Coulomb shifts and shape changes in the mass 70 region

Singh, B. S. Nara; Steer, A. N.; Jenkins, D. G.; Wadsworth, R.; Bentley, M. A.; Davies, P.; Glover, R.; Pattabiraman, Nagarajan; Lister, C. J.; Grahn, T.; Greenlees, P. T.; Jones, P.; Julin, R.; Juutinen, S.; Leino, M.; Nyman, M.; Pakarinen, J.; Rahkila, P.; Sarén, J.; Scholey, C.; Sorri, J.; Uusitalo, J.; Butler, P. A.; Dimmock, Matthew; Joss, D. T.; Thomson, James A.; Cederwall, B.; Hadinia, B.; Sandzelius, M.

doi:10.1103/physrevc.75.061301

Cited by 34 publications

(20 citation statements)

References 34 publications

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“…The normal, positive, trend in the behavior of the CED as a function of spin has previously been attributed to Coriolis antipairing effects [13]. On the other hand, the negative trend observed for the mass 70 pair was initially attributed to the Thomas-Erhman shift [14], but a different interpretation, based on a prolate shape evolution of the nuclei with increasing spin, has also been suggested [15]. Other, theoretically based, interpretations regarding the anomalous behavior of the mass 70 systems have been proposed.…”

Section: Introductionmentioning

confidence: 97%

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Spectroscopy of Kr70 and isospin symmetry in the T=1 fpg shell nuclei

Debenham¹,

Bentley²,

Davies³

et al. 2016

Phys. Rev. C

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The recoil-β tagging technique has been used in conjunction with the 40 Ca( 32 S ,2n) reaction at a beam energy of 88 MeV to identify transitions associated with the decay of the 2 + and, tentatively, 4 + states in the nucleus 70 Kr. These data are used, along with previously published data, to examine the triplet energy differences (TED) for the mass 70 isobars. The experimental TED values are compared with shell model calculations, performed with the JUN45 interaction in the fpg model space, that include a J = 0 isospin nonconserving (INC) interaction with an isotensor strength of 100 keV. The agreement is found to be very good up to spin 4 and supports the expectation for analog states that all three nuclei have the same oblate shape at low-spin. The A = 70 results are compared with the experimental and shell model predicted TED and mirror energy differences (MED) for the mass 66 and 74 systems. The comparisons clearly demonstrate the importance of the isotensor INC interaction in replicating the TED data in this region. Issues related to the observed MED values and their interpretation within the shell model are discussed.

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Section: Introductionmentioning

confidence: 97%

“…This technique has been successfully employed to study several other nuclei in the region, see [12,15,17,18,23].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopy of Kr70 and isospin symmetry in the T=1 fpg shell nuclei

Debenham¹,

Bentley²,

Davies³

et al. 2016

Phys. Rev. C

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“…All this means that new experimental approaches need to be investigated. The recent development of the recoil-β-tagging (RBT) technique [6,13,14] provides a tool to extend the use of tagging methodology to the region of exotic medium-mass nuclei around the N = Z line. In the RBT method, the recoil formed via fusion-evaporation reaction is identified by correlating a β particle originating from the β decay to the recoil from which it originated.…”

Section: Introductionmentioning

confidence: 99%

“…Most importantly, candidates for the 4 + → 2 + and 6 + → 4 + transitions in the T = 1 band have been identified. The results are compared with shell-model calculations using the modern JUN45 interaction in the pf 5/2 g 9/2 model space.alignment of the valence nucleons [5], shape changes as a function of spin [6], and the evolution of nuclear radii along the yrast line [7].Two isomeric states have been previously identified in 66 As [8]. In more recent studies, the decay of the isomers was used as a tag to identify excited states above the isomeric states [9] and new prompt γ rays were associated with 66 As, without the ability to observe delayed transitions, in Ref.…”

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Recoil-βtagging study of theN=Znucleus66As

Ruotsalainen¹,

Scholey²,

Julin³

et al. 2013

Phys. Rev. C

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An in-beam study has been performed to further investigate the known isomeric decays and to identify T = 1 excited states in the medium-heavy N = Z = 33 nucleus 66 As. The fusion-evaporation reaction 40 Ca( 28 Si,pn) 66 As was employed at beam energies of 75 and 83 MeV. The half-lives and ordering of two known isomeric states in 66 As have been determined with improved accuracy. In addition, several prompt γ -ray transitions from excited states, both bypassing and decaying to the isomeric states in 66 As, have been observed. Most importantly, candidates for the 4 + → 2 + and 6 + → 4 + transitions in the T = 1 band have been identified. The results are compared with shell-model calculations using the modern JUN45 interaction in the pf 5/2 g 9/2 model space.alignment of the valence nucleons [5], shape changes as a function of spin [6], and the evolution of nuclear radii along the yrast line [7].Two isomeric states have been previously identified in 66 As [8]. In more recent studies, the decay of the isomers was used as a tag to identify excited states above the isomeric states [9] and new prompt γ rays were associated with 66 As, without the ability to observe delayed transitions, in Ref.[10]. In the current work, both the isomeric and the prompt T = 0 and T = 1 structures have been studied. The half-lives and ordering of the isomeric states have been determined with improved accuracy and internal conversion coefficients have been deduced for the transitions deexciting the isomers, allowing the determination of the corresponding experimental B(E2) transition strengths. Recent experimental [10] and theoretical [11] work has investigated the CED in the A = 66 ( 66 As/ 66 Ge) and A = 70 ( 70 Br/ 70 Se) systems. The present work agrees with some of the findings reported in Ref.[10], but differs for the T = 1, I π = 6 + state resulting in a positive CED behavior.The odd-odd N = Z nuclei in the mass A ∼ 60-70 region provide an opportunity to test shell-model (SM) interactions and model spaces for these midmass nuclei. In the present work SM calculations have been performed using the modern JUN45 interaction [12] and a pf 5/2 g 9/2 model space. The experimental results are compared with the SM predictions in terms of level energies, CED, and B(E2) values.

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Excited Nuclear States for Y-78 (Yttrium)

Sukhoruchkin

Soroko

2012

Landolt-Börnstein - Group I Elementary Particles, Nuclei and Atoms

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Coulomb shifts and shape changes in the mass 70 region

Cited by 34 publications

References 34 publications

Spectroscopy of Kr70 and isospin symmetry in the T=1 fpg shell nuclei

Spectroscopy of Kr70 and isospin symmetry in the T=1 fpg shell nuclei

Recoil-βtagging study of theN=Znucleus66As

Excited Nuclear States for Y-78 (Yttrium)

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