Inelastic neutron scattering studies of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Se</mml:mi><mml:mprescripts /><mml:none /><mml:mn>76</mml:mn></mml:mmultiscripts></mml:math>

Mukhopadhyay, S.; Crider, B. P.; Brown, B. A.; Chakraborty, Amit; Kumar, Ajay; McEllistrem, M. T.; Peters, E. E.; Prados-Estévez, F. M.; Yates, S. W.

doi:10.1103/physrevc.99.014313

Cited by 16 publications

(20 citation statements)

References 28 publications

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“…These studies have provided critical information for comparison with theory, especially on contributions to the wavefunctions from competing single-particle orbitals. In much the same way, recent inelastic neutron scattering measurements have provided spectroscopic information on the structure of low-lying states [6,7], with implications on the kinematic phase space available for the 0νββ process. However, all these studies lack the required level of sensitivity to collective degrees of freedom which have been shown to significantly impact the calculated NMEs.…”

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confidence: 97%

Evidence for Rigid Triaxial Deformation in Ge76 from a Model-Independent Analysis

et al. 2019

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An extensive, model-independent analysis of the nature of triaxial deformation in 76 Ge, a candidate for neutrinoless double-beta (0νββ) decay, was carried out following multi-step Coulomb excitation. Shape parameters deduced on the basis of a rotational-invariant sum-rule analysis provided considerable insight into the underlying collectivity of the ground-state and γ bands. Both sequences were determined to be characterized by the same β and γ deformation parameter values. In addition, compelling evidence for low-spin, rigid triaxial deformation in 76 Ge was obtained for the first time from the analysis of the statistical fluctuations of the quadrupole asymmetry deduced from the measured E2 matrix elements. These newly determined shape parameters are important input and constraints for calculations aimed at providing, with suitable accuracy, the nuclear matrix elements relevant to 0νββ.

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confidence: 97%

Evidence for Rigid Triaxial Deformation in Ge76 from a Model-Independent Analysis

et al. 2019

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“…The methods used in our (n , n γ) studies of 74 Ge are similar to those described in detail in our studies of 76 Ge [3] and 76 Se [6]; however, some comments are in order about the inelastic neutron scattering reaction as employed in our laboratory. As neutrons do not experience a Coulomb barrier, by varying the incident neutron energy the nucleus can be selectively excited to any energy.…”

Section: Methodsmentioning

confidence: 99%

“…At UKAL, we have performed γ-ray spectroscopic studies following inelastic neutron scattering from 76 Ge [3], which is widely regarded as one of the best candidates for the observation of 0νββ and is the focus of two large-scale searches [4,5], and 76 Se, its double-beta decay daughter [6]. Configuration interaction shell-model calculations in the j j44 model space (see the Appendix of Ref.…”

Section: Introductionmentioning

confidence: 99%

Relevance of the Nuclear Structure of the Stable Ge Isotopes to the Neutrino-less Double-Beta Decay of ⁷⁶Ge

et al. 2020

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Gamma-ray detection following the inelastic neutron scattering reaction on isotopically enriched material was used to study the nuclear structure of 74Ge. From these measurements, low-lying, low-spin excited states were characterized, new states and their decays were identified, level lifetimes were measured with the Doppler-shift attenuation method (DSAM), multipole mixing ratios were established, and transition probabilities were determined. New structural features in 74Ge were identified, and the reanalysis of older 76Ge data led to the placement of the 2+ member of the intruder band. In addition, a number of previously placed states in 74Ge were shown not to exist. A procedure for future work, which will lead to meaningful data for constraining calculations of the neutrinoless double-beta decay matrix element, is suggested.

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“…It is relevant to note that the shell-model calculations give a reasonable description of the E2 transition strengths in 76 Ge and 76 Se [50,51] using standard effective charges for the region [10]. A firm statement on whether or not there is additional collectivity in the 2 + 1 states of these nuclei not captured by the shell-model calculations, as suggested by Gürdal et al [7], requires that the absolute values of the g factors be measured accurately and with some precision.…”

Section: B Shell-model Calculationsmentioning

confidence: 96%

“…This estimate can be made despite uncertainties in the absolute magnitude of the g factors. Neutron scattering studies of 76 Ge [50] and 76 Se [51] have allowed the band structures of these isobars to be observed, and low-energy shape coexistence to be identified in 76 Se. Overall, a good description of the low-lying level structures was obtained by the same shell-model calculations as discussed here.…”

Section: B Shell-model Calculationsmentioning

confidence: 99%

First-excited state g factors in the stable, even Ge and Se isotopes

et al. 2019

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Transient-field g-factor measurements in inverse kinematics were performed for the first-excited states of the stable, even isotopes of Ge and Se. The g factors of 74 Ge and 74 Se were measured simultaneously using a cocktail beam, which eliminates most possible sources of systematic error in a relative g-factor measurement. The results are g( 74 Se)/g( 74 Ge) = 1.34 (7), g( 70 Ge)/g( 74 Ge) = 1.16(15), g( 72 Ge)/g( 74 Ge) = 0.92(13), g( 76 Ge)/g( 74 Ge) = 0.88(5), g( 76 Se)/g( 74 Se) = 0.96 (7), g( 78 Se)/g( 74 Se) = 0.82(5), g( 80 Se)/g( 74 Se) = 0.99(7) and g( 82 Se)/g( 74 Se) = 1.19(6). The measured g-factor ratios are in agreement with ratios from previous measurements, despite considerable variation in previous reported absolute values. The absolute values of the g factors remain uncertain, however the Rutgers parametrization was used to set the transient-field strength and then compare the experimental g factors with shell-model calculations based on the JUN45 and jj44b interactions. Modest agreement was found between experiment and theory for both interactions. The shell model calculations indicate that the g(2 + 1 ) values and trends are determined largely by the balance of the spin carried by orbital motion of the protons.

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Inelastic neutron scattering studies of Se76

Cited by 16 publications

References 28 publications

Evidence for Rigid Triaxial Deformation in Ge76 from a Model-Independent Analysis

Evidence for Rigid Triaxial Deformation in Ge76 from a Model-Independent Analysis

Relevance of the Nuclear Structure of the Stable Ge Isotopes to the Neutrino-less Double-Beta Decay of ⁷⁶Ge

First-excited state g factors in the stable, even Ge and Se isotopes

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Inelastic neutron scattering studies of Se76

Cited by 16 publications

References 28 publications

Evidence for Rigid Triaxial Deformation in Ge76 from a Model-Independent Analysis

Evidence for Rigid Triaxial Deformation in Ge76 from a Model-Independent Analysis

Relevance of the Nuclear Structure of the Stable Ge Isotopes to the Neutrino-less Double-Beta Decay of 76Ge

First-excited state g factors in the stable, even Ge and Se isotopes

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Relevance of the Nuclear Structure of the Stable Ge Isotopes to the Neutrino-less Double-Beta Decay of ⁷⁶Ge