ADOPTED LEVELS, GAMMAS for 42Si
Authors: Jun Chen and Balraj Singh | Citation: Nucl. Data Sheets 135, 1 (2016) | Cutoff date: 31-May-2016
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=15550 keV SY | S(n)= 3630 keV SY | S(p)= 24620 keV SY | Q(α)= -19940 keV SY | ||
Reference: 2012WA38 |
References: | |||
A | 9Be(44S,42SiG) | B | C(44S,42SiG) |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | Final Levels | |
0 | AB | 0+ | 12.5 ms 35 % β- = 100 % β-n = ? % β-2n = ? | |||
742 8 | AB | (2+) | 742 8 | 0 | 0+ | |
2173 14 | B | (4+) | 1431 11 | 742 | (2+) | |
2774 12 ? | B | 2032 9 ? | 742 | (2+) |
E(level): From a least-square fit to γ energies.
Jπ(level): From systematics of even-even nuclei
E(γ): From C(44S,42Siγ).
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0 | 0+ | 12.5 ms 35 % β- = 100 % β-n = ? % β-2n = ? | %β-n=103 48 (1999YoZW, preliminary result). E(level): %β-n=103 48 (1999YoZW, preliminary result). |
742 | (2+) | Low energy of 2+ state and comparison of measured half-life with QRPA calculations (2004Gr20) suggest that 42Si is deformed and that there is collapse of n=28 closed shell at Z=14. But the small production cross section of 42Si in both studies (2006Fr13 and 2006GrZZ) suggest closed shell nature of 42Si. E(level): Low energy of 2+ state and comparison of measured half-life with QRPA calculations (2004Gr20) suggest that 42Si is deformed and that there is collapse of n=28 closed shell at Z=14. But the small production cross section of 42Si in both studies (2006Fr13 and 2006GrZZ) suggest closed shell nature of 42Si. |
E(level) | E(gamma) | Comments |
742 | 742 | E(γ): 770 19 from 9Be(44S,42Siγ). |
2774 | 2032 | E(γ): possible partial feeding of the 2+ state at 742 keV (2012Ta20) |
1990Le03: 42Si identified and produced in 64Ni(48Ca,X) reaction at E=44 MeV/nucleon, followed by a measurement of fragment spectra versus atomic number.
2004Gr20 (also 2004Gr28,2003Gr22): 42Si produced in 9Be(48Ca,X) at E=60 MeV/nucleon, LISE3 spectrometer at GANIL, isotopic identification by energy loss, time-of-flight and magnetic rigidities, double-sided Si strip (DSSD) detectors for residues. Measured (β)(residues) time correlations and half-life using scintillation detectors for β rays. Detailed QRPA calculations. Predictions of Gamow-Teller strengths, Iβ and %β-n for spherical, prolate (ε=+0.3) and oblate (ε=-0.3) shapes. The measured half-life suggests deformed shape when compared with QRPA calculations
2006Fr13 (also 2005Fr19), 2006GrZZ: see 9Be(44S,Xγ) data-set
1999YoZW, from fragmentation of 48Ca beam using 9Be(48Ca,X) and 181Ta(48Ca,X) reactions at 70 MeV/nucleon; measured T1/2 and %β-n; according to the authors, the results are preliminary.
Mass measurement: mass excess=15160 580 (2007Ju03)
Recent theory papers: 2016Li07, 2011Li47, 2011Ka03, 2010Sm02 and 2010Ga15 (shell-model calculations), 2010Ha33 (quadrupole moment), 2009Co21 (half-life), 2009No01 and 2009Zi01 (B(E2))
Q-value: Estimated uncertainties (syst,2012Wa38): ΔQ(β-)=550, ΔS(n)=620, ΔS(p)=780, ΔQ(α)=710 (2012Wa38)
Q-value: S(2n)=5010 550, S(2p)=46620 780, Q(β-n)=13470 510 (syst,2012Wa38)