The incredible range of alpha decay half-lives can be modeled with quantum mechanical tunneling. The barrier faced by an alpha particle in POLONIUM-212, which emits an 8.78 MeV alpha particle with a half-life of 0.3 microseconds. The following characteristics of the nuclear environment can be calculated from a basic model of the nucleus: Separation of centers of alpha and nucleus at edge of barrier *9.1 fm* Height of barrier *26.4 MeV* Radius at which barrier drops to alpha energy *26.9 fm* Width of barrier seen by alpha *17.9 fm* Alpha's frequency of hitting the barrier *1.1 x 10^21/s* Details of calculation Different isotopes The shape of the barrier must obviously be taken into account since it drops rapidly. But it is instructive to calculate the half-life for a rectangular barrier of that height and width. Using the barrier penetration calculation gives a half-life of 1.5 x 10^7 seconds, about 13 orders of magnitude longer than the observed half-life. This gives some insight into the large range of alpha half-lives; the tunneling probability depends very strongly on the nature of the barrier. The probability depends exponentially on the height and width, and in this case the height is dropping like 1/r with distance from the nucleus.
Hey there! How are you doing!? Hope you're fine!? Now 2009 is almost over so here I send you a really cool vid about the HEROS of the year 2009!!! Check it out, really amazing! http://au.sevenload.com/videos/c5VrZN2-Dear-Hero?cp=se_91216_pHERO_AU_02 Well...I hope to hear from you soon. Come over and check out my page again;) All the best,<3 Bye bye!
Yoooo check this...I'm featured in XXL Magazine this month!! Wow and to be blessed to also be in The Source Magazine in December. Say what?! Yup, we've recently been interviewed by The Source as new up and coming artists and the exclusive interview is available now at www.thesource.com/2009/10/sihhn-j-rocka-saria-knowledge/ It's such an honor to have this opportunity....thanks to the hip hop community for your support! Now "Bump The Beat" and let conscious independent hip hop flow through you blastin loud through your speakers!
Hi Guys, Have a fantastic weekend,full of energy and armony. many ligth on your road,on your life,on your music. Vai com Deus,take care,keep loving. No music,No love,No life. Bernard from Geneva/Rio.
Hey how is life treatening you? I had a lot on my mind lately but now I'm back and I hope we can talk a bit. I got a nice clip for you and I hope you like it. It'd be nice if you could send me something too. cya http://bit.ly/41jg3F
COME OUT AND PARTY WITH ME!!! J RockA and Sarai Knowledge performing live! The must be at spot... definitely an event you won't wanna miss!!!
Friday, November 6, 2009 7pm-11pm City Hall, San Francisco "Where Hip Hop Meets Couture" A historical evening of high couture fashion show infused with hip-hop,live performances, and music/fashion professionals...
Meet in greets with the likes of Ed Hardy, The Source Magazine, Warner Bros., Interscope Records, and more...
$40 / $100 VIP includes admission to the official afterparty at Club 525 11:30pm - 2:30pm 525 Howard St., San Francisco
Limited presale tickets available online at airbornetickets.com Or if you're a local,tickets are available at Gussie's Chicken & Waffles 1521 Eddy St. in the heart of the historical Fillmore jazz district... Come down for some good ol' soul food!
Would love to see your beautiful faces :-) Hit me up if your going!! And if you're not in the SF area, check out show updates on my website at www.justbetrue.com for live events at a town near you!!!
Give thanks for your support xoxo Sending love and wishing you infinite abundance... Sarai
Hi Guys, Have a fantastic weekend,full of energy and armony. many ligth on your road,on your life,on your music. Vai com Deus,take care,keep loving. No music,No love,No life. Bernard from Geneva/Rio.
Soooo excited to share with you the new record about the drop, JUST BE The EP. I just posted the featured single "Bump The Beat" produced by 2009 Grammy winning producer for Lil Wayne's "Mr.Carter", Drew Correa. Track is fiyah!!! Check out my website at www.justbetrue.com to sample/buy the EP and for shows, photos, and updates.
Give thanks for your friendship and support and for letting conscious independent hip hop flow through you blastin loud through your speakers!
hi Guys, Hope everything it's ok with you and your life full of music,peace and energy. Take care,keep rocking. Dont forget in january my new CD on air No music,No life. Bernard from Geneva/Rio.
Though it is quite spoilt by the media HIPHOP will never stop! And if it's not your music, I've chosen HipHop music as a good example to illustrate mind control by the media...Please, check this new blog, it really worth it;-)
Bless Droppin by to pay de I some raspect. Always good to come here for some inspiration. Keep de fiyah burnin. Hope you have time to check out I new song called "No More Suffering". Any feedback is highly welcome. Load a raspect Senior-I
Hi Polonium 212, I keep searching for you between the cushions. The elves that play in the toasters wash their drum sticks in honey and sing strikingly colored anthems in perfect harmonious pleasure. Your eyes are like spheres of crystal water filled with shimmering dreams. Your essence is equal to the beauty of a galaxy. Your eyes show as many deep and full shades of fire as a volcano in heat. The skin I shed is a perfume that makes water bubbles so terribly clear to me. You have not yet reached the height of your creativity. Your eyes show as many deep and full shades of fire as a thousand supernovas. What wonderful vibrations you are capable of. Wood nymphs sprinkle your path with rose petals while you dance and prowl in the sequined moonlight with leftover cupcake sprinkles. Your intoxicating reflection can but incorporate freely into the powerful surface of a disintegrating mirror set afloat upon a swarm of locusts. May you be as vivid as your hallucinations. Cities crumble, skies ignite spontaneously in your presence.
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