ADOPTED LEVELS, GAMMAS for 21N
Author: R.B. Firestone | Citation: Nucl. Data Sheets 127, 1 (2015) | Cutoff date: 15-Jan-2015
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=1.719×104 keV 10 | S(n)= 4.59×103 keV 11 | S(p)= 1.960×104 keV 26 | Q(α)= -2.094×104 keV 20 | ||
Reference: 2012WA38 |
References: | |||
A | 22C β-n decay (6.1 MS) | B | 9Be(36S,xγ) |
C | 1H(21N,21N’γ) |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | Final Levels | |
0.0 | A | (1/2-) | 84 ms 7 % β- = 100 % β-n = 86 4 | ||||
1160 30 | ABC | (3/2-) | 1159 29 | 100 | 0.0 | (1/2-) | |
2380 50 | A C | (5/2-) | 1220 29 2405? | 100 35 | 1160 0.0 | (3/2-) (1/2-) | |
3300 50 | B | (5/2-) | 884 27 ? 2142 33 | 100 21 | 2380 1160 | (5/2-) (3/2-) | |
3600 50 | B | (5/2+) | 1210? 2438 33 | 100 33 | 2380 1160 | (5/2-) (3/2-) | |
4170 50 | B | (7/2-) | 884 27 ? 1790 28 | 100 25 | 3300 2380 | (5/2-) (5/2-) |
Jπ(level): From comparison with shell-model calculations and decay pattern
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0.0 | (1/2-) | 84 ms 7 % β- = 100 % β-n = 86 4 | Measured σ=2.12 b 7 at 34.20 MeV/nucleon and 2.16 b 3 at 39.15 MeV/nucleon in Si(21N,X) reaction (2006Kh08); deduced strong absorption r02=1.231 fm2 15 (2006Kh08). |
1160 | (3/2-) | Configuration=πp1/2-1~#(first 2+ in 22O). | |
2380 | (5/2-) | Configuration=πp1/2-1~#(first 2+ in 22O). | |
3300 | (5/2-) | Configuration=πp1/2-1~#(3+ neutron excitation). | |
4170 | (7/2-) | Configuration=πp1/2-1~#(3+ neutron excitation). |
1970Ar09: first identification of 21N in 232Th(22Ne,X) reaction at E=174 MeV, measured yield.
1990Mu06: 21N produced in 181Ta(48Ca,X), E=2110 MeV at GANIL, measured half-life of 21N and β-delayed neutron emission probability
1991Re02,1995ReZZ: 21N produced in 232Th(p,X), E=800 MeV, LAMPF, TOFI spectrometer, measured half-life of 21N and β-delayed neutron emission probability
2000Sa47,2004Sa14: C(21N,20N) E=43 MeV/nucleon; 21N beam from C(40Ar,X), E=70 MeV/nucleon. GANIL coupled cyclotron facility, SPEG spectrometer. Measured one-neutron removal cross sections, Glauber-model analysis; deduced spin and parity of 21Ng.s.
2001Oz03: C(21N,X) E=1005 MeV/nucleon; 21N beam from fragmentation of 40Ar beam at 1 GeV/nucleon with 9Be and 181Ta targets. GSI, FRS facility. Measured interaction cross section and deduced matter radius
2006Kh08: Si(21N,X) E=34.20, 39.15, MeV/nucleon; 21N beam from fragmentation of 48Ca beam at 60.3 MeV/nucleon with 181Ta target. GANIL, SPEG facility. Measured cross sections and deduced r02
2009Li51 (also 2008Lo06): 21N beam produced in the reaction 9Be(26Mg,X), E=68.8 MeV/nucleon at RIBLL, HIRFL facility in Lanzhou. The 21N fragments were separated and stopped in an implantation detector. Energy loss and time-of-flight information used to identify incoming particles. Measured neutrons, β, γ-rays in singles and coincidence (βn, βγ, βγn) modes using neutron wall and neutron ball for neutrons, NE102 plastic scintillators for β particles and four segmented Clover HPGe detectors for γ-rays.
Populated by 22C β-n (one-neutron) decay (2003Yo02), T1/2=6.1 ms +14-12; %β-1n=61 +14-13. No 21N level data available in this decay.