Multiparticle emission in the decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">Ar</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>31</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Koldste, G. T.; Blank, Β.; Borge, María José García; Briz, J. A.; Carmona-Gallardo, M.; Fraile, L. M.; Fynbo, H. O. U.; Giovinazzo, J.; Grann, B. D.; Johansen, Jacob; Jokinen, A.; Jonson, B.; Kurturkian-Nieto, T.; Kusk, J. H.; Nilsson, T.; Perea, Á.; Pesudo, V.; Picado, E.; Riisager, K.; Saastamoinen, A.; Tengblad, O.; Thomas, J.C.; Walle, J. Van de

doi:10.1103/physrevc.89.064315

Cited by 22 publications

(30 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, emission of β-delayed particles (protons, neutrons, or α particles) becomes more and more likely. Close to the proton drip line, β-delayed one-, two-, and (in particular recently) three-proton emission has been observed [1][2][3][4][5][6].In all these cases, the excess protons are still sufficiently bound that direct particle emission is not possible.However, when moving further away from the line of stability, the protons are no longer bound by the strong nuclear force and the proton drip line is crossed. For slightly negative proton separation energies S p or S 2p , β þ decay can still compete with direct one-or two-proton emission; however, with separation energies typically below −1 MeV, one-and two-proton emission dominates for odd-and even-Z elements, respectively.…”

mentioning

confidence: 94%

Two-Proton Radioactivity ofKr67

Goigoux¹,

Ascher²,

Blank³

et al. 2016

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

In an experiment with the BigRIPS separator at the RIKEN Nishina Center, we observed two-proton (2p) emission from 67 Kr. At the same time, no evidence for 2p emission of 59 Ge and 63 Se, two other potential candidates for this exotic radioactivity, could be observed. This observation is in line with Q value predictions which pointed to 67 Kr as being the best new candidate among the three for two-proton radioactivity. 67 Kr is only the fourth 2p ground-state emitter to be observed with a half-life of the order of a few milliseconds. The decay energy was determined to be 1690(17) keV, the 2p emission branching ratio is 37(14)%, and the half-life of 67 Kr is 7.4(30) ms. DOI: 10.1103/PhysRevLett.117.162501 Close to the valley of β stability, nuclear β decay, which is often associated with γ-ray emission, is the only decay mode possible. When moving closer to the limits of stability in both directions, the available decay energy, the Q value, increases at the same time as the binding energy of the excess particle decreases. Therefore, emission of β-delayed particles (protons, neutrons, or α particles) becomes more and more likely. Close to the proton drip line, β-delayed one-, two-, and (in particular recently) three-proton emission has been observed [1][2][3][4][5][6].In all these cases, the excess protons are still sufficiently bound that direct particle emission is not possible.However, when moving further away from the line of stability, the protons are no longer bound by the strong nuclear force and the proton drip line is crossed. For slightly negative proton separation energies S p or S 2p , β þ decay can still compete with direct one-or two-proton emission; however, with separation energies typically below −1 MeV, one-and two-proton emission dominates for odd-and even-Z elements, respectively. We underline here that for 2p radioactivity, the one-proton separation energy has to be positive.For odd-proton-number (odd-Z) elements, one-proton radioactivity is a well-established decay mode and is PRL 117,

show abstract

mentioning

confidence: 94%

Two-Proton Radioactivity ofKr67

Goigoux¹,

Ascher²,

Blank³

et al. 2016

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

show abstract

“…[33] within 1.6 combined standard deviations. Given the slight tension between the value based on the βp measurement [31] and the other two values, a new measurement of 31 Ar beta decay [51,52] with high sensitivity to low-energy protons would be an interesting study.…”

Section: Prediction Of 31 CL First Excited State Energymentioning

confidence: 99%

Isobaric multiplet mass equation in theA=31,T=3/2quartets

Bennett¹,

Wrede²,

Brown³

et al. 2016

Phys. Rev. C

View full text Add to dashboard Cite

Background: The observed mass excesses of analog nuclear states with the same mass number A and isospin T can be used to test the isobaric multiplet mass equation (IMME), which has, in most cases, been validated to a high degree of precision. A recent measurement (Kankainen et al., Phys. Rev. C 93 041304(R) (2016)) of the ground-state mass of 31 Cl led to a substantial breakdown of the IMME for the lowest A = 31, T = 3/2 quartet. The second-lowest A = 31, T = 3/2 quartet is not complete, due to uncertainties associated with the identity of the 31 S member state.Purpose: To populate the two lowest T = 3/2 states in 31 S and use the data to investigate the influence of isospin mixing on tests of the IMME in the two lowest A = 31, T = 3/2 quartets.Methods: Using a fast 31 Cl beam implanted into a plastic scintillator and a high-purity Ge γ-ray detection array, γ rays from the 31 Cl(βγ) 31 S sequence were measured. Shell-model calculations using USDB and the recently-developed USDE interactions were performed for comparison.Results: Isospin mixing between the 31 S isobaric analog state (IAS) at 6279.0(6) keV and a nearby state at 6390.2(7) keV was observed. The second T = 3/2 state in 31 S was observed at Ex = 7050.0(8) keV. Calculations using both USDB and USDE predict a triplet of isospin-mixed states, including the lowest T = 3/2 state in 31 P, mirroring the observed mixing in 31 S, and two isospin-mixed triplets including the second-lowest T = 3/2 states in both 31 S and 31 P.Conclusions: Isospin mixing in 31 S does not by itself explain the IMME breakdown in the lowest quartet, but it likely points to similar isospin mixing in the mirror nucleus 31 P, which would result in a perturbation of the 31 P IAS energy. USDB and USDE calculations both predict candidate 31 P states responsible for the mixing in the energy region slightly above Ex = 6400 keV. The second quartet has been completed thanks to the identification of the second 31 S T = 3/2 state, and the IMME is validated in this quartet.

show abstract

“…In the case of 31 Ar, (Q EC = 18.38(10) MeV, S p = 282.8(44) keV, T 1 2 = 15.1(3) ms [2]), many decay channels are open: βγ, βp, βpγ, β2p, β2pγ, β3p and perhaps also β3pγ. The nucleus 31 Ar has been studied in previous experiments at GANIL (1987 [3], 1991 [4], 1992 [5]) and at ISOLDE (1988 [6], 1995 [7,8], 1996/1997 [9][10][11], 2009 [2,12,13]). However, the β3p branch has been observed only with limited statistics and β3pγ remains unobserved.…”

Section: Introductionmentioning

confidence: 99%

Multi-particle Emission from ${^{31}}$Ar at ISOLDE

Marroquín¹,

Borge²,

Ciemny³

et al. 2016

Acta Phys. Pol. B

Self Cite

View full text Add to dashboard Cite

A multi-particle decay experiment was successfully performed at the ISOLDE Decay Station. In this new permanent station, devoted to β-decay studies, the novel MAGISOL Si-Plugin Chamber was installed to study the exotic decay modes of the proton drip-line nucleus 31 Ar. The motivation was to search for β3p and β3pγ channels, as well as to provide information on resonances in 30 S and 29 P relevant for the astrophysical rp-process. Description of the experimental set-up and preliminary results are presented.

show abstract

Multiparticle emission in the decay ofAr31

Cited by 22 publications

References 31 publications

Two-Proton Radioactivity ofKr67

Two-Proton Radioactivity ofKr67

Isobaric multiplet mass equation in theA=31,T=3/2quartets

Multi-particle Emission from ${^{31}}$Ar at ISOLDE

Contact Info

Product

Resources

About