ENTRY A0948 20240426 A111A0948 0 1 SUBENT A0948001 20240426 A111A0948 1 1 BIB 11 50 A0948 1 2 TITLE Experimental studies of the 249Bk + 48Ca reaction A0948 1 3 including decay properties and excitation function for A0948 1 4 isotopes of element 117, and discovery of the new A0948 1 5 isotope 277Mt. A0948 1 6 AUTHOR (Yu.Ts.Oganessian, F.Sh.Abdullin, C.Alexander, A0948 1 7 J.Binder, R.A.Boll, S.N.Dmitriev, J.Ezold, K.Felker, A0948 1 8 J.M.Gostic, R.K.Grzywacz, J.H.Hamilton, R.A.Henderson, A0948 1 9 M.G.Itkis, K.Miernik, D.Miller, K.J.Moody, A0948 1 10 A.N.Polyakov, A.V.Ramayya, J.B.Roberto, M.A.Ryabinin, A0948 1 11 K.P.Rykaczewski, R.N.Sagaidak, D.A.Shaughnessy, A0948 1 12 I.V.Shirokovsky, M.V.Shumeiko, M.A.Stoyer, N.J.Stoyer, A0948 1 13 V.G.Subbotin, A.M.Sukhov, Yu.S.Tsyganov, V.K.Utyonkov, A0948 1 14 A.A.Voinov, G.K.Vostokin) A0948 1 15 REFERENCE (J,PR/C,87,054621,2013) A0948 1 16 (J,EPJ/CS,66,02073,2014) - same results A0948 1 17 REL-REF (I,A0884001,Yu.Ts.Oganessian+,J,PR/C,83,054315,2011) A0948 1 18 INSTITUTE (4ZZZDUB,1USAORL,1USALRL,1USATEN,1USAVBT,4RUSNIR) A0948 1 19 FACILITY (CYCLO,4ZZZDUB) A0948 1 20 METHOD (TOF) A0948 1 21 PART-DET (A,RSD) A0948 1 22 SAMPLE Half of the obtained 249Bk material,12.7 mg, was A0948 1 23 shipped to the JINR. The 249Bk contained 0.51 mg of A0948 1 24 249Cf, less than 0.45 ng of 252Cf, and no other A0948 1 25 detectable impurities. A0948 1 26 Six arc-shaped targets, each with an area of 5.4 cm**2,A0948 1 27 were made at the Research Institute of Atomic Reactors A0948 1 28 (Dimitrovgrad, Russian Federat.) by depositing BkO(2) A0948 1 29 onto 0.72mg/cm**2 Ti-foils to a thickness of A0948 1 30 0.33 mg/cm**2 of 249Bk. The targets were mounted on theA0948 1 31 perimeter of a disk 12 cm in diameter that was A0948 1 32 rotated at 1700 rpm perpendicular to the beam A0948 1 33 direction. A0948 1 34 DETECTOR (MAGSP) the Dubna Gas-Filled Recoil Separator-DGFRS A0948 1 35 The detection system was modified to increase the A0948 1 36 position granularity of the detectors, which reduces A0948 1 37 the probability of observing sequences of random A0948 1 38 events that mimic decay chains of synthesized nuclei. A0948 1 39 (SISD) Two 6*6 cm**2 silicon detectors each having A0948 1 40 16 strips with position sensitivity in the vertical A0948 1 41 direction. These detectors were surrounded by six A0948 1 42 similar 6*6 cm**2 side detectors without position A0948 1 43 sensitivity. Behind the focal-plane detectors, which A0948 1 44 had a thickness of 0.3 mm, a pair of veto detectors A0948 1 45 similar to the side detectors was mounted for the A0948 1 46 detection