The 112Cd laboratory: An extension. E0 strengths, multiphonon states and coupled vibrations

Drissi, S.; Tercier, Pierre-Alain; Börner, H. G.; Délz̀e, M.; Hoyler, F.; Judge, Steven; Kern, J.; Mannanal, S.J.; Mouze, G.; Schreckenbach, K.; Vorlet, J.P.; Warr, N.; Williams, A. P.; Ythier, C.

doi:10.1016/s0375-9474(96)00451-4

Cited by 34 publications

(10 citation statements)

References 50 publications

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“…The shape-coexisting intruder states in the 110,112,114 Cd isotopes were well studied in the 1980s and early 1990s, and these early data are summarized in the review by Wood et al [6]. The systematics of the intruder bands in mid-neutron-shell Cd isotopes was expanded using in-beam γ-ray spectroscopy following light-ion fusion-evaporation reactions [343][344][345][346][347][348]. Candidates for the intruder band heads were also suggested in the heavier Cd isotopes, 116−120 Cd, as well as in the lighter isotopes 106,108 Cd (see e.g.…”

Section: Isotopesmentioning

confidence: 99%

An experimental view on shape coexistence in nuclei

Garrett

Zielińska

Clément

2022

Progress in Particle and Nuclear Physics

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Section: Isotopesmentioning

confidence: 99%

An experimental view on shape coexistence in nuclei

Garrett

Zielińska

Clément

2022

Progress in Particle and Nuclear Physics

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“…[17], the (d,p) reaction of Ref. [23] nor via nonselective reactions such as (n,γ) [24] and (n,n γ) [25]. It would be very surprising to identify a new state at such low excitation energy in a well-studied nucleus and so, whilst there is no obvious contaminant identified to account for it, given the wealth of previous data this state has not been assigned as 0 + state in 112 Cd.…”

Section: Are Given In Tablementioning

confidence: 99%

Pairing properties of the double- β emitter Cd116

et al. 2019

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The pairing properties of the neutrinoless double-β decay candidate 116 Cd have been investigated. Measurements of the two-neutron removal reactions on isotopes of 114,116 Cd have been made in order to identify 0 + strength in the residual nuclei up to ≈3 MeV. No significant L = 0 strength has been found in excited states indicating that the Bardeen-Cooper-Schrieffer (BCS) approximation is a reasonable basis to describe the neutrons in the ground state. This approximation avoids complications in calculations of double-β decay matrix elements that use the quasiparticle randomphase approximation (QRPA) techniques. However this is not the case for the protons, where pair vibrations are prevalent and the BCS approximation is no longer valid, complicating the use of traditional QRPA techniques for this system as a whole.

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“…(4), the nuclear matrix element would be an essential factor in the final determination of the neutrino mass from an observation of ECEC(0ν) decay. The nature of the 1871-keV 0 [16,[18][19][20]) as a member of the three-phonon vibrational quintuplet, being at approximately the correct energy and with a previously assigned [9] transition of 558 keV to the 2 + 2 two-phonon level. This assignment, however, was questioned in Ref.…”

mentioning

confidence: 55%

“…A systematic 3% uncertainty on the relative efficiency curve was included that was added in quadrature to the statistical uncertainties of the γ -ray intensities. To determine the branching ratios, the coincidence spectrum was obtained by gating from above the level of [18], and branching ratios from Ref. [15].…”

mentioning

confidence: 99%

Degeneracy at 1871 keV inCd112and implications for neutrinoless double electron capture

et al. 2009

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High-statistics β-decay measurements of112 Ag and 112 In were performed to study the structure of the 112 Cd nucleus. The precise energies of the doublet of levels at 1871 keV, for which the 0 + member has been suggested as a possible daughter state following neutrinoless double electron capture of 112 Sn, were determined to be 1871.137 (72) One of the most pressing issues in subatomic physics today is the question of the nature of the neutrino. The observation of neutrino oscillations [1][2][3] has revealed neutrino mixing and that neutrinos are massive particles or, more precisely, that at least two of the mass eigenstates are nonzero. However, it is still unknown if neutrinos are their own antiparticles (Majorana) or distinct from their antiparticles (Dirac). Furthermore, the oscillation experiments yield information on ( m) 2 , and thus the masses and their orderings remain unknown. Observation of neutrinoless double-β-decay, ββ(0ν), would reveal the Majorana nature of neutrinos, and a measure of the decay rate, λ 0ν , would provide information on the neutrino masses viaThe G 0ν (Q ββ ,Z) factor is the phase-space integral including the Fermi function, M 0ν is the nuclear matrix element, and For ββ(0ν) searches, the typical signature is a peak at Q(ββ) in the sum-β-energy spectrum. However, such searches must strongly suppress the backgrounds from natural radioactivity and cosmic rays. A new class of ββ(0ν) experiments will attempt to surmount these problems; however, the neutrinoless double electron capture, ECEC(0ν), process offers a potentially attractive alternative.The basic physics of the ECEC process was outlined some time ago [4] and included an estimate of the radiative ECEC(0ν) process, which was further refined in Ref. [5]. Following the formation of a virtual capture state with two electron holes in the 1s shell, an internal bremsstrahlung (IB) photon is emitted accompanied by an electron transition from the 2p to the 1s shell. The IB photon is emitted at an energy E IB ofwhere m is the difference in the initial and final atomic masses, E ex is the excitation energy in the daughter nucleus, and E(e i ) is the binding energy of the resulting electron hole in the final state. The normal IB process involves a transition of one of the electrons to an intermediate state from which it is captured, and this process dominates for large Q values. However, for small Q values, where both electrons may be captured leading to a virtual two-electron-hole atom, the process has a resonant enhancement when Q ≡ m − E(1S) − E(2P ) − E ex = Q res ≡ E(2P ) − E(1S); i.e., the radiative IB photon energy matches the K α hypersatellite x-ray energy [6]. In this case,and for favorable cases where Q = Q res , λ 0ν may be enhanced by several orders of magnitude [6].

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The 112Cd laboratory: An extension. E0 strengths, multiphonon states and coupled vibrations

Cited by 34 publications

References 50 publications

An experimental view on shape coexistence in nuclei

An experimental view on shape coexistence in nuclei

Pairing properties of the double- β emitter Cd116

Degeneracy at 1871 keV inCd112and implications for neutrinoless double electron capture

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