detector array GASP. A comparison with the mirror nucleus 35Cl shows two remarkable features: (i) A surprisingly large energy difference for the 13/2(-) states, in which the hitherto overlooked electromagnetic spin-orbit term is shown to play a major role, and (ii) a very different decay pattern for the 7/2(-) states, which provides direct evidence of isospin mixing.
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Affiliation(s)
- J Ekman
- Department of Physics, Lund University, S-22100 Lund, Sweden
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Zuker AP. Comment on "Magic numbers in exotic nuclei and spin-isospin properties of the NN interaction". Phys Rev Lett 2003; 91:179201-179202. [PMID: 14611382 DOI: 10.1103/physrevlett.91.179201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2001] [Revised: 07/31/2002] [Indexed: 05/24/2023]
Affiliation(s)
- A P Zuker
- IReS, Bâtiment 27, BP 28, F-67037 Strasbourg Cedex 2, France
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Abstract
It is shown that a very simple three-body monopole term can solve practically all the spectroscopic problems-in the p, sd, and pf shells-that were hitherto assumed to need drastic revisions of the realistic potentials.
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Affiliation(s)
- A P Zuker
- IReS, Bâtiment 27, IN2P3-CNRS/Université Louis Pasteur, BP 28, F-67037 Strasbourg Cedex 2, France
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Zuker AP, Lenzi SM, Martínez-Pinedo G, Poves A. Isobaric multiplet yrast energies and isospin nonconserving forces. Phys Rev Lett 2002; 89:142502. [PMID: 12366038 DOI: 10.1103/physrevlett.89.142502] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2002] [Indexed: 05/23/2023]
Abstract
The isovector and isotensor energy differences between yrast states of isobaric multiplets in the lower half of the pf region are quantitatively reproduced in a shell model context. The isospin nonconserving nuclear interactions are found to be at least as important as the Coulomb potential. Their isovector and isotensor channels are dominated by J=2 and J=0 pairing terms, respectively. The results are sensitive to the radii of the states, whose evolution along the yrast band can be accurately followed.
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Affiliation(s)
- A P Zuker
- IReS, Bâtiment 27, IN2P3-CNRS/Université Louis Pasteur, B.P. 28, F-67037 Strasbourg Cedex 2, France
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Velázquez V, Zuker AP. Spectroscopy with random and displaced random ensembles. Phys Rev Lett 2002; 88:072502. [PMID: 11863890 DOI: 10.1103/physrevlett.88.072502] [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: 06/08/2001] [Revised: 07/26/2001] [Indexed: 05/23/2023]
Abstract
Because of the time reversal invariance of the angular momentum operator J2, the average energies and variances at fixed J for random two-body Hamiltonians exhibit odd-even- J staggering that may be especially strong for J = 0. It is shown that upon ensemble averaging over random runs, this behavior is reflected in the yrast states. Displaced (attractive) random ensembles lead to rotational spectra with strongly enhanced B(E2) transitions for a certain class of model spaces. It is explained how to generalize these results to other forms of collectivity.
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Affiliation(s)
- V Velázquez
- IRES, Bâtiment 27, IN2P3-CNRS/Université Louis Pasteur BP 28, F-67037 Strasbourg Cedex 2, France
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Lenzi SM, Mărginean N, Napoli DR, Ur CA, Zuker AP, de Angelis G, Algora A, Axiotis M, Bazzacco D, Belcari N, Bentley MA, Bizzeti PG, Bizzeti-Sona A, Brandolini F, von Brentano P, Bucurescu D, Cameron JA, Chandler C, De Poli M, Dewald A, Eberth H, Farnea E, Gadea A, Garces-Narro J, Gelletly W, Grawe H, Isocrate R, Joss DT, Kalfas CA, Klug T, Lampman T, Lunardi S, Martínez T, Martínez-Pinedo G, Menegazzo R, Nyberg J, Podolyak Z, Poves A, Ribas RV, Rossi Alvarez C, Rubio B, Sánchez-Solano J, Spolaore P, Steinhardt T, Thelen O, Tonev D, Vitturi A, von Oertzen W, Weiszflog M. Coulomb energy differences in t = 1 mirror rotational bands in (50)Fe and (50)Cr. Phys Rev Lett 2001; 87:122501. [PMID: 11580500 DOI: 10.1103/physrevlett.87.122501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2001] [Indexed: 05/23/2023]
Abstract
Gamma rays from the N = Z-2 nucleus (50)Fe have been observed, establishing the rotational ground state band up to the state J(pi) = 11+ at 6.994 MeV excitation energy. The experimental Coulomb energy differences, obtained by comparison with the isobaric analog states in its mirror (50)Cr, confirm the qualitative interpretation of the backbending patterns in terms of successive alignments of proton and neutron pairs. A quantitative agreement with experiment has been achieved by exact shell model calculations, incorporating the differences in radii along the yrast bands, and properly renormalizing the Coulomb matrix elements in the pf model space.
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Affiliation(s)
- S M Lenzi
- Dipartimento di Fisica and INFN, Padua, Italy
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Zuker AP, Retamosa J, Poves A, Caurier E. Spherical shell model description of rotational motion. Phys Rev C Nucl Phys 1995; 52:R1741-R1745. [PMID: 9970755 DOI: 10.1103/physrevc.52.r1741] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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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Caurier E, Martínez-Pinedo G, Poves A, Zuker AP. Gamow-Teller strength in 54Fe and 56Fe. Phys Rev C Nucl Phys 1995; 52:R1736-R1740. [PMID: 9970754 DOI: 10.1103/physrevc.52.r1736] [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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Caurier E, Egido JL, Martínez-Pinedo G, Poves A, Retamosa J, Robledo LM, Zuker AP. Intrinsic vs laboratory frame description of the deformed nucleus 48Cr. Phys Rev Lett 1995; 75:2466-2469. [PMID: 10059319 DOI: 10.1103/physrevlett.75.2466] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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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Civitarese O, Dussel GG, Zuker AP. Universality of temperature-dependent effects in finite many-fermion systems. Phys Rev C Nucl Phys 1989; 40:2900-2903. [PMID: 9966303 DOI: 10.1103/physrevc.40.2900] [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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