and rejection of signals from high-energy A0948 1 47 long-range charged particles. A0948 1 48 HISTORY (20130604C) SB A0948 1 49 (20170211A) SD: REACTION code update in Subents 002-003A0948 1 50 (20240426U) SD: Ref. added (EPJ/CS,66,02073,2014). A0948 1 51 Small correction in Subents 005, 006. A0948 1 52 ENDBIB 50 0 A0948 1 53 NOCOMMON 0 0 A0948 1 54 ENDSUBENT 53 0 A0948 199999 SUBENT A0948002 20170211 A087A0948 2 1 BIB 6 11 A0948 2 2 REACTION (97-BK-249(20-CA-48,3N)117-TS-294,,SIG) A0948 2 3 DECAY-DATA (117-TS-294,,A,10810.,,A,10967.) A0948 2 4 Alpha decay (10.81-10.97 MeV) A0948 2 5 Half-life is 50+-60,18 msec A0948 2 6 This is the average alpha energy from 3/3 events A0948 2 7 MISC-COL (MISC).Excitation energy of the compound nucleus. A0948 2 8 ERR-ANALYS (DATA-ERR) No information about source of uncertaintiesA0948 2 9 STATUS (TABLE).Table data were received from Dr.V.K.Utyonkov A0948 2 10 for fig.4 of J,PR/C,87,054621,2013 A0948 2 11 HISTORY (20170211A) SD: SF4=117-*-294 -> 117-TS-294 in A0948 2 12 REACTION code and DECAY-DATA. A0948 2 13 ENDBIB 11 0 A0948 2 14 NOCOMMON 0 0 A0948 2 15 DATA 6 3 A0948 2 16 EN DATA +DATA-ERR -DATA-ERR DATA-MAX MISC A0948 2 17 MEV PB PB PB PB MEV A0948 2 18 243.7 0.7276 1.6730 0.6019 32.55A0948 2 19 246.8 1.1045 1.0744 0.6011 35.13A0948 2 20 251.7 0.315 39.25A0948 2 21 ENDDATA 5 0 A0948 2 22 ENDSUBENT 21 0 A0948 299999 SUBENT A0948003 20170211 A087A0948 3 1 BIB 6 12 A0948 3 2 REACTION (97-BK-249(20-CA-48,4N)117-TS-293,,SIG) A0948 3 3 DECAY-DATA (117-TS-293,,A,10598.,,A,10900.,,A,10914.,,A,11114.,, A0948 3 4 A,11142.) A0948 3 5 Alpha decay (10.60-11.20 MeV) A0948 3 6 Half-life is 22+-8,4 msec A0948 3 7 This is the average alpha energy from 15/15 events A0948 3 8 MISC-COL (MISC).Excitation energy of the compound nucleus. A0948 3 9 ERR-ANALYS (DATA-ERR) No information about source of uncertaintiesA0948 3 10 STATUS (TABLE).Table data were received from Dr.V.K.Utyonkov A0948 3 11 for fig.4 of J,PR/C,87,054621,2013 A0948 3 12 HISTORY (20170211A) SD: SF4=117-*-293 -> 117-TS-293 in A0948 3 13 REACTION code and DECAY-DATA. A0948 3 14 ENDBIB 12 0 A0948 3 15 NOCOMMON 0 0 A0948 3 16 DATA 6 4 A0948 3 17 EN DATA +DATA-ERR -DATA-ERR DATA-MAX MISC A0948 3 18 MEV PB PB PB PB MEV A0948 3 19 246.8 0.587 35.13A0948 3 20 251.7 1.542 0.658 0.479 39.25A0948 3 21 255.7 2.370 2.3056 1.290 42.58A0948 3 22 259.8 1.964 1.9105 1.0689 46.02A0948 3 23 ENDDATA 6 0 A0948 3 24 ENDSUBENT 23 0 A0948 399999 SUBENT A0948004 20170211 A087A0948 4 1 BIB 4 6 A0948 4 2 REACTION (97-BK-249(20-CA-48,5N)117-TS-292,,SIG) A0948 4 3 MISC-COL (MISC).Excitation energy of the compound nucleus. A0948 