**ADOPTED LEVELS, GAMMAS for ^{42}Si**

__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 | ^{9}Be(^{44}S,^{42}SiG) | B | C(^{44}S,^{42}SiG) |

E(level) (keV) | XREF | J^{π}(level) | T_{1/2}(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.

J^{π}(level): From systematics of even-even nuclei

E(γ): From C(^{44}S,^{42}Siγ).

__Additional Level Data and Comments__:

E(level) | J^{π}(level) | T_{1/2}(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 ^{42}Si is deformed and that there is collapse of n=28 closed shell at Z=14. But the small production cross section of ^{42}Si in both studies (2006Fr13 and 2006GrZZ) suggest closed shell nature of ^{42}Si.E(level): Low energy of 2 ^{+} state and comparison of measured half-life with QRPA calculations (2004Gr20) suggest that ^{42}Si is deformed and that there is collapse of n=28 closed shell at Z=14. But the small production cross section of ^{42}Si in both studies (2006Fr13 and 2006GrZZ) suggest closed shell nature of ^{42}Si. |

E(level) | E(gamma) | Comments |

742 | 742 | E(γ): 770 19 from ^{9}Be(^{44}S,^{42}Siγ). |

2774 | 2032 | E(γ): possible partial feeding of the 2^{+} state at 742 keV (2012Ta20) |

1990Le03:

^{42}Si identified and produced in^{64}Ni(^{48}Ca,X) reaction at E=44 MeV/nucleon, followed by a measurement of fragment spectra versus atomic number.2004Gr20 (also 2004Gr28,2003Gr22):

^{42}Si produced in^{9}Be(^{48}Ca,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 calculations2006Fr13 (also 2005Fr19), 2006GrZZ: see

^{9}Be(^{44}S,Xγ) data-set1999YoZW, from fragmentation of

^{48}Ca beam using^{9}Be(^{48}Ca,X) and^{181}Ta(^{48}Ca,X) reactions at 70 MeV/nucleon; measured T_{1/2}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)=46620780, Q(β^{-}n)=13470510(syst,2012Wa38)