ADOPTED LEVELS for 44Si
Authors: Jun Chen and Balraj Singh | Citation: Nucl. Data Sheets 190, 1 (2023) | Cutoff date: 20-Jun-2023
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=18200 keV SY | S(n)= 3090 keV SY | S(p)= 26250 keV SY | Q(α)= -22660 keV SY | ||
| Reference: 2021Wa16 |
| E(level) (keV) | Jπ(level) | T1/2(level) |
| 0 | 0+ | % β- = 100 % β-n = ? % β-2n = ? % B-3N = ? % B-4N = ? |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 0+ | % β- = 100 % β-n = ? % β-2n = ? % B-3N = ? % B-4N = ? | Allowed decay mode is β- followed by delayed-neutron emission, thus 100% β- decay mode is assigned by inference. E(level): Allowed decay mode is β- followed by delayed-neutron emission, thus 100% β- decay mode is assigned by inference. |
First identification of 44Si nuclide by 2007Ta15.
2007Ta15: W(48Ca,Xγ) E=142 MeV/nucleon beam from the National Superconducting Cyclotron Laboratory (NSCL). The fragments were separated with the A1900 fragment separator. Isotopic identification by multiple ΔE signals, magnetic rigidity, total energy and time-of-flight analysis. Detectors: plastic scintillators, parallel-plate avalanche counters (PPACs) and silicon PIN diodes. The 9Be target was also used with 48Ca beam
α total of three events were assigned to 44Si with natural tungsten target and no events due to 44Si were observed with a 9Be target.
Theoretical structure calculations:
2021Su18: calculated potential energy surface, occupation numbers for ground states in (β,γ) plane, energies, spins, B(E2) and quadrupole moments of low-lying positive-parity levels, proton and neutron single-particle levels as function of β and γ deformation parameters using antisymmetrized molecular dynamics (AMD) with Gogny D1S density functional.
2014Ca21, 2009No01: calculated energy, quadrupole moment, and B(E2) of the first 2+ states using Large-scale shell-model.
1999La18: calculated binding energy, radius, deformations, neutron shell gap suppression using relativistic Hartree plus Bogoliubov theory
Other theoretical calculations: 17 references for nuclear structure and one for radioactive decays retrieved from the NSR database (www.nndc.bnl.gov/nsr/) are listed in document records which can be accessed via web-based ENSDF database
Other theory references: 2021Ku13, 2020Ab12, 2020Th02, 2019Sa58, 2018Yo06, 2015Wu04, 2015Wu07, 2014Eb02, 2014Wa03, 2012Ch48, 2012Ho19,
Q-value: Estimated uncertainties (2021Wa16): 640 for Q(β-) and S(n), 780 for S(p), and 710 for Q(α)
Q-value: S(2n)=3670 580, Q(β-n)=16200 580 (syst,2021Wa16), S(2p)=50070 (theory,2019Mo01). Q(β-2n)=11900 510, Q(β-3n)=9900 515, Q(β-4n)=4990 510, and Q(β-5n)=1545 510 deduced by evaluators from relevant mass excesses in 2021Wa16