Quadrupole-octupole coupled states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">Cd</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>112</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>populated in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">Cd</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>111</mml:mn></mml:mrow></mml:mmultiscripts><mml:mrow><mml:mo>(</mml:mo><mm

Jamieson, Drew; Garrett, P. E.; Bildstein, V.; Demand, G. A.; Finlay, P.; Green, K. L.; Leach, K. G.; Phillips, A. A.; Sumithrarachchi, C. S.; Svensson, C. E.; Triambak, S.; Ball, G. C.; Hertenberger, R.; Wirth, H.‐F.

doi:10.1103/physrevc.90.054312

Cited by 11 publications

(11 citation statements)

References 31 publications

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“…In this context, it is necessary to mention that for the case of 112 Cd the identification of the 5 − multiplet candidates in terms of E2 transition rates to the 3 − 1 state as well as in terms of energy arguments [64] was certainly not sufficient. These states exhibited strong neutron single-particle character as was shown in a (d, p) reaction leading to excited states of 112 Cd [65]. The 5 − state at 2373 keV was interpreted to have a dominant 3s 1/2 ⊗ 1h 11/2 configuration and to be a rotational-band member of the 3 − 1 one-octupole phonon state which might its explain its enhanced B(E2; 5 − → 3 − 1 ) value.…”

Section: The Other Quintuplet Membersmentioning

confidence: 75%

Shape coexistence and collective low-spin states in Sn112,114 studied with the (p,p′γ
Spieker
¹
,
Petkov
²
,
Литвинова
³

et al. 2018
Phys. Rev. C
16
0
20
1
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Background: The semi-magic Sn (Z = 50) isotopes have been subject to many nuclear-structure studies. Signatures of shape coexistence have been observed and attributed to two-proton-two-hole (2p-2h) excitations across the Z = 50 shell closure. In addition, many low-lying nuclear-structure features have been observed which have effectively constrained theoretical models in the past. One example are so-called quadrupole-octupole coupled states (QOC) caused by the coupling of the collective quadrupole and octupole phonons. Purpose: Proton-scattering experiments followed by the coincident spectroscopy of γ rays have been performed at the Institute for Nuclear Physics of the University of Cologne to excite low-spin states in 112 Sn and 114 Sn, to determine their lifetimes and extract reduced transitions strengths B(ΠL). Methods: The combined spectroscopy setup SONIC@HORUS has been used to detect the scattered protons and the emitted γ rays of excited states in coincidence. The novel (p, p ′ γ) DSA coincidence technique was employed to measure sub-ps nuclear level lifetimes. Results: 74 level lifetimes τ of states with J = 0 − 6 were determined. In addition, branching ratios were deduced which allowed the investigation of the intruder configuration in both nuclei. Here, sd IBM-2 mixing calculations were added which support the coexistence of the two configurations. Furthermore, members of the expected QOC quintuplet are proposed in 114 Sn for the first time. The 1 − candidate in 114 Sn fits perfectly into the systematics observed for the other stable Sn isotopes. Conclusions: The E2 transition strengths observed for the low-spin members of the so-called intruder band support the existence of shape coexistence in 112,114 Sn. The collectivity in this configuration is comparable to the one observed in the Pd nuclei, i.e. the 0p-4h nuclei. Strong mixing between the 0 + states of the normal and intruder configuration might be observed in 114 Sn. The general existence of QOC states in 112,114 Sn is supported by the observation of QOC candidates with J = 1.

