First observation of excited states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Hg</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>172</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Cederwall, B.; Hadinia, B.; Andgren, K.; Baeck, T.; Johnson, A.; Khaplanov, A.; Wyss, R.; Grahn, T.; Greenlees, P. T.; Jakobsson, U.; Jones, P.; Julin, R.; Juutinen, S.; Ketelhut, S.; Leino, M.; Nyman, May; Peura, P.; Rahkila, P.

doi:10.1103/physrevc.79.064315

Cited by 15 publications

(13 citation statements)

References 40 publications

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“…The deformation is also consistent with predictions of TRS calculations presented in Ref. [11], in which the authors state that for the nuclei 172,174,176 Hg the near-oblate ground state evolves steadily toward a more spherical shape with decreasing N as the N = 82 closed shell is approached. Second, no prolate minimum is seen in the TRS calculations with β 2 ≈ 0.25 for 172-176 Hg, but for increasing neutron number a well-deformed minimum (β 2 ≈ 0.35) starts to develop and is first observed in 176 Hg.…”

Section: Discussionsupporting

confidence: 90%

“…To date, the most neutron-deficient isotope of mercury for which transition probabilities are known is 180 Hg. The even-mass neighbor 178 Hg is predicted to be the start point of a shape transition by several theoretical models such as total Routhian surface (TRS) calculations [11], mean-field approaches, and the interacting boson model (IBM) with configuration mixing [12]. Therefore, to address the question of shape evolution toward even more neutrondeficient Hg isotopes, lifetime measurements of excited states in 178 Hg have been performed in the present work.…”

Section: Introductionmentioning

confidence: 99%

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Shape coexistence in Hg178

Müller-Gatermann¹,

Dewald²,

Fransen³

et al. 2019

Phys. Rev. C

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Lifetime measurements of excited states in 178 Hg have been performed using the 103 Rh(78 Kr, p2n) reaction at a beam energy of 354 MeV. The recoil-decay tagging (RDT) technique was applied to select the 178 Hg nuclei and associate the prompt γ rays with the correlated characteristic ground-state α decay. Lifetimes of the four lowest yrast states of 178 Hg have been determined using the recoil distance Doppler-shift (RDDS) method. The experimental data are compared to theoretical predictions with focus on shape coexistence. The results confirm the shift of the deformed prolate structures to higher lying states but also indicate their increasing deformation with decreasing neutron number.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Shape coexistence in Hg178

Müller-Gatermann¹,

Dewald²,

Fransen³

et al. 2019

Phys. Rev. C

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“…Some of the data points are slightly offset from their actual A value to maintain the clarity of presentation. related to the mixing of the prolate intruder structure with the spherical vibrational structure, which has been identified in 172 Hg [26].…”

Section: A Yrast States In 180 Hg and 182 Hgmentioning

confidence: 99%

Evolution of collectivity inHg180andHg182

Grahn¹,

Petts²,

Scheck³

et al. 2009

Phys. Rev. C

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Lifetimes of yrast states in 180 Hg up to the 8 + state and of the 9 − state have been extracted from recoil-decay tagged γ -ray spectra by using the recoil distance Doppler-shift method. In addition, lifetimes of yrast states up to the 10 + state in 182 Hg have been extracted from recoil-gated γ γ -coincidence spectra. The present study addresses the evolution of collectivity of two competing shapes in neutron-deficient Hg nuclei as a function of A and the configuration mixing at low spin.

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“…The yrast band structure for mass A=172 to A=176 have been studied using the highly-selective recoil decay tagging (RDT) technique [9,122,123]. Carpenter et al [124] studied both the A=176 and A=178 Hg nuclei.…”

Section: The Experimental Data In the Even-even Hg Nucleimentioning

confidence: 99%

Nuclear shape coexistence: A study of the even-even Hg isotopes using the interacting boson model with configuration mixing

2014

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Background:The Po, Pb, Hg, and Pt region is known for the presence of coexisting structures that correspond to different particle-hole configurations in the shell model language or equivalently to nuclear shapes with different deformation. Purpose: We intend to study the configuration mixing phenomenon in the Hg isotopes and to understand how different observables are influenced by it. Method: We study in detail a long chain of mercury isotopes, Hg, using the interacting boson model with configuration mixing. The parameters of the Hamiltonians are fixed through a least-squares fit to the known energies and absolute B(E2) transition rates of states up to 3 MeV. Results: We obtained the IBM-CM Hamiltonians and we calculate excitation energies, B(E2)'s, quadrupole shape invariants, wave functions, isotopic shifts, and mean-field energy surfaces. Conclusions:We obtain a fairly good agreement with the experimental data for all the studied observables and we conclude that the Hamiltonian and the states we obtain constitute a good approximation to the Hg isotopes.

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First observation of excited states inHg172

Cited by 15 publications

References 40 publications

Shape coexistence in Hg178

Shape coexistence in Hg178

Evolution of collectivity inHg180andHg182

Nuclear shape coexistence: A study of the even-even Hg isotopes using the interacting boson model with configuration mixing

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