ADOPTED LEVELS, GAMMAS for 55Ca
Author: Balraj Singh | Citation: ENSDF | Cutoff date: 30-Apr-2022
Author: Balraj Singh | Citation: ENSDF | Cutoff date: 10-MAY-2009
Author: Huo Junde | Citation: Nucl. Data Sheets 109, 787 (2008) | Cutoff date: 30-Apr-2007
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=1219×101 keV 17 | S(n)= 156×101 keV 17 | S(p)= 20790 keV SY | Q(α)= -14590 keV SY | ||
| Reference: 2021WA16 |
| References: | |||
| A | 1H(56Ca,NPG) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) |
| 0 | A | (5/2-) | 22 ms 2 % β- = 100 % β-n = ? % β-2n = ? | |||
| 673 17 | A | (1/2-) | 0.78 ns +36-23 | 673 17 | 100 | [E2] |
Jπ(level): from theoretical calculations (2022Ko06) using different models: large-scale shell model (LSSM), ab-initio valence-space in-medium similarity renormalization group (VS-IMSRG), and full-space self-consistent Green’s function (SCGF NNLOsat and SCGF NN+3N(lnl)).
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Additional Data |
| 673 | (1/2-) | 0.78 ns +36-23 | 673 17 | [E2] | B(E2)(W.u.)=0.42 +18-13 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | (5/2-) | 22 ms 2 % β- = 100 % β-n = ? % β-2n = ? | Theoretical T1/2=19.1 ms, %β-n=0, %β-2n=0 (2019Mo01). E(level): Theoretical T1/2=19.1 ms, %β-n=0, %β-2n=0 (2019Mo01). |
1997Be70: 55Ca identified in 9Be(238U,F), E=750 MeV/nucleon, fragments separator (FRS) at GSI facility, identification by time-of-flight. Measured production cross section
2008Ma01: 55Ca isotope produced in 9Be(76Ge,X) reaction at E=140 MeV/nucleon 76Ge beam provided by NSCL at Michigan State University. Isotopes separated with A1900 fragment separator. Time-of-flight technique. Measured β particles using Beta Counting System of three Si PIN detectors, a double-sided silicon strip detector and six single sided silicon strip detectors. Detected γ rays using 16 Ge detectors of the Segmented Germanium array. Measured half-life of 55Ca by fitting the decay curves to a function which included decay of the parent, growth and decay of daughter and a constant background. No gamma rays were seen in correlation with β rays.
Mass measurement: 2018Mi08
Theoretical calculations: 28 primary references (27 for structure and one for 55Ca decay) retrieved from the NSR database at www.nndc.bnl.gov/nsr/. These are listed in this dataset under ’document’ records.
Q-value: Estimated uncertainties (2021Wa16): 430 for S(p) and Q(α)
Q-value: Q(β-n)=7720 160, S(2n)=5410 170, S(2p)=40020 720 (syst) (2021Wa16)
Q-value: Q(β-2n)=3980 160 deduced by evaluator from relevant mass values in 2021Wa16