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

doi:10.1103/physrevc.96.014306

Cited by 4 publications

(8 citation statements)

References 32 publications

(58 reference statements)

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“…USDA+CD and USDB+CD both predict a 3 + ground state and a lowlying 1 + excited state at 32 and 109 keV, respectively. Using the shell-model B(E2) values and the experimental level energy of 164.4 keV, the half-life of the 1 + state is predicted to be 128 ns for USDA+CD and 174 ns for USDB+CD, in broad agreement with the experimental values of 120( 9) ns [11] and 104( 14) ns [12]. In both shellmodel predictions for 26 P, the second and third excited states have spin-parity 2 + , like in the mirror, and are under 500 keV in excitation energy while the next excited state is above 1.2 MeV.…”

Section: Resultssupporting

confidence: 72%

“…164.4(1) keV [11] and 164.4(3(2)) keV [12] for the first excited state in 26 P, suggesting a level at 244 keV with γ-decay branches to the (3 + ) ground state and the (1 + ) first excited state. Since the 164.4-keV level has a halflife on the order of 100 ns and the velocity of the 26 P projectiles was around 0.4c, the γ decay of this state occurred far behind the target on average and could not be measured in the experiments discussed here.…”

Section: Resultsmentioning

confidence: 95%

“…The observed narrow momentum distribution and enhanced cross section for one-proton knockout [5] along with significant mirror asymmetry in β decay [6] have provided evidence for 26 P having a proton halo [7][8][9][10]. In recent experiments, the first excited state in 26 P was reported by Nishimura et al at an energy of 164.4 (1) keV with a 120 (9) ns halflife [11] and later confirmed by Pérez-Loureiro et al at 164.4(3(2)) keV with a 104 (14) ns half-life [12] with no other excited states observed.…”

Section: Introductionmentioning

confidence: 98%

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Spectroscopy and lifetime measurements near the proton drip line: P26,27,28

et al. 2019

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We report on the observation of excited states in the neutron-deficient phosphorus isotopes 26,27,28 P via in-beam γ-ray spectroscopy with both high-efficiency and high-resolution detector arrays. In 26 P, a previously-unobserved level has been identified at 244(3) keV, two new measurements of the astrophysically-important 3/2 + resonance in 27 P have been performed, γ decays have been assigned to the proton-unbound levels at 2216 keV and 2483 keV in 28 P, and the γ-ray lineshape method has been used to make the first determination of the lifetimes of the two lowest-lying excited states in 28 P. The expected Thomas-Ehrman shifts were calculated and applied to levels in the mirror nuclei. The resulting level energies from this procedure were then compared with the energies of known states in 26,27,28 P.

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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 98%

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Spectroscopy and lifetime measurements near the proton drip line: P26,27,28

et al. 2019

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“…Intensities were found by normalizing to the 1613-keV γ ray, which is known to have an absolute intensity of 2.2 ± 0.2 % [17] based on the proton feeding of the 1613-keV excited state (Table I). The intensity of the 844-keV peak and its uncertainty were determined by combining the acquired 26 Si data set with sd-shell model calculations [21,22] to predict, and subtract, the small contribution of 0.33 ± 0.17 % from the 26 P(βγ) 26 Si line.…”

Section: Energy (Kev) Intensity (%)mentioning

confidence: 99%

Observation of Doppler broadening inβ-delayed proton-γdecay

et al. 2015

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Background: The Doppler broadening of γ-ray peaks due to nuclear recoil from β-delayed nucleon emission can be used to measure the energies of the nucleons. This method has never been tested using β-delayed proton emission or applied to a recoil heavier than A = 10. Purpose: To test and apply this Doppler broadening method using γ-ray peaks from the 26 P(βpγ) 25 Al decay sequence. Methods: A fast beam of 26 P was implanted into a planar Ge detector, which was used as a 26 P β-decay trigger. The SeGA array of high-purity Ge detectors was used to detect γ rays from the 26 P(βpγ) 25 Al decay sequence. Results: Radiative Doppler broadening in β-delayed proton-γ decay was observed for the first time. The Doppler broadening analysis method was verified using the 1613 keV γ-ray line for which the proton energies were previously known. The 1776 keV γ ray de-exciting the 2720 keV 25 Al level was observed in 26 P(βpγ) 25 Al decay for the first time and used to determine that the center-of-mass energy of the proton emission feeding the 2720-keV level is 5.1 ± 1.0 (stat.) ± 0.6 (syst.) MeV, corresponding to a 26 Si excitation energy of 13.3 ± 1.0 (stat.) ± 0.7 (syst.) MeV for the proton-emitting level. Conclusions: The Doppler broadening method has been demonstrated to provide practical measurements of the energies for β-delayed nucleon emissions populating excited states of nuclear recoils at least as heavy as A = 25.

