Anomalous Behavior of High-Spin States in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Cm</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>248</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Piercey, R. B.; Hamilton, J. H.; Ramayya, A. V.; Emling, H.; Fuchs, Philipp; Grosse, E.; Schwalm, D.; Wollersheim, H. J.; Trautmann, Ν.; Faessler, Amand; Płoszajczak, M.

doi:10.1103/physrevlett.46.415

Cited by 40 publications

(13 citation statements)

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“…The nuclear transition can be accompanied by internal electronpositron pair creation [4][5][6]. Contrary to E0-processes nuclear transitions of multipolarity E1 or E2 should also be observable in the emitted photon spectra provided that proper Doppler shift corrections are performed as in [7]. In this paper we will prove the following assertion: If the observed structure in the positron distribution originates from E0-pair production one should definetely observe also a peak in the high energy part (E e_ > 1 MeV) of the a-electron distribution originating from K-shell conversion.…”

Section: Introductionmentioning

confidence: 99%

Internal electron-positron pair production from electric monopole transitions

Soff¹,

Schlüter

Greiner

1981

Z Physik A

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Nuclear E0-transitions above the pair production threshold of co--2rn c2,-, 1 MeV are considered. The ration r/of the electron-positron pair creation probability to the K-shell conversion probability is calculated. For 92U and co= 1,450keV a typical value of t/ =2,10 .3 is obtained. Good agreement with experimental data is found. Our numerical results for finite size nuclei are compared with analytical expressions utilizing relativistic electron wavefunctions for point nuclei. The energy distributions of emitted positrons are presented for various nuclear charge values and transition energies. The possibility of monoenergetic positron emission is discussed. Of particular interest is the relation of the theoretical results to the recently observed structure in the positron spectra, which have been measured in high energy collisions of very heavy ions.

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Section: Introductionmentioning

confidence: 99%

Internal electron-positron pair production from electric monopole transitions

Soff¹,

Schlüter

Greiner

1981

Z Physik A

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“…[40], [44], [45], [46]. This suggests that discrete states with spins higher than 30h could be populated in one-neutron transfer reactions using P b projectiles.…”

Section: Chaptermentioning

confidence: 99%

“…In the actinide region, however, most of the information on rotational states (high-spin states) has been from Coulomb excitation [36], [37] , [38] , [39], [40] Figure 3.1. The exact details for each experiment will be given in later sections.…”

Section: Introductionmentioning

confidence: 99%

In-beam studies of high-spin states of actinide nuclei

Stoyer

1990

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High-spin states in the actinides have been studied using Coulomb-excitation, inelastic excitation reactions, and one-neutron transfer reactions. Experimental data are presented for states in 232U, 233U 7 -234U 7 235U, 2 3 8 P~ and 2 3 9 P~ from a variety of reactions. Energy levels, moments-of-inertia, aligned angular momentum, Routhians, gamma-ray intensities, and cross-sections are presented MI for most cases. Additional spectroscopic information (magnetic moments, mixing ratios, and g-factors) is presented for 233U. One-and two-neutron transfer reaction mechanisms and the possibility of band crossings (backbending) are discussed. A discussion of odd-A band fitting and Cranking calculations is presented to aid in the interpretation of rotational energy levels and alignment. In addition, several theoretical calculations of rotational populations for inelastic excitation and neutron transfer are compared to the data. Intratheory comparisons between the Sudden Approximation, Semi-Classical, and Alder-Winther-DeBoer methods are made. In connection with the theory development, the possible signature for the nuclear SQUID effect is discussed. DedicationThis thesis would have been impossible without the support of the following people:(1) To all those many people I've had the fortune of interacting with during my learningexperiences while performing this and related work-too many to acknowledge individually, but certainly not forgotten.(2) To Dr. Richard A. Meyer who welcomed me to my first job in Nuclear Chemistry, pointed me in the right direction at Berkeley, and whom I consider a good friend.(3) To my brother, Dale, who first provoked in me the curiousity of a scientist; to my new sister-in-law, Janice, whose only connection with this thesis was a concern that I not recite it at her wedding; and to my parents, Lyn and Dorothy, who, though it is probably still somewhat of a mystery to them, nevertheless gave me the support and encouragement to "do whatever it is I do".(4) And lastly, to Dr. John Rasmussen, whom it has been an honor to work for during my graduate studies. His patience, kindness, creativity, and guidance have been generous during my stay at LBL, and I am eternally in his debt. Acknowledgements

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“…It was suggested in ref. [2,3] that the anomalous increase of ~ in 238U and other actinides is mainly due to RAL of a proton pair zi13/2, even though, zi13/2 and ~J15/2 pairs of nucleons decouple at almost the same rotational frequency. CHFB calculations [2] predict the RAL at too small values of angular momenta and a steep raise of the moment of inertia already at low I-values.…”

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confidence: 96%