ENTRY C0508 19990308 0000C050800000001 SUBENT C0508001 19990308 0000C050800100001 BIB 15 49 C050800100002 INSTITUTE (1USAHPE,1USANOT,1USAMHG,1USAISB) C050800100003 REFERENCE (J,PR/C,58,3442,199812) C050800100004 AUTHOR (P.A.DEYOUNG,B.HUGHEY,P.L.JOLIVETTE,G.F.PEASLEE, C050800100005 J.J.KOLATA,V.GUIMARAES,D.PETERSON,S.SANTI,H.C.GRIFFIN, C050800100006 J.A.ZIMMERMAN,J.D.HINNEFELD) C050800100007 TITLE Fusion of a neutron skin nucleus: The 209Bi(4He,4n) C050800100008 reaction. C050800100009 FACILITY (VDGT,1USANOT) Three-stage Van de Graaf accelerator C050800100010 facility combined with a large supercondacting C050800100011 solenoid magnet (the TwinSol system) for collecting C050800100012 and focusing the secondary 6He. C050800100013 INC-SOURCE Radioactive 6He beam produced by the 7Li+9Be reaction. C050800100014 Beam passed through a Au monitor, then a series of C050800100015 alternating Mylar degrader foils and targets. C050800100016 Due to energy loss in the degrader foils and targets, C050800100017 incident energy range seen by Bi targets in target C050800100018 stack spanned 20.0 - 31.6 MeV. C050800100019 SAMPLE Stack of 16 209Bi targets backed with 0.825 mg/cm**2 C050800100020 Mylar, nominal thickness 1 mg/cm**2, alternating C050800100021 with removable Mylar degraders (each 0.825 mg/cm**2). C050800100022 DETECTOR (SILI) 32 Si surface barrier detectors, each 150 C050800100023 microns thick and 3 cm**2. C050800100024 METHOD (ACTIV,EXTB,STTA) C050800100025 Bi targets were irradiated for approximately 17 h C050800100026 and then quickly transfered to the off-line counting C050800100027 system (each of the 16 targets was placed between C050800100028 two closely spaced detectors so that total solid C050800100029 angle subtended by the detectors for each target was C050800100030 about 60 % of 4pi). The irradiated targets were C050800100031 counted for approximately 20 h. C050800100032 Before irradiation, each of the targets was also C050800100033 counted for 24 h to establish the background alpha- C050800100034 activity levels. C050800100035 DECAY-DATA (85-AT-211,7.2HR,A) C050800100036 MONITOR Beam monitored by 6He scattering from Au foils. C050800100037 CORRECTION Corrected for C050800100038 . background C050800100039 . solid angle, C050800100040 . finite counting time, C050800100041 . time to transfer the targets from the on-line C050800100042 scattering chamber to the off-line counting system C050800100043 (about 45 min), C050800100044 . decay of 211At during the irradiation. C050800100045 ADD-RES (COMP) The result, for energies above the Coulomb C050800100046 barrier, are compared the statistical model predictionC050800100047 using the code PACE. C050800100048 STATUS Data received by email from P.A. DeYoung, Jan. 1999. C050800100049 No reply to author proof. C050800100050 HISTORY (19990202C) VV C050800100051 ENDBIB 49 0 C050800100052 NOCOMMON 0 0 C050800100053 ENDSUBENT 52 0 C050800199999 SUBENT C0508002 19990202 0000C050800200001 BIB 3 12 C050800200002 REACTION (83-BI-209(2-HE-6,4N)85-AT-211,,SIG) C050800200003 ERR-ANALYS (ERR-S) Statistical uncertainties given. C050800200004 Systematic uncertainty about 10%, mainly due to the C050800200005 uncertainties in the target thickness and in the C050800200006 ratio of 6He to primary beam current. C050800200007 (EN-ERR) Estimated systematic errors based on C050800200008 variation in the measured energies in the monitors C050800200009 and measurements with detectors in the direct C050800200010 secondary beam. C050800200011 FLAG (1.) The result of the 1st independent measurement. C050800200012 (2.) The result of the 2nd independent measurement. C050800200013 (3.) The result of the 3rd independent measurement. C050800200014 ENDBIB 12 0 C050800200015 COMMON 1 3 C050800200016 EN-ERR C050800200017 KEV C050800200018 350. C050800200019 ENDCOMMON 3 0 C050800200020 DATA 4 38 C050800200021 EN-CM DATA ERR-S FLAG C050800200022 MEV MB MB NO-DIM C050800200023 23.46625 13.16156 29.12708 3. C050800200024 23.72872 12.29056 24.79871 1. C050800200025 23.84537 18.70074 32.79122 2. C050800200026 24.15644 67.41570 29.01987 3. C050800200027 24.40918 44.86489 25.08749 1. C050800200028 24.53555 95.28292 34.34401 2. C050800200029 24.83690 66.08394 29.74006 3. C050800200030 25.07020 71.38523 24.93251 1. C050800200031 25.20630 121.5745 32.75718 2. C050800200032 25.48820 135.4213 30.12674 3. C050800200033 25.72150 140.8095 25.58860 1. C050800200034 25.85760 169.0125 33.09032 2. C050800200035 26.13950 194.6767 30.50425 3. C050800200036 26.37280 218.4666 26.80017 1. C050800200037 26.48945 276.2107 36.12514 2. C050800200038 26.49917 217.6884 30.88946 3. C050800200039 26.87829 330.8286 33.10210 3. C050800200040 27.01438 319.7360 28.40135 1. C050800200041 27.11159 430.8486 38.34439 2. C050800200042 27.51015 512.4175 37.25449 3. C050800200043 27.65596 449.6178 30.78845 1. C050800200044 27.72401 521.3124 39.23075 2. C050800200045 27.89898 568.6805 37.34465 3. C050800200046 28.27810 651.4371 36.14830 1. C050800200047 28.34614 782.5618 46.09311 2. C050800200048 28.52112 794.6555 43.79467 3. C050800200049 28.90024 867.9424 41.76904 1. C050800200050 28.90024 877.9058 45.37328 3. C050800200051 28.94884 901.4763 48.50236 2. C050800200052 29.50293 1212.620 52.98569 1. C050800200053 29.50293 1258.224 58.27995 3. C050800200054 29.54181 1172.763 58.58526 2. C050800200055 30.09591 1164.754 51.03256 1. C050800200056 30.09591 1602.903 68.63051 3. C050800200057 30.12507 1285.494 60.81932 2. C050800200058 30.68888 1495.605 61.54376 1. C050800200059 30.68888 1724.134 72.07406 3. C050800200060 30.69860 1637.253 71.41364 2. C050800200061 ENDDATA 40 0 C050800200062 ENDSUBENT 61 0 C050800299999 ENDENTRY 2 0 C050899999999