ADOPTED LEVELS, GAMMAS for 138Sn
Author: Jun Chen | Citation: Nucl. Data Sheets 146, 1 (2017) | Cutoff date: 30-Sep-2017
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=9360 keV SY | S(n)= 3140 keV SY | S(p)= 16760 keV CA | Q(α)= -7120 keV CA | ||
| Reference: 2017WA10 |
| References: | |||
| A | 138Sn IT decay (210 NS) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0 | A | 0+ | 140 ms +30-20 % β- = 100 % β-n = 36 12 % β-2n = ? | |||||
| 715 1 | A | (2+) | 715 1 | 100 | [E2] | 0 | 0+ | |
| 1176 2 | A | (4+) | 461 1 | 100 | [E2] | 715 | (2+) | |
| 1344 2 | A | (6+) | 210 ns 45 % IT = 100 | 168 1 | 100 | [E2] | 1176 | (4+) |
Jπ(level): From shell-model predictions (2014Si18) and systematics of even-even semi-magic nuclei
E(γ): From 138Sn IT decay.
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 715 | (2+) | 715 1 | [E2] | 0.0028 | α=0.0028 | |
| 1176 | (4+) | 461 1 | [E2] | 0.0093 | α=0.0093 | |
| 1344 | (6+) | 210 ns 45 % IT = 100 | 168 1 | [E2] | 0.255 | B(E2)(W.u.)=0.36 8, α=0.255 7 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 0+ | 140 ms +30-20 % β- = 100 % β-n = 36 12 % β-2n = ? | %β-n: preliminary value is 36 12 (2007ArZQ). Theoretical values: %β-n=100 (2002Pf04), 83.3 (2003Mo09), 70.3 (2014Mi23); %β-2n=3.9 (2003Mo09), 0.2 (2014Mi23). |
| 1344 | (6+) | 210 ns 45 % IT = 100 | Dominant νf7/22 configuration (2014Si18). |
First identification of 138Sn nuclide by 2010Oh02 via Be(238U,F).
2010Oh02: 138Sn nuclide identified in Be(238U,F) and Pb(238U,F) reactions with a 238U86+ beam energy of 345 MeV/nucleon produced by the cascade operation of the RBIF accelerator complex of the linear accelerator RILAC and four cyclotrons RRC, fRC, IRC and SRC. Identification of 138Sn nuclei was made on the basis of magnetic rigidity, time-of-flight and energy loss of the fragments using BigRIPS fragment separator. Experiments performed at RIKEN facility. Based on α/Q spectrum and Z versus α/Q plot, 23 counts were assigned to 138Sn isotope. (Q=charge state)
2015Lo04: 138Sn ions were produced at RIBF-RIKEN facility in 9Be(238U,F) reaction at E=345 MeV/nucleon with an average intensity of 6×1010 ions/s. Identification of 138Sn was made by determining atomic Z and mass-to-charge ratio α/Q, where Q=charge state of the ions. The selectivity of ions was based on magnetic rigidity, time-of-flight and energy loss. The separated nuclei were implanted at a rate of 50 ions/s in a stack of eight double-sided silicon-strip detector (WAS3ABi), surrounded by EURICA array of 84 HPGe detectors. Correlations were recorded between the implanted ions and β rays. The half-life of 138Sn isotope was measured from the correlated ion-β decay curves and maximum likelihood analysis technique as described in 2014Xu07. Comparison of measured half-lives with FRDM+QRPA, KTUY+GT2 and DF3+CQRPA theoretical calculations
2007ArZQ (thesis): 138Sn possibly identified in bombardment of UCx target with 1 GeV protons followed by selective ionization with the Resonance Ionization Laser Ion Source (RILIS) and high-resolution mass separator (HRS) at ISOLDE-CERN facility. Measured delayed neutrons to deduce half-life and Pn (delayed neutron emission probability). Identification in this work should be considered as tentative since in later formal publication of this work in 2011Ar18, 138Sn was not discussed
Theoretical nuclear structure calculations:
2017Ja09, 2015Na10: calculated binding energies, B(E2), energy levels, J, π
2012Ca27: calculated levels, J, π, B(E2), B(E3)
2010Sa14, 2008Sa32: calculated binding energies, levels, J, π, B(E2), configuration mixing, magnetic dipole moments, electric quadrupole moments.
2008Ma17: calculated odd-even mass staggering, binding energies, two-neutron separation energies, pairing gaps
2007Ji05, 2007Ji14: calculated levels, J, π, B(E2), B(M1), g factors
2007Ka40: calculated binding energies, single and two neutron separation energies, level energies, J, π, B(E2)
2004Sh46: calculated level energies, B(E2), quadrupole matrix elements, g factors
Consult NSR database for additional about 30 theoretical papers.
Q-value: ΔQ(β-)=1180, ΔS(n)=640, ΔS(p)=710, ΔQ(α)=640 (2017Wa10)
Q-value: Q(β-n)=7130 510, S(2n)=5100 590, Q(2β+)=20840 500 (syst,2017Wa10), S(2p)=31430 (theory,1997Mo25)