Gamow-Teller transition of the proton-rich nucleus [sup 24]Si

Ichikawa, Y.; Onishi, T. K.; Suzuki, D.; Iwasaki, H.; Kubo, T.; Naik, Vaishali; Aoi, N.; Brown, B. A.; Fukuda, N.; Kubono, S.; Motobayashi, T.; Nakabayashi, T.; Nakamura, Takashi; Nakao, T.; Okumura, T.; Ong, H. J.; Suzuki, Hirosuke; Suzuki, Mahiko; Teranishi, Takashi; Yamada, Kazunari; Yamaguchi, Hideyo; Sakuraï, H.

doi:10.1063/1.3442606

Cited by 1 publication

(42 citation statements)

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“…To reduce the systematic uncertainty associated with extrapolation, further energy calibration was applied by including four 25 Si(βpγ) 24 Mg lines known with very good precision at 1368.626 (5), 2754.007 (11), 2869.50 (6), and 4237.96 (6) keV as standards [44]. These γ rays are emitted from the recoiling 24 Mg after the β-delayed proton emission of 25 Si. Therefore, the γ-ray line shape is Doppler-broadened, and the regular EMG function is not suited to fit the peak.…”

Section: Analysis a γ-Ray Energy And Efficiency Calibrationmentioning

confidence: 99%

“…The proton-detection efficiency simulated for full utilization of all 13 readout pads [36] cannot be used in this case. Even though the proton information in our work is incomplete, we can normalize the literature relative intensities for each proton branch to the 25 Si(βpγ) 24 Mg intensities measured in this work (Sec. IV B).…”

Section: B Proton Energy and Efficiency Calibrationmentioning

confidence: 99%

“…where I βp is the total intensity of all 25 Si(βp) 24 Mg transitions, and I βγ is the total intensity of all 25 Si(βγ) 25 Al transitions.…”

Section: Normalizationmentioning

confidence: 99%

“…The intensity of the 25 Si(βpγ) 24 Mg (I βpγ ) accounts for 59.0(5)% of the total 25 Si(βp) 24 Mg intensity based on the previous β-delayed proton measurements [15][16][17]. The remainder of our normalization procedure is entirely based on the γ-ray intensities.…”

Section: Normalizationmentioning

confidence: 99%

“…A nonzero mirror asymmetry parameter implies abnormal nuclear structure, such as halo structure in the initial and/or final state. In view of the asymmetries reported in the nearby sd-shell nuclei 20 Mg− 20 O [18-21], 22 Si− 22 O [22,23], 24 Si− 24 Al [24-26] 26 P− 26 Na [27,28], 27 S− 27 Na [29][30][31][32], it is desirable to extend this test to 25 Si and its mirror partner nucleus 25 Na [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

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β -decay spectroscopy of S27

Sun¹,

Xu²,

Lin³

et al. 2019

Phys. Rev. C

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Background: β-decay spectroscopy provides valuable information on exotic nuclei and a stringent test for nuclear theories beyond the stability line. Purpose: To search for new β-delayed protons and γ rays of 25 Si to investigate the properties of 25 Al excited states. Method: 25 Si β decays were measured by using the Gaseous Detector with Germanium Tagging system at the National Superconducting Cyclotron Laboratory. The protons and γ rays emitted in the decay were detected simultaneously. A Monte Carlo method was used to model the Doppler broadening of 24 Mg γ-ray lines caused by nuclear recoil from proton emission. Shell-model calculations using two newly-developed sd-shell Hamiltonians, USDC and USDI, were performed. Results: The most precise 25 Si half-life to date has been determined. A new proton branch at 724(4) keV and new proton-γ-ray coincidences have been identified. Three 24 Mg γ-ray lines and eight 25 Al γ-ray lines are observed for the first time in 25 Si decay. The first measurement of the 25 Si β-delayed γ ray intensities through the 25 Al unbound states is reported. All the bound states of 25 Al are observed to be populated in the β decay of 25 Si. Several inconsistencies between the previous measurements have been resolved, and new information on the 25 Al level scheme is provided. An enhanced decay scheme has been constructed and compared to the mirror decay of 25 Na and the shell-model calculations. Conclusions: The measured excitation energies, γ-ray and proton branchings, log f t values, and Gamow-Teller transition strengths for the states of 25 Al populated in the β decay of 25 Si are in good agreement with the shell model calculations, offering gratifyingly consistent insights into the fine nuclear structure of 25 Al.

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