Direct Lifetime Measurements of the Excited States in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Ni</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>72</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>

Kolos, K.; Miller, D.; Grzywacz, R.; Iwasaki, H.; Alshudifat, Mohammad; Bazin, D.; Bingham, C. R.; Braunroth, T.; Cerizza, G.; Gade, A.; Lemasson, A.; Liddick, S. N.; Madurga, M.; Morse, C.; Portillo, M.; Rajabali, M. M.; Recchia, F.; Riedinger, L. L.; Voss, P.; Walters, W. B.; Weißhaar, D.; Whitmore, K.; Wimmer, K.; Tostevin, J. A.

doi:10.1103/physrevlett.116.122502

Cited by 18 publications

(19 citation statements)

References 29 publications

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“…This was claimed to indicate a possible weakening of the Z = 28 gap towards 78 Ni. In contrast to this result, recent measurements on 72,74 Ni [28,29] show a reduced B(E2)↑ value for these isotopes, which would corroborate the magic character of the N = 50 and Z = 28 shell gaps. For the N = 50 isotones between Z = 30 and Z = 40, previously reported Coulomb excitation measurements show no indication of a reduction in the N = 50 shell gap at Z = 30 [30,31].…”

Section: Introductioncontrasting

confidence: 52%

“…Recent experimental studies have exploited the use of radioactive ion beams to gain a deeper understanding of the structure of nuclei under extreme isospin conditions. One of the most important results achieved is that the shell closures, which give rise to the magic numbers 2,8,20,28,50,82, and 126 near the line of β stability, change with varying number of protons and neutrons [1]. This so-called shell-evolution has been widely studied, in particular on the neutron-rich side of the nuclear chart.…”

Section: Introductionmentioning

confidence: 99%

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Inelastic scattering of neutron-rich Ni and Zn isotopes off a proton target

Cortés¹,

Doornenbal²,

Dupuis³

et al. 2018

Phys. Rev. C

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Proton inelastic scattering of 72,74 Ni and 76,80 Zn ions at energies around 235 MeV/nucleon was performed at the Radioactive Isotope Beam Factory and studied using γ-ray spectroscopy. Angular integrated cross sections for direct inelastic scattering to the 2 + 1 and 4 + 1 states were measured. The Jeukenne-Lejeune-Mahaux folding model, extended beyond 200 MeV, was used together with neutron and proton densities stemming from quasiparticle random-phase approximation (QRPA) calculations to interpret the experimental cross sections and to infer neutron to proton matrix element ratios. In addition, coupled-channels calculations with a phenomenological potential were used to determine deformation lengths. For the Ni isotopes, correlations favor neutron excitations, thus conserving the Z = 28 gap. A dominance of proton excitation, on the other hand, is observed in the Zn isotopes, pointing to the conservation of the N = 50 gap approaching 78 Ni. These results are in agreement with QRPA and large-scale shell-model calculations.

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Section: Introductioncontrasting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Inelastic scattering of neutron-rich Ni and Zn isotopes off a proton target

Cortés¹,

Doornenbal²,

Dupuis³

et al. 2018

Phys. Rev. C

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“…The B(E2; 4 + 1 → 2 + 1 ) value for 72 Ni was measured to be 50(9) e 2 fm 4 in Ref. [23], which indicates that the 4 + 1 state may be mostly of seniority v = 4 (see, also, Fig. 4 in Ref.…”

mentioning

confidence: 91%

Partial conservation of seniority and its unexpected influence on E2 transitions in g 9/2 nuclei

