Investigation into the semimagic nature of the tin isotopes through electromagnetic moments

Allmond, J. M.; Stuchbery, A.E.; Galindo-Uribarri, A.; Padilla‐Rodal, E.; Radford, D. C.; Batchelder, J. C.; Bingham, C. R.; Howard, M. E.; Liang, J. F.; Manning, B.; Pain, S. D.; Stone, N. J.; Varner, R. L.; Yu, C. H.

doi:10.1103/physrevc.92.041303

Cited by 49 publications

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“…Magnetic moments of the 2 + 1 states were previously measured in the even-even stable 112−124 Sn isotopes [9,[11][12][13] as well as in radioactive 126,128 Sn [14,15]. However, experiments using transient field (TF) or recoil-invacuum techniques and beam energies both below and above the Coulomb barrier, yielded results which challenge comparisons with theoretical calculations.…”

Section: Introductionmentioning

confidence: 78%

“…The reduced transition probability data in 104−134 Sn ( [1][2][3][4][5][6][7][8][9][10] and references therein), follow only above midshell (A = 116) the * Electronic address: kum@physics.rutgers.edu parabola-like curve of the shell model expectations [6]. For nuclei below midshell the B(E2) values are larger than expected but finally decrease at N = 54, as the doubly-closed shell Z = N = 50 is approached.…”

Section: Introductionmentioning

confidence: 99%

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Z=50core stability inSn110from magnetic-moment and lifetime measurements

et al. 2016

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Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Z=50core stability inSn110from magnetic-moment and lifetime measurements

et al. 2016

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“…The RIV technique has proved to be a powerful method to measure the g factors of excited states of neutron-rich nuclei produced as radioactive beams, particularly in the tin and tellurium isotopes near the neutron-rich doubly magic nuclide 132 Sn [12][13][14][15][16]. One of the method's advantages is that the g factor of the 2 + 1 state can be measured simultaneously with the B(E2; 0 + → 2 + ) and Q(2 + ) [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…One of the method's advantages is that the g factor of the 2 + 1 state can be measured simultaneously with the B(E2; 0 + → 2 + ) and Q(2 + ) [14][15][16][17][18]. Although the RIV method gives only the magnitude of the g factor, it has proven to give it more precisely [12,13,15] than the transient-field method [19,20] in the case of radioactive beam measurements where statistical precision is limited.…”

Section: Introductionmentioning

confidence: 99%

First-excited state g factor of Te136 by the recoil in vacuum method

et al. 2017

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The g factor of the first 2 + state of radioactive 136 Te with two valence protons and two valence neutrons beyond double-magic 132 Sn has been measured by the Recoil in Vacuum (RIV) method. The lifetime of this state is an order of magnitude longer than the lifetimes of excited states recently measured by the RIV method in Sn and Te isotopes, requiring a new evaluation of the free-ion hyperfine interactions and methodology used to determine the g factor. The calibration data are reported and the analysis procedures are described in detail. The resultant g factor has a similar magnitude to the g factors of other nuclei with an equal number of valence protons and neutrons in the major shell. However, an unexpected trend is found in the g factors of the N = 84 isotones, which decrease from 136 Te to 144 Nd. Shell model calculations with interactions derived from the CD Bonn potential show good agreement with the g factors and E2 transition rates of 2 + states around 132 Sn, confirming earlier indications that 132 Sn is a good doubly magic core.

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“…) values of neutron deficient semi-magic Sn isotopes have triggered extensive experimental [2][3][4][5][6][7][8][9][10][11][12] and theoretical [13][14][15][16][17][18][19][20][21] activities, in particular regarding the fundamental roles played by core excitations and the nuclear pairing correlation (or seniority coupling). The study of transition rates in isotopic chains just above Z = 50 may provide further information on the role of core excitations [22,23].…”

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confidence: 99%

Shell-model configuration-interaction description of quadrupole collectivity in Te isotopes

2016

Phys. Rev. C

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We present systematic calculations on the spectroscopy and transition properties of even-even Te isotopes by using the large-scale configuration interaction shell model approach with a realistic interaction. These nuclei are of particular interest since their yrast spectra show a vibrational-like equally-spaced pattern but the few known E2 transitions show anomalous rotational-like behavior, which cannot be reproduced by collective models. Our calculations reproduce well the equallyspaced spectra of those isotopes as well as the constant behavior of the B(E2) values in 114 Te. The calculated B(E2) values for neutron-deficient and heavier Te isotopes show contrasting different behaviors along the yrast line. The B(E2) of light isotopes can exhibit a nearly constant bevavior upto high spins. We show that this is related to the enhanced neutron-proton correlation when approaching N = 50. [13][14][15][16][17][18][19][20][21] activities, in particular regarding the fundamental roles played by core excitations and the nuclear pairing correlation (or seniority coupling). The study of transition rates in isotopic chains just above Z = 50 may provide further information on the role of core excitations [22,23]. The limited number of valence protons and neutrons are not expected to induce any significant quadrupole correlation in this region [24][25][26][27]. The low-lying collective excitations of those nuclei were discussed in terms of quadrupole vibrations [24,28] in relation to the fact that the even-even Te isotopes between N = 56 and 70 show regular equallyspaced yrast spectra (c.f., Fig. 1 in Ref. [24]). If that is the case, the Te isotopes will provide an ideal ground to explore the nature of the elusive nuclear vibration and the residual interactions that leading to that collectivity. However, the available E2 transition strengths along the yrast line in 114,120−124 Te show an anomalous rotationallike behavior, which can not be reproduced by collective models or the interacting boson model [29,30]. Another intriguing phenomenon is the nearly constant behavior of the energies of the 2 + and 4 + states in Te and Xe isotopes and their ratios when approaching N = 50, in contrast to the decreasing behavior when approaching N = 82 [24]. This was analyzed in Ref.[31] based on the quasiparticle random phase approximation approach where an competition between the quadurople-quadrupole correlation and neutron-proton pairing correlation was suggested.An enhanced interplay between neutrons and protons * chongq@kth.se is expected in the 100 Sn region since the protons and neutrons partially occupy the same quantum orbitals near the Fermi level [24,[31][32][33]. In relation to that, there has also been a long effort searching for superallowed alpha decays from those N ∼ Z isotopes [34,35]. The region is also expected to be the endpoint of the astrophysical rapid proton capture (rp) process [36,37]. The octupole correlation may also play a role here (the coupling between the 0h 11/2 and 1d 5/2 orbitals) [26,38,39]. Still, compa...

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Investigation into the semimagic nature of the tin isotopes through electromagnetic moments

Cited by 49 publications

References 49 publications

Z=50core stability inSn110from magnetic-moment and lifetime measurements

Z=50core stability inSn110from magnetic-moment and lifetime measurements

First-excited state g factor of Te136 by the recoil in vacuum method

Shell-model configuration-interaction description of quadrupole collectivity in Te isotopes

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