NEUTRINO SPIN-FLIP EFFECTS IN COLLAPSING STARS

被引:35
作者
ATHAR, H
PELTONIEMI, JT
SMIRNOV, AY
机构
[1] SCUOLA INT SUPER STUDI AVANZATI,I-34100 TRIESTE,ITALY
[2] IST NAZL FIS NUCL,I-34100 TRIESTE,ITALY
[3] RUSSIAN ACAD SCI,INST NUCL RES,MOSCOW,RUSSIA
来源
PHYSICAL REVIEW D | 1995年 / 51卷 / 12期
关键词
D O I
10.1103/PhysRevD.51.6647
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study the spin-flavor transitions of neutrinos, e-, e-, etc., in the magnetic fields of a collapsing star. For the neutrino mass squared difference m2(10-10 10) eV2 the transitions take place in an almost isotopically neutral region of the star, where the effective matter density is suppressed up to 3 4 orders of magnitude. This suppression is shown to increase the sensitivity of the neutrino burst studies to the magnetic moment of the neutrino, by 1.5 2 orders of magnitude, and for realistic magnetic field the observable effects may exist for (2 3)×10-14 B (B is the Bohr magneton). In the isotopically neutral region the jumps of the effective potential exist which influence the probabilities of transitions. The experimental signatures of the spin-flavor transitions are discussed. In particular, in the case of direct mass hierarchy, the spin-flip effects result in a variety of modifications of the e spectrum. Taking this into account, we estimate the upper bounds on B from the SN 1987A data. In the isotopically neutral region the effects of the possible twist of the magnetic field on the way of neutrinos can be important, inducing distortion of the neutrino energy spectra and further increasing the sensitivity to B. However, if the total rotation angle is restricted by <, the absolute change of probabilities is small. © 1995 The American Physical Society.
引用
收藏
页码:6647 / 6662
页数:16
相关论文
共 42 条
[1]   ON THE EVENT OBSERVED IN THE MONT-BLANC UNDERGROUND NEUTRINO OBSERVATORY DURING THE OCCURRENCE OF SUPERNOVA 1987-ALPHA [J].
AGLIETTA, M ;
BADINO, G ;
BOLOGNA, G ;
CASTAGNOLI, C ;
CASTELLINA, A ;
DADYKIN, VL ;
FULGIONE, W ;
GALEOTTI, P ;
KALCHUKOV, FF ;
KORTCHAGUIN, B ;
KORTCHAGUIN, PV ;
MALGUIN, AS ;
RYASSNY, VG ;
RYAZHSKAYA, OG ;
SAAVEDRA, O ;
TALOCHKIN, VP ;
TRINCHERO, G ;
VERNETTO, S ;
ZATSEPIN, GT ;
YAKUSHEV, VF .
EUROPHYSICS LETTERS, 1987, 3 (12) :1315-1320
[2]   THE MOST POWERFUL SCINTILLATOR SUPERNOVAE DETECTOR - LVD [J].
AGLIETTA, M ;
ALPAT, B ;
ALYEA, ED ;
ANTONIOLI, P ;
ANZIVINO, G ;
BADINO, G ;
BAN, Y ;
BARI, G ;
BASILE, M ;
BENELLI, A ;
BEREZINSKY, VS ;
BERGAMASCO, L ;
BIANCO, S ;
BIZZETTI, A ;
BRUNI, G ;
CAO, Y ;
ROMEO, GC ;
CASACCIA, R ;
CASTAGNOLI, C ;
CASTELLINA, A ;
CHEN, K ;
CHEN, R ;
CHINELLATO, JA ;
CIFARELLI, L ;
CINI, G ;
CONG, S ;
CONTIN, A ;
DADIKIN, VL ;
DARDO, M ;
DESILVA, A ;
DEUTSCH, M ;
DOSSANTOS, LG ;
ENIKEEV, RI ;
FABBRI, FL ;
FULGIONE, W ;
GALEOTTI, P ;
GHIA, PL ;
GIUSTI, P ;
GRIANTI, F ;
GU, S ;
HAFEN, ES ;
HARIDAS, P ;
IACOBUCCI, G ;
INOUE, N ;
KHALCHUKOV, FF ;
KOROLKOVA, EV ;
KORTCHAGUIN, PV ;
KORTCHAGUIN, VB ;
KUDRYAVTSEV, VA ;
LANDI, G .
NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS, 1992, 105 (12) :1793-1804
[3]   NEUTRINOS WITH MIXING IN TWISTING MAGNETIC-FIELDS [J].
AKHMEDOV, EK ;
PETCOV, ST ;
SMIRNOV, AY .
PHYSICAL REVIEW D, 1993, 48 (05) :2167-2181
[4]  
AKHMEDOV EK, 1988, SOV J NUCL PHYS+, V48, P382
[6]   IMPLICATIONS OF MAJORANA NEUTRINO TRANSITION MAGNETIC-MOMENTS FOR NEUTRINO SIGNALS FROM SUPERNOVAE [J].
AKHMEDOV, EK ;
BEREZHIANI, ZG .
NUCLEAR PHYSICS B, 1992, 373 (02) :479-497
[7]  
AKHMEDOV EK, 1989, SOV PHYS JEJTP, V68, P676
[8]  
AKHMEDOV EK, IN PRESS PHYS LETT B
[9]   DETECTION OF THE NEUTRINO SIGNAL FROM SN 1987A IN THE LMC USING THE INR BAKSAN UNDERGROUND SCINTILLATION TELESCOPE [J].
ALEXEYEV, EN ;
ALEXEYEVA, LN ;
KRIVOSHEINA, IV ;
VOLCHENKO, VI .
PHYSICS LETTERS B, 1988, 205 (2-3) :209-214
[10]   THE LARGE-VOLUME DETECTOR (LVD) - A MULTIPURPOSE UNDERGROUND DETECTOR AT GRAN-SASSO [J].
BARI, G ;
BASILE, M ;
BRUNI, G ;
ROMEO, GC ;
CASTELVETRI, A ;
CIFARELLI, L ;
CONTIN, A ;
DELPAPA, C ;
GIUSTI, P ;
IACOBUCCI, G ;
MACCARRONE, G ;
MASSAM, T ;
NANIA, R ;
OSHEA, V ;
PALMONARI, F ;
PEROTTO, E ;
SARTORELLI, G ;
WILLUTZKY, M ;
ARYAL, M ;
DE, K ;
SHAPIRO, AM ;
WIDGOFF, M ;
CHINCELLATO, JA ;
DOBRIGKEITCHINCELLATO, C ;
FAUTH, AC ;
TURTELLI, A ;
ROHRBACH, F ;
ZICHICHI, A ;
CAPUTI, L ;
SUSINNO, G ;
BARBAGLI, G ;
CONFORTO, G ;
LANDI, G ;
PELFER, P ;
ANZIVINO, G ;
BIANCO, S ;
CASACCIA, R ;
CINDOLO, F ;
DEFELICE, M ;
DONG, Y ;
ENORINI, M ;
FABBRI, FL ;
JING, C ;
LAAKSO, I ;
QIAN, S ;
SHI, Z ;
SPALLONE, A ;
SUN, Y ;
VOTANO, L ;
ZALLO, A .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1989, 277 (01) :11-16