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Section: The Other Quintuplet Membersmentioning

confidence: 75%

Shape coexistence and collective low-spin states in Sn112,114 studied with the (p,p′γ
Spieker
¹
,
Petkov
²
,
Литвинова
³

et al. 2018
Phys. Rev. C
16
0
20
1
View full text Add to dashboard Cite

show abstract

“…[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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“…The 5 − level at 2373 keV, assigned as a member of the QOC quintuplet, is the second-strongest excitation observed below 3 MeV in excitation energy, and is assigned as having a predominately s 1/2 ⊗h 11/2 character. The level at 2818 is the 6 − member of the s 1/2 ⊗h 11/2 configuration, and the strongest populated level observed in the entire spectrum [50]. Reprinted figure with permission from [50].…”

Section: The CD Isotopesmentioning

confidence: 99%

“…The level at 2818 is the 6 − member of the s 1/2 ⊗h 11/2 configuration, and the strongest populated level observed in the entire spectrum [50]. Reprinted figure with permission from [50]. Copyright (2014) by the American Physical Society.…”

Section: The CD Isotopesmentioning

confidence: 99%

Critical insights into nuclear collectivity from complementary nuclear spectroscopic methods

2018

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Low-energy collectivity of nuclei has been, and is being, characterized in a critical manner using data from a variety of spectroscopic methods, including Coulomb excitation, β decay, inelastic scattering of charged and uncharged particles, transfer reactions, etc. In addition to level energies and spins, transition multipolarities and intensities, lifetimes, and nuclear moments are available. The totality of information from these probes must be considered in achieving an accurate vision of the excitations in nuclei and determining the applicability of nuclear models. From these data, major changes in our view of low-energy collectivity in nuclei have emerged; most notable is the demise of the long-held view of low-energy quadrupole collectivity near closed shells as due to vibrations about a spherical equilibrium shape. In this contribution, we focus on the basic predictions of the spherical harmonic vibrator limit of the Bohr Hamiltonian. Properties such as B(E2) values, quadrupole moments, E0 strengths, etc are outlined. Using the predicted properties as a guide, evidence is cited for and against the existence of vibrational states, and especially multi-phonon states, in nuclei that are, or historically were considered to be, spherical or have a nearly spherical shape in their ground state. It is found that very few of the nuclei that were identified in the last major survey seeking nearly spherical harmonic vibrators satisfy the more stringent guidelines presented herein. Details of these fundamental shifts in our view of low-energy collectivity in nuclei are presented.

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Quadrupole-octupole coupled states inCd112populated in theCd111(

Cited by 11 publications

References 31 publications

Shape coexistence and collective low-spin states in Sn112,114 studied with the (p,p′γ
Spieker
¹
,
Petkov
²
,
Литвинова
³

et al. 2018
Phys. Rev. C
16
0
20
1
View full text Add to dashboard Cite

Shape coexistence and collective low-spin states in Sn112,114 studied with the (p,p′γ
Spieker
¹
,
Petkov
²
,
Литвинова
³

et al. 2018
Phys. Rev. C
16
0
20
1
View full text Add to dashboard Cite

Pairing properties of the double- β emitter Cd116

Critical insights into nuclear collectivity from complementary nuclear spectroscopic methods

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Quadrupole-octupole coupled states inCd112populated in theCd111(

Cited by 11 publications

References 31 publications

Shape coexistence and collective low-spin states in Sn112,114 studied with the (p,p′γSpieker1, Petkov2, Литвинова3 et al. 2018Phys. Rev. C160201View full textAdd to dashboardCite

Shape coexistence and collective low-spin states in Sn112,114 studied with the (p,p′γSpieker1, Petkov2, Литвинова3 et al. 2018Phys. Rev. C160201View full textAdd to dashboardCite

Pairing properties of the double- β emitter Cd116

Critical insights into nuclear collectivity from complementary nuclear spectroscopic methods

Contact Info

Product

Resources

About

Shape coexistence and collective low-spin states in Sn112,114 studied with the (p,p′γ
Spieker
¹
,
Petkov
²
,
Литвинова
³

et al. 2018
Phys. Rev. C
16
0
20
1
View full text Add to dashboard Cite

Shape coexistence and collective low-spin states in Sn112,114 studied with the (p,p′γ
Spieker
¹
,
Petkov
²
,
Литвинова
³

et al. 2018
Phys. Rev. C
16
0
20
1
View full text Add to dashboard Cite