Recoil-beta tagging: A novel technique for studying proton-drip-line nuclei

Steer, A. N.; Jenkins, D. G.; Glover, R.; Singh, B. S. Nara; Pattabiraman, Nagarajan; Wadsworth, R.; Eeckhaudt, S.; Grahn, T.; Greenlees, P. T.; Jones, P.; Julin, R.; Juutinen, S.; Leino, M.; Nyman, M.; Pakarinen, J.; Rahkila, P.; Sarén, J.; Scholey, C.; Sorri, J.; Uusitalo, J.; Butler, P. A.; Darby, I. G.; Herzberg, R.‐D.; Joss, D. T.; Page, R. D.; Thomson, James A.; Lemmon, R. C.; Simpson, John; Blank, Β.

doi:10.1016/j.nima.2006.06.034

Cited by 21 publications

(21 citation statements)

References 24 publications

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“…1 method [20]. The spectrum of states below 1.5 MeV reported is the same as those of Rudolph et al [18], with the addition of (presumed T = 0) states at 1161 keV and 979 keV, assigned as 2 + and 1 + respectively -see Fig.…”

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confidence: 58%

Triplet energy differences and the low lying structure ofGa62

Henry¹,

Bentley²,

Clark³

et al. 2015

Phys. Rev. C

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confidence: 58%

Triplet energy differences and the low lying structure ofGa62

Henry¹,

Bentley²,

Clark³

et al. 2015

Phys. Rev. C

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“…Sensitive techniques are needed to discriminate the exotic nuclei of interest. In the present work, we report data on excited states in 74 Sr for the first time.To probe excited states in 74 Sr, the recoil-β tagging (RBT) technique [6,7] was employed. Instead of using a discrete decay energy such as a characteristic α or proton decay as a tag, RBT exploits the special characteristics of some β decays at and beyond the line of N = Z, namely, their short half-life and high endpoint energy, stemming from their Fermi superallowed character.…”

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confidence: 99%

“…Instead of using a discrete decay energy such as a characteristic α or proton decay as a tag, RBT exploits the special characteristics of some β decays at and beyond the line of N = Z, namely, their short half-life and high endpoint energy, stemming from their Fermi superallowed character. The RBT technique was initially demonstrated for the case of 74 Rb where excited states were well known [6]. It was later used to identify excited states in the N = Z nucleus 78 Y for the first time [8].…”

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confidence: 99%

Spectroscopy on the proton drip-line: Probing the structure dependence of isospin nonconserving interactions

Henderson¹,

Jenkins²,

Kaneko³

et al. 2014

Phys. Rev. C

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The recoil-β tagging technique was used to identify transitions associated with the decay of the 2 + and, tentatively, the 4 + excited states in 74 Sr. Combining these results with published data for the A = 74 isobars, triplet energy differences (TEDs) have been extracted, the heaviest case for which these values have been evaluated. State-of-the-art shell-model calculations using the JUN45 interaction and incorporating a J = 0 isospin nonconserving (INC) interaction with an isotensor strength of 100 keV can reproduce the trend in the TED data, with particularly good agreement for the 2 + state. This agreement for the TED data taken together with the fact that agreement has also been shown between shell-model calculations with the same strength of INC interaction in the f 7/2 shell and recently for A = 66 strongly suggests that such an interaction exists throughout the nuclear chart and cannot have a strong dependence on details of nuclear structure such as which nuclear orbitals are occupied. It also supports the hypothesis that only a J = 0 component of the INC interaction need be included to explain the observed TEDs. Isospin symmetry is a central concept in nuclear physics, based on the idea that the proton and neutron are two isospin states of a single object, the nucleon. This would imply an identical pattern of excited states across a T = 1 isospin triplet. These symmetries are broken due to a number of nuclear structure effects, most importantly the fact that the proton carries an electric charge while the neutron does not. When exploring such breakdown of symmetries, it is instructive for the study of isospin triplets, to evaluate triplet energy differences (TEDs) as a function of spin J defined bySuch isotensor energy differences are essentially independent of single-particle effects, which makes them particularly simple. Since contributions involving Coulomb effects are readily calculable, TEDs are particularly sensitive to additional terms such as isospin nonconserving (INC) components. It has been shown that such a component is necessary to reproduce experimental mirror-energy differences (MEDs) in the f 7/2 shell [1]. Indeed, recent work identifying the (4 + 1 ) and (6 + 1 ) excited states in the N = Z − 2 nucleus 66 Se [2] has allowed the evaluation of the TEDs for A = 66, the first case above the 56 Ni closed shell; and it appears that an INC term is also mandatory in reproducing the TED. Nucleon-nucleon scattering data have previously been used to infer the INC component to the nuclear interaction, the isotensor component of which is consistent with that previously observed in the f 7/2 orbital [3]. The measurement of such a component in-medium is of considerable interest, and it is not yet clear whether the INC component arising from energy-difference measurements is indeed the same as that determined from scattering data. It is of high interest to extend such studies to higher masses, where the structure of the low-spin states involved is very different, evolving from dominance by fp orbitals...

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“…Radioactive beam Coulomb excitation is a promising approach for their studies [7]. In this Letter, we discuss a technique recently developed by us for isolating nuclei in this region through recoil beta tagging [8], and have used it to explore Coulomb energy differences (CED) between isospin T = 1 states in odd-odd N = Z nuclei (T z = (N − Z)/2=0) and their analog states in their even-even neighbors. The CED is defined as…”

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confidence: 99%

“…[13,14] were confirmed, and, in particular, the 575 and 478 keV γ rays establish the energy of the 4 + , 2 + states to be 1053 and 478 keV, respectively. In a recent publication, we focus on the technique in detail and explore strategies for optimising the efficiency and cleanliness of the correlations [8]. The use of a 36 Ar-induced reaction with a beam energy around the Coulomb barrier, resulted in greater feeding of low-lying non-yrast states.…”

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confidence: 99%