Table II. Event chains attributed to 288115 decay. Eα uncertainties of 20 keV indicate full-energy recorded in pixel.
Larger Eα errors indicate that the energy was reconstructed between different detector chips or between the DSSSD and
the upstream detectors. Numbers in bold indicate that the decay was observed during a beam shutoff. Non-italicized
numbers are secure assignments, whereas italics indicates unsecure assignments. Black colors are evaporation residue
(EEVR), α-particle or spontaneous fission (SF) energies and positions. The three rows for each event chain are energies
recorded in Si detectors (black), lifetime (blue), and energies recorded in Ge detectors (Eph, green).
_________________________________________________________________________________________________
288
284
280
276
272
268
No.
115
113
111
109
107
105
Erec( MeV)
Eα1 (MeV)
Eα2 (MeV)
Eα3 (MeV)
Eα4 (MeV)
Eα5 (MeV)
ESF (MeV)
pixel (c,f,b)
Δtα1 (s)
Δtα2 (s)
Δtα3 (s)
Δtα4 (s)
Δtα5 (s)
ΔtSF (h)
Eph (keV)
Eph (keV)
Eph (keV)
Eph (keV)
nph (+200 ns)
(x,y)(cm)
Eph (keV)
__________________________________________________________________________________________________
0
3.85
10.29(13)b
9.96(2)
0.74(2)a
9.50(2)
0.50(2)a
137+66b
(1, 2, 24)
0.223
1.59
3.95
4.14
11.1
4.51
(-4.1, 0.9)
498.9(27)
479.6(23)
nph=4
1
8.48
(2, 10, 6)
(3.8, -1.2)
10.45(2)
0.0691
9.94(2)
2.92
9.85(5)b
4.56
9.77(2)
2.08
9.13(5)c
0.582
2
11.05
(2, 18, 19)
(2.0, -1.0)
10.61(2)
0.0987
10.04(2)
0.806
9.82(2)
10.3
9.53(5)c
0.218
9.16(2)
11.7
3
10.53
(0, 28, 18)
(-1.7, 1.5)
10.46(2)
0.384
9.95(2)
0.0889
4
7.53
(0, 20, 0)
(-3.1, 3.6)
10.50(5)b
0.393
9.97(2)
1.45
0.70(2) a
6.09
5
9.16
(1, 4, 17)
(-3.8, 0.4)
3.63(2)a
0.0785
9.95(6)c
2.21
9.75(2)
4.05
9.62(6)c
0.0171
0.32(2)a
17.1
127
63.5
nph=5
6
9.90
(2, 30, 2)
(4.4, 2.3)
0.62(2)a
0.0107
10.02(2)
3.71
5.53(2)a
3.53
9.59(2)
0.710
367.9(21)
9.11(2)
35.3
139r
15.5
nph=0
7
9.39
(2, 30, 4)
(4.1, 2.3)
10.56(2)
0.183
10.05(2)
2.88
9.81(2)g
5.14
9.21(10)b
35.3e
121
6.62
nph=2
8
11.65
(0, 27, 11)
(-2.5, 2.1)
10.49(5)b
0.214
9.82(2)
1.54
ESF=107
7.57
nph=6
9
7.06
(0, 11, 24)
(1.6, 2.4)
10.49(2)
0.0605
9.94(6)b
0.0281
513.7(21)
9.80(5)b
3.46
212.0(23)
9.50(5)c
0.349
9.20(5)c
1.08
106
62.7
nph=2
10
8.44
(0, 4, 17)
(1.6, 3.5)
10.21(5)c
0.144
9.99(2)
0.307
9.52(2)
0.710
9.57(2)
0.248
9.01(2)
19.38
9.95(5)b,d
3.72e
9.06(2)
4.72e
96
37.0
nph=4
98+36b
5.76
nph=3
9.60(2)
0.88(2)a,f
1.15
1.26
147.0(20), 135.7(26) 526.4(23)
11
9.92
(1, 9, 22)
(-3.1, 0.0)
0.52(2)a,h
0.234
9.77(5)c
3.59e
9.58(5)b
0.720
9.04(2)
18.0
139+24c
55.5
nph=6
12
11.18
(1, 20, 28)
(-1.6, 0.1)
10.49(2)
0.0591
ESF=187
0.824
nph=5
13
10.48
(2, 26, 24)
(1.3, -0.1)
0.82(2)a
0.0196
9.95(5)b
0.795
9.86(2)
0.778
452.7(25)
9.70(2)
0.405
9.01(2)
22.6
138+16c
27.9
nph=3
