ENTRY 23191 20151013 22452319100000001 SUBENT 23191001 20151013 22452319100100001 BIB 10 52 2319100100002 TITLE First Measurements with the BEta deLayEd Neutron 2319100100003 Detector (BELEN-20) at JYFLTRAP . 2319100100004 AUTHOR (M.B.Gomez-Hornillos, J.Rissanen, J.L.Tain, A.Algora, 2319100100005 D.Cano-Ott, J.Agramunt, V.Gorlychev, R.Caballero, 2319100100006 T.Martinez,L.Achouri, J.Aeysto, G.Cortes, V.V.Elomaa, 2319100100007 T.Eronen, A.Garcia,J.Hakala, A.Jokinen, P.Karvonen, 2319100100008 V.S.Kolhinen,I.Moore,M.Parlog,H.Penttilae,Z.Podolyak, 2319100100009 C.Pretel, M.Reponen, V.Sonnenschein, E.Valencia) 2319100100010 INSTITUTE (2SF JYV) J.Rissanen,J.Aeysto,V.V.Elomaa,T.Eronen, 2319100100011 J.Hakala, A.Jokinen, P.Karvonen,V.S.Kolhinen,I.Moore, 2319100100012 H.Penttilae,M.Reponen, V.Sonnenschein. 2319100100013 (2SPNUPC) M.B.Gomez-Hornillos,V.Gorlychev, R.Caballero,2319100100014 G.Cortes, C.Pretel. 2319100100015 (2SPNVAL) Instituto de Fisica Corpuscular, Valencia, 2319100100016 Spain. J.L.Tain, A.Algora, J.Agramunt, E.Valencia. 2319100100017 (2SPNPCM) D.Cano-Ott,T.Martinez,A.Garcia. 2319100100018 (2FR CAE) L.Achouri,M.Parlog. 2319100100019 (2UK SUR) Z.Podolyak. 2319100100020 REFERENCE (J,JP/CS,312,052008,2011) 2319100100021 #doi:10.1088/1742-6596/312/5/052008 2319100100022 DETECTOR (HE3SP) Matrix of polyethylene with 20 3He counters 2319100100023 arranged in two concentric rings around the detector 2319100100024 cavity. The detection of the neutrons is achieved via 2319100100025 the detection of the charged particles produced in the 2319100100026 reaction 3He + n -> 3H + p + 763.7 keV. 2319100100027 According to MCNPX simulations, the neutron detection 2319100100028 efficiency 30% in the neutron energy range 1keV-1MeV. 2319100100029 (SISD) Si detector (27 mm diameter and 910 microm thick2319100100030 to detect beta-particles). 2319100100031 (GE) Ge detector for gamma-ray detection. 2319100100032 BELEN-20 detection efficiency obtained using 88Br and 2319100100033 95Rb as calibration: 2319100100034 Isotope Pn(%) Efficiency 2319100100035 88Br 6.58+-0.18 27.6+-0.7 2319100100036 95Rb 8.73+-0.20 26.6+-0.8 2319100100037 Average efficiency for BELEN-20 is (27.1+-0.8)%. 2319100100038 REL-REF (R,,G.Rudstam+,J,AND,53,1,1993) Data of Pn used for 2319100100039 calibration. 2319100100040 EXP-YEAR (2009) November 2009 - first experiment. 2319100100041 FACILITY (FRS,2SF JYV) Ion Guide Isotope Separator On-Line 2319100100042 (IGISOL) facility with a 30 MeV deuteron beam 2319100100043 impinging on a natural uranium target - to produce 2319100100044 88Br, 94,95Rb and 138I isotopes. Subsequently, the 2319100100045 double Penning trap setup JYFLTRAP was used to prepare 2319100100046 a monoisotopic beam which was implanted on a movable 2319100100047 tape placed inside the neutron detector. The 2319100100048 radioactivity was accumulated during a period of 2319100100049 3 T1/2, the measurement was extended up to 10 T1/2. 2319100100050 METHOD (COINC) Beta-neutron coincidences. 2319100100051 HISTORY (20130303C) M.M. 2319100100052 (20151013A) SD: In Subent 002 data units were changed 2319100100053 according to MEMO WP2015-25. 2319100100054 ENDBIB 52 0 2319100100055 NOCOMMON 0 0 2319100100056 ENDSUBENT 55 0 2319100199999 SUBENT 23191002 20151013 22452319100200001 BIB 6 16 2319100200002 REACTION 1(37-RB-94(0,B-)38-SR-94,,PN) 2319100200003 2(53-I-138(0,B-)54-XE-138,,PN) 2319100200004 ANALYSIS The neutron emission rate (Pn) is obtained with the 2319100200005 formula Pn=Nbn/(EPSn*Nb), where 2319100200006 Nb - the number of beta counts due to the decay of the 2319100200007 mother nucleus, 2319100200008 Nbn - the number of beta-neutron coincidences, 2319100200009 EPSn - the detector efficiency. 2319100200010 REL-REF (A,,G.Rudstam+,J,AND,53,1,1993) 2319100200011 (A,,B.Pfeiffer+,J,PNE,41,39,2002) 2319100200012 STATUS (TABLE) Table 3 of J,JP/CS,312,052008,2011. 2319100200013 (PRELM) Data of preliminary analysis. 2319100200014 ERR-ANALYS (DATA-ERR) No information about source of error 2319100200015 HISTORY (20151013A) SD: Data units were changed according to 2319100200016 MEMO WP2015-25 (PC/DECAY -> NO-DIM). SF4 added to 2319100200017 REACTION code. 2319100200018 ENDBIB 16 0 2319100200019 NOCOMMON 0 0 2319100200020 DATA 4 1 2319100200021 DATA 1DATA-ERR 1DATA 2DATA-ERR 2 2319100200022 NO-DIM NO-DIM NO-DIM NO-DIM 2319100200023 10.28 0.31 5.32 0.2 2319100200024 ENDDATA 3 0 2319100200025 ENDSUBENT 24 0 2319100299999 ENDENTRY 2 0 2319199999999