2017

Physics Letters B

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There exist two uniquely defined v = 4 states in systems within a j = 9/2 subshell, which automatically conserve seniority and do not mix with other states. Here I show that the partial conservation of seniority plays an essential role in our understanding of the electric quadrupole transitions of the semimagic nuclei involving j = 9/2 subshells, including the long-lived 8 + isomer in 94 Ru. The effects of configuration mixing from neighboring subshells on the structure of those unique states are analysed. It is shown that a sharp transition from pure seniority coupling to a significant mixture between the v = 2 and v = 4 states may be induced by the cross-orbital nondiagonal interaction matrix elements. Such strong mixture is essential to explain the observed E2 transition properties of N = 50 isotones 96 Pd and 94 Ru.PACS numbers: 21.10. Tg, 21.60.Cs,27.60.+j One of the greatest challenges in nuclear physics is to understand the regular and simple patterns that emerge from the complex nuclear structure. Among those one can mention the shell structure as a consequence of the strong spin-orbit coupling, which is characterized by nucleons occupying orbitals with different lj values. While the original shell model is mostly built upon independent particle motion, the concept of seniority symmetry has been applied implicitly to account for the strong pairing correlation. The seniority quantum number refers to the minimum number of unpaired particles in a single-j shell for a given configuration |j n ; I with total angular momentum I [1]. The seniority coupling has shown remarkable success in describing the spectroscopy and electromagnetic transition properties of semi-magic nuclei restricted to a single j shell. Of particular interest are nuclei that can be well approximated by the seniority coupling in high j orbitals like 0f 7/2 . For heavier systems, we can mention the neutron-rich 70−78 Ni isotopes [2], the N = 50 and 82 [3] isotones in the 0g 9/2 proton subshell, neutron-rich isotopes 134−140 Sn with in the 1f 7/2 subshell [4] as well as 210−218 Pb in the 1g 9/2 neutron subshell [5].Seniority remains a good quantum number within a subshell when j ≤ 7/2. All states in such systems can be uniquely specified by the total angular momentum I and seniority v. The interaction matrix elements have to satisfy a number of constraints in order to conserve seniority when j > 7/2. For a subshell with j = 9/2, where all but one two-body matrix elements conserve seniority, the condition reads [1, 6-10]where V J = j 2 ; J|V |j 2 ; J denotes a two-body matrix element and J the angular momentum of a two-particle * chongq@kth.se state |j 2 . The symmetry is broken for most effective interactions (see, e.g., Ref.[11]) in subshells with j ≥ 9/2 where the eigenstates would be admixtures of states with different seniorities. For a system with n = 4 identical fermions in a j = 9/2 shell, there are three I = 4 (and also I = 6) states, which may be constructed so that one state has seniority v = 2 and the other two have seniority v =...

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“…To fill at least aportion of this gap, we have been systematically studying the vibrational and electronic spectroscopy as wella sp hotochemistry of cyanoacetylene family members. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] These moleculesa re one of the most abundanti ns pace and have been detected in variousa stronomical objects includingd ark clouds at Heiles's Cloud 2g roup, particularly TCM-1 and -2, [18][19][20][21][22][23][24][25][26][27] the molecular envelopeo ft he star IRC + 10216, [28,29] the galactic core region of Sgr B2, [20,30] cometH ale-Bopp, [31] and Saturn's moon, Titan. [32][33][34] Several literature reportsa lso hint at their possible prebiotic importance.…”

Section: Introductionmentioning

confidence: 99%

Electronic Spectroscopy of Methylcyanodiacetylene (CH₃C₅N)

et al. 2016

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The results of a study devoted to the electronic spectroscopy of gaseous, solid, and cryogenic matrix-isolated methylcyanodiacetylene (CH C N) are reported. UV absorption and optical phosphorescence spectra of the compound are described here for the first time, and the corresponding vibronic assignments are proposed. UV absorption, studied directly or through the excitation of phosphorescence, revealed the B˜ E--X˜ A system, very weak A˜ A -X˜ A bands, and a strong, broad absorption feature, tentatively identified as D˜ E-X˜ A . Spectral measurements were assisted by quantum chemical calculations at the DFT and ab initio (coupled cluster) levels of theory.

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Direct Lifetime Measurements of the Excited States inNi72

Cited by 18 publications

References 29 publications

Inelastic scattering of neutron-rich Ni and Zn isotopes off a proton target

Inelastic scattering of neutron-rich Ni and Zn isotopes off a proton target

Partial conservation of seniority and its unexpected influence on E2 transitions in g 9/2 nuclei

Electronic Spectroscopy of Methylcyanodiacetylene (CH₃C₅N)

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Direct Lifetime Measurements of the Excited States inNi72

Cited by 18 publications

References 29 publications

Inelastic scattering of neutron-rich Ni and Zn isotopes off a proton target

Inelastic scattering of neutron-rich Ni and Zn isotopes off a proton target

Partial conservation of seniority and its unexpected influence on E2 transitions in g 9/2 nuclei

Electronic Spectroscopy of Methylcyanodiacetylene (CH3C5N)

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Product

Resources

About

Electronic Spectroscopy of Methylcyanodiacetylene (CH₃C₅N)