14
10.88
(2, 30, 24)
(1.3, 0.6)
5.28(2)a
0.000183
10.05(34)b
1.50
9.73(2)
6.50
234.0(24)
9.89(2)
0.606
0.94(2)i
26.9
153+7
35.0
nph=4
15
j
10.25(2)
(1, 7, 24)
(-3.4, 0.5)
j
9.92(5)b
1.61
9.65(2)
7.06
9.73(5)b
1.82
0.64(2)a
59.6
106.1(22)
146
91.1
nph=1
16
11.00
(2, 16, 6)
(2.4, -2.6)
10.25(5)c
0.0218
10.00(2)
1.17
9.80(2)
4.73
0.30(2)a
0.0310
9.10(2)
4.14
144+13b,r
44.6
nph=0
17
9.71
(0, 15, 25)
(1.1, 1.9)
10.53(18)b
0.335
10.17(16)b
0.454
10.07(5)c
4.73
9.60(5)c
2.47
360.4(13)
9.25(20)b
19.1
116+58b
8.95
nph=1
18
12.71
(0, 26, 31)
(0.4, 0.5)
1.52(2)a
0.0680
9.94(2)
0.541
9.28(2)
13.1
144.5(25)
8.52(8)b
0.333
8.97(2)
4.25
19
12.31
(2. 6. 15)
(2.5, -2.6)
10.40(2)
0.112
10.00(2)
0.192
20
11.22
(2, 20, 26)
(1.0, -1.2)
10.51(2)
1.28
9.91(5)c
0.0544
9.83(5)b
8.25
21
13.18
(1, 9, 15)
(0.1, 1.9)
10.30(2)
1.00
9.99(2)
0.621
22
12.68
(0, 19, 22)
(0.2, 1.8)
10.56(2)
0.796
23
14.71
(0, 18, 22)
(0.3, 1.9)
24
12.98
(2, 9, 12)
(3.0, -1.9)
1.35(2)d
8.83e
9.10(2)
7.48e
136+17c
18.0
nph=1
9.77(5)b
0.202
9.10(2)
50.1
119
19.2
nph=2
9.77(2)
3.42
152.1(24)
0.54(2)a
0.0293
95.8(24)
0.44(2)a
16.1
169
95.7
nph=3
10.10(5)c
0.828
9.83(2)
9.28
0.48(2)a
0.0728
9.12(2)
50.8
122
20.3
nph=2
10.40(2)
0.133
9.97(2)
0.0130
1.77(2)a
3.80
9.72(2)
0.283
9.09(5)c
31.9
10.29(2)
0.160
515.1(26)
9.94(2)
6.44
9.72(2)
3.61
0.32(2)a
0.741
0.59(2)a
8.98
25
10.64
(1, 8, 3)
(-3.1, -3.1)
10.37(2)
0.0996
9.96(2)
2.48
9.76(2)k
11.7
0.66(2)a,k
2.80
26
14.60
(0, 27, 0)
(-4.1, 3.1)
10.60(5)b
0.0472
9.95(5)b
0.836
9.78(2)
0.992
71.4(13)
9.58(2)
2.70
>4.91a,c,l
10.2
117+26b
76.8
nph=2
27
16.03
(1, 9, 25)
(-3.1, 0.5)
10.42(2)
0.0260
10.00(2)
0.523
0.36(2)a
8.14
114.6(12)
9.55(5)b
0.669
165.7(22)
>4.64a,c,l
2.76
119+XXp
136
nph=3
28
13.69
(2, 10, 28)
(0.7, -3.0)
10.52(2)
0.568
10.01(2)
0.102
9.77(2)
7.36
>4.34a,c
0.0773
29
13.70
(1, 14, 1)
(-2.4, -3.9)
10.52(2)
0.380
9.97(2)
3.57
9.76(2)
3.73
9.63(5)b
0.0963
363.7(27)
30
13.72
(0,28,24)
(-0.8, 0.9)
10.22(2)
0.0455
ESF=128
0.0142
nph=2
31
j
10.52(2)
(0,29,8)
(-3.3, 2.2)
j
9.98(5)b
0.714
9.75(2)g
3.63
127.1(12)
32
15.24
(1, 20, 8)
(-1.5, 3.2)
10.54(5)b
0.0974
9.97(2)
2.90
>6.26a,c,l
3.97
239.1(22)
9.69(5)b
0.812
363.7(22)
9.04(2)
16.1
33
12.20
(2, 24, 7)
(3.7, 1.0)
10.46(5)b
0.696
9.90(2)
4.07
5.37(5)c
1.44
9.57(2)
0.383
9.13(5)b
9.09
166
90.2
nph=4
34
11.08
(2, 10, 10)
(3.2, -1.5)
10.40(5)b
0.168
9.96(2)
0.219
9.76(2)
5.40
9.60(2)
0.354
173.2(11)
9.10(5)b
16.3
123+52b
49.7
nph=1
35
13.59
(0, 17, 10)
(-1.3, 3.0)
1.99(2)a
0.560
10.00(10)b
2.97
9.28(2)
9.57(5)b
9.08(2)
13.7
3.16
0.419
494.2(13) 126.6(12), 227.0(25)
36
13.96m
(0, 26, 16)
(-1.7, 1.8)
10.60(2)
0.277
10.00(5)b
1.52
9.98(2)
3.48
9.82(2)
0.370
8.96(5)b
4.99
216
13.4
nph=2
37
10.19
(2, 14, 21)
(1.7, -1.8)
10.49(2)
0.207
9.96(2)
0.0202
9.34(5)b
