ENTRY D6214 20140417 D094D621400000001 SUBENT D6214001 20140417 D094D621400100001 BIB 11 38 D621400100002 TITLE Direct observation of the 4+ to 2+ gamma transition D621400100003 in 8Be D621400100004 AUTHOR (V.M.Datar, Suresh Kumar, D.R.Chakrabarty, V.Nanal, D621400100005 E.T.Mirgule, A.Mitra, H.H.Oza) D621400100006 INSTITUTE (3INDTRM,3INDTAT) D621400100007 REFERENCE (J,PRL,94,122502,2005) D621400100008 #doi:10.1103/PhysRevLett.94.122502 D621400100009 FACILITY (VDGT,3INDTRM) 14UD BARC-TIFR Pelletron. D621400100010 SAMPLE A helium gas target of purity > 99.9% at 0.8 bar D621400100011 pressure. D621400100012 DETECTOR (BGO) Gamma rays were detected in two arrays, each D621400100013 having seven close packed hexagonal bismuth germanate D621400100014 scintillation detectors placed ~ 3 cm above and below D621400100015 the target. The upper BGO detectors had a thickness D621400100016 of 76 mm and a face to face width of 56 mm while the D621400100017 corresponding numbers for the lower set were 64 and D621400100018 56 mm. D621400100019 (SI) The two alpha particles were detected in an D621400100020 array of six silicon (Si) p-i-n diodes (9 mm x 9 mm x D621400100021 500 mu-m). These were placed at forward angles in a D621400100022 close packed configuration. A 300 mu-m thick Si D621400100023 detector was also placed at ~ 110 degree with respect D621400100024 to the beam and the spectra were recorded separately D621400100025 to monitor the impurities (mainly air) in the helium D621400100026 gas via their corresponding elastic peaks. D621400100027 METHOD (COINC) Detection of two alphas and gamma in D621400100028 coincidence. D621400100029 ERR-ANALYS (ERR-S) Statistical uncertainty D621400100030 (ERR-SYS) The systematic error includes the error due D621400100031 to the uncertainty in beam position, the choice of D621400100032 the fitting procedure and the subtracted air D621400100033 background. D621400100034 (ERR-T) The errors, when added in quadrature, are 33% D621400100035 and 67%, for on and off resonance energies D621400100036 respectively. D621400100037 STATUS (TABLE) Text (p122502-2) of Phys.Rev.Lett.94(2005) D621400100038 122502. D621400100039 HISTORY (20140417C) BL D621400100040 ENDBIB 38 0 D621400100041 NOCOMMON 0 0 D621400100042 ENDSUBENT 41 0 D621400199999 SUBENT D6214002 20140417 D094D621400200001 BIB 3 4 D621400200002 REACTION (2-HE-4(A,G)4-BE-8,PAR,SIG) D621400200003 PART-DET (A,G) D621400200004 LEVEL-PROP (4-BE-8,E-LVL=11.4,SPIN=4.,PARITY=+1.) D621400200005 (4-BE-8,E-LVL=3.04,SPIN=2.,PARITY=+1.) D621400200006 ENDBIB 4 0 D621400200007 COMMON 2 3 D621400200008 E-LVL-INI E-LVL-FIN D621400200009 MEV MEV D621400200010 11.4 3.04 D621400200011 ENDCOMMON 3 0 D621400200012 DATA 5 2 D621400200013 EN DATA ERR-S ERR-SYS ERR-T D621400200014 MEV NB NB NB PER-CENT D621400200015 22.4 165. 41. 35. 33. D621400200016 26.5 39. 25. 7. 67. D621400200017 ENDDATA 4 0 D621400200018 ENDSUBENT 17 0 D621400299999 ENDENTRY 2 0 D621499999999