ENTRY M0690 20210620 M113M069000000001 SUBENT M0690001 20210620 M113M069000100001 BIB 15 71 M069000100002 TITLE Partial photoneutron cross sections for the isomeric M069000100003 state 180Ta-m. M069000100004 AUTHOR (S.Goko,H.Utsunomiya,S.Goriely,A.Makinaga,T.Kaihori, M069000100005 S.Hohara,H.Akimune,T.Yamagata,Y.-W.Lui,H.Toyokawa, M069000100006 A.J.Koning,S.Hilaire) M069000100007 REFERENCE (J,PRL,96,192501,2006) M069000100008 INSTITUTE (2JPNKON,2BLGBRU,1USATAM,2JPNAIS,2NEDNRG,2FR BRC) M069000100009 FACILITY (ESTRG,2JPNAIS) Electron storage ring Tsukuba M069000100010 Electron Ring for Accelerating and Storage at the M069000100011 National Institute of Advanced Industrial Science and M069000100012 Technology. M069000100013 INC-SOURCE (LCS) Quasimonochromatic gamma-rays produced by means M069000100014 of laser Compton backscattering (LCS), lambda = 532 M069000100015 nm laser photons were used. The energy spread of the M069000100016 LCS gamma-ray beam was 0.8 - 1.6 MeV in full width at M069000100017 half maximum. M069000100018 SAMPLE Ten 1 cm x 1 cm 100 micron-thick Ta and Au foils, M069000100019 99.95%. M069000100020 METHOD T(RINGR) Direct neutron counting measurement of total M069000100021 photoneutron cross section using 20 3He proportional M069000100022 counters (three concentric rings of 4, 8, and 8 M069000100023 detectors) embedded at 38, 70 and 100 mm, M069000100024 respectively from the axis in a polyethylene M069000100025 moderator. M069000100026 G(ACTIV) Photoactivation measurement of partial cross M069000100027 section for the ground state in 181Ta. M069000100028 DETECTOR T(PROPC) 3He proportional counters to detect neutron. M069000100029 (NAICR) to measure the intensity of the LCS gamma-rays.M069000100030 G(HPGE) Hyperpure Germanium detector of planer type M069000100031 with active volume of 114 cm**3 to measure the energy M069000100032 distribution of the LCS gamma-rays. M069000100033 ANALYSIS TDirect measurement. M069000100034 GDirect measurement. M069000100035 M 180Ta is the one and only naturally occurring isomer. M069000100036 It is present in nature in an isomeric state at M069000100037 excitation energy of 75.3 keV with the spin-parity 9-. M069000100038 The isomer has the half-life greater than M069000100039 1.2 x 10**15 yr, in contrast to the short-lived ground M069000100040 state (1+; 8.152 h) in 180Ta. Therefore the subtractingM069000100041 procedure was used: SIG-m = (SIG-tot) - (SIG-gs). MM069000100042 ERR-ANALYS (ERR-S) Statistical errors. M069000100043 T(ERR-SYS) The systematic uncertainty is 4.4% (3% for M069000100044 initial photon flux and 3.2% for neutron detection M069000100045 efficiency). M069000100046 G(ERR-SYS) The systematic uncertainty for the ground M069000100047 state cross section is 4.6%. M069000100048 M(ERR-SYS) The systematic uncertainties were obtained M069000100049 using the procedure specially described in text. M069000100050 COMMENT Photoneutron cross sections for 181Ta(g,n) 180Ta-m M069000100051 were determined from simultaneous measurements of M069000100052 total cross sections (SIG-tot) and ground-state cross M069000100053 sections (SIG-gs) for 180Ta in photodisintegration of M069000100054 181Ta with laser Compton backscattering gamma-rays. M069000100055 Techniques of direct neutron counting and M069000100056 photoactivation were used for measurement of SIG-tot M069000100057 and SIG-gs, respectively. The partial cross sections M069000100058 for the isomeric state serves as a novel probe of M069000100059 nuclear level density of 180Ta. Implications for the M069000100060 p- and s- processes nucleosynthesis of 180Ta-m are M069000100061 given. M069000100062 STATUS (TABLE) Table 2 from Phys.Rev.Lett.,96(2006)192501 M069000100063 (APRVD) The date were approved by A.Makinaga. M069000100064 CRITIQUE There is mistake in the data head of first column of M069000100065 the Table 2: Eg(MeV) must be, not Eg(mb). M069000100066 HISTORY (20060901C) Entry have been compiled at the MSU SINP M069000100067 CDFE by V.Varlamov. M069000100068 (20100209A) Corrected: INC-SOURCE, ERR-ANALYS, M069000100069 CRITIQUE, COMMON deleted, DATA substituted. M069000100070 (20170330A) Corrected by V.Varlamov: INC-SOURCE. M069000100071 (20210620U) Corrected by SD and VV: Corrections in all M069000100072 SUBENTs. M069000100073 ENDBIB 71 0 M069000100074 NOCOMMON 0 0 M069000100075 ENDSUBENT 74 0 M069000199999 SUBENT M0690002 20210620 M113M069000200001 BIB 4 10 M069000200002 REACTION T(73-TA-181(G,N)73-TA-180,,SIG) M069000200003 G(73-TA-181(G,N)73-TA-180-G,,SIG) M069000200004 M(73-TA-181(G,N)73-TA-180-M,,SIG) M069000200005 DECAY-DATAG(73-TA-180-G,8.152HR,XR,55.79,0.331,XR,54.61,0.192) M069000200006 M(73-TA-180-M,1.2E15YR) M069000200007 COMMENT Systematical uncertainties T(ERR-SYS) and G(ERR-SYS) M069000200008 in mb were calculated from correspondent data in M069000200009 percent from text and cross section data from the M069000200010 table by compiler. M069000200011 HISTORY (20210620U) Corrected by SD and VV: DECAY-DATA. M069000200012 ENDBIB 10 0 M069000200013 NOCOMMON 0 0 M069000200014 DATA 10 6 M069000200015 EN DATA TERR-S TERR-SYS TDATA GERR-S GM069000200016 ERR-SYS GDATA MERR-S MERR-SYS M M069000200017 MEV MB MB MB MB MB M069000200018 MB MB MB MB M069000200019 9.2 48. .9 2.11 45. 3.1 M069000200020 2.07 3. 3.2 .7 M069000200021 9.7 73. .7 3.21 66. 3.8 M069000200022 3.04 6. 3.9 .9 M069000200023 10.5 109. 1.3 4.8 103. 2.6 M069000200024 4.74 6. 2.9 1.6 M069000200025 10.9 143. 1.7 6.29 130. 3.7 M069000200026 5.98 13. 4.1 2. M069000200027 11.5 234. 1.8 10.3 219. 4.9 M069000200028 10.07 15. 5.2 3.4 M069000200029 12.3 383. 27. 16.85 329. 10. M069000200030 15.13 54. 29. 5. M069000200031 ENDDATA 16 0 M069000200032 ENDSUBENT 31 0 M069000299999 ENDENTRY 2 0 M069099999999