ADOPTED LEVELS for 31Ne
Authors: Jun Chen and Balraj Singh | Citation: Nucl. Data Sheets 184, 29 (2022) | Cutoff date: 24-Jun-2022
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=1.894×104 keV 27 | S(n)= 1.7×102 keV 13 | S(p)= 25070 keV SY | Q(α)= -15910 keV SY | ||
| Reference: 2021WA16 |
| References: | |||
| A | C(31Ne,30Ne) | B | 9Be(33Mg,X) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) |
| 0 | A | (3/2-) | 3.4 ms 8 % β- = 100 % β-n = ? % β-2n = ? % B-3N = ? % B-4N = ? |
| 0.30E3 17 ? | B | ||
| 1092? | B | ||
| 1.50E3 33 ? | B | ||
| 2292? | B | ||
| 2535? | B | ||
| 3735? | B |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | (3/2-) | 3.4 ms 8 % β- = 100 % β-n = ? % β-2n = ? % B-3N = ? % B-4N = ? | Only the β- decay has been observed, and particle stability established by 1996Sa34 and 1997Sa14. E(level): Only the β- decay has been observed, and particle stability established by 1996Sa34 and 1997Sa14. |
Mass measurements:
2012Ga45, 2007Ju03: time-of-flight and energy loss method at GANIL. Measured mass excess=31.44 MeV 31 (2012Ga45), 30.82 MeV 162 (2007Ju03)
Other measurements:
1990Gu02: Ta(48Ca,X) E=2112 MeV, measured fragment total kinetic energy, time-of-flight, no events were seen for 31Ne from which particle instability was implied for 31Ne. Later works of 1996Sa34 and 1997Sa14, however, discovered many events associated with 31Ne, thus proving that it is a bound nucleus.
1996Sa34: 181Ta(50Ti,X) E=80 MeV/nucleon. Measured fragment total kinetic energy, time-of-flight, magnetic rigidity. α total of 23 events were associated with 31Ne
1997Sa14 (conference paper): 181Ta(48Ca,X) E=70 MeV/nucleon. Measured fragment total kinetic energy, time-of-flight, magnetic rigidity. α total of 90 events were associated with 31Ne
1998NoZW, 1998NoZZ: 181Ta(40Ar,X); fragmentation of 40Ar beam. Measured isotopic half-life from β-decay curve
1998NoZW, 1998NoZZ, 1997Sa14 and 1996Sa34 are from the same group at RIKEN facility. Reaction fragments analyzed by RIPS spectrometer. Detectors: parallel plate avalanche chamber (PPAC) and several surface barrier silicon detectors
2007Ju03: Measured mass by time-of-flight and energy-loss magnetic spectrograph spectrometer at GANIL. 31Ne formed by fragmentation of 48Ca beam on a Ta target.
2009Na39, 2010Ta16: Pb,C(31Ne,30Ne), E=230-243 MeV/nucleon; measured reaction fragments; deduced Coulomb breakup cross section of 540 mb 70, soft E1 excitations for 31Ne, B(E1), deformation and halo effects. RIBF facility at RIKEN. Configuration of 2p3/2 is proposed instead of 1f7/2
2012Ta02: 12C(31Ne,31Ne’) E=240 MeV/nucleon; 31Ne beam from fragmentation of 345 MeV/nucleon 48Ca with 9Be target at RIKEN facility and using BigRIPS magnetic spectrometer.
2012Su09 (also 2012Mi01): 12C(31Ne,31Ne’) E=240 MeV/nucleon: analyzed interaction σ, σ(θ); deduced deformation parameter as ≈0.4 in the ’Island of Inversion’.
Theoretical analysis of structure of 31Ne g.s. based on single-neutron removal and Coulomb dissociation experimental results: 2017Ho27, 2012Ur06, 2010Ha05, 2010Ho03
31Ne nuclide is relevant to the ’Island of Inversion’ and halo structure
Theoretical calculations: 35 primary references for nuclear structure and one for decay characteristics retrieved from the NSR database (www.nndc.bnl.gov/nsr/) are listed under ’document records’.
Q-value: ΔS(p)=570, ΔQ(α)=570 (syst,2021Wa16)
Q-value: S(2n)=3360 310, Q(β-n)=14640 270 (2021Wa16)
Q-value: Q(β-2n)=12360 270, Q(β-3n)=7960 270, and Q(β-4n)=4410 270 deduced by evaluators from masses in 2021Wa16.