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“…The present measurement is part of a recent program of high-resolution β + delayed γ decay measurements of proton-rich sd-shell nuclides [5][6][7][19][20][21][22][23][24][25]. The data set discussed in the present work was obtained over the course of approximately six hours at the National Superconducting Cyclotron Laboratory (NSCL) as calibration data for the analysis of an experiment designed to study the β decay of 31 Cl [6,19,20].…”

Section: Experiments Setupmentioning

confidence: 99%

Toward complete spectroscopy using β decay: The example of Cl32(βγ)S32
Aboud
¹
,
Bennett
²
,
Wrede
³

et al. 2018
Phys. Rev. C
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0
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Background: 32 Cl is a neutron-deficient isotope with a β-decay half-life of 298 ms and a spin and parity of J π = 1 +. Previous measurements of 32 Cl β-delayed γ-rays have yielded a β-decay scheme with twelve β-decay transitions, contributing to studies of nuclear structure and fundamental symmetries. Those experiments have been limited to the observation of 32 S states with J π = 0 + , 1 + , 2 +. Purpose: To search for new β-delayed γ-rays and β-decay transitions of 32 Cl to 32 S. Methods: A measurement of 32 Cl β delayed γ decay has been performed using the Clovershare array of high-purity germanium detectors at the National Superconducting Cyclotron Laboratory. Results: By acquiring the highest-statistics 32 Cl β-delayed γ-ray spectrum to date and exploiting a new sensitivity to γ-γ coincidences, this experiment has allowed for the observation of nine previously unobserved β-delayed γ-ray transitions leading to the inference of five β-decay transitions never before observed in 32 Cl β-delayed γ decay. The set of observed states includes negative-parity states for the first time. By combining the new information with data from previous work, the lifetimes and partial widths of the 8861 and 9650-keV states of 32 S have been determined. In addition, the 31 P(p,α) 28 Si resonance strength of the 9650-keV state has been limited to ωγ < 9.8 meV, which is an improvement over direct measurements. Conclusion: An enhanced decay scheme has been constructed. Most of the excited bound 32 S states that would correspond to allowed and first-forbidden β decay transitions have been observed, demonstrating the potential of β decay experiments to approach complete spectroscopy measurements at the next generation of radioactive beam facilities. The observed positive-parity levels are well matched by sd shell-model calculations.

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Confirmation of the isomeric state in P26

Cited by 4 publications

References 32 publications

Spectroscopy and lifetime measurements near the proton drip line: P26,27,28

Spectroscopy and lifetime measurements near the proton drip line: P26,27,28

Observation of Doppler broadening inβ-delayed proton-γdecay

Toward complete spectroscopy using β decay: The example of Cl32(βγ)S32
Aboud
¹
,
Bennett
²
,
Wrede
³

et al. 2018
Phys. Rev. C
Self Cite
2
0
2
0
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Confirmation of the isomeric state in P26

Cited by 4 publications

References 32 publications

Spectroscopy and lifetime measurements near the proton drip line: P26,27,28

Spectroscopy and lifetime measurements near the proton drip line: P26,27,28

Observation of Doppler broadening inβ-delayed proton-γdecay

Toward complete spectroscopy using β decay: The example of Cl32(βγ)S32Aboud1, Bennett2, Wrede3 et al. 2018Phys. Rev. CSelf Cite2020View full textAdd to dashboardCite

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Toward complete spectroscopy using β decay: The example of Cl32(βγ)S32
Aboud
¹
,
Bennett
²
,
Wrede
³

et al. 2018
Phys. Rev. C
Self Cite
2
0
2
0
View full text Add to dashboard Cite