4 4 STATUS (TABLE).Table data were received from Dr.V.K.Utyonkov A0948 4 5 for fig.4 of J,PR/C,87,054621,2013 A0948 4 6 HISTORY (20170211A) SD: SF4=117-*-292 -> 117-TS-292 in A0948 4 7 REACTION code. A0948 4 8 ENDBIB 6 0 A0948 4 9 NOCOMMON 0 0 A0948 4 10 DATA 3 1 A0948 4 11 EN DATA-MAX MISC A0948 4 12 MEV PB MEV A0948 4 13 259.8 1.2053 46.02 A0948 4 14 ENDDATA 3 0 A0948 4 15 ENDSUBENT 14 0 A0948 499999 SUBENT A0948005 20240426 A111A0948 5 1 BIB 6 13 A0948 5 2 REACTION (97-BK-249(20-CA-48,3N)117-TS-294,,SIG,,AV) A0948 5 3 MISC-COL (MISC) The excitation energy of the compound nucleus. A0948 5 4 DECAY-DATA (117-TS-294,,A,10960.,,A,10967.) A0948 5 5 Alpha decay (10.81-10.97 MeV)- A0948 5 6 Half-life is 50(+60/-18) msec - Error bars correspond A0948 5 7 to 68% confidence level. A0948 5 8 This is the average alpha energy from 3/3 events A0948 5 9 ERR-ANALYS (DATA-ERR) No information about source of uncertaintiesA0948 5 10 STATUS (TABLE,,Yu.Ts.Oganessian+,J,PR/C,87,054621,2013) abstr.A0948 5 11 (DEP,A0948002) A0948 5 12 HISTORY (20170211A) SD: SF4=117-*-294 -> 117-TS-294 in A0948 5 13 REACTION code and DECAY-DATA. A0948 5 14 (20240426U) SD: STATUS updated. A0948 5 15 ENDBIB 13 0 A0948 5 16 NOCOMMON 0 0 A0948 5 17 DATA 7 1 A0948 5 18 EN-MIN EN-MAX DATA +DATA-ERR -DATA-ERR MISC-MIN A0948 5 19 MISC-MAX A0948 5 20 MEV MEV PB PB PB MEV A0948 5 21 MEV A0948 5 22 243.7 259.8 1.1 1.2 0.6 30.4 A0948 5 23 48.3 A0948 5 24 ENDDATA 6 0 A0948 5 25 ENDSUBENT 24 0 A0948 599999 SUBENT A0948006 20240426 A111A0948 6 1 BIB 6 14 A0948 6 2 REACTION (97-BK-249(20-CA-48,4N)117-TS-293,,SIG,,AV) A0948 6 3 DECAY-DATA (117-TS-293,,A,10598.,,A,10900.,,A,10914.,,A,11114.,, A0948 6 4 A,11142.) A0948 6 5 Alpha decay (10.60-11.20 MeV) A0948 6 6 Half-life is 27(+12/-6) msec - Error bars correspond A0948 6 7 to 68% confidence level. A0948 6 8 This is the average alpha energy from 10/10 events A0948 6 9 MISC-COL (MISC) The excitation energy of the compound nucleus. A0948 6 10 ERR-ANALYS (DATA-ERR) No information about source of uncertaintiesA0948 6 11 STATUS (TABLE,,Yu.Ts.Oganessian+,J,PR/C,87,054621,2013) abstr.A0948 6 12 (DEP,A0948003) A0948 6 13 HISTORY (20170211A) SD: SF4=117-*-293 -> 117-TS-293 in A0948 6 14 REACTION code and DECAY-DATA. A0948 6 15 (20240426U) SD: STATUS updated. A0948 6 16 ENDBIB 14 0 A0948 6 17 NOCOMMON 0 0 A0948 6 18 DATA 7 1 A0948 6 19 EN-MIN EN-MAX DATA +DATA-ERR -DATA-ERR MISC-MIN A0948 6 20 MISC-MAX A0948 6 21 MEV MEV PB PB PB MEV A0948 6 22 MEV A0948 6 23 243.7 259.8 2.4 3.3 1.4 30.4 A0948 6 24 48.3 A0948 6 25 ENDDATA 6 0 A0948 6 26 ENDSUBENT 25 0 A0948 699999 ENDENTRY 6 0 A094899999999