14.9
1.03(2)a
0.782
522.3(14)
9.07(5)c
18.7
149+19
60.3
nph=3
38
13.79
(0, 19, 27)
(0.8, 1.4)
10.42(2)
0.297
9.81(2)n
3.09e
9.80(5)b
1.98
9.08(5)b
7.03
128
137
nph=2
152+22b
40.2
nph=1
0.42(2)a
51.3
84.6(27)
145r
14.2
nph=0
9.09(2)
57.4e
39
11.93
(1, 18, 24)
(-1.8, -0.4)
9.97(2)
0.886e
9.75(2)
1.33
279.6(16)
9.58(2)
0.741
164.4(26)
9.07(2)
16.8
105
2.98
nph=1
40
11.64
(0, 27, 18)
(-1.6, 1.5)
10.67(5)b
0.00730
9.99(2)
0.0884
9.61(2)
4.46
238.7(22)
9.59(2)
0.263
296.1(14)
9.18(5)c
1.10
105+XXq,r
44.5
nph=0
41
14.55
(0, 12, 17)
(0.4, 2.8)
10.40(5)b
0.257
10.01(5)c
2.08
9.57(5)c
6.53e
361.3(21)
9.12(2)
6.76
42
13.71
(2, 5, 24)
(1.3, -3.5)
10.45(5)b
0.350
0.48(2)a
2.92
9.63(2)
1.38
8.90(5)c
6.62
165
76.3
nph=4
a
12.30
(0, 12, 18)
(0.6, 2.7)
9.07(2)
5.54
102+25c
22.9
nph=3
b
15.16
(2, 26, 20)
(-0.2, 0.8)
10.16(2)
0.799
9.76(2)
3.52
238.0(8)
1.01(2)a
1.60
c
12.10
(0, 27, 28)
(-0.2, 0.8)
9.98(2)a
2.64
9.79(2)a
5.26
9.90(5)b
2.83
2.52(2)a
5.54
1075.9(26)
1.69(2)a
0.337
172.1(32)
9.83(2)
2.17
151.7(32)
9.16(5)c
14.0
104
54.0
nph=3
__________________________________________________________________________________________________
Escaping α-particle with only partial energy recorded in DSSSD.
b
Energy reconstructed with origin and terminus in focal plane DSSSDs.
c
Energy reconstructed with origin in DSSSD and terminus in SSSSD.
d
Either 280Rg or 276Mt decay unobserved. Observed α has nearly equal probabilities as 280Rg or 276Mt.
e
Lifetime is (may be) the sum with that from the previous (unobserved) decay.
f
A 660-keV escape α-like event occurs 34.9 seconds later.
g
Either 280Rg or 276Mt decay unobserved. Assignment as 280Rg is >2.0 times more probable than 276Mt.
h
Either 288115 or 284113 decay unobserved. Assignment as 288115 is 4.1 times more probable than 284113.
I
Two more possible 272Bh escape α-events are observed at 47.58 and 48.98 seconds after the 276Mt decay.
j
Recoil was not recorded because of deadtime due to high-rate in another part of the detector.
k
One of 280Rg, 276Mt, or 272Bh was unobserved. Probability that the missing event is 280Rg, 276Mt, or 272Bh are 0.56, 1.04,
and 1.85, respectively.
l
Energy is lower limit only after bias tripped off on SSSD.
m
1.37 MeV event recorded 50 μs after recoil. Energy is uncertain due to summing on tail of recoil pulse.
n 284
113, 280Rg, or 276Mt is missing. Assignment with 284113 missing is 2.6 times more likely than other assignments.
o
Fission energies from the exponential response portion of preamplifier range are approximate values.
p
Prompt TDC recorded in upstream SSSSD strip, but no energy recorded.
q
Prompt TDC recorded in upstream SSSSD strip, but no energy calibration available.
r
Tentative assignment due to low photon multiplicity
a