ADOPTED LEVELS, GAMMAS for 55Sc
Author: Balraj Singh | Citation: ENSDF | Cutoff date: 30-Apr-2022
Author: Huo Junde | Citation: Nucl. Data Sheets 109, 787 (2008) | Cutoff date: 30-Apr-2007
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=10990 keV 70 | S(n)= 4480 keV 60 | S(p)= 12970 keV 80 | Q(α)= -10750 keV 60 | ||
| Reference: 2021WA16 |
| References: | |||
| A | 9Be(56Ti,55ScG),(55Sc,55Sc’γ) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | Final Levels | |
| 0 | A | (7/2-) | 96 ms 2 % β- = 100 % β-n ≈ 17 7 | ||||
| 695 5 | A | (3/2-) | 695 5 | 100 | 0 | (7/2-) | |
| 1267 7 | A | (1/2-) | 572 4 | 100 | 695 | (3/2-) | |
| 1730 20 | A | (7/2-) | 1730 20 | 100 | 0 | (7/2-) | |
| 2786 20 | A | (1/2+) | 2091 19 | 100 | 695 | (3/2-) | |
| 2806 12 | A | (1/2,3/2,5/2-) | 1539 10 | 100 | 1267 | (1/2-) | |
| 3135 20 | A | (3/2+) | 1854 27 2452 26 | 100 15 70 10 | 1267 695 | (1/2-) (3/2-) | |
E(level): From 9Be(56Ti,55Scγ),(55Sc,55Sc’γ)
Jπ(level): As suggested in 9Be(56Ti,55Scγ),(55Sc,55Sc’γ) (2017St22), based on predictions of detailed calculations using shell-model and valence-space in-medium similarity renormalization group (VS-IM-SRG) method. Exception is Jπ for the 2806 level, with no corresponding level in theoretical calculations
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | (7/2-) | 96 ms 2 % β- = 100 % β-n ≈ 17 7 | Theoretical T1/2=27.4 ms, %β-n=15 (2019Mo01). E(level): Theoretical T1/2=27.4 ms, %β-n=15 (2019Mo01). |
1990Tu01: mass excess of 55Sc measured in Th(p,F),E=800 MeV, followed by separation of fragments by α/Q using the Time-of-Flight Isochronous (TOFI) spectrometer at the Los Alamos Meson Physics Facility. Deduced mass excess=-28.5 MeV 10 for 55Sc (1990Tu01) is within ≈2σ of evaluated mass excess of -30840 keV 60 (2021Wa16). However, in a later work 1994Se12 by the same group as 1990Tu01, and using the same experimental methods, mass excess of 55Sc was not reported, which may cast some doubt on the results reported in 1990Tu01
1998So03: 55Sc produced and identified in 9Be(65Cu,X), E=64.5 MeV/nucleon reaction using LISE3 separator at GANIL. Measured half-life of 55Sc decay from (implants)(β decay) correlated events. α total of 42 events were assigned to 55Sc nuclide.
2004Li75 (also 2002Sh43): 55Sc produced in 9Be(86Kr,X), E=140 MeV/nucleon reaction using A1900 fragment separator at NSCL-MSU. Measured half-life of 55Sc decay from (implants)(β decay) correlated events, and identified a 592-keV γ ray from the decay of 55Sc.
2008Ma01: 55Sc produced in 9Be(76Ge,X), E=140 MeV/nucleon reaction using A1900 fragment separator at NSCL-MSU. Measured half-life of 55Sc decay from (implants)(β decay) correlated events, and identified a 592-keV γ ray from the decay of 55Sc.
2010Cr02: 55Sc produced in 9Be(86Kr34+,X) fragmentation reaction at E=140 MeV/nucleon, A1900 fragment separator. Measured Eγ, Iγ, γγ-coin, βγ-coin, half-life of 55Sc decay using a double-sided Si microstrip detector (DSSD) and the SeGA array of HPGe detectors, arranged around the β counting system (BCS) and comprised six HPGe detectors
Mass measurements: 2021Le02, 2020Me06, 2020Mi13, 2015Me08, 2011Es06, 1990Tu01 (from reaction Q value)
Theoretical calculations: six primary references (five for structure and one for 55Sc decay) retrieved from the NSR database at www.nndc.bnl.gov/nsr/. These are listed in this dataset under ’document’ records.
Q-value: Q(β-n)=6830 60, S(2n)=8220 60, S(2p)=33120 130 (2021Wa16)