Observation of Doppler broadening in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-delayed proton-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>γ</mml:mi></mml:math>decay

Schwartz, Sanford; Wrede, C.; Bennett, Michael B.; Liddick, S. N.; Pérez–Loureiro, D.; Bowe, A.; Chen, A. A.; Chipps, K. A.; Cooper, Natalie; Irvine, D.; McNeice, E.; Montes, F.; Naqvi, F.; Ortez, R.; Pain, S. D.; Pereira, J.; Prokop, C. J.; Quaglia, J.; Quinn, S. J.; Sakstrup, J.; Santia, Marco D.; Shanab, S.; Simón, A.; Spyrou, A.; Thiagalingam, E.

doi:10.1103/physrevc.92.031302

Cited by 14 publications

(22 citation statements)

References 23 publications

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“…New values derived in the present work are not intended to supersede those from Refs. [33,34], but rather to complement them. In this section, the analysis procedure is described in detail and the experimental results are presented.…”

Section: Data Analysis and Experimental Resultsmentioning

confidence: 99%

“…In this work we will focus on the decay to levels of 26 Si as the 25 Al levels have already been discussed in Ref. [33].…”

Section: Data Analysis and Experimental Resultsmentioning

confidence: 99%

“…[33,34], but independent sorting and analysis routines were developed and employed. The values extracted are therefore slightly different, but consistent within uncertainties.…”

Section: Data Analysis and Experimental Resultsmentioning

confidence: 99%

“…Low orbital angular momentum orbitals enhance the halo effect, since higher ℓ-values give rise to a confining centrifugal barrier. The low separation energy of 26 P (143(200) keV [30], 0(90) keV [8]), together with the narrow momentum distribution and enhanced cross section observed in proton-knockout reactions [38] give some experimental evidence for the existence of a proton halo in 26 P. In this paper, we present a comprehensive summary of the β-delayed γ decay of 26 P measured at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University during a fruitful experiment for which selected results have already been reported in two separate shorter papers [33,34]. In the present work, the Gamow-Teller strength, B(GT ), and the experimental f t values are compared to theoretical calculations and to the decay of the mirror nucleus 26 Na to investigate the Gamow-Teller strength and mirror asymmetry, re- spectively.…”

Section: Introductionmentioning

confidence: 99%

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β-delayedγdecay ofP26: Possible evidence of a proton halo

Pérez–Loureiro¹,

Wrede²,

Bennett³

et al. 2016

Phys. Rev. C

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Background: Measurements of β decay provide important nuclear structure information that can be used to probe isospin asymmetries and inform nuclear astrophysics studies.Purpose: To measure the β-delayed γ decay of 26 P and compare the results with previous experimental results and shell model calculations. Method:A 26 P fast beam produced using nuclear fragmentation was implanted into a planar germanium detector. Its β-delayed γ-ray emission was measured with an array of 16 high-purity germanium detectors. Positrons emitted in the decay were detected in coincidence to reduce the background. Results:The absolute intensities of 26 P β-delayed γ-rays were determined. A total of six new β-decay branches and 15 new γ-ray lines have been observed for the first time in 26 P β-decay. A complete β-decay scheme was built for the allowed transitions to bound excited states of 26 Si. f t values and Gamow-Teller strengths were also determined for these transitions and compared with shell model calculations and the mirror β-decay of 26 Na, revealing significant mirror asymmetries. Conclusions:A very good agreement with theoretical predictions based on the USDB shell model is observed. The significant mirror asymmetry observed for the transition to the first excited state (δ = 51(10)%) may be evidence for a proton halo in 26 P.

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Section: Data Analysis and Experimental Resultsmentioning

confidence: 99%

“…In this work we will focus on the decay to levels of 26 Si as the 25 Al levels have already been discussed in Ref. [33].…”

Section: Data Analysis and Experimental Resultsmentioning

confidence: 99%

“…[33,34], but independent sorting and analysis routines were developed and employed. The values extracted are therefore slightly different, but consistent within uncertainties.…”

Section: Data Analysis and Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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β-delayedγdecay ofP26: Possible evidence of a proton halo

Pérez–Loureiro¹,

Wrede²,

Bennett³

et al. 2016

Phys. Rev. C

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“…The present experiment is one in a series of recent β-delayed γ decay experiments to investigate the sd shell using fast neutron-deficient beams at the National Superconducting Cyclotron Laboratory [16,[38][39][40][41]. In particular, the β-delayed γ decay of 31 Cl was measured using an experimental procedure that was already described in [38].…”

Section: Methodsmentioning

confidence: 99%

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

Bennett¹,

Wrede²,

Brown³

et al. 2016

Phys. Rev. C

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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.

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Nuclear Data Sheets for A = 26

Basunia

Hurst

2016

Nuclear Data Sheets

111

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Evaluated spectroscopic data and level schemes from radioactive decay and nuclear reaction studies are presented for 26 O, 26 F, 26 Ne, 26 Na, 26 Mg, 26 Al, 26 Si, 26 P, and 26 S. This evaluation for A=26 supersedes the earlier one by P. M. Endt (1998En04) and updates for some nuclides in ENSDF. Highlights of this evaluation are the following: This evaluation includes search results for 26 S nuclide and its proton-decay mode (2011Fo08). An isomeric state (2.2 ms) in 26 F has been discovered by 2013Le03. The state is proposed at 643.4 keV 1 from γ-ray measurements. Internal-transition and beta-decay branches for the state are also determined. New excited levels in 26 Ne have been identified from 26 F βdecay (2.2 ms). For some 26 Si resonance states conflicting spin-parity assignments exist in the literature. These are identified by footnotes. 2015Do07 (3 He,nγ) propose the first 0+ state above proton separation energy at an excitation energy of 5890 keV and suggested for additional independent measurements to confirm or refute the existence of 5946 keV 4. 2016Ch09 consider 5946 keV level as a distinct excited state in their reanalysis of the literature data with possible spin-parity assignment of 0+ or 4+ This evaluation also includes discovery of an isomeric state, at 164.1 keV 1, in 26 P by 2014NiZZ.

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Observation of Doppler broadening inβ-delayed proton-γdecay

Cited by 14 publications

References 23 publications

β-delayedγdecay ofP26: Possible evidence of a proton halo

β-delayedγdecay ofP26: Possible evidence of a proton halo

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

Nuclear Data Sheets for A = 26

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