Mapping the proton drip line up to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mn>70</mml:mn><mml:mn /></mml:math>

Ormand, W. E.

doi:10.1103/physrevc.55.2407

Cited by 146 publications

(125 citation statements)

References 32 publications

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“…Taking into account the small correction for the recoil of the daughter nucleus yielded the total decay energy for this event of 1.26 (12) MeV. This value is in fair agreement with theoretical predictions for the Q 2p value of 48 Ni which are 1.36(13) MeV [2], 1.29(33) MeV [3], and 1.35(6) MeV [4].…”

supporting

confidence: 74%

“…Since the OTPC is not sensitive to positrons, no trace of such decay would be recorded. However, the β + decay daughter nucleus 48 Co is predicted to be proton unbound by more than 800 keV [2][3][4]. Moreover, the assumption of the mirror symmetry and the level scheme of 48 Sc [25] leads to the prediction that neither the ground state of 48 Co, expected to be 6 + , nor any low lying excited state could be fed by β decay of 48 Ni.…”

mentioning

confidence: 99%

“…For medium mass nuclei, the best method was found to rely on the isobaric multiplet mass equation (IMME) combined with the experimentally measured mass of the neutron-rich member of the multiplet. Various implementations of this method [2][3][4] yielded three nuclei as the best candidates for the 2p radioactivity: 45 Fe, 48 Ni, and 54 Zn. Indeed, 45 Fe was the first case where the 2p emission was experimentally established in 2002 [5,6].…”

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confidence: 99%

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First observation of two-proton radioactivity inNi48

et al. 2011

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First observation of two-proton radioactivity inNi48

et al. 2011

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“…Then two cases are possible. Firstly, the decay may proceed via a three-body desintegration as observed for 12 O [9] or 6 Be [10]. Secondly, the nuclear state may decay via 2 a strong angular and energy correlation between the two resulting protons may be expected.…”

Section: Introductionmentioning

confidence: 99%

“…In the A ≃ 50 mass region, a specific interest arises for decay studies since several nuclei in this region are candidates for this correlated emission of two protons from the ground state: 39 Ti, 42 Cr, 45 Fe, 48,49 Ni [11,12,13]. In addition, full shell-model calculations in the f p-shell are now possible [14] and may allow for a valuable comparison with experimental results to improve our understanding of nuclear structure in this region and to deduce effective interactions.…”

Section: Introductionmentioning

confidence: 99%

Decay of proton-rich nuclei between 39Ti and 49Ni

et al. 2001

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Abstract. Decay studies of very neutron-deficient nuclei ranging from 39 Ti to 49 Ni have been performed during a projectile fragmentation experiment at the GANIL/LISE3 separator. For all nuclei studied in this work, 39,40 Ti, 42,43 Cr, 46 Mn, 45,46,47 Fe and 49 Ni, half-lives and decay spectra have been measured. In a few cases, γ coincidence measurements helped to successfully identify the initial and final states of transitions. In these cases, partial decay scheme are proposed. For the most exotic isotopes, 39 Ti, 42 Cr, 45 Fe and 49 Ni, which are candidates for two-proton radioactivity from the ground state, no clear evidence of this process is seen in our spectra and we conclude rather on a delayed particle decay.

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First observation of 54Zn and its decay by two-proton emission

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Adimi

Bey

et al. 2005

The 4th International Conference on Exotic Nuclei and Atomic Masses

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The nucleus 54 Zn has been observed for the first time in an experiment at the SISSI/LISE3 facility of GANIL in the quasi-fragmentation of a 58 Ni beam at 74.5 MeV/nucleon in a nat Ni target. The fragments were analysed by means of the ALPHA-LISE3 separator and implanted in a silicon-strip detector where correlations in space and time between implantation and subsequent decay events allowed us to generate almost background free decay spectra for about 25 different nuclei at the same time. Eight 54 Zn implantation events were observed. From the correlated decay events, the half-life of 54 Zn is determined to be 3.2 +1.8 −0.8 ms. Seven of the eight implantations are followed by two-proton emission with a decay energy of 1.48(2) MeV. The decay energy and the partial halflife are compared to model predictions and allow for a test of these two-proton decay models.PACS numbers: 23.50.+z, 23.90.+w, 21.10.-k, 27.40.+z Our understanding of nuclear structure is mainly based on results obtained with nuclei close to the line of stability. These studies allowed for understanding of the basic structure of the strong interaction which governs the interplay between neutrons and protons in an atomic nucleus. However, these nuclei close to stability cover only a very small range in isospin, i.e. their proton-toneutron ratio is rather similar. With the advent of machines to produce radioactive nuclei, these basic concepts can now be tested with more and more exotic nuclei having a strong imbalance of neutrons and protons.With these exotic nuclei being much further away from stability, also new phenomena appeared. For nuclei beyond the proton drip line, where the strong force can no longer bind all protons, one-and two-proton (2p) radioactivity was predicted more than 40 years ago by Goldanskii [1]. For odd-Z nuclei, one-proton radioactivity was proposed to occur, whereas for medium-and heavy-mass even-Z nuclei the nuclear pairing energy renders one-proton emission impossible. In this case, twoproton emission is to be expected.One-proton radioactivity was observed for the first time about 20 years ago by Hofmann et al. [2]. Twoproton radioactivity was sought for many years without success. This research field experienced a strong boost with the advent of high-intensity projectilefragmentation facilities. At these facilities, experimentalists could for the first time reach the most promising candidates for two-proton radioactivity. According to recent theoretical predictions, proton drip-line nuclei in the A=40-55 region were identified as the most promising candidates [3][4][5]. The recent observation of two-proton radioactivity of 45 Fe [6,7] confirmed these predictions nicely. In other experiments, less promising candidates like 42 Cr, and 49 Ni could be shown to decay by β-delayed processes [8]. Beyond 45 Fe, 48 Ni and 54 Zn were regarded as possible candidates to exhibit two-proton radioactivity. In the present letter, we report on the first observation of 54 Zn and its decay by two-proton radioactivity. 54 Zn was produced by...

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Mapping the proton drip line up toA=70

Cited by 146 publications

References 32 publications

First observation of two-proton radioactivity inNi48

First observation of two-proton radioactivity inNi48

Decay of proton-rich nuclei between 39Ti and 49Ni

First observation of 54Zn and its decay by two